diff options
Diffstat (limited to 'contrib/binutils/bfd/elf32-i386.c')
| -rw-r--r-- | contrib/binutils/bfd/elf32-i386.c | 264 |
1 files changed, 93 insertions, 171 deletions
diff --git a/contrib/binutils/bfd/elf32-i386.c b/contrib/binutils/bfd/elf32-i386.c index 754aa52..0e023df 100644 --- a/contrib/binutils/bfd/elf32-i386.c +++ b/contrib/binutils/bfd/elf32-i386.c @@ -1,6 +1,6 @@ /* Intel 80386/80486-specific support for 32-bit ELF Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, - 2003, 2004, 2005, 2006 Free Software Foundation, Inc. + 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. @@ -18,8 +18,8 @@ along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ -#include "bfd.h" #include "sysdep.h" +#include "bfd.h" #include "bfdlink.h" #include "libbfd.h" #include "elf-bfd.h" @@ -330,6 +330,20 @@ elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, return 0; } +static reloc_howto_type * +elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++) + if (elf_howto_table[i].name != NULL + && strcasecmp (elf_howto_table[i].name, r_name) == 0) + return &elf_howto_table[i]; + + return NULL; +} + static void elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, @@ -582,10 +596,6 @@ struct elf_i386_link_hash_entry #define GOT_TLS_IE_NEG 6 #define GOT_TLS_IE_BOTH 7 #define GOT_TLS_GDESC 8 -#define GOT_TLS_MASK 0x0f -#define GOT_TLS_IE_IE 0x10 -#define GOT_TLS_IE_GD 0x20 -#define GOT_TLS_IE_MASK 0x30 #define GOT_TLS_GD_BOTH_P(type) \ ((type) == (GOT_TLS_GD | GOT_TLS_GDESC)) #define GOT_TLS_GD_P(type) \ @@ -626,11 +636,14 @@ struct elf_i386_obj_tdata static bfd_boolean elf_i386_mkobject (bfd *abfd) { - bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); - abfd->tdata.any = bfd_zalloc (abfd, amt); if (abfd->tdata.any == NULL) - return FALSE; - return TRUE; + { + bfd_size_type amt = sizeof (struct elf_i386_obj_tdata); + abfd->tdata.any = bfd_zalloc (abfd, amt); + if (abfd->tdata.any == NULL) + return FALSE; + } + return bfd_elf_mkobject (abfd); } /* i386 ELF linker hash table. */ @@ -1011,25 +1024,12 @@ elf_i386_check_relocs (bfd *abfd, case R_386_TLS_IE_32: if (ELF32_R_TYPE (rel->r_info) == r_type) tls_type = GOT_TLS_IE_NEG; - else if (h - && ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD) - /* If this is a GD->IE transition, we may use either - of R_386_TLS_TPOFF and R_386_TLS_TPOFF32. But if - we may have both R_386_TLS_IE and R_386_TLS_GD, - we can't share the same R_386_TLS_TPOFF since - they require different offsets. So we remember - it comes from R_386_TLS_GD. */ - tls_type = GOT_TLS_IE | GOT_TLS_IE_GD; else + /* If this is a GD->IE transition, we may use either of + R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */ tls_type = GOT_TLS_IE; break; case R_386_TLS_IE: - if (h) - { - /* We remember it comes from R_386_TLS_IE. */ - tls_type = GOT_TLS_IE_POS | GOT_TLS_IE_IE; - break; - } case R_386_TLS_GOTIE: tls_type = GOT_TLS_IE_POS; break; } @@ -1069,8 +1069,7 @@ elf_i386_check_relocs (bfd *abfd, tls_type |= old_tls_type; /* If a TLS symbol is accessed using IE at least once, there is no point to use dynamic model for it. */ - else if (old_tls_type != tls_type - && old_tls_type != GOT_UNKNOWN + else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN && (! GOT_TLS_GD_ANY_P (old_tls_type) || (tls_type & GOT_TLS_IE) == 0)) { @@ -1165,7 +1164,7 @@ elf_i386_check_relocs (bfd *abfd, && (sec->flags & SEC_ALLOC) != 0 && (r_type != R_386_PC32 || (h != NULL - && (! info->symbolic + && (! SYMBOLIC_BIND (info, h) || h->root.type == bfd_link_hash_defweak || !h->def_regular)))) || (ELIMINATE_COPY_RELOCS @@ -1192,7 +1191,7 @@ elf_i386_check_relocs (bfd *abfd, if (name == NULL) return FALSE; - if (strncmp (name, ".rel", 4) != 0 + if (! CONST_STRNEQ (name, ".rel") || strcmp (bfd_get_section_name (abfd, sec), name + 4) != 0) { @@ -1294,38 +1293,20 @@ elf_i386_check_relocs (bfd *abfd, static asection * elf_i386_gc_mark_hook (asection *sec, - struct bfd_link_info *info ATTRIBUTE_UNUSED, + 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_386_GNU_VTINHERIT: - case R_386_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 - return bfd_section_from_elf_index (sec->owner, sym->st_shndx); - - return NULL; + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_386_GNU_VTINHERIT: + case R_386_GNU_VTENTRY: + return NULL; + } + + return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym); } /* Update the got entry reference counts for the section being removed. */ @@ -1438,7 +1419,6 @@ elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, { struct elf_i386_link_hash_table *htab; asection *s; - unsigned int power_of_two; /* If this is a function, put it in the procedure linkage table. We will fill in the contents of the procedure linkage table later, @@ -1558,29 +1538,9 @@ elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info, h->needs_copy = 1; } - /* 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 = htab->sdynbss; - s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two)); - if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) - { - if (! bfd_set_section_alignment (htab->elf.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->size; - - /* Increment the section size to make room for the symbol. */ - s->size += h->size; - return TRUE; + return _bfd_elf_adjust_dynamic_copy (h, s); } /* Allocate space in .plt, .got and associated reloc sections for @@ -1700,14 +1660,6 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) asection *s; bfd_boolean dyn; int tls_type = elf_i386_hash_entry(h)->tls_type; - - /* If we have both R_386_TLS_IE and R_386_TLS_GD, GOT_TLS_IE_BOTH - should be used. */ - if ((tls_type & GOT_TLS_IE_MASK) - == (GOT_TLS_IE_IE | GOT_TLS_IE_GD)) - tls_type = GOT_TLS_IE_BOTH; - else - tls_type &= GOT_TLS_MASK; /* Make sure this symbol is output as a dynamic symbol. Undefined weak syms won't yet be marked as dynamic. */ @@ -2052,7 +2004,7 @@ elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, if (htab->elf.hplt != NULL) strip_section = FALSE; } - else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0) + else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel")) { if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2) relocs = TRUE; @@ -2305,51 +2257,6 @@ elf_i386_relocate_section (bfd *output_bfd, howto = elf_howto_table + indx; r_symndx = ELF32_R_SYM (rel->r_info); - - if (info->relocatable) - { - bfd_vma val; - bfd_byte *where; - - /* This is a relocatable 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) - continue; - - sym = local_syms + r_symndx; - if (ELF_ST_TYPE (sym->st_info) != STT_SECTION) - continue; - - sec = local_sections[r_symndx]; - val = sec->output_offset; - if (val == 0) - continue; - - where = contents + rel->r_offset; - switch (howto->size) - { - /* FIXME: overflow checks. */ - case 0: - val += bfd_get_8 (input_bfd, where); - bfd_put_8 (input_bfd, val, where); - break; - case 1: - val += bfd_get_16 (input_bfd, where); - bfd_put_16 (input_bfd, val, where); - break; - case 2: - val += bfd_get_32 (input_bfd, where); - bfd_put_32 (input_bfd, val, where); - break; - default: - abort (); - } - continue; - } - - /* This is a final link. */ h = NULL; sym = NULL; sec = NULL; @@ -2361,10 +2268,12 @@ elf_i386_relocate_section (bfd *output_bfd, relocation = (sec->output_section->vma + sec->output_offset + sym->st_value); - if ((sec->flags & SEC_MERGE) - && ELF_ST_TYPE (sym->st_info) == STT_SECTION) + + if (ELF_ST_TYPE (sym->st_info) == STT_SECTION + && ((sec->flags & SEC_MERGE) != 0 + || (info->relocatable + && sec->output_offset != 0))) { - asection *msec; bfd_vma addend; bfd_byte *where = contents + rel->r_offset; @@ -2398,10 +2307,16 @@ elf_i386_relocate_section (bfd *output_bfd, abort (); } - msec = sec; - addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend); - addend -= relocation; - addend += msec->output_section->vma + msec->output_offset; + if (info->relocatable) + addend += sec->output_offset; + else + { + asection *msec = sec; + addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, + addend); + addend -= relocation; + addend += msec->output_section->vma + msec->output_offset; + } switch (howto->size) { @@ -2434,21 +2349,20 @@ elf_i386_relocate_section (bfd *output_bfd, unresolved_reloc, warned); } - if (r_symndx == 0) + if (sec != NULL && elf_discarded_section (sec)) { - /* r_symndx will be zero only for relocs against symbols from - removed linkonce sections, or sections discarded by a linker - script. For these relocs, we just want the section contents - zeroed. Avoid any special processing in the switch below. */ - r_type = R_386_NONE; - - relocation = 0; - if (howto->pc_relative) - relocation = (input_section->output_section->vma - + input_section->output_offset - + rel->r_offset); + /* For relocs against symbols from removed linkonce sections, + or sections discarded by a linker script, we just want the + section contents zeroed. Avoid any special processing. */ + _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset); + rel->r_info = 0; + rel->r_addend = 0; + continue; } + if (info->relocatable) + continue; + switch (r_type) { case R_386_GOT32: @@ -2652,7 +2566,7 @@ elf_i386_relocate_section (bfd *output_bfd, && h->dynindx != -1 && (r_type == R_386_PC32 || !info->shared - || !info->symbolic + || !SYMBOLIC_BIND (info, h) || !h->def_regular)) outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); else @@ -2711,13 +2625,6 @@ elf_i386_relocate_section (bfd *output_bfd, else if (h != NULL) { tls_type = elf_i386_hash_entry(h)->tls_type; - /* If we have both R_386_TLS_IE and R_386_TLS_GD, - GOT_TLS_IE_BOTH should be used. */ - if ((tls_type & GOT_TLS_IE_MASK) - == (GOT_TLS_IE_IE | GOT_TLS_IE_GD)) - tls_type = GOT_TLS_IE_BOTH; - else - tls_type &= GOT_TLS_MASK; if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE)) r_type = R_386_TLS_LE_32; } @@ -2851,8 +2758,9 @@ elf_i386_relocate_section (bfd *output_bfd, val = bfd_get_8 (input_bfd, contents + roff + 1); BFD_ASSERT (val == 0x10); - /* Now modify the instruction as appropriate. */ - bfd_put_8 (output_bfd, 0x90, contents + roff); + /* Now modify the instruction as appropriate. Use + xchg %ax,%ax instead of 2 nops. */ + bfd_put_8 (output_bfd, 0x66, contents + roff); bfd_put_8 (output_bfd, 0x90, contents + roff + 1); continue; } @@ -3172,12 +3080,8 @@ elf_i386_relocate_section (bfd *output_bfd, subl $foo@gottpoff(%reg), %eax into: addl $foo@gotntpoff(%reg), %eax. */ - if (r_type == R_386_TLS_GOTIE) - { - contents[roff + 6] = 0x03; - if (tls_type == GOT_TLS_IE_BOTH) - off += 4; - } + if (tls_type == GOT_TLS_IE_POS) + contents[roff + 6] = 0x03; bfd_put_32 (output_bfd, htab->sgot->output_section->vma + htab->sgot->output_offset + off @@ -3261,8 +3165,8 @@ elf_i386_relocate_section (bfd *output_bfd, /* Now modify the instruction as appropriate. */ if (tls_type != GOT_TLS_IE_NEG) { - /* nop; nop */ - bfd_put_8 (output_bfd, 0x90, contents + roff); + /* xchg %ax,%ax */ + bfd_put_8 (output_bfd, 0x66, contents + roff); bfd_put_8 (output_bfd, 0x90, contents + roff + 1); } else @@ -3872,6 +3776,18 @@ elf_i386_plt_sym_val (bfd_vma i, const asection *plt, return plt->vma + (i + 1) * PLT_ENTRY_SIZE; } +/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */ + +static bfd_boolean +elf_i386_hash_symbol (struct elf_link_hash_entry *h) +{ + if (h->plt.offset != (bfd_vma) -1 + && !h->def_regular + && !h->pointer_equality_needed) + return FALSE; + + return _bfd_elf_hash_symbol (h); +} #define TARGET_LITTLE_SYM bfd_elf32_i386_vec #define TARGET_LITTLE_NAME "elf32-i386" @@ -3895,6 +3811,7 @@ elf_i386_plt_sym_val (bfd_vma i, const asection *plt, #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup +#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol #define elf_backend_check_relocs elf_i386_check_relocs @@ -3911,7 +3828,10 @@ elf_i386_plt_sym_val (bfd_vma i, const asection *plt, #define elf_backend_relocate_section elf_i386_relocate_section #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections #define elf_backend_always_size_sections elf_i386_always_size_sections +#define elf_backend_omit_section_dynsym \ + ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) #define elf_backend_plt_sym_val elf_i386_plt_sym_val +#define elf_backend_hash_symbol elf_i386_hash_symbol #include "elf32-target.h" @@ -3921,6 +3841,8 @@ elf_i386_plt_sym_val (bfd_vma i, const asection *plt, #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec #undef TARGET_LITTLE_NAME #define TARGET_LITTLE_NAME "elf32-i386-freebsd" +#undef ELF_OSABI +#define ELF_OSABI ELFOSABI_FREEBSD /* The kernel recognizes executables as valid only if they carry a "FreeBSD" label in the ELF header. So we put this label on all @@ -3935,7 +3857,7 @@ elf_i386_post_process_headers (bfd *abfd, i_ehdrp = elf_elfheader (abfd); /* Put an ABI label supported by FreeBSD >= 4.1. */ - i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; + i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi; #ifdef OLD_FREEBSD_ABI_LABEL /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */ memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8); @@ -3955,7 +3877,7 @@ elf_i386_post_process_headers (bfd *abfd, #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec #undef TARGET_LITTLE_NAME #define TARGET_LITTLE_NAME "elf32-i386-vxworks" - +#undef ELF_OSABI /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */ |
