diff options
Diffstat (limited to 'bfd/elf32-xtensa.c')
| -rw-r--r-- | bfd/elf32-xtensa.c | 10857 |
1 files changed, 10857 insertions, 0 deletions
diff --git a/bfd/elf32-xtensa.c b/bfd/elf32-xtensa.c new file mode 100644 index 0000000..e32496a --- /dev/null +++ b/bfd/elf32-xtensa.c @@ -0,0 +1,10857 @@ +/* Xtensa-specific support for 32-bit ELF. + Copyright (C) 2003-2014 Free Software Foundation, Inc. + + This file is part of BFD, the Binary File Descriptor library. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 3 of the + License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA + 02110-1301, USA. */ + +#include "sysdep.h" +#include "bfd.h" + +#include <stdarg.h> +#include <strings.h> + +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/xtensa.h" +#include "xtensa-isa.h" +#include "xtensa-config.h" + +#define XTENSA_NO_NOP_REMOVAL 0 + +/* Local helper functions. */ + +static bfd_boolean add_extra_plt_sections (struct bfd_link_info *, int); +static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4); +static bfd_reloc_status_type bfd_elf_xtensa_reloc + (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); +static bfd_boolean do_fix_for_relocatable_link + (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *); +static void do_fix_for_final_link + (Elf_Internal_Rela *, bfd *, asection *, bfd_byte *, bfd_vma *); + +/* Local functions to handle Xtensa configurability. */ + +static bfd_boolean is_indirect_call_opcode (xtensa_opcode); +static bfd_boolean is_direct_call_opcode (xtensa_opcode); +static bfd_boolean is_windowed_call_opcode (xtensa_opcode); +static xtensa_opcode get_const16_opcode (void); +static xtensa_opcode get_l32r_opcode (void); +static bfd_vma l32r_offset (bfd_vma, bfd_vma); +static int get_relocation_opnd (xtensa_opcode, int); +static int get_relocation_slot (int); +static xtensa_opcode get_relocation_opcode + (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *); +static bfd_boolean is_l32r_relocation + (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *); +static bfd_boolean is_alt_relocation (int); +static bfd_boolean is_operand_relocation (int); +static bfd_size_type insn_decode_len + (bfd_byte *, bfd_size_type, bfd_size_type); +static xtensa_opcode insn_decode_opcode + (bfd_byte *, bfd_size_type, bfd_size_type, int); +static bfd_boolean check_branch_target_aligned + (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma); +static bfd_boolean check_loop_aligned + (bfd_byte *, bfd_size_type, bfd_vma, bfd_vma); +static bfd_boolean check_branch_target_aligned_address (bfd_vma, int); +static bfd_size_type get_asm_simplify_size + (bfd_byte *, bfd_size_type, bfd_size_type); + +/* Functions for link-time code simplifications. */ + +static bfd_reloc_status_type elf_xtensa_do_asm_simplify + (bfd_byte *, bfd_vma, bfd_vma, char **); +static bfd_reloc_status_type contract_asm_expansion + (bfd_byte *, bfd_vma, Elf_Internal_Rela *, char **); +static xtensa_opcode swap_callx_for_call_opcode (xtensa_opcode); +static xtensa_opcode get_expanded_call_opcode (bfd_byte *, int, bfd_boolean *); + +/* Access to internal relocations, section contents and symbols. */ + +static Elf_Internal_Rela *retrieve_internal_relocs + (bfd *, asection *, bfd_boolean); +static void pin_internal_relocs (asection *, Elf_Internal_Rela *); +static void release_internal_relocs (asection *, Elf_Internal_Rela *); +static bfd_byte *retrieve_contents (bfd *, asection *, bfd_boolean); +static void pin_contents (asection *, bfd_byte *); +static void release_contents (asection *, bfd_byte *); +static Elf_Internal_Sym *retrieve_local_syms (bfd *); + +/* Miscellaneous utility functions. */ + +static asection *elf_xtensa_get_plt_section (struct bfd_link_info *, int); +static asection *elf_xtensa_get_gotplt_section (struct bfd_link_info *, int); +static asection *get_elf_r_symndx_section (bfd *, unsigned long); +static struct elf_link_hash_entry *get_elf_r_symndx_hash_entry + (bfd *, unsigned long); +static bfd_vma get_elf_r_symndx_offset (bfd *, unsigned long); +static bfd_boolean is_reloc_sym_weak (bfd *, Elf_Internal_Rela *); +static bfd_boolean pcrel_reloc_fits (xtensa_opcode, int, bfd_vma, bfd_vma); +static bfd_boolean xtensa_is_property_section (asection *); +static bfd_boolean xtensa_is_insntable_section (asection *); +static bfd_boolean xtensa_is_littable_section (asection *); +static bfd_boolean xtensa_is_proptable_section (asection *); +static int internal_reloc_compare (const void *, const void *); +static int internal_reloc_matches (const void *, const void *); +static asection *xtensa_get_property_section (asection *, const char *); +extern asection *xtensa_make_property_section (asection *, const char *); +static flagword xtensa_get_property_predef_flags (asection *); + +/* Other functions called directly by the linker. */ + +typedef void (*deps_callback_t) + (asection *, bfd_vma, asection *, bfd_vma, void *); +extern bfd_boolean xtensa_callback_required_dependence + (bfd *, asection *, struct bfd_link_info *, deps_callback_t, void *); + + +/* Globally visible flag for choosing size optimization of NOP removal + instead of branch-target-aware minimization for NOP removal. + When nonzero, narrow all instructions and remove all NOPs possible + around longcall expansions. */ + +int elf32xtensa_size_opt; + + +/* The "new_section_hook" is used to set up a per-section + "xtensa_relax_info" data structure with additional information used + during relaxation. */ + +typedef struct xtensa_relax_info_struct xtensa_relax_info; + + +/* The GNU tools do not easily allow extending interfaces to pass around + the pointer to the Xtensa ISA information, so instead we add a global + variable here (in BFD) that can be used by any of the tools that need + this information. */ + +xtensa_isa xtensa_default_isa; + + +/* When this is true, relocations may have been modified to refer to + symbols from other input files. The per-section list of "fix" + records needs to be checked when resolving relocations. */ + +static bfd_boolean relaxing_section = FALSE; + +/* When this is true, during final links, literals that cannot be + coalesced and their relocations may be moved to other sections. */ + +int elf32xtensa_no_literal_movement = 1; + +/* Rename one of the generic section flags to better document how it + is used here. */ +/* Whether relocations have been processed. */ +#define reloc_done sec_flg0 + +static reloc_howto_type elf_howto_table[] = +{ + HOWTO (R_XTENSA_NONE, 0, 0, 0, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_NONE", + FALSE, 0, 0, FALSE), + HOWTO (R_XTENSA_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_xtensa_reloc, "R_XTENSA_32", + TRUE, 0xffffffff, 0xffffffff, FALSE), + + /* Replace a 32-bit value with a value from the runtime linker (only + used by linker-generated stub functions). The r_addend value is + special: 1 means to substitute a pointer to the runtime linker's + dynamic resolver function; 2 means to substitute the link map for + the shared object. */ + HOWTO (R_XTENSA_RTLD, 0, 2, 32, FALSE, 0, complain_overflow_dont, + NULL, "R_XTENSA_RTLD", FALSE, 0, 0, FALSE), + + HOWTO (R_XTENSA_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_generic_reloc, "R_XTENSA_GLOB_DAT", + FALSE, 0, 0xffffffff, FALSE), + HOWTO (R_XTENSA_JMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_generic_reloc, "R_XTENSA_JMP_SLOT", + FALSE, 0, 0xffffffff, FALSE), + HOWTO (R_XTENSA_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_generic_reloc, "R_XTENSA_RELATIVE", + FALSE, 0, 0xffffffff, FALSE), + HOWTO (R_XTENSA_PLT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, + bfd_elf_xtensa_reloc, "R_XTENSA_PLT", + FALSE, 0, 0xffffffff, FALSE), + + EMPTY_HOWTO (7), + + /* Old relocations for backward compatibility. */ + HOWTO (R_XTENSA_OP0, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_OP0", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_OP1, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_OP1", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_OP2, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_OP2", FALSE, 0, 0, TRUE), + + /* Assembly auto-expansion. */ + HOWTO (R_XTENSA_ASM_EXPAND, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_ASM_EXPAND", FALSE, 0, 0, TRUE), + /* Relax assembly auto-expansion. */ + HOWTO (R_XTENSA_ASM_SIMPLIFY, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_ASM_SIMPLIFY", FALSE, 0, 0, TRUE), + + EMPTY_HOWTO (13), + + HOWTO (R_XTENSA_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_bitfield, + bfd_elf_xtensa_reloc, "R_XTENSA_32_PCREL", + FALSE, 0, 0xffffffff, TRUE), + + /* GNU extension to record C++ vtable hierarchy. */ + HOWTO (R_XTENSA_GNU_VTINHERIT, 0, 2, 0, FALSE, 0, complain_overflow_dont, + NULL, "R_XTENSA_GNU_VTINHERIT", + FALSE, 0, 0, FALSE), + /* GNU extension to record C++ vtable member usage. */ + HOWTO (R_XTENSA_GNU_VTENTRY, 0, 2, 0, FALSE, 0, complain_overflow_dont, + _bfd_elf_rel_vtable_reloc_fn, "R_XTENSA_GNU_VTENTRY", + FALSE, 0, 0, FALSE), + + /* Relocations for supporting difference of symbols. */ + HOWTO (R_XTENSA_DIFF8, 0, 0, 8, FALSE, 0, complain_overflow_signed, + bfd_elf_xtensa_reloc, "R_XTENSA_DIFF8", FALSE, 0, 0xff, FALSE), + HOWTO (R_XTENSA_DIFF16, 0, 1, 16, FALSE, 0, complain_overflow_signed, + bfd_elf_xtensa_reloc, "R_XTENSA_DIFF16", FALSE, 0, 0xffff, FALSE), + HOWTO (R_XTENSA_DIFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed, + bfd_elf_xtensa_reloc, "R_XTENSA_DIFF32", FALSE, 0, 0xffffffff, FALSE), + + /* General immediate operand relocations. */ + HOWTO (R_XTENSA_SLOT0_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT1_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT2_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT3_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT4_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT5_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT6_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT7_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT8_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT9_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT10_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT11_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT12_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT13_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_OP", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT14_OP, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_OP", FALSE, 0, 0, TRUE), + + /* "Alternate" relocations. The meaning of these is opcode-specific. */ + HOWTO (R_XTENSA_SLOT0_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT0_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT1_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT1_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT2_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT2_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT3_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT3_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT4_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT4_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT5_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT5_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT6_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT6_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT7_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT7_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT8_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT8_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT9_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT9_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT10_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT10_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT11_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT11_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT12_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT12_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT13_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT13_ALT", FALSE, 0, 0, TRUE), + HOWTO (R_XTENSA_SLOT14_ALT, 0, 0, 0, TRUE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_SLOT14_ALT", FALSE, 0, 0, TRUE), + + /* TLS relocations. */ + HOWTO (R_XTENSA_TLSDESC_FN, 0, 2, 32, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_TLSDESC_FN", + FALSE, 0, 0xffffffff, FALSE), + HOWTO (R_XTENSA_TLSDESC_ARG, 0, 2, 32, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_TLSDESC_ARG", + FALSE, 0, 0xffffffff, FALSE), + HOWTO (R_XTENSA_TLS_DTPOFF, 0, 2, 32, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_TLS_DTPOFF", + FALSE, 0, 0xffffffff, FALSE), + HOWTO (R_XTENSA_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_TLS_TPOFF", + FALSE, 0, 0xffffffff, FALSE), + HOWTO (R_XTENSA_TLS_FUNC, 0, 0, 0, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_TLS_FUNC", + FALSE, 0, 0, FALSE), + HOWTO (R_XTENSA_TLS_ARG, 0, 0, 0, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_TLS_ARG", + FALSE, 0, 0, FALSE), + HOWTO (R_XTENSA_TLS_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont, + bfd_elf_xtensa_reloc, "R_XTENSA_TLS_CALL", + FALSE, 0, 0, FALSE), +}; + +#if DEBUG_GEN_RELOC +#define TRACE(str) \ + fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str) +#else +#define TRACE(str) +#endif + +static reloc_howto_type * +elf_xtensa_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, + bfd_reloc_code_real_type code) +{ + switch (code) + { + case BFD_RELOC_NONE: + TRACE ("BFD_RELOC_NONE"); + return &elf_howto_table[(unsigned) R_XTENSA_NONE ]; + + case BFD_RELOC_32: + TRACE ("BFD_RELOC_32"); + return &elf_howto_table[(unsigned) R_XTENSA_32 ]; + + case BFD_RELOC_32_PCREL: + TRACE ("BFD_RELOC_32_PCREL"); + return &elf_howto_table[(unsigned) R_XTENSA_32_PCREL ]; + + case BFD_RELOC_XTENSA_DIFF8: + TRACE ("BFD_RELOC_XTENSA_DIFF8"); + return &elf_howto_table[(unsigned) R_XTENSA_DIFF8 ]; + + case BFD_RELOC_XTENSA_DIFF16: + TRACE ("BFD_RELOC_XTENSA_DIFF16"); + return &elf_howto_table[(unsigned) R_XTENSA_DIFF16 ]; + + case BFD_RELOC_XTENSA_DIFF32: + TRACE ("BFD_RELOC_XTENSA_DIFF32"); + return &elf_howto_table[(unsigned) R_XTENSA_DIFF32 ]; + + case BFD_RELOC_XTENSA_RTLD: + TRACE ("BFD_RELOC_XTENSA_RTLD"); + return &elf_howto_table[(unsigned) R_XTENSA_RTLD ]; + + case BFD_RELOC_XTENSA_GLOB_DAT: + TRACE ("BFD_RELOC_XTENSA_GLOB_DAT"); + return &elf_howto_table[(unsigned) R_XTENSA_GLOB_DAT ]; + + case BFD_RELOC_XTENSA_JMP_SLOT: + TRACE ("BFD_RELOC_XTENSA_JMP_SLOT"); + return &elf_howto_table[(unsigned) R_XTENSA_JMP_SLOT ]; + + case BFD_RELOC_XTENSA_RELATIVE: + TRACE ("BFD_RELOC_XTENSA_RELATIVE"); + return &elf_howto_table[(unsigned) R_XTENSA_RELATIVE ]; + + case BFD_RELOC_XTENSA_PLT: + TRACE ("BFD_RELOC_XTENSA_PLT"); + return &elf_howto_table[(unsigned) R_XTENSA_PLT ]; + + case BFD_RELOC_XTENSA_OP0: + TRACE ("BFD_RELOC_XTENSA_OP0"); + return &elf_howto_table[(unsigned) R_XTENSA_OP0 ]; + + case BFD_RELOC_XTENSA_OP1: + TRACE ("BFD_RELOC_XTENSA_OP1"); + return &elf_howto_table[(unsigned) R_XTENSA_OP1 ]; + + case BFD_RELOC_XTENSA_OP2: + TRACE ("BFD_RELOC_XTENSA_OP2"); + return &elf_howto_table[(unsigned) R_XTENSA_OP2 ]; + + case BFD_RELOC_XTENSA_ASM_EXPAND: + TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND"); + return &elf_howto_table[(unsigned) R_XTENSA_ASM_EXPAND ]; + + case BFD_RELOC_XTENSA_ASM_SIMPLIFY: + TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY"); + return &elf_howto_table[(unsigned) R_XTENSA_ASM_SIMPLIFY ]; + + case BFD_RELOC_VTABLE_INHERIT: + TRACE ("BFD_RELOC_VTABLE_INHERIT"); + return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTINHERIT ]; + + case BFD_RELOC_VTABLE_ENTRY: + TRACE ("BFD_RELOC_VTABLE_ENTRY"); + return &elf_howto_table[(unsigned) R_XTENSA_GNU_VTENTRY ]; + + case BFD_RELOC_XTENSA_TLSDESC_FN: + TRACE ("BFD_RELOC_XTENSA_TLSDESC_FN"); + return &elf_howto_table[(unsigned) R_XTENSA_TLSDESC_FN ]; + + case BFD_RELOC_XTENSA_TLSDESC_ARG: + TRACE ("BFD_RELOC_XTENSA_TLSDESC_ARG"); + return &elf_howto_table[(unsigned) R_XTENSA_TLSDESC_ARG ]; + + case BFD_RELOC_XTENSA_TLS_DTPOFF: + TRACE ("BFD_RELOC_XTENSA_TLS_DTPOFF"); + return &elf_howto_table[(unsigned) R_XTENSA_TLS_DTPOFF ]; + + case BFD_RELOC_XTENSA_TLS_TPOFF: + TRACE ("BFD_RELOC_XTENSA_TLS_TPOFF"); + return &elf_howto_table[(unsigned) R_XTENSA_TLS_TPOFF ]; + + case BFD_RELOC_XTENSA_TLS_FUNC: + TRACE ("BFD_RELOC_XTENSA_TLS_FUNC"); + return &elf_howto_table[(unsigned) R_XTENSA_TLS_FUNC ]; + + case BFD_RELOC_XTENSA_TLS_ARG: + TRACE ("BFD_RELOC_XTENSA_TLS_ARG"); + return &elf_howto_table[(unsigned) R_XTENSA_TLS_ARG ]; + + case BFD_RELOC_XTENSA_TLS_CALL: + TRACE ("BFD_RELOC_XTENSA_TLS_CALL"); + return &elf_howto_table[(unsigned) R_XTENSA_TLS_CALL ]; + + default: + if (code >= BFD_RELOC_XTENSA_SLOT0_OP + && code <= BFD_RELOC_XTENSA_SLOT14_OP) + { + unsigned n = (R_XTENSA_SLOT0_OP + + (code - BFD_RELOC_XTENSA_SLOT0_OP)); + return &elf_howto_table[n]; + } + + if (code >= BFD_RELOC_XTENSA_SLOT0_ALT + && code <= BFD_RELOC_XTENSA_SLOT14_ALT) + { + unsigned n = (R_XTENSA_SLOT0_ALT + + (code - BFD_RELOC_XTENSA_SLOT0_ALT)); + return &elf_howto_table[n]; + } + + break; + } + + TRACE ("Unknown"); + return NULL; +} + +static reloc_howto_type * +elf_xtensa_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) + if (elf_howto_table[i].name != NULL + && strcasecmp (elf_howto_table[i].name, r_name) == 0) + return &elf_howto_table[i]; + + return NULL; +} + + +/* Given an ELF "rela" relocation, find the corresponding howto and record + it in the BFD internal arelent representation of the relocation. */ + +static void +elf_xtensa_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, + arelent *cache_ptr, + Elf_Internal_Rela *dst) +{ + unsigned int r_type = ELF32_R_TYPE (dst->r_info); + + BFD_ASSERT (r_type < (unsigned int) R_XTENSA_max); + cache_ptr->howto = &elf_howto_table[r_type]; +} + + +/* Functions for the Xtensa ELF linker. */ + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so" + +/* The size in bytes of an entry in the procedure linkage table. + (This does _not_ include the space for the literals associated with + the PLT entry.) */ + +#define PLT_ENTRY_SIZE 16 + +/* For _really_ large PLTs, we may need to alternate between literals + and code to keep the literals within the 256K range of the L32R + instructions in the code. It's unlikely that anyone would ever need + such a big PLT, but an arbitrary limit on the PLT size would be bad. + Thus, we split the PLT into chunks. Since there's very little + overhead (2 extra literals) for each chunk, the chunk size is kept + small so that the code for handling multiple chunks get used and + tested regularly. With 254 entries, there are 1K of literals for + each chunk, and that seems like a nice round number. */ + +#define PLT_ENTRIES_PER_CHUNK 254 + +/* PLT entries are actually used as stub functions for lazy symbol + resolution. Once the symbol is resolved, the stub function is never + invoked. Note: the 32-byte frame size used here cannot be changed + without a corresponding change in the runtime linker. */ + +static const bfd_byte elf_xtensa_be_plt_entry[PLT_ENTRY_SIZE] = +{ + 0x6c, 0x10, 0x04, /* entry sp, 32 */ + 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */ + 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */ + 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */ + 0x0a, 0x80, 0x00, /* jx a8 */ + 0 /* unused */ +}; + +static const bfd_byte elf_xtensa_le_plt_entry[PLT_ENTRY_SIZE] = +{ + 0x36, 0x41, 0x00, /* entry sp, 32 */ + 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */ + 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */ + 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */ + 0xa0, 0x08, 0x00, /* jx a8 */ + 0 /* unused */ +}; + +/* The size of the thread control block. */ +#define TCB_SIZE 8 + +struct elf_xtensa_link_hash_entry +{ + struct elf_link_hash_entry elf; + + bfd_signed_vma tlsfunc_refcount; + +#define GOT_UNKNOWN 0 +#define GOT_NORMAL 1 +#define GOT_TLS_GD 2 /* global or local dynamic */ +#define GOT_TLS_IE 4 /* initial or local exec */ +#define GOT_TLS_ANY (GOT_TLS_GD | GOT_TLS_IE) + unsigned char tls_type; +}; + +#define elf_xtensa_hash_entry(ent) ((struct elf_xtensa_link_hash_entry *)(ent)) + +struct elf_xtensa_obj_tdata +{ + struct elf_obj_tdata root; + + /* tls_type for each local got entry. */ + char *local_got_tls_type; + + bfd_signed_vma *local_tlsfunc_refcounts; +}; + +#define elf_xtensa_tdata(abfd) \ + ((struct elf_xtensa_obj_tdata *) (abfd)->tdata.any) + +#define elf_xtensa_local_got_tls_type(abfd) \ + (elf_xtensa_tdata (abfd)->local_got_tls_type) + +#define elf_xtensa_local_tlsfunc_refcounts(abfd) \ + (elf_xtensa_tdata (abfd)->local_tlsfunc_refcounts) + +#define is_xtensa_elf(bfd) \ + (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ + && elf_tdata (bfd) != NULL \ + && elf_object_id (bfd) == XTENSA_ELF_DATA) + +static bfd_boolean +elf_xtensa_mkobject (bfd *abfd) +{ + return bfd_elf_allocate_object (abfd, sizeof (struct elf_xtensa_obj_tdata), + XTENSA_ELF_DATA); +} + +/* Xtensa ELF linker hash table. */ + +struct elf_xtensa_link_hash_table +{ + struct elf_link_hash_table elf; + + /* Short-cuts to get to dynamic linker sections. */ + asection *sgot; + asection *sgotplt; + asection *srelgot; + asection *splt; + asection *srelplt; + asection *sgotloc; + asection *spltlittbl; + + /* Total count of PLT relocations seen during check_relocs. + The actual PLT code must be split into multiple sections and all + the sections have to be created before size_dynamic_sections, + where we figure out the exact number of PLT entries that will be + needed. It is OK if this count is an overestimate, e.g., some + relocations may be removed by GC. */ + int plt_reloc_count; + + struct elf_xtensa_link_hash_entry *tlsbase; +}; + +/* Get the Xtensa ELF linker hash table from a link_info structure. */ + +#define elf_xtensa_hash_table(p) \ + (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \ + == XTENSA_ELF_DATA ? ((struct elf_xtensa_link_hash_table *) ((p)->hash)) : NULL) + +/* Create an entry in an Xtensa ELF linker hash table. */ + +static struct bfd_hash_entry * +elf_xtensa_link_hash_newfunc (struct bfd_hash_entry *entry, + struct bfd_hash_table *table, + const char *string) +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, + sizeof (struct elf_xtensa_link_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = _bfd_elf_link_hash_newfunc (entry, table, string); + if (entry != NULL) + { + struct elf_xtensa_link_hash_entry *eh = elf_xtensa_hash_entry (entry); + eh->tlsfunc_refcount = 0; + eh->tls_type = GOT_UNKNOWN; + } + + return entry; +} + +/* Create an Xtensa ELF linker hash table. */ + +static struct bfd_link_hash_table * +elf_xtensa_link_hash_table_create (bfd *abfd) +{ + struct elf_link_hash_entry *tlsbase; + struct elf_xtensa_link_hash_table *ret; + bfd_size_type amt = sizeof (struct elf_xtensa_link_hash_table); + + ret = bfd_zmalloc (amt); + if (ret == NULL) + return NULL; + + if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, + elf_xtensa_link_hash_newfunc, + sizeof (struct elf_xtensa_link_hash_entry), + XTENSA_ELF_DATA)) + { + free (ret); + return NULL; + } + + /* Create a hash entry for "_TLS_MODULE_BASE_" to speed up checking + for it later. */ + tlsbase = elf_link_hash_lookup (&ret->elf, "_TLS_MODULE_BASE_", + TRUE, FALSE, FALSE); + tlsbase->root.type = bfd_link_hash_new; + tlsbase->root.u.undef.abfd = NULL; + tlsbase->non_elf = 0; + ret->tlsbase = elf_xtensa_hash_entry (tlsbase); + ret->tlsbase->tls_type = GOT_UNKNOWN; + + return &ret->elf.root; +} + +/* Copy the extra info we tack onto an elf_link_hash_entry. */ + +static void +elf_xtensa_copy_indirect_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *dir, + struct elf_link_hash_entry *ind) +{ + struct elf_xtensa_link_hash_entry *edir, *eind; + + edir = elf_xtensa_hash_entry (dir); + eind = elf_xtensa_hash_entry (ind); + + if (ind->root.type == bfd_link_hash_indirect) + { + edir->tlsfunc_refcount += eind->tlsfunc_refcount; + eind->tlsfunc_refcount = 0; + + if (dir->got.refcount <= 0) + { + edir->tls_type = eind->tls_type; + eind->tls_type = GOT_UNKNOWN; + } + } + + _bfd_elf_link_hash_copy_indirect (info, dir, ind); +} + +static inline bfd_boolean +elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry *h, + struct bfd_link_info *info) +{ + /* Check if we should do dynamic things to this symbol. The + "ignore_protected" argument need not be set, because Xtensa code + does not require special handling of STV_PROTECTED to make function + pointer comparisons work properly. The PLT addresses are never + used for function pointers. */ + + return _bfd_elf_dynamic_symbol_p (h, info, 0); +} + + +static int +property_table_compare (const void *ap, const void *bp) +{ + const property_table_entry *a = (const property_table_entry *) ap; + const property_table_entry *b = (const property_table_entry *) bp; + + if (a->address == b->address) + { + if (a->size != b->size) + return (a->size - b->size); + + if ((a->flags & XTENSA_PROP_ALIGN) != (b->flags & XTENSA_PROP_ALIGN)) + return ((b->flags & XTENSA_PROP_ALIGN) + - (a->flags & XTENSA_PROP_ALIGN)); + + if ((a->flags & XTENSA_PROP_ALIGN) + && (GET_XTENSA_PROP_ALIGNMENT (a->flags) + != GET_XTENSA_PROP_ALIGNMENT (b->flags))) + return (GET_XTENSA_PROP_ALIGNMENT (a->flags) + - GET_XTENSA_PROP_ALIGNMENT (b->flags)); + + if ((a->flags & XTENSA_PROP_UNREACHABLE) + != (b->flags & XTENSA_PROP_UNREACHABLE)) + return ((b->flags & XTENSA_PROP_UNREACHABLE) + - (a->flags & XTENSA_PROP_UNREACHABLE)); + + return (a->flags - b->flags); + } + + return (a->address - b->address); +} + + +static int +property_table_matches (const void *ap, const void *bp) +{ + const property_table_entry *a = (const property_table_entry *) ap; + const property_table_entry *b = (const property_table_entry *) bp; + + /* Check if one entry overlaps with the other. */ + if ((b->address >= a->address && b->address < (a->address + a->size)) + || (a->address >= b->address && a->address < (b->address + b->size))) + return 0; + + return (a->address - b->address); +} + + +/* Get the literal table or property table entries for the given + section. Sets TABLE_P and returns the number of entries. On + error, returns a negative value. */ + +static int +xtensa_read_table_entries (bfd *abfd, + asection *section, + property_table_entry **table_p, + const char *sec_name, + bfd_boolean output_addr) +{ + asection *table_section; + bfd_size_type table_size = 0; + bfd_byte *table_data; + property_table_entry *blocks; + int blk, block_count; + bfd_size_type num_records; + Elf_Internal_Rela *internal_relocs, *irel, *rel_end; + bfd_vma section_addr, off; + flagword predef_flags; + bfd_size_type table_entry_size, section_limit; + + if (!section + || !(section->flags & SEC_ALLOC) + || (section->flags & SEC_DEBUGGING)) + { + *table_p = NULL; + return 0; + } + + table_section = xtensa_get_property_section (section, sec_name); + if (table_section) + table_size = table_section->size; + + if (table_size == 0) + { + *table_p = NULL; + return 0; + } + + predef_flags = xtensa_get_property_predef_flags (table_section); + table_entry_size = 12; + if (predef_flags) + table_entry_size -= 4; + + num_records = table_size / table_entry_size; + table_data = retrieve_contents (abfd, table_section, TRUE); + blocks = (property_table_entry *) + bfd_malloc (num_records * sizeof (property_table_entry)); + block_count = 0; + + if (output_addr) + section_addr = section->output_section->vma + section->output_offset; + else + section_addr = section->vma; + + internal_relocs = retrieve_internal_relocs (abfd, table_section, TRUE); + if (internal_relocs && !table_section->reloc_done) + { + qsort (internal_relocs, table_section->reloc_count, + sizeof (Elf_Internal_Rela), internal_reloc_compare); + irel = internal_relocs; + } + else + irel = NULL; + + section_limit = bfd_get_section_limit (abfd, section); + rel_end = internal_relocs + table_section->reloc_count; + + for (off = 0; off < table_size; off += table_entry_size) + { + bfd_vma address = bfd_get_32 (abfd, table_data + off); + + /* Skip any relocations before the current offset. This should help + avoid confusion caused by unexpected relocations for the preceding + table entry. */ + while (irel && + (irel->r_offset < off + || (irel->r_offset == off + && ELF32_R_TYPE (irel->r_info) == R_XTENSA_NONE))) + { + irel += 1; + if (irel >= rel_end) + irel = 0; + } + + if (irel && irel->r_offset == off) + { + bfd_vma sym_off; + unsigned long r_symndx = ELF32_R_SYM (irel->r_info); + BFD_ASSERT (ELF32_R_TYPE (irel->r_info) == R_XTENSA_32); + + if (get_elf_r_symndx_section (abfd, r_symndx) != section) + continue; + + sym_off = get_elf_r_symndx_offset (abfd, r_symndx); + BFD_ASSERT (sym_off == 0); + address += (section_addr + sym_off + irel->r_addend); + } + else + { + if (address < section_addr + || address >= section_addr + section_limit) + continue; + } + + blocks[block_count].address = address; + blocks[block_count].size = bfd_get_32 (abfd, table_data + off + 4); + if (predef_flags) + blocks[block_count].flags = predef_flags; + else + blocks[block_count].flags = bfd_get_32 (abfd, table_data + off + 8); + block_count++; + } + + release_contents (table_section, table_data); + release_internal_relocs (table_section, internal_relocs); + + if (block_count > 0) + { + /* Now sort them into address order for easy reference. */ + qsort (blocks, block_count, sizeof (property_table_entry), + property_table_compare); + + /* Check that the table contents are valid. Problems may occur, + for example, if an unrelocated object file is stripped. */ + for (blk = 1; blk < block_count; blk++) + { + /* The only circumstance where two entries may legitimately + have the same address is when one of them is a zero-size + placeholder to mark a place where fill can be inserted. + The zero-size entry should come first. */ + if (blocks[blk - 1].address == blocks[blk].address && + blocks[blk - 1].size != 0) + { + (*_bfd_error_handler) (_("%B(%A): invalid property table"), + abfd, section); + bfd_set_error (bfd_error_bad_value); + free (blocks); + return -1; + } + } + } + + *table_p = blocks; + return block_count; +} + + +static property_table_entry * +elf_xtensa_find_property_entry (property_table_entry *property_table, + int property_table_size, + bfd_vma addr) +{ + property_table_entry entry; + property_table_entry *rv; + + if (property_table_size == 0) + return NULL; + + entry.address = addr; + entry.size = 1; + entry.flags = 0; + + rv = bsearch (&entry, property_table, property_table_size, + sizeof (property_table_entry), property_table_matches); + return rv; +} + + +static bfd_boolean +elf_xtensa_in_literal_pool (property_table_entry *lit_table, + int lit_table_size, + bfd_vma addr) +{ + if (elf_xtensa_find_property_entry (lit_table, lit_table_size, addr)) + return TRUE; + + return FALSE; +} + + +/* Look through the relocs for a section during the first phase, and + calculate needed space in the dynamic reloc sections. */ + +static bfd_boolean +elf_xtensa_check_relocs (bfd *abfd, + struct bfd_link_info *info, + asection *sec, + const Elf_Internal_Rela *relocs) +{ + struct elf_xtensa_link_hash_table *htab; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + + if (info->relocatable || (sec->flags & SEC_ALLOC) == 0) + return TRUE; + + BFD_ASSERT (is_xtensa_elf (abfd)); + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + unsigned int r_type; + unsigned long r_symndx; + struct elf_link_hash_entry *h = NULL; + struct elf_xtensa_link_hash_entry *eh; + int tls_type, old_tls_type; + bfd_boolean is_got = FALSE; + bfd_boolean is_plt = FALSE; + bfd_boolean is_tlsfunc = FALSE; + + r_symndx = ELF32_R_SYM (rel->r_info); + r_type = ELF32_R_TYPE (rel->r_info); + + if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) + { + (*_bfd_error_handler) (_("%B: bad symbol index: %d"), + abfd, r_symndx); + return FALSE; + } + + if (r_symndx >= symtab_hdr->sh_info) + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + /* PR15323, ref flags aren't set for references in the same + object. */ + h->root.non_ir_ref = 1; + } + eh = elf_xtensa_hash_entry (h); + + switch (r_type) + { + case R_XTENSA_TLSDESC_FN: + if (info->shared) + { + tls_type = GOT_TLS_GD; + is_got = TRUE; + is_tlsfunc = TRUE; + } + else + tls_type = GOT_TLS_IE; + break; + + case R_XTENSA_TLSDESC_ARG: + if (info->shared) + { + tls_type = GOT_TLS_GD; + is_got = TRUE; + } + else + { + tls_type = GOT_TLS_IE; + if (h && elf_xtensa_hash_entry (h) != htab->tlsbase) + is_got = TRUE; + } + break; + + case R_XTENSA_TLS_DTPOFF: + if (info->shared) + tls_type = GOT_TLS_GD; + else + tls_type = GOT_TLS_IE; + break; + + case R_XTENSA_TLS_TPOFF: + tls_type = GOT_TLS_IE; + if (info->shared) + info->flags |= DF_STATIC_TLS; + if (info->shared || h) + is_got = TRUE; + break; + + case R_XTENSA_32: + tls_type = GOT_NORMAL; + is_got = TRUE; + break; + + case R_XTENSA_PLT: + tls_type = GOT_NORMAL; + is_plt = TRUE; + break; + + case R_XTENSA_GNU_VTINHERIT: + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) + return FALSE; + continue; + + case R_XTENSA_GNU_VTENTRY: + /* This relocation describes which C++ vtable entries are actually + used. Record for later use during GC. */ + BFD_ASSERT (h != NULL); + if (h != NULL + && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return FALSE; + continue; + + default: + /* Nothing to do for any other relocations. */ + continue; + } + + if (h) + { + if (is_plt) + { + if (h->plt.refcount <= 0) + { + h->needs_plt = 1; + h->plt.refcount = 1; + } + else + h->plt.refcount += 1; + + /* Keep track of the total PLT relocation count even if we + don't yet know whether the dynamic sections will be + created. */ + htab->plt_reloc_count += 1; + + if (elf_hash_table (info)->dynamic_sections_created) + { + if (! add_extra_plt_sections (info, htab->plt_reloc_count)) + return FALSE; + } + } + else if (is_got) + { + if (h->got.refcount <= 0) + h->got.refcount = 1; + else + h->got.refcount += 1; + } + + if (is_tlsfunc) + eh->tlsfunc_refcount += 1; + + old_tls_type = eh->tls_type; + } + else + { + /* Allocate storage the first time. */ + if (elf_local_got_refcounts (abfd) == NULL) + { + bfd_size_type size = symtab_hdr->sh_info; + void *mem; + + mem = bfd_zalloc (abfd, size * sizeof (bfd_signed_vma)); + if (mem == NULL) + return FALSE; + elf_local_got_refcounts (abfd) = (bfd_signed_vma *) mem; + + mem = bfd_zalloc (abfd, size); + if (mem == NULL) + return FALSE; + elf_xtensa_local_got_tls_type (abfd) = (char *) mem; + + mem = bfd_zalloc (abfd, size * sizeof (bfd_signed_vma)); + if (mem == NULL) + return FALSE; + elf_xtensa_local_tlsfunc_refcounts (abfd) + = (bfd_signed_vma *) mem; + } + + /* This is a global offset table entry for a local symbol. */ + if (is_got || is_plt) + elf_local_got_refcounts (abfd) [r_symndx] += 1; + + if (is_tlsfunc) + elf_xtensa_local_tlsfunc_refcounts (abfd) [r_symndx] += 1; + + old_tls_type = elf_xtensa_local_got_tls_type (abfd) [r_symndx]; + } + + if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE)) + tls_type |= old_tls_type; + /* If a TLS symbol is accessed using IE at least once, + there is no point to use a dynamic model for it. */ + else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN + && ((old_tls_type & GOT_TLS_GD) == 0 + || (tls_type & GOT_TLS_IE) == 0)) + { + if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_GD)) + tls_type = old_tls_type; + else if ((old_tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_GD)) + tls_type |= old_tls_type; + else + { + (*_bfd_error_handler) + (_("%B: `%s' accessed both as normal and thread local symbol"), + abfd, + h ? h->root.root.string : "<local>"); + return FALSE; + } + } + + if (old_tls_type != tls_type) + { + if (eh) + eh->tls_type = tls_type; + else + elf_xtensa_local_got_tls_type (abfd) [r_symndx] = tls_type; + } + } + + return TRUE; +} + + +static void +elf_xtensa_make_sym_local (struct bfd_link_info *info, + struct elf_link_hash_entry *h) +{ + if (info->shared) + { + if (h->plt.refcount > 0) + { + /* For shared objects, there's no need for PLT entries for local + symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */ + if (h->got.refcount < 0) + h->got.refcount = 0; + h->got.refcount += h->plt.refcount; + h->plt.refcount = 0; + } + } + else + { + /* Don't need any dynamic relocations at all. */ + h->plt.refcount = 0; + h->got.refcount = 0; + } +} + + +static void +elf_xtensa_hide_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *h, + bfd_boolean force_local) +{ + /* For a shared link, move the plt refcount to the got refcount to leave + space for RELATIVE relocs. */ + elf_xtensa_make_sym_local (info, h); + + _bfd_elf_link_hash_hide_symbol (info, h, force_local); +} + + +/* Return the section that should be marked against GC for a given + relocation. */ + +static asection * +elf_xtensa_gc_mark_hook (asection *sec, + struct bfd_link_info *info, + Elf_Internal_Rela *rel, + struct elf_link_hash_entry *h, + Elf_Internal_Sym *sym) +{ + /* Property sections are marked "KEEP" in the linker scripts, but they + should not cause other sections to be marked. (This approach relies + on elf_xtensa_discard_info to remove property table entries that + describe discarded sections. Alternatively, it might be more + efficient to avoid using "KEEP" in the linker scripts and instead use + the gc_mark_extra_sections hook to mark only the property sections + that describe marked sections. That alternative does not work well + with the current property table sections, which do not correspond + one-to-one with the sections they describe, but that should be fixed + someday.) */ + if (xtensa_is_property_section (sec)) + return NULL; + + if (h != NULL) + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_XTENSA_GNU_VTINHERIT: + case R_XTENSA_GNU_VTENTRY: + return NULL; + } + + return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); +} + + +/* Update the GOT & PLT entry reference counts + for the section being removed. */ + +static bfd_boolean +elf_xtensa_gc_sweep_hook (bfd *abfd, + struct bfd_link_info *info, + asection *sec, + const Elf_Internal_Rela *relocs) +{ + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel, *relend; + struct elf_xtensa_link_hash_table *htab; + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + if (info->relocatable) + return TRUE; + + if ((sec->flags & SEC_ALLOC) == 0) + return TRUE; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + relend = relocs + sec->reloc_count; + for (rel = relocs; rel < relend; rel++) + { + unsigned long r_symndx; + unsigned int r_type; + struct elf_link_hash_entry *h = NULL; + struct elf_xtensa_link_hash_entry *eh; + bfd_boolean is_got = FALSE; + bfd_boolean is_plt = FALSE; + bfd_boolean is_tlsfunc = FALSE; + + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + } + eh = elf_xtensa_hash_entry (h); + + r_type = ELF32_R_TYPE (rel->r_info); + switch (r_type) + { + case R_XTENSA_TLSDESC_FN: + if (info->shared) + { + is_got = TRUE; + is_tlsfunc = TRUE; + } + break; + + case R_XTENSA_TLSDESC_ARG: + if (info->shared) + is_got = TRUE; + else + { + if (h && elf_xtensa_hash_entry (h) != htab->tlsbase) + is_got = TRUE; + } + break; + + case R_XTENSA_TLS_TPOFF: + if (info->shared || h) + is_got = TRUE; + break; + + case R_XTENSA_32: + is_got = TRUE; + break; + + case R_XTENSA_PLT: + is_plt = TRUE; + break; + + default: + continue; + } + + if (h) + { + if (is_plt) + { + if (h->plt.refcount > 0) + h->plt.refcount--; + } + else if (is_got) + { + if (h->got.refcount > 0) + h->got.refcount--; + } + if (is_tlsfunc) + { + if (eh->tlsfunc_refcount > 0) + eh->tlsfunc_refcount--; + } + } + else + { + if (is_got || is_plt) + { + bfd_signed_vma *got_refcount + = &elf_local_got_refcounts (abfd) [r_symndx]; + if (*got_refcount > 0) + *got_refcount -= 1; + } + if (is_tlsfunc) + { + bfd_signed_vma *tlsfunc_refcount + = &elf_xtensa_local_tlsfunc_refcounts (abfd) [r_symndx]; + if (*tlsfunc_refcount > 0) + *tlsfunc_refcount -= 1; + } + } + } + + return TRUE; +} + + +/* Create all the dynamic sections. */ + +static bfd_boolean +elf_xtensa_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) +{ + struct elf_xtensa_link_hash_table *htab; + flagword flags, noalloc_flags; + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + /* First do all the standard stuff. */ + if (! _bfd_elf_create_dynamic_sections (dynobj, info)) + return FALSE; + htab->splt = bfd_get_linker_section (dynobj, ".plt"); + htab->srelplt = bfd_get_linker_section (dynobj, ".rela.plt"); + htab->sgot = bfd_get_linker_section (dynobj, ".got"); + htab->sgotplt = bfd_get_linker_section (dynobj, ".got.plt"); + htab->srelgot = bfd_get_linker_section (dynobj, ".rela.got"); + + /* Create any extra PLT sections in case check_relocs has already + been called on all the non-dynamic input files. */ + if (! add_extra_plt_sections (info, htab->plt_reloc_count)) + return FALSE; + + noalloc_flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED | SEC_READONLY); + flags = noalloc_flags | SEC_ALLOC | SEC_LOAD; + + /* Mark the ".got.plt" section READONLY. */ + if (htab->sgotplt == NULL + || ! bfd_set_section_flags (dynobj, htab->sgotplt, flags)) + return FALSE; + + /* Create ".got.loc" (literal tables for use by dynamic linker). */ + htab->sgotloc = bfd_make_section_anyway_with_flags (dynobj, ".got.loc", + flags); + if (htab->sgotloc == NULL + || ! bfd_set_section_alignment (dynobj, htab->sgotloc, 2)) + return FALSE; + + /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */ + htab->spltlittbl = bfd_make_section_anyway_with_flags (dynobj, ".xt.lit.plt", + noalloc_flags); + if (htab->spltlittbl == NULL + || ! bfd_set_section_alignment (dynobj, htab->spltlittbl, 2)) + return FALSE; + + return TRUE; +} + + +static bfd_boolean +add_extra_plt_sections (struct bfd_link_info *info, int count) +{ + bfd *dynobj = elf_hash_table (info)->dynobj; + int chunk; + + /* Iterate over all chunks except 0 which uses the standard ".plt" and + ".got.plt" sections. */ + for (chunk = count / PLT_ENTRIES_PER_CHUNK; chunk > 0; chunk--) + { + char *sname; + flagword flags; + asection *s; + + /* Stop when we find a section has already been created. */ + if (elf_xtensa_get_plt_section (info, chunk)) + break; + + flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED | SEC_READONLY); + + sname = (char *) bfd_malloc (10); + sprintf (sname, ".plt.%u", chunk); + s = bfd_make_section_anyway_with_flags (dynobj, sname, flags | SEC_CODE); + if (s == NULL + || ! bfd_set_section_alignment (dynobj, s, 2)) + return FALSE; + + sname = (char *) bfd_malloc (14); + sprintf (sname, ".got.plt.%u", chunk); + s = bfd_make_section_anyway_with_flags (dynobj, sname, flags); + if (s == NULL + || ! bfd_set_section_alignment (dynobj, s, 2)) + return FALSE; + } + + return TRUE; +} + + +/* Adjust a symbol defined by a dynamic object and referenced by a + regular object. The current definition is in some section of the + dynamic object, but we're not including those sections. We have to + change the definition to something the rest of the link can + understand. */ + +static bfd_boolean +elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info *info ATTRIBUTE_UNUSED, + struct elf_link_hash_entry *h) +{ + /* If this is a weak symbol, and there is a real definition, the + processor independent code will have arranged for us to see the + real definition first, and we can just use the same value. */ + if (h->u.weakdef) + { + BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined + || h->u.weakdef->root.type == bfd_link_hash_defweak); + h->root.u.def.section = h->u.weakdef->root.u.def.section; + h->root.u.def.value = h->u.weakdef->root.u.def.value; + return TRUE; + } + + /* This is a reference to a symbol defined by a dynamic object. The + reference must go through the GOT, so there's no need for COPY relocs, + .dynbss, etc. */ + + return TRUE; +} + + +static bfd_boolean +elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry *h, void *arg) +{ + struct bfd_link_info *info; + struct elf_xtensa_link_hash_table *htab; + struct elf_xtensa_link_hash_entry *eh = elf_xtensa_hash_entry (h); + + if (h->root.type == bfd_link_hash_indirect) + return TRUE; + + info = (struct bfd_link_info *) arg; + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + /* If we saw any use of an IE model for this symbol, we can then optimize + away GOT entries for any TLSDESC_FN relocs. */ + if ((eh->tls_type & GOT_TLS_IE) != 0) + { + BFD_ASSERT (h->got.refcount >= eh->tlsfunc_refcount); + h->got.refcount -= eh->tlsfunc_refcount; + } + + if (! elf_xtensa_dynamic_symbol_p (h, info)) + elf_xtensa_make_sym_local (info, h); + + if (h->plt.refcount > 0) + htab->srelplt->size += (h->plt.refcount * sizeof (Elf32_External_Rela)); + + if (h->got.refcount > 0) + htab->srelgot->size += (h->got.refcount * sizeof (Elf32_External_Rela)); + + return TRUE; +} + + +static void +elf_xtensa_allocate_local_got_size (struct bfd_link_info *info) +{ + struct elf_xtensa_link_hash_table *htab; + bfd *i; + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return; + + for (i = info->input_bfds; i; i = i->link.next) + { + bfd_signed_vma *local_got_refcounts; + bfd_size_type j, cnt; + Elf_Internal_Shdr *symtab_hdr; + + local_got_refcounts = elf_local_got_refcounts (i); + if (!local_got_refcounts) + continue; + + symtab_hdr = &elf_tdata (i)->symtab_hdr; + cnt = symtab_hdr->sh_info; + + for (j = 0; j < cnt; ++j) + { + /* If we saw any use of an IE model for this symbol, we can + then optimize away GOT entries for any TLSDESC_FN relocs. */ + if ((elf_xtensa_local_got_tls_type (i) [j] & GOT_TLS_IE) != 0) + { + bfd_signed_vma *tlsfunc_refcount + = &elf_xtensa_local_tlsfunc_refcounts (i) [j]; + BFD_ASSERT (local_got_refcounts[j] >= *tlsfunc_refcount); + local_got_refcounts[j] -= *tlsfunc_refcount; + } + + if (local_got_refcounts[j] > 0) + htab->srelgot->size += (local_got_refcounts[j] + * sizeof (Elf32_External_Rela)); + } + } +} + + +/* Set the sizes of the dynamic sections. */ + +static bfd_boolean +elf_xtensa_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info) +{ + struct elf_xtensa_link_hash_table *htab; + bfd *dynobj, *abfd; + asection *s, *srelplt, *splt, *sgotplt, *srelgot, *spltlittbl, *sgotloc; + bfd_boolean relplt, relgot; + int plt_entries, plt_chunks, chunk; + + plt_entries = 0; + plt_chunks = 0; + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + dynobj = elf_hash_table (info)->dynobj; + if (dynobj == NULL) + abort (); + srelgot = htab->srelgot; + srelplt = htab->srelplt; + + if (elf_hash_table (info)->dynamic_sections_created) + { + BFD_ASSERT (htab->srelgot != NULL + && htab->srelplt != NULL + && htab->sgot != NULL + && htab->spltlittbl != NULL + && htab->sgotloc != NULL); + + /* Set the contents of the .interp section to the interpreter. */ + if (info->executable) + { + s = bfd_get_linker_section (dynobj, ".interp"); + if (s == NULL) + abort (); + s->size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + + /* Allocate room for one word in ".got". */ + htab->sgot->size = 4; + + /* Allocate space in ".rela.got" for literals that reference global + symbols and space in ".rela.plt" for literals that have PLT + entries. */ + elf_link_hash_traverse (elf_hash_table (info), + elf_xtensa_allocate_dynrelocs, + (void *) info); + + /* If we are generating a shared object, we also need space in + ".rela.got" for R_XTENSA_RELATIVE relocs for literals that + reference local symbols. */ + if (info->shared) + elf_xtensa_allocate_local_got_size (info); + + /* Allocate space in ".plt" to match the size of ".rela.plt". For + each PLT entry, we need the PLT code plus a 4-byte literal. + For each chunk of ".plt", we also need two more 4-byte + literals, two corresponding entries in ".rela.got", and an + 8-byte entry in ".xt.lit.plt". */ + spltlittbl = htab->spltlittbl; + plt_entries = srelplt->size / sizeof (Elf32_External_Rela); + plt_chunks = + (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK; + + /* Iterate over all the PLT chunks, including any extra sections + created earlier because the initial count of PLT relocations + was an overestimate. */ + for (chunk = 0; + (splt = elf_xtensa_get_plt_section (info, chunk)) != NULL; + chunk++) + { + int chunk_entries; + + sgotplt = elf_xtensa_get_gotplt_section (info, chunk); + BFD_ASSERT (sgotplt != NULL); + + if (chunk < plt_chunks - 1) + chunk_entries = PLT_ENTRIES_PER_CHUNK; + else if (chunk == plt_chunks - 1) + chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK); + else + chunk_entries = 0; + + if (chunk_entries != 0) + { + sgotplt->size = 4 * (chunk_entries + 2); + splt->size = PLT_ENTRY_SIZE * chunk_entries; + srelgot->size += 2 * sizeof (Elf32_External_Rela); + spltlittbl->size += 8; + } + else + { + sgotplt->size = 0; + splt->size = 0; + } + } + + /* Allocate space in ".got.loc" to match the total size of all the + literal tables. */ + sgotloc = htab->sgotloc; + sgotloc->size = spltlittbl->size; + for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next) + { + if (abfd->flags & DYNAMIC) + continue; + for (s = abfd->sections; s != NULL; s = s->next) + { + if (! discarded_section (s) + && xtensa_is_littable_section (s) + && s != spltlittbl) + sgotloc->size += s->size; + } + } + } + + /* Allocate memory for dynamic sections. */ + relplt = FALSE; + relgot = FALSE; + for (s = dynobj->sections; s != NULL; s = s->next) + { + const char *name; + + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + /* It's OK to base decisions on the section name, because none + of the dynobj section names depend upon the input files. */ + name = bfd_get_section_name (dynobj, s); + + if (CONST_STRNEQ (name, ".rela")) + { + if (s->size != 0) + { + if (strcmp (name, ".rela.plt") == 0) + relplt = TRUE; + else if (strcmp (name, ".rela.got") == 0) + relgot = TRUE; + + /* We use the reloc_count field as a counter if we need + to copy relocs into the output file. */ + s->reloc_count = 0; + } + } + else if (! CONST_STRNEQ (name, ".plt.") + && ! CONST_STRNEQ (name, ".got.plt.") + && strcmp (name, ".got") != 0 + && strcmp (name, ".plt") != 0 + && strcmp (name, ".got.plt") != 0 + && strcmp (name, ".xt.lit.plt") != 0 + && strcmp (name, ".got.loc") != 0) + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + if (s->size == 0) + { + /* If we don't need this section, strip it from the output + file. We must create the ".plt*" and ".got.plt*" + sections in create_dynamic_sections and/or check_relocs + based on a conservative estimate of the PLT relocation + count, because the sections must be created before the + linker maps input sections to output sections. The + linker does that before size_dynamic_sections, where we + compute the exact size of the PLT, so there may be more + of these sections than are actually needed. */ + s->flags |= SEC_EXCLUDE; + } + else if ((s->flags & SEC_HAS_CONTENTS) != 0) + { + /* Allocate memory for the section contents. */ + s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size); + if (s->contents == NULL) + return FALSE; + } + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Add the special XTENSA_RTLD relocations now. The offsets won't be + known until finish_dynamic_sections, but we need to get the relocs + in place before they are sorted. */ + for (chunk = 0; chunk < plt_chunks; chunk++) + { + Elf_Internal_Rela irela; + bfd_byte *loc; + + irela.r_offset = 0; + irela.r_info = ELF32_R_INFO (0, R_XTENSA_RTLD); + irela.r_addend = 0; + + loc = (srelgot->contents + + srelgot->reloc_count * sizeof (Elf32_External_Rela)); + bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); + bfd_elf32_swap_reloca_out (output_bfd, &irela, + loc + sizeof (Elf32_External_Rela)); + srelgot->reloc_count += 2; + } + + /* Add some entries to the .dynamic section. We fill in the + values later, in elf_xtensa_finish_dynamic_sections, but we + must add the entries now so that we get the correct size for + the .dynamic section. The DT_DEBUG entry is filled in by the + dynamic linker and used by the debugger. */ +#define add_dynamic_entry(TAG, VAL) \ + _bfd_elf_add_dynamic_entry (info, TAG, VAL) + + if (info->executable) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return FALSE; + } + + if (relplt) + { + if (!add_dynamic_entry (DT_PLTRELSZ, 0) + || !add_dynamic_entry (DT_PLTREL, DT_RELA) + || !add_dynamic_entry (DT_JMPREL, 0)) + return FALSE; + } + + if (relgot) + { + if (!add_dynamic_entry (DT_RELA, 0) + || !add_dynamic_entry (DT_RELASZ, 0) + || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) + return FALSE; + } + + if (!add_dynamic_entry (DT_PLTGOT, 0) + || !add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF, 0) + || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ, 0)) + return FALSE; + } +#undef add_dynamic_entry + + return TRUE; +} + +static bfd_boolean +elf_xtensa_always_size_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + struct elf_xtensa_link_hash_table *htab; + asection *tls_sec; + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + tls_sec = htab->elf.tls_sec; + + if (tls_sec && (htab->tlsbase->tls_type & GOT_TLS_ANY) != 0) + { + struct elf_link_hash_entry *tlsbase = &htab->tlsbase->elf; + struct bfd_link_hash_entry *bh = &tlsbase->root; + const struct elf_backend_data *bed = get_elf_backend_data (output_bfd); + + tlsbase->type = STT_TLS; + if (!(_bfd_generic_link_add_one_symbol + (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL, + tls_sec, 0, NULL, FALSE, + bed->collect, &bh))) + return FALSE; + tlsbase->def_regular = 1; + tlsbase->other = STV_HIDDEN; + (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE); + } + + return TRUE; +} + + +/* Return the base VMA address which should be subtracted from real addresses + when resolving @dtpoff relocation. + This is PT_TLS segment p_vaddr. */ + +static bfd_vma +dtpoff_base (struct bfd_link_info *info) +{ + /* If tls_sec is NULL, we should have signalled an error already. */ + if (elf_hash_table (info)->tls_sec == NULL) + return 0; + return elf_hash_table (info)->tls_sec->vma; +} + +/* Return the relocation value for @tpoff relocation + if STT_TLS virtual address is ADDRESS. */ + +static bfd_vma +tpoff (struct bfd_link_info *info, bfd_vma address) +{ + struct elf_link_hash_table *htab = elf_hash_table (info); + bfd_vma base; + + /* If tls_sec is NULL, we should have signalled an error already. */ + if (htab->tls_sec == NULL) + return 0; + base = align_power ((bfd_vma) TCB_SIZE, htab->tls_sec->alignment_power); + return address - htab->tls_sec->vma + base; +} + +/* Perform the specified relocation. The instruction at (contents + address) + is modified to set one operand to represent the value in "relocation". The + operand position is determined by the relocation type recorded in the + howto. */ + +#define CALL_SEGMENT_BITS (30) +#define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS) + +static bfd_reloc_status_type +elf_xtensa_do_reloc (reloc_howto_type *howto, + bfd *abfd, + asection *input_section, + bfd_vma relocation, + bfd_byte *contents, + bfd_vma address, + bfd_boolean is_weak_undef, + char **error_message) +{ + xtensa_format fmt; + xtensa_opcode opcode; + xtensa_isa isa = xtensa_default_isa; + static xtensa_insnbuf ibuff = NULL; + static xtensa_insnbuf sbuff = NULL; + bfd_vma self_address; + bfd_size_type input_size; + int opnd, slot; + uint32 newval; + + if (!ibuff) + { + ibuff = xtensa_insnbuf_alloc (isa); + sbuff = xtensa_insnbuf_alloc (isa); + } + + input_size = bfd_get_section_limit (abfd, input_section); + + /* Calculate the PC address for this instruction. */ + self_address = (input_section->output_section->vma + + input_section->output_offset + + address); + + switch (howto->type) + { + case R_XTENSA_NONE: + case R_XTENSA_DIFF8: + case R_XTENSA_DIFF16: + case R_XTENSA_DIFF32: + case R_XTENSA_TLS_FUNC: + case R_XTENSA_TLS_ARG: + case R_XTENSA_TLS_CALL: + return bfd_reloc_ok; + + case R_XTENSA_ASM_EXPAND: + if (!is_weak_undef) + { + /* Check for windowed CALL across a 1GB boundary. */ + opcode = get_expanded_call_opcode (contents + address, + input_size - address, 0); + if (is_windowed_call_opcode (opcode)) + { + if ((self_address >> CALL_SEGMENT_BITS) + != (relocation >> CALL_SEGMENT_BITS)) + { + *error_message = "windowed longcall crosses 1GB boundary; " + "return may fail"; + return bfd_reloc_dangerous; + } + } + } + return bfd_reloc_ok; + + case R_XTENSA_ASM_SIMPLIFY: + { + /* Convert the L32R/CALLX to CALL. */ + bfd_reloc_status_type retval = + elf_xtensa_do_asm_simplify (contents, address, input_size, + error_message); + if (retval != bfd_reloc_ok) + return bfd_reloc_dangerous; + + /* The CALL needs to be relocated. Continue below for that part. */ + address += 3; + self_address += 3; + howto = &elf_howto_table[(unsigned) R_XTENSA_SLOT0_OP ]; + } + break; + + case R_XTENSA_32: + { + bfd_vma x; + x = bfd_get_32 (abfd, contents + address); + x = x + relocation; + bfd_put_32 (abfd, x, contents + address); + } + return bfd_reloc_ok; + + case R_XTENSA_32_PCREL: + bfd_put_32 (abfd, relocation - self_address, contents + address); + return bfd_reloc_ok; + + case R_XTENSA_PLT: + case R_XTENSA_TLSDESC_FN: + case R_XTENSA_TLSDESC_ARG: + case R_XTENSA_TLS_DTPOFF: + case R_XTENSA_TLS_TPOFF: + bfd_put_32 (abfd, relocation, contents + address); + return bfd_reloc_ok; + } + + /* Only instruction slot-specific relocations handled below.... */ + slot = get_relocation_slot (howto->type); + if (slot == XTENSA_UNDEFINED) + { + *error_message = "unexpected relocation"; + return bfd_reloc_dangerous; + } + + /* Read the instruction into a buffer and decode the opcode. */ + xtensa_insnbuf_from_chars (isa, ibuff, contents + address, + input_size - address); + fmt = xtensa_format_decode (isa, ibuff); + if (fmt == XTENSA_UNDEFINED) + { + *error_message = "cannot decode instruction format"; + return bfd_reloc_dangerous; + } + + xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff); + + opcode = xtensa_opcode_decode (isa, fmt, slot, sbuff); + if (opcode == XTENSA_UNDEFINED) + { + *error_message = "cannot decode instruction opcode"; + return bfd_reloc_dangerous; + } + + /* Check for opcode-specific "alternate" relocations. */ + if (is_alt_relocation (howto->type)) + { + if (opcode == get_l32r_opcode ()) + { + /* Handle the special-case of non-PC-relative L32R instructions. */ + bfd *output_bfd = input_section->output_section->owner; + asection *lit4_sec = bfd_get_section_by_name (output_bfd, ".lit4"); + if (!lit4_sec) + { + *error_message = "relocation references missing .lit4 section"; + return bfd_reloc_dangerous; + } + self_address = ((lit4_sec->vma & ~0xfff) + + 0x40000 - 3); /* -3 to compensate for do_reloc */ + newval = relocation; + opnd = 1; + } + else if (opcode == get_const16_opcode ()) + { + /* ALT used for high 16 bits. */ + newval = relocation >> 16; + opnd = 1; + } + else + { + /* No other "alternate" relocations currently defined. */ + *error_message = "unexpected relocation"; + return bfd_reloc_dangerous; + } + } + else /* Not an "alternate" relocation.... */ + { + if (opcode == get_const16_opcode ()) + { + newval = relocation & 0xffff; + opnd = 1; + } + else + { + /* ...normal PC-relative relocation.... */ + + /* Determine which operand is being relocated. */ + opnd = get_relocation_opnd (opcode, howto->type); + if (opnd == XTENSA_UNDEFINED) + { + *error_message = "unexpected relocation"; + return bfd_reloc_dangerous; + } + + if (!howto->pc_relative) + { + *error_message = "expected PC-relative relocation"; + return bfd_reloc_dangerous; + } + + newval = relocation; + } + } + + /* Apply the relocation. */ + if (xtensa_operand_do_reloc (isa, opcode, opnd, &newval, self_address) + || xtensa_operand_encode (isa, opcode, opnd, &newval) + || xtensa_operand_set_field (isa, opcode, opnd, fmt, slot, + sbuff, newval)) + { + const char *opname = xtensa_opcode_name (isa, opcode); + const char *msg; + + msg = "cannot encode"; + if (is_direct_call_opcode (opcode)) + { + if ((relocation & 0x3) != 0) + msg = "misaligned call target"; + else + msg = "call target out of range"; + } + else if (opcode == get_l32r_opcode ()) + { + if ((relocation & 0x3) != 0) + msg = "misaligned literal target"; + else if (is_alt_relocation (howto->type)) + msg = "literal target out of range (too many literals)"; + else if (self_address > relocation) + msg = "literal target out of range (try using text-section-literals)"; + else + msg = "literal placed after use"; + } + + *error_message = vsprint_msg (opname, ": %s", strlen (msg) + 2, msg); + return bfd_reloc_dangerous; + } + + /* Check for calls across 1GB boundaries. */ + if (is_direct_call_opcode (opcode) + && is_windowed_call_opcode (opcode)) + { + if ((self_address >> CALL_SEGMENT_BITS) + != (relocation >> CALL_SEGMENT_BITS)) + { + *error_message = + "windowed call crosses 1GB boundary; return may fail"; + return bfd_reloc_dangerous; + } + } + + /* Write the modified instruction back out of the buffer. */ + xtensa_format_set_slot (isa, fmt, slot, ibuff, sbuff); + xtensa_insnbuf_to_chars (isa, ibuff, contents + address, + input_size - address); + return bfd_reloc_ok; +} + + +static char * +vsprint_msg (const char *origmsg, const char *fmt, int arglen, ...) +{ + /* To reduce the size of the memory leak, + we only use a single message buffer. */ + static bfd_size_type alloc_size = 0; + static char *message = NULL; + bfd_size_type orig_len, len = 0; + bfd_boolean is_append; + va_list ap; + + va_start (ap, arglen); + + is_append = (origmsg == message); + + orig_len = strlen (origmsg); + len = orig_len + strlen (fmt) + arglen + 20; + if (len > alloc_size) + { + message = (char *) bfd_realloc_or_free (message, len); + alloc_size = len; + } + if (message != NULL) + { + if (!is_append) + memcpy (message, origmsg, orig_len); + vsprintf (message + orig_len, fmt, ap); + } + va_end (ap); + return message; +} + + +/* This function is registered as the "special_function" in the + Xtensa howto for handling simplify operations. + bfd_perform_relocation / bfd_install_relocation use it to + perform (install) the specified relocation. Since this replaces the code + in bfd_perform_relocation, it is basically an Xtensa-specific, + stripped-down version of bfd_perform_relocation. */ + +static bfd_reloc_status_type +bfd_elf_xtensa_reloc (bfd *abfd, + arelent *reloc_entry, + asymbol *symbol, + void *data, + asection *input_section, + bfd *output_bfd, + char **error_message) +{ + bfd_vma relocation; + bfd_reloc_status_type flag; + bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd); + bfd_vma output_base = 0; + reloc_howto_type *howto = reloc_entry->howto; + asection *reloc_target_output_section; + bfd_boolean is_weak_undef; + + if (!xtensa_default_isa) + xtensa_default_isa = xtensa_isa_init (0, 0); + + /* ELF relocs are against symbols. If we are producing relocatable + output, and the reloc is against an external symbol, the resulting + reloc will also be against the same symbol. In such a case, we + don't want to change anything about the way the reloc is handled, + since it will all be done at final link time. This test is similar + to what bfd_elf_generic_reloc does except that it lets relocs with + howto->partial_inplace go through even if the addend is non-zero. + (The real problem is that partial_inplace is set for XTENSA_32 + relocs to begin with, but that's a long story and there's little we + can do about it now....) */ + + if (output_bfd && (symbol->flags & BSF_SECTION_SYM) == 0) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + /* Is the address of the relocation really within the section? */ + if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) + return bfd_reloc_outofrange; + + /* Work out which section the relocation is targeted at and the + initial relocation command value. */ + + /* Get symbol value. (Common symbols are special.) */ + if (bfd_is_com_section (symbol->section)) + relocation = 0; + else + relocation = symbol->value; + + reloc_target_output_section = symbol->section->output_section; + + /* Convert input-section-relative symbol value to absolute. */ + if ((output_bfd && !howto->partial_inplace) + || reloc_target_output_section == NULL) + output_base = 0; + else + output_base = reloc_target_output_section->vma; + + relocation += output_base + symbol->section->output_offset; + + /* Add in supplied addend. */ + relocation += reloc_entry->addend; + + /* Here the variable relocation holds the final address of the + symbol we are relocating against, plus any addend. */ + if (output_bfd) + { + if (!howto->partial_inplace) + { + /* This is a partial relocation, and we want to apply the relocation + to the reloc entry rather than the raw data. Everything except + relocations against section symbols has already been handled + above. */ + + BFD_ASSERT (symbol->flags & BSF_SECTION_SYM); + reloc_entry->addend = relocation; + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + else + { + reloc_entry->address += input_section->output_offset; + reloc_entry->addend = 0; + } + } + + is_weak_undef = (bfd_is_und_section (symbol->section) + && (symbol->flags & BSF_WEAK) != 0); + flag = elf_xtensa_do_reloc (howto, abfd, input_section, relocation, + (bfd_byte *) data, (bfd_vma) octets, + is_weak_undef, error_message); + + if (flag == bfd_reloc_dangerous) + { + /* Add the symbol name to the error message. */ + if (! *error_message) + *error_message = ""; + *error_message = vsprint_msg (*error_message, ": (%s + 0x%lx)", + strlen (symbol->name) + 17, + symbol->name, + (unsigned long) reloc_entry->addend); + } + + return flag; +} + + +/* Set up an entry in the procedure linkage table. */ + +static bfd_vma +elf_xtensa_create_plt_entry (struct bfd_link_info *info, + bfd *output_bfd, + unsigned reloc_index) +{ + asection *splt, *sgotplt; + bfd_vma plt_base, got_base; + bfd_vma code_offset, lit_offset; + int chunk; + + chunk = reloc_index / PLT_ENTRIES_PER_CHUNK; + splt = elf_xtensa_get_plt_section (info, chunk); + sgotplt = elf_xtensa_get_gotplt_section (info, chunk); + BFD_ASSERT (splt != NULL && sgotplt != NULL); + + plt_base = splt->output_section->vma + splt->output_offset; + got_base = sgotplt->output_section->vma + sgotplt->output_offset; + + lit_offset = 8 + (reloc_index % PLT_ENTRIES_PER_CHUNK) * 4; + code_offset = (reloc_index % PLT_ENTRIES_PER_CHUNK) * PLT_ENTRY_SIZE; + + /* Fill in the literal entry. This is the offset of the dynamic + relocation entry. */ + bfd_put_32 (output_bfd, reloc_index * sizeof (Elf32_External_Rela), + sgotplt->contents + lit_offset); + + /* Fill in the entry in the procedure linkage table. */ + memcpy (splt->contents + code_offset, + (bfd_big_endian (output_bfd) + ? elf_xtensa_be_plt_entry + : elf_xtensa_le_plt_entry), + PLT_ENTRY_SIZE); + bfd_put_16 (output_bfd, l32r_offset (got_base + 0, + plt_base + code_offset + 3), + splt->contents + code_offset + 4); + bfd_put_16 (output_bfd, l32r_offset (got_base + 4, + plt_base + code_offset + 6), + splt->contents + code_offset + 7); + bfd_put_16 (output_bfd, l32r_offset (got_base + lit_offset, + plt_base + code_offset + 9), + splt->contents + code_offset + 10); + + return plt_base + code_offset; +} + + +static bfd_boolean get_indirect_call_dest_reg (xtensa_opcode, unsigned *); + +static bfd_boolean +replace_tls_insn (Elf_Internal_Rela *rel, + bfd *abfd, + asection *input_section, + bfd_byte *contents, + bfd_boolean is_ld_model, + char **error_message) +{ + static xtensa_insnbuf ibuff = NULL; + static xtensa_insnbuf sbuff = NULL; + xtensa_isa isa = xtensa_default_isa; + xtensa_format fmt; + xtensa_opcode old_op, new_op; + bfd_size_type input_size; + int r_type; + unsigned dest_reg, src_reg; + + if (ibuff == NULL) + { + ibuff = xtensa_insnbuf_alloc (isa); + sbuff = xtensa_insnbuf_alloc (isa); + } + + input_size = bfd_get_section_limit (abfd, input_section); + + /* Read the instruction into a buffer and decode the opcode. */ + xtensa_insnbuf_from_chars (isa, ibuff, contents + rel->r_offset, + input_size - rel->r_offset); + fmt = xtensa_format_decode (isa, ibuff); + if (fmt == XTENSA_UNDEFINED) + { + *error_message = "cannot decode instruction format"; + return FALSE; + } + + BFD_ASSERT (xtensa_format_num_slots (isa, fmt) == 1); + xtensa_format_get_slot (isa, fmt, 0, ibuff, sbuff); + + old_op = xtensa_opcode_decode (isa, fmt, 0, sbuff); + if (old_op == XTENSA_UNDEFINED) + { + *error_message = "cannot decode instruction opcode"; + return FALSE; + } + + r_type = ELF32_R_TYPE (rel->r_info); + switch (r_type) + { + case R_XTENSA_TLS_FUNC: + case R_XTENSA_TLS_ARG: + if (old_op != get_l32r_opcode () + || xtensa_operand_get_field (isa, old_op, 0, fmt, 0, + sbuff, &dest_reg) != 0) + { + *error_message = "cannot extract L32R destination for TLS access"; + return FALSE; + } + break; + + case R_XTENSA_TLS_CALL: + if (! get_indirect_call_dest_reg (old_op, &dest_reg) + || xtensa_operand_get_field (isa, old_op, 0, fmt, 0, + sbuff, &src_reg) != 0) + { + *error_message = "cannot extract CALLXn operands for TLS access"; + return FALSE; + } + break; + + default: + abort (); + } + + if (is_ld_model) + { + switch (r_type) + { + case R_XTENSA_TLS_FUNC: + case R_XTENSA_TLS_ARG: + /* Change the instruction to a NOP (or "OR a1, a1, a1" for older + versions of Xtensa). */ + new_op = xtensa_opcode_lookup (isa, "nop"); + if (new_op == XTENSA_UNDEFINED) + { + new_op = xtensa_opcode_lookup (isa, "or"); + if (new_op == XTENSA_UNDEFINED + || xtensa_opcode_encode (isa, fmt, 0, sbuff, new_op) != 0 + || xtensa_operand_set_field (isa, new_op, 0, fmt, 0, + sbuff, 1) != 0 + || xtensa_operand_set_field (isa, new_op, 1, fmt, 0, + sbuff, 1) != 0 + || xtensa_operand_set_field (isa, new_op, 2, fmt, 0, + sbuff, 1) != 0) + { + *error_message = "cannot encode OR for TLS access"; + return FALSE; + } + } + else + { + if (xtensa_opcode_encode (isa, fmt, 0, sbuff, new_op) != 0) + { + *error_message = "cannot encode NOP for TLS access"; + return FALSE; + } + } + break; + + case R_XTENSA_TLS_CALL: + /* Read THREADPTR into the CALLX's return value register. */ + new_op = xtensa_opcode_lookup (isa, "rur.threadptr"); + if (new_op == XTENSA_UNDEFINED + || xtensa_opcode_encode (isa, fmt, 0, sbuff, new_op) != 0 + || xtensa_operand_set_field (isa, new_op, 0, fmt, 0, + sbuff, dest_reg + 2) != 0) + { + *error_message = "cannot encode RUR.THREADPTR for TLS access"; + return FALSE; + } + break; + } + } + else + { + switch (r_type) + { + case R_XTENSA_TLS_FUNC: + new_op = xtensa_opcode_lookup (isa, "rur.threadptr"); + if (new_op == XTENSA_UNDEFINED + || xtensa_opcode_encode (isa, fmt, 0, sbuff, new_op) != 0 + || xtensa_operand_set_field (isa, new_op, 0, fmt, 0, + sbuff, dest_reg) != 0) + { + *error_message = "cannot encode RUR.THREADPTR for TLS access"; + return FALSE; + } + break; + + case R_XTENSA_TLS_ARG: + /* Nothing to do. Keep the original L32R instruction. */ + return TRUE; + + case R_XTENSA_TLS_CALL: + /* Add the CALLX's src register (holding the THREADPTR value) + to the first argument register (holding the offset) and put + the result in the CALLX's return value register. */ + new_op = xtensa_opcode_lookup (isa, "add"); + if (new_op == XTENSA_UNDEFINED + || xtensa_opcode_encode (isa, fmt, 0, sbuff, new_op) != 0 + || xtensa_operand_set_field (isa, new_op, 0, fmt, 0, + sbuff, dest_reg + 2) != 0 + || xtensa_operand_set_field (isa, new_op, 1, fmt, 0, + sbuff, dest_reg + 2) != 0 + || xtensa_operand_set_field (isa, new_op, 2, fmt, 0, + sbuff, src_reg) != 0) + { + *error_message = "cannot encode ADD for TLS access"; + return FALSE; + } + break; + } + } + + xtensa_format_set_slot (isa, fmt, 0, ibuff, sbuff); + xtensa_insnbuf_to_chars (isa, ibuff, contents + rel->r_offset, + input_size - rel->r_offset); + + return TRUE; +} + + +#define IS_XTENSA_TLS_RELOC(R_TYPE) \ + ((R_TYPE) == R_XTENSA_TLSDESC_FN \ + || (R_TYPE) == R_XTENSA_TLSDESC_ARG \ + || (R_TYPE) == R_XTENSA_TLS_DTPOFF \ + || (R_TYPE) == R_XTENSA_TLS_TPOFF \ + || (R_TYPE) == R_XTENSA_TLS_FUNC \ + || (R_TYPE) == R_XTENSA_TLS_ARG \ + || (R_TYPE) == R_XTENSA_TLS_CALL) + +/* Relocate an Xtensa ELF section. This is invoked by the linker for + both relocatable and final links. */ + +static bfd_boolean +elf_xtensa_relocate_section (bfd *output_bfd, + struct bfd_link_info *info, + bfd *input_bfd, + asection *input_section, + bfd_byte *contents, + Elf_Internal_Rela *relocs, + Elf_Internal_Sym *local_syms, + asection **local_sections) +{ + struct elf_xtensa_link_hash_table *htab; + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + struct elf_link_hash_entry **sym_hashes; + property_table_entry *lit_table = 0; + int ltblsize = 0; + char *local_got_tls_types; + char *error_message = NULL; + bfd_size_type input_size; + int tls_type; + + if (!xtensa_default_isa) + xtensa_default_isa = xtensa_isa_init (0, 0); + + BFD_ASSERT (is_xtensa_elf (input_bfd)); + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + local_got_tls_types = elf_xtensa_local_got_tls_type (input_bfd); + + if (elf_hash_table (info)->dynamic_sections_created) + { + ltblsize = xtensa_read_table_entries (input_bfd, input_section, + &lit_table, XTENSA_LIT_SEC_NAME, + TRUE); + if (ltblsize < 0) + return FALSE; + } + + input_size = bfd_get_section_limit (input_bfd, input_section); + + rel = relocs; + relend = relocs + input_section->reloc_count; + for (; rel < relend; rel++) + { + int r_type; + reloc_howto_type *howto; + unsigned long r_symndx; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; + char sym_type; + const char *name; + asection *sec; + bfd_vma relocation; + bfd_reloc_status_type r; + bfd_boolean is_weak_undef; + bfd_boolean unresolved_reloc; + bfd_boolean warned; + bfd_boolean dynamic_symbol; + + r_type = ELF32_R_TYPE (rel->r_info); + if (r_type == (int) R_XTENSA_GNU_VTINHERIT + || r_type == (int) R_XTENSA_GNU_VTENTRY) + continue; + + if (r_type < 0 || r_type >= (int) R_XTENSA_max) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + howto = &elf_howto_table[r_type]; + + r_symndx = ELF32_R_SYM (rel->r_info); + + h = NULL; + sym = NULL; + sec = NULL; + is_weak_undef = FALSE; + unresolved_reloc = FALSE; + warned = FALSE; + + if (howto->partial_inplace && !info->relocatable) + { + /* Because R_XTENSA_32 was made partial_inplace to fix some + problems with DWARF info in partial links, there may be + an addend stored in the contents. Take it out of there + and move it back into the addend field of the reloc. */ + rel->r_addend += bfd_get_32 (input_bfd, contents + rel->r_offset); + bfd_put_32 (input_bfd, 0, contents + rel->r_offset); + } + + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sym_type = ELF32_ST_TYPE (sym->st_info); + sec = local_sections[r_symndx]; + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); + } + else + { + bfd_boolean ignored; + + RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, + r_symndx, symtab_hdr, sym_hashes, + h, sec, relocation, + unresolved_reloc, warned, ignored); + + if (relocation == 0 + && !unresolved_reloc + && h->root.type == bfd_link_hash_undefweak) + is_weak_undef = TRUE; + + sym_type = h->type; + } + + if (sec != NULL && discarded_section (sec)) + RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, + rel, 1, relend, howto, 0, contents); + + if (info->relocatable) + { + bfd_vma dest_addr; + asection * sym_sec = get_elf_r_symndx_section (input_bfd, r_symndx); + + /* This is a relocatable link. + 1) If the reloc is against a section symbol, adjust + according to the output section. + 2) If there is a new target for this relocation, + the new target will be in the same output section. + We adjust the relocation by the output section + difference. */ + + if (relaxing_section) + { + /* Check if this references a section in another input file. */ + if (!do_fix_for_relocatable_link (rel, input_bfd, input_section, + contents)) + return FALSE; + } + + dest_addr = sym_sec->output_section->vma + sym_sec->output_offset + + get_elf_r_symndx_offset (input_bfd, r_symndx) + rel->r_addend; + + if (r_type == R_XTENSA_ASM_SIMPLIFY) + { + error_message = NULL; + /* Convert ASM_SIMPLIFY into the simpler relocation + so that they never escape a relaxing link. */ + r = contract_asm_expansion (contents, input_size, rel, + &error_message); + if (r != bfd_reloc_ok) + { + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + r_type = ELF32_R_TYPE (rel->r_info); + } + + /* This is a relocatable link, so we don't have to change + anything unless the reloc is against a section symbol, + in which case we have to adjust according to where the + section symbol winds up in the output section. */ + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) + { + sec = local_sections[r_symndx]; + rel->r_addend += sec->output_offset + sym->st_value; + } + } + + /* If there is an addend with a partial_inplace howto, + then move the addend to the contents. This is a hack + to work around problems with DWARF in relocatable links + with some previous version of BFD. Now we can't easily get + rid of the hack without breaking backward compatibility.... */ + r = bfd_reloc_ok; + howto = &elf_howto_table[r_type]; + if (howto->partial_inplace && rel->r_addend) + { + r = elf_xtensa_do_reloc (howto, input_bfd, input_section, + rel->r_addend, contents, + rel->r_offset, FALSE, + &error_message); + rel->r_addend = 0; + } + else + { + /* Put the correct bits in the target instruction, even + though the relocation will still be present in the output + file. This makes disassembly clearer, as well as + allowing loadable kernel modules to work without needing + relocations on anything other than calls and l32r's. */ + + /* If it is not in the same section, there is nothing we can do. */ + if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP && + sym_sec->output_section == input_section->output_section) + { + r = elf_xtensa_do_reloc (howto, input_bfd, input_section, + dest_addr, contents, + rel->r_offset, FALSE, + &error_message); + } + } + if (r != bfd_reloc_ok) + { + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + + /* Done with work for relocatable link; continue with next reloc. */ + continue; + } + + /* This is a final link. */ + + if (relaxing_section) + { + /* Check if this references a section in another input file. */ + do_fix_for_final_link (rel, input_bfd, input_section, contents, + &relocation); + } + + /* Sanity check the address. */ + if (rel->r_offset >= input_size + && ELF32_R_TYPE (rel->r_info) != R_XTENSA_NONE) + { + (*_bfd_error_handler) + (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"), + input_bfd, input_section, rel->r_offset, input_size); + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + if (h != NULL) + name = h->root.root.string; + else + { + name = (bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name)); + if (name == NULL || *name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + if (r_symndx != STN_UNDEF + && r_type != R_XTENSA_NONE + && (h == NULL + || h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + && IS_XTENSA_TLS_RELOC (r_type) != (sym_type == STT_TLS)) + { + (*_bfd_error_handler) + ((sym_type == STT_TLS + ? _("%B(%A+0x%lx): %s used with TLS symbol %s") + : _("%B(%A+0x%lx): %s used with non-TLS symbol %s")), + input_bfd, + input_section, + (long) rel->r_offset, + howto->name, + name); + } + + dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info); + + tls_type = GOT_UNKNOWN; + if (h) + tls_type = elf_xtensa_hash_entry (h)->tls_type; + else if (local_got_tls_types) + tls_type = local_got_tls_types [r_symndx]; + + switch (r_type) + { + case R_XTENSA_32: + case R_XTENSA_PLT: + if (elf_hash_table (info)->dynamic_sections_created + && (input_section->flags & SEC_ALLOC) != 0 + && (dynamic_symbol || info->shared)) + { + Elf_Internal_Rela outrel; + bfd_byte *loc; + asection *srel; + + if (dynamic_symbol && r_type == R_XTENSA_PLT) + srel = htab->srelplt; + else + srel = htab->srelgot; + + BFD_ASSERT (srel != NULL); + + outrel.r_offset = + _bfd_elf_section_offset (output_bfd, info, + input_section, rel->r_offset); + + if ((outrel.r_offset | 1) == (bfd_vma) -1) + memset (&outrel, 0, sizeof outrel); + else + { + outrel.r_offset += (input_section->output_section->vma + + input_section->output_offset); + + /* Complain if the relocation is in a read-only section + and not in a literal pool. */ + if ((input_section->flags & SEC_READONLY) != 0 + && !elf_xtensa_in_literal_pool (lit_table, ltblsize, + outrel.r_offset)) + { + error_message = + _("dynamic relocation in read-only section"); + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + + if (dynamic_symbol) + { + outrel.r_addend = rel->r_addend; + rel->r_addend = 0; + + if (r_type == R_XTENSA_32) + { + outrel.r_info = + ELF32_R_INFO (h->dynindx, R_XTENSA_GLOB_DAT); + relocation = 0; + } + else /* r_type == R_XTENSA_PLT */ + { + outrel.r_info = + ELF32_R_INFO (h->dynindx, R_XTENSA_JMP_SLOT); + + /* Create the PLT entry and set the initial + contents of the literal entry to the address of + the PLT entry. */ + relocation = + elf_xtensa_create_plt_entry (info, output_bfd, + srel->reloc_count); + } + unresolved_reloc = FALSE; + } + else + { + /* Generate a RELATIVE relocation. */ + outrel.r_info = ELF32_R_INFO (0, R_XTENSA_RELATIVE); + outrel.r_addend = 0; + } + } + + loc = (srel->contents + + srel->reloc_count++ * sizeof (Elf32_External_Rela)); + bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); + BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count + <= srel->size); + } + else if (r_type == R_XTENSA_ASM_EXPAND && dynamic_symbol) + { + /* This should only happen for non-PIC code, which is not + supposed to be used on systems with dynamic linking. + Just ignore these relocations. */ + continue; + } + break; + + case R_XTENSA_TLS_TPOFF: + /* Switch to LE model for local symbols in an executable. */ + if (! info->shared && ! dynamic_symbol) + { + relocation = tpoff (info, relocation); + break; + } + /* fall through */ + + case R_XTENSA_TLSDESC_FN: + case R_XTENSA_TLSDESC_ARG: + { + if (r_type == R_XTENSA_TLSDESC_FN) + { + if (! info->shared || (tls_type & GOT_TLS_IE) != 0) + r_type = R_XTENSA_NONE; + } + else if (r_type == R_XTENSA_TLSDESC_ARG) + { + if (info->shared) + { + if ((tls_type & GOT_TLS_IE) != 0) + r_type = R_XTENSA_TLS_TPOFF; + } + else + { + r_type = R_XTENSA_TLS_TPOFF; + if (! dynamic_symbol) + { + relocation = tpoff (info, relocation); + break; + } + } + } + + if (r_type == R_XTENSA_NONE) + /* Nothing to do here; skip to the next reloc. */ + continue; + + if (! elf_hash_table (info)->dynamic_sections_created) + { + error_message = + _("TLS relocation invalid without dynamic sections"); + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + else + { + Elf_Internal_Rela outrel; + bfd_byte *loc; + asection *srel = htab->srelgot; + int indx; + + outrel.r_offset = (input_section->output_section->vma + + input_section->output_offset + + rel->r_offset); + + /* Complain if the relocation is in a read-only section + and not in a literal pool. */ + if ((input_section->flags & SEC_READONLY) != 0 + && ! elf_xtensa_in_literal_pool (lit_table, ltblsize, + outrel.r_offset)) + { + error_message = + _("dynamic relocation in read-only section"); + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + + indx = h && h->dynindx != -1 ? h->dynindx : 0; + if (indx == 0) + outrel.r_addend = relocation - dtpoff_base (info); + else + outrel.r_addend = 0; + rel->r_addend = 0; + + outrel.r_info = ELF32_R_INFO (indx, r_type); + relocation = 0; + unresolved_reloc = FALSE; + + BFD_ASSERT (srel); + loc = (srel->contents + + srel->reloc_count++ * sizeof (Elf32_External_Rela)); + bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); + BFD_ASSERT (sizeof (Elf32_External_Rela) * srel->reloc_count + <= srel->size); + } + } + break; + + case R_XTENSA_TLS_DTPOFF: + if (! info->shared) + /* Switch from LD model to LE model. */ + relocation = tpoff (info, relocation); + else + relocation -= dtpoff_base (info); + break; + + case R_XTENSA_TLS_FUNC: + case R_XTENSA_TLS_ARG: + case R_XTENSA_TLS_CALL: + /* Check if optimizing to IE or LE model. */ + if ((tls_type & GOT_TLS_IE) != 0) + { + bfd_boolean is_ld_model = + (h && elf_xtensa_hash_entry (h) == htab->tlsbase); + if (! replace_tls_insn (rel, input_bfd, input_section, contents, + is_ld_model, &error_message)) + { + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + + if (r_type != R_XTENSA_TLS_ARG || is_ld_model) + { + /* Skip subsequent relocations on the same instruction. */ + while (rel + 1 < relend && rel[1].r_offset == rel->r_offset) + rel++; + } + } + continue; + + default: + if (elf_hash_table (info)->dynamic_sections_created + && dynamic_symbol && (is_operand_relocation (r_type) + || r_type == R_XTENSA_32_PCREL)) + { + error_message = + vsprint_msg ("invalid relocation for dynamic symbol", ": %s", + strlen (name) + 2, name); + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + continue; + } + break; + } + + /* Dynamic relocs are not propagated for SEC_DEBUGGING sections + because such sections are not SEC_ALLOC and thus ld.so will + not process them. */ + if (unresolved_reloc + && !((input_section->flags & SEC_DEBUGGING) != 0 + && h->def_dynamic) + && _bfd_elf_section_offset (output_bfd, info, input_section, + rel->r_offset) != (bfd_vma) -1) + { + (*_bfd_error_handler) + (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"), + input_bfd, + input_section, + (long) rel->r_offset, + howto->name, + name); + return FALSE; + } + + /* TLS optimizations may have changed r_type; update "howto". */ + howto = &elf_howto_table[r_type]; + + /* There's no point in calling bfd_perform_relocation here. + Just go directly to our "special function". */ + r = elf_xtensa_do_reloc (howto, input_bfd, input_section, + relocation + rel->r_addend, + contents, rel->r_offset, is_weak_undef, + &error_message); + + if (r != bfd_reloc_ok && !warned) + { + BFD_ASSERT (r == bfd_reloc_dangerous || r == bfd_reloc_other); + BFD_ASSERT (error_message != NULL); + + if (rel->r_addend == 0) + error_message = vsprint_msg (error_message, ": %s", + strlen (name) + 2, name); + else + error_message = vsprint_msg (error_message, ": (%s+0x%x)", + strlen (name) + 22, + name, (int) rel->r_addend); + + if (!((*info->callbacks->reloc_dangerous) + (info, error_message, input_bfd, input_section, + rel->r_offset))) + return FALSE; + } + } + + if (lit_table) + free (lit_table); + + input_section->reloc_done = TRUE; + + return TRUE; +} + + +/* Finish up dynamic symbol handling. There's not much to do here since + the PLT and GOT entries are all set up by relocate_section. */ + +static bfd_boolean +elf_xtensa_finish_dynamic_symbol (bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED, + struct elf_link_hash_entry *h, + Elf_Internal_Sym *sym) +{ + if (h->needs_plt && !h->def_regular) + { + /* Mark the symbol as undefined, rather than as defined in + the .plt section. Leave the value alone. */ + sym->st_shndx = SHN_UNDEF; + /* If the symbol is weak, we do need to clear the value. + Otherwise, the PLT entry would provide a definition for + the symbol even if the symbol wasn't defined anywhere, + and so the symbol would never be NULL. */ + if (!h->ref_regular_nonweak) + sym->st_value = 0; + } + + /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ + if (h == elf_hash_table (info)->hdynamic + || h == elf_hash_table (info)->hgot) + sym->st_shndx = SHN_ABS; + + return TRUE; +} + + +/* Combine adjacent literal table entries in the output. Adjacent + entries within each input section may have been removed during + relaxation, but we repeat the process here, even though it's too late + to shrink the output section, because it's important to minimize the + number of literal table entries to reduce the start-up work for the + runtime linker. Returns the number of remaining table entries or -1 + on error. */ + +static int +elf_xtensa_combine_prop_entries (bfd *output_bfd, + asection *sxtlit, + asection *sgotloc) +{ + bfd_byte *contents; + property_table_entry *table; + bfd_size_type section_size, sgotloc_size; + bfd_vma offset; + int n, m, num; + + section_size = sxtlit->size; + BFD_ASSERT (section_size % 8 == 0); + num = section_size / 8; + + sgotloc_size = sgotloc->size; + if (sgotloc_size != section_size) + { + (*_bfd_error_handler) + (_("internal inconsistency in size of .got.loc section")); + return -1; + } + + table = bfd_malloc (num * sizeof (property_table_entry)); + if (table == 0) + return -1; + + /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this + propagates to the output section, where it doesn't really apply and + where it breaks the following call to bfd_malloc_and_get_section. */ + sxtlit->flags &= ~SEC_IN_MEMORY; + + if (!bfd_malloc_and_get_section (output_bfd, sxtlit, &contents)) + { + if (contents != 0) + free (contents); + free (table); + return -1; + } + + /* There should never be any relocations left at this point, so this + is quite a bit easier than what is done during relaxation. */ + + /* Copy the raw contents into a property table array and sort it. */ + offset = 0; + for (n = 0; n < num; n++) + { + table[n].address = bfd_get_32 (output_bfd, &contents[offset]); + table[n].size = bfd_get_32 (output_bfd, &contents[offset + 4]); + offset += 8; + } + qsort (table, num, sizeof (property_table_entry), property_table_compare); + + for (n = 0; n < num; n++) + { + bfd_boolean remove_entry = FALSE; + + if (table[n].size == 0) + remove_entry = TRUE; + else if (n > 0 + && (table[n-1].address + table[n-1].size == table[n].address)) + { + table[n-1].size += table[n].size; + remove_entry = TRUE; + } + + if (remove_entry) + { + for (m = n; m < num - 1; m++) + { + table[m].address = table[m+1].address; + table[m].size = table[m+1].size; + } + + n--; + num--; + } + } + + /* Copy the data back to the raw contents. */ + offset = 0; + for (n = 0; n < num; n++) + { + bfd_put_32 (output_bfd, table[n].address, &contents[offset]); + bfd_put_32 (output_bfd, table[n].size, &contents[offset + 4]); + offset += 8; + } + + /* Clear the removed bytes. */ + if ((bfd_size_type) (num * 8) < section_size) + memset (&contents[num * 8], 0, section_size - num * 8); + + if (! bfd_set_section_contents (output_bfd, sxtlit, contents, 0, + section_size)) + return -1; + + /* Copy the contents to ".got.loc". */ + memcpy (sgotloc->contents, contents, section_size); + + free (contents); + free (table); + return num; +} + + +/* Finish up the dynamic sections. */ + +static bfd_boolean +elf_xtensa_finish_dynamic_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + struct elf_xtensa_link_hash_table *htab; + bfd *dynobj; + asection *sdyn, *srelplt, *sgot, *sxtlit, *sgotloc; + Elf32_External_Dyn *dyncon, *dynconend; + int num_xtlit_entries = 0; + + if (! elf_hash_table (info)->dynamic_sections_created) + return TRUE; + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return FALSE; + + dynobj = elf_hash_table (info)->dynobj; + sdyn = bfd_get_linker_section (dynobj, ".dynamic"); + BFD_ASSERT (sdyn != NULL); + + /* Set the first entry in the global offset table to the address of + the dynamic section. */ + sgot = htab->sgot; + if (sgot) + { + BFD_ASSERT (sgot->size == 4); + if (sdyn == NULL) + bfd_put_32 (output_bfd, 0, sgot->contents); + else + bfd_put_32 (output_bfd, + sdyn->output_section->vma + sdyn->output_offset, + sgot->contents); + } + + srelplt = htab->srelplt; + if (srelplt && srelplt->size != 0) + { + asection *sgotplt, *srelgot, *spltlittbl; + int chunk, plt_chunks, plt_entries; + Elf_Internal_Rela irela; + bfd_byte *loc; + unsigned rtld_reloc; + + srelgot = htab->srelgot; + spltlittbl = htab->spltlittbl; + BFD_ASSERT (srelgot != NULL && spltlittbl != NULL); + + /* Find the first XTENSA_RTLD relocation. Presumably the rest + of them follow immediately after.... */ + for (rtld_reloc = 0; rtld_reloc < srelgot->reloc_count; rtld_reloc++) + { + loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); + if (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD) + break; + } + BFD_ASSERT (rtld_reloc < srelgot->reloc_count); + + plt_entries = srelplt->size / sizeof (Elf32_External_Rela); + plt_chunks = + (plt_entries + PLT_ENTRIES_PER_CHUNK - 1) / PLT_ENTRIES_PER_CHUNK; + + for (chunk = 0; chunk < plt_chunks; chunk++) + { + int chunk_entries = 0; + + sgotplt = elf_xtensa_get_gotplt_section (info, chunk); + BFD_ASSERT (sgotplt != NULL); + + /* Emit special RTLD relocations for the first two entries in + each chunk of the .got.plt section. */ + + loc = srelgot->contents + rtld_reloc * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); + BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD); + irela.r_offset = (sgotplt->output_section->vma + + sgotplt->output_offset); + irela.r_addend = 1; /* tell rtld to set value to resolver function */ + bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); + rtld_reloc += 1; + BFD_ASSERT (rtld_reloc <= srelgot->reloc_count); + + /* Next literal immediately follows the first. */ + loc += sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_in (output_bfd, loc, &irela); + BFD_ASSERT (ELF32_R_TYPE (irela.r_info) == R_XTENSA_RTLD); + irela.r_offset = (sgotplt->output_section->vma + + sgotplt->output_offset + 4); + /* Tell rtld to set value to object's link map. */ + irela.r_addend = 2; + bfd_elf32_swap_reloca_out (output_bfd, &irela, loc); + rtld_reloc += 1; + BFD_ASSERT (rtld_reloc <= srelgot->reloc_count); + + /* Fill in the literal table. */ + if (chunk < plt_chunks - 1) + chunk_entries = PLT_ENTRIES_PER_CHUNK; + else + chunk_entries = plt_entries - (chunk * PLT_ENTRIES_PER_CHUNK); + + BFD_ASSERT ((unsigned) (chunk + 1) * 8 <= spltlittbl->size); + bfd_put_32 (output_bfd, + sgotplt->output_section->vma + sgotplt->output_offset, + spltlittbl->contents + (chunk * 8) + 0); + bfd_put_32 (output_bfd, + 8 + (chunk_entries * 4), + spltlittbl->contents + (chunk * 8) + 4); + } + + /* All the dynamic relocations have been emitted at this point. + Make sure the relocation sections are the correct size. */ + if (srelgot->size != (sizeof (Elf32_External_Rela) + * srelgot->reloc_count) + || srelplt->size != (sizeof (Elf32_External_Rela) + * srelplt->reloc_count)) + abort (); + + /* The .xt.lit.plt section has just been modified. This must + happen before the code below which combines adjacent literal + table entries, and the .xt.lit.plt contents have to be forced to + the output here. */ + if (! bfd_set_section_contents (output_bfd, + spltlittbl->output_section, + spltlittbl->contents, + spltlittbl->output_offset, + spltlittbl->size)) + return FALSE; + /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */ + spltlittbl->flags &= ~SEC_HAS_CONTENTS; + } + + /* Combine adjacent literal table entries. */ + BFD_ASSERT (! info->relocatable); + sxtlit = bfd_get_section_by_name (output_bfd, ".xt.lit"); + sgotloc = htab->sgotloc; + BFD_ASSERT (sgotloc); + if (sxtlit) + { + num_xtlit_entries = + elf_xtensa_combine_prop_entries (output_bfd, sxtlit, sgotloc); + if (num_xtlit_entries < 0) + return FALSE; + } + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + break; + + case DT_XTENSA_GOT_LOC_SZ: + dyn.d_un.d_val = num_xtlit_entries; + break; + + case DT_XTENSA_GOT_LOC_OFF: + dyn.d_un.d_ptr = htab->sgotloc->output_section->vma; + break; + + case DT_PLTGOT: + dyn.d_un.d_ptr = htab->sgot->output_section->vma; + break; + + case DT_JMPREL: + dyn.d_un.d_ptr = htab->srelplt->output_section->vma; + break; + + case DT_PLTRELSZ: + dyn.d_un.d_val = htab->srelplt->output_section->size; + break; + + case DT_RELASZ: + /* Adjust RELASZ to not include JMPREL. This matches what + glibc expects and what is done for several other ELF + targets (e.g., i386, alpha), but the "correct" behavior + seems to be unresolved. Since the linker script arranges + for .rela.plt to follow all other relocation sections, we + don't have to worry about changing the DT_RELA entry. */ + if (htab->srelplt) + dyn.d_un.d_val -= htab->srelplt->output_section->size; + break; + } + + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + } + + return TRUE; +} + + +/* Functions for dealing with the e_flags field. */ + +/* Merge backend specific data from an object file to the output + object file when linking. */ + +static bfd_boolean +elf_xtensa_merge_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + unsigned out_mach, in_mach; + flagword out_flag, in_flag; + + /* Check if we have the same endianness. */ + if (!_bfd_generic_verify_endian_match (ibfd, obfd)) + return FALSE; + + /* Don't even pretend to support mixed-format linking. */ + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return FALSE; + + out_flag = elf_elfheader (obfd)->e_flags; + in_flag = elf_elfheader (ibfd)->e_flags; + + out_mach = out_flag & EF_XTENSA_MACH; + in_mach = in_flag & EF_XTENSA_MACH; + if (out_mach != in_mach) + { + (*_bfd_error_handler) + (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"), + ibfd, out_mach, in_mach); + bfd_set_error (bfd_error_wrong_format); + return FALSE; + } + + if (! elf_flags_init (obfd)) + { + elf_flags_init (obfd) = TRUE; + elf_elfheader (obfd)->e_flags = in_flag; + + if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) + && bfd_get_arch_info (obfd)->the_default) + return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), + bfd_get_mach (ibfd)); + + return TRUE; + } + + if ((out_flag & EF_XTENSA_XT_INSN) != (in_flag & EF_XTENSA_XT_INSN)) + elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_INSN); + + if ((out_flag & EF_XTENSA_XT_LIT) != (in_flag & EF_XTENSA_XT_LIT)) + elf_elfheader (obfd)->e_flags &= (~ EF_XTENSA_XT_LIT); + + return TRUE; +} + + +static bfd_boolean +elf_xtensa_set_private_flags (bfd *abfd, flagword flags) +{ + BFD_ASSERT (!elf_flags_init (abfd) + || elf_elfheader (abfd)->e_flags == flags); + + elf_elfheader (abfd)->e_flags |= flags; + elf_flags_init (abfd) = TRUE; + + return TRUE; +} + + +static bfd_boolean +elf_xtensa_print_private_bfd_data (bfd *abfd, void *farg) +{ + FILE *f = (FILE *) farg; + flagword e_flags = elf_elfheader (abfd)->e_flags; + + fprintf (f, "\nXtensa header:\n"); + if ((e_flags & EF_XTENSA_MACH) == E_XTENSA_MACH) + fprintf (f, "\nMachine = Base\n"); + else + fprintf (f, "\nMachine Id = 0x%x\n", e_flags & EF_XTENSA_MACH); + + fprintf (f, "Insn tables = %s\n", + (e_flags & EF_XTENSA_XT_INSN) ? "true" : "false"); + + fprintf (f, "Literal tables = %s\n", + (e_flags & EF_XTENSA_XT_LIT) ? "true" : "false"); + + return _bfd_elf_print_private_bfd_data (abfd, farg); +} + + +/* Set the right machine number for an Xtensa ELF file. */ + +static bfd_boolean +elf_xtensa_object_p (bfd *abfd) +{ + int mach; + unsigned long arch = elf_elfheader (abfd)->e_flags & EF_XTENSA_MACH; + + switch (arch) + { + case E_XTENSA_MACH: + mach = bfd_mach_xtensa; + break; + default: + return FALSE; + } + + (void) bfd_default_set_arch_mach (abfd, bfd_arch_xtensa, mach); + return TRUE; +} + + +/* The final processing done just before writing out an Xtensa ELF object + file. This gets the Xtensa architecture right based on the machine + number. */ + +static void +elf_xtensa_final_write_processing (bfd *abfd, + bfd_boolean linker ATTRIBUTE_UNUSED) +{ + int mach; + unsigned long val; + + switch (mach = bfd_get_mach (abfd)) + { + case bfd_mach_xtensa: + val = E_XTENSA_MACH; + break; + default: + return; + } + + elf_elfheader (abfd)->e_flags &= (~ EF_XTENSA_MACH); + elf_elfheader (abfd)->e_flags |= val; +} + + +static enum elf_reloc_type_class +elf_xtensa_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED, + const asection *rel_sec ATTRIBUTE_UNUSED, + const Elf_Internal_Rela *rela) +{ + switch ((int) ELF32_R_TYPE (rela->r_info)) + { + case R_XTENSA_RELATIVE: + return reloc_class_relative; + case R_XTENSA_JMP_SLOT: + return reloc_class_plt; + default: + return reloc_class_normal; + } +} + + +static bfd_boolean +elf_xtensa_discard_info_for_section (bfd *abfd, + struct elf_reloc_cookie *cookie, + struct bfd_link_info *info, + asection *sec) +{ + bfd_byte *contents; + bfd_vma offset, actual_offset; + bfd_size_type removed_bytes = 0; + bfd_size_type entry_size; + + if (sec->output_section + && bfd_is_abs_section (sec->output_section)) + return FALSE; + + if (xtensa_is_proptable_section (sec)) + entry_size = 12; + else + entry_size = 8; + + if (sec->size == 0 || sec->size % entry_size != 0) + return FALSE; + + contents = retrieve_contents (abfd, sec, info->keep_memory); + if (!contents) + return FALSE; + + cookie->rels = retrieve_internal_relocs (abfd, sec, info->keep_memory); + if (!cookie->rels) + { + release_contents (sec, contents); + return FALSE; + } + + /* Sort the relocations. They should already be in order when + relaxation is enabled, but it might not be. */ + qsort (cookie->rels, sec->reloc_count, sizeof (Elf_Internal_Rela), + internal_reloc_compare); + + cookie->rel = cookie->rels; + cookie->relend = cookie->rels + sec->reloc_count; + + for (offset = 0; offset < sec->size; offset += entry_size) + { + actual_offset = offset - removed_bytes; + + /* The ...symbol_deleted_p function will skip over relocs but it + won't adjust their offsets, so do that here. */ + while (cookie->rel < cookie->relend + && cookie->rel->r_offset < offset) + { + cookie->rel->r_offset -= removed_bytes; + cookie->rel++; + } + + while (cookie->rel < cookie->relend + && cookie->rel->r_offset == offset) + { + if (bfd_elf_reloc_symbol_deleted_p (offset, cookie)) + { + /* Remove the table entry. (If the reloc type is NONE, then + the entry has already been merged with another and deleted + during relaxation.) */ + if (ELF32_R_TYPE (cookie->rel->r_info) != R_XTENSA_NONE) + { + /* Shift the contents up. */ + if (offset + entry_size < sec->size) + memmove (&contents[actual_offset], + &contents[actual_offset + entry_size], + sec->size - offset - entry_size); + removed_bytes += entry_size; + } + + /* Remove this relocation. */ + cookie->rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + } + + /* Adjust the relocation offset for previous removals. This + should not be done before calling ...symbol_deleted_p + because it might mess up the offset comparisons there. + Make sure the offset doesn't underflow in the case where + the first entry is removed. */ + if (cookie->rel->r_offset >= removed_bytes) + cookie->rel->r_offset -= removed_bytes; + else + cookie->rel->r_offset = 0; + + cookie->rel++; + } + } + + if (removed_bytes != 0) + { + /* Adjust any remaining relocs (shouldn't be any). */ + for (; cookie->rel < cookie->relend; cookie->rel++) + { + if (cookie->rel->r_offset >= removed_bytes) + cookie->rel->r_offset -= removed_bytes; + else + cookie->rel->r_offset = 0; + } + + /* Clear the removed bytes. */ + memset (&contents[sec->size - removed_bytes], 0, removed_bytes); + + pin_contents (sec, contents); + pin_internal_relocs (sec, cookie->rels); + + /* Shrink size. */ + if (sec->rawsize == 0) + sec->rawsize = sec->size; + sec->size -= removed_bytes; + + if (xtensa_is_littable_section (sec)) + { + asection *sgotloc = elf_xtensa_hash_table (info)->sgotloc; + if (sgotloc) + sgotloc->size -= removed_bytes; + } + } + else + { + release_contents (sec, contents); + release_internal_relocs (sec, cookie->rels); + } + + return (removed_bytes != 0); +} + + +static bfd_boolean +elf_xtensa_discard_info (bfd *abfd, + struct elf_reloc_cookie *cookie, + struct bfd_link_info *info) +{ + asection *sec; + bfd_boolean changed = FALSE; + + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + if (xtensa_is_property_section (sec)) + { + if (elf_xtensa_discard_info_for_section (abfd, cookie, info, sec)) + changed = TRUE; + } + } + + return changed; +} + + +static bfd_boolean +elf_xtensa_ignore_discarded_relocs (asection *sec) +{ + return xtensa_is_property_section (sec); +} + + +static unsigned int +elf_xtensa_action_discarded (asection *sec) +{ + if (strcmp (".xt_except_table", sec->name) == 0) + return 0; + + if (strcmp (".xt_except_desc", sec->name) == 0) + return 0; + + return _bfd_elf_default_action_discarded (sec); +} + + +/* Support for core dump NOTE sections. */ + +static bfd_boolean +elf_xtensa_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) +{ + int offset; + unsigned int size; + + /* The size for Xtensa is variable, so don't try to recognize the format + based on the size. Just assume this is GNU/Linux. */ + + /* pr_cursig */ + elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12); + + /* pr_pid */ + elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24); + + /* pr_reg */ + offset = 72; + size = note->descsz - offset - 4; + + /* Make a ".reg/999" section. */ + return _bfd_elfcore_make_pseudosection (abfd, ".reg", + size, note->descpos + offset); +} + + +static bfd_boolean +elf_xtensa_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) +{ + switch (note->descsz) + { + default: + return FALSE; + + case 128: /* GNU/Linux elf_prpsinfo */ + elf_tdata (abfd)->core->program + = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16); + elf_tdata (abfd)->core->command + = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80); + } + + /* Note that for some reason, a spurious space is tacked + onto the end of the args in some (at least one anyway) + implementations, so strip it off if it exists. */ + + { + char *command = elf_tdata (abfd)->core->command; + int n = strlen (command); + + if (0 < n && command[n - 1] == ' ') + command[n - 1] = '\0'; + } + + return TRUE; +} + + +/* Generic Xtensa configurability stuff. */ + +static xtensa_opcode callx0_op = XTENSA_UNDEFINED; +static xtensa_opcode callx4_op = XTENSA_UNDEFINED; +static xtensa_opcode callx8_op = XTENSA_UNDEFINED; +static xtensa_opcode callx12_op = XTENSA_UNDEFINED; +static xtensa_opcode call0_op = XTENSA_UNDEFINED; +static xtensa_opcode call4_op = XTENSA_UNDEFINED; +static xtensa_opcode call8_op = XTENSA_UNDEFINED; +static xtensa_opcode call12_op = XTENSA_UNDEFINED; + +static void +init_call_opcodes (void) +{ + if (callx0_op == XTENSA_UNDEFINED) + { + callx0_op = xtensa_opcode_lookup (xtensa_default_isa, "callx0"); + callx4_op = xtensa_opcode_lookup (xtensa_default_isa, "callx4"); + callx8_op = xtensa_opcode_lookup (xtensa_default_isa, "callx8"); + callx12_op = xtensa_opcode_lookup (xtensa_default_isa, "callx12"); + call0_op = xtensa_opcode_lookup (xtensa_default_isa, "call0"); + call4_op = xtensa_opcode_lookup (xtensa_default_isa, "call4"); + call8_op = xtensa_opcode_lookup (xtensa_default_isa, "call8"); + call12_op = xtensa_opcode_lookup (xtensa_default_isa, "call12"); + } +} + + +static bfd_boolean +is_indirect_call_opcode (xtensa_opcode opcode) +{ + init_call_opcodes (); + return (opcode == callx0_op + || opcode == callx4_op + || opcode == callx8_op + || opcode == callx12_op); +} + + +static bfd_boolean +is_direct_call_opcode (xtensa_opcode opcode) +{ + init_call_opcodes (); + return (opcode == call0_op + || opcode == call4_op + || opcode == call8_op + || opcode == call12_op); +} + + +static bfd_boolean +is_windowed_call_opcode (xtensa_opcode opcode) +{ + init_call_opcodes (); + return (opcode == call4_op + || opcode == call8_op + || opcode == call12_op + || opcode == callx4_op + || opcode == callx8_op + || opcode == callx12_op); +} + + +static bfd_boolean +get_indirect_call_dest_reg (xtensa_opcode opcode, unsigned *pdst) +{ + unsigned dst = (unsigned) -1; + + init_call_opcodes (); + if (opcode == callx0_op) + dst = 0; + else if (opcode == callx4_op) + dst = 4; + else if (opcode == callx8_op) + dst = 8; + else if (opcode == callx12_op) + dst = 12; + + if (dst == (unsigned) -1) + return FALSE; + + *pdst = dst; + return TRUE; +} + + +static xtensa_opcode +get_const16_opcode (void) +{ + static bfd_boolean done_lookup = FALSE; + static xtensa_opcode const16_opcode = XTENSA_UNDEFINED; + if (!done_lookup) + { + const16_opcode = xtensa_opcode_lookup (xtensa_default_isa, "const16"); + done_lookup = TRUE; + } + return const16_opcode; +} + + +static xtensa_opcode +get_l32r_opcode (void) +{ + static xtensa_opcode l32r_opcode = XTENSA_UNDEFINED; + static bfd_boolean done_lookup = FALSE; + + if (!done_lookup) + { + l32r_opcode = xtensa_opcode_lookup (xtensa_default_isa, "l32r"); + done_lookup = TRUE; + } + return l32r_opcode; +} + + +static bfd_vma +l32r_offset (bfd_vma addr, bfd_vma pc) +{ + bfd_vma offset; + + offset = addr - ((pc+3) & -4); + BFD_ASSERT ((offset & ((1 << 2) - 1)) == 0); + offset = (signed int) offset >> 2; + BFD_ASSERT ((signed int) offset >> 16 == -1); + return offset; +} + + +static int +get_relocation_opnd (xtensa_opcode opcode, int r_type) +{ + xtensa_isa isa = xtensa_default_isa; + int last_immed, last_opnd, opi; + + if (opcode == XTENSA_UNDEFINED) + return XTENSA_UNDEFINED; + + /* Find the last visible PC-relative immediate operand for the opcode. + If there are no PC-relative immediates, then choose the last visible + immediate; otherwise, fail and return XTENSA_UNDEFINED. */ + last_immed = XTENSA_UNDEFINED; + last_opnd = xtensa_opcode_num_operands (isa, opcode); + for (opi = last_opnd - 1; opi >= 0; opi--) + { + if (xtensa_operand_is_visible (isa, opcode, opi) == 0) + continue; + if (xtensa_operand_is_PCrelative (isa, opcode, opi) == 1) + { + last_immed = opi; + break; + } + if (last_immed == XTENSA_UNDEFINED + && xtensa_operand_is_register (isa, opcode, opi) == 0) + last_immed = opi; + } + if (last_immed < 0) + return XTENSA_UNDEFINED; + + /* If the operand number was specified in an old-style relocation, + check for consistency with the operand computed above. */ + if (r_type >= R_XTENSA_OP0 && r_type <= R_XTENSA_OP2) + { + int reloc_opnd = r_type - R_XTENSA_OP0; + if (reloc_opnd != last_immed) + return XTENSA_UNDEFINED; + } + + return last_immed; +} + + +int +get_relocation_slot (int r_type) +{ + switch (r_type) + { + case R_XTENSA_OP0: + case R_XTENSA_OP1: + case R_XTENSA_OP2: + return 0; + + default: + if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP) + return r_type - R_XTENSA_SLOT0_OP; + if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT) + return r_type - R_XTENSA_SLOT0_ALT; + break; + } + + return XTENSA_UNDEFINED; +} + + +/* Get the opcode for a relocation. */ + +static xtensa_opcode +get_relocation_opcode (bfd *abfd, + asection *sec, + bfd_byte *contents, + Elf_Internal_Rela *irel) +{ + static xtensa_insnbuf ibuff = NULL; + static xtensa_insnbuf sbuff = NULL; + xtensa_isa isa = xtensa_default_isa; + xtensa_format fmt; + int slot; + + if (contents == NULL) + return XTENSA_UNDEFINED; + + if (bfd_get_section_limit (abfd, sec) <= irel->r_offset) + return XTENSA_UNDEFINED; + + if (ibuff == NULL) + { + ibuff = xtensa_insnbuf_alloc (isa); + sbuff = xtensa_insnbuf_alloc (isa); + } + + /* Decode the instruction. */ + xtensa_insnbuf_from_chars (isa, ibuff, &contents[irel->r_offset], + sec->size - irel->r_offset); + fmt = xtensa_format_decode (isa, ibuff); + slot = get_relocation_slot (ELF32_R_TYPE (irel->r_info)); + if (slot == XTENSA_UNDEFINED) + return XTENSA_UNDEFINED; + xtensa_format_get_slot (isa, fmt, slot, ibuff, sbuff); + return xtensa_opcode_decode (isa, fmt, slot, sbuff); +} + + +bfd_boolean +is_l32r_relocation (bfd *abfd, + asection *sec, + bfd_byte *contents, + Elf_Internal_Rela *irel) +{ + xtensa_opcode opcode; + if (!is_operand_relocation (ELF32_R_TYPE (irel->r_info))) + return FALSE; + opcode = get_relocation_opcode (abfd, sec, contents, irel); + return (opcode == get_l32r_opcode ()); +} + + +static bfd_size_type +get_asm_simplify_size (bfd_byte *contents, + bfd_size_type content_len, + bfd_size_type offset) +{ + bfd_size_type insnlen, size = 0; + + /* Decode the size of the next two instructions. */ + insnlen = insn_decode_len (contents, content_len, offset); + if (insnlen == 0) + return 0; + + size += insnlen; + + insnlen = insn_decode_len (contents, content_len, offset + size); + if (insnlen == 0) + return 0; + + size += insnlen; + return size; +} + + +bfd_boolean +is_alt_relocation (int r_type) +{ + return (r_type >= R_XTENSA_SLOT0_ALT + && r_type <= R_XTENSA_SLOT14_ALT); +} + + +bfd_boolean +is_operand_relocation (int r_type) +{ + switch (r_type) + { + case R_XTENSA_OP0: + case R_XTENSA_OP1: + case R_XTENSA_OP2: + return TRUE; + + default: + if (r_type >= R_XTENSA_SLOT0_OP && r_type <= R_XTENSA_SLOT14_OP) + return TRUE; + if (r_type >= R_XTENSA_SLOT0_ALT && r_type <= R_XTENSA_SLOT14_ALT) + return TRUE; + break; + } + + return FALSE; +} + + +#define MIN_INSN_LENGTH 2 + +/* Return 0 if it fails to decode. */ + +bfd_size_type +insn_decode_len (bfd_byte *contents, + bfd_size_type content_len, + bfd_size_type offset) +{ + int insn_len; + xtensa_isa isa = xtensa_default_isa; + xtensa_format fmt; + static xtensa_insnbuf ibuff = NULL; + + if (offset + MIN_INSN_LENGTH > content_len) + return 0; + + if (ibuff == NULL) + ibuff = xtensa_insnbuf_alloc (isa); + xtensa_insnbuf_from_chars (isa, ibuff, &contents[offset], + content_len - offset); + fmt = xtensa_format_decode (isa, ibuff); + if (fmt == XTENSA_UNDEFINED) + return 0; + insn_len = xtensa_format_length (isa, fmt); + if (insn_len == XTENSA_UNDEFINED) + return 0; + return insn_len; +} + + +/* Decode the opcode for a single slot instruction. + Return 0 if it fails to decode or the instruction is multi-slot. */ + +xtensa_opcode +insn_decode_opcode (bfd_byte *contents, + bfd_size_type content_len, + bfd_size_type offset, + int slot) +{ + xtensa_isa isa = xtensa_default_isa; + xtensa_format fmt; + static xtensa_insnbuf insnbuf = NULL; + static xtensa_insnbuf slotbuf = NULL; + + if (offset + MIN_INSN_LENGTH > content_len) + return XTENSA_UNDEFINED; + + if (insnbuf == NULL) + { + insnbuf = xtensa_insnbuf_alloc (isa); + slotbuf = xtensa_insnbuf_alloc (isa); + } + + xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset], + content_len - offset); + fmt = xtensa_format_decode (isa, insnbuf); + if (fmt == XTENSA_UNDEFINED) + return XTENSA_UNDEFINED; + + if (slot >= xtensa_format_num_slots (isa, fmt)) + return XTENSA_UNDEFINED; + + xtensa_format_get_slot (isa, fmt, slot, insnbuf, slotbuf); + return xtensa_opcode_decode (isa, fmt, slot, slotbuf); +} + + +/* The offset is the offset in the contents. + The address is the address of that offset. */ + +static bfd_boolean +check_branch_target_aligned (bfd_byte *contents, + bfd_size_type content_length, + bfd_vma offset, + bfd_vma address) +{ + bfd_size_type insn_len = insn_decode_len (contents, content_length, offset); + if (insn_len == 0) + return FALSE; + return check_branch_target_aligned_address (address, insn_len); +} + + +static bfd_boolean +check_loop_aligned (bfd_byte *contents, + bfd_size_type content_length, + bfd_vma offset, + bfd_vma address) +{ + bfd_size_type loop_len, insn_len; + xtensa_opcode opcode; + + opcode = insn_decode_opcode (contents, content_length, offset, 0); + if (opcode == XTENSA_UNDEFINED + || xtensa_opcode_is_loop (xtensa_default_isa, opcode) != 1) + { + BFD_ASSERT (FALSE); + return FALSE; + } + + loop_len = insn_decode_len (contents, content_length, offset); + insn_len = insn_decode_len (contents, content_length, offset + loop_len); + if (loop_len == 0 || insn_len == 0) + { + BFD_ASSERT (FALSE); + return FALSE; + } + + return check_branch_target_aligned_address (address + loop_len, insn_len); +} + + +static bfd_boolean +check_branch_target_aligned_address (bfd_vma addr, int len) +{ + if (len == 8) + return (addr % 8 == 0); + return ((addr >> 2) == ((addr + len - 1) >> 2)); +} + + +/* Instruction widening and narrowing. */ + +/* When FLIX is available we need to access certain instructions only + when they are 16-bit or 24-bit instructions. This table caches + information about such instructions by walking through all the + opcodes and finding the smallest single-slot format into which each + can be encoded. */ + +static xtensa_format *op_single_fmt_table = NULL; + + +static void +init_op_single_format_table (void) +{ + xtensa_isa isa = xtensa_default_isa; + xtensa_insnbuf ibuf; + xtensa_opcode opcode; + xtensa_format fmt; + int num_opcodes; + + if (op_single_fmt_table) + return; + + ibuf = xtensa_insnbuf_alloc (isa); + num_opcodes = xtensa_isa_num_opcodes (isa); + + op_single_fmt_table = (xtensa_format *) + bfd_malloc (sizeof (xtensa_format) * num_opcodes); + for (opcode = 0; opcode < num_opcodes; opcode++) + { + op_single_fmt_table[opcode] = XTENSA_UNDEFINED; + for (fmt = 0; fmt < xtensa_isa_num_formats (isa); fmt++) + { + if (xtensa_format_num_slots (isa, fmt) == 1 + && xtensa_opcode_encode (isa, fmt, 0, ibuf, opcode) == 0) + { + xtensa_opcode old_fmt = op_single_fmt_table[opcode]; + int fmt_length = xtensa_format_length (isa, fmt); + if (old_fmt == XTENSA_UNDEFINED + || fmt_length < xtensa_format_length (isa, old_fmt)) + op_single_fmt_table[opcode] = fmt; + } + } + } + xtensa_insnbuf_free (isa, ibuf); +} + + +static xtensa_format +get_single_format (xtensa_opcode opcode) +{ + init_op_single_format_table (); + return op_single_fmt_table[opcode]; +} + + +/* For the set of narrowable instructions we do NOT include the + narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities + involved during linker relaxation that may require these to + re-expand in some conditions. Also, the narrowing "or" -> mov.n + requires special case code to ensure it only works when op1 == op2. */ + +struct string_pair +{ + const char *wide; + const char *narrow; +}; + +struct string_pair narrowable[] = +{ + { "add", "add.n" }, + { "addi", "addi.n" }, + { "addmi", "addi.n" }, + { "l32i", "l32i.n" }, + { "movi", "movi.n" }, + { "ret", "ret.n" }, + { "retw", "retw.n" }, + { "s32i", "s32i.n" }, + { "or", "mov.n" } /* special case only when op1 == op2 */ +}; + +struct string_pair widenable[] = +{ + { "add", "add.n" }, + { "addi", "addi.n" }, + { "addmi", "addi.n" }, + { "beqz", "beqz.n" }, + { "bnez", "bnez.n" }, + { "l32i", "l32i.n" }, + { "movi", "movi.n" }, + { "ret", "ret.n" }, + { "retw", "retw.n" }, + { "s32i", "s32i.n" }, + { "or", "mov.n" } /* special case only when op1 == op2 */ +}; + + +/* Check if an instruction can be "narrowed", i.e., changed from a standard + 3-byte instruction to a 2-byte "density" instruction. If it is valid, + return the instruction buffer holding the narrow instruction. Otherwise, + return 0. The set of valid narrowing are specified by a string table + but require some special case operand checks in some cases. */ + +static xtensa_insnbuf +can_narrow_instruction (xtensa_insnbuf slotbuf, + xtensa_format fmt, + xtensa_opcode opcode) +{ + xtensa_isa isa = xtensa_default_isa; + xtensa_format o_fmt; + unsigned opi; + + static xtensa_insnbuf o_insnbuf = NULL; + static xtensa_insnbuf o_slotbuf = NULL; + + if (o_insnbuf == NULL) + { + o_insnbuf = xtensa_insnbuf_alloc (isa); + o_slotbuf = xtensa_insnbuf_alloc (isa); + } + + for (opi = 0; opi < (sizeof (narrowable)/sizeof (struct string_pair)); opi++) + { + bfd_boolean is_or = (strcmp ("or", narrowable[opi].wide) == 0); + + if (opcode == xtensa_opcode_lookup (isa, narrowable[opi].wide)) + { + uint32 value, newval; + int i, operand_count, o_operand_count; + xtensa_opcode o_opcode; + + /* Address does not matter in this case. We might need to + fix it to handle branches/jumps. */ + bfd_vma self_address = 0; + + o_opcode = xtensa_opcode_lookup (isa, narrowable[opi].narrow); + if (o_opcode == XTENSA_UNDEFINED) + return 0; + o_fmt = get_single_format (o_opcode); + if (o_fmt == XTENSA_UNDEFINED) + return 0; + + if (xtensa_format_length (isa, fmt) != 3 + || xtensa_format_length (isa, o_fmt) != 2) + return 0; + + xtensa_format_encode (isa, o_fmt, o_insnbuf); + operand_count = xtensa_opcode_num_operands (isa, opcode); + o_operand_count = xtensa_opcode_num_operands (isa, o_opcode); + + if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0) + return 0; + + if (!is_or) + { + if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count) + return 0; + } + else + { + uint32 rawval0, rawval1, rawval2; + + if (o_operand_count + 1 != operand_count + || xtensa_operand_get_field (isa, opcode, 0, + fmt, 0, slotbuf, &rawval0) != 0 + || xtensa_operand_get_field (isa, opcode, 1, + fmt, 0, slotbuf, &rawval1) != 0 + || xtensa_operand_get_field (isa, opcode, 2, + fmt, 0, slotbuf, &rawval2) != 0 + || rawval1 != rawval2 + || rawval0 == rawval1 /* it is a nop */) + return 0; + } + + for (i = 0; i < o_operand_count; ++i) + { + if (xtensa_operand_get_field (isa, opcode, i, fmt, 0, + slotbuf, &value) + || xtensa_operand_decode (isa, opcode, i, &value)) + return 0; + + /* PC-relative branches need adjustment, but + the PC-rel operand will always have a relocation. */ + newval = value; + if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval, + self_address) + || xtensa_operand_encode (isa, o_opcode, i, &newval) + || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0, + o_slotbuf, newval)) + return 0; + } + + if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf)) + return 0; + + return o_insnbuf; + } + } + return 0; +} + + +/* Attempt to narrow an instruction. If the narrowing is valid, perform + the action in-place directly into the contents and return TRUE. Otherwise, + the return value is FALSE and the contents are not modified. */ + +static bfd_boolean +narrow_instruction (bfd_byte *contents, + bfd_size_type content_length, + bfd_size_type offset) +{ + xtensa_opcode opcode; + bfd_size_type insn_len; + xtensa_isa isa = xtensa_default_isa; + xtensa_format fmt; + xtensa_insnbuf o_insnbuf; + + static xtensa_insnbuf insnbuf = NULL; + static xtensa_insnbuf slotbuf = NULL; + + if (insnbuf == NULL) + { + insnbuf = xtensa_insnbuf_alloc (isa); + slotbuf = xtensa_insnbuf_alloc (isa); + } + + BFD_ASSERT (offset < content_length); + + if (content_length < 2) + return FALSE; + + /* We will hand-code a few of these for a little while. + These have all been specified in the assembler aleady. */ + xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset], + content_length - offset); + fmt = xtensa_format_decode (isa, insnbuf); + if (xtensa_format_num_slots (isa, fmt) != 1) + return FALSE; + + if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0) + return FALSE; + + opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf); + if (opcode == XTENSA_UNDEFINED) + return FALSE; + insn_len = xtensa_format_length (isa, fmt); + if (insn_len > content_length) + return FALSE; + + o_insnbuf = can_narrow_instruction (slotbuf, fmt, opcode); + if (o_insnbuf) + { + xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset, + content_length - offset); + return TRUE; + } + + return FALSE; +} + + +/* Check if an instruction can be "widened", i.e., changed from a 2-byte + "density" instruction to a standard 3-byte instruction. If it is valid, + return the instruction buffer holding the wide instruction. Otherwise, + return 0. The set of valid widenings are specified by a string table + but require some special case operand checks in some cases. */ + +static xtensa_insnbuf +can_widen_instruction (xtensa_insnbuf slotbuf, + xtensa_format fmt, + xtensa_opcode opcode) +{ + xtensa_isa isa = xtensa_default_isa; + xtensa_format o_fmt; + unsigned opi; + + static xtensa_insnbuf o_insnbuf = NULL; + static xtensa_insnbuf o_slotbuf = NULL; + + if (o_insnbuf == NULL) + { + o_insnbuf = xtensa_insnbuf_alloc (isa); + o_slotbuf = xtensa_insnbuf_alloc (isa); + } + + for (opi = 0; opi < (sizeof (widenable)/sizeof (struct string_pair)); opi++) + { + bfd_boolean is_or = (strcmp ("or", widenable[opi].wide) == 0); + bfd_boolean is_branch = (strcmp ("beqz", widenable[opi].wide) == 0 + || strcmp ("bnez", widenable[opi].wide) == 0); + + if (opcode == xtensa_opcode_lookup (isa, widenable[opi].narrow)) + { + uint32 value, newval; + int i, operand_count, o_operand_count, check_operand_count; + xtensa_opcode o_opcode; + + /* Address does not matter in this case. We might need to fix it + to handle branches/jumps. */ + bfd_vma self_address = 0; + + o_opcode = xtensa_opcode_lookup (isa, widenable[opi].wide); + if (o_opcode == XTENSA_UNDEFINED) + return 0; + o_fmt = get_single_format (o_opcode); + if (o_fmt == XTENSA_UNDEFINED) + return 0; + + if (xtensa_format_length (isa, fmt) != 2 + || xtensa_format_length (isa, o_fmt) != 3) + return 0; + + xtensa_format_encode (isa, o_fmt, o_insnbuf); + operand_count = xtensa_opcode_num_operands (isa, opcode); + o_operand_count = xtensa_opcode_num_operands (isa, o_opcode); + check_operand_count = o_operand_count; + + if (xtensa_opcode_encode (isa, o_fmt, 0, o_slotbuf, o_opcode) != 0) + return 0; + + if (!is_or) + { + if (xtensa_opcode_num_operands (isa, o_opcode) != operand_count) + return 0; + } + else + { + uint32 rawval0, rawval1; + + if (o_operand_count != operand_count + 1 + || xtensa_operand_get_field (isa, opcode, 0, + fmt, 0, slotbuf, &rawval0) != 0 + || xtensa_operand_get_field (isa, opcode, 1, + fmt, 0, slotbuf, &rawval1) != 0 + || rawval0 == rawval1 /* it is a nop */) + return 0; + } + if (is_branch) + check_operand_count--; + + for (i = 0; i < check_operand_count; i++) + { + int new_i = i; + if (is_or && i == o_operand_count - 1) + new_i = i - 1; + if (xtensa_operand_get_field (isa, opcode, new_i, fmt, 0, + slotbuf, &value) + || xtensa_operand_decode (isa, opcode, new_i, &value)) + return 0; + + /* PC-relative branches need adjustment, but + the PC-rel operand will always have a relocation. */ + newval = value; + if (xtensa_operand_do_reloc (isa, o_opcode, i, &newval, + self_address) + || xtensa_operand_encode (isa, o_opcode, i, &newval) + || xtensa_operand_set_field (isa, o_opcode, i, o_fmt, 0, + o_slotbuf, newval)) + return 0; + } + + if (xtensa_format_set_slot (isa, o_fmt, 0, o_insnbuf, o_slotbuf)) + return 0; + + return o_insnbuf; + } + } + return 0; +} + + +/* Attempt to widen an instruction. If the widening is valid, perform + the action in-place directly into the contents and return TRUE. Otherwise, + the return value is FALSE and the contents are not modified. */ + +static bfd_boolean +widen_instruction (bfd_byte *contents, + bfd_size_type content_length, + bfd_size_type offset) +{ + xtensa_opcode opcode; + bfd_size_type insn_len; + xtensa_isa isa = xtensa_default_isa; + xtensa_format fmt; + xtensa_insnbuf o_insnbuf; + + static xtensa_insnbuf insnbuf = NULL; + static xtensa_insnbuf slotbuf = NULL; + + if (insnbuf == NULL) + { + insnbuf = xtensa_insnbuf_alloc (isa); + slotbuf = xtensa_insnbuf_alloc (isa); + } + + BFD_ASSERT (offset < content_length); + + if (content_length < 2) + return FALSE; + + /* We will hand-code a few of these for a little while. + These have all been specified in the assembler aleady. */ + xtensa_insnbuf_from_chars (isa, insnbuf, &contents[offset], + content_length - offset); + fmt = xtensa_format_decode (isa, insnbuf); + if (xtensa_format_num_slots (isa, fmt) != 1) + return FALSE; + + if (xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf) != 0) + return FALSE; + + opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf); + if (opcode == XTENSA_UNDEFINED) + return FALSE; + insn_len = xtensa_format_length (isa, fmt); + if (insn_len > content_length) + return FALSE; + + o_insnbuf = can_widen_instruction (slotbuf, fmt, opcode); + if (o_insnbuf) + { + xtensa_insnbuf_to_chars (isa, o_insnbuf, contents + offset, + content_length - offset); + return TRUE; + } + return FALSE; +} + + +/* Code for transforming CALLs at link-time. */ + +static bfd_reloc_status_type +elf_xtensa_do_asm_simplify (bfd_byte *contents, + bfd_vma address, + bfd_vma content_length, + char **error_message) +{ + static xtensa_insnbuf insnbuf = NULL; + static xtensa_insnbuf slotbuf = NULL; + xtensa_format core_format = XTENSA_UNDEFINED; + xtensa_opcode opcode; + xtensa_opcode direct_call_opcode; + xtensa_isa isa = xtensa_default_isa; + bfd_byte *chbuf = contents + address; + int opn; + + if (insnbuf == NULL) + { + insnbuf = xtensa_insnbuf_alloc (isa); + slotbuf = xtensa_insnbuf_alloc (isa); + } + + if (content_length < address) + { + *error_message = _("Attempt to convert L32R/CALLX to CALL failed"); + return bfd_reloc_other; + } + + opcode = get_expanded_call_opcode (chbuf, content_length - address, 0); + direct_call_opcode = swap_callx_for_call_opcode (opcode); + if (direct_call_opcode == XTENSA_UNDEFINED) + { + *error_message = _("Attempt to convert L32R/CALLX to CALL failed"); + return bfd_reloc_other; + } + + /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */ + core_format = xtensa_format_lookup (isa, "x24"); + opcode = xtensa_opcode_lookup (isa, "or"); + xtensa_opcode_encode (isa, core_format, 0, slotbuf, opcode); + for (opn = 0; opn < 3; opn++) + { + uint32 regno = 1; + xtensa_operand_encode (isa, opcode, opn, ®no); + xtensa_operand_set_field (isa, opcode, opn, core_format, 0, + slotbuf, regno); + } + xtensa_format_encode (isa, core_format, insnbuf); + xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf); + xtensa_insnbuf_to_chars (isa, insnbuf, chbuf, content_length - address); + + /* Assemble a CALL ("callN 0") into the 3 byte offset. */ + xtensa_opcode_encode (isa, core_format, 0, slotbuf, direct_call_opcode); + xtensa_operand_set_field (isa, opcode, 0, core_format, 0, slotbuf, 0); + + xtensa_format_encode (isa, core_format, insnbuf); + xtensa_format_set_slot (isa, core_format, 0, insnbuf, slotbuf); + xtensa_insnbuf_to_chars (isa, insnbuf, chbuf + 3, + content_length - address - 3); + + return bfd_reloc_ok; +} + + +static bfd_reloc_status_type +contract_asm_expansion (bfd_byte *contents, + bfd_vma content_length, + Elf_Internal_Rela *irel, + char **error_message) +{ + bfd_reloc_status_type retval = + elf_xtensa_do_asm_simplify (contents, irel->r_offset, content_length, + error_message); + + if (retval != bfd_reloc_ok) + return bfd_reloc_dangerous; + + /* Update the irel->r_offset field so that the right immediate and + the right instruction are modified during the relocation. */ + irel->r_offset += 3; + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_XTENSA_SLOT0_OP); + return bfd_reloc_ok; +} + + +static xtensa_opcode +swap_callx_for_call_opcode (xtensa_opcode opcode) +{ + init_call_opcodes (); + + if (opcode == callx0_op) return call0_op; + if (opcode == callx4_op) return call4_op; + if (opcode == callx8_op) return call8_op; + if (opcode == callx12_op) return call12_op; + + /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */ + return XTENSA_UNDEFINED; +} + + +/* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN; + CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode. + If not, return XTENSA_UNDEFINED. */ + +#define L32R_TARGET_REG_OPERAND 0 +#define CONST16_TARGET_REG_OPERAND 0 +#define CALLN_SOURCE_OPERAND 0 + +static xtensa_opcode +get_expanded_call_opcode (bfd_byte *buf, int bufsize, bfd_boolean *p_uses_l32r) +{ + static xtensa_insnbuf insnbuf = NULL; + static xtensa_insnbuf slotbuf = NULL; + xtensa_format fmt; + xtensa_opcode opcode; + xtensa_isa isa = xtensa_default_isa; + uint32 regno, const16_regno, call_regno; + int offset = 0; + + if (insnbuf == NULL) + { + insnbuf = xtensa_insnbuf_alloc (isa); + slotbuf = xtensa_insnbuf_alloc (isa); + } + + xtensa_insnbuf_from_chars (isa, insnbuf, buf, bufsize); + fmt = xtensa_format_decode (isa, insnbuf); + if (fmt == XTENSA_UNDEFINED + || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf)) + return XTENSA_UNDEFINED; + + opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf); + if (opcode == XTENSA_UNDEFINED) + return XTENSA_UNDEFINED; + + if (opcode == get_l32r_opcode ()) + { + if (p_uses_l32r) + *p_uses_l32r = TRUE; + if (xtensa_operand_get_field (isa, opcode, L32R_TARGET_REG_OPERAND, + fmt, 0, slotbuf, ®no) + || xtensa_operand_decode (isa, opcode, L32R_TARGET_REG_OPERAND, + ®no)) + return XTENSA_UNDEFINED; + } + else if (opcode == get_const16_opcode ()) + { + if (p_uses_l32r) + *p_uses_l32r = FALSE; + if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND, + fmt, 0, slotbuf, ®no) + || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND, + ®no)) + return XTENSA_UNDEFINED; + + /* Check that the next instruction is also CONST16. */ + offset += xtensa_format_length (isa, fmt); + xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset); + fmt = xtensa_format_decode (isa, insnbuf); + if (fmt == XTENSA_UNDEFINED + || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf)) + return XTENSA_UNDEFINED; + opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf); + if (opcode != get_const16_opcode ()) + return XTENSA_UNDEFINED; + + if (xtensa_operand_get_field (isa, opcode, CONST16_TARGET_REG_OPERAND, + fmt, 0, slotbuf, &const16_regno) + || xtensa_operand_decode (isa, opcode, CONST16_TARGET_REG_OPERAND, + &const16_regno) + || const16_regno != regno) + return XTENSA_UNDEFINED; + } + else + return XTENSA_UNDEFINED; + + /* Next instruction should be an CALLXn with operand 0 == regno. */ + offset += xtensa_format_length (isa, fmt); + xtensa_insnbuf_from_chars (isa, insnbuf, buf + offset, bufsize - offset); + fmt = xtensa_format_decode (isa, insnbuf); + if (fmt == XTENSA_UNDEFINED + || xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf)) + return XTENSA_UNDEFINED; + opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf); + if (opcode == XTENSA_UNDEFINED + || !is_indirect_call_opcode (opcode)) + return XTENSA_UNDEFINED; + + if (xtensa_operand_get_field (isa, opcode, CALLN_SOURCE_OPERAND, + fmt, 0, slotbuf, &call_regno) + || xtensa_operand_decode (isa, opcode, CALLN_SOURCE_OPERAND, + &call_regno)) + return XTENSA_UNDEFINED; + + if (call_regno != regno) + return XTENSA_UNDEFINED; + + return opcode; +} + + +/* Data structures used during relaxation. */ + +/* r_reloc: relocation values. */ + +/* Through the relaxation process, we need to keep track of the values + that will result from evaluating relocations. The standard ELF + relocation structure is not sufficient for this purpose because we're + operating on multiple input files at once, so we need to know which + input file a relocation refers to. The r_reloc structure thus + records both the input file (bfd) and ELF relocation. + + For efficiency, an r_reloc also contains a "target_offset" field to + cache the target-section-relative offset value that is represented by + the relocation. + + The r_reloc also contains a virtual offset that allows multiple + inserted literals to be placed at the same "address" with + different offsets. */ + +typedef struct r_reloc_struct r_reloc; + +struct r_reloc_struct +{ + bfd *abfd; + Elf_Internal_Rela rela; + bfd_vma target_offset; + bfd_vma virtual_offset; +}; + + +/* The r_reloc structure is included by value in literal_value, but not + every literal_value has an associated relocation -- some are simple + constants. In such cases, we set all the fields in the r_reloc + struct to zero. The r_reloc_is_const function should be used to + detect this case. */ + +static bfd_boolean +r_reloc_is_const (const r_reloc *r_rel) +{ + return (r_rel->abfd == NULL); +} + + +static bfd_vma +r_reloc_get_target_offset (const r_reloc *r_rel) +{ + bfd_vma target_offset; + unsigned long r_symndx; + + BFD_ASSERT (!r_reloc_is_const (r_rel)); + r_symndx = ELF32_R_SYM (r_rel->rela.r_info); + target_offset = get_elf_r_symndx_offset (r_rel->abfd, r_symndx); + return (target_offset + r_rel->rela.r_addend); +} + + +static struct elf_link_hash_entry * +r_reloc_get_hash_entry (const r_reloc *r_rel) +{ + unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info); + return get_elf_r_symndx_hash_entry (r_rel->abfd, r_symndx); +} + + +static asection * +r_reloc_get_section (const r_reloc *r_rel) +{ + unsigned long r_symndx = ELF32_R_SYM (r_rel->rela.r_info); + return get_elf_r_symndx_section (r_rel->abfd, r_symndx); +} + + +static bfd_boolean +r_reloc_is_defined (const r_reloc *r_rel) +{ + asection *sec; + if (r_rel == NULL) + return FALSE; + + sec = r_reloc_get_section (r_rel); + if (sec == bfd_abs_section_ptr + || sec == bfd_com_section_ptr + || sec == bfd_und_section_ptr) + return FALSE; + return TRUE; +} + + +static void +r_reloc_init (r_reloc *r_rel, + bfd *abfd, + Elf_Internal_Rela *irel, + bfd_byte *contents, + bfd_size_type content_length) +{ + int r_type; + reloc_howto_type *howto; + + if (irel) + { + r_rel->rela = *irel; + r_rel->abfd = abfd; + r_rel->target_offset = r_reloc_get_target_offset (r_rel); + r_rel->virtual_offset = 0; + r_type = ELF32_R_TYPE (r_rel->rela.r_info); + howto = &elf_howto_table[r_type]; + if (howto->partial_inplace) + { + bfd_vma inplace_val; + BFD_ASSERT (r_rel->rela.r_offset < content_length); + + inplace_val = bfd_get_32 (abfd, &contents[r_rel->rela.r_offset]); + r_rel->target_offset += inplace_val; + } + } + else + memset (r_rel, 0, sizeof (r_reloc)); +} + + +#if DEBUG + +static void +print_r_reloc (FILE *fp, const r_reloc *r_rel) +{ + if (r_reloc_is_defined (r_rel)) + { + asection *sec = r_reloc_get_section (r_rel); + fprintf (fp, " %s(%s + ", sec->owner->filename, sec->name); + } + else if (r_reloc_get_hash_entry (r_rel)) + fprintf (fp, " %s + ", r_reloc_get_hash_entry (r_rel)->root.root.string); + else + fprintf (fp, " ?? + "); + + fprintf_vma (fp, r_rel->target_offset); + if (r_rel->virtual_offset) + { + fprintf (fp, " + "); + fprintf_vma (fp, r_rel->virtual_offset); + } + + fprintf (fp, ")"); +} + +#endif /* DEBUG */ + + +/* source_reloc: relocations that reference literals. */ + +/* To determine whether literals can be coalesced, we need to first + record all the relocations that reference the literals. The + source_reloc structure below is used for this purpose. The + source_reloc entries are kept in a per-literal-section array, sorted + by offset within the literal section (i.e., target offset). + + The source_sec and r_rel.rela.r_offset fields identify the source of + the relocation. The r_rel field records the relocation value, i.e., + the offset of the literal being referenced. The opnd field is needed + to determine the range of the immediate field to which the relocation + applies, so we can determine whether another literal with the same + value is within range. The is_null field is true when the relocation + is being removed (e.g., when an L32R is being removed due to a CALLX + that is converted to a direct CALL). */ + +typedef struct source_reloc_struct source_reloc; + +struct source_reloc_struct +{ + asection *source_sec; + r_reloc r_rel; + xtensa_opcode opcode; + int opnd; + bfd_boolean is_null; + bfd_boolean is_abs_literal; +}; + + +static void +init_source_reloc (source_reloc *reloc, + asection *source_sec, + const r_reloc *r_rel, + xtensa_opcode opcode, + int opnd, + bfd_boolean is_abs_literal) +{ + reloc->source_sec = source_sec; + reloc->r_rel = *r_rel; + reloc->opcode = opcode; + reloc->opnd = opnd; + reloc->is_null = FALSE; + reloc->is_abs_literal = is_abs_literal; +} + + +/* Find the source_reloc for a particular source offset and relocation + type. Note that the array is sorted by _target_ offset, so this is + just a linear search. */ + +static source_reloc * +find_source_reloc (source_reloc *src_relocs, + int src_count, + asection *sec, + Elf_Internal_Rela *irel) +{ + int i; + + for (i = 0; i < src_count; i++) + { + if (src_relocs[i].source_sec == sec + && src_relocs[i].r_rel.rela.r_offset == irel->r_offset + && (ELF32_R_TYPE (src_relocs[i].r_rel.rela.r_info) + == ELF32_R_TYPE (irel->r_info))) + return &src_relocs[i]; + } + + return NULL; +} + + +static int +source_reloc_compare (const void *ap, const void *bp) +{ + const source_reloc *a = (const source_reloc *) ap; + const source_reloc *b = (const source_reloc *) bp; + + if (a->r_rel.target_offset != b->r_rel.target_offset) + return (a->r_rel.target_offset - b->r_rel.target_offset); + + /* We don't need to sort on these criteria for correctness, + but enforcing a more strict ordering prevents unstable qsort + from behaving differently with different implementations. + Without the code below we get correct but different results + on Solaris 2.7 and 2.8. We would like to always produce the + same results no matter the host. */ + + if ((!a->is_null) - (!b->is_null)) + return ((!a->is_null) - (!b->is_null)); + return internal_reloc_compare (&a->r_rel.rela, &b->r_rel.rela); +} + + +/* Literal values and value hash tables. */ + +/* Literals with the same value can be coalesced. The literal_value + structure records the value of a literal: the "r_rel" field holds the + information from the relocation on the literal (if there is one) and + the "value" field holds the contents of the literal word itself. + + The value_map structure records a literal value along with the + location of a literal holding that value. The value_map hash table + is indexed by the literal value, so that we can quickly check if a + particular literal value has been seen before and is thus a candidate + for coalescing. */ + +typedef struct literal_value_struct literal_value; +typedef struct value_map_struct value_map; +typedef struct value_map_hash_table_struct value_map_hash_table; + +struct literal_value_struct +{ + r_reloc r_rel; + unsigned long value; + bfd_boolean is_abs_literal; +}; + +struct value_map_struct +{ + literal_value val; /* The literal value. */ + r_reloc loc; /* Location of the literal. */ + value_map *next; +}; + +struct value_map_hash_table_struct +{ + unsigned bucket_count; + value_map **buckets; + unsigned count; + bfd_boolean has_last_loc; + r_reloc last_loc; +}; + + +static void +init_literal_value (literal_value *lit, + const r_reloc *r_rel, + unsigned long value, + bfd_boolean is_abs_literal) +{ + lit->r_rel = *r_rel; + lit->value = value; + lit->is_abs_literal = is_abs_literal; +} + + +static bfd_boolean +literal_value_equal (const literal_value *src1, + const literal_value *src2, + bfd_boolean final_static_link) +{ + struct elf_link_hash_entry *h1, *h2; + + if (r_reloc_is_const (&src1->r_rel) != r_reloc_is_const (&src2->r_rel)) + return FALSE; + + if (r_reloc_is_const (&src1->r_rel)) + return (src1->value == src2->value); + + if (ELF32_R_TYPE (src1->r_rel.rela.r_info) + != ELF32_R_TYPE (src2->r_rel.rela.r_info)) + return FALSE; + + if (src1->r_rel.target_offset != src2->r_rel.target_offset) + return FALSE; + + if (src1->r_rel.virtual_offset != src2->r_rel.virtual_offset) + return FALSE; + + if (src1->value != src2->value) + return FALSE; + + /* Now check for the same section (if defined) or the same elf_hash + (if undefined or weak). */ + h1 = r_reloc_get_hash_entry (&src1->r_rel); + h2 = r_reloc_get_hash_entry (&src2->r_rel); + if (r_reloc_is_defined (&src1->r_rel) + && (final_static_link + || ((!h1 || h1->root.type != bfd_link_hash_defweak) + && (!h2 || h2->root.type != bfd_link_hash_defweak)))) + { + if (r_reloc_get_section (&src1->r_rel) + != r_reloc_get_section (&src2->r_rel)) + return FALSE; + } + else + { + /* Require that the hash entries (i.e., symbols) be identical. */ + if (h1 != h2 || h1 == 0) + return FALSE; + } + + if (src1->is_abs_literal != src2->is_abs_literal) + return FALSE; + + return TRUE; +} + + +/* Must be power of 2. */ +#define INITIAL_HASH_RELOC_BUCKET_COUNT 1024 + +static value_map_hash_table * +value_map_hash_table_init (void) +{ + value_map_hash_table *values; + + values = (value_map_hash_table *) + bfd_zmalloc (sizeof (value_map_hash_table)); + values->bucket_count = INITIAL_HASH_RELOC_BUCKET_COUNT; + values->count = 0; + values->buckets = (value_map **) + bfd_zmalloc (sizeof (value_map *) * values->bucket_count); + if (values->buckets == NULL) + { + free (values); + return NULL; + } + values->has_last_loc = FALSE; + + return values; +} + + +static void +value_map_hash_table_delete (value_map_hash_table *table) +{ + free (table->buckets); + free (table); +} + + +static unsigned +hash_bfd_vma (bfd_vma val) +{ + return (val >> 2) + (val >> 10); +} + + +static unsigned +literal_value_hash (const literal_value *src) +{ + unsigned hash_val; + + hash_val = hash_bfd_vma (src->value); + if (!r_reloc_is_const (&src->r_rel)) + { + void *sec_or_hash; + + hash_val += hash_bfd_vma (src->is_abs_literal * 1000); + hash_val += hash_bfd_vma (src->r_rel.target_offset); + hash_val += hash_bfd_vma (src->r_rel.virtual_offset); + + /* Now check for the same section and the same elf_hash. */ + if (r_reloc_is_defined (&src->r_rel)) + sec_or_hash = r_reloc_get_section (&src->r_rel); + else + sec_or_hash = r_reloc_get_hash_entry (&src->r_rel); + hash_val += hash_bfd_vma ((bfd_vma) (size_t) sec_or_hash); + } + return hash_val; +} + + +/* Check if the specified literal_value has been seen before. */ + +static value_map * +value_map_get_cached_value (value_map_hash_table *map, + const literal_value *val, + bfd_boolean final_static_link) +{ + value_map *map_e; + value_map *bucket; + unsigned idx; + + idx = literal_value_hash (val); + idx = idx & (map->bucket_count - 1); + bucket = map->buckets[idx]; + for (map_e = bucket; map_e; map_e = map_e->next) + { + if (literal_value_equal (&map_e->val, val, final_static_link)) + return map_e; + } + return NULL; +} + + +/* Record a new literal value. It is illegal to call this if VALUE + already has an entry here. */ + +static value_map * +add_value_map (value_map_hash_table *map, + const literal_value *val, + const r_reloc *loc, + bfd_boolean final_static_link) +{ + value_map **bucket_p; + unsigned idx; + + value_map *val_e = (value_map *) bfd_zmalloc (sizeof (value_map)); + if (val_e == NULL) + { + bfd_set_error (bfd_error_no_memory); + return NULL; + } + + BFD_ASSERT (!value_map_get_cached_value (map, val, final_static_link)); + val_e->val = *val; + val_e->loc = *loc; + + idx = literal_value_hash (val); + idx = idx & (map->bucket_count - 1); + bucket_p = &map->buckets[idx]; + + val_e->next = *bucket_p; + *bucket_p = val_e; + map->count++; + /* FIXME: Consider resizing the hash table if we get too many entries. */ + + return val_e; +} + + +/* Lists of text actions (ta_) for narrowing, widening, longcall + conversion, space fill, code & literal removal, etc. */ + +/* The following text actions are generated: + + "ta_remove_insn" remove an instruction or instructions + "ta_remove_longcall" convert longcall to call + "ta_convert_longcall" convert longcall to nop/call + "ta_narrow_insn" narrow a wide instruction + "ta_widen" widen a narrow instruction + "ta_fill" add fill or remove fill + removed < 0 is a fill; branches to the fill address will be + changed to address + fill size (e.g., address - removed) + removed >= 0 branches to the fill address will stay unchanged + "ta_remove_literal" remove a literal; this action is + indicated when a literal is removed + or replaced. + "ta_add_literal" insert a new literal; this action is + indicated when a literal has been moved. + It may use a virtual_offset because + multiple literals can be placed at the + same location. + + For each of these text actions, we also record the number of bytes + removed by performing the text action. In the case of a "ta_widen" + or a "ta_fill" that adds space, the removed_bytes will be negative. */ + +typedef struct text_action_struct text_action; +typedef struct text_action_list_struct text_action_list; +typedef enum text_action_enum_t text_action_t; + +enum text_action_enum_t +{ + ta_none, + ta_remove_insn, /* removed = -size */ + ta_remove_longcall, /* removed = -size */ + ta_convert_longcall, /* removed = 0 */ + ta_narrow_insn, /* removed = -1 */ + ta_widen_insn, /* removed = +1 */ + ta_fill, /* removed = +size */ + ta_remove_literal, + ta_add_literal +}; + + +/* Structure for a text action record. */ +struct text_action_struct +{ + text_action_t action; + asection *sec; /* Optional */ + bfd_vma offset; + bfd_vma virtual_offset; /* Zero except for adding literals. */ + int removed_bytes; + literal_value value; /* Only valid when adding literals. */ + + text_action *next; +}; + + +/* List of all of the actions taken on a text section. */ +struct text_action_list_struct +{ + text_action *head; +}; + + +static text_action * +find_fill_action (text_action_list *l, asection *sec, bfd_vma offset) +{ + text_action **m_p; + + /* It is not necessary to fill at the end of a section. */ + if (sec->size == offset) + return NULL; + + for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next) + { + text_action *t = *m_p; + /* When the action is another fill at the same address, + just increase the size. */ + if (t->offset == offset && t->action == ta_fill) + return t; + } + return NULL; +} + + +static int +compute_removed_action_diff (const text_action *ta, + asection *sec, + bfd_vma offset, + int removed, + int removable_space) +{ + int new_removed; + int current_removed = 0; + + if (ta) + current_removed = ta->removed_bytes; + + BFD_ASSERT (ta == NULL || ta->offset == offset); + BFD_ASSERT (ta == NULL || ta->action == ta_fill); + + /* It is not necessary to fill at the end of a section. Clean this up. */ + if (sec->size == offset) + new_removed = removable_space - 0; + else + { + int space; + int added = -removed - current_removed; + /* Ignore multiples of the section alignment. */ + added = ((1 << sec->alignment_power) - 1) & added; + new_removed = (-added); + + /* Modify for removable. */ + space = removable_space - new_removed; + new_removed = (removable_space + - (((1 << sec->alignment_power) - 1) & space)); + } + return (new_removed - current_removed); +} + + +static void +adjust_fill_action (text_action *ta, int fill_diff) +{ + ta->removed_bytes += fill_diff; +} + + +/* Add a modification action to the text. For the case of adding or + removing space, modify any current fill and assume that + "unreachable_space" bytes can be freely contracted. Note that a + negative removed value is a fill. */ + +static void +text_action_add (text_action_list *l, + text_action_t action, + asection *sec, + bfd_vma offset, + int removed) +{ + text_action **m_p; + text_action *ta; + + /* It is not necessary to fill at the end of a section. */ + if (action == ta_fill && sec->size == offset) + return; + + /* It is not necessary to fill 0 bytes. */ + if (action == ta_fill && removed == 0) + return; + + for (m_p = &l->head; *m_p && (*m_p)->offset <= offset; m_p = &(*m_p)->next) + { + text_action *t = *m_p; + + if (action == ta_fill) + { + /* When the action is another fill at the same address, + just increase the size. */ + if (t->offset == offset && t->action == ta_fill) + { + t->removed_bytes += removed; + return; + } + /* Fills need to happen before widens so that we don't + insert fill bytes into the instruction stream. */ + if (t->offset == offset && t->action == ta_widen_insn) + break; + } + } + + /* Create a new record and fill it up. */ + ta = (text_action *) bfd_zmalloc (sizeof (text_action)); + ta->action = action; + ta->sec = sec; + ta->offset = offset; + ta->removed_bytes = removed; + ta->next = (*m_p); + *m_p = ta; +} + + +static void +text_action_add_literal (text_action_list *l, + text_action_t action, + const r_reloc *loc, + const literal_value *value, + int removed) +{ + text_action **m_p; + text_action *ta; + asection *sec = r_reloc_get_section (loc); + bfd_vma offset = loc->target_offset; + bfd_vma virtual_offset = loc->virtual_offset; + + BFD_ASSERT (action == ta_add_literal); + + for (m_p = &l->head; *m_p != NULL; m_p = &(*m_p)->next) + { + if ((*m_p)->offset > offset + && ((*m_p)->offset != offset + || (*m_p)->virtual_offset > virtual_offset)) + break; + } + + /* Create a new record and fill it up. */ + ta = (text_action *) bfd_zmalloc (sizeof (text_action)); + ta->action = action; + ta->sec = sec; + ta->offset = offset; + ta->virtual_offset = virtual_offset; + ta->value = *value; + ta->removed_bytes = removed; + ta->next = (*m_p); + *m_p = ta; +} + + +/* Find the total offset adjustment for the relaxations specified by + text_actions, beginning from a particular starting action. This is + typically used from offset_with_removed_text to search an entire list of + actions, but it may also be called directly when adjusting adjacent offsets + so that each search may begin where the previous one left off. */ + +static int +removed_by_actions (text_action **p_start_action, + bfd_vma offset, + bfd_boolean before_fill) +{ + text_action *r; + int removed = 0; + + r = *p_start_action; + while (r) + { + if (r->offset > offset) + break; + + if (r->offset == offset + && (before_fill || r->action != ta_fill || r->removed_bytes >= 0)) + break; + + removed += r->removed_bytes; + + r = r->next; + } + + *p_start_action = r; + return removed; +} + + +static bfd_vma +offset_with_removed_text (text_action_list *action_list, bfd_vma offset) +{ + text_action *r = action_list->head; + return offset - removed_by_actions (&r, offset, FALSE); +} + + +static unsigned +action_list_count (text_action_list *action_list) +{ + text_action *r = action_list->head; + unsigned count = 0; + for (r = action_list->head; r != NULL; r = r->next) + { + count++; + } + return count; +} + + +/* The find_insn_action routine will only find non-fill actions. */ + +static text_action * +find_insn_action (text_action_list *action_list, bfd_vma offset) +{ + text_action *t; + for (t = action_list->head; t; t = t->next) + { + if (t->offset == offset) + { + switch (t->action) + { + case ta_none: + case ta_fill: + break; + case ta_remove_insn: + case ta_remove_longcall: + case ta_convert_longcall: + case ta_narrow_insn: + case ta_widen_insn: + return t; + case ta_remove_literal: + case ta_add_literal: + BFD_ASSERT (0); + break; + } + } + } + return NULL; +} + + +#if DEBUG + +static void +print_action_list (FILE *fp, text_action_list *action_list) +{ + text_action *r; + + fprintf (fp, "Text Action\n"); + for (r = action_list->head; r != NULL; r = r->next) + { + const char *t = "unknown"; + switch (r->action) + { + case ta_remove_insn: + t = "remove_insn"; break; + case ta_remove_longcall: + t = "remove_longcall"; break; + case ta_convert_longcall: + t = "convert_longcall"; break; + case ta_narrow_insn: + t = "narrow_insn"; break; + case ta_widen_insn: + t = "widen_insn"; break; + case ta_fill: + t = "fill"; break; + case ta_none: + t = "none"; break; + case ta_remove_literal: + t = "remove_literal"; break; + case ta_add_literal: + t = "add_literal"; break; + } + + fprintf (fp, "%s: %s[0x%lx] \"%s\" %d\n", + r->sec->owner->filename, + r->sec->name, (unsigned long) r->offset, t, r->removed_bytes); + } +} + +#endif /* DEBUG */ + + +/* Lists of literals being coalesced or removed. */ + +/* In the usual case, the literal identified by "from" is being + coalesced with another literal identified by "to". If the literal is + unused and is being removed altogether, "to.abfd" will be NULL. + The removed_literal entries are kept on a per-section list, sorted + by the "from" offset field. */ + +typedef struct removed_literal_struct removed_literal; +typedef struct removed_literal_list_struct removed_literal_list; + +struct removed_literal_struct +{ + r_reloc from; + r_reloc to; + removed_literal *next; +}; + +struct removed_literal_list_struct +{ + removed_literal *head; + removed_literal *tail; +}; + + +/* Record that the literal at "from" is being removed. If "to" is not + NULL, the "from" literal is being coalesced with the "to" literal. */ + +static void +add_removed_literal (removed_literal_list *removed_list, + const r_reloc *from, + const r_reloc *to) +{ + removed_literal *r, *new_r, *next_r; + + new_r = (removed_literal *) bfd_zmalloc (sizeof (removed_literal)); + + new_r->from = *from; + if (to) + new_r->to = *to; + else + new_r->to.abfd = NULL; + new_r->next = NULL; + + r = removed_list->head; + if (r == NULL) + { + removed_list->head = new_r; + removed_list->tail = new_r; + } + /* Special check for common case of append. */ + else if (removed_list->tail->from.target_offset < from->target_offset) + { + removed_list->tail->next = new_r; + removed_list->tail = new_r; + } + else + { + while (r->from.target_offset < from->target_offset && r->next) + { + r = r->next; + } + next_r = r->next; + r->next = new_r; + new_r->next = next_r; + if (next_r == NULL) + removed_list->tail = new_r; + } +} + + +/* Check if the list of removed literals contains an entry for the + given address. Return the entry if found. */ + +static removed_literal * +find_removed_literal (removed_literal_list *removed_list, bfd_vma addr) +{ + removed_literal *r = removed_list->head; + while (r && r->from.target_offset < addr) + r = r->next; + if (r && r->from.target_offset == addr) + return r; + return NULL; +} + + +#if DEBUG + +static void +print_removed_literals (FILE *fp, removed_literal_list *removed_list) +{ + removed_literal *r; + r = removed_list->head; + if (r) + fprintf (fp, "Removed Literals\n"); + for (; r != NULL; r = r->next) + { + print_r_reloc (fp, &r->from); + fprintf (fp, " => "); + if (r->to.abfd == NULL) + fprintf (fp, "REMOVED"); + else + print_r_reloc (fp, &r->to); + fprintf (fp, "\n"); + } +} + +#endif /* DEBUG */ + + +/* Per-section data for relaxation. */ + +typedef struct reloc_bfd_fix_struct reloc_bfd_fix; + +struct xtensa_relax_info_struct +{ + bfd_boolean is_relaxable_literal_section; + bfd_boolean is_relaxable_asm_section; + int visited; /* Number of times visited. */ + + source_reloc *src_relocs; /* Array[src_count]. */ + int src_count; + int src_next; /* Next src_relocs entry to assign. */ + + removed_literal_list removed_list; + text_action_list action_list; + + reloc_bfd_fix *fix_list; + reloc_bfd_fix *fix_array; + unsigned fix_array_count; + + /* Support for expanding the reloc array that is stored + in the section structure. If the relocations have been + reallocated, the newly allocated relocations will be referenced + here along with the actual size allocated. The relocation + count will always be found in the section structure. */ + Elf_Internal_Rela *allocated_relocs; + unsigned relocs_count; + unsigned allocated_relocs_count; +}; + +struct elf_xtensa_section_data +{ + struct bfd_elf_section_data elf; + xtensa_relax_info relax_info; +}; + + +static bfd_boolean +elf_xtensa_new_section_hook (bfd *abfd, asection *sec) +{ + if (!sec->used_by_bfd) + { + struct elf_xtensa_section_data *sdata; + bfd_size_type amt = sizeof (*sdata); + + sdata = bfd_zalloc (abfd, amt); + if (sdata == NULL) + return FALSE; + sec->used_by_bfd = sdata; + } + + return _bfd_elf_new_section_hook (abfd, sec); +} + + +static xtensa_relax_info * +get_xtensa_relax_info (asection *sec) +{ + struct elf_xtensa_section_data *section_data; + + /* No info available if no section or if it is an output section. */ + if (!sec || sec == sec->output_section) + return NULL; + + section_data = (struct elf_xtensa_section_data *) elf_section_data (sec); + return §ion_data->relax_info; +} + + +static void +init_xtensa_relax_info (asection *sec) +{ + xtensa_relax_info *relax_info = get_xtensa_relax_info (sec); + + relax_info->is_relaxable_literal_section = FALSE; + relax_info->is_relaxable_asm_section = FALSE; + relax_info->visited = 0; + + relax_info->src_relocs = NULL; + relax_info->src_count = 0; + relax_info->src_next = 0; + + relax_info->removed_list.head = NULL; + relax_info->removed_list.tail = NULL; + + relax_info->action_list.head = NULL; + + relax_info->fix_list = NULL; + relax_info->fix_array = NULL; + relax_info->fix_array_count = 0; + + relax_info->allocated_relocs = NULL; + relax_info->relocs_count = 0; + relax_info->allocated_relocs_count = 0; +} + + +/* Coalescing literals may require a relocation to refer to a section in + a different input file, but the standard relocation information + cannot express that. Instead, the reloc_bfd_fix structures are used + to "fix" the relocations that refer to sections in other input files. + These structures are kept on per-section lists. The "src_type" field + records the relocation type in case there are multiple relocations on + the same location. FIXME: This is ugly; an alternative might be to + add new symbols with the "owner" field to some other input file. */ + +struct reloc_bfd_fix_struct +{ + asection *src_sec; + bfd_vma src_offset; + unsigned src_type; /* Relocation type. */ + + asection *target_sec; + bfd_vma target_offset; + bfd_boolean translated; + + reloc_bfd_fix *next; +}; + + +static reloc_bfd_fix * +reloc_bfd_fix_init (asection *src_sec, + bfd_vma src_offset, + unsigned src_type, + asection *target_sec, + bfd_vma target_offset, + bfd_boolean translated) +{ + reloc_bfd_fix *fix; + + fix = (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix)); + fix->src_sec = src_sec; + fix->src_offset = src_offset; + fix->src_type = src_type; + fix->target_sec = target_sec; + fix->target_offset = target_offset; + fix->translated = translated; + + return fix; +} + + +static void +add_fix (asection *src_sec, reloc_bfd_fix *fix) +{ + xtensa_relax_info *relax_info; + + relax_info = get_xtensa_relax_info (src_sec); + fix->next = relax_info->fix_list; + relax_info->fix_list = fix; +} + + +static int +fix_compare (const void *ap, const void *bp) +{ + const reloc_bfd_fix *a = (const reloc_bfd_fix *) ap; + const reloc_bfd_fix *b = (const reloc_bfd_fix *) bp; + + if (a->src_offset != b->src_offset) + return (a->src_offset - b->src_offset); + return (a->src_type - b->src_type); +} + + +static void +cache_fix_array (asection *sec) +{ + unsigned i, count = 0; + reloc_bfd_fix *r; + xtensa_relax_info *relax_info = get_xtensa_relax_info (sec); + + if (relax_info == NULL) + return; + if (relax_info->fix_list == NULL) + return; + + for (r = relax_info->fix_list; r != NULL; r = r->next) + count++; + + relax_info->fix_array = + (reloc_bfd_fix *) bfd_malloc (sizeof (reloc_bfd_fix) * count); + relax_info->fix_array_count = count; + + r = relax_info->fix_list; + for (i = 0; i < count; i++, r = r->next) + { + relax_info->fix_array[count - 1 - i] = *r; + relax_info->fix_array[count - 1 - i].next = NULL; + } + + qsort (relax_info->fix_array, relax_info->fix_array_count, + sizeof (reloc_bfd_fix), fix_compare); +} + + +static reloc_bfd_fix * +get_bfd_fix (asection *sec, bfd_vma offset, unsigned type) +{ + xtensa_relax_info *relax_info = get_xtensa_relax_info (sec); + reloc_bfd_fix *rv; + reloc_bfd_fix key; + + if (relax_info == NULL) + return NULL; + if (relax_info->fix_list == NULL) + return NULL; + + if (relax_info->fix_array == NULL) + cache_fix_array (sec); + + key.src_offset = offset; + key.src_type = type; + rv = bsearch (&key, relax_info->fix_array, relax_info->fix_array_count, + sizeof (reloc_bfd_fix), fix_compare); + return rv; +} + + +/* Section caching. */ + +typedef struct section_cache_struct section_cache_t; + +struct section_cache_struct +{ + asection *sec; + + bfd_byte *contents; /* Cache of the section contents. */ + bfd_size_type content_length; + + property_table_entry *ptbl; /* Cache of the section property table. */ + unsigned pte_count; + + Elf_Internal_Rela *relocs; /* Cache of the section relocations. */ + unsigned reloc_count; +}; + + +static void +init_section_cache (section_cache_t *sec_cache) +{ + memset (sec_cache, 0, sizeof (*sec_cache)); +} + + +static void +free_section_cache (section_cache_t *sec_cache) +{ + if (sec_cache->sec) + { + release_contents (sec_cache->sec, sec_cache->contents); + release_internal_relocs (sec_cache->sec, sec_cache->relocs); + if (sec_cache->ptbl) + free (sec_cache->ptbl); + } +} + + +static bfd_boolean +section_cache_section (section_cache_t *sec_cache, + asection *sec, + struct bfd_link_info *link_info) +{ + bfd *abfd; + property_table_entry *prop_table = NULL; + int ptblsize = 0; + bfd_byte *contents = NULL; + Elf_Internal_Rela *internal_relocs = NULL; + bfd_size_type sec_size; + + if (sec == NULL) + return FALSE; + if (sec == sec_cache->sec) + return TRUE; + + abfd = sec->owner; + sec_size = bfd_get_section_limit (abfd, sec); + + /* Get the contents. */ + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec_size != 0) + goto err; + + /* Get the relocations. */ + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + + /* Get the entry table. */ + ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table, + XTENSA_PROP_SEC_NAME, FALSE); + if (ptblsize < 0) + goto err; + + /* Fill in the new section cache. */ + free_section_cache (sec_cache); + init_section_cache (sec_cache); + + sec_cache->sec = sec; + sec_cache->contents = contents; + sec_cache->content_length = sec_size; + sec_cache->relocs = internal_relocs; + sec_cache->reloc_count = sec->reloc_count; + sec_cache->pte_count = ptblsize; + sec_cache->ptbl = prop_table; + + return TRUE; + + err: + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + if (prop_table) + free (prop_table); + return FALSE; +} + + +/* Extended basic blocks. */ + +/* An ebb_struct represents an Extended Basic Block. Within this + range, we guarantee that all instructions are decodable, the + property table entries are contiguous, and no property table + specifies a segment that cannot have instructions moved. This + structure contains caches of the contents, property table and + relocations for the specified section for easy use. The range is + specified by ranges of indices for the byte offset, property table + offsets and relocation offsets. These must be consistent. */ + +typedef struct ebb_struct ebb_t; + +struct ebb_struct +{ + asection *sec; + + bfd_byte *contents; /* Cache of the section contents. */ + bfd_size_type content_length; + + property_table_entry *ptbl; /* Cache of the section property table. */ + unsigned pte_count; + + Elf_Internal_Rela *relocs; /* Cache of the section relocations. */ + unsigned reloc_count; + + bfd_vma start_offset; /* Offset in section. */ + unsigned start_ptbl_idx; /* Offset in the property table. */ + unsigned start_reloc_idx; /* Offset in the relocations. */ + + bfd_vma end_offset; + unsigned end_ptbl_idx; + unsigned end_reloc_idx; + + bfd_boolean ends_section; /* Is this the last ebb in a section? */ + + /* The unreachable property table at the end of this set of blocks; + NULL if the end is not an unreachable block. */ + property_table_entry *ends_unreachable; +}; + + +enum ebb_target_enum +{ + EBB_NO_ALIGN = 0, + EBB_DESIRE_TGT_ALIGN, + EBB_REQUIRE_TGT_ALIGN, + EBB_REQUIRE_LOOP_ALIGN, + EBB_REQUIRE_ALIGN +}; + + +/* proposed_action_struct is similar to the text_action_struct except + that is represents a potential transformation, not one that will + occur. We build a list of these for an extended basic block + and use them to compute the actual actions desired. We must be + careful that the entire set of actual actions we perform do not + break any relocations that would fit if the actions were not + performed. */ + +typedef struct proposed_action_struct proposed_action; + +struct proposed_action_struct +{ + enum ebb_target_enum align_type; /* for the target alignment */ + bfd_vma alignment_pow; + text_action_t action; + bfd_vma offset; + int removed_bytes; + bfd_boolean do_action; /* If false, then we will not perform the action. */ +}; + + +/* The ebb_constraint_struct keeps a set of proposed actions for an + extended basic block. */ + +typedef struct ebb_constraint_struct ebb_constraint; + +struct ebb_constraint_struct +{ + ebb_t ebb; + bfd_boolean start_movable; + + /* Bytes of extra space at the beginning if movable. */ + int start_extra_space; + + enum ebb_target_enum start_align; + + bfd_boolean end_movable; + + /* Bytes of extra space at the end if movable. */ + int end_extra_space; + + unsigned action_count; + unsigned action_allocated; + + /* Array of proposed actions. */ + proposed_action *actions; + + /* Action alignments -- one for each proposed action. */ + enum ebb_target_enum *action_aligns; +}; + + +static void +init_ebb_constraint (ebb_constraint *c) +{ + memset (c, 0, sizeof (ebb_constraint)); +} + + +static void +free_ebb_constraint (ebb_constraint *c) +{ + if (c->actions) + free (c->actions); +} + + +static void +init_ebb (ebb_t *ebb, + asection *sec, + bfd_byte *contents, + bfd_size_type content_length, + property_table_entry *prop_table, + unsigned ptblsize, + Elf_Internal_Rela *internal_relocs, + unsigned reloc_count) +{ + memset (ebb, 0, sizeof (ebb_t)); + ebb->sec = sec; + ebb->contents = contents; + ebb->content_length = content_length; + ebb->ptbl = prop_table; + ebb->pte_count = ptblsize; + ebb->relocs = internal_relocs; + ebb->reloc_count = reloc_count; + ebb->start_offset = 0; + ebb->end_offset = ebb->content_length - 1; + ebb->start_ptbl_idx = 0; + ebb->end_ptbl_idx = ptblsize; + ebb->start_reloc_idx = 0; + ebb->end_reloc_idx = reloc_count; +} + + +/* Extend the ebb to all decodable contiguous sections. The algorithm + for building a basic block around an instruction is to push it + forward until we hit the end of a section, an unreachable block or + a block that cannot be transformed. Then we push it backwards + searching for similar conditions. */ + +static bfd_boolean extend_ebb_bounds_forward (ebb_t *); +static bfd_boolean extend_ebb_bounds_backward (ebb_t *); +static bfd_size_type insn_block_decodable_len + (bfd_byte *, bfd_size_type, bfd_vma, bfd_size_type); + +static bfd_boolean +extend_ebb_bounds (ebb_t *ebb) +{ + if (!extend_ebb_bounds_forward (ebb)) + return FALSE; + if (!extend_ebb_bounds_backward (ebb)) + return FALSE; + return TRUE; +} + + +static bfd_boolean +extend_ebb_bounds_forward (ebb_t *ebb) +{ + property_table_entry *the_entry, *new_entry; + + the_entry = &ebb->ptbl[ebb->end_ptbl_idx]; + + /* Stop when (1) we cannot decode an instruction, (2) we are at + the end of the property tables, (3) we hit a non-contiguous property + table entry, (4) we hit a NO_TRANSFORM region. */ + + while (1) + { + bfd_vma entry_end; + bfd_size_type insn_block_len; + + entry_end = the_entry->address - ebb->sec->vma + the_entry->size; + insn_block_len = + insn_block_decodable_len (ebb->contents, ebb->content_length, + ebb->end_offset, + entry_end - ebb->end_offset); + if (insn_block_len != (entry_end - ebb->end_offset)) + { + (*_bfd_error_handler) + (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"), + ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len); + return FALSE; + } + ebb->end_offset += insn_block_len; + + if (ebb->end_offset == ebb->sec->size) + ebb->ends_section = TRUE; + + /* Update the reloc counter. */ + while (ebb->end_reloc_idx + 1 < ebb->reloc_count + && (ebb->relocs[ebb->end_reloc_idx + 1].r_offset + < ebb->end_offset)) + { + ebb->end_reloc_idx++; + } + + if (ebb->end_ptbl_idx + 1 == ebb->pte_count) + return TRUE; + + new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1]; + if (((new_entry->flags & XTENSA_PROP_INSN) == 0) + || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0) + || ((the_entry->flags & XTENSA_PROP_ALIGN) != 0)) + break; + + if (the_entry->address + the_entry->size != new_entry->address) + break; + + the_entry = new_entry; + ebb->end_ptbl_idx++; + } + + /* Quick check for an unreachable or end of file just at the end. */ + if (ebb->end_ptbl_idx + 1 == ebb->pte_count) + { + if (ebb->end_offset == ebb->content_length) + ebb->ends_section = TRUE; + } + else + { + new_entry = &ebb->ptbl[ebb->end_ptbl_idx + 1]; + if ((new_entry->flags & XTENSA_PROP_UNREACHABLE) != 0 + && the_entry->address + the_entry->size == new_entry->address) + ebb->ends_unreachable = new_entry; + } + + /* Any other ending requires exact alignment. */ + return TRUE; +} + + +static bfd_boolean +extend_ebb_bounds_backward (ebb_t *ebb) +{ + property_table_entry *the_entry, *new_entry; + + the_entry = &ebb->ptbl[ebb->start_ptbl_idx]; + + /* Stop when (1) we cannot decode the instructions in the current entry. + (2) we are at the beginning of the property tables, (3) we hit a + non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */ + + while (1) + { + bfd_vma block_begin; + bfd_size_type insn_block_len; + + block_begin = the_entry->address - ebb->sec->vma; + insn_block_len = + insn_block_decodable_len (ebb->contents, ebb->content_length, + block_begin, + ebb->start_offset - block_begin); + if (insn_block_len != ebb->start_offset - block_begin) + { + (*_bfd_error_handler) + (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"), + ebb->sec->owner, ebb->sec, ebb->end_offset + insn_block_len); + return FALSE; + } + ebb->start_offset -= insn_block_len; + + /* Update the reloc counter. */ + while (ebb->start_reloc_idx > 0 + && (ebb->relocs[ebb->start_reloc_idx - 1].r_offset + >= ebb->start_offset)) + { + ebb->start_reloc_idx--; + } + + if (ebb->start_ptbl_idx == 0) + return TRUE; + + new_entry = &ebb->ptbl[ebb->start_ptbl_idx - 1]; + if ((new_entry->flags & XTENSA_PROP_INSN) == 0 + || ((new_entry->flags & XTENSA_PROP_NO_TRANSFORM) != 0) + || ((new_entry->flags & XTENSA_PROP_ALIGN) != 0)) + return TRUE; + if (new_entry->address + new_entry->size != the_entry->address) + return TRUE; + + the_entry = new_entry; + ebb->start_ptbl_idx--; + } + return TRUE; +} + + +static bfd_size_type +insn_block_decodable_len (bfd_byte *contents, + bfd_size_type content_len, + bfd_vma block_offset, + bfd_size_type block_len) +{ + bfd_vma offset = block_offset; + + while (offset < block_offset + block_len) + { + bfd_size_type insn_len = 0; + + insn_len = insn_decode_len (contents, content_len, offset); + if (insn_len == 0) + return (offset - block_offset); + offset += insn_len; + } + return (offset - block_offset); +} + + +static void +ebb_propose_action (ebb_constraint *c, + enum ebb_target_enum align_type, + bfd_vma alignment_pow, + text_action_t action, + bfd_vma offset, + int removed_bytes, + bfd_boolean do_action) +{ + proposed_action *act; + + if (c->action_allocated <= c->action_count) + { + unsigned new_allocated, i; + proposed_action *new_actions; + + new_allocated = (c->action_count + 2) * 2; + new_actions = (proposed_action *) + bfd_zmalloc (sizeof (proposed_action) * new_allocated); + + for (i = 0; i < c->action_count; i++) + new_actions[i] = c->actions[i]; + if (c->actions) + free (c->actions); + c->actions = new_actions; + c->action_allocated = new_allocated; + } + + act = &c->actions[c->action_count]; + act->align_type = align_type; + act->alignment_pow = alignment_pow; + act->action = action; + act->offset = offset; + act->removed_bytes = removed_bytes; + act->do_action = do_action; + + c->action_count++; +} + + +/* Access to internal relocations, section contents and symbols. */ + +/* During relaxation, we need to modify relocations, section contents, + and symbol definitions, and we need to keep the original values from + being reloaded from the input files, i.e., we need to "pin" the + modified values in memory. We also want to continue to observe the + setting of the "keep-memory" flag. The following functions wrap the + standard BFD functions to take care of this for us. */ + +static Elf_Internal_Rela * +retrieve_internal_relocs (bfd *abfd, asection *sec, bfd_boolean keep_memory) +{ + Elf_Internal_Rela *internal_relocs; + + if ((sec->flags & SEC_LINKER_CREATED) != 0) + return NULL; + + internal_relocs = elf_section_data (sec)->relocs; + if (internal_relocs == NULL) + internal_relocs = (_bfd_elf_link_read_relocs + (abfd, sec, NULL, NULL, keep_memory)); + return internal_relocs; +} + + +static void +pin_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs) +{ + elf_section_data (sec)->relocs = internal_relocs; +} + + +static void +release_internal_relocs (asection *sec, Elf_Internal_Rela *internal_relocs) +{ + if (internal_relocs + && elf_section_data (sec)->relocs != internal_relocs) + free (internal_relocs); +} + + +static bfd_byte * +retrieve_contents (bfd *abfd, asection *sec, bfd_boolean keep_memory) +{ + bfd_byte *contents; + bfd_size_type sec_size; + + sec_size = bfd_get_section_limit (abfd, sec); + contents = elf_section_data (sec)->this_hdr.contents; + + if (contents == NULL && sec_size != 0) + { + if (!bfd_malloc_and_get_section (abfd, sec, &contents)) + { + if (contents) + free (contents); + return NULL; + } + if (keep_memory) + elf_section_data (sec)->this_hdr.contents = contents; + } + return contents; +} + + +static void +pin_contents (asection *sec, bfd_byte *contents) +{ + elf_section_data (sec)->this_hdr.contents = contents; +} + + +static void +release_contents (asection *sec, bfd_byte *contents) +{ + if (contents && elf_section_data (sec)->this_hdr.contents != contents) + free (contents); +} + + +static Elf_Internal_Sym * +retrieve_local_syms (bfd *input_bfd) +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Sym *isymbuf; + size_t locsymcount; + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + locsymcount = symtab_hdr->sh_info; + + isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; + if (isymbuf == NULL && locsymcount != 0) + isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0, + NULL, NULL, NULL); + + /* Save the symbols for this input file so they won't be read again. */ + if (isymbuf && isymbuf != (Elf_Internal_Sym *) symtab_hdr->contents) + symtab_hdr->contents = (unsigned char *) isymbuf; + + return isymbuf; +} + + +/* Code for link-time relaxation. */ + +/* Initialization for relaxation: */ +static bfd_boolean analyze_relocations (struct bfd_link_info *); +static bfd_boolean find_relaxable_sections + (bfd *, asection *, struct bfd_link_info *, bfd_boolean *); +static bfd_boolean collect_source_relocs + (bfd *, asection *, struct bfd_link_info *); +static bfd_boolean is_resolvable_asm_expansion + (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, struct bfd_link_info *, + bfd_boolean *); +static Elf_Internal_Rela *find_associated_l32r_irel + (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Rela *); +static bfd_boolean compute_text_actions + (bfd *, asection *, struct bfd_link_info *); +static bfd_boolean compute_ebb_proposed_actions (ebb_constraint *); +static bfd_boolean compute_ebb_actions (ebb_constraint *); +static bfd_boolean check_section_ebb_pcrels_fit + (bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, const ebb_constraint *, + const xtensa_opcode *); +static bfd_boolean check_section_ebb_reduces (const ebb_constraint *); +static void text_action_add_proposed + (text_action_list *, const ebb_constraint *, asection *); +static int compute_fill_extra_space (property_table_entry *); + +/* First pass: */ +static bfd_boolean compute_removed_literals + (bfd *, asection *, struct bfd_link_info *, value_map_hash_table *); +static Elf_Internal_Rela *get_irel_at_offset + (asection *, Elf_Internal_Rela *, bfd_vma); +static bfd_boolean is_removable_literal + (const source_reloc *, int, const source_reloc *, int, asection *, + property_table_entry *, int); +static bfd_boolean remove_dead_literal + (bfd *, asection *, struct bfd_link_info *, Elf_Internal_Rela *, + Elf_Internal_Rela *, source_reloc *, property_table_entry *, int); +static bfd_boolean identify_literal_placement + (bfd *, asection *, bfd_byte *, struct bfd_link_info *, + value_map_hash_table *, bfd_boolean *, Elf_Internal_Rela *, int, + source_reloc *, property_table_entry *, int, section_cache_t *, + bfd_boolean); +static bfd_boolean relocations_reach (source_reloc *, int, const r_reloc *); +static bfd_boolean coalesce_shared_literal + (asection *, source_reloc *, property_table_entry *, int, value_map *); +static bfd_boolean move_shared_literal + (asection *, struct bfd_link_info *, source_reloc *, property_table_entry *, + int, const r_reloc *, const literal_value *, section_cache_t *); + +/* Second pass: */ +static bfd_boolean relax_section (bfd *, asection *, struct bfd_link_info *); +static bfd_boolean translate_section_fixes (asection *); +static bfd_boolean translate_reloc_bfd_fix (reloc_bfd_fix *); +static asection *translate_reloc (const r_reloc *, r_reloc *, asection *); +static void shrink_dynamic_reloc_sections + (struct bfd_link_info *, bfd *, asection *, Elf_Internal_Rela *); +static bfd_boolean move_literal + (bfd *, struct bfd_link_info *, asection *, bfd_vma, bfd_byte *, + xtensa_relax_info *, Elf_Internal_Rela **, const literal_value *); +static bfd_boolean relax_property_section + (bfd *, asection *, struct bfd_link_info *); + +/* Third pass: */ +static bfd_boolean relax_section_symbols (bfd *, asection *); + + +static bfd_boolean +elf_xtensa_relax_section (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info, + bfd_boolean *again) +{ + static value_map_hash_table *values = NULL; + static bfd_boolean relocations_analyzed = FALSE; + xtensa_relax_info *relax_info; + + if (!relocations_analyzed) + { + /* Do some overall initialization for relaxation. */ + values = value_map_hash_table_init (); + if (values == NULL) + return FALSE; + relaxing_section = TRUE; + if (!analyze_relocations (link_info)) + return FALSE; + relocations_analyzed = TRUE; + } + *again = FALSE; + + /* Don't mess with linker-created sections. */ + if ((sec->flags & SEC_LINKER_CREATED) != 0) + return TRUE; + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info != NULL); + + switch (relax_info->visited) + { + case 0: + /* Note: It would be nice to fold this pass into + analyze_relocations, but it is important for this step that the + sections be examined in link order. */ + if (!compute_removed_literals (abfd, sec, link_info, values)) + return FALSE; + *again = TRUE; + break; + + case 1: + if (values) + value_map_hash_table_delete (values); + values = NULL; + if (!relax_section (abfd, sec, link_info)) + return FALSE; + *again = TRUE; + break; + + case 2: + if (!relax_section_symbols (abfd, sec)) + return FALSE; + break; + } + + relax_info->visited++; + return TRUE; +} + + +/* Initialization for relaxation. */ + +/* This function is called once at the start of relaxation. It scans + all the input sections and marks the ones that are relaxable (i.e., + literal sections with L32R relocations against them), and then + collects source_reloc information for all the relocations against + those relaxable sections. During this process, it also detects + longcalls, i.e., calls relaxed by the assembler into indirect + calls, that can be optimized back into direct calls. Within each + extended basic block (ebb) containing an optimized longcall, it + computes a set of "text actions" that can be performed to remove + the L32R associated with the longcall while optionally preserving + branch target alignments. */ + +static bfd_boolean +analyze_relocations (struct bfd_link_info *link_info) +{ + bfd *abfd; + asection *sec; + bfd_boolean is_relaxable = FALSE; + + /* Initialize the per-section relaxation info. */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + init_xtensa_relax_info (sec); + } + + /* Mark relaxable sections (and count relocations against each one). */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + if (!find_relaxable_sections (abfd, sec, link_info, &is_relaxable)) + return FALSE; + } + + /* Bail out if there are no relaxable sections. */ + if (!is_relaxable) + return TRUE; + + /* Allocate space for source_relocs. */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + xtensa_relax_info *relax_info; + + relax_info = get_xtensa_relax_info (sec); + if (relax_info->is_relaxable_literal_section + || relax_info->is_relaxable_asm_section) + { + relax_info->src_relocs = (source_reloc *) + bfd_malloc (relax_info->src_count * sizeof (source_reloc)); + } + else + relax_info->src_count = 0; + } + + /* Collect info on relocations against each relaxable section. */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + if (!collect_source_relocs (abfd, sec, link_info)) + return FALSE; + } + + /* Compute the text actions. */ + for (abfd = link_info->input_bfds; abfd != NULL; abfd = abfd->link.next) + for (sec = abfd->sections; sec != NULL; sec = sec->next) + { + if (!compute_text_actions (abfd, sec, link_info)) + return FALSE; + } + + return TRUE; +} + + +/* Find all the sections that might be relaxed. The motivation for + this pass is that collect_source_relocs() needs to record _all_ the + relocations that target each relaxable section. That is expensive + and unnecessary unless the target section is actually going to be + relaxed. This pass identifies all such sections by checking if + they have L32Rs pointing to them. In the process, the total number + of relocations targeting each section is also counted so that we + know how much space to allocate for source_relocs against each + relaxable literal section. */ + +static bfd_boolean +find_relaxable_sections (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info, + bfd_boolean *is_relaxable_p) +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + bfd_boolean ok = TRUE; + unsigned i; + xtensa_relax_info *source_relax_info; + bfd_boolean is_l32r_reloc; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + if (internal_relocs == NULL) + return ok; + + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec->size != 0) + { + ok = FALSE; + goto error_return; + } + + source_relax_info = get_xtensa_relax_info (sec); + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + r_reloc r_rel; + asection *target_sec; + xtensa_relax_info *target_relax_info; + + /* If this section has not already been marked as "relaxable", and + if it contains any ASM_EXPAND relocations (marking expanded + longcalls) that can be optimized into direct calls, then mark + the section as "relaxable". */ + if (source_relax_info + && !source_relax_info->is_relaxable_asm_section + && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_EXPAND) + { + bfd_boolean is_reachable = FALSE; + if (is_resolvable_asm_expansion (abfd, sec, contents, irel, + link_info, &is_reachable) + && is_reachable) + { + source_relax_info->is_relaxable_asm_section = TRUE; + *is_relaxable_p = TRUE; + } + } + + r_reloc_init (&r_rel, abfd, irel, contents, + bfd_get_section_limit (abfd, sec)); + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + if (!target_relax_info) + continue; + + /* Count PC-relative operand relocations against the target section. + Note: The conditions tested here must match the conditions under + which init_source_reloc is called in collect_source_relocs(). */ + is_l32r_reloc = FALSE; + if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))) + { + xtensa_opcode opcode = + get_relocation_opcode (abfd, sec, contents, irel); + if (opcode != XTENSA_UNDEFINED) + { + is_l32r_reloc = (opcode == get_l32r_opcode ()); + if (!is_alt_relocation (ELF32_R_TYPE (irel->r_info)) + || is_l32r_reloc) + target_relax_info->src_count++; + } + } + + if (is_l32r_reloc && r_reloc_is_defined (&r_rel)) + { + /* Mark the target section as relaxable. */ + target_relax_info->is_relaxable_literal_section = TRUE; + *is_relaxable_p = TRUE; + } + } + + error_return: + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + return ok; +} + + +/* Record _all_ the relocations that point to relaxable sections, and + get rid of ASM_EXPAND relocs by either converting them to + ASM_SIMPLIFY or by removing them. */ + +static bfd_boolean +collect_source_relocs (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info) +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + bfd_boolean ok = TRUE; + unsigned i; + bfd_size_type sec_size; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + if (internal_relocs == NULL) + return ok; + + sec_size = bfd_get_section_limit (abfd, sec); + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec_size != 0) + { + ok = FALSE; + goto error_return; + } + + /* Record relocations against relaxable literal sections. */ + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + r_reloc r_rel; + asection *target_sec; + xtensa_relax_info *target_relax_info; + + r_reloc_init (&r_rel, abfd, irel, contents, sec_size); + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + + if (target_relax_info + && (target_relax_info->is_relaxable_literal_section + || target_relax_info->is_relaxable_asm_section)) + { + xtensa_opcode opcode = XTENSA_UNDEFINED; + int opnd = -1; + bfd_boolean is_abs_literal = FALSE; + + if (is_alt_relocation (ELF32_R_TYPE (irel->r_info))) + { + /* None of the current alternate relocs are PC-relative, + and only PC-relative relocs matter here. However, we + still need to record the opcode for literal + coalescing. */ + opcode = get_relocation_opcode (abfd, sec, contents, irel); + if (opcode == get_l32r_opcode ()) + { + is_abs_literal = TRUE; + opnd = 1; + } + else + opcode = XTENSA_UNDEFINED; + } + else if (is_operand_relocation (ELF32_R_TYPE (irel->r_info))) + { + opcode = get_relocation_opcode (abfd, sec, contents, irel); + opnd = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info)); + } + + if (opcode != XTENSA_UNDEFINED) + { + int src_next = target_relax_info->src_next++; + source_reloc *s_reloc = &target_relax_info->src_relocs[src_next]; + + init_source_reloc (s_reloc, sec, &r_rel, opcode, opnd, + is_abs_literal); + } + } + } + + /* Now get rid of ASM_EXPAND relocations. At this point, the + src_relocs array for the target literal section may still be + incomplete, but it must at least contain the entries for the L32R + relocations associated with ASM_EXPANDs because they were just + added in the preceding loop over the relocations. */ + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + bfd_boolean is_reachable; + + if (!is_resolvable_asm_expansion (abfd, sec, contents, irel, link_info, + &is_reachable)) + continue; + + if (is_reachable) + { + Elf_Internal_Rela *l32r_irel; + r_reloc r_rel; + asection *target_sec; + xtensa_relax_info *target_relax_info; + + /* Mark the source_reloc for the L32R so that it will be + removed in compute_removed_literals(), along with the + associated literal. */ + l32r_irel = find_associated_l32r_irel (abfd, sec, contents, + irel, internal_relocs); + if (l32r_irel == NULL) + continue; + + r_reloc_init (&r_rel, abfd, l32r_irel, contents, sec_size); + + target_sec = r_reloc_get_section (&r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + + if (target_relax_info + && (target_relax_info->is_relaxable_literal_section + || target_relax_info->is_relaxable_asm_section)) + { + source_reloc *s_reloc; + + /* Search the source_relocs for the entry corresponding to + the l32r_irel. Note: The src_relocs array is not yet + sorted, but it wouldn't matter anyway because we're + searching by source offset instead of target offset. */ + s_reloc = find_source_reloc (target_relax_info->src_relocs, + target_relax_info->src_next, + sec, l32r_irel); + BFD_ASSERT (s_reloc); + s_reloc->is_null = TRUE; + } + + /* Convert this reloc to ASM_SIMPLIFY. */ + irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), + R_XTENSA_ASM_SIMPLIFY); + l32r_irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + + pin_internal_relocs (sec, internal_relocs); + } + else + { + /* It is resolvable but doesn't reach. We resolve now + by eliminating the relocation -- the call will remain + expanded into L32R/CALLX. */ + irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + pin_internal_relocs (sec, internal_relocs); + } + } + + error_return: + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + return ok; +} + + +/* Return TRUE if the asm expansion can be resolved. Generally it can + be resolved on a final link or when a partial link locates it in the + same section as the target. Set "is_reachable" flag if the target of + the call is within the range of a direct call, given the current VMA + for this section and the target section. */ + +bfd_boolean +is_resolvable_asm_expansion (bfd *abfd, + asection *sec, + bfd_byte *contents, + Elf_Internal_Rela *irel, + struct bfd_link_info *link_info, + bfd_boolean *is_reachable_p) +{ + asection *target_sec; + bfd_vma target_offset; + r_reloc r_rel; + xtensa_opcode opcode, direct_call_opcode; + bfd_vma self_address; + bfd_vma dest_address; + bfd_boolean uses_l32r; + bfd_size_type sec_size; + + *is_reachable_p = FALSE; + + if (contents == NULL) + return FALSE; + + if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_EXPAND) + return FALSE; + + sec_size = bfd_get_section_limit (abfd, sec); + opcode = get_expanded_call_opcode (contents + irel->r_offset, + sec_size - irel->r_offset, &uses_l32r); + /* Optimization of longcalls that use CONST16 is not yet implemented. */ + if (!uses_l32r) + return FALSE; + + direct_call_opcode = swap_callx_for_call_opcode (opcode); + if (direct_call_opcode == XTENSA_UNDEFINED) + return FALSE; + + /* Check and see that the target resolves. */ + r_reloc_init (&r_rel, abfd, irel, contents, sec_size); + if (!r_reloc_is_defined (&r_rel)) + return FALSE; + + target_sec = r_reloc_get_section (&r_rel); + target_offset = r_rel.target_offset; + + /* If the target is in a shared library, then it doesn't reach. This + isn't supposed to come up because the compiler should never generate + non-PIC calls on systems that use shared libraries, but the linker + shouldn't crash regardless. */ + if (!target_sec->output_section) + return FALSE; + + /* For relocatable sections, we can only simplify when the output + section of the target is the same as the output section of the + source. */ + if (link_info->relocatable + && (target_sec->output_section != sec->output_section + || is_reloc_sym_weak (abfd, irel))) + return FALSE; + + if (target_sec->output_section != sec->output_section) + { + /* If the two sections are sufficiently far away that relaxation + might take the call out of range, we can't simplify. For + example, a positive displacement call into another memory + could get moved to a lower address due to literal removal, + but the destination won't move, and so the displacment might + get larger. + + If the displacement is negative, assume the destination could + move as far back as the start of the output section. The + self_address will be at least as far into the output section + as it is prior to relaxation. + + If the displacement is postive, assume the destination will be in + it's pre-relaxed location (because relaxation only makes sections + smaller). The self_address could go all the way to the beginning + of the output section. */ + + dest_address = target_sec->output_section->vma; + self_address = sec->output_section->vma; + + if (sec->output_section->vma > target_sec->output_section->vma) + self_address += sec->output_offset + irel->r_offset + 3; + else + dest_address += bfd_get_section_limit (abfd, target_sec->output_section); + /* Call targets should be four-byte aligned. */ + dest_address = (dest_address + 3) & ~3; + } + else + { + + self_address = (sec->output_section->vma + + sec->output_offset + irel->r_offset + 3); + dest_address = (target_sec->output_section->vma + + target_sec->output_offset + target_offset); + } + + *is_reachable_p = pcrel_reloc_fits (direct_call_opcode, 0, + self_address, dest_address); + + if ((self_address >> CALL_SEGMENT_BITS) != + (dest_address >> CALL_SEGMENT_BITS)) + return FALSE; + + return TRUE; +} + + +static Elf_Internal_Rela * +find_associated_l32r_irel (bfd *abfd, + asection *sec, + bfd_byte *contents, + Elf_Internal_Rela *other_irel, + Elf_Internal_Rela *internal_relocs) +{ + unsigned i; + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + + if (irel == other_irel) + continue; + if (irel->r_offset != other_irel->r_offset) + continue; + if (is_l32r_relocation (abfd, sec, contents, irel)) + return irel; + } + + return NULL; +} + + +static xtensa_opcode * +build_reloc_opcodes (bfd *abfd, + asection *sec, + bfd_byte *contents, + Elf_Internal_Rela *internal_relocs) +{ + unsigned i; + xtensa_opcode *reloc_opcodes = + (xtensa_opcode *) bfd_malloc (sizeof (xtensa_opcode) * sec->reloc_count); + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + reloc_opcodes[i] = get_relocation_opcode (abfd, sec, contents, irel); + } + return reloc_opcodes; +} + + +/* The compute_text_actions function will build a list of potential + transformation actions for code in the extended basic block of each + longcall that is optimized to a direct call. From this list we + generate a set of actions to actually perform that optimizes for + space and, if not using size_opt, maintains branch target + alignments. + + These actions to be performed are placed on a per-section list. + The actual changes are performed by relax_section() in the second + pass. */ + +bfd_boolean +compute_text_actions (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info) +{ + xtensa_opcode *reloc_opcodes = NULL; + xtensa_relax_info *relax_info; + bfd_byte *contents; + Elf_Internal_Rela *internal_relocs; + bfd_boolean ok = TRUE; + unsigned i; + property_table_entry *prop_table = 0; + int ptblsize = 0; + bfd_size_type sec_size; + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + BFD_ASSERT (relax_info->src_next == relax_info->src_count); + + /* Do nothing if the section contains no optimized longcalls. */ + if (!relax_info->is_relaxable_asm_section) + return ok; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + + if (internal_relocs) + qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), + internal_reloc_compare); + + sec_size = bfd_get_section_limit (abfd, sec); + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec_size != 0) + { + ok = FALSE; + goto error_return; + } + + ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table, + XTENSA_PROP_SEC_NAME, FALSE); + if (ptblsize < 0) + { + ok = FALSE; + goto error_return; + } + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + bfd_vma r_offset; + property_table_entry *the_entry; + int ptbl_idx; + ebb_t *ebb; + ebb_constraint ebb_table; + bfd_size_type simplify_size; + + if (irel && ELF32_R_TYPE (irel->r_info) != R_XTENSA_ASM_SIMPLIFY) + continue; + r_offset = irel->r_offset; + + simplify_size = get_asm_simplify_size (contents, sec_size, r_offset); + if (simplify_size == 0) + { + (*_bfd_error_handler) + (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"), + sec->owner, sec, r_offset); + continue; + } + + /* If the instruction table is not around, then don't do this + relaxation. */ + the_entry = elf_xtensa_find_property_entry (prop_table, ptblsize, + sec->vma + irel->r_offset); + if (the_entry == NULL || XTENSA_NO_NOP_REMOVAL) + { + text_action_add (&relax_info->action_list, + ta_convert_longcall, sec, r_offset, + 0); + continue; + } + + /* If the next longcall happens to be at the same address as an + unreachable section of size 0, then skip forward. */ + ptbl_idx = the_entry - prop_table; + while ((the_entry->flags & XTENSA_PROP_UNREACHABLE) + && the_entry->size == 0 + && ptbl_idx + 1 < ptblsize + && (prop_table[ptbl_idx + 1].address + == prop_table[ptbl_idx].address)) + { + ptbl_idx++; + the_entry++; + } + + if (the_entry->flags & XTENSA_PROP_NO_TRANSFORM) + /* NO_REORDER is OK */ + continue; + + init_ebb_constraint (&ebb_table); + ebb = &ebb_table.ebb; + init_ebb (ebb, sec, contents, sec_size, prop_table, ptblsize, + internal_relocs, sec->reloc_count); + ebb->start_offset = r_offset + simplify_size; + ebb->end_offset = r_offset + simplify_size; + ebb->start_ptbl_idx = ptbl_idx; + ebb->end_ptbl_idx = ptbl_idx; + ebb->start_reloc_idx = i; + ebb->end_reloc_idx = i; + + /* Precompute the opcode for each relocation. */ + if (reloc_opcodes == NULL) + reloc_opcodes = build_reloc_opcodes (abfd, sec, contents, + internal_relocs); + + if (!extend_ebb_bounds (ebb) + || !compute_ebb_proposed_actions (&ebb_table) + || !compute_ebb_actions (&ebb_table) + || !check_section_ebb_pcrels_fit (abfd, sec, contents, + internal_relocs, &ebb_table, + reloc_opcodes) + || !check_section_ebb_reduces (&ebb_table)) + { + /* If anything goes wrong or we get unlucky and something does + not fit, with our plan because of expansion between + critical branches, just convert to a NOP. */ + + text_action_add (&relax_info->action_list, + ta_convert_longcall, sec, r_offset, 0); + i = ebb_table.ebb.end_reloc_idx; + free_ebb_constraint (&ebb_table); + continue; + } + + text_action_add_proposed (&relax_info->action_list, &ebb_table, sec); + + /* Update the index so we do not go looking at the relocations + we have already processed. */ + i = ebb_table.ebb.end_reloc_idx; + free_ebb_constraint (&ebb_table); + } + +#if DEBUG + if (relax_info->action_list.head) + print_action_list (stderr, &relax_info->action_list); +#endif + +error_return: + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + if (prop_table) + free (prop_table); + if (reloc_opcodes) + free (reloc_opcodes); + + return ok; +} + + +/* Do not widen an instruction if it is preceeded by a + loop opcode. It might cause misalignment. */ + +static bfd_boolean +prev_instr_is_a_loop (bfd_byte *contents, + bfd_size_type content_length, + bfd_size_type offset) +{ + xtensa_opcode prev_opcode; + + if (offset < 3) + return FALSE; + prev_opcode = insn_decode_opcode (contents, content_length, offset-3, 0); + return (xtensa_opcode_is_loop (xtensa_default_isa, prev_opcode) == 1); +} + + +/* Find all of the possible actions for an extended basic block. */ + +bfd_boolean +compute_ebb_proposed_actions (ebb_constraint *ebb_table) +{ + const ebb_t *ebb = &ebb_table->ebb; + unsigned rel_idx = ebb->start_reloc_idx; + property_table_entry *entry, *start_entry, *end_entry; + bfd_vma offset = 0; + xtensa_isa isa = xtensa_default_isa; + xtensa_format fmt; + static xtensa_insnbuf insnbuf = NULL; + static xtensa_insnbuf slotbuf = NULL; + + if (insnbuf == NULL) + { + insnbuf = xtensa_insnbuf_alloc (isa); + slotbuf = xtensa_insnbuf_alloc (isa); + } + + start_entry = &ebb->ptbl[ebb->start_ptbl_idx]; + end_entry = &ebb->ptbl[ebb->end_ptbl_idx]; + + for (entry = start_entry; entry <= end_entry; entry++) + { + bfd_vma start_offset, end_offset; + bfd_size_type insn_len; + + start_offset = entry->address - ebb->sec->vma; + end_offset = entry->address + entry->size - ebb->sec->vma; + + if (entry == start_entry) + start_offset = ebb->start_offset; + if (entry == end_entry) + end_offset = ebb->end_offset; + offset = start_offset; + + if (offset == entry->address - ebb->sec->vma + && (entry->flags & XTENSA_PROP_INSN_BRANCH_TARGET) != 0) + { + enum ebb_target_enum align_type = EBB_DESIRE_TGT_ALIGN; + BFD_ASSERT (offset != end_offset); + if (offset == end_offset) + return FALSE; + + insn_len = insn_decode_len (ebb->contents, ebb->content_length, + offset); + if (insn_len == 0) + goto decode_error; + + if (check_branch_target_aligned_address (offset, insn_len)) + align_type = EBB_REQUIRE_TGT_ALIGN; + + ebb_propose_action (ebb_table, align_type, 0, + ta_none, offset, 0, TRUE); + } + + while (offset != end_offset) + { + Elf_Internal_Rela *irel; + xtensa_opcode opcode; + + while (rel_idx < ebb->end_reloc_idx + && (ebb->relocs[rel_idx].r_offset < offset + || (ebb->relocs[rel_idx].r_offset == offset + && (ELF32_R_TYPE (ebb->relocs[rel_idx].r_info) + != R_XTENSA_ASM_SIMPLIFY)))) + rel_idx++; + + /* Check for longcall. */ + irel = &ebb->relocs[rel_idx]; + if (irel->r_offset == offset + && ELF32_R_TYPE (irel->r_info) == R_XTENSA_ASM_SIMPLIFY) + { + bfd_size_type simplify_size; + + simplify_size = get_asm_simplify_size (ebb->contents, + ebb->content_length, + irel->r_offset); + if (simplify_size == 0) + goto decode_error; + + ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0, + ta_convert_longcall, offset, 0, TRUE); + + offset += simplify_size; + continue; + } + + if (offset + MIN_INSN_LENGTH > ebb->content_length) + goto decode_error; + xtensa_insnbuf_from_chars (isa, insnbuf, &ebb->contents[offset], + ebb->content_length - offset); + fmt = xtensa_format_decode (isa, insnbuf); + if (fmt == XTENSA_UNDEFINED) + goto decode_error; + insn_len = xtensa_format_length (isa, fmt); + if (insn_len == (bfd_size_type) XTENSA_UNDEFINED) + goto decode_error; + + if (xtensa_format_num_slots (isa, fmt) != 1) + { + offset += insn_len; + continue; + } + + xtensa_format_get_slot (isa, fmt, 0, insnbuf, slotbuf); + opcode = xtensa_opcode_decode (isa, fmt, 0, slotbuf); + if (opcode == XTENSA_UNDEFINED) + goto decode_error; + + if ((entry->flags & XTENSA_PROP_INSN_NO_DENSITY) == 0 + && (entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0 + && can_narrow_instruction (slotbuf, fmt, opcode) != 0) + { + /* Add an instruction narrow action. */ + ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0, + ta_narrow_insn, offset, 0, FALSE); + } + else if ((entry->flags & XTENSA_PROP_NO_TRANSFORM) == 0 + && can_widen_instruction (slotbuf, fmt, opcode) != 0 + && ! prev_instr_is_a_loop (ebb->contents, + ebb->content_length, offset)) + { + /* Add an instruction widen action. */ + ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0, + ta_widen_insn, offset, 0, FALSE); + } + else if (xtensa_opcode_is_loop (xtensa_default_isa, opcode) == 1) + { + /* Check for branch targets. */ + ebb_propose_action (ebb_table, EBB_REQUIRE_LOOP_ALIGN, 0, + ta_none, offset, 0, TRUE); + } + + offset += insn_len; + } + } + + if (ebb->ends_unreachable) + { + ebb_propose_action (ebb_table, EBB_NO_ALIGN, 0, + ta_fill, ebb->end_offset, 0, TRUE); + } + + return TRUE; + + decode_error: + (*_bfd_error_handler) + (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"), + ebb->sec->owner, ebb->sec, offset); + return FALSE; +} + + +/* After all of the information has collected about the + transformations possible in an EBB, compute the appropriate actions + here in compute_ebb_actions. We still must check later to make + sure that the actions do not break any relocations. The algorithm + used here is pretty greedy. Basically, it removes as many no-ops + as possible so that the end of the EBB has the same alignment + characteristics as the original. First, it uses narrowing, then + fill space at the end of the EBB, and finally widenings. If that + does not work, it tries again with one fewer no-op removed. The + optimization will only be performed if all of the branch targets + that were aligned before transformation are also aligned after the + transformation. + + When the size_opt flag is set, ignore the branch target alignments, + narrow all wide instructions, and remove all no-ops unless the end + of the EBB prevents it. */ + +bfd_boolean +compute_ebb_actions (ebb_constraint *ebb_table) +{ + unsigned i = 0; + unsigned j; + int removed_bytes = 0; + ebb_t *ebb = &ebb_table->ebb; + unsigned seg_idx_start = 0; + unsigned seg_idx_end = 0; + + /* We perform this like the assembler relaxation algorithm: Start by + assuming all instructions are narrow and all no-ops removed; then + walk through.... */ + + /* For each segment of this that has a solid constraint, check to + see if there are any combinations that will keep the constraint. + If so, use it. */ + for (seg_idx_end = 0; seg_idx_end < ebb_table->action_count; seg_idx_end++) + { + bfd_boolean requires_text_end_align = FALSE; + unsigned longcall_count = 0; + unsigned longcall_convert_count = 0; + unsigned narrowable_count = 0; + unsigned narrowable_convert_count = 0; + unsigned widenable_count = 0; + unsigned widenable_convert_count = 0; + + proposed_action *action = NULL; + int align = (1 << ebb_table->ebb.sec->alignment_power); + + seg_idx_start = seg_idx_end; + + for (i = seg_idx_start; i < ebb_table->action_count; i++) + { + action = &ebb_table->actions[i]; + if (action->action == ta_convert_longcall) + longcall_count++; + if (action->action == ta_narrow_insn) + narrowable_count++; + if (action->action == ta_widen_insn) + widenable_count++; + if (action->action == ta_fill) + break; + if (action->align_type == EBB_REQUIRE_LOOP_ALIGN) + break; + if (action->align_type == EBB_REQUIRE_TGT_ALIGN + && !elf32xtensa_size_opt) + break; + } + seg_idx_end = i; + + if (seg_idx_end == ebb_table->action_count && !ebb->ends_unreachable) + requires_text_end_align = TRUE; + + if (elf32xtensa_size_opt && !requires_text_end_align + && action->align_type != EBB_REQUIRE_LOOP_ALIGN + && action->align_type != EBB_REQUIRE_TGT_ALIGN) + { + longcall_convert_count = longcall_count; + narrowable_convert_count = narrowable_count; + widenable_convert_count = 0; + } + else + { + /* There is a constraint. Convert the max number of longcalls. */ + narrowable_convert_count = 0; + longcall_convert_count = 0; + widenable_convert_count = 0; + + for (j = 0; j < longcall_count; j++) + { + int removed = (longcall_count - j) * 3 & (align - 1); + unsigned desire_narrow = (align - removed) & (align - 1); + unsigned desire_widen = removed; + if (desire_narrow <= narrowable_count) + { + narrowable_convert_count = desire_narrow; + narrowable_convert_count += + (align * ((narrowable_count - narrowable_convert_count) + / align)); + longcall_convert_count = (longcall_count - j); + widenable_convert_count = 0; + break; + } + if (desire_widen <= widenable_count && !elf32xtensa_size_opt) + { + narrowable_convert_count = 0; + longcall_convert_count = longcall_count - j; + widenable_convert_count = desire_widen; + break; + } + } + } + + /* Now the number of conversions are saved. Do them. */ + for (i = seg_idx_start; i < seg_idx_end; i++) + { + action = &ebb_table->actions[i]; + switch (action->action) + { + case ta_convert_longcall: + if (longcall_convert_count != 0) + { + action->action = ta_remove_longcall; + action->do_action = TRUE; + action->removed_bytes += 3; + longcall_convert_count--; + } + break; + case ta_narrow_insn: + if (narrowable_convert_count != 0) + { + action->do_action = TRUE; + action->removed_bytes += 1; + narrowable_convert_count--; + } + break; + case ta_widen_insn: + if (widenable_convert_count != 0) + { + action->do_action = TRUE; + action->removed_bytes -= 1; + widenable_convert_count--; + } + break; + default: + break; + } + } + } + + /* Now we move on to some local opts. Try to remove each of the + remaining longcalls. */ + + if (ebb_table->ebb.ends_section || ebb_table->ebb.ends_unreachable) + { + removed_bytes = 0; + for (i = 0; i < ebb_table->action_count; i++) + { + int old_removed_bytes = removed_bytes; + proposed_action *action = &ebb_table->actions[i]; + + if (action->do_action && action->action == ta_convert_longcall) + { + bfd_boolean bad_alignment = FALSE; + removed_bytes += 3; + for (j = i + 1; j < ebb_table->action_count; j++) + { + proposed_action *new_action = &ebb_table->actions[j]; + bfd_vma offset = new_action->offset; + if (new_action->align_type == EBB_REQUIRE_TGT_ALIGN) + { + if (!check_branch_target_aligned + (ebb_table->ebb.contents, + ebb_table->ebb.content_length, + offset, offset - removed_bytes)) + { + bad_alignment = TRUE; + break; + } + } + if (new_action->align_type == EBB_REQUIRE_LOOP_ALIGN) + { + if (!check_loop_aligned (ebb_table->ebb.contents, + ebb_table->ebb.content_length, + offset, + offset - removed_bytes)) + { + bad_alignment = TRUE; + break; + } + } + if (new_action->action == ta_narrow_insn + && !new_action->do_action + && ebb_table->ebb.sec->alignment_power == 2) + { + /* Narrow an instruction and we are done. */ + new_action->do_action = TRUE; + new_action->removed_bytes += 1; + bad_alignment = FALSE; + break; + } + if (new_action->action == ta_widen_insn + && new_action->do_action + && ebb_table->ebb.sec->alignment_power == 2) + { + /* Narrow an instruction and we are done. */ + new_action->do_action = FALSE; + new_action->removed_bytes += 1; + bad_alignment = FALSE; + break; + } + if (new_action->do_action) + removed_bytes += new_action->removed_bytes; + } + if (!bad_alignment) + { + action->removed_bytes += 3; + action->action = ta_remove_longcall; + action->do_action = TRUE; + } + } + removed_bytes = old_removed_bytes; + if (action->do_action) + removed_bytes += action->removed_bytes; + } + } + + removed_bytes = 0; + for (i = 0; i < ebb_table->action_count; ++i) + { + proposed_action *action = &ebb_table->actions[i]; + if (action->do_action) + removed_bytes += action->removed_bytes; + } + + if ((removed_bytes % (1 << ebb_table->ebb.sec->alignment_power)) != 0 + && ebb->ends_unreachable) + { + proposed_action *action; + int br; + int extra_space; + + BFD_ASSERT (ebb_table->action_count != 0); + action = &ebb_table->actions[ebb_table->action_count - 1]; + BFD_ASSERT (action->action == ta_fill); + BFD_ASSERT (ebb->ends_unreachable->flags & XTENSA_PROP_UNREACHABLE); + + extra_space = compute_fill_extra_space (ebb->ends_unreachable); + br = action->removed_bytes + removed_bytes + extra_space; + br = br & ((1 << ebb->sec->alignment_power ) - 1); + + action->removed_bytes = extra_space - br; + } + return TRUE; +} + + +/* The xlate_map is a sorted array of address mappings designed to + answer the offset_with_removed_text() query with a binary search instead + of a linear search through the section's action_list. */ + +typedef struct xlate_map_entry xlate_map_entry_t; +typedef struct xlate_map xlate_map_t; + +struct xlate_map_entry +{ + unsigned orig_address; + unsigned new_address; + unsigned size; +}; + +struct xlate_map +{ + unsigned entry_count; + xlate_map_entry_t *entry; +}; + + +static int +xlate_compare (const void *a_v, const void *b_v) +{ + const xlate_map_entry_t *a = (const xlate_map_entry_t *) a_v; + const xlate_map_entry_t *b = (const xlate_map_entry_t *) b_v; + if (a->orig_address < b->orig_address) + return -1; + if (a->orig_address > (b->orig_address + b->size - 1)) + return 1; + return 0; +} + + +static bfd_vma +xlate_offset_with_removed_text (const xlate_map_t *map, + text_action_list *action_list, + bfd_vma offset) +{ + void *r; + xlate_map_entry_t *e; + + if (map == NULL) + return offset_with_removed_text (action_list, offset); + + if (map->entry_count == 0) + return offset; + + r = bsearch (&offset, map->entry, map->entry_count, + sizeof (xlate_map_entry_t), &xlate_compare); + e = (xlate_map_entry_t *) r; + + BFD_ASSERT (e != NULL); + if (e == NULL) + return offset; + return e->new_address - e->orig_address + offset; +} + + +/* Build a binary searchable offset translation map from a section's + action list. */ + +static xlate_map_t * +build_xlate_map (asection *sec, xtensa_relax_info *relax_info) +{ + xlate_map_t *map = (xlate_map_t *) bfd_malloc (sizeof (xlate_map_t)); + text_action_list *action_list = &relax_info->action_list; + unsigned num_actions = 0; + text_action *r; + int removed; + xlate_map_entry_t *current_entry; + + if (map == NULL) + return NULL; + + num_actions = action_list_count (action_list); + map->entry = (xlate_map_entry_t *) + bfd_malloc (sizeof (xlate_map_entry_t) * (num_actions + 1)); + if (map->entry == NULL) + { + free (map); + return NULL; + } + map->entry_count = 0; + + removed = 0; + current_entry = &map->entry[0]; + + current_entry->orig_address = 0; + current_entry->new_address = 0; + current_entry->size = 0; + + for (r = action_list->head; r != NULL; r = r->next) + { + unsigned orig_size = 0; + switch (r->action) + { + case ta_none: + case ta_remove_insn: + case ta_convert_longcall: + case ta_remove_literal: + case ta_add_literal: + break; + case ta_remove_longcall: + orig_size = 6; + break; + case ta_narrow_insn: + orig_size = 3; + break; + case ta_widen_insn: + orig_size = 2; + break; + case ta_fill: + break; + } + current_entry->size = + r->offset + orig_size - current_entry->orig_address; + if (current_entry->size != 0) + { + current_entry++; + map->entry_count++; + } + current_entry->orig_address = r->offset + orig_size; + removed += r->removed_bytes; + current_entry->new_address = r->offset + orig_size - removed; + current_entry->size = 0; + } + + current_entry->size = (bfd_get_section_limit (sec->owner, sec) + - current_entry->orig_address); + if (current_entry->size != 0) + map->entry_count++; + + return map; +} + + +/* Free an offset translation map. */ + +static void +free_xlate_map (xlate_map_t *map) +{ + if (map && map->entry) + free (map->entry); + if (map) + free (map); +} + + +/* Use check_section_ebb_pcrels_fit to make sure that all of the + relocations in a section will fit if a proposed set of actions + are performed. */ + +static bfd_boolean +check_section_ebb_pcrels_fit (bfd *abfd, + asection *sec, + bfd_byte *contents, + Elf_Internal_Rela *internal_relocs, + const ebb_constraint *constraint, + const xtensa_opcode *reloc_opcodes) +{ + unsigned i, j; + Elf_Internal_Rela *irel; + xlate_map_t *xmap = NULL; + bfd_boolean ok = TRUE; + xtensa_relax_info *relax_info; + + relax_info = get_xtensa_relax_info (sec); + + if (relax_info && sec->reloc_count > 100) + { + xmap = build_xlate_map (sec, relax_info); + /* NULL indicates out of memory, but the slow version + can still be used. */ + } + + for (i = 0; i < sec->reloc_count; i++) + { + r_reloc r_rel; + bfd_vma orig_self_offset, orig_target_offset; + bfd_vma self_offset, target_offset; + int r_type; + reloc_howto_type *howto; + int self_removed_bytes, target_removed_bytes; + + irel = &internal_relocs[i]; + r_type = ELF32_R_TYPE (irel->r_info); + + howto = &elf_howto_table[r_type]; + /* We maintain the required invariant: PC-relative relocations + that fit before linking must fit after linking. Thus we only + need to deal with relocations to the same section that are + PC-relative. */ + if (r_type == R_XTENSA_ASM_SIMPLIFY + || r_type == R_XTENSA_32_PCREL + || !howto->pc_relative) + continue; + + r_reloc_init (&r_rel, abfd, irel, contents, + bfd_get_section_limit (abfd, sec)); + + if (r_reloc_get_section (&r_rel) != sec) + continue; + + orig_self_offset = irel->r_offset; + orig_target_offset = r_rel.target_offset; + + self_offset = orig_self_offset; + target_offset = orig_target_offset; + + if (relax_info) + { + self_offset = + xlate_offset_with_removed_text (xmap, &relax_info->action_list, + orig_self_offset); + target_offset = + xlate_offset_with_removed_text (xmap, &relax_info->action_list, + orig_target_offset); + } + + self_removed_bytes = 0; + target_removed_bytes = 0; + + for (j = 0; j < constraint->action_count; ++j) + { + proposed_action *action = &constraint->actions[j]; + bfd_vma offset = action->offset; + int removed_bytes = action->removed_bytes; + if (offset < orig_self_offset + || (offset == orig_self_offset && action->action == ta_fill + && action->removed_bytes < 0)) + self_removed_bytes += removed_bytes; + if (offset < orig_target_offset + || (offset == orig_target_offset && action->action == ta_fill + && action->removed_bytes < 0)) + target_removed_bytes += removed_bytes; + } + self_offset -= self_removed_bytes; + target_offset -= target_removed_bytes; + + /* Try to encode it. Get the operand and check. */ + if (is_alt_relocation (ELF32_R_TYPE (irel->r_info))) + { + /* None of the current alternate relocs are PC-relative, + and only PC-relative relocs matter here. */ + } + else + { + xtensa_opcode opcode; + int opnum; + + if (reloc_opcodes) + opcode = reloc_opcodes[i]; + else + opcode = get_relocation_opcode (abfd, sec, contents, irel); + if (opcode == XTENSA_UNDEFINED) + { + ok = FALSE; + break; + } + + opnum = get_relocation_opnd (opcode, ELF32_R_TYPE (irel->r_info)); + if (opnum == XTENSA_UNDEFINED) + { + ok = FALSE; + break; + } + + if (!pcrel_reloc_fits (opcode, opnum, self_offset, target_offset)) + { + ok = FALSE; + break; + } + } + } + + if (xmap) + free_xlate_map (xmap); + + return ok; +} + + +static bfd_boolean +check_section_ebb_reduces (const ebb_constraint *constraint) +{ + int removed = 0; + unsigned i; + + for (i = 0; i < constraint->action_count; i++) + { + const proposed_action *action = &constraint->actions[i]; + if (action->do_action) + removed += action->removed_bytes; + } + if (removed < 0) + return FALSE; + + return TRUE; +} + + +void +text_action_add_proposed (text_action_list *l, + const ebb_constraint *ebb_table, + asection *sec) +{ + unsigned i; + + for (i = 0; i < ebb_table->action_count; i++) + { + proposed_action *action = &ebb_table->actions[i]; + + if (!action->do_action) + continue; + switch (action->action) + { + case ta_remove_insn: + case ta_remove_longcall: + case ta_convert_longcall: + case ta_narrow_insn: + case ta_widen_insn: + case ta_fill: + case ta_remove_literal: + text_action_add (l, action->action, sec, action->offset, + action->removed_bytes); + break; + case ta_none: + break; + default: + BFD_ASSERT (0); + break; + } + } +} + + +int +compute_fill_extra_space (property_table_entry *entry) +{ + int fill_extra_space; + + if (!entry) + return 0; + + if ((entry->flags & XTENSA_PROP_UNREACHABLE) == 0) + return 0; + + fill_extra_space = entry->size; + if ((entry->flags & XTENSA_PROP_ALIGN) != 0) + { + /* Fill bytes for alignment: + (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */ + int pow = GET_XTENSA_PROP_ALIGNMENT (entry->flags); + int nsm = (1 << pow) - 1; + bfd_vma addr = entry->address + entry->size; + bfd_vma align_fill = nsm - ((addr + nsm) & nsm); + fill_extra_space += align_fill; + } + return fill_extra_space; +} + + +/* First relaxation pass. */ + +/* If the section contains relaxable literals, check each literal to + see if it has the same value as another literal that has already + been seen, either in the current section or a previous one. If so, + add an entry to the per-section list of removed literals. The + actual changes are deferred until the next pass. */ + +static bfd_boolean +compute_removed_literals (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info, + value_map_hash_table *values) +{ + xtensa_relax_info *relax_info; + bfd_byte *contents; + Elf_Internal_Rela *internal_relocs; + source_reloc *src_relocs, *rel; + bfd_boolean ok = TRUE; + property_table_entry *prop_table = NULL; + int ptblsize; + int i, prev_i; + bfd_boolean last_loc_is_prev = FALSE; + bfd_vma last_target_offset = 0; + section_cache_t target_sec_cache; + bfd_size_type sec_size; + + init_section_cache (&target_sec_cache); + + /* Do nothing if it is not a relaxable literal section. */ + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + if (!relax_info->is_relaxable_literal_section) + return ok; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + + sec_size = bfd_get_section_limit (abfd, sec); + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec_size != 0) + { + ok = FALSE; + goto error_return; + } + + /* Sort the source_relocs by target offset. */ + src_relocs = relax_info->src_relocs; + qsort (src_relocs, relax_info->src_count, + sizeof (source_reloc), source_reloc_compare); + qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), + internal_reloc_compare); + + ptblsize = xtensa_read_table_entries (abfd, sec, &prop_table, + XTENSA_PROP_SEC_NAME, FALSE); + if (ptblsize < 0) + { + ok = FALSE; + goto error_return; + } + + prev_i = -1; + for (i = 0; i < relax_info->src_count; i++) + { + Elf_Internal_Rela *irel = NULL; + + rel = &src_relocs[i]; + if (get_l32r_opcode () != rel->opcode) + continue; + irel = get_irel_at_offset (sec, internal_relocs, + rel->r_rel.target_offset); + + /* If the relocation on this is not a simple R_XTENSA_32 or + R_XTENSA_PLT then do not consider it. This may happen when + the difference of two symbols is used in a literal. */ + if (irel && (ELF32_R_TYPE (irel->r_info) != R_XTENSA_32 + && ELF32_R_TYPE (irel->r_info) != R_XTENSA_PLT)) + continue; + + /* If the target_offset for this relocation is the same as the + previous relocation, then we've already considered whether the + literal can be coalesced. Skip to the next one.... */ + if (i != 0 && prev_i != -1 + && src_relocs[i-1].r_rel.target_offset == rel->r_rel.target_offset) + continue; + prev_i = i; + + if (last_loc_is_prev && + last_target_offset + 4 != rel->r_rel.target_offset) + last_loc_is_prev = FALSE; + + /* Check if the relocation was from an L32R that is being removed + because a CALLX was converted to a direct CALL, and check if + there are no other relocations to the literal. */ + if (is_removable_literal (rel, i, src_relocs, relax_info->src_count, + sec, prop_table, ptblsize)) + { + if (!remove_dead_literal (abfd, sec, link_info, internal_relocs, + irel, rel, prop_table, ptblsize)) + { + ok = FALSE; + goto error_return; + } + last_target_offset = rel->r_rel.target_offset; + continue; + } + + if (!identify_literal_placement (abfd, sec, contents, link_info, + values, + &last_loc_is_prev, irel, + relax_info->src_count - i, rel, + prop_table, ptblsize, + &target_sec_cache, rel->is_abs_literal)) + { + ok = FALSE; + goto error_return; + } + last_target_offset = rel->r_rel.target_offset; + } + +#if DEBUG + print_removed_literals (stderr, &relax_info->removed_list); + print_action_list (stderr, &relax_info->action_list); +#endif /* DEBUG */ + +error_return: + if (prop_table) + free (prop_table); + free_section_cache (&target_sec_cache); + + release_contents (sec, contents); + release_internal_relocs (sec, internal_relocs); + return ok; +} + + +static Elf_Internal_Rela * +get_irel_at_offset (asection *sec, + Elf_Internal_Rela *internal_relocs, + bfd_vma offset) +{ + unsigned i; + Elf_Internal_Rela *irel; + unsigned r_type; + Elf_Internal_Rela key; + + if (!internal_relocs) + return NULL; + + key.r_offset = offset; + irel = bsearch (&key, internal_relocs, sec->reloc_count, + sizeof (Elf_Internal_Rela), internal_reloc_matches); + if (!irel) + return NULL; + + /* bsearch does not guarantee which will be returned if there are + multiple matches. We need the first that is not an alignment. */ + i = irel - internal_relocs; + while (i > 0) + { + if (internal_relocs[i-1].r_offset != offset) + break; + i--; + } + for ( ; i < sec->reloc_count; i++) + { + irel = &internal_relocs[i]; + r_type = ELF32_R_TYPE (irel->r_info); + if (irel->r_offset == offset && r_type != R_XTENSA_NONE) + return irel; + } + + return NULL; +} + + +bfd_boolean +is_removable_literal (const source_reloc *rel, + int i, + const source_reloc *src_relocs, + int src_count, + asection *sec, + property_table_entry *prop_table, + int ptblsize) +{ + const source_reloc *curr_rel; + property_table_entry *entry; + + if (!rel->is_null) + return FALSE; + + entry = elf_xtensa_find_property_entry (prop_table, ptblsize, + sec->vma + rel->r_rel.target_offset); + if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM)) + return FALSE; + + for (++i; i < src_count; ++i) + { + curr_rel = &src_relocs[i]; + /* If all others have the same target offset.... */ + if (curr_rel->r_rel.target_offset != rel->r_rel.target_offset) + return TRUE; + + if (!curr_rel->is_null + && !xtensa_is_property_section (curr_rel->source_sec) + && !(curr_rel->source_sec->flags & SEC_DEBUGGING)) + return FALSE; + } + return TRUE; +} + + +bfd_boolean +remove_dead_literal (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info, + Elf_Internal_Rela *internal_relocs, + Elf_Internal_Rela *irel, + source_reloc *rel, + property_table_entry *prop_table, + int ptblsize) +{ + property_table_entry *entry; + xtensa_relax_info *relax_info; + + relax_info = get_xtensa_relax_info (sec); + if (!relax_info) + return FALSE; + + entry = elf_xtensa_find_property_entry (prop_table, ptblsize, + sec->vma + rel->r_rel.target_offset); + + /* Mark the unused literal so that it will be removed. */ + add_removed_literal (&relax_info->removed_list, &rel->r_rel, NULL); + + text_action_add (&relax_info->action_list, + ta_remove_literal, sec, rel->r_rel.target_offset, 4); + + /* If the section is 4-byte aligned, do not add fill. */ + if (sec->alignment_power > 2) + { + int fill_extra_space; + bfd_vma entry_sec_offset; + text_action *fa; + property_table_entry *the_add_entry; + int removed_diff; + + if (entry) + entry_sec_offset = entry->address - sec->vma + entry->size; + else + entry_sec_offset = rel->r_rel.target_offset + 4; + + /* If the literal range is at the end of the section, + do not add fill. */ + the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize, + entry_sec_offset); + fill_extra_space = compute_fill_extra_space (the_add_entry); + + fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset); + removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset, + -4, fill_extra_space); + if (fa) + adjust_fill_action (fa, removed_diff); + else + text_action_add (&relax_info->action_list, + ta_fill, sec, entry_sec_offset, removed_diff); + } + + /* Zero out the relocation on this literal location. */ + if (irel) + { + if (elf_hash_table (link_info)->dynamic_sections_created) + shrink_dynamic_reloc_sections (link_info, abfd, sec, irel); + + irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + pin_internal_relocs (sec, internal_relocs); + } + + /* Do not modify "last_loc_is_prev". */ + return TRUE; +} + + +bfd_boolean +identify_literal_placement (bfd *abfd, + asection *sec, + bfd_byte *contents, + struct bfd_link_info *link_info, + value_map_hash_table *values, + bfd_boolean *last_loc_is_prev_p, + Elf_Internal_Rela *irel, + int remaining_src_rels, + source_reloc *rel, + property_table_entry *prop_table, + int ptblsize, + section_cache_t *target_sec_cache, + bfd_boolean is_abs_literal) +{ + literal_value val; + value_map *val_map; + xtensa_relax_info *relax_info; + bfd_boolean literal_placed = FALSE; + r_reloc r_rel; + unsigned long value; + bfd_boolean final_static_link; + bfd_size_type sec_size; + + relax_info = get_xtensa_relax_info (sec); + if (!relax_info) + return FALSE; + + sec_size = bfd_get_section_limit (abfd, sec); + + final_static_link = + (!link_info->relocatable + && !elf_hash_table (link_info)->dynamic_sections_created); + + /* The placement algorithm first checks to see if the literal is + already in the value map. If so and the value map is reachable + from all uses, then the literal is moved to that location. If + not, then we identify the last location where a fresh literal was + placed. If the literal can be safely moved there, then we do so. + If not, then we assume that the literal is not to move and leave + the literal where it is, marking it as the last literal + location. */ + + /* Find the literal value. */ + value = 0; + r_reloc_init (&r_rel, abfd, irel, contents, sec_size); + if (!irel) + { + BFD_ASSERT (rel->r_rel.target_offset < sec_size); + value = bfd_get_32 (abfd, contents + rel->r_rel.target_offset); + } + init_literal_value (&val, &r_rel, value, is_abs_literal); + + /* Check if we've seen another literal with the same value that + is in the same output section. */ + val_map = value_map_get_cached_value (values, &val, final_static_link); + + if (val_map + && (r_reloc_get_section (&val_map->loc)->output_section + == sec->output_section) + && relocations_reach (rel, remaining_src_rels, &val_map->loc) + && coalesce_shared_literal (sec, rel, prop_table, ptblsize, val_map)) + { + /* No change to last_loc_is_prev. */ + literal_placed = TRUE; + } + + /* For relocatable links, do not try to move literals. To do it + correctly might increase the number of relocations in an input + section making the default relocatable linking fail. */ + if (!link_info->relocatable && !literal_placed + && values->has_last_loc && !(*last_loc_is_prev_p)) + { + asection *target_sec = r_reloc_get_section (&values->last_loc); + if (target_sec && target_sec->output_section == sec->output_section) + { + /* Increment the virtual offset. */ + r_reloc try_loc = values->last_loc; + try_loc.virtual_offset += 4; + + /* There is a last loc that was in the same output section. */ + if (relocations_reach (rel, remaining_src_rels, &try_loc) + && move_shared_literal (sec, link_info, rel, + prop_table, ptblsize, + &try_loc, &val, target_sec_cache)) + { + values->last_loc.virtual_offset += 4; + literal_placed = TRUE; + if (!val_map) + val_map = add_value_map (values, &val, &try_loc, + final_static_link); + else + val_map->loc = try_loc; + } + } + } + + if (!literal_placed) + { + /* Nothing worked, leave the literal alone but update the last loc. */ + values->has_last_loc = TRUE; + values->last_loc = rel->r_rel; + if (!val_map) + val_map = add_value_map (values, &val, &rel->r_rel, final_static_link); + else + val_map->loc = rel->r_rel; + *last_loc_is_prev_p = TRUE; + } + + return TRUE; +} + + +/* Check if the original relocations (presumably on L32R instructions) + identified by reloc[0..N] can be changed to reference the literal + identified by r_rel. If r_rel is out of range for any of the + original relocations, then we don't want to coalesce the original + literal with the one at r_rel. We only check reloc[0..N], where the + offsets are all the same as for reloc[0] (i.e., they're all + referencing the same literal) and where N is also bounded by the + number of remaining entries in the "reloc" array. The "reloc" array + is sorted by target offset so we know all the entries for the same + literal will be contiguous. */ + +static bfd_boolean +relocations_reach (source_reloc *reloc, + int remaining_relocs, + const r_reloc *r_rel) +{ + bfd_vma from_offset, source_address, dest_address; + asection *sec; + int i; + + if (!r_reloc_is_defined (r_rel)) + return FALSE; + + sec = r_reloc_get_section (r_rel); + from_offset = reloc[0].r_rel.target_offset; + + for (i = 0; i < remaining_relocs; i++) + { + if (reloc[i].r_rel.target_offset != from_offset) + break; + + /* Ignore relocations that have been removed. */ + if (reloc[i].is_null) + continue; + + /* The original and new output section for these must be the same + in order to coalesce. */ + if (r_reloc_get_section (&reloc[i].r_rel)->output_section + != sec->output_section) + return FALSE; + + /* Absolute literals in the same output section can always be + combined. */ + if (reloc[i].is_abs_literal) + continue; + + /* A literal with no PC-relative relocations can be moved anywhere. */ + if (reloc[i].opnd != -1) + { + /* Otherwise, check to see that it fits. */ + source_address = (reloc[i].source_sec->output_section->vma + + reloc[i].source_sec->output_offset + + reloc[i].r_rel.rela.r_offset); + dest_address = (sec->output_section->vma + + sec->output_offset + + r_rel->target_offset); + + if (!pcrel_reloc_fits (reloc[i].opcode, reloc[i].opnd, + source_address, dest_address)) + return FALSE; + } + } + + return TRUE; +} + + +/* Move a literal to another literal location because it is + the same as the other literal value. */ + +static bfd_boolean +coalesce_shared_literal (asection *sec, + source_reloc *rel, + property_table_entry *prop_table, + int ptblsize, + value_map *val_map) +{ + property_table_entry *entry; + text_action *fa; + property_table_entry *the_add_entry; + int removed_diff; + xtensa_relax_info *relax_info; + + relax_info = get_xtensa_relax_info (sec); + if (!relax_info) + return FALSE; + + entry = elf_xtensa_find_property_entry + (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset); + if (entry && (entry->flags & XTENSA_PROP_NO_TRANSFORM)) + return TRUE; + + /* Mark that the literal will be coalesced. */ + add_removed_literal (&relax_info->removed_list, &rel->r_rel, &val_map->loc); + + text_action_add (&relax_info->action_list, + ta_remove_literal, sec, rel->r_rel.target_offset, 4); + + /* If the section is 4-byte aligned, do not add fill. */ + if (sec->alignment_power > 2) + { + int fill_extra_space; + bfd_vma entry_sec_offset; + + if (entry) + entry_sec_offset = entry->address - sec->vma + entry->size; + else + entry_sec_offset = rel->r_rel.target_offset + 4; + + /* If the literal range is at the end of the section, + do not add fill. */ + fill_extra_space = 0; + the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize, + entry_sec_offset); + if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE)) + fill_extra_space = the_add_entry->size; + + fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset); + removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset, + -4, fill_extra_space); + if (fa) + adjust_fill_action (fa, removed_diff); + else + text_action_add (&relax_info->action_list, + ta_fill, sec, entry_sec_offset, removed_diff); + } + + return TRUE; +} + + +/* Move a literal to another location. This may actually increase the + total amount of space used because of alignments so we need to do + this carefully. Also, it may make a branch go out of range. */ + +static bfd_boolean +move_shared_literal (asection *sec, + struct bfd_link_info *link_info, + source_reloc *rel, + property_table_entry *prop_table, + int ptblsize, + const r_reloc *target_loc, + const literal_value *lit_value, + section_cache_t *target_sec_cache) +{ + property_table_entry *the_add_entry, *src_entry, *target_entry = NULL; + text_action *fa, *target_fa; + int removed_diff; + xtensa_relax_info *relax_info, *target_relax_info; + asection *target_sec; + ebb_t *ebb; + ebb_constraint ebb_table; + bfd_boolean relocs_fit; + + /* If this routine always returns FALSE, the literals that cannot be + coalesced will not be moved. */ + if (elf32xtensa_no_literal_movement) + return FALSE; + + relax_info = get_xtensa_relax_info (sec); + if (!relax_info) + return FALSE; + + target_sec = r_reloc_get_section (target_loc); + target_relax_info = get_xtensa_relax_info (target_sec); + + /* Literals to undefined sections may not be moved because they + must report an error. */ + if (bfd_is_und_section (target_sec)) + return FALSE; + + src_entry = elf_xtensa_find_property_entry + (prop_table, ptblsize, sec->vma + rel->r_rel.target_offset); + + if (!section_cache_section (target_sec_cache, target_sec, link_info)) + return FALSE; + + target_entry = elf_xtensa_find_property_entry + (target_sec_cache->ptbl, target_sec_cache->pte_count, + target_sec->vma + target_loc->target_offset); + + if (!target_entry) + return FALSE; + + /* Make sure that we have not broken any branches. */ + relocs_fit = FALSE; + + init_ebb_constraint (&ebb_table); + ebb = &ebb_table.ebb; + init_ebb (ebb, target_sec_cache->sec, target_sec_cache->contents, + target_sec_cache->content_length, + target_sec_cache->ptbl, target_sec_cache->pte_count, + target_sec_cache->relocs, target_sec_cache->reloc_count); + + /* Propose to add 4 bytes + worst-case alignment size increase to + destination. */ + ebb_propose_action (&ebb_table, EBB_NO_ALIGN, 0, + ta_fill, target_loc->target_offset, + -4 - (1 << target_sec->alignment_power), TRUE); + + /* Check all of the PC-relative relocations to make sure they still fit. */ + relocs_fit = check_section_ebb_pcrels_fit (target_sec->owner, target_sec, + target_sec_cache->contents, + target_sec_cache->relocs, + &ebb_table, NULL); + + if (!relocs_fit) + return FALSE; + + text_action_add_literal (&target_relax_info->action_list, + ta_add_literal, target_loc, lit_value, -4); + + if (target_sec->alignment_power > 2 && target_entry != src_entry) + { + /* May need to add or remove some fill to maintain alignment. */ + int fill_extra_space; + bfd_vma entry_sec_offset; + + entry_sec_offset = + target_entry->address - target_sec->vma + target_entry->size; + + /* If the literal range is at the end of the section, + do not add fill. */ + fill_extra_space = 0; + the_add_entry = + elf_xtensa_find_property_entry (target_sec_cache->ptbl, + target_sec_cache->pte_count, + entry_sec_offset); + if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE)) + fill_extra_space = the_add_entry->size; + + target_fa = find_fill_action (&target_relax_info->action_list, + target_sec, entry_sec_offset); + removed_diff = compute_removed_action_diff (target_fa, target_sec, + entry_sec_offset, 4, + fill_extra_space); + if (target_fa) + adjust_fill_action (target_fa, removed_diff); + else + text_action_add (&target_relax_info->action_list, + ta_fill, target_sec, entry_sec_offset, removed_diff); + } + + /* Mark that the literal will be moved to the new location. */ + add_removed_literal (&relax_info->removed_list, &rel->r_rel, target_loc); + + /* Remove the literal. */ + text_action_add (&relax_info->action_list, + ta_remove_literal, sec, rel->r_rel.target_offset, 4); + + /* If the section is 4-byte aligned, do not add fill. */ + if (sec->alignment_power > 2 && target_entry != src_entry) + { + int fill_extra_space; + bfd_vma entry_sec_offset; + + if (src_entry) + entry_sec_offset = src_entry->address - sec->vma + src_entry->size; + else + entry_sec_offset = rel->r_rel.target_offset+4; + + /* If the literal range is at the end of the section, + do not add fill. */ + fill_extra_space = 0; + the_add_entry = elf_xtensa_find_property_entry (prop_table, ptblsize, + entry_sec_offset); + if (the_add_entry && (the_add_entry->flags & XTENSA_PROP_UNREACHABLE)) + fill_extra_space = the_add_entry->size; + + fa = find_fill_action (&relax_info->action_list, sec, entry_sec_offset); + removed_diff = compute_removed_action_diff (fa, sec, entry_sec_offset, + -4, fill_extra_space); + if (fa) + adjust_fill_action (fa, removed_diff); + else + text_action_add (&relax_info->action_list, + ta_fill, sec, entry_sec_offset, removed_diff); + } + + return TRUE; +} + + +/* Second relaxation pass. */ + +/* Modify all of the relocations to point to the right spot, and if this + is a relaxable section, delete the unwanted literals and fix the + section size. */ + +bfd_boolean +relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info) +{ + Elf_Internal_Rela *internal_relocs; + xtensa_relax_info *relax_info; + bfd_byte *contents; + bfd_boolean ok = TRUE; + unsigned i; + bfd_boolean rv = FALSE; + bfd_boolean virtual_action; + bfd_size_type sec_size; + + sec_size = bfd_get_section_limit (abfd, sec); + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + + /* First translate any of the fixes that have been added already. */ + translate_section_fixes (sec); + + /* Handle property sections (e.g., literal tables) specially. */ + if (xtensa_is_property_section (sec)) + { + BFD_ASSERT (!relax_info->is_relaxable_literal_section); + return relax_property_section (abfd, sec, link_info); + } + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + if (!internal_relocs && !relax_info->action_list.head) + return TRUE; + + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec_size != 0) + { + ok = FALSE; + goto error_return; + } + + if (internal_relocs) + { + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel; + xtensa_relax_info *target_relax_info; + bfd_vma source_offset, old_source_offset; + r_reloc r_rel; + unsigned r_type; + asection *target_sec; + + /* Locally change the source address. + Translate the target to the new target address. + If it points to this section and has been removed, + NULLify it. + Write it back. */ + + irel = &internal_relocs[i]; + source_offset = irel->r_offset; + old_source_offset = source_offset; + + r_type = ELF32_R_TYPE (irel->r_info); + r_reloc_init (&r_rel, abfd, irel, contents, + bfd_get_section_limit (abfd, sec)); + + /* If this section could have changed then we may need to + change the relocation's offset. */ + + if (relax_info->is_relaxable_literal_section + || relax_info->is_relaxable_asm_section) + { + pin_internal_relocs (sec, internal_relocs); + + if (r_type != R_XTENSA_NONE + && find_removed_literal (&relax_info->removed_list, + irel->r_offset)) + { + /* Remove this relocation. */ + if (elf_hash_table (link_info)->dynamic_sections_created) + shrink_dynamic_reloc_sections (link_info, abfd, sec, irel); + irel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + irel->r_offset = offset_with_removed_text + (&relax_info->action_list, irel->r_offset); + continue; + } + + if (r_type == R_XTENSA_ASM_SIMPLIFY) + { + text_action *action = + find_insn_action (&relax_info->action_list, + irel->r_offset); + if (action && (action->action == ta_convert_longcall + || action->action == ta_remove_longcall)) + { + bfd_reloc_status_type retval; + char *error_message = NULL; + + retval = contract_asm_expansion (contents, sec_size, + irel, &error_message); + if (retval != bfd_reloc_ok) + { + (*link_info->callbacks->reloc_dangerous) + (link_info, error_message, abfd, sec, + irel->r_offset); + goto error_return; + } + /* Update the action so that the code that moves + the contents will do the right thing. */ + if (action->action == ta_remove_longcall) + action->action = ta_remove_insn; + else + action->action = ta_none; + /* Refresh the info in the r_rel. */ + r_reloc_init (&r_rel, abfd, irel, contents, sec_size); + r_type = ELF32_R_TYPE (irel->r_info); + } + } + + source_offset = offset_with_removed_text + (&relax_info->action_list, irel->r_offset); + irel->r_offset = source_offset; + } + + /* If the target section could have changed then + we may need to change the relocation's target offset. */ + + target_sec = r_reloc_get_section (&r_rel); + + /* For a reference to a discarded section from a DWARF section, + i.e., where action_discarded is PRETEND, the symbol will + eventually be modified to refer to the kept section (at least if + the kept and discarded sections are the same size). Anticipate + that here and adjust things accordingly. */ + if (! elf_xtensa_ignore_discarded_relocs (sec) + && elf_xtensa_action_discarded (sec) == PRETEND + && sec->sec_info_type != SEC_INFO_TYPE_STABS + && target_sec != NULL + && discarded_section (target_sec)) + { + /* It would be natural to call _bfd_elf_check_kept_section + here, but it's not exported from elflink.c. It's also a + fairly expensive check. Adjusting the relocations to the + discarded section is fairly harmless; it will only adjust + some addends and difference values. If it turns out that + _bfd_elf_check_kept_section fails later, it won't matter, + so just compare the section names to find the right group + member. */ + asection *kept = target_sec->kept_section; + if (kept != NULL) + { + if ((kept->flags & SEC_GROUP) != 0) + { + asection *first = elf_next_in_group (kept); + asection *s = first; + + kept = NULL; + while (s != NULL) + { + if (strcmp (s->name, target_sec->name) == 0) + { + kept = s; + break; + } + s = elf_next_in_group (s); + if (s == first) + break; + } + } + } + if (kept != NULL + && ((target_sec->rawsize != 0 + ? target_sec->rawsize : target_sec->size) + == (kept->rawsize != 0 ? kept->rawsize : kept->size))) + target_sec = kept; + } + + target_relax_info = get_xtensa_relax_info (target_sec); + if (target_relax_info + && (target_relax_info->is_relaxable_literal_section + || target_relax_info->is_relaxable_asm_section)) + { + r_reloc new_reloc; + target_sec = translate_reloc (&r_rel, &new_reloc, target_sec); + + if (r_type == R_XTENSA_DIFF8 + || r_type == R_XTENSA_DIFF16 + || r_type == R_XTENSA_DIFF32) + { + bfd_signed_vma diff_value = 0; + bfd_vma new_end_offset, diff_mask = 0; + + if (bfd_get_section_limit (abfd, sec) < old_source_offset) + { + (*link_info->callbacks->reloc_dangerous) + (link_info, _("invalid relocation address"), + abfd, sec, old_source_offset); + goto error_return; + } + + switch (r_type) + { + case R_XTENSA_DIFF8: + diff_value = + bfd_get_signed_8 (abfd, &contents[old_source_offset]); + break; + case R_XTENSA_DIFF16: + diff_value = + bfd_get_signed_16 (abfd, &contents[old_source_offset]); + break; + case R_XTENSA_DIFF32: + diff_value = + bfd_get_signed_32 (abfd, &contents[old_source_offset]); + break; + } + + new_end_offset = offset_with_removed_text + (&target_relax_info->action_list, + r_rel.target_offset + diff_value); + diff_value = new_end_offset - new_reloc.target_offset; + + switch (r_type) + { + case R_XTENSA_DIFF8: + diff_mask = 0x7f; + bfd_put_signed_8 (abfd, diff_value, + &contents[old_source_offset]); + break; + case R_XTENSA_DIFF16: + diff_mask = 0x7fff; + bfd_put_signed_16 (abfd, diff_value, + &contents[old_source_offset]); + break; + case R_XTENSA_DIFF32: + diff_mask = 0x7fffffff; + bfd_put_signed_32 (abfd, diff_value, + &contents[old_source_offset]); + break; + } + + /* Check for overflow. Sign bits must be all zeroes or all ones */ + if ((diff_value & ~diff_mask) != 0 && + (diff_value & ~diff_mask) != (-1 & ~diff_mask)) + { + (*link_info->callbacks->reloc_dangerous) + (link_info, _("overflow after relaxation"), + abfd, sec, old_source_offset); + goto error_return; + } + + pin_contents (sec, contents); + } + + /* If the relocation still references a section in the same + input file, modify the relocation directly instead of + adding a "fix" record. */ + if (target_sec->owner == abfd) + { + unsigned r_symndx = ELF32_R_SYM (new_reloc.rela.r_info); + irel->r_info = ELF32_R_INFO (r_symndx, r_type); + irel->r_addend = new_reloc.rela.r_addend; + pin_internal_relocs (sec, internal_relocs); + } + else + { + bfd_vma addend_displacement; + reloc_bfd_fix *fix; + + addend_displacement = + new_reloc.target_offset + new_reloc.virtual_offset; + fix = reloc_bfd_fix_init (sec, source_offset, r_type, + target_sec, + addend_displacement, TRUE); + add_fix (sec, fix); + } + } + } + } + + if ((relax_info->is_relaxable_literal_section + || relax_info->is_relaxable_asm_section) + && relax_info->action_list.head) + { + /* Walk through the planned actions and build up a table + of move, copy and fill records. Use the move, copy and + fill records to perform the actions once. */ + + int removed = 0; + bfd_size_type final_size, copy_size, orig_insn_size; + bfd_byte *scratch = NULL; + bfd_byte *dup_contents = NULL; + bfd_size_type orig_size = sec->size; + bfd_vma orig_dot = 0; + bfd_vma orig_dot_copied = 0; /* Byte copied already from + orig dot in physical memory. */ + bfd_vma orig_dot_vo = 0; /* Virtual offset from orig_dot. */ + bfd_vma dup_dot = 0; + + text_action *action = relax_info->action_list.head; + + final_size = sec->size; + for (action = relax_info->action_list.head; action; + action = action->next) + { + final_size -= action->removed_bytes; + } + + scratch = (bfd_byte *) bfd_zmalloc (final_size); + dup_contents = (bfd_byte *) bfd_zmalloc (final_size); + + /* The dot is the current fill location. */ +#if DEBUG + print_action_list (stderr, &relax_info->action_list); +#endif + + for (action = relax_info->action_list.head; action; + action = action->next) + { + virtual_action = FALSE; + if (action->offset > orig_dot) + { + orig_dot += orig_dot_copied; + orig_dot_copied = 0; + orig_dot_vo = 0; + /* Out of the virtual world. */ + } + + if (action->offset > orig_dot) + { + copy_size = action->offset - orig_dot; + memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size); + orig_dot += copy_size; + dup_dot += copy_size; + BFD_ASSERT (action->offset == orig_dot); + } + else if (action->offset < orig_dot) + { + if (action->action == ta_fill + && action->offset - action->removed_bytes == orig_dot) + { + /* This is OK because the fill only effects the dup_dot. */ + } + else if (action->action == ta_add_literal) + { + /* TBD. Might need to handle this. */ + } + } + if (action->offset == orig_dot) + { + if (action->virtual_offset > orig_dot_vo) + { + if (orig_dot_vo == 0) + { + /* Need to copy virtual_offset bytes. Probably four. */ + copy_size = action->virtual_offset - orig_dot_vo; + memmove (&dup_contents[dup_dot], + &contents[orig_dot], copy_size); + orig_dot_copied = copy_size; + dup_dot += copy_size; + } + virtual_action = TRUE; + } + else + BFD_ASSERT (action->virtual_offset <= orig_dot_vo); + } + switch (action->action) + { + case ta_remove_literal: + case ta_remove_insn: + BFD_ASSERT (action->removed_bytes >= 0); + orig_dot += action->removed_bytes; + break; + + case ta_narrow_insn: + orig_insn_size = 3; + copy_size = 2; + memmove (scratch, &contents[orig_dot], orig_insn_size); + BFD_ASSERT (action->removed_bytes == 1); + rv = narrow_instruction (scratch, final_size, 0); + BFD_ASSERT (rv); + memmove (&dup_contents[dup_dot], scratch, copy_size); + orig_dot += orig_insn_size; + dup_dot += copy_size; + break; + + case ta_fill: + if (action->removed_bytes >= 0) + orig_dot += action->removed_bytes; + else + { + /* Already zeroed in dup_contents. Just bump the + counters. */ + dup_dot += (-action->removed_bytes); + } + break; + + case ta_none: + BFD_ASSERT (action->removed_bytes == 0); + break; + + case ta_convert_longcall: + case ta_remove_longcall: + /* These will be removed or converted before we get here. */ + BFD_ASSERT (0); + break; + + case ta_widen_insn: + orig_insn_size = 2; + copy_size = 3; + memmove (scratch, &contents[orig_dot], orig_insn_size); + BFD_ASSERT (action->removed_bytes == -1); + rv = widen_instruction (scratch, final_size, 0); + BFD_ASSERT (rv); + memmove (&dup_contents[dup_dot], scratch, copy_size); + orig_dot += orig_insn_size; + dup_dot += copy_size; + break; + + case ta_add_literal: + orig_insn_size = 0; + copy_size = 4; + BFD_ASSERT (action->removed_bytes == -4); + /* TBD -- place the literal value here and insert + into the table. */ + memset (&dup_contents[dup_dot], 0, 4); + pin_internal_relocs (sec, internal_relocs); + pin_contents (sec, contents); + + if (!move_literal (abfd, link_info, sec, dup_dot, dup_contents, + relax_info, &internal_relocs, &action->value)) + goto error_return; + + if (virtual_action) + orig_dot_vo += copy_size; + + orig_dot += orig_insn_size; + dup_dot += copy_size; + break; + + default: + /* Not implemented yet. */ + BFD_ASSERT (0); + break; + } + + removed += action->removed_bytes; + BFD_ASSERT (dup_dot <= final_size); + BFD_ASSERT (orig_dot <= orig_size); + } + + orig_dot += orig_dot_copied; + orig_dot_copied = 0; + + if (orig_dot != orig_size) + { + copy_size = orig_size - orig_dot; + BFD_ASSERT (orig_size > orig_dot); + BFD_ASSERT (dup_dot + copy_size == final_size); + memmove (&dup_contents[dup_dot], &contents[orig_dot], copy_size); + orig_dot += copy_size; + dup_dot += copy_size; + } + BFD_ASSERT (orig_size == orig_dot); + BFD_ASSERT (final_size == dup_dot); + + /* Move the dup_contents back. */ + if (final_size > orig_size) + { + /* Contents need to be reallocated. Swap the dup_contents into + contents. */ + sec->contents = dup_contents; + free (contents); + contents = dup_contents; + pin_contents (sec, contents); + } + else + { + BFD_ASSERT (final_size <= orig_size); + memset (contents, 0, orig_size); + memcpy (contents, dup_contents, final_size); + free (dup_contents); + } + free (scratch); + pin_contents (sec, contents); + + if (sec->rawsize == 0) + sec->rawsize = sec->size; + sec->size = final_size; + } + + error_return: + release_internal_relocs (sec, internal_relocs); + release_contents (sec, contents); + return ok; +} + + +static bfd_boolean +translate_section_fixes (asection *sec) +{ + xtensa_relax_info *relax_info; + reloc_bfd_fix *r; + + relax_info = get_xtensa_relax_info (sec); + if (!relax_info) + return TRUE; + + for (r = relax_info->fix_list; r != NULL; r = r->next) + if (!translate_reloc_bfd_fix (r)) + return FALSE; + + return TRUE; +} + + +/* Translate a fix given the mapping in the relax info for the target + section. If it has already been translated, no work is required. */ + +static bfd_boolean +translate_reloc_bfd_fix (reloc_bfd_fix *fix) +{ + reloc_bfd_fix new_fix; + asection *sec; + xtensa_relax_info *relax_info; + removed_literal *removed; + bfd_vma new_offset, target_offset; + + if (fix->translated) + return TRUE; + + sec = fix->target_sec; + target_offset = fix->target_offset; + + relax_info = get_xtensa_relax_info (sec); + if (!relax_info) + { + fix->translated = TRUE; + return TRUE; + } + + new_fix = *fix; + + /* The fix does not need to be translated if the section cannot change. */ + if (!relax_info->is_relaxable_literal_section + && !relax_info->is_relaxable_asm_section) + { + fix->translated = TRUE; + return TRUE; + } + + /* If the literal has been moved and this relocation was on an + opcode, then the relocation should move to the new literal + location. Otherwise, the relocation should move within the + section. */ + + removed = FALSE; + if (is_operand_relocation (fix->src_type)) + { + /* Check if the original relocation is against a literal being + removed. */ + removed = find_removed_literal (&relax_info->removed_list, + target_offset); + } + + if (removed) + { + asection *new_sec; + + /* The fact that there is still a relocation to this literal indicates + that the literal is being coalesced, not simply removed. */ + BFD_ASSERT (removed->to.abfd != NULL); + + /* This was moved to some other address (possibly another section). */ + new_sec = r_reloc_get_section (&removed->to); + if (new_sec != sec) + { + sec = new_sec; + relax_info = get_xtensa_relax_info (sec); + if (!relax_info || + (!relax_info->is_relaxable_literal_section + && !relax_info->is_relaxable_asm_section)) + { + target_offset = removed->to.target_offset; + new_fix.target_sec = new_sec; + new_fix.target_offset = target_offset; + new_fix.translated = TRUE; + *fix = new_fix; + return TRUE; + } + } + target_offset = removed->to.target_offset; + new_fix.target_sec = new_sec; + } + + /* The target address may have been moved within its section. */ + new_offset = offset_with_removed_text (&relax_info->action_list, + target_offset); + + new_fix.target_offset = new_offset; + new_fix.target_offset = new_offset; + new_fix.translated = TRUE; + *fix = new_fix; + return TRUE; +} + + +/* Fix up a relocation to take account of removed literals. */ + +static asection * +translate_reloc (const r_reloc *orig_rel, r_reloc *new_rel, asection *sec) +{ + xtensa_relax_info *relax_info; + removed_literal *removed; + bfd_vma target_offset, base_offset; + text_action *act; + + *new_rel = *orig_rel; + + if (!r_reloc_is_defined (orig_rel)) + return sec ; + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info && (relax_info->is_relaxable_literal_section + || relax_info->is_relaxable_asm_section)); + + target_offset = orig_rel->target_offset; + + removed = FALSE; + if (is_operand_relocation (ELF32_R_TYPE (orig_rel->rela.r_info))) + { + /* Check if the original relocation is against a literal being + removed. */ + removed = find_removed_literal (&relax_info->removed_list, + target_offset); + } + if (removed && removed->to.abfd) + { + asection *new_sec; + + /* The fact that there is still a relocation to this literal indicates + that the literal is being coalesced, not simply removed. */ + BFD_ASSERT (removed->to.abfd != NULL); + + /* This was moved to some other address + (possibly in another section). */ + *new_rel = removed->to; + new_sec = r_reloc_get_section (new_rel); + if (new_sec != sec) + { + sec = new_sec; + relax_info = get_xtensa_relax_info (sec); + if (!relax_info + || (!relax_info->is_relaxable_literal_section + && !relax_info->is_relaxable_asm_section)) + return sec; + } + target_offset = new_rel->target_offset; + } + + /* Find the base offset of the reloc symbol, excluding any addend from the + reloc or from the section contents (for a partial_inplace reloc). Then + find the adjusted values of the offsets due to relaxation. The base + offset is needed to determine the change to the reloc's addend; the reloc + addend should not be adjusted due to relaxations located before the base + offset. */ + + base_offset = r_reloc_get_target_offset (new_rel) - new_rel->rela.r_addend; + act = relax_info->action_list.head; + if (base_offset <= target_offset) + { + int base_removed = removed_by_actions (&act, base_offset, FALSE); + int addend_removed = removed_by_actions (&act, target_offset, FALSE); + new_rel->target_offset = target_offset - base_removed - addend_removed; + new_rel->rela.r_addend -= addend_removed; + } + else + { + /* Handle a negative addend. The base offset comes first. */ + int tgt_removed = removed_by_actions (&act, target_offset, FALSE); + int addend_removed = removed_by_actions (&act, base_offset, FALSE); + new_rel->target_offset = target_offset - tgt_removed; + new_rel->rela.r_addend += addend_removed; + } + + return sec; +} + + +/* For dynamic links, there may be a dynamic relocation for each + literal. The number of dynamic relocations must be computed in + size_dynamic_sections, which occurs before relaxation. When a + literal is removed, this function checks if there is a corresponding + dynamic relocation and shrinks the size of the appropriate dynamic + relocation section accordingly. At this point, the contents of the + dynamic relocation sections have not yet been filled in, so there's + nothing else that needs to be done. */ + +static void +shrink_dynamic_reloc_sections (struct bfd_link_info *info, + bfd *abfd, + asection *input_section, + Elf_Internal_Rela *rel) +{ + struct elf_xtensa_link_hash_table *htab; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + unsigned long r_symndx; + int r_type; + struct elf_link_hash_entry *h; + bfd_boolean dynamic_symbol; + + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + r_type = ELF32_R_TYPE (rel->r_info); + r_symndx = ELF32_R_SYM (rel->r_info); + + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + dynamic_symbol = elf_xtensa_dynamic_symbol_p (h, info); + + if ((r_type == R_XTENSA_32 || r_type == R_XTENSA_PLT) + && (input_section->flags & SEC_ALLOC) != 0 + && (dynamic_symbol || info->shared)) + { + asection *srel; + bfd_boolean is_plt = FALSE; + + if (dynamic_symbol && r_type == R_XTENSA_PLT) + { + srel = htab->srelplt; + is_plt = TRUE; + } + else + srel = htab->srelgot; + + /* Reduce size of the .rela.* section by one reloc. */ + BFD_ASSERT (srel != NULL); + BFD_ASSERT (srel->size >= sizeof (Elf32_External_Rela)); + srel->size -= sizeof (Elf32_External_Rela); + + if (is_plt) + { + asection *splt, *sgotplt, *srelgot; + int reloc_index, chunk; + + /* Find the PLT reloc index of the entry being removed. This + is computed from the size of ".rela.plt". It is needed to + figure out which PLT chunk to resize. Usually "last index + = size - 1" since the index starts at zero, but in this + context, the size has just been decremented so there's no + need to subtract one. */ + reloc_index = srel->size / sizeof (Elf32_External_Rela); + + chunk = reloc_index / PLT_ENTRIES_PER_CHUNK; + splt = elf_xtensa_get_plt_section (info, chunk); + sgotplt = elf_xtensa_get_gotplt_section (info, chunk); + BFD_ASSERT (splt != NULL && sgotplt != NULL); + + /* Check if an entire PLT chunk has just been eliminated. */ + if (reloc_index % PLT_ENTRIES_PER_CHUNK == 0) + { + /* The two magic GOT entries for that chunk can go away. */ + srelgot = htab->srelgot; + BFD_ASSERT (srelgot != NULL); + srelgot->reloc_count -= 2; + srelgot->size -= 2 * sizeof (Elf32_External_Rela); + sgotplt->size -= 8; + + /* There should be only one entry left (and it will be + removed below). */ + BFD_ASSERT (sgotplt->size == 4); + BFD_ASSERT (splt->size == PLT_ENTRY_SIZE); + } + + BFD_ASSERT (sgotplt->size >= 4); + BFD_ASSERT (splt->size >= PLT_ENTRY_SIZE); + + sgotplt->size -= 4; + splt->size -= PLT_ENTRY_SIZE; + } + } +} + + +/* Take an r_rel and move it to another section. This usually + requires extending the interal_relocation array and pinning it. If + the original r_rel is from the same BFD, we can complete this here. + Otherwise, we add a fix record to let the final link fix the + appropriate address. Contents and internal relocations for the + section must be pinned after calling this routine. */ + +static bfd_boolean +move_literal (bfd *abfd, + struct bfd_link_info *link_info, + asection *sec, + bfd_vma offset, + bfd_byte *contents, + xtensa_relax_info *relax_info, + Elf_Internal_Rela **internal_relocs_p, + const literal_value *lit) +{ + Elf_Internal_Rela *new_relocs = NULL; + size_t new_relocs_count = 0; + Elf_Internal_Rela this_rela; + const r_reloc *r_rel; + + r_rel = &lit->r_rel; + BFD_ASSERT (elf_section_data (sec)->relocs == *internal_relocs_p); + + if (r_reloc_is_const (r_rel)) + bfd_put_32 (abfd, lit->value, contents + offset); + else + { + int r_type; + unsigned i; + reloc_bfd_fix *fix; + unsigned insert_at; + + r_type = ELF32_R_TYPE (r_rel->rela.r_info); + + /* This is the difficult case. We have to create a fix up. */ + this_rela.r_offset = offset; + this_rela.r_info = ELF32_R_INFO (0, r_type); + this_rela.r_addend = + r_rel->target_offset - r_reloc_get_target_offset (r_rel); + bfd_put_32 (abfd, lit->value, contents + offset); + + /* Currently, we cannot move relocations during a relocatable link. */ + BFD_ASSERT (!link_info->relocatable); + fix = reloc_bfd_fix_init (sec, offset, r_type, + r_reloc_get_section (r_rel), + r_rel->target_offset + r_rel->virtual_offset, + FALSE); + /* We also need to mark that relocations are needed here. */ + sec->flags |= SEC_RELOC; + + translate_reloc_bfd_fix (fix); + /* This fix has not yet been translated. */ + add_fix (sec, fix); + + /* Add the relocation. If we have already allocated our own + space for the relocations and we have room for more, then use + it. Otherwise, allocate new space and move the literals. */ + insert_at = sec->reloc_count; + for (i = 0; i < sec->reloc_count; ++i) + { + if (this_rela.r_offset < (*internal_relocs_p)[i].r_offset) + { + insert_at = i; + break; + } + } + + if (*internal_relocs_p != relax_info->allocated_relocs + || sec->reloc_count + 1 > relax_info->allocated_relocs_count) + { + BFD_ASSERT (relax_info->allocated_relocs == NULL + || sec->reloc_count == relax_info->relocs_count); + + if (relax_info->allocated_relocs_count == 0) + new_relocs_count = (sec->reloc_count + 2) * 2; + else + new_relocs_count = (relax_info->allocated_relocs_count + 2) * 2; + + new_relocs = (Elf_Internal_Rela *) + bfd_zmalloc (sizeof (Elf_Internal_Rela) * (new_relocs_count)); + if (!new_relocs) + return FALSE; + + /* We could handle this more quickly by finding the split point. */ + if (insert_at != 0) + memcpy (new_relocs, *internal_relocs_p, + insert_at * sizeof (Elf_Internal_Rela)); + + new_relocs[insert_at] = this_rela; + + if (insert_at != sec->reloc_count) + memcpy (new_relocs + insert_at + 1, + (*internal_relocs_p) + insert_at, + (sec->reloc_count - insert_at) + * sizeof (Elf_Internal_Rela)); + + if (*internal_relocs_p != relax_info->allocated_relocs) + { + /* The first time we re-allocate, we can only free the + old relocs if they were allocated with bfd_malloc. + This is not true when keep_memory is in effect. */ + if (!link_info->keep_memory) + free (*internal_relocs_p); + } + else + free (*internal_relocs_p); + relax_info->allocated_relocs = new_relocs; + relax_info->allocated_relocs_count = new_relocs_count; + elf_section_data (sec)->relocs = new_relocs; + sec->reloc_count++; + relax_info->relocs_count = sec->reloc_count; + *internal_relocs_p = new_relocs; + } + else + { + if (insert_at != sec->reloc_count) + { + unsigned idx; + for (idx = sec->reloc_count; idx > insert_at; idx--) + (*internal_relocs_p)[idx] = (*internal_relocs_p)[idx-1]; + } + (*internal_relocs_p)[insert_at] = this_rela; + sec->reloc_count++; + if (relax_info->allocated_relocs) + relax_info->relocs_count = sec->reloc_count; + } + } + return TRUE; +} + + +/* This is similar to relax_section except that when a target is moved, + we shift addresses up. We also need to modify the size. This + algorithm does NOT allow for relocations into the middle of the + property sections. */ + +static bfd_boolean +relax_property_section (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info) +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + unsigned i; + bfd_boolean ok = TRUE; + bfd_boolean is_full_prop_section; + size_t last_zfill_target_offset = 0; + asection *last_zfill_target_sec = NULL; + bfd_size_type sec_size; + bfd_size_type entry_size; + + sec_size = bfd_get_section_limit (abfd, sec); + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec_size != 0) + { + ok = FALSE; + goto error_return; + } + + is_full_prop_section = xtensa_is_proptable_section (sec); + if (is_full_prop_section) + entry_size = 12; + else + entry_size = 8; + + if (internal_relocs) + { + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel; + xtensa_relax_info *target_relax_info; + unsigned r_type; + asection *target_sec; + literal_value val; + bfd_byte *size_p, *flags_p; + + /* Locally change the source address. + Translate the target to the new target address. + If it points to this section and has been removed, MOVE IT. + Also, don't forget to modify the associated SIZE at + (offset + 4). */ + + irel = &internal_relocs[i]; + r_type = ELF32_R_TYPE (irel->r_info); + if (r_type == R_XTENSA_NONE) + continue; + + /* Find the literal value. */ + r_reloc_init (&val.r_rel, abfd, irel, contents, sec_size); + size_p = &contents[irel->r_offset + 4]; + flags_p = NULL; + if (is_full_prop_section) + flags_p = &contents[irel->r_offset + 8]; + BFD_ASSERT (irel->r_offset + entry_size <= sec_size); + + target_sec = r_reloc_get_section (&val.r_rel); + target_relax_info = get_xtensa_relax_info (target_sec); + + if (target_relax_info + && (target_relax_info->is_relaxable_literal_section + || target_relax_info->is_relaxable_asm_section )) + { + /* Translate the relocation's destination. */ + bfd_vma old_offset = val.r_rel.target_offset; + bfd_vma new_offset; + long old_size, new_size; + text_action *act = target_relax_info->action_list.head; + new_offset = old_offset - + removed_by_actions (&act, old_offset, FALSE); + + /* Assert that we are not out of bounds. */ + old_size = bfd_get_32 (abfd, size_p); + new_size = old_size; + + if (old_size == 0) + { + /* Only the first zero-sized unreachable entry is + allowed to expand. In this case the new offset + should be the offset before the fill and the new + size is the expansion size. For other zero-sized + entries the resulting size should be zero with an + offset before or after the fill address depending + on whether the expanding unreachable entry + preceeds it. */ + if (last_zfill_target_sec == 0 + || last_zfill_target_sec != target_sec + || last_zfill_target_offset != old_offset) + { + bfd_vma new_end_offset = new_offset; + + /* Recompute the new_offset, but this time don't + include any fill inserted by relaxation. */ + act = target_relax_info->action_list.head; + new_offset = old_offset - + removed_by_actions (&act, old_offset, TRUE); + + /* If it is not unreachable and we have not yet + seen an unreachable at this address, place it + before the fill address. */ + if (flags_p && (bfd_get_32 (abfd, flags_p) + & XTENSA_PROP_UNREACHABLE) != 0) + { + new_size = new_end_offset - new_offset; + + last_zfill_target_sec = target_sec; + last_zfill_target_offset = old_offset; + } + } + } + else + new_size -= + removed_by_actions (&act, old_offset + old_size, TRUE); + + if (new_size != old_size) + { + bfd_put_32 (abfd, new_size, size_p); + pin_contents (sec, contents); + } + + if (new_offset != old_offset) + { + bfd_vma diff = new_offset - old_offset; + irel->r_addend += diff; + pin_internal_relocs (sec, internal_relocs); + } + } + } + } + + /* Combine adjacent property table entries. This is also done in + finish_dynamic_sections() but at that point it's too late to + reclaim the space in the output section, so we do this twice. */ + + if (internal_relocs && (!link_info->relocatable + || xtensa_is_littable_section (sec))) + { + Elf_Internal_Rela *last_irel = NULL; + Elf_Internal_Rela *irel, *next_rel, *rel_end; + int removed_bytes = 0; + bfd_vma offset; + flagword predef_flags; + + predef_flags = xtensa_get_property_predef_flags (sec); + + /* Walk over memory and relocations at the same time. + This REQUIRES that the internal_relocs be sorted by offset. */ + qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela), + internal_reloc_compare); + + pin_internal_relocs (sec, internal_relocs); + pin_contents (sec, contents); + + next_rel = internal_relocs; + rel_end = internal_relocs + sec->reloc_count; + + BFD_ASSERT (sec->size % entry_size == 0); + + for (offset = 0; offset < sec->size; offset += entry_size) + { + Elf_Internal_Rela *offset_rel, *extra_rel; + bfd_vma bytes_to_remove, size, actual_offset; + bfd_boolean remove_this_rel; + flagword flags; + + /* Find the first relocation for the entry at the current offset. + Adjust the offsets of any extra relocations for the previous + entry. */ + offset_rel = NULL; + if (next_rel) + { + for (irel = next_rel; irel < rel_end; irel++) + { + if ((irel->r_offset == offset + && ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE) + || irel->r_offset > offset) + { + offset_rel = irel; + break; + } + irel->r_offset -= removed_bytes; + } + } + + /* Find the next relocation (if there are any left). */ + extra_rel = NULL; + if (offset_rel) + { + for (irel = offset_rel + 1; irel < rel_end; irel++) + { + if (ELF32_R_TYPE (irel->r_info) != R_XTENSA_NONE) + { + extra_rel = irel; + break; + } + } + } + + /* Check if there are relocations on the current entry. There + should usually be a relocation on the offset field. If there + are relocations on the size or flags, then we can't optimize + this entry. Also, find the next relocation to examine on the + next iteration. */ + if (offset_rel) + { + if (offset_rel->r_offset >= offset + entry_size) + { + next_rel = offset_rel; + /* There are no relocations on the current entry, but we + might still be able to remove it if the size is zero. */ + offset_rel = NULL; + } + else if (offset_rel->r_offset > offset + || (extra_rel + && extra_rel->r_offset < offset + entry_size)) + { + /* There is a relocation on the size or flags, so we can't + do anything with this entry. Continue with the next. */ + next_rel = offset_rel; + continue; + } + else + { + BFD_ASSERT (offset_rel->r_offset == offset); + offset_rel->r_offset -= removed_bytes; + next_rel = offset_rel + 1; + } + } + else + next_rel = NULL; + + remove_this_rel = FALSE; + bytes_to_remove = 0; + actual_offset = offset - removed_bytes; + size = bfd_get_32 (abfd, &contents[actual_offset + 4]); + + if (is_full_prop_section) + flags = bfd_get_32 (abfd, &contents[actual_offset + 8]); + else + flags = predef_flags; + + if (size == 0 + && (flags & XTENSA_PROP_ALIGN) == 0 + && (flags & XTENSA_PROP_UNREACHABLE) == 0) + { + /* Always remove entries with zero size and no alignment. */ + bytes_to_remove = entry_size; + if (offset_rel) + remove_this_rel = TRUE; + } + else if (offset_rel + && ELF32_R_TYPE (offset_rel->r_info) == R_XTENSA_32) + { + if (last_irel) + { + flagword old_flags; + bfd_vma old_size = + bfd_get_32 (abfd, &contents[last_irel->r_offset + 4]); + bfd_vma old_address = + (last_irel->r_addend + + bfd_get_32 (abfd, &contents[last_irel->r_offset])); + bfd_vma new_address = + (offset_rel->r_addend + + bfd_get_32 (abfd, &contents[actual_offset])); + if (is_full_prop_section) + old_flags = bfd_get_32 + (abfd, &contents[last_irel->r_offset + 8]); + else + old_flags = predef_flags; + + if ((ELF32_R_SYM (offset_rel->r_info) + == ELF32_R_SYM (last_irel->r_info)) + && old_address + old_size == new_address + && old_flags == flags + && (old_flags & XTENSA_PROP_INSN_BRANCH_TARGET) == 0 + && (old_flags & XTENSA_PROP_INSN_LOOP_TARGET) == 0) + { + /* Fix the old size. */ + bfd_put_32 (abfd, old_size + size, + &contents[last_irel->r_offset + 4]); + bytes_to_remove = entry_size; + remove_this_rel = TRUE; + } + else + last_irel = offset_rel; + } + else + last_irel = offset_rel; + } + + if (remove_this_rel) + { + offset_rel->r_info = ELF32_R_INFO (0, R_XTENSA_NONE); + offset_rel->r_offset = 0; + } + + if (bytes_to_remove != 0) + { + removed_bytes += bytes_to_remove; + if (offset + bytes_to_remove < sec->size) + memmove (&contents[actual_offset], + &contents[actual_offset + bytes_to_remove], + sec->size - offset - bytes_to_remove); + } + } + + if (removed_bytes) + { + /* Fix up any extra relocations on the last entry. */ + for (irel = next_rel; irel < rel_end; irel++) + irel->r_offset -= removed_bytes; + + /* Clear the removed bytes. */ + memset (&contents[sec->size - removed_bytes], 0, removed_bytes); + + if (sec->rawsize == 0) + sec->rawsize = sec->size; + sec->size -= removed_bytes; + + if (xtensa_is_littable_section (sec)) + { + asection *sgotloc = elf_xtensa_hash_table (link_info)->sgotloc; + if (sgotloc) + sgotloc->size -= removed_bytes; + } + } + } + + error_return: + release_internal_relocs (sec, internal_relocs); + release_contents (sec, contents); + return ok; +} + + +/* Third relaxation pass. */ + +/* Change symbol values to account for removed literals. */ + +bfd_boolean +relax_section_symbols (bfd *abfd, asection *sec) +{ + xtensa_relax_info *relax_info; + unsigned int sec_shndx; + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Sym *isymbuf; + unsigned i, num_syms, num_locals; + + relax_info = get_xtensa_relax_info (sec); + BFD_ASSERT (relax_info); + + if (!relax_info->is_relaxable_literal_section + && !relax_info->is_relaxable_asm_section) + return TRUE; + + sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + isymbuf = retrieve_local_syms (abfd); + + num_syms = symtab_hdr->sh_size / sizeof (Elf32_External_Sym); + num_locals = symtab_hdr->sh_info; + + /* Adjust the local symbols defined in this section. */ + for (i = 0; i < num_locals; i++) + { + Elf_Internal_Sym *isym = &isymbuf[i]; + + if (isym->st_shndx == sec_shndx) + { + text_action *act = relax_info->action_list.head; + bfd_vma orig_addr = isym->st_value; + + isym->st_value -= removed_by_actions (&act, orig_addr, FALSE); + + if (ELF32_ST_TYPE (isym->st_info) == STT_FUNC) + isym->st_size -= + removed_by_actions (&act, orig_addr + isym->st_size, FALSE); + } + } + + /* Now adjust the global symbols defined in this section. */ + for (i = 0; i < (num_syms - num_locals); i++) + { + struct elf_link_hash_entry *sym_hash; + + sym_hash = elf_sym_hashes (abfd)[i]; + + if (sym_hash->root.type == bfd_link_hash_warning) + sym_hash = (struct elf_link_hash_entry *) sym_hash->root.u.i.link; + + if ((sym_hash->root.type == bfd_link_hash_defined + || sym_hash->root.type == bfd_link_hash_defweak) + && sym_hash->root.u.def.section == sec) + { + text_action *act = relax_info->action_list.head; + bfd_vma orig_addr = sym_hash->root.u.def.value; + + sym_hash->root.u.def.value -= + removed_by_actions (&act, orig_addr, FALSE); + + if (sym_hash->type == STT_FUNC) + sym_hash->size -= + removed_by_actions (&act, orig_addr + sym_hash->size, FALSE); + } + } + + return TRUE; +} + + +/* "Fix" handling functions, called while performing relocations. */ + +static bfd_boolean +do_fix_for_relocatable_link (Elf_Internal_Rela *rel, + bfd *input_bfd, + asection *input_section, + bfd_byte *contents) +{ + r_reloc r_rel; + asection *sec, *old_sec; + bfd_vma old_offset; + int r_type = ELF32_R_TYPE (rel->r_info); + reloc_bfd_fix *fix; + + if (r_type == R_XTENSA_NONE) + return TRUE; + + fix = get_bfd_fix (input_section, rel->r_offset, r_type); + if (!fix) + return TRUE; + + r_reloc_init (&r_rel, input_bfd, rel, contents, + bfd_get_section_limit (input_bfd, input_section)); + old_sec = r_reloc_get_section (&r_rel); + old_offset = r_rel.target_offset; + + if (!old_sec || !r_reloc_is_defined (&r_rel)) + { + if (r_type != R_XTENSA_ASM_EXPAND) + { + (*_bfd_error_handler) + (_("%B(%A+0x%lx): unexpected fix for %s relocation"), + input_bfd, input_section, rel->r_offset, + elf_howto_table[r_type].name); + return FALSE; + } + /* Leave it be. Resolution will happen in a later stage. */ + } + else + { + sec = fix->target_sec; + rel->r_addend += ((sec->output_offset + fix->target_offset) + - (old_sec->output_offset + old_offset)); + } + return TRUE; +} + + +static void +do_fix_for_final_link (Elf_Internal_Rela *rel, + bfd *input_bfd, + asection *input_section, + bfd_byte *contents, + bfd_vma *relocationp) +{ + asection *sec; + int r_type = ELF32_R_TYPE (rel->r_info); + reloc_bfd_fix *fix; + bfd_vma fixup_diff; + + if (r_type == R_XTENSA_NONE) + return; + + fix = get_bfd_fix (input_section, rel->r_offset, r_type); + if (!fix) + return; + + sec = fix->target_sec; + + fixup_diff = rel->r_addend; + if (elf_howto_table[fix->src_type].partial_inplace) + { + bfd_vma inplace_val; + BFD_ASSERT (fix->src_offset + < bfd_get_section_limit (input_bfd, input_section)); + inplace_val = bfd_get_32 (input_bfd, &contents[fix->src_offset]); + fixup_diff += inplace_val; + } + + *relocationp = (sec->output_section->vma + + sec->output_offset + + fix->target_offset - fixup_diff); +} + + +/* Miscellaneous utility functions.... */ + +static asection * +elf_xtensa_get_plt_section (struct bfd_link_info *info, int chunk) +{ + struct elf_xtensa_link_hash_table *htab; + bfd *dynobj; + char plt_name[10]; + + if (chunk == 0) + { + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return NULL; + + return htab->splt; + } + + dynobj = elf_hash_table (info)->dynobj; + sprintf (plt_name, ".plt.%u", chunk); + return bfd_get_linker_section (dynobj, plt_name); +} + + +static asection * +elf_xtensa_get_gotplt_section (struct bfd_link_info *info, int chunk) +{ + struct elf_xtensa_link_hash_table *htab; + bfd *dynobj; + char got_name[14]; + + if (chunk == 0) + { + htab = elf_xtensa_hash_table (info); + if (htab == NULL) + return NULL; + return htab->sgotplt; + } + + dynobj = elf_hash_table (info)->dynobj; + sprintf (got_name, ".got.plt.%u", chunk); + return bfd_get_linker_section (dynobj, got_name); +} + + +/* Get the input section for a given symbol index. + If the symbol is: + . a section symbol, return the section; + . a common symbol, return the common section; + . an undefined symbol, return the undefined section; + . an indirect symbol, follow the links; + . an absolute value, return the absolute section. */ + +static asection * +get_elf_r_symndx_section (bfd *abfd, unsigned long r_symndx) +{ + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + asection *target_sec = NULL; + if (r_symndx < symtab_hdr->sh_info) + { + Elf_Internal_Sym *isymbuf; + unsigned int section_index; + + isymbuf = retrieve_local_syms (abfd); + section_index = isymbuf[r_symndx].st_shndx; + + if (section_index == SHN_UNDEF) + target_sec = bfd_und_section_ptr; + else if (section_index == SHN_ABS) + target_sec = bfd_abs_section_ptr; + else if (section_index == SHN_COMMON) + target_sec = bfd_com_section_ptr; + else + target_sec = bfd_section_from_elf_index (abfd, section_index); + } + else + { + unsigned long indx = r_symndx - symtab_hdr->sh_info; + struct elf_link_hash_entry *h = elf_sym_hashes (abfd)[indx]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + switch (h->root.type) + { + case bfd_link_hash_defined: + case bfd_link_hash_defweak: + target_sec = h->root.u.def.section; + break; + case bfd_link_hash_common: + target_sec = bfd_com_section_ptr; + break; + case bfd_link_hash_undefined: + case bfd_link_hash_undefweak: + target_sec = bfd_und_section_ptr; + break; + default: /* New indirect warning. */ + target_sec = bfd_und_section_ptr; + break; + } + } + return target_sec; +} + + +static struct elf_link_hash_entry * +get_elf_r_symndx_hash_entry (bfd *abfd, unsigned long r_symndx) +{ + unsigned long indx; + struct elf_link_hash_entry *h; + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + + if (r_symndx < symtab_hdr->sh_info) + return NULL; + + indx = r_symndx - symtab_hdr->sh_info; + h = elf_sym_hashes (abfd)[indx]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + return h; +} + + +/* Get the section-relative offset for a symbol number. */ + +static bfd_vma +get_elf_r_symndx_offset (bfd *abfd, unsigned long r_symndx) +{ + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + bfd_vma offset = 0; + + if (r_symndx < symtab_hdr->sh_info) + { + Elf_Internal_Sym *isymbuf; + isymbuf = retrieve_local_syms (abfd); + offset = isymbuf[r_symndx].st_value; + } + else + { + unsigned long indx = r_symndx - symtab_hdr->sh_info; + struct elf_link_hash_entry *h = + elf_sym_hashes (abfd)[indx]; + + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + offset = h->root.u.def.value; + } + return offset; +} + + +static bfd_boolean +is_reloc_sym_weak (bfd *abfd, Elf_Internal_Rela *rel) +{ + unsigned long r_symndx = ELF32_R_SYM (rel->r_info); + struct elf_link_hash_entry *h; + + h = get_elf_r_symndx_hash_entry (abfd, r_symndx); + if (h && h->root.type == bfd_link_hash_defweak) + return TRUE; + return FALSE; +} + + +static bfd_boolean +pcrel_reloc_fits (xtensa_opcode opc, + int opnd, + bfd_vma self_address, + bfd_vma dest_address) +{ + xtensa_isa isa = xtensa_default_isa; + uint32 valp = dest_address; + if (xtensa_operand_do_reloc (isa, opc, opnd, &valp, self_address) + || xtensa_operand_encode (isa, opc, opnd, &valp)) + return FALSE; + return TRUE; +} + + +static bfd_boolean +xtensa_is_property_section (asection *sec) +{ + if (xtensa_is_insntable_section (sec) + || xtensa_is_littable_section (sec) + || xtensa_is_proptable_section (sec)) + return TRUE; + + return FALSE; +} + + +static bfd_boolean +xtensa_is_insntable_section (asection *sec) +{ + if (CONST_STRNEQ (sec->name, XTENSA_INSN_SEC_NAME) + || CONST_STRNEQ (sec->name, ".gnu.linkonce.x.")) + return TRUE; + + return FALSE; +} + + +static bfd_boolean +xtensa_is_littable_section (asection *sec) +{ + if (CONST_STRNEQ (sec->name, XTENSA_LIT_SEC_NAME) + || CONST_STRNEQ (sec->name, ".gnu.linkonce.p.")) + return TRUE; + + return FALSE; +} + + +static bfd_boolean +xtensa_is_proptable_section (asection *sec) +{ + if (CONST_STRNEQ (sec->name, XTENSA_PROP_SEC_NAME) + || CONST_STRNEQ (sec->name, ".gnu.linkonce.prop.")) + return TRUE; + + return FALSE; +} + + +static int +internal_reloc_compare (const void *ap, const void *bp) +{ + const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap; + const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp; + + if (a->r_offset != b->r_offset) + return (a->r_offset - b->r_offset); + + /* We don't need to sort on these criteria for correctness, + but enforcing a more strict ordering prevents unstable qsort + from behaving differently with different implementations. + Without the code below we get correct but different results + on Solaris 2.7 and 2.8. We would like to always produce the + same results no matter the host. */ + + if (a->r_info != b->r_info) + return (a->r_info - b->r_info); + + return (a->r_addend - b->r_addend); +} + + +static int +internal_reloc_matches (const void *ap, const void *bp) +{ + const Elf_Internal_Rela *a = (const Elf_Internal_Rela *) ap; + const Elf_Internal_Rela *b = (const Elf_Internal_Rela *) bp; + + /* Check if one entry overlaps with the other; this shouldn't happen + except when searching for a match. */ + return (a->r_offset - b->r_offset); +} + + +/* Predicate function used to look up a section in a particular group. */ + +static bfd_boolean +match_section_group (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *inf) +{ + const char *gname = inf; + const char *group_name = elf_group_name (sec); + + return (group_name == gname + || (group_name != NULL + && gname != NULL + && strcmp (group_name, gname) == 0)); +} + + +static int linkonce_len = sizeof (".gnu.linkonce.") - 1; + +static char * +xtensa_property_section_name (asection *sec, const char *base_name) +{ + const char *suffix, *group_name; + char *prop_sec_name; + + group_name = elf_group_name (sec); + if (group_name) + { + suffix = strrchr (sec->name, '.'); + if (suffix == sec->name) + suffix = 0; + prop_sec_name = (char *) bfd_malloc (strlen (base_name) + 1 + + (suffix ? strlen (suffix) : 0)); + strcpy (prop_sec_name, base_name); + if (suffix) + strcat (prop_sec_name, suffix); + } + else if (strncmp (sec->name, ".gnu.linkonce.", linkonce_len) == 0) + { + char *linkonce_kind = 0; + + if (strcmp (base_name, XTENSA_INSN_SEC_NAME) == 0) + linkonce_kind = "x."; + else if (strcmp (base_name, XTENSA_LIT_SEC_NAME) == 0) + linkonce_kind = "p."; + else if (strcmp (base_name, XTENSA_PROP_SEC_NAME) == 0) + linkonce_kind = "prop."; + else + abort (); + + prop_sec_name = (char *) bfd_malloc (strlen (sec->name) + + strlen (linkonce_kind) + 1); + memcpy (prop_sec_name, ".gnu.linkonce.", linkonce_len); + strcpy (prop_sec_name + linkonce_len, linkonce_kind); + + suffix = sec->name + linkonce_len; + /* For backward compatibility, replace "t." instead of inserting + the new linkonce_kind (but not for "prop" sections). */ + if (CONST_STRNEQ (suffix, "t.") && linkonce_kind[1] == '.') + suffix += 2; + strcat (prop_sec_name + linkonce_len, suffix); + } + else + prop_sec_name = strdup (base_name); + + return prop_sec_name; +} + + +static asection * +xtensa_get_property_section (asection *sec, const char *base_name) +{ + char *prop_sec_name; + asection *prop_sec; + + prop_sec_name = xtensa_property_section_name (sec, base_name); + prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name, + match_section_group, + (void *) elf_group_name (sec)); + free (prop_sec_name); + return prop_sec; +} + + +asection * +xtensa_make_property_section (asection *sec, const char *base_name) +{ + char *prop_sec_name; + asection *prop_sec; + + /* Check if the section already exists. */ + prop_sec_name = xtensa_property_section_name (sec, base_name); + prop_sec = bfd_get_section_by_name_if (sec->owner, prop_sec_name, + match_section_group, + (void *) elf_group_name (sec)); + /* If not, create it. */ + if (! prop_sec) + { + flagword flags = (SEC_RELOC | SEC_HAS_CONTENTS | SEC_READONLY); + flags |= (bfd_get_section_flags (sec->owner, sec) + & (SEC_LINK_ONCE | SEC_LINK_DUPLICATES)); + + prop_sec = bfd_make_section_anyway_with_flags + (sec->owner, strdup (prop_sec_name), flags); + if (! prop_sec) + return 0; + + elf_group_name (prop_sec) = elf_group_name (sec); + } + + free (prop_sec_name); + return prop_sec; +} + + +flagword +xtensa_get_property_predef_flags (asection *sec) +{ + if (xtensa_is_insntable_section (sec)) + return (XTENSA_PROP_INSN + | XTENSA_PROP_NO_TRANSFORM + | XTENSA_PROP_INSN_NO_REORDER); + + if (xtensa_is_littable_section (sec)) + return (XTENSA_PROP_LITERAL + | XTENSA_PROP_NO_TRANSFORM + | XTENSA_PROP_INSN_NO_REORDER); + + return 0; +} + + +/* Other functions called directly by the linker. */ + +bfd_boolean +xtensa_callback_required_dependence (bfd *abfd, + asection *sec, + struct bfd_link_info *link_info, + deps_callback_t callback, + void *closure) +{ + Elf_Internal_Rela *internal_relocs; + bfd_byte *contents; + unsigned i; + bfd_boolean ok = TRUE; + bfd_size_type sec_size; + + sec_size = bfd_get_section_limit (abfd, sec); + + /* ".plt*" sections have no explicit relocations but they contain L32R + instructions that reference the corresponding ".got.plt*" sections. */ + if ((sec->flags & SEC_LINKER_CREATED) != 0 + && CONST_STRNEQ (sec->name, ".plt")) + { + asection *sgotplt; + + /* Find the corresponding ".got.plt*" section. */ + if (sec->name[4] == '\0') + sgotplt = bfd_get_linker_section (sec->owner, ".got.plt"); + else + { + char got_name[14]; + int chunk = 0; + + BFD_ASSERT (sec->name[4] == '.'); + chunk = strtol (&sec->name[5], NULL, 10); + + sprintf (got_name, ".got.plt.%u", chunk); + sgotplt = bfd_get_linker_section (sec->owner, got_name); + } + BFD_ASSERT (sgotplt); + + /* Assume worst-case offsets: L32R at the very end of the ".plt" + section referencing a literal at the very beginning of + ".got.plt". This is very close to the real dependence, anyway. */ + (*callback) (sec, sec_size, sgotplt, 0, closure); + } + + /* Only ELF files are supported for Xtensa. Check here to avoid a segfault + when building uclibc, which runs "ld -b binary /dev/null". */ + if (bfd_get_flavour (abfd) != bfd_target_elf_flavour) + return ok; + + internal_relocs = retrieve_internal_relocs (abfd, sec, + link_info->keep_memory); + if (internal_relocs == NULL + || sec->reloc_count == 0) + return ok; + + /* Cache the contents for the duration of this scan. */ + contents = retrieve_contents (abfd, sec, link_info->keep_memory); + if (contents == NULL && sec_size != 0) + { + ok = FALSE; + goto error_return; + } + + if (!xtensa_default_isa) + xtensa_default_isa = xtensa_isa_init (0, 0); + + for (i = 0; i < sec->reloc_count; i++) + { + Elf_Internal_Rela *irel = &internal_relocs[i]; + if (is_l32r_relocation (abfd, sec, contents, irel)) + { + r_reloc l32r_rel; + asection *target_sec; + bfd_vma target_offset; + + r_reloc_init (&l32r_rel, abfd, irel, contents, sec_size); + target_sec = NULL; + target_offset = 0; + /* L32Rs must be local to the input file. */ + if (r_reloc_is_defined (&l32r_rel)) + { + target_sec = r_reloc_get_section (&l32r_rel); + target_offset = l32r_rel.target_offset; + } + (*callback) (sec, irel->r_offset, target_sec, target_offset, + closure); + } + } + + error_return: + release_internal_relocs (sec, internal_relocs); + release_contents (sec, contents); + return ok; +} + +/* The default literal sections should always be marked as "code" (i.e., + SHF_EXECINSTR). This is particularly important for the Linux kernel + module loader so that the literals are not placed after the text. */ +static const struct bfd_elf_special_section elf_xtensa_special_sections[] = +{ + { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, + { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, + { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS, SHF_ALLOC + SHF_EXECINSTR }, + { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE, 0 }, + { NULL, 0, 0, 0, 0 } +}; + +#define ELF_TARGET_ID XTENSA_ELF_DATA +#ifndef ELF_ARCH +#define TARGET_LITTLE_SYM xtensa_elf32_le_vec +#define TARGET_LITTLE_NAME "elf32-xtensa-le" +#define TARGET_BIG_SYM xtensa_elf32_be_vec +#define TARGET_BIG_NAME "elf32-xtensa-be" +#define ELF_ARCH bfd_arch_xtensa + +#define ELF_MACHINE_CODE EM_XTENSA +#define ELF_MACHINE_ALT1 EM_XTENSA_OLD + +#if XCHAL_HAVE_MMU +#define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE) +#else /* !XCHAL_HAVE_MMU */ +#define ELF_MAXPAGESIZE 1 +#endif /* !XCHAL_HAVE_MMU */ +#endif /* ELF_ARCH */ + +#define elf_backend_can_gc_sections 1 +#define elf_backend_can_refcount 1 +#define elf_backend_plt_readonly 1 +#define elf_backend_got_header_size 4 +#define elf_backend_want_dynbss 0 +#define elf_backend_want_got_plt 1 + +#define elf_info_to_howto elf_xtensa_info_to_howto_rela + +#define bfd_elf32_mkobject elf_xtensa_mkobject + +#define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data +#define bfd_elf32_new_section_hook elf_xtensa_new_section_hook +#define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data +#define bfd_elf32_bfd_relax_section elf_xtensa_relax_section +#define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup +#define bfd_elf32_bfd_reloc_name_lookup \ + elf_xtensa_reloc_name_lookup +#define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags +#define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create + +#define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol +#define elf_backend_check_relocs elf_xtensa_check_relocs +#define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections +#define elf_backend_discard_info elf_xtensa_discard_info +#define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs +#define elf_backend_final_write_processing elf_xtensa_final_write_processing +#define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections +#define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol +#define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook +#define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook +#define elf_backend_grok_prstatus elf_xtensa_grok_prstatus +#define elf_backend_grok_psinfo elf_xtensa_grok_psinfo +#define elf_backend_hide_symbol elf_xtensa_hide_symbol +#define elf_backend_object_p elf_xtensa_object_p +#define elf_backend_reloc_type_class elf_xtensa_reloc_type_class +#define elf_backend_relocate_section elf_xtensa_relocate_section +#define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections +#define elf_backend_always_size_sections elf_xtensa_always_size_sections +#define elf_backend_omit_section_dynsym \ + ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) +#define elf_backend_special_sections elf_xtensa_special_sections +#define elf_backend_action_discarded elf_xtensa_action_discarded +#define elf_backend_copy_indirect_symbol elf_xtensa_copy_indirect_symbol + +#include "elf32-target.h" |