diff options
Diffstat (limited to 'bfd/elf32-m68k.c')
| -rw-r--r-- | bfd/elf32-m68k.c | 2128 |
1 files changed, 2128 insertions, 0 deletions
diff --git a/bfd/elf32-m68k.c b/bfd/elf32-m68k.c new file mode 100644 index 00000000000..2d0aba210fb --- /dev/null +++ b/bfd/elf32-m68k.c @@ -0,0 +1,2128 @@ +/* Motorola 68k series support for 32-bit ELF + Copyright 1993, 95, 96, 97, 98, 1999 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 "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/m68k.h" + +static reloc_howto_type *reloc_type_lookup + PARAMS ((bfd *, bfd_reloc_code_real_type)); +static void rtype_to_howto + PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *)); +static struct bfd_hash_entry *elf_m68k_link_hash_newfunc + PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); +static struct bfd_link_hash_table *elf_m68k_link_hash_table_create + PARAMS ((bfd *)); +static boolean elf_m68k_check_relocs + PARAMS ((bfd *, struct bfd_link_info *, asection *, + const Elf_Internal_Rela *)); +static asection *elf_m68k_gc_mark_hook + PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, + struct elf_link_hash_entry *, Elf_Internal_Sym *)); +static boolean elf_m68k_gc_sweep_hook + PARAMS ((bfd *, struct bfd_link_info *, asection *, + const Elf_Internal_Rela *)); +static boolean elf_m68k_adjust_dynamic_symbol + PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); +static boolean elf_m68k_adjust_dynindx + PARAMS ((struct elf_link_hash_entry *, PTR)); +static boolean elf_m68k_size_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); +static boolean elf_m68k_relocate_section + PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, + Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); +static boolean elf_m68k_finish_dynamic_symbol + PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, + Elf_Internal_Sym *)); +static boolean elf_m68k_finish_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); + +static reloc_howto_type howto_table[] = { + HOWTO(R_68K_NONE, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_NONE", false, 0, 0x00000000,false), + HOWTO(R_68K_32, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32", false, 0, 0xffffffff,false), + HOWTO(R_68K_16, 0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16", false, 0, 0x0000ffff,false), + HOWTO(R_68K_8, 0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8", false, 0, 0x000000ff,false), + HOWTO(R_68K_PC32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PC32", false, 0, 0xffffffff,true), + HOWTO(R_68K_PC16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC16", false, 0, 0x0000ffff,true), + HOWTO(R_68K_PC8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PC8", false, 0, 0x000000ff,true), + HOWTO(R_68K_GOT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32", false, 0, 0xffffffff,true), + HOWTO(R_68K_GOT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16", false, 0, 0x0000ffff,true), + HOWTO(R_68K_GOT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8", false, 0, 0x000000ff,true), + HOWTO(R_68K_GOT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_GOT32O", false, 0, 0xffffffff,false), + HOWTO(R_68K_GOT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT16O", false, 0, 0x0000ffff,false), + HOWTO(R_68K_GOT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_GOT8O", false, 0, 0x000000ff,false), + HOWTO(R_68K_PLT32, 0, 2,32, true, 0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32", false, 0, 0xffffffff,true), + HOWTO(R_68K_PLT16, 0, 1,16, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16", false, 0, 0x0000ffff,true), + HOWTO(R_68K_PLT8, 0, 0, 8, true, 0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8", false, 0, 0x000000ff,true), + HOWTO(R_68K_PLT32O, 0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_PLT32O", false, 0, 0xffffffff,false), + HOWTO(R_68K_PLT16O, 0, 1,16, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT16O", false, 0, 0x0000ffff,false), + HOWTO(R_68K_PLT8O, 0, 0, 8, false,0, complain_overflow_signed, bfd_elf_generic_reloc, "R_68K_PLT8O", false, 0, 0x000000ff,false), + HOWTO(R_68K_COPY, 0, 0, 0, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_COPY", false, 0, 0xffffffff,false), + HOWTO(R_68K_GLOB_DAT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_GLOB_DAT", false, 0, 0xffffffff,false), + HOWTO(R_68K_JMP_SLOT, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_JMP_SLOT", false, 0, 0xffffffff,false), + HOWTO(R_68K_RELATIVE, 0, 2,32, false,0, complain_overflow_dont, bfd_elf_generic_reloc, "R_68K_RELATIVE", false, 0, 0xffffffff,false), + /* GNU extension to record C++ vtable hierarchy */ + HOWTO (R_68K_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_68K_GNU_VTINHERIT", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), + /* GNU extension to record C++ vtable member usage */ + HOWTO (R_68K_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_68K_GNU_VTENTRY", /* name */ + false, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + false), +}; + +static void +rtype_to_howto (abfd, cache_ptr, dst) + bfd *abfd; + arelent *cache_ptr; + Elf_Internal_Rela *dst; +{ + BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K_max); + cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)]; +} + +#define elf_info_to_howto rtype_to_howto + +static const struct +{ + bfd_reloc_code_real_type bfd_val; + int elf_val; +} reloc_map[] = { + { BFD_RELOC_NONE, R_68K_NONE }, + { BFD_RELOC_32, R_68K_32 }, + { BFD_RELOC_16, R_68K_16 }, + { BFD_RELOC_8, R_68K_8 }, + { BFD_RELOC_32_PCREL, R_68K_PC32 }, + { BFD_RELOC_16_PCREL, R_68K_PC16 }, + { BFD_RELOC_8_PCREL, R_68K_PC8 }, + { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 }, + { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 }, + { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 }, + { BFD_RELOC_32_GOTOFF, R_68K_GOT32O }, + { BFD_RELOC_16_GOTOFF, R_68K_GOT16O }, + { BFD_RELOC_8_GOTOFF, R_68K_GOT8O }, + { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 }, + { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 }, + { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 }, + { BFD_RELOC_32_PLTOFF, R_68K_PLT32O }, + { BFD_RELOC_16_PLTOFF, R_68K_PLT16O }, + { BFD_RELOC_8_PLTOFF, R_68K_PLT8O }, + { BFD_RELOC_NONE, R_68K_COPY }, + { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT }, + { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT }, + { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE }, + { BFD_RELOC_CTOR, R_68K_32 }, + { BFD_RELOC_VTABLE_INHERIT, R_68K_GNU_VTINHERIT }, + { BFD_RELOC_VTABLE_ENTRY, R_68K_GNU_VTENTRY }, +}; + +static reloc_howto_type * +reloc_type_lookup (abfd, code) + bfd *abfd; + bfd_reloc_code_real_type code; +{ + unsigned int i; + for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++) + { + if (reloc_map[i].bfd_val == code) + return &howto_table[reloc_map[i].elf_val]; + } + return 0; +} + +#define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup +#define ELF_ARCH bfd_arch_m68k +/* end code generated by elf.el */ + +#define USE_RELA + + +/* Functions for the m68k ELF linker. */ + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1" + +/* The size in bytes of an entry in the procedure linkage table. */ + +#define PLT_ENTRY_SIZE 20 + +/* The first entry in a procedure linkage table looks like this. See + the SVR4 ABI m68k supplement to see how this works. */ + +static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] = +{ + 0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */ + 0, 0, 0, 0, /* replaced with offset to .got + 4. */ + 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */ + 0, 0, 0, 0, /* replaced with offset to .got + 8. */ + 0, 0, 0, 0 /* pad out to 20 bytes. */ +}; + +/* Subsequent entries in a procedure linkage table look like this. */ + +static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] = +{ + 0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */ + 0, 0, 0, 0, /* replaced with offset to symbol's .got entry. */ + 0x2f, 0x3c, /* move.l #offset,-(%sp) */ + 0, 0, 0, 0, /* replaced with offset into relocation table. */ + 0x60, 0xff, /* bra.l .plt */ + 0, 0, 0, 0 /* replaced with offset to start of .plt. */ +}; + +/* The m68k linker needs to keep track of the number of relocs that it + decides to copy in check_relocs for each symbol. This is so that it + can discard PC relative relocs if it doesn't need them when linking + with -Bsymbolic. We store the information in a field extending the + regular ELF linker hash table. */ + +/* This structure keeps track of the number of PC relative relocs we have + copied for a given symbol. */ + +struct elf_m68k_pcrel_relocs_copied +{ + /* Next section. */ + struct elf_m68k_pcrel_relocs_copied *next; + /* A section in dynobj. */ + asection *section; + /* Number of relocs copied in this section. */ + bfd_size_type count; +}; + +/* m68k ELF linker hash entry. */ + +struct elf_m68k_link_hash_entry +{ + struct elf_link_hash_entry root; + + /* Number of PC relative relocs copied for this symbol. */ + struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied; +}; + +/* m68k ELF linker hash table. */ + +struct elf_m68k_link_hash_table +{ + struct elf_link_hash_table root; +}; + +/* Declare this now that the above structures are defined. */ + +static boolean elf_m68k_discard_copies + PARAMS ((struct elf_m68k_link_hash_entry *, PTR)); + +/* Traverse an m68k ELF linker hash table. */ + +#define elf_m68k_link_hash_traverse(table, func, info) \ + (elf_link_hash_traverse \ + (&(table)->root, \ + (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ + (info))) + +/* Get the m68k ELF linker hash table from a link_info structure. */ + +#define elf_m68k_hash_table(p) \ + ((struct elf_m68k_link_hash_table *) (p)->hash) + +/* Create an entry in an m68k ELF linker hash table. */ + +static struct bfd_hash_entry * +elf_m68k_link_hash_newfunc (entry, table, string) + struct bfd_hash_entry *entry; + struct bfd_hash_table *table; + const char *string; +{ + struct elf_m68k_link_hash_entry *ret = + (struct elf_m68k_link_hash_entry *) entry; + + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (ret == (struct elf_m68k_link_hash_entry *) NULL) + ret = ((struct elf_m68k_link_hash_entry *) + bfd_hash_allocate (table, + sizeof (struct elf_m68k_link_hash_entry))); + if (ret == (struct elf_m68k_link_hash_entry *) NULL) + return (struct bfd_hash_entry *) ret; + + /* Call the allocation method of the superclass. */ + ret = ((struct elf_m68k_link_hash_entry *) + _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, + table, string)); + if (ret != (struct elf_m68k_link_hash_entry *) NULL) + { + ret->pcrel_relocs_copied = NULL; + } + + return (struct bfd_hash_entry *) ret; +} + +/* Create an m68k ELF linker hash table. */ + +static struct bfd_link_hash_table * +elf_m68k_link_hash_table_create (abfd) + bfd *abfd; +{ + struct elf_m68k_link_hash_table *ret; + + ret = ((struct elf_m68k_link_hash_table *) + bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table))); + if (ret == (struct elf_m68k_link_hash_table *) NULL) + return NULL; + + if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, + elf_m68k_link_hash_newfunc)) + { + bfd_release (abfd, ret); + return NULL; + } + + return &ret->root.root; +} + +/* Look through the relocs for a section during the first phase, and + allocate space in the global offset table or procedure linkage + table. */ + +static boolean +elf_m68k_check_relocs (abfd, info, sec, relocs) + bfd *abfd; + struct bfd_link_info *info; + asection *sec; + const Elf_Internal_Rela *relocs; +{ + bfd *dynobj; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + bfd_signed_vma *local_got_refcounts; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + asection *sgot; + asection *srelgot; + asection *sreloc; + + if (info->relocateable) + return true; + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + local_got_refcounts = elf_local_got_refcounts (abfd); + + sgot = NULL; + srelgot = NULL; + sreloc = NULL; + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + unsigned long r_symndx; + struct elf_link_hash_entry *h; + + 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)) + { + case R_68K_GOT8: + case R_68K_GOT16: + case R_68K_GOT32: + if (h != NULL + && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) + break; + /* Fall through. */ + case R_68K_GOT8O: + case R_68K_GOT16O: + case R_68K_GOT32O: + /* This symbol requires a global offset table entry. */ + + if (dynobj == NULL) + { + /* Create the .got section. */ + elf_hash_table (info)->dynobj = dynobj = abfd; + if (!_bfd_elf_create_got_section (dynobj, info)) + return false; + } + + if (sgot == NULL) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + if (srelgot == NULL + && (h != NULL || info->shared)) + { + srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); + if (srelgot == NULL) + { + srelgot = bfd_make_section (dynobj, ".rela.got"); + if (srelgot == NULL + || !bfd_set_section_flags (dynobj, srelgot, + (SEC_ALLOC + | SEC_LOAD + | SEC_HAS_CONTENTS + | SEC_IN_MEMORY + | SEC_LINKER_CREATED + | SEC_READONLY)) + || !bfd_set_section_alignment (dynobj, srelgot, 2)) + return false; + } + } + + if (h != NULL) + { + if (h->got.refcount == -1) + { + h->got.refcount = 1; + + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + { + if (!bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + } + + /* Allocate space in the .got section. */ + sgot->_raw_size += 4; + /* Allocate relocation space. */ + srelgot->_raw_size += sizeof (Elf32_External_Rela); + } + else + h->got.refcount++; + } + else + { + /* This is a global offset table entry for a local symbol. */ + if (local_got_refcounts == NULL) + { + size_t size; + + size = symtab_hdr->sh_info * sizeof (bfd_signed_vma); + local_got_refcounts = ((bfd_signed_vma *) + bfd_alloc (abfd, size)); + if (local_got_refcounts == NULL) + return false; + elf_local_got_refcounts (abfd) = local_got_refcounts; + memset (local_got_refcounts, -1, size); + } + if (local_got_refcounts[r_symndx] == -1) + { + local_got_refcounts[r_symndx] = 1; + + sgot->_raw_size += 4; + if (info->shared) + { + /* If we are generating a shared object, we need to + output a R_68K_RELATIVE reloc so that the dynamic + linker can adjust this GOT entry. */ + srelgot->_raw_size += sizeof (Elf32_External_Rela); + } + } + else + local_got_refcounts[r_symndx]++; + } + break; + + case R_68K_PLT8: + case R_68K_PLT16: + case R_68K_PLT32: + /* This symbol requires a procedure linkage table entry. We + actually build the entry in adjust_dynamic_symbol, + because this might be a case of linking PIC code which is + never referenced by a dynamic object, in which case we + don't need to generate a procedure linkage table entry + after all. */ + + /* If this is a local symbol, we resolve it directly without + creating a procedure linkage table entry. */ + if (h == NULL) + continue; + + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + if (h->plt.refcount == -1) + h->plt.refcount = 1; + else + h->plt.refcount++; + break; + + case R_68K_PLT8O: + case R_68K_PLT16O: + case R_68K_PLT32O: + /* This symbol requires a procedure linkage table entry. */ + + if (h == NULL) + { + /* It does not make sense to have this relocation for a + local symbol. FIXME: does it? How to handle it if + it does make sense? */ + bfd_set_error (bfd_error_bad_value); + return false; + } + + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + { + if (!bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + } + + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + if (h->plt.refcount == -1) + h->plt.refcount = 1; + else + h->plt.refcount++; + break; + + case R_68K_PC8: + case R_68K_PC16: + case R_68K_PC32: + /* If we are creating a shared library and this is not a local + symbol, we need to copy the reloc into the shared library. + However when linking with -Bsymbolic and this is a global + symbol which is defined in an object we are including in the + link (i.e., DEF_REGULAR is set), then we can resolve the + reloc directly. At this point we have not seen all the input + files, so it is possible that DEF_REGULAR is not set now but + will be set later (it is never cleared). We account for that + possibility below by storing information in the + pcrel_relocs_copied field of the hash table entry. */ + if (!(info->shared + && (sec->flags & SEC_ALLOC) != 0 + && h != NULL + && (!info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0))) + { + if (h != NULL) + { + /* Make sure a plt entry is created for this symbol if + it turns out to be a function defined by a dynamic + object. */ + if (h->plt.refcount == -1) + h->plt.refcount = 1; + else + h->plt.refcount++; + } + break; + } + /* Fall through. */ + case R_68K_8: + case R_68K_16: + case R_68K_32: + if (h != NULL) + { + /* Make sure a plt entry is created for this symbol if it + turns out to be a function defined by a dynamic object. */ + if (h->plt.refcount == -1) + h->plt.refcount = 1; + else + h->plt.refcount++; + } + + /* If we are creating a shared library, we need to copy the + reloc into the shared library. */ + if (info->shared + && (sec->flags & SEC_ALLOC) != 0) + { + /* When creating a shared object, we must copy these + reloc types into the output file. We create a reloc + section in dynobj and make room for this reloc. */ + if (sreloc == NULL) + { + const char *name; + + name = (bfd_elf_string_from_elf_section + (abfd, + elf_elfheader (abfd)->e_shstrndx, + elf_section_data (sec)->rel_hdr.sh_name)); + if (name == NULL) + return false; + + BFD_ASSERT (strncmp (name, ".rela", 5) == 0 + && strcmp (bfd_get_section_name (abfd, sec), + name + 5) == 0); + + sreloc = bfd_get_section_by_name (dynobj, name); + if (sreloc == NULL) + { + sreloc = bfd_make_section (dynobj, name); + if (sreloc == NULL + || !bfd_set_section_flags (dynobj, sreloc, + (SEC_ALLOC + | SEC_LOAD + | SEC_HAS_CONTENTS + | SEC_IN_MEMORY + | SEC_LINKER_CREATED + | SEC_READONLY)) + || !bfd_set_section_alignment (dynobj, sreloc, 2)) + return false; + } + } + + sreloc->_raw_size += sizeof (Elf32_External_Rela); + + /* If we are linking with -Bsymbolic, we count the number of + PC relative relocations we have entered for this symbol, + so that we can discard them again if the symbol is later + defined by a regular object. Note that this function is + only called if we are using an m68kelf linker hash table, + which means that h is really a pointer to an + elf_m68k_link_hash_entry. */ + if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8 + || ELF32_R_TYPE (rel->r_info) == R_68K_PC16 + || ELF32_R_TYPE (rel->r_info) == R_68K_PC32) + && info->symbolic) + { + struct elf_m68k_link_hash_entry *eh; + struct elf_m68k_pcrel_relocs_copied *p; + + eh = (struct elf_m68k_link_hash_entry *) h; + + for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) + if (p->section == sreloc) + break; + + if (p == NULL) + { + p = ((struct elf_m68k_pcrel_relocs_copied *) + bfd_alloc (dynobj, sizeof *p)); + if (p == NULL) + return false; + p->next = eh->pcrel_relocs_copied; + eh->pcrel_relocs_copied = p; + p->section = sreloc; + p->count = 0; + } + + ++p->count; + } + } + + break; + + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + case R_68K_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_68K_GNU_VTENTRY: + if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return false; + break; + + default: + break; + } + } + + return true; +} + +/* Return the section that should be marked against GC for a given + relocation. */ + +static asection * +elf_m68k_gc_mark_hook (abfd, info, rel, h, sym) + bfd *abfd; + struct bfd_link_info *info; + 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_68K_GNU_VTINHERIT: + case R_68K_GNU_VTENTRY: + break; + + default: + switch (h->root.type) + { + default: + break; + + 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; + } + } + } + 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; +} + +/* Update the got entry reference counts for the section being removed. */ + +static boolean +elf_m68k_gc_sweep_hook (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; + bfd_signed_vma *local_got_refcounts; + const Elf_Internal_Rela *rel, *relend; + unsigned long r_symndx; + struct elf_link_hash_entry *h; + bfd *dynobj; + asection *sgot; + asection *srelgot; + + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + local_got_refcounts = elf_local_got_refcounts (abfd); + + dynobj = elf_hash_table (info)->dynobj; + if (dynobj) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); + } + + relend = relocs + sec->reloc_count; + for (rel = relocs; rel < relend; rel++) + { + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_68K_GOT8: + case R_68K_GOT16: + case R_68K_GOT32: + case R_68K_GOT8O: + case R_68K_GOT16O: + case R_68K_GOT32O: + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + if (h->got.refcount > 0) + { + --h->got.refcount; + if (h->got.refcount == 0) + { + /* We don't need the .got entry any more. */ + sgot->_raw_size -= 4; + srelgot->_raw_size -= sizeof (Elf32_External_Rela); + } + } + } + else + { + if (local_got_refcounts[r_symndx] > 0) + { + --local_got_refcounts[r_symndx]; + if (local_got_refcounts[r_symndx] == 0) + { + /* We don't need the .got entry any more. */ + sgot->_raw_size -= 4; + if (info->shared) + srelgot->_raw_size -= sizeof (Elf32_External_Rela); + } + } + } + break; + + case R_68K_PLT8: + case R_68K_PLT16: + case R_68K_PLT32: + case R_68K_PLT8O: + case R_68K_PLT16O: + case R_68K_PLT32O: + case R_68K_PC8: + case R_68K_PC16: + case R_68K_PC32: + case R_68K_8: + case R_68K_16: + case R_68K_32: + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + if (h->plt.refcount > 0) + --h->plt.refcount; + } + break; + + default: + break; + } + } + + 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 boolean +elf_m68k_adjust_dynamic_symbol (info, h) + struct bfd_link_info *info; + struct elf_link_hash_entry *h; +{ + bfd *dynobj; + asection *s; + unsigned int power_of_two; + + dynobj = elf_hash_table (info)->dynobj; + + /* Make sure we know what is going on here. */ + BFD_ASSERT (dynobj != NULL + && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) + || h->weakdef != NULL + || ((h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + && (h->elf_link_hash_flags + & ELF_LINK_HASH_REF_REGULAR) != 0 + && (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0))); + + /* If this is a function, put it in the procedure linkage table. We + will fill in the contents of the procedure linkage table later, + when we know the address of the .got section. */ + if (h->type == STT_FUNC + || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) + { + if (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 + /* We must always create the plt entry if it was referenced + by a PLTxxO relocation. In this case we already recorded + it as a dynamic symbol. */ + && h->dynindx == -1) + { + /* This case can occur if we saw a PLTxx reloc in an input + file, but the symbol was never referred to by a dynamic + object. In such a case, we don't actually need to build + a procedure linkage table, and we can just do a PCxx + reloc instead. */ + BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); + h->plt.offset = (bfd_vma) -1; + return true; + } + + /* GC may have rendered this entry unused. */ + if (h->plt.refcount <= 0) + { + h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; + h->plt.offset = (bfd_vma) -1; + return true; + } + + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + { + if (! bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + } + + s = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (s != NULL); + + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->_raw_size == 0) + s->_raw_size += PLT_ENTRY_SIZE; + + /* If this symbol is not defined in a regular file, and we are + not generating a shared library, then set the symbol to this + location in the .plt. This is required to make function + pointers compare as equal between the normal executable and + the shared library. */ + if (!info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + { + h->root.u.def.section = s; + h->root.u.def.value = s->_raw_size; + } + + h->plt.offset = s->_raw_size; + + /* Make room for this entry. */ + s->_raw_size += PLT_ENTRY_SIZE; + + /* We also need to make an entry in the .got.plt section, which + will be placed in the .got section by the linker script. */ + + s = bfd_get_section_by_name (dynobj, ".got.plt"); + BFD_ASSERT (s != NULL); + s->_raw_size += 4; + + /* We also need to make an entry in the .rela.plt section. */ + + s = bfd_get_section_by_name (dynobj, ".rela.plt"); + BFD_ASSERT (s != NULL); + s->_raw_size += sizeof (Elf32_External_Rela); + + return true; + } + + /* Reinitialize the plt offset now that it is not used as a reference + count any more. */ + h->plt.offset = (bfd_vma) -1; + + /* 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->weakdef != NULL) + { + BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined + || h->weakdef->root.type == bfd_link_hash_defweak); + h->root.u.def.section = h->weakdef->root.u.def.section; + h->root.u.def.value = h->weakdef->root.u.def.value; + return true; + } + + /* This is a reference to a symbol defined by a dynamic object which + is not a function. */ + + /* If we are creating a shared library, we must presume that the + only references to the symbol are via the global offset table. + For such cases we need not do anything here; the relocations will + be handled correctly by relocate_section. */ + if (info->shared) + return true; + + /* We must allocate the symbol in our .dynbss section, which will + become part of the .bss section of the executable. There will be + an entry for this symbol in the .dynsym section. The dynamic + object will contain position independent code, so all references + from the dynamic object to this symbol will go through the global + offset table. The dynamic linker will use the .dynsym entry to + determine the address it must put in the global offset table, so + both the dynamic object and the regular object will refer to the + same memory location for the variable. */ + + s = bfd_get_section_by_name (dynobj, ".dynbss"); + BFD_ASSERT (s != NULL); + + /* We must generate a R_68K_COPY reloc to tell the dynamic linker to + copy the initial value out of the dynamic object and into the + runtime process image. We need to remember the offset into the + .rela.bss section we are going to use. */ + if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) + { + asection *srel; + + srel = bfd_get_section_by_name (dynobj, ".rela.bss"); + BFD_ASSERT (srel != NULL); + srel->_raw_size += sizeof (Elf32_External_Rela); + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; + } + + /* We need to figure out the alignment required for this symbol. I + have no idea how ELF linkers handle this. */ + power_of_two = bfd_log2 (h->size); + if (power_of_two > 3) + power_of_two = 3; + + /* Apply the required alignment. */ + s->_raw_size = BFD_ALIGN (s->_raw_size, + (bfd_size_type) (1 << power_of_two)); + if (power_of_two > bfd_get_section_alignment (dynobj, s)) + { + if (!bfd_set_section_alignment (dynobj, s, power_of_two)) + return false; + } + + /* Define the symbol as being at this point in the section. */ + h->root.u.def.section = s; + h->root.u.def.value = s->_raw_size; + + /* Increment the section size to make room for the symbol. */ + s->_raw_size += h->size; + + return true; +} + +/* Set the sizes of the dynamic sections. */ + +static boolean +elf_m68k_size_dynamic_sections (output_bfd, info) + bfd *output_bfd; + struct bfd_link_info *info; +{ + bfd *dynobj; + asection *s; + boolean plt; + boolean relocs; + boolean reltext; + + dynobj = elf_hash_table (info)->dynobj; + BFD_ASSERT (dynobj != NULL); + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (!info->shared) + { + s = bfd_get_section_by_name (dynobj, ".interp"); + BFD_ASSERT (s != NULL); + s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + } + else + { + /* We may have created entries in the .rela.got section. + However, if we are not creating the dynamic sections, we will + not actually use these entries. Reset the size of .rela.got, + which will cause it to get stripped from the output file + below. */ + s = bfd_get_section_by_name (dynobj, ".rela.got"); + if (s != NULL) + s->_raw_size = 0; + } + + /* If this is a -Bsymbolic shared link, then we need to discard all PC + relative relocs against symbols defined in a regular object. We + allocated space for them in the check_relocs routine, but we will not + fill them in in the relocate_section routine. */ + if (info->shared && info->symbolic) + elf_m68k_link_hash_traverse (elf_m68k_hash_table (info), + elf_m68k_discard_copies, + (PTR) NULL); + + /* The check_relocs and adjust_dynamic_symbol entry points have + determined the sizes of the various dynamic sections. Allocate + memory for them. */ + plt = false; + relocs = false; + reltext = false; + for (s = dynobj->sections; s != NULL; s = s->next) + { + const char *name; + boolean strip; + + 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); + + strip = false; + + if (strcmp (name, ".plt") == 0) + { + if (s->_raw_size == 0) + { + /* Strip this section if we don't need it; see the + comment below. */ + strip = true; + } + else + { + /* Remember whether there is a PLT. */ + plt = true; + } + } + else if (strncmp (name, ".rela", 5) == 0) + { + if (s->_raw_size == 0) + { + /* If we don't need this section, strip it from the + output file. This is mostly to handle .rela.bss and + .rela.plt. We must create both sections in + create_dynamic_sections, because they must be created + before the linker maps input sections to output + sections. The linker does that before + adjust_dynamic_symbol is called, and it is that + function which decides whether anything needs to go + into these sections. */ + strip = true; + } + else + { + asection *target; + + /* Remember whether there are any reloc sections other + than .rela.plt. */ + if (strcmp (name, ".rela.plt") != 0) + { + const char *outname; + + relocs = true; + + /* If this relocation section applies to a read only + section, then we probably need a DT_TEXTREL + entry. .rela.plt is actually associated with + .got.plt, which is never readonly. */ + outname = bfd_get_section_name (output_bfd, + s->output_section); + target = bfd_get_section_by_name (output_bfd, outname + 5); + if (target != NULL + && (target->flags & SEC_READONLY) != 0 + && (target->flags & SEC_ALLOC) != 0) + reltext = 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 (strncmp (name, ".got", 4) != 0) + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + if (strip) + { + _bfd_strip_section_from_output (s); + continue; + } + + /* Allocate memory for the section contents. */ + s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size); + if (s->contents == NULL && s->_raw_size != 0) + return false; + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Add some entries to the .dynamic section. We fill in the + values later, in elf_m68k_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. */ + if (!info->shared) + { + if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) + return false; + } + + if (plt) + { + if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) + || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) + || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA) + || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) + return false; + } + + if (relocs) + { + if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0) + || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0) + || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT, + sizeof (Elf32_External_Rela))) + return false; + } + + if (reltext) + { + if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) + return false; + } + } + + /* If we are generating a shared library, we generate a section + symbol for each output section for which we might need to copy + relocs. These are local symbols, which means that they must come + first in the dynamic symbol table. That means we must increment + the dynamic symbol index of every other dynamic symbol. */ + if (info->shared) + { + int c; + + c = 0; + for (s = output_bfd->sections; s != NULL; s = s->next) + { + if ((s->flags & SEC_LINKER_CREATED) != 0 + || (s->flags & SEC_ALLOC) == 0) + continue; + + elf_section_data (s)->dynindx = c + 1; + + /* These symbols will have no names, so we don't need to + fiddle with dynstr_index. */ + + ++c; + } + + elf_link_hash_traverse (elf_hash_table (info), + elf_m68k_adjust_dynindx, + (PTR) &c); + elf_hash_table (info)->dynsymcount += c; + } + + return true; +} + +/* Increment the index of a dynamic symbol by a given amount. Called + via elf_link_hash_traverse. */ + +static boolean +elf_m68k_adjust_dynindx (h, cparg) + struct elf_link_hash_entry *h; + PTR cparg; +{ + int *cp = (int *) cparg; + + if (h->dynindx != -1) + h->dynindx += *cp; + return true; +} + +/* This function is called via elf_m68k_link_hash_traverse if we are + creating a shared object with -Bsymbolic. It discards the space + allocated to copy PC relative relocs against symbols which are defined + in regular objects. We allocated space for them in the check_relocs + routine, but we won't fill them in in the relocate_section routine. */ + +/*ARGSUSED*/ +static boolean +elf_m68k_discard_copies (h, ignore) + struct elf_m68k_link_hash_entry *h; + PTR ignore; +{ + struct elf_m68k_pcrel_relocs_copied *s; + + /* We only discard relocs for symbols defined in a regular object. */ + if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + return true; + + for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) + s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela); + + return true; +} + +/* Relocate an M68K ELF section. */ + +static boolean +elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section, + contents, relocs, local_syms, local_sections) + 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; +{ + bfd *dynobj; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + bfd_vma *local_got_offsets; + asection *sgot; + asection *splt; + asection *sreloc; + Elf_Internal_Rela *rel; + Elf_Internal_Rela *relend; + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + local_got_offsets = elf_local_got_offsets (input_bfd); + + sgot = NULL; + splt = NULL; + sreloc = NULL; + + 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; + asection *sec; + bfd_vma relocation; + bfd_reloc_status_type r; + + r_type = ELF32_R_TYPE (rel->r_info); + if (r_type < 0 || r_type >= (int) R_68K_max) + { + bfd_set_error (bfd_error_bad_value); + return false; + } + howto = 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. */ + 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; + } + } + + continue; + } + + /* This is a final link. */ + h = NULL; + sym = NULL; + sec = NULL; + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = (sec->output_section->vma + + sec->output_offset + + sym->st_value); + } + else + { + 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; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + if (((r_type == R_68K_PLT8 + || r_type == R_68K_PLT16 + || r_type == R_68K_PLT32 + || r_type == R_68K_PLT8O + || r_type == R_68K_PLT16O + || r_type == R_68K_PLT32O) + && h->plt.offset != (bfd_vma) -1 + && elf_hash_table (info)->dynamic_sections_created) + || ((r_type == R_68K_GOT8O + || r_type == R_68K_GOT16O + || r_type == R_68K_GOT32O + || ((r_type == R_68K_GOT8 + || r_type == R_68K_GOT16 + || r_type == R_68K_GOT32) + && strcmp (h->root.root.string, + "_GLOBAL_OFFSET_TABLE_") != 0)) + && elf_hash_table (info)->dynamic_sections_created + && (! info->shared + || (! info->symbolic && h->dynindx != -1) + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)) + || (info->shared + && ((! info->symbolic && h->dynindx != -1) + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0) + && (input_section->flags & SEC_ALLOC) != 0 + && (r_type == R_68K_8 + || r_type == R_68K_16 + || r_type == R_68K_32 + || r_type == R_68K_PC8 + || r_type == R_68K_PC16 + || r_type == R_68K_PC32))) + { + /* In these cases, we don't need the relocation + value. We check specially because in some + obscure cases sec->output_section will be 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->shared && !info->symbolic && !info->no_undefined) + relocation = 0; + else + { + if (!(info->callbacks->undefined_symbol + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset))) + return false; + relocation = 0; + } + } + + switch (r_type) + { + case R_68K_GOT8: + case R_68K_GOT16: + case R_68K_GOT32: + /* Relocation is to the address of the entry for this symbol + in the global offset table. */ + if (h != NULL + && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) + break; + /* Fall through. */ + case R_68K_GOT8O: + case R_68K_GOT16O: + case R_68K_GOT32O: + /* Relocation is the offset of the entry for this symbol in + the global offset table. */ + + { + bfd_vma off; + + if (sgot == NULL) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + if (h != NULL) + { + off = h->got.offset; + BFD_ASSERT (off != (bfd_vma) -1); + + if (!elf_hash_table (info)->dynamic_sections_created + || (info->shared + && (info->symbolic || h->dynindx == -1) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) + { + /* This is actually a static link, or it is a + -Bsymbolic link and the symbol is defined + locally, or the symbol was forced to be local + because of a version file.. We must initialize + this entry in the global offset table. Since + the offset must always be a multiple of 4, we + use the least significant bit to record whether + we have initialized it already. + + When doing a dynamic link, we create a .rela.got + relocation entry to initialize the value. This + is done in the finish_dynamic_symbol routine. */ + if ((off & 1) != 0) + off &= ~1; + else + { + bfd_put_32 (output_bfd, relocation, + sgot->contents + off); + h->got.offset |= 1; + } + } + } + else + { + BFD_ASSERT (local_got_offsets != NULL + && local_got_offsets[r_symndx] != (bfd_vma) -1); + + off = local_got_offsets[r_symndx]; + + /* The offset must always be a multiple of 4. We use + the least significant bit to record whether we have + already generated the necessary reloc. */ + if ((off & 1) != 0) + off &= ~1; + else + { + bfd_put_32 (output_bfd, relocation, sgot->contents + off); + + if (info->shared) + { + asection *srelgot; + Elf_Internal_Rela outrel; + + srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); + BFD_ASSERT (srelgot != NULL); + + outrel.r_offset = (sgot->output_section->vma + + sgot->output_offset + + off); + outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); + outrel.r_addend = relocation; + bfd_elf32_swap_reloca_out (output_bfd, &outrel, + (((Elf32_External_Rela *) + srelgot->contents) + + srelgot->reloc_count)); + ++srelgot->reloc_count; + } + + local_got_offsets[r_symndx] |= 1; + } + } + + relocation = sgot->output_offset + off; + if (r_type == R_68K_GOT8O + || r_type == R_68K_GOT16O + || r_type == R_68K_GOT32O) + { + /* This relocation does not use the addend. */ + rel->r_addend = 0; + } + else + relocation += sgot->output_section->vma; + } + break; + + case R_68K_PLT8: + case R_68K_PLT16: + case R_68K_PLT32: + /* Relocation is to the entry for this symbol in the + procedure linkage table. */ + + /* Resolve a PLTxx reloc against a local symbol directly, + without using the procedure linkage table. */ + if (h == NULL) + break; + + if (h->plt.offset == (bfd_vma) -1 + || !elf_hash_table (info)->dynamic_sections_created) + { + /* We didn't make a PLT entry for this symbol. This + happens when statically linking PIC code, or when + using -Bsymbolic. */ + break; + } + + if (splt == NULL) + { + splt = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (splt != NULL); + } + + relocation = (splt->output_section->vma + + splt->output_offset + + h->plt.offset); + break; + + case R_68K_PLT8O: + case R_68K_PLT16O: + case R_68K_PLT32O: + /* Relocation is the offset of the entry for this symbol in + the procedure linkage table. */ + BFD_ASSERT (h != NULL && h->plt.offset != (bfd_vma) -1); + + if (splt == NULL) + { + splt = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (splt != NULL); + } + + relocation = h->plt.offset; + + /* This relocation does not use the addend. */ + rel->r_addend = 0; + + break; + + case R_68K_PC8: + case R_68K_PC16: + case R_68K_PC32: + if (h == NULL) + break; + /* Fall through. */ + case R_68K_8: + case R_68K_16: + case R_68K_32: + if (info->shared + && (input_section->flags & SEC_ALLOC) != 0 + && ((r_type != R_68K_PC8 + && r_type != R_68K_PC16 + && r_type != R_68K_PC32) + || (!info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0))) + { + Elf_Internal_Rela outrel; + boolean skip, relocate; + + /* When generating a shared object, these relocations + are copied into the output file to be resolved at run + time. */ + + if (sreloc == NULL) + { + const char *name; + + name = (bfd_elf_string_from_elf_section + (input_bfd, + elf_elfheader (input_bfd)->e_shstrndx, + elf_section_data (input_section)->rel_hdr.sh_name)); + if (name == NULL) + return false; + + BFD_ASSERT (strncmp (name, ".rela", 5) == 0 + && strcmp (bfd_get_section_name (input_bfd, + input_section), + name + 5) == 0); + + sreloc = bfd_get_section_by_name (dynobj, name); + BFD_ASSERT (sreloc != NULL); + } + + skip = false; + + if (elf_section_data (input_section)->stab_info == NULL) + outrel.r_offset = rel->r_offset; + else + { + bfd_vma off; + + off = (_bfd_stab_section_offset + (output_bfd, &elf_hash_table (info)->stab_info, + input_section, + &elf_section_data (input_section)->stab_info, + rel->r_offset)); + if (off == (bfd_vma) -1) + skip = true; + outrel.r_offset = off; + } + + outrel.r_offset += (input_section->output_section->vma + + input_section->output_offset); + + if (skip) + { + memset (&outrel, 0, sizeof outrel); + relocate = false; + } + /* h->dynindx may be -1 if the symbol was marked to + become local. */ + else if (h != NULL + && ((! info->symbolic && h->dynindx != -1) + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)) + { + BFD_ASSERT (h->dynindx != -1); + relocate = false; + outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); + outrel.r_addend = relocation + rel->r_addend; + } + else + { + if (r_type == R_68K_32) + { + relocate = true; + outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); + outrel.r_addend = relocation + rel->r_addend; + } + else + { + long indx; + + if (h == NULL) + sec = local_sections[r_symndx]; + else + { + BFD_ASSERT (h->root.type == bfd_link_hash_defined + || (h->root.type + == bfd_link_hash_defweak)); + sec = h->root.u.def.section; + } + if (sec != NULL && bfd_is_abs_section (sec)) + indx = 0; + else if (sec == NULL || sec->owner == NULL) + { + bfd_set_error (bfd_error_bad_value); + return false; + } + else + { + asection *osec; + + osec = sec->output_section; + indx = elf_section_data (osec)->dynindx; + BFD_ASSERT (indx > 0); + } + + relocate = false; + outrel.r_info = ELF32_R_INFO (indx, r_type); + outrel.r_addend = relocation + rel->r_addend; + } + } + + bfd_elf32_swap_reloca_out (output_bfd, &outrel, + (((Elf32_External_Rela *) + sreloc->contents) + + sreloc->reloc_count)); + ++sreloc->reloc_count; + + /* This reloc will be computed at runtime, so there's no + need to do anything now, except for R_68K_32 + relocations that have been turned into + R_68K_RELATIVE. */ + if (!relocate) + continue; + } + + break; + + case R_68K_GNU_VTINHERIT: + case R_68K_GNU_VTENTRY: + /* These are no-ops in the end. */ + continue; + + default: + break; + } + + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation, rel->r_addend); + + if (r != bfd_reloc_ok) + { + switch (r) + { + default: + case bfd_reloc_outofrange: + abort (); + case bfd_reloc_overflow: + { + 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) + return false; + if (*name == '\0') + name = bfd_section_name (input_bfd, sec); + } + if (!(info->callbacks->reloc_overflow + (info, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset))) + return false; + } + break; + } + } + } + + return true; +} + +/* Finish up dynamic symbol handling. We set the contents of various + dynamic sections here. */ + +static boolean +elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym) + bfd *output_bfd; + struct bfd_link_info *info; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *sym; +{ + bfd *dynobj; + + dynobj = elf_hash_table (info)->dynobj; + + if (h->plt.offset != (bfd_vma) -1) + { + asection *splt; + asection *sgot; + asection *srela; + bfd_vma plt_index; + bfd_vma got_offset; + Elf_Internal_Rela rela; + + /* This symbol has an entry in the procedure linkage table. Set + it up. */ + + BFD_ASSERT (h->dynindx != -1); + + splt = bfd_get_section_by_name (dynobj, ".plt"); + sgot = bfd_get_section_by_name (dynobj, ".got.plt"); + srela = bfd_get_section_by_name (dynobj, ".rela.plt"); + BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); + + /* Get the index in the procedure linkage table which + corresponds to this symbol. This is the index of this symbol + in all the symbols for which we are making plt entries. The + first entry in the procedure linkage table is reserved. */ + plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; + + /* Get the offset into the .got table of the entry that + corresponds to this function. Each .got entry is 4 bytes. + The first three are reserved. */ + got_offset = (plt_index + 3) * 4; + + /* Fill in the entry in the procedure linkage table. */ + memcpy (splt->contents + h->plt.offset, elf_m68k_plt_entry, + PLT_ENTRY_SIZE); + /* The offset is relative to the first extension word. */ + bfd_put_32 (output_bfd, + (sgot->output_section->vma + + sgot->output_offset + + got_offset + - (splt->output_section->vma + + h->plt.offset + 2)), + splt->contents + h->plt.offset + 4); + + bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela), + splt->contents + h->plt.offset + 10); + bfd_put_32 (output_bfd, - (h->plt.offset + 16), + splt->contents + h->plt.offset + 16); + + /* Fill in the entry in the global offset table. */ + bfd_put_32 (output_bfd, + (splt->output_section->vma + + splt->output_offset + + h->plt.offset + + 8), + sgot->contents + got_offset); + + /* Fill in the entry in the .rela.plt section. */ + rela.r_offset = (sgot->output_section->vma + + sgot->output_offset + + got_offset); + rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT); + rela.r_addend = 0; + bfd_elf32_swap_reloca_out (output_bfd, &rela, + ((Elf32_External_Rela *) srela->contents + + plt_index)); + + if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + { + /* Mark the symbol as undefined, rather than as defined in + the .plt section. Leave the value alone. */ + sym->st_shndx = SHN_UNDEF; + } + } + + if (h->got.offset != (bfd_vma) -1) + { + asection *sgot; + asection *srela; + Elf_Internal_Rela rela; + + /* This symbol has an entry in the global offset table. Set it + up. */ + + sgot = bfd_get_section_by_name (dynobj, ".got"); + srela = bfd_get_section_by_name (dynobj, ".rela.got"); + BFD_ASSERT (sgot != NULL && srela != NULL); + + rela.r_offset = (sgot->output_section->vma + + sgot->output_offset + + (h->got.offset &~ 1)); + + /* If this is a -Bsymbolic link, and the symbol is defined + locally, we just want to emit a RELATIVE reloc. Likewise if + the symbol was forced to be local because of a version file. + The entry in the global offset table will already have been + initialized in the relocate_section function. */ + if (info->shared + && (info->symbolic || h->dynindx == -1) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) + { + rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE); + rela.r_addend = bfd_get_signed_32 (output_bfd, + (sgot->contents + + (h->got.offset & ~1))); + } + else + { + bfd_put_32 (output_bfd, (bfd_vma) 0, + sgot->contents + (h->got.offset & ~1)); + rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT); + rela.r_addend = 0; + } + + bfd_elf32_swap_reloca_out (output_bfd, &rela, + ((Elf32_External_Rela *) srela->contents + + srela->reloc_count)); + ++srela->reloc_count; + } + + if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) + { + asection *s; + Elf_Internal_Rela rela; + + /* This symbol needs a copy reloc. Set it up. */ + + BFD_ASSERT (h->dynindx != -1 + && (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak)); + + s = bfd_get_section_by_name (h->root.u.def.section->owner, + ".rela.bss"); + BFD_ASSERT (s != NULL); + + rela.r_offset = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY); + rela.r_addend = 0; + bfd_elf32_swap_reloca_out (output_bfd, &rela, + ((Elf32_External_Rela *) s->contents + + s->reloc_count)); + ++s->reloc_count; + } + + /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ + if (strcmp (h->root.root.string, "_DYNAMIC") == 0 + || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) + sym->st_shndx = SHN_ABS; + + return true; +} + +/* Finish up the dynamic sections. */ + +static boolean +elf_m68k_finish_dynamic_sections (output_bfd, info) + bfd *output_bfd; + struct bfd_link_info *info; +{ + bfd *dynobj; + asection *sgot; + asection *sdyn; + + dynobj = elf_hash_table (info)->dynobj; + + sgot = bfd_get_section_by_name (dynobj, ".got.plt"); + BFD_ASSERT (sgot != NULL); + sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); + + if (elf_hash_table (info)->dynamic_sections_created) + { + asection *splt; + Elf32_External_Dyn *dyncon, *dynconend; + + splt = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (splt != NULL && sdyn != NULL); + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + const char *name; + asection *s; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + break; + + case DT_PLTGOT: + name = ".got"; + goto get_vma; + case DT_JMPREL: + name = ".rela.plt"; + get_vma: + s = bfd_get_section_by_name (output_bfd, name); + BFD_ASSERT (s != NULL); + dyn.d_un.d_ptr = s->vma; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_PLTRELSZ: + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + BFD_ASSERT (s != NULL); + if (s->_cooked_size != 0) + dyn.d_un.d_val = s->_cooked_size; + else + dyn.d_un.d_val = s->_raw_size; + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + + case DT_RELASZ: + /* The procedure linkage table relocs (DT_JMPREL) should + not be included in the overall relocs (DT_RELA). + Therefore, we override the DT_RELASZ entry here to + make it not include the JMPREL relocs. 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. */ + s = bfd_get_section_by_name (output_bfd, ".rela.plt"); + if (s != NULL) + { + if (s->_cooked_size != 0) + dyn.d_un.d_val -= s->_cooked_size; + else + dyn.d_un.d_val -= s->_raw_size; + } + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + break; + } + } + + /* Fill in the first entry in the procedure linkage table. */ + if (splt->_raw_size > 0) + { + memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE); + bfd_put_32 (output_bfd, + (sgot->output_section->vma + + sgot->output_offset + 4 + - (splt->output_section->vma + 2)), + splt->contents + 4); + bfd_put_32 (output_bfd, + (sgot->output_section->vma + + sgot->output_offset + 8 + - (splt->output_section->vma + 10)), + splt->contents + 12); + } + + elf_section_data (splt->output_section)->this_hdr.sh_entsize + = PLT_ENTRY_SIZE; + } + + /* Fill in the first three entries in the global offset table. */ + if (sgot->_raw_size > 0) + { + if (sdyn == NULL) + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); + else + bfd_put_32 (output_bfd, + sdyn->output_section->vma + sdyn->output_offset, + sgot->contents); + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); + bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); + } + + elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; + + if (info->shared) + { + asection *sdynsym; + asection *s; + Elf_Internal_Sym sym; + int c; + + /* Set up the section symbols for the output sections. */ + + sdynsym = bfd_get_section_by_name (dynobj, ".dynsym"); + BFD_ASSERT (sdynsym != NULL); + + sym.st_size = 0; + sym.st_name = 0; + sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); + sym.st_other = 0; + + c = 0; + for (s = output_bfd->sections; s != NULL; s = s->next) + { + int indx; + + if (elf_section_data (s)->dynindx == 0) + continue; + + sym.st_value = s->vma; + + indx = elf_section_data (s)->this_idx; + BFD_ASSERT (indx > 0); + sym.st_shndx = indx; + + bfd_elf32_swap_symbol_out (output_bfd, &sym, + (PTR) (((Elf32_External_Sym *) + sdynsym->contents) + + elf_section_data (s)->dynindx)); + + ++c; + } + + /* Set the sh_info field of the output .dynsym section to the + index of the first global symbol. */ + elf_section_data (sdynsym->output_section)->this_hdr.sh_info = c + 1; + } + + return true; +} + +#define TARGET_BIG_SYM bfd_elf32_m68k_vec +#define TARGET_BIG_NAME "elf32-m68k" +#define ELF_MACHINE_CODE EM_68K +#define ELF_MAXPAGESIZE 0x2000 +#define elf_backend_create_dynamic_sections \ + _bfd_elf_create_dynamic_sections +#define bfd_elf32_bfd_link_hash_table_create \ + elf_m68k_link_hash_table_create +#define bfd_elf32_bfd_final_link _bfd_elf32_gc_common_final_link + +#define elf_backend_check_relocs elf_m68k_check_relocs +#define elf_backend_adjust_dynamic_symbol \ + elf_m68k_adjust_dynamic_symbol +#define elf_backend_size_dynamic_sections \ + elf_m68k_size_dynamic_sections +#define elf_backend_relocate_section elf_m68k_relocate_section +#define elf_backend_finish_dynamic_symbol \ + elf_m68k_finish_dynamic_symbol +#define elf_backend_finish_dynamic_sections \ + elf_m68k_finish_dynamic_sections +#define elf_backend_gc_mark_hook elf_m68k_gc_mark_hook +#define elf_backend_gc_sweep_hook elf_m68k_gc_sweep_hook +#define elf_backend_can_gc_sections 1 +#define elf_backend_want_got_plt 1 +#define elf_backend_plt_readonly 1 +#define elf_backend_want_plt_sym 0 +#define elf_backend_got_header_size 12 +#define elf_backend_plt_header_size PLT_ENTRY_SIZE + +#include "elf32-target.h" |