diff options
Diffstat (limited to 'bfd/elf32-m32r.c')
| -rw-r--r-- | bfd/elf32-m32r.c | 2193 |
1 files changed, 0 insertions, 2193 deletions
diff --git a/bfd/elf32-m32r.c b/bfd/elf32-m32r.c deleted file mode 100644 index 1b82d9db173..00000000000 --- a/bfd/elf32-m32r.c +++ /dev/null @@ -1,2193 +0,0 @@ -/* M32R-specific support for 32-bit ELF. - Copyright 1996, 1997, 1998, 1999, 2000, 2001 - 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "bfd.h" -#include "sysdep.h" -#include "libbfd.h" -#include "elf-bfd.h" -#include "elf/m32r.h" - -static bfd_reloc_status_type m32r_elf_10_pcrel_reloc - PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); -static bfd_reloc_status_type m32r_elf_do_10_pcrel_reloc - PARAMS ((bfd *, reloc_howto_type *, asection *, - bfd_byte *, bfd_vma, asection *, bfd_vma, bfd_vma)); -static bfd_reloc_status_type m32r_elf_hi16_reloc - PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); -static void m32r_elf_relocate_hi16 - PARAMS ((bfd *, int, Elf_Internal_Rela *, Elf_Internal_Rela *, - bfd_byte *, bfd_vma)); -bfd_reloc_status_type m32r_elf_lo16_reloc - PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); -bfd_reloc_status_type m32r_elf_generic_reloc - PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); -static bfd_reloc_status_type m32r_elf_sda16_reloc - PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); -static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup - PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); -static void m32r_info_to_howto_rel - PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); -boolean _bfd_m32r_elf_section_from_bfd_section - PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *, int *)); -void _bfd_m32r_elf_symbol_processing - PARAMS ((bfd *, asymbol *)); -static boolean m32r_elf_add_symbol_hook - PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *, - const char **, flagword *, asection **, bfd_vma *)); -static boolean m32r_elf_relocate_section - PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, - Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); -#if 0 /* not yet */ -static boolean m32r_elf_relax_delete_bytes - PARAMS ((bfd *, asection *, bfd_vma, int)); -#endif - -static bfd_reloc_status_type m32r_elf_final_sda_base - PARAMS ((bfd *, struct bfd_link_info *, const char **, bfd_vma *)); -static boolean m32r_elf_object_p - PARAMS ((bfd *)); -static void m32r_elf_final_write_processing - PARAMS ((bfd *, boolean)); -static boolean m32r_elf_set_private_flags - PARAMS ((bfd *, flagword)); -static boolean m32r_elf_copy_private_bfd_data - PARAMS ((bfd *, bfd *)); -static boolean m32r_elf_merge_private_bfd_data - PARAMS ((bfd *, bfd *)); -static boolean m32r_elf_print_private_bfd_data - PARAMS ((bfd *, PTR)); - -#define NOP_INSN 0x7000 -#define MAKE_PARALLEL(insn) ((insn) | 0x8000) - -/* Use REL instead of RELA to save space. - This only saves space in libraries and object files, but perhaps - relocs will be put in ROM? All in all though, REL relocs are a pain - to work with. */ -#define USE_REL - -static reloc_howto_type m32r_elf_howto_table[] = -{ - /* This reloc does nothing. */ - HOWTO (R_M32R_NONE, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 32, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_bitfield, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ - "R_M32R_NONE", /* name */ - false, /* partial_inplace */ - 0, /* src_mask */ - 0, /* dst_mask */ - false), /* pcrel_offset */ - - /* A 16 bit absolute relocation. */ - HOWTO (R_M32R_16, /* type */ - 0, /* rightshift */ - 1, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_bitfield, /* complain_on_overflow */ - m32r_elf_generic_reloc,/* special_function */ - "R_M32R_16", /* name */ - true, /* partial_inplace */ - 0xffff, /* src_mask */ - 0xffff, /* dst_mask */ - false), /* pcrel_offset */ - - /* A 32 bit absolute relocation. */ - HOWTO (R_M32R_32, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 32, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_bitfield, /* complain_on_overflow */ - m32r_elf_generic_reloc,/* special_function */ - "R_M32R_32", /* name */ - true, /* partial_inplace */ - 0xffffffff, /* src_mask */ - 0xffffffff, /* dst_mask */ - false), /* pcrel_offset */ - - /* A 24 bit address. */ - HOWTO (R_M32R_24, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 24, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_unsigned, /* complain_on_overflow */ - m32r_elf_generic_reloc,/* special_function */ - "R_M32R_24", /* name */ - true, /* partial_inplace */ - 0xffffff, /* src_mask */ - 0xffffff, /* dst_mask */ - false), /* pcrel_offset */ - - /* An PC Relative 10-bit relocation, shifted by 2. - This reloc is complicated because relocations are relative to pc & -4. - i.e. branches in the right insn slot use the address of the left insn - slot for pc. */ - /* ??? It's not clear whether this should have partial_inplace set or not. - Branch relaxing in the assembler can store the addend in the insn, - and if bfd_install_relocation gets called the addend may get added - again. */ - HOWTO (R_M32R_10_PCREL, /* type */ - 2, /* rightshift */ - 1, /* size (0 = byte, 1 = short, 2 = long) */ - 10, /* bitsize */ - true, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_signed, /* complain_on_overflow */ - m32r_elf_10_pcrel_reloc, /* special_function */ - "R_M32R_10_PCREL", /* name */ - false, /* partial_inplace */ - 0xff, /* src_mask */ - 0xff, /* dst_mask */ - true), /* pcrel_offset */ - - /* A relative 18 bit relocation, right shifted by 2. */ - HOWTO (R_M32R_18_PCREL, /* type */ - 2, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - true, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ - "R_M32R_18_PCREL", /* name */ - false, /* partial_inplace */ - 0xffff, /* src_mask */ - 0xffff, /* dst_mask */ - true), /* pcrel_offset */ - - /* A relative 26 bit relocation, right shifted by 2. */ - /* ??? It's not clear whether this should have partial_inplace set or not. - Branch relaxing in the assembler can store the addend in the insn, - and if bfd_install_relocation gets called the addend may get added - again. */ - HOWTO (R_M32R_26_PCREL, /* type */ - 2, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 26, /* bitsize */ - true, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_signed, /* complain_on_overflow */ - bfd_elf_generic_reloc, /* special_function */ - "R_M32R_26_PCREL", /* name */ - false, /* partial_inplace */ - 0xffffff, /* src_mask */ - 0xffffff, /* dst_mask */ - true), /* pcrel_offset */ - - /* High 16 bits of address when lower 16 is or'd in. */ - HOWTO (R_M32R_HI16_ULO, /* type */ - 16, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - m32r_elf_hi16_reloc, /* special_function */ - "R_M32R_HI16_ULO", /* name */ - true, /* partial_inplace */ - 0x0000ffff, /* src_mask */ - 0x0000ffff, /* dst_mask */ - false), /* pcrel_offset */ - - /* High 16 bits of address when lower 16 is added in. */ - HOWTO (R_M32R_HI16_SLO, /* type */ - 16, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - m32r_elf_hi16_reloc, /* special_function */ - "R_M32R_HI16_SLO", /* name */ - true, /* partial_inplace */ - 0x0000ffff, /* src_mask */ - 0x0000ffff, /* dst_mask */ - false), /* pcrel_offset */ - - /* Lower 16 bits of address. */ - HOWTO (R_M32R_LO16, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - m32r_elf_lo16_reloc, /* special_function */ - "R_M32R_LO16", /* name */ - true, /* partial_inplace */ - 0x0000ffff, /* src_mask */ - 0x0000ffff, /* dst_mask */ - false), /* pcrel_offset */ - - /* Small data area 16 bits offset. */ - HOWTO (R_M32R_SDA16, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 16, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_signed, /* complain_on_overflow */ - m32r_elf_sda16_reloc, /* special_function */ - "R_M32R_SDA16", /* name */ - true, /* partial_inplace */ /* FIXME: correct? */ - 0x0000ffff, /* src_mask */ - 0x0000ffff, /* dst_mask */ - false), /* pcrel_offset */ - - /* GNU extension to record C++ vtable hierarchy */ - HOWTO (R_M32R_GNU_VTINHERIT, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 0, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - NULL, /* special_function */ - "R_M32R_GNU_VTINHERIT", /* name */ - false, /* partial_inplace */ - 0, /* src_mask */ - 0, /* dst_mask */ - false), /* pcrel_offset */ - - /* GNU extension to record C++ vtable member usage */ - HOWTO (R_M32R_GNU_VTENTRY, /* type */ - 0, /* rightshift */ - 2, /* size (0 = byte, 1 = short, 2 = long) */ - 0, /* bitsize */ - false, /* pc_relative */ - 0, /* bitpos */ - complain_overflow_dont, /* complain_on_overflow */ - _bfd_elf_rel_vtable_reloc_fn, /* special_function */ - "R_M32R_GNU_VTENTRY", /* name */ - false, /* partial_inplace */ - 0, /* src_mask */ - 0, /* dst_mask */ - false), /* pcrel_offset */ - -}; - -/* Handle the R_M32R_10_PCREL reloc. */ - -static bfd_reloc_status_type -m32r_elf_10_pcrel_reloc (abfd, reloc_entry, symbol, data, - input_section, output_bfd, error_message) - bfd * abfd; - arelent * reloc_entry; - asymbol * symbol; - PTR data; - asection * input_section; - bfd * output_bfd; - char ** error_message ATTRIBUTE_UNUSED; -{ - /* This part is from bfd_elf_generic_reloc. */ - if (output_bfd != (bfd *) NULL - && (symbol->flags & BSF_SECTION_SYM) == 0 - && (! reloc_entry->howto->partial_inplace - || reloc_entry->addend == 0)) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - if (output_bfd != NULL) - { - /* FIXME: See bfd_perform_relocation. Is this right? */ - return bfd_reloc_continue; - } - - return m32r_elf_do_10_pcrel_reloc (abfd, reloc_entry->howto, - input_section, - data, reloc_entry->address, - symbol->section, - (symbol->value - + symbol->section->output_section->vma - + symbol->section->output_offset), - reloc_entry->addend); -} - -/* Utility to actually perform an R_M32R_10_PCREL reloc. */ - -static bfd_reloc_status_type -m32r_elf_do_10_pcrel_reloc (abfd, howto, input_section, data, offset, - symbol_section, symbol_value, addend) - bfd *abfd; - reloc_howto_type *howto; - asection *input_section; - bfd_byte *data; - bfd_vma offset; - asection *symbol_section ATTRIBUTE_UNUSED; - bfd_vma symbol_value; - bfd_vma addend; -{ - bfd_signed_vma relocation; - unsigned long x; - bfd_reloc_status_type status; - - /* Sanity check the address (offset in section). */ - if (offset > input_section->_cooked_size) - return bfd_reloc_outofrange; - - relocation = symbol_value + addend; - /* Make it pc relative. */ - relocation -= (input_section->output_section->vma - + input_section->output_offset); - /* These jumps mask off the lower two bits of the current address - before doing pcrel calculations. */ - relocation -= (offset & -4L); - - if (relocation < -0x200 || relocation > 0x1ff) - status = bfd_reloc_overflow; - else - status = bfd_reloc_ok; - - x = bfd_get_16 (abfd, data + offset); - relocation >>= howto->rightshift; - relocation <<= howto->bitpos; - x = (x & ~howto->dst_mask) | (((x & howto->src_mask) + relocation) & howto->dst_mask); - bfd_put_16 (abfd, x, data + offset); - - return status; -} - -/* Handle the R_M32R_HI16_[SU]LO relocs. - HI16_SLO is for the add3 and load/store with displacement instructions. - HI16_ULO is for the or3 instruction. - For R_M32R_HI16_SLO, the lower 16 bits are sign extended when added to - the high 16 bytes so if the lower 16 bits are negative (bit 15 == 1) then - we must add one to the high 16 bytes (which will get subtracted off when - the low 16 bits are added). - These relocs have to be done in combination with an R_M32R_LO16 reloc - because there is a carry from the LO16 to the HI16. Here we just save - the information we need; we do the actual relocation when we see the LO16. - This code is copied from the elf32-mips.c. We also support an arbitrary - number of HI16 relocs to be associated with a single LO16 reloc. The - assembler sorts the relocs to ensure each HI16 immediately precedes its - LO16. However if there are multiple copies, the assembler may not find - the real LO16 so it picks the first one it finds. */ - -struct m32r_hi16 -{ - struct m32r_hi16 *next; - bfd_byte *addr; - bfd_vma addend; -}; - -/* FIXME: This should not be a static variable. */ - -static struct m32r_hi16 *m32r_hi16_list; - -static bfd_reloc_status_type -m32r_elf_hi16_reloc (abfd, reloc_entry, symbol, data, - input_section, output_bfd, error_message) - bfd *abfd ATTRIBUTE_UNUSED; - arelent *reloc_entry; - asymbol *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message ATTRIBUTE_UNUSED; -{ - bfd_reloc_status_type ret; - bfd_vma relocation; - struct m32r_hi16 *n; - - /* This part is from bfd_elf_generic_reloc. - If we're relocating, and this an external symbol, we don't want - to change anything. */ - if (output_bfd != (bfd *) NULL - && (symbol->flags & BSF_SECTION_SYM) == 0 - && reloc_entry->addend == 0) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - /* Sanity check the address (offset in section). */ - if (reloc_entry->address > input_section->_cooked_size) - return bfd_reloc_outofrange; - - ret = bfd_reloc_ok; - if (bfd_is_und_section (symbol->section) - && output_bfd == (bfd *) NULL) - ret = bfd_reloc_undefined; - - if (bfd_is_com_section (symbol->section)) - relocation = 0; - else - relocation = symbol->value; - - relocation += symbol->section->output_section->vma; - relocation += symbol->section->output_offset; - relocation += reloc_entry->addend; - - /* Save the information, and let LO16 do the actual relocation. */ - n = (struct m32r_hi16 *) bfd_malloc (sizeof *n); - if (n == NULL) - return bfd_reloc_outofrange; - n->addr = (bfd_byte *) data + reloc_entry->address; - n->addend = relocation; - n->next = m32r_hi16_list; - m32r_hi16_list = n; - - if (output_bfd != (bfd *) NULL) - reloc_entry->address += input_section->output_offset; - - return ret; -} - -/* Handle an M32R ELF HI16 reloc. */ - -static void -m32r_elf_relocate_hi16 (input_bfd, type, relhi, rello, contents, addend) - bfd *input_bfd; - int type; - Elf_Internal_Rela *relhi; - Elf_Internal_Rela *rello; - bfd_byte *contents; - bfd_vma addend; -{ - unsigned long insn; - bfd_vma addlo; - - insn = bfd_get_32 (input_bfd, contents + relhi->r_offset); - - addlo = bfd_get_32 (input_bfd, contents + rello->r_offset); - if (type == R_M32R_HI16_SLO) - addlo = ((addlo & 0xffff) ^ 0x8000) - 0x8000; - else - addlo &= 0xffff; - - addend += ((insn & 0xffff) << 16) + addlo; - - /* Reaccount for sign extension of low part. */ - if (type == R_M32R_HI16_SLO - && (addend & 0x8000) != 0) - addend += 0x10000; - - bfd_put_32 (input_bfd, - (insn & 0xffff0000) | ((addend >> 16) & 0xffff), - contents + relhi->r_offset); -} - -/* Do an R_M32R_LO16 relocation. This is a straightforward 16 bit - inplace relocation; this function exists in order to do the - R_M32R_HI16_[SU]LO relocation described above. */ - -bfd_reloc_status_type -m32r_elf_lo16_reloc (input_bfd, reloc_entry, symbol, data, - input_section, output_bfd, error_message) - bfd *input_bfd; - arelent *reloc_entry; - asymbol *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message; -{ - /* This part is from bfd_elf_generic_reloc. - If we're relocating, and this an external symbol, we don't want - to change anything. */ - if (output_bfd != (bfd *) NULL - && (symbol->flags & BSF_SECTION_SYM) == 0 - && reloc_entry->addend == 0) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - if (m32r_hi16_list != NULL) - { - struct m32r_hi16 *l; - - l = m32r_hi16_list; - while (l != NULL) - { - unsigned long insn; - unsigned long val; - unsigned long vallo; - struct m32r_hi16 *next; - - /* Do the HI16 relocation. Note that we actually don't need - to know anything about the LO16 itself, except where to - find the low 16 bits of the addend needed by the LO16. */ - insn = bfd_get_32 (input_bfd, l->addr); - vallo = ((bfd_get_32 (input_bfd, (bfd_byte *) data + reloc_entry->address) - & 0xffff) ^ 0x8000) - 0x8000; - val = ((insn & 0xffff) << 16) + vallo; - val += l->addend; - - /* Reaccount for sign extension of low part. */ - if ((val & 0x8000) != 0) - val += 0x10000; - - insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff); - bfd_put_32 (input_bfd, insn, l->addr); - - next = l->next; - free (l); - l = next; - } - - m32r_hi16_list = NULL; - } - - /* Now do the LO16 reloc in the usual way. - ??? It would be nice to call bfd_elf_generic_reloc here, - but we have partial_inplace == TRUE. bfd_elf_generic_reloc will - pass the handling back to bfd_install_relocation which will install - a section relative addend which is wrong. */ - return m32r_elf_generic_reloc (input_bfd, reloc_entry, symbol, data, - input_section, output_bfd, error_message); -} - -/* Do generic partial_inplace relocation. - This is a local replacement for bfd_elf_generic_reloc. */ - -bfd_reloc_status_type -m32r_elf_generic_reloc (input_bfd, reloc_entry, symbol, data, - input_section, output_bfd, error_message) - bfd *input_bfd; - arelent *reloc_entry; - asymbol *symbol; - PTR data; - asection *input_section; - bfd *output_bfd; - char **error_message ATTRIBUTE_UNUSED; -{ - bfd_reloc_status_type ret; - bfd_vma relocation; - bfd_byte *inplace_address; - - /* This part is from bfd_elf_generic_reloc. - If we're relocating, and this an external symbol, we don't want - to change anything. */ - if (output_bfd != (bfd *) NULL - && (symbol->flags & BSF_SECTION_SYM) == 0 - && reloc_entry->addend == 0) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - /* Now do the the reloc in the usual way. - ??? It would be nice to call bfd_elf_generic_reloc here, - but we have partial_inplace == TRUE. bfd_elf_generic_reloc will - pass the handling back to bfd_install_relocation which will install - a section relative addend which is wrong. */ - - /* Sanity check the address (offset in section). */ - if (reloc_entry->address > input_section->_cooked_size) - return bfd_reloc_outofrange; - - ret = bfd_reloc_ok; - if (bfd_is_und_section (symbol->section) - && output_bfd == (bfd *) NULL) - ret = bfd_reloc_undefined; - - if (bfd_is_com_section (symbol->section) - || output_bfd != (bfd *) NULL) - relocation = 0; - else - relocation = symbol->value; - - /* Only do this for a final link. */ - if (output_bfd == (bfd *) NULL) - { - relocation += symbol->section->output_section->vma; - relocation += symbol->section->output_offset; - } - - relocation += reloc_entry->addend; - inplace_address = (bfd_byte *) data + reloc_entry->address; - -#define DOIT(x) \ - x = ( (x & ~reloc_entry->howto->dst_mask) | \ - (((x & reloc_entry->howto->src_mask) + relocation) & \ - reloc_entry->howto->dst_mask)) - - switch (reloc_entry->howto->size) - { - case 1: - { - short x = bfd_get_16 (input_bfd, inplace_address); - DOIT (x); - bfd_put_16 (input_bfd, x, inplace_address); - } - break; - case 2: - { - unsigned long x = bfd_get_32 (input_bfd, inplace_address); - DOIT (x); - bfd_put_32 (input_bfd, x, inplace_address); - } - break; - default: - BFD_ASSERT (0); - } - - if (output_bfd != (bfd *) NULL) - reloc_entry->address += input_section->output_offset; - - return ret; -} - -/* Handle the R_M32R_SDA16 reloc. - This reloc is used to compute the address of objects in the small data area - and to perform loads and stores from that area. - The lower 16 bits are sign extended and added to the register specified - in the instruction, which is assumed to point to _SDA_BASE_. */ - -static bfd_reloc_status_type -m32r_elf_sda16_reloc (abfd, reloc_entry, symbol, data, - input_section, output_bfd, error_message) - bfd *abfd ATTRIBUTE_UNUSED; - arelent *reloc_entry; - asymbol *symbol; - PTR data ATTRIBUTE_UNUSED; - asection *input_section; - bfd *output_bfd; - char **error_message ATTRIBUTE_UNUSED; -{ - /* This part is from bfd_elf_generic_reloc. */ - if (output_bfd != (bfd *) NULL - && (symbol->flags & BSF_SECTION_SYM) == 0 - && (! reloc_entry->howto->partial_inplace - || reloc_entry->addend == 0)) - { - reloc_entry->address += input_section->output_offset; - return bfd_reloc_ok; - } - - if (output_bfd != NULL) - { - /* FIXME: See bfd_perform_relocation. Is this right? */ - return bfd_reloc_continue; - } - - /* FIXME: not sure what to do here yet. But then again, the linker - may never call us. */ - abort (); -} - -/* Map BFD reloc types to M32R ELF reloc types. */ - -struct m32r_reloc_map -{ - bfd_reloc_code_real_type bfd_reloc_val; - unsigned char elf_reloc_val; -}; - -static const struct m32r_reloc_map m32r_reloc_map[] = -{ - { BFD_RELOC_NONE, R_M32R_NONE }, - { BFD_RELOC_16, R_M32R_16 }, - { BFD_RELOC_32, R_M32R_32 }, - { BFD_RELOC_M32R_24, R_M32R_24 }, - { BFD_RELOC_M32R_10_PCREL, R_M32R_10_PCREL }, - { BFD_RELOC_M32R_18_PCREL, R_M32R_18_PCREL }, - { BFD_RELOC_M32R_26_PCREL, R_M32R_26_PCREL }, - { BFD_RELOC_M32R_HI16_ULO, R_M32R_HI16_ULO }, - { BFD_RELOC_M32R_HI16_SLO, R_M32R_HI16_SLO }, - { BFD_RELOC_M32R_LO16, R_M32R_LO16 }, - { BFD_RELOC_M32R_SDA16, R_M32R_SDA16 }, - { BFD_RELOC_VTABLE_INHERIT, R_M32R_GNU_VTINHERIT }, - { BFD_RELOC_VTABLE_ENTRY, R_M32R_GNU_VTENTRY }, -}; - -static reloc_howto_type * -bfd_elf32_bfd_reloc_type_lookup (abfd, code) - bfd *abfd ATTRIBUTE_UNUSED; - bfd_reloc_code_real_type code; -{ - unsigned int i; - - for (i = 0; - i < sizeof (m32r_reloc_map) / sizeof (struct m32r_reloc_map); - i++) - { - if (m32r_reloc_map[i].bfd_reloc_val == code) - return &m32r_elf_howto_table[m32r_reloc_map[i].elf_reloc_val]; - } - - return NULL; -} - -/* Set the howto pointer for an M32R ELF reloc. */ - -static void -m32r_info_to_howto_rel (abfd, cache_ptr, dst) - bfd *abfd ATTRIBUTE_UNUSED; - arelent *cache_ptr; - Elf32_Internal_Rel *dst; -{ - unsigned int r_type; - - r_type = ELF32_R_TYPE (dst->r_info); - BFD_ASSERT (r_type < (unsigned int) R_M32R_max); - cache_ptr->howto = &m32r_elf_howto_table[r_type]; -} - -/* Given a BFD section, try to locate the corresponding ELF section - index. */ - -boolean -_bfd_m32r_elf_section_from_bfd_section (abfd, hdr, sec, retval) - bfd *abfd ATTRIBUTE_UNUSED; - Elf32_Internal_Shdr *hdr ATTRIBUTE_UNUSED; - asection *sec; - int *retval; -{ - if (strcmp (bfd_get_section_name (abfd, sec), ".scommon") == 0) - { - *retval = SHN_M32R_SCOMMON; - return true; - } - return false; -} - -/* M32R ELF uses two common sections. One is the usual one, and the other - is for small objects. All the small objects are kept together, and then - referenced via one register, which yields faster assembler code. It is - up to the compiler to emit an instruction to load the register with - _SDA_BASE. This is what we use for the small common section. This - approach is copied from elf32-mips.c. */ -static asection m32r_elf_scom_section; -static asymbol m32r_elf_scom_symbol; -static asymbol *m32r_elf_scom_symbol_ptr; - -/* Handle the special M32R section numbers that a symbol may use. */ - -void -_bfd_m32r_elf_symbol_processing (abfd, asym) - bfd *abfd ATTRIBUTE_UNUSED; - asymbol *asym; -{ - elf_symbol_type *elfsym; - - elfsym = (elf_symbol_type *) asym; - - switch (elfsym->internal_elf_sym.st_shndx) - { - case SHN_M32R_SCOMMON: - if (m32r_elf_scom_section.name == NULL) - { - /* Initialize the small common section. */ - m32r_elf_scom_section.name = ".scommon"; - m32r_elf_scom_section.flags = SEC_IS_COMMON; - m32r_elf_scom_section.output_section = &m32r_elf_scom_section; - m32r_elf_scom_section.symbol = &m32r_elf_scom_symbol; - m32r_elf_scom_section.symbol_ptr_ptr = &m32r_elf_scom_symbol_ptr; - m32r_elf_scom_symbol.name = ".scommon"; - m32r_elf_scom_symbol.flags = BSF_SECTION_SYM; - m32r_elf_scom_symbol.section = &m32r_elf_scom_section; - m32r_elf_scom_symbol_ptr = &m32r_elf_scom_symbol; - } - asym->section = &m32r_elf_scom_section; - asym->value = elfsym->internal_elf_sym.st_size; - break; - } -} - -/* Hook called by the linker routine which adds symbols from an object - file. We must handle the special M32R section numbers here. - We also keep watching for whether we need to create the sdata special - linker sections. */ - -static boolean -m32r_elf_add_symbol_hook (abfd, info, sym, namep, flagsp, secp, valp) - bfd *abfd; - struct bfd_link_info *info; - const Elf_Internal_Sym *sym; - const char **namep; - flagword *flagsp ATTRIBUTE_UNUSED; - asection **secp; - bfd_vma *valp; -{ - if (! info->relocateable - && (*namep)[0] == '_' && (*namep)[1] == 'S' - && strcmp (*namep, "_SDA_BASE_") == 0) - { - /* This is simpler than using _bfd_elf_create_linker_section - (our needs are simpler than ppc's needs). Also - _bfd_elf_create_linker_section currently has a bug where if a .sdata - section already exists a new one is created that follows it which - screws of _SDA_BASE_ address calcs because output_offset != 0. */ - struct elf_link_hash_entry *h; - asection *s = bfd_get_section_by_name (abfd, ".sdata"); - - /* The following code was cobbled from elf32-ppc.c and elflink.c. */ - - if (s == NULL) - { - int flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS - | SEC_IN_MEMORY | SEC_LINKER_CREATED); - - s = bfd_make_section_anyway (abfd, ".sdata"); - if (s == NULL) - return false; - bfd_set_section_flags (abfd, s, flags); - bfd_set_section_alignment (abfd, s, 2); - } - - h = (struct elf_link_hash_entry *) - bfd_link_hash_lookup (info->hash, "_SDA_BASE_", false, false, false); - - if ((h == NULL || h->root.type == bfd_link_hash_undefined) - && !(_bfd_generic_link_add_one_symbol (info, - abfd, - "_SDA_BASE_", - BSF_GLOBAL, - s, - 32768, - (const char *) NULL, - false, - get_elf_backend_data (abfd)->collect, - (struct bfd_link_hash_entry **) &h))) - return false; - h->type = STT_OBJECT; - } - - switch (sym->st_shndx) - { - case SHN_M32R_SCOMMON: - *secp = bfd_make_section_old_way (abfd, ".scommon"); - (*secp)->flags |= SEC_IS_COMMON; - *valp = sym->st_size; - break; - } - - return true; -} - -/* We have to figure out the SDA_BASE value, so that we can adjust the - symbol value correctly. We look up the symbol _SDA_BASE_ in the output - BFD. If we can't find it, we're stuck. We cache it in the ELF - target data. We don't need to adjust the symbol value for an - external symbol if we are producing relocateable output. */ - -static bfd_reloc_status_type -m32r_elf_final_sda_base (output_bfd, info, error_message, psb) - bfd *output_bfd; - struct bfd_link_info *info; - const char **error_message; - bfd_vma *psb; -{ - if (elf_gp (output_bfd) == 0) - { - struct bfd_link_hash_entry *h; - - h = bfd_link_hash_lookup (info->hash, "_SDA_BASE_", false, false, true); - if (h != (struct bfd_link_hash_entry *) NULL - && h->type == bfd_link_hash_defined) - elf_gp (output_bfd) = (h->u.def.value - + h->u.def.section->output_section->vma - + h->u.def.section->output_offset); - else - { - /* Only get the error once. */ - *psb = elf_gp (output_bfd) = 4; - *error_message = - (const char *) _("SDA relocation when _SDA_BASE_ not defined"); - return bfd_reloc_dangerous; - } - } - *psb = elf_gp (output_bfd); - return bfd_reloc_ok; -} - -/* Relocate an M32R/D ELF section. - There is some attempt to make this function usable for many architectures, - both USE_REL and USE_RELA ['twould be nice if such a critter existed], - if only to serve as a learning tool. - - The RELOCATE_SECTION function is called by the new ELF backend linker - to handle the relocations for a section. - - The relocs are always passed as Rela structures; if the section - actually uses Rel structures, the r_addend field will always be - zero. - - This function is responsible for adjust the section contents as - necessary, and (if using Rela relocs and generating a - relocateable output file) adjusting the reloc addend as - necessary. - - This function does not have to worry about setting the reloc - address or the reloc symbol index. - - LOCAL_SYMS is a pointer to the swapped in local symbols. - - LOCAL_SECTIONS is an array giving the section in the input file - corresponding to the st_shndx field of each local symbol. - - The global hash table entry for the global symbols can be found - via elf_sym_hashes (input_bfd). - - When generating relocateable output, this function must handle - STB_LOCAL/STT_SECTION symbols specially. The output symbol is - going to be the section symbol corresponding to the output - section, which means that the addend must be adjusted - accordingly. */ - -static boolean -m32r_elf_relocate_section (output_bfd, info, input_bfd, input_section, - contents, relocs, local_syms, local_sections) - bfd *output_bfd ATTRIBUTE_UNUSED; - 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; -{ - Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; - struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); - Elf_Internal_Rela *rel, *relend; - /* Assume success. */ - boolean ret = true; - - rel = relocs; - relend = relocs + input_section->reloc_count; - for (; rel < relend; rel++) - { - int r_type; - reloc_howto_type *howto; - unsigned long r_symndx; - /* We can't modify r_addend here as elf_link_input_bfd has an assert to - ensure it's zero (we use REL relocs, not RELA). Therefore this - should be assigning zero to `addend', but for clarity we use - `r_addend'. */ - bfd_vma addend = rel->r_addend; - bfd_vma offset = rel->r_offset; - struct elf_link_hash_entry *h; - Elf_Internal_Sym *sym; - asection *sec; - const char *sym_name; - bfd_reloc_status_type r; - const char *errmsg = NULL; - - h = NULL; - r_type = ELF32_R_TYPE (rel->r_info); - if (r_type < 0 || r_type >= (int) R_M32R_max) - { - (*_bfd_error_handler) (_("%s: unknown relocation type %d"), - bfd_get_filename (input_bfd), - (int) r_type); - bfd_set_error (bfd_error_bad_value); - ret = false; - continue; - } - - if (r_type == R_M32R_GNU_VTENTRY - || r_type == R_M32R_GNU_VTINHERIT) - continue; - - howto = m32r_elf_howto_table + r_type; - r_symndx = ELF32_R_SYM (rel->r_info); - - if (info->relocateable) - { - /* This is a relocateable link. 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. */ - sec = NULL; - if (r_symndx >= symtab_hdr->sh_info) - { - /* External symbol. */ - continue; - } - - /* Local symbol. */ - sym = local_syms + r_symndx; - sym_name = "<local symbol>"; - /* STT_SECTION: symbol is associated with a section. */ - if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) - { - /* Symbol isn't associated with a section. Nothing to do. */ - continue; - } - - sec = local_sections[r_symndx]; - addend += sec->output_offset + sym->st_value; -#ifndef USE_REL - /* This can't be done for USE_REL because it doesn't mean anything - and elf_link_input_bfd asserts this stays zero. */ - rel->r_addend = addend; -#endif - -#ifndef USE_REL - /* Addends are stored with relocs. We're done. */ - continue; -#else /* USE_REL */ - /* If partial_inplace, we need to store any additional addend - back in the section. */ - if (! howto->partial_inplace) - continue; - /* ??? Here is a nice place to call a special_function - like handler. */ - if (r_type != R_M32R_HI16_SLO && r_type != R_M32R_HI16_ULO) - r = _bfd_relocate_contents (howto, input_bfd, - addend, contents + offset); - else - { - Elf_Internal_Rela *lorel; - - /* We allow an arbitrary number of HI16 relocs before the - LO16 reloc. This permits gcc to emit the HI and LO relocs - itself. */ - for (lorel = rel + 1; - (lorel < relend - && (ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_SLO - || ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_ULO)); - lorel++) - continue; - if (lorel < relend - && ELF32_R_TYPE (lorel->r_info) == R_M32R_LO16) - { - m32r_elf_relocate_hi16 (input_bfd, r_type, rel, lorel, - contents, addend); - r = bfd_reloc_ok; - } - else - r = _bfd_relocate_contents (howto, input_bfd, - addend, contents + offset); - } -#endif /* USE_REL */ - } - else - { - bfd_vma relocation; - - /* This is a final link. */ - sym = NULL; - sec = NULL; - - if (r_symndx < symtab_hdr->sh_info) - { - /* Local symbol. */ - sym = local_syms + r_symndx; - sec = local_sections[r_symndx]; - sym_name = "<local symbol>"; - relocation = (sec->output_section->vma - + sec->output_offset - + sym->st_value); - } - else - { - /* External symbol. */ - 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; - sym_name = h->root.root.string; - - if (h->root.type == bfd_link_hash_defined - || h->root.type == bfd_link_hash_defweak) - { - sec = h->root.u.def.section; - if (sec->output_section == NULL) - relocation = 0; - else - relocation = (h->root.u.def.value - + sec->output_section->vma - + sec->output_offset); - } - else if (h->root.type == bfd_link_hash_undefweak) - relocation = 0; - else - { - if (! ((*info->callbacks->undefined_symbol) - (info, h->root.root.string, input_bfd, - input_section, offset, true))) - return false; - relocation = 0; - } - } - - /* Sanity check the address. */ - if (offset > input_section->_raw_size) - { - r = bfd_reloc_outofrange; - goto check_reloc; - } - - switch ((int) r_type) - { - case (int) R_M32R_10_PCREL : - r = m32r_elf_do_10_pcrel_reloc (input_bfd, howto, input_section, - contents, offset, - sec, relocation, addend); - break; - - case (int) R_M32R_HI16_SLO : - case (int) R_M32R_HI16_ULO : - { - Elf_Internal_Rela *lorel; - - /* We allow an arbitrary number of HI16 relocs before the - LO16 reloc. This permits gcc to emit the HI and LO relocs - itself. */ - for (lorel = rel + 1; - (lorel < relend - && (ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_SLO - || ELF32_R_TYPE (lorel->r_info) == R_M32R_HI16_ULO)); - lorel++) - continue; - if (lorel < relend - && ELF32_R_TYPE (lorel->r_info) == R_M32R_LO16) - { - m32r_elf_relocate_hi16 (input_bfd, r_type, rel, lorel, - contents, relocation + addend); - r = bfd_reloc_ok; - } - else - r = _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, offset, - relocation, addend); - } - break; - - case (int) R_M32R_SDA16 : - { - const char *name; - - BFD_ASSERT (sec != NULL); - name = bfd_get_section_name (abfd, sec); - - if (strcmp (name, ".sdata") == 0 - || strcmp (name, ".sbss") == 0 - || strcmp (name, ".scommon") == 0) - { - bfd_vma sda_base; - bfd *out_bfd = sec->output_section->owner; - - r = m32r_elf_final_sda_base (out_bfd, info, - &errmsg, - &sda_base); - if (r != bfd_reloc_ok) - { - ret = false; - goto check_reloc; - } - - /* At this point `relocation' contains the object's - address. */ - relocation -= sda_base; - /* Now it contains the offset from _SDA_BASE_. */ - } - else - { - (*_bfd_error_handler) (_("%s: The target (%s) of an %s relocation is in the wrong section (%s)"), - bfd_get_filename (input_bfd), - sym_name, - m32r_elf_howto_table[(int) r_type].name, - bfd_get_section_name (abfd, sec)); - /*bfd_set_error (bfd_error_bad_value); ??? why? */ - ret = false; - continue; - } - } - /* fall through */ - - default : - r = _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, offset, - relocation, addend); - break; - } - } - - check_reloc: - - if (r != bfd_reloc_ok) - { - /* FIXME: This should be generic enough to go in a utility. */ - const char *name; - - 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 (errmsg != NULL) - goto common_error; - - switch (r) - { - case bfd_reloc_overflow: - if (! ((*info->callbacks->reloc_overflow) - (info, name, howto->name, (bfd_vma) 0, - input_bfd, input_section, offset))) - return false; - break; - - case bfd_reloc_undefined: - if (! ((*info->callbacks->undefined_symbol) - (info, name, input_bfd, input_section, - offset, true))) - return false; - break; - - case bfd_reloc_outofrange: - errmsg = _("internal error: out of range error"); - goto common_error; - - case bfd_reloc_notsupported: - errmsg = _("internal error: unsupported relocation error"); - goto common_error; - - case bfd_reloc_dangerous: - errmsg = _("internal error: dangerous error"); - goto common_error; - - default: - errmsg = _("internal error: unknown error"); - /* fall through */ - - common_error: - if (!((*info->callbacks->warning) - (info, errmsg, name, input_bfd, input_section, - offset))) - return false; - break; - } - } - } - - return ret; -} - -#if 0 /* relaxing not supported yet */ - -/* This function handles relaxing for the m32r. - Relaxing on the m32r is tricky because of instruction alignment - requirements (4 byte instructions must be aligned on 4 byte boundaries). - - The following relaxing opportunities are handled: - - seth/add3/jl -> bl24 or bl8 - seth/add3 -> ld24 - - It would be nice to handle bl24 -> bl8 but given: - - - 4 byte insns must be on 4 byte boundaries - - branch instructions only branch to insns on 4 byte boundaries - - this isn't much of a win because the insn in the 2 "deleted" bytes - must become a nop. With some complexity some real relaxation could be - done but the frequency just wouldn't make it worth it; it's better to - try to do all the code compaction one can elsewhere. - When the chip supports parallel 16 bit insns, things may change. -*/ - -static boolean -m32r_elf_relax_section (abfd, sec, link_info, again) - bfd *abfd; - asection *sec; - struct bfd_link_info *link_info; - boolean *again; -{ - Elf_Internal_Shdr *symtab_hdr; - /* The Rela structures are used here because that's what - _bfd_elf32_link_read_relocs uses [for convenience - it sets the addend - field to 0]. */ - Elf_Internal_Rela *internal_relocs; - Elf_Internal_Rela *free_relocs = NULL; - Elf_Internal_Rela *irel, *irelend; - bfd_byte *contents = NULL; - bfd_byte *free_contents = NULL; - Elf32_External_Sym *extsyms = NULL; - Elf32_External_Sym *free_extsyms = NULL; - - /* Assume nothing changes. */ - *again = false; - - /* We don't have to do anything for a relocateable link, if - this section does not have relocs, or if this is not a - code section. */ - if (link_info->relocateable - || (sec->flags & SEC_RELOC) == 0 - || sec->reloc_count == 0 - || (sec->flags & SEC_CODE) == 0 - || 0 /* FIXME: check SHF_M32R_CAN_RELAX */) - return true; - - /* If this is the first time we have been called for this section, - initialize the cooked size. */ - if (sec->_cooked_size == 0) - sec->_cooked_size = sec->_raw_size; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - - /* Get a copy of the native relocations. */ - internal_relocs = (_bfd_elf32_link_read_relocs - (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL, - link_info->keep_memory)); - if (internal_relocs == NULL) - goto error_return; - if (! link_info->keep_memory) - free_relocs = internal_relocs; - - /* Walk through them looking for relaxing opportunities. */ - irelend = internal_relocs + sec->reloc_count; - for (irel = internal_relocs; irel < irelend; irel++) - { - bfd_vma symval; - - /* If this isn't something that can be relaxed, then ignore - this reloc. */ - if (ELF32_R_TYPE (irel->r_info) != (int) R_M32R_HI16_SLO) - continue; - - /* Get the section contents if we haven't done so already. */ - if (contents == NULL) - { - /* Get cached copy if it exists. */ - if (elf_section_data (sec)->this_hdr.contents != NULL) - contents = elf_section_data (sec)->this_hdr.contents; - else - { - /* Go get them off disk. */ - contents = (bfd_byte *) bfd_malloc (sec->_raw_size); - if (contents == NULL) - goto error_return; - free_contents = contents; - - if (! bfd_get_section_contents (abfd, sec, contents, - (file_ptr) 0, sec->_raw_size)) - goto error_return; - } - } - - /* Read this BFD's symbols if we haven't done so already. */ - if (extsyms == NULL) - { - /* Get cached copy if it exists. */ - if (symtab_hdr->contents != NULL) - extsyms = (Elf32_External_Sym *) symtab_hdr->contents; - else - { - /* Go get them off disk. */ - extsyms = ((Elf32_External_Sym *) - bfd_malloc (symtab_hdr->sh_size)); - if (extsyms == NULL) - goto error_return; - free_extsyms = extsyms; - if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 - || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) - != symtab_hdr->sh_size)) - goto error_return; - } - } - - /* Get the value of the symbol referred to by the reloc. */ - if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) - { - Elf_Internal_Sym isym; - asection *sym_sec; - - /* A local symbol. */ - bfd_elf32_swap_symbol_in (abfd, - extsyms + ELF32_R_SYM (irel->r_info), - &isym); - - sym_sec = bfd_section_from_elf_index (abfd, isym.st_shndx); - symval = (isym.st_value - + sym_sec->output_section->vma - + sym_sec->output_offset); - } - else - { - unsigned long indx; - struct elf_link_hash_entry *h; - - /* An external symbol. */ - indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; - h = elf_sym_hashes (abfd)[indx]; - BFD_ASSERT (h != NULL); - if (h->root.type != bfd_link_hash_defined - && h->root.type != bfd_link_hash_defweak) - { - /* This appears to be a reference to an undefined - symbol. Just ignore it--it will be caught by the - regular reloc processing. */ - continue; - } - - symval = (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset); - } - - /* For simplicity of coding, we are going to modify the section - contents, the section relocs, and the BFD symbol table. We - must tell the rest of the code not to free up this - information. It would be possible to instead create a table - of changes which have to be made, as is done in coff-mips.c; - that would be more work, but would require less memory when - the linker is run. */ - - /* Try to change a seth/add3/jl subroutine call to bl24 or bl8. - This sequence is generated by the compiler when compiling in - 32 bit mode. Also look for seth/add3 -> ld24. */ - - if (ELF32_R_TYPE (irel->r_info) == (int) R_M32R_HI16_SLO) - { - Elf_Internal_Rela *nrel; - bfd_vma pc = (sec->output_section->vma + sec->output_offset - + irel->r_offset); - bfd_signed_vma pcrel_value = symval - pc; - unsigned int code,reg; - int addend,nop_p,bl8_p,to_delete; - - /* The tests are ordered so that we get out as quickly as possible - if this isn't something we can relax, taking into account that - we are looking for two separate possibilities (jl/ld24). */ - - /* Do nothing if no room in the section for this to be what we're - looking for. */ - if (irel->r_offset > sec->_cooked_size - 8) - continue; - - /* Make sure the next relocation applies to the next - instruction and that it's the add3's reloc. */ - nrel = irel + 1; - if (nrel == irelend - || irel->r_offset + 4 != nrel->r_offset - || ELF32_R_TYPE (nrel->r_info) != (int) R_M32R_LO16) - continue; - - /* See if the instructions are seth/add3. */ - /* FIXME: This is where macros from cgen can come in. */ - code = bfd_get_16 (abfd, contents + irel->r_offset + 0); - if ((code & 0xf0ff) != 0xd0c0) - continue; /* not seth rN,foo */ - reg = (code & 0x0f00) >> 8; - code = bfd_get_16 (abfd, contents + irel->r_offset + 4); - if (code != (0x80a0 | reg | (reg << 8))) - continue; /* not add3 rN,rN,foo */ - - /* At this point we've confirmed we have seth/add3. Now check - whether the next insn is a jl, in which case try to change this - to bl24 or bl8. */ - - /* Ensure the branch target is in range. - The bl24 instruction has a 24 bit operand which is the target - address right shifted by 2, giving a signed range of 26 bits. - Note that 4 bytes are added to the high value because the target - will be at least 4 bytes closer if we can relax. It'll actually - be 4 or 8 bytes closer, but we don't know which just yet and - the difference isn't significant enough to worry about. */ -#ifndef USE_REL /* put in for learning purposes */ - pcrel_value += irel->r_addend; -#else - addend = bfd_get_signed_16 (abfd, contents + irel->r_offset + 2); - pcrel_value += addend; -#endif - - if (pcrel_value >= -(1 << 25) && pcrel_value < (1 << 25) + 4 - /* Do nothing if no room in the section for this to be what we're - looking for. */ - && (irel->r_offset <= sec->_cooked_size - 12) - /* Ensure the next insn is "jl rN". */ - && ((code = bfd_get_16 (abfd, contents + irel->r_offset + 8)), - code != (0x1ec0 | reg))) - { - /* We can relax to bl24/bl8. */ - - /* See if there's a nop following the jl. - Also see if we can use a bl8 insn. */ - code = bfd_get_16 (abfd, contents + irel->r_offset + 10); - nop_p = (code & 0x7fff) == NOP_INSN; - bl8_p = pcrel_value >= -0x200 && pcrel_value < 0x200; - - if (bl8_p) - { - /* Change "seth rN,foo" to "bl8 foo || nop". - We OR in CODE just in case it's not a nop (technically, - CODE currently must be a nop, but for cleanness we - allow it to be anything). */ -#ifndef USE_REL /* put in for learning purposes */ - code = 0x7e000000 | MAKE_PARALLEL (code); -#else - code = (0x7e000000 + (((addend >> 2) & 0xff) << 16)) | MAKE_PARALLEL (code); -#endif - to_delete = 8; - } - else - { - /* Change the seth rN,foo to a bl24 foo. */ -#ifndef USE_REL /* put in for learning purposes */ - code = 0xfe000000; -#else - code = 0xfe000000 + ((addend >> 2) & 0xffffff); -#endif - to_delete = nop_p ? 8 : 4; - } - - bfd_put_32 (abfd, code, contents + irel->r_offset); - - /* Set the new reloc type. */ - irel->r_info = ELF32_R_INFO (ELF32_R_SYM (nrel->r_info), - bl8_p ? R_M32R_10_PCREL : R_M32R_26_PCREL); - - /* Delete the add3 reloc by making it a null reloc. */ - nrel->r_info = ELF32_R_INFO (ELF32_R_SYM (nrel->r_info), - R_M32R_NONE); - } - else if (addend >= 0 - && symval + addend <= 0xffffff) - { - /* We can relax to ld24. */ - - code = 0xe0000000 | (reg << 24) | (addend & 0xffffff); - bfd_put_32 (abfd, code, contents + irel->r_offset); - to_delete = 4; - /* Tell the following code a nop filler isn't needed. */ - nop_p = 1; - } - else - { - /* Can't do anything here. */ - continue; - } - - /* Note that we've changed the relocs, section contents, etc. */ - elf_section_data (sec)->relocs = internal_relocs; - free_relocs = NULL; - - elf_section_data (sec)->this_hdr.contents = contents; - free_contents = NULL; - - symtab_hdr->contents = (bfd_byte *) extsyms; - free_extsyms = NULL; - - /* Delete TO_DELETE bytes of data. */ - if (!m32r_elf_relax_delete_bytes (abfd, sec, - irel->r_offset + 4, to_delete)) - goto error_return; - - /* Now that the following bytes have been moved into place, see if - we need to replace the jl with a nop. This happens when we had - to use a bl24 insn and the insn following the jl isn't a nop. - Technically, this situation can't happen (since the insn can - never be executed) but to be clean we do this. When the chip - supports parallel 16 bit insns things may change. - We don't need to do this in the case of relaxing to ld24, - and the above code sets nop_p so this isn't done. */ - if (! nop_p && to_delete == 4) - bfd_put_16 (abfd, NOP_INSN, contents + irel->r_offset + 4); - - /* That will change things, so we should relax again. - Note that this is not required, and it may be slow. */ - *again = true; - - continue; - } - - /* loop to try the next reloc */ - } - - if (free_relocs != NULL) - { - free (free_relocs); - free_relocs = NULL; - } - - if (free_contents != NULL) - { - if (! link_info->keep_memory) - free (free_contents); - else - { - /* Cache the section contents for elf_link_input_bfd. */ - elf_section_data (sec)->this_hdr.contents = contents; - } - free_contents = NULL; - } - - if (free_extsyms != NULL) - { - if (! link_info->keep_memory) - free (free_extsyms); - else - { - /* Cache the symbols for elf_link_input_bfd. */ - symtab_hdr->contents = extsyms; - } - free_extsyms = NULL; - } - - return true; - - error_return: - if (free_relocs != NULL) - free (free_relocs); - if (free_contents != NULL) - free (free_contents); - if (free_extsyms != NULL) - free (free_extsyms); - return false; -} - -/* Delete some bytes from a section while relaxing. */ - -static boolean -m32r_elf_relax_delete_bytes (abfd, sec, addr, count) - bfd *abfd; - asection *sec; - bfd_vma addr; - int count; -{ - Elf_Internal_Shdr *symtab_hdr; - Elf32_External_Sym *extsyms; - int shndx, index; - bfd_byte *contents; - Elf_Internal_Rela *irel, *irelend; - Elf_Internal_Rela *irelalign; - bfd_vma toaddr; - Elf32_External_Sym *esym, *esymend; - struct elf_link_hash_entry *sym_hash; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - extsyms = (Elf32_External_Sym *) symtab_hdr->contents; - - shndx = _bfd_elf_section_from_bfd_section (abfd, sec); - - contents = elf_section_data (sec)->this_hdr.contents; - - /* The deletion must stop at the next ALIGN reloc for an aligment - power larger than the number of bytes we are deleting. */ - - irelalign = NULL; - toaddr = sec->_cooked_size; - - irel = elf_section_data (sec)->relocs; - irelend = irel + sec->reloc_count; - - /* Actually delete the bytes. */ - memmove (contents + addr, contents + addr + count, toaddr - addr - count); - sec->_cooked_size -= count; - - /* Adjust all the relocs. */ - for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) - { - /* Get the new reloc address. */ - if ((irel->r_offset > addr - && irel->r_offset < toaddr)) - irel->r_offset -= count; - } - - /* Adjust the local symbols defined in this section. */ - esym = extsyms; - esymend = esym + symtab_hdr->sh_info; - for (; esym < esymend; esym++) - { - Elf_Internal_Sym isym; - - bfd_elf32_swap_symbol_in (abfd, esym, &isym); - - if (isym.st_shndx == shndx - && isym.st_value > addr - && isym.st_value < toaddr) - { - isym.st_value -= count; - bfd_elf32_swap_symbol_out (abfd, &isym, esym); - } - } - - /* Now adjust the global symbols defined in this section. */ - esym = extsyms + symtab_hdr->sh_info; - esymend = extsyms + (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)); - for (index = 0; esym < esymend; esym++, index++) - { - Elf_Internal_Sym isym; - - bfd_elf32_swap_symbol_in (abfd, esym, &isym); - sym_hash = elf_sym_hashes (abfd)[index]; - if (isym.st_shndx == shndx - && ((sym_hash)->root.type == bfd_link_hash_defined - || (sym_hash)->root.type == bfd_link_hash_defweak) - && (sym_hash)->root.u.def.section == sec - && (sym_hash)->root.u.def.value > addr - && (sym_hash)->root.u.def.value < toaddr) - { - (sym_hash)->root.u.def.value -= count; - } - } - - return true; -} - -/* This is a version of bfd_generic_get_relocated_section_contents - which uses m32r_elf_relocate_section. */ - -static bfd_byte * -m32r_elf_get_relocated_section_contents (output_bfd, link_info, link_order, - data, relocateable, symbols) - bfd *output_bfd; - struct bfd_link_info *link_info; - struct bfd_link_order *link_order; - bfd_byte *data; - boolean relocateable; - asymbol **symbols; -{ - Elf_Internal_Shdr *symtab_hdr; - asection *input_section = link_order->u.indirect.section; - bfd *input_bfd = input_section->owner; - asection **sections = NULL; - Elf_Internal_Rela *internal_relocs = NULL; - Elf32_External_Sym *external_syms = NULL; - Elf_Internal_Sym *internal_syms = NULL; - - /* We only need to handle the case of relaxing, or of having a - particular set of section contents, specially. */ - if (relocateable - || elf_section_data (input_section)->this_hdr.contents == NULL) - return bfd_generic_get_relocated_section_contents (output_bfd, link_info, - link_order, data, - relocateable, - symbols); - - symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; - - memcpy (data, elf_section_data (input_section)->this_hdr.contents, - input_section->_raw_size); - - if ((input_section->flags & SEC_RELOC) != 0 - && input_section->reloc_count > 0) - { - Elf_Internal_Sym *isymp; - asection **secpp; - Elf32_External_Sym *esym, *esymend; - - if (symtab_hdr->contents != NULL) - external_syms = (Elf32_External_Sym *) symtab_hdr->contents; - else - { - external_syms = ((Elf32_External_Sym *) - bfd_malloc (symtab_hdr->sh_info - * sizeof (Elf32_External_Sym))); - if (external_syms == NULL && symtab_hdr->sh_info > 0) - goto error_return; - if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 - || (bfd_read (external_syms, sizeof (Elf32_External_Sym), - symtab_hdr->sh_info, input_bfd) - != (symtab_hdr->sh_info * sizeof (Elf32_External_Sym)))) - goto error_return; - } - - internal_relocs = (_bfd_elf32_link_read_relocs - (input_bfd, input_section, (PTR) NULL, - (Elf_Internal_Rela *) NULL, false)); - if (internal_relocs == NULL) - goto error_return; - - internal_syms = ((Elf_Internal_Sym *) - bfd_malloc (symtab_hdr->sh_info - * sizeof (Elf_Internal_Sym))); - if (internal_syms == NULL && symtab_hdr->sh_info > 0) - goto error_return; - - sections = (asection **) bfd_malloc (symtab_hdr->sh_info - * sizeof (asection *)); - if (sections == NULL && symtab_hdr->sh_info > 0) - goto error_return; - - isymp = internal_syms; - secpp = sections; - esym = external_syms; - esymend = esym + symtab_hdr->sh_info; - for (; esym < esymend; ++esym, ++isymp, ++secpp) - { - asection *isec; - - bfd_elf32_swap_symbol_in (input_bfd, esym, isymp); - - if (isymp->st_shndx == SHN_UNDEF) - isec = bfd_und_section_ptr; - else if (isymp->st_shndx > 0 && isymp->st_shndx < SHN_LORESERVE) - isec = bfd_section_from_elf_index (input_bfd, isymp->st_shndx); - else if (isymp->st_shndx == SHN_ABS) - isec = bfd_abs_section_ptr; - else if (isymp->st_shndx == SHN_COMMON) - isec = bfd_com_section_ptr; - else if (isymp->st_shndx == SHN_M32R_SCOMMON) - isec = &m32r_elf_scom_section; - else - { - /* Who knows? */ - isec = NULL; - } - - *secpp = isec; - } - - if (! m32r_elf_relocate_section (output_bfd, link_info, input_bfd, - input_section, data, internal_relocs, - internal_syms, sections)) - goto error_return; - - if (sections != NULL) - free (sections); - sections = NULL; - if (internal_syms != NULL) - free (internal_syms); - internal_syms = NULL; - if (external_syms != NULL && symtab_hdr->contents == NULL) - free (external_syms); - external_syms = NULL; - if (internal_relocs != elf_section_data (input_section)->relocs) - free (internal_relocs); - internal_relocs = NULL; - } - - return data; - - error_return: - if (internal_relocs != NULL - && internal_relocs != elf_section_data (input_section)->relocs) - free (internal_relocs); - if (external_syms != NULL && symtab_hdr->contents == NULL) - free (external_syms); - if (internal_syms != NULL) - free (internal_syms); - if (sections != NULL) - free (sections); - return NULL; -} - -#endif /* #if 0 */ - -/* Set the right machine number. */ -static boolean -m32r_elf_object_p (abfd) - bfd *abfd; -{ - switch (elf_elfheader (abfd)->e_flags & EF_M32R_ARCH) - { - default: - case E_M32R_ARCH: (void) bfd_default_set_arch_mach (abfd, bfd_arch_m32r, bfd_mach_m32r); break; - case E_M32RX_ARCH: (void) bfd_default_set_arch_mach (abfd, bfd_arch_m32r, bfd_mach_m32rx); break; - } - return true; -} - -/* Store the machine number in the flags field. */ -static void -m32r_elf_final_write_processing (abfd, linker) - bfd * abfd; - boolean linker ATTRIBUTE_UNUSED; -{ - unsigned long val; - - switch (bfd_get_mach (abfd)) - { - default: - case bfd_mach_m32r: val = E_M32R_ARCH; break; - case bfd_mach_m32rx: val = E_M32RX_ARCH; break; - } - - elf_elfheader (abfd)->e_flags &=~ EF_M32R_ARCH; - elf_elfheader (abfd)->e_flags |= val; -} - -/* Function to keep M32R specific file flags. */ -static boolean -m32r_elf_set_private_flags (abfd, 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; -} - -/* Copy backend specific data from one object module to another */ -static boolean -m32r_elf_copy_private_bfd_data (ibfd, obfd) - bfd * ibfd; - bfd * obfd; -{ - if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour - || bfd_get_flavour (obfd) != bfd_target_elf_flavour) - return true; - - BFD_ASSERT (!elf_flags_init (obfd) - || (elf_elfheader (obfd)->e_flags - == elf_elfheader (ibfd)->e_flags)); - - elf_gp (obfd) = elf_gp (ibfd); - elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags; - elf_flags_init (obfd) = true; - return true; -} - -/* Merge backend specific data from an object file to the output - object file when linking. */ -static boolean -m32r_elf_merge_private_bfd_data (ibfd, obfd) - bfd * ibfd; - bfd * obfd; -{ - flagword out_flags; - flagword in_flags; - - if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour - || bfd_get_flavour (obfd) != bfd_target_elf_flavour) - return true; - - in_flags = elf_elfheader (ibfd)->e_flags; - out_flags = elf_elfheader (obfd)->e_flags; - - if (! elf_flags_init (obfd)) - { - /* If the input is the default architecture then do not - bother setting the flags for the output architecture, - instead allow future merges to do this. If no future - merges ever set these flags then they will retain their - unitialised values, which surprise surprise, correspond - to the default values. */ - if (bfd_get_arch_info (ibfd)->the_default) - return true; - - elf_flags_init (obfd) = true; - elf_elfheader (obfd)->e_flags = in_flags; - - 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; - } - - /* Check flag compatibility. */ - if (in_flags == out_flags) - return true; - - if ((in_flags & EF_M32R_ARCH) != (out_flags & EF_M32R_ARCH)) - { - if ((in_flags & EF_M32R_ARCH) != E_M32R_ARCH) - { - _bfd_error_handler (_("%s: Instruction set mismatch with previous modules"), - bfd_get_filename (ibfd)); - - bfd_set_error (bfd_error_bad_value); - return false; - } - } - - return true; -} - -/* Display the flags field */ -static boolean -m32r_elf_print_private_bfd_data (abfd, ptr) - bfd * abfd; - PTR ptr; -{ - FILE * file = (FILE *) ptr; - - BFD_ASSERT (abfd != NULL && ptr != NULL) - - _bfd_elf_print_private_bfd_data (abfd, ptr); - - fprintf (file, _("private flags = %lx"), elf_elfheader (abfd)->e_flags); - - switch (elf_elfheader (abfd)->e_flags & EF_M32R_ARCH) - { - default: - case E_M32R_ARCH: fprintf (file, _(": m32r instructions")); break; - case E_M32RX_ARCH: fprintf (file, _(": m32rx instructions")); break; - } - - fputc ('\n', file); - - return true; -} - -asection * -m32r_elf_gc_mark_hook (abfd, info, rel, h, sym) - bfd *abfd; - struct bfd_link_info *info ATTRIBUTE_UNUSED; - Elf_Internal_Rela *rel; - struct elf_link_hash_entry *h; - Elf_Internal_Sym *sym; -{ - if (h != NULL) - { - switch (ELF32_R_TYPE (rel->r_info)) - { - case R_M32R_GNU_VTINHERIT: - case R_M32R_GNU_VTENTRY: - break; - - default: - switch (h->root.type) - { - case bfd_link_hash_defined: - case bfd_link_hash_defweak: - return h->root.u.def.section; - - case bfd_link_hash_common: - return h->root.u.c.p->section; - - default: - break; - } - } - } - else - { - if (!(elf_bad_symtab (abfd) - && ELF_ST_BIND (sym->st_info) != STB_LOCAL) - && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) - && sym->st_shndx != SHN_COMMON)) - { - return bfd_section_from_elf_index (abfd, sym->st_shndx); - } - } - return NULL; -} - -static boolean -m32r_elf_gc_sweep_hook (abfd, info, sec, relocs) - bfd *abfd ATTRIBUTE_UNUSED; - struct bfd_link_info *info ATTRIBUTE_UNUSED; - asection *sec ATTRIBUTE_UNUSED; - const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; -{ - /* we don't use got and plt entries for m32r */ - return true; -} - -/* Look through the relocs for a section during the first phase. - Since we don't do .gots or .plts, we just need to consider the - virtual table relocs for gc. */ - -static boolean -m32r_elf_check_relocs (abfd, info, sec, relocs) - 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, **sym_hashes_end; - const Elf_Internal_Rela *rel; - const Elf_Internal_Rela *rel_end; - - if (info->relocateable) - return true; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (abfd); - sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym); - if (!elf_bad_symtab (abfd)) - sym_hashes_end -= symtab_hdr->sh_info; - - rel_end = relocs + sec->reloc_count; - for (rel = relocs; rel < rel_end; rel++) - { - struct elf_link_hash_entry *h; - unsigned long r_symndx; - - 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]; - - switch (ELF32_R_TYPE (rel->r_info)) - { - /* This relocation describes the C++ object vtable hierarchy. - Reconstruct it for later use during GC. */ - case R_M32R_GNU_VTINHERIT: - if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) - return false; - break; - - /* This relocation describes which C++ vtable entries are actually - used. Record for later use during GC. */ - case R_M32R_GNU_VTENTRY: - if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset)) - return false; - break; - } - } - - return true; -} - -#define ELF_ARCH bfd_arch_m32r -#define ELF_MACHINE_CODE EM_CYGNUS_M32R -#define ELF_MAXPAGESIZE 0x1 /* Explicitly requested by Mitsubishi. */ - -#define TARGET_BIG_SYM bfd_elf32_m32r_vec -#define TARGET_BIG_NAME "elf32-m32r" - -#define elf_info_to_howto 0 -#define elf_info_to_howto_rel m32r_info_to_howto_rel -#define elf_backend_section_from_bfd_section _bfd_m32r_elf_section_from_bfd_section -#define elf_backend_symbol_processing _bfd_m32r_elf_symbol_processing -#define elf_backend_add_symbol_hook m32r_elf_add_symbol_hook -#define elf_backend_relocate_section m32r_elf_relocate_section -#define elf_backend_gc_mark_hook m32r_elf_gc_mark_hook -#define elf_backend_gc_sweep_hook m32r_elf_gc_sweep_hook -#define elf_backend_check_relocs m32r_elf_check_relocs - -#define elf_backend_can_gc_sections 1 -#if 0 /* not yet */ -/* relax support */ -#define bfd_elf32_bfd_relax_section m32r_elf_relax_section -#define bfd_elf32_bfd_get_relocated_section_contents \ - m32r_elf_get_relocated_section_contents -#endif - -#define elf_backend_object_p m32r_elf_object_p -#define elf_backend_final_write_processing m32r_elf_final_write_processing -#define bfd_elf32_bfd_copy_private_bfd_data m32r_elf_copy_private_bfd_data -#define bfd_elf32_bfd_merge_private_bfd_data m32r_elf_merge_private_bfd_data -#define bfd_elf32_bfd_set_private_flags m32r_elf_set_private_flags -#define bfd_elf32_bfd_print_private_bfd_data m32r_elf_print_private_bfd_data - -#include "elf32-target.h" |