diff options
Diffstat (limited to 'bfd/elf32-i386.c')
| -rw-r--r-- | bfd/elf32-i386.c | 303 |
1 files changed, 186 insertions, 117 deletions
diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c index 211f93a..cf4798e 100644 --- a/bfd/elf32-i386.c +++ b/bfd/elf32-i386.c @@ -49,7 +49,9 @@ static boolean elf_i386_gc_sweep_hook const Elf_Internal_Rela *)); static boolean elf_i386_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); -static boolean allocate_plt_and_got_and_discard_relocs +static boolean allocate_dynrelocs + PARAMS ((struct elf_link_hash_entry *, PTR)); +static boolean readonly_dynrelocs PARAMS ((struct elf_link_hash_entry *, PTR)); static boolean elf_i386_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); @@ -378,12 +380,16 @@ static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] = struct elf_i386_dyn_relocs { - /* Next section. */ struct elf_i386_dyn_relocs *next; - /* A section in dynobj. */ - asection *section; - /* Number of relocs copied in this section. */ + + /* The input section of the reloc. */ + asection *sec; + + /* Total number of relocs copied for the input section. */ bfd_size_type count; + + /* Number of pc-relative relocs copied for the input section. */ + bfd_size_type pc_count; }; /* i386 ELF linker hash entry. */ @@ -392,7 +398,7 @@ struct elf_i386_link_hash_entry { struct elf_link_hash_entry root; - /* Number of PC relative relocs copied for this symbol. */ + /* Track dynamic relocs copied for this symbol. */ struct elf_i386_dyn_relocs *dyn_relocs; }; @@ -743,9 +749,9 @@ elf_i386_check_relocs (abfd, info, sec, relocs) || strcmp (bfd_get_section_name (abfd, sec), name + 4) != 0) { - (*_bfd_error_handler) (_("%s: bad relocation section name `%s\'"), - bfd_archive_filename (abfd), - name); + (*_bfd_error_handler) + (_("%s: bad relocation section name `%s\'"), + bfd_archive_filename (abfd), name); } sreloc = bfd_get_section_by_name (dynobj, name); @@ -763,32 +769,20 @@ elf_i386_check_relocs (abfd, info, sec, relocs) || ! bfd_set_section_alignment (dynobj, sreloc, 2)) return false; } - if (sec->flags & SEC_READONLY) - info->flags |= DF_TEXTREL; + elf_section_data (sec)->sreloc = sreloc; } - sreloc->_raw_size += sizeof (Elf32_External_Rel); - - /* If this is a global symbol, we count the number of PC - relative relocations we have entered for this symbol, - so that we can discard them later as necessary. Note - that this function is only called if we are using an - elf_i386 linker hash table, which means that h is - really a pointer to an elf_i386_link_hash_entry. */ - if (!info->shared - || (h != NULL - && ELF32_R_TYPE (rel->r_info) == R_386_PC32)) + /* If this is a global symbol, we count the number of + relocations we need for this symbol. */ + if (h != NULL) { struct elf_i386_link_hash_entry *eh; struct elf_i386_dyn_relocs *p; eh = (struct elf_i386_link_hash_entry *) h; + p = eh->dyn_relocs; - for (p = eh->dyn_relocs; p != NULL; p = p->next) - if (p->section == sreloc) - break; - - if (p == NULL) + if (p == NULL || p->sec != sec) { p = ((struct elf_i386_dyn_relocs *) bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); @@ -796,11 +790,19 @@ elf_i386_check_relocs (abfd, info, sec, relocs) return false; p->next = eh->dyn_relocs; eh->dyn_relocs = p; - p->section = sreloc; + p->sec = sec; p->count = 0; + p->pc_count = 0; } - ++p->count; + p->count += 1; + if (ELF32_R_TYPE (rel->r_info) == R_386_PC32) + p->pc_count += 1; + } + else + { + /* Track dynamic relocs needed for local syms too. */ + elf_section_data (sec)->local_dynrel += 1; } } @@ -893,6 +895,8 @@ elf_i386_gc_sweep_hook (abfd, info, sec, relocs) struct elf_link_hash_entry *h; bfd *dynobj; + elf_section_data (sec)->local_dynrel = 0; + dynobj = elf_hash_table (info)->dynobj; if (dynobj == NULL) return true; @@ -924,9 +928,32 @@ elf_i386_gc_sweep_hook (abfd, info, sec, relocs) case R_386_32: case R_386_PC32: - if (info->shared) - break; - /* Fall through. */ + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + struct elf_i386_link_hash_entry *eh; + struct elf_i386_dyn_relocs **pp; + struct elf_i386_dyn_relocs *p; + + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + if (!info->shared && h->plt.refcount > 0) + h->plt.refcount -= 1; + + eh = (struct elf_i386_link_hash_entry *) h; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) + if (p->sec == sec) + { + if (ELF32_R_TYPE (rel->r_info) == R_386_PC32) + p->pc_count -= 1; + p->count -= 1; + if (p->count == 0) + *pp = p->next; + break; + } + } + break; case R_386_PLT32: r_symndx = ELF32_R_SYM (rel->r_info); @@ -1087,12 +1114,10 @@ elf_i386_adjust_dynamic_symbol (info, h) || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) /* Allocate space in .plt, .got and associated reloc sections for - global syms. Also discards space allocated for relocs in the - check_relocs function that we subsequently have found to be - unneeded. */ + dynamic relocs. */ static boolean -allocate_plt_and_got_and_discard_relocs (h, inf) +allocate_dynrelocs (h, inf) struct elf_link_hash_entry *h; PTR inf; { @@ -1100,6 +1125,7 @@ allocate_plt_and_got_and_discard_relocs (h, inf) struct elf_i386_link_hash_table *htab; asection *s; struct elf_i386_link_hash_entry *eh; + struct elf_i386_dyn_relocs *p; if (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) @@ -1191,53 +1217,106 @@ allocate_plt_and_got_and_discard_relocs (h, inf) else h->got.offset = (bfd_vma) -1; - /* In the shared -Bsymbolic case, discard space allocated for - dynamic relocs against symbols which turn out to be defined - in regular objects. For the normal shared case, discard space - for relocs that have become local due to symbol visibility - changes. For the non-shared case, discard space for symbols - which turn out to need copy relocs or are not dynamic. */ - eh = (struct elf_i386_link_hash_entry *) h; if (eh->dyn_relocs == NULL) return true; - if (!info->shared - && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 - && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 - && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) - || (htab->root.dynamic_sections_created - && (h->root.type == bfd_link_hash_undefweak - || h->root.type == bfd_link_hash_undefined)))) + /* In the shared -Bsymbolic case, discard space allocated for + dynamic pc-relative relocs against symbols which turn out to be + defined in regular objects. For the normal shared case, discard + space for relocs that have become local due to symbol visibility + changes. */ + + if (info->shared) { - /* Make sure this symbol is output as a dynamic symbol. - Undefined weak syms won't yet be marked as dynamic. */ - if (h->dynindx == -1 - && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 + && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 + || info->symbolic)) { - if (! bfd_elf32_link_record_dynamic_symbol (info, h)) - return false; + struct elf_i386_dyn_relocs **pp; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) + { + p->count -= p->pc_count; + p->pc_count = 0; + if (p->count == 0) + *pp = p->next; + else + pp = &p->next; + } } + } + else + { + /* For the non-shared case, discard space for relocs against + symbols which turn out to need copy relocs or are not + dynamic. */ + + if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 + && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + || (htab->root.dynamic_sections_created + && (h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_undefined)))) + { + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + { + if (! bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + } - /* If that succeeded, we know we'll be keeping all the relocs. */ - if (h->dynindx != -1) - return true; + /* If that succeeded, we know we'll be keeping all the + relocs. */ + if (h->dynindx != -1) + goto keep; + } + + eh->dyn_relocs = NULL; + + keep: } - if (!info->shared - || ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 - && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 - || info->symbolic))) + /* Finally, allocate space. */ + for (p = eh->dyn_relocs; p != NULL; p = p->next) { - struct elf_i386_dyn_relocs *c; - - for (c = eh->dyn_relocs; c != NULL; c = c->next) - c->section->_raw_size -= c->count * sizeof (Elf32_External_Rel); + asection *sreloc = elf_section_data (p->sec)->sreloc; + sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel); } return true; } +/* Find any dynamic relocs that apply to read-only sections. */ + +static boolean +readonly_dynrelocs (h, inf) + struct elf_link_hash_entry *h; + PTR inf; +{ + struct elf_i386_link_hash_entry *eh; + struct elf_i386_dyn_relocs *p; + + eh = (struct elf_i386_link_hash_entry *) h; + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *s = p->sec->output_section; + + if (s != NULL && (s->flags & SEC_READONLY) != 0) + { + struct bfd_link_info *info = (struct bfd_link_info *) inf; + + info->flags |= DF_TEXTREL; + + /* Not an error, just cut short the traversal. */ + return false; + } + } + return true; +} + /* Set the sizes of the dynamic sections. */ static boolean @@ -1249,7 +1328,7 @@ elf_i386_size_dynamic_sections (output_bfd, info) bfd *dynobj; asection *s; boolean relocs; - bfd *i; + bfd *ibfd; htab = elf_i386_hash_table (info); dynobj = htab->root.dynobj; @@ -1269,8 +1348,9 @@ elf_i386_size_dynamic_sections (output_bfd, info) } } - /* Set up .got offsets for local syms. */ - for (i = info->input_bfds; i; i = i->link_next) + /* Set up .got offsets for local syms, and space for local dynamic + relocs. */ + for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) { bfd_signed_vma *local_got; bfd_signed_vma *end_local_got; @@ -1278,14 +1358,25 @@ elf_i386_size_dynamic_sections (output_bfd, info) Elf_Internal_Shdr *symtab_hdr; asection *srel; - if (bfd_get_flavour (i) != bfd_target_elf_flavour) + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) continue; - local_got = elf_local_got_refcounts (i); + for (s = ibfd->sections; s != NULL; s = s->next) + { + bfd_size_type count = elf_section_data (s)->local_dynrel; + + if (count != 0) + { + srel = elf_section_data (s)->sreloc; + srel->_raw_size += count * sizeof (Elf32_External_Rel); + } + } + + local_got = elf_local_got_refcounts (ibfd); if (!local_got) continue; - symtab_hdr = &elf_tdata (i)->symtab_hdr; + symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; locsymcount = symtab_hdr->sh_info; end_local_got = local_got + locsymcount; s = htab->sgot; @@ -1304,11 +1395,9 @@ elf_i386_size_dynamic_sections (output_bfd, info) } } - /* Allocate global sym .plt and .got entries. Also discard all - unneeded relocs. */ - elf_link_hash_traverse (&htab->root, - allocate_plt_and_got_and_discard_relocs, - (PTR) info); + /* Allocate global sym .plt and .got entries, and space for global + sym dynamic relocs. */ + elf_link_hash_traverse (&htab->root, allocate_dynrelocs, (PTR) info); /* We now have determined the sizes of the various dynamic sections. Allocate memory for them. */ @@ -1402,12 +1491,16 @@ elf_i386_size_dynamic_sections (output_bfd, info) || !add_dynamic_entry (DT_RELSZ, 0) || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) return false; - } - if ((info->flags & DF_TEXTREL) != 0) - { - if (!add_dynamic_entry (DT_TEXTREL, 0)) - return false; + /* If any dynamic relocs apply to a read-only section, + then we need a DT_TEXTREL entry. */ + elf_link_hash_traverse (&htab->root, readonly_dynrelocs, (PTR) info); + + if ((info->flags & DF_TEXTREL) != 0) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return false; + } } } #undef add_dynamic_entry @@ -1434,7 +1527,6 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; bfd_vma *local_got_offsets; - asection *sreloc; Elf_Internal_Rela *rel; Elf_Internal_Rela *relend; @@ -1444,7 +1536,6 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, sym_hashes = elf_sym_hashes (input_bfd); local_got_offsets = elf_local_got_offsets (input_bfd); - sreloc = NULL; rel = relocs; relend = relocs + input_section->reloc_count; for (; rel < relend; rel++) @@ -1712,38 +1803,13 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, { Elf_Internal_Rel outrel; boolean skip, relocate; + asection *sreloc; + Elf32_External_Rel *loc; /* 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; - - if (strncmp (name, ".rel", 4) != 0 - || strcmp (bfd_get_section_name (input_bfd, - input_section), - name + 4) != 0) - { - (*_bfd_error_handler) - (_("%s: bad relocation section name `%s\'"), - bfd_archive_filename (input_bfd), name); - return false; - } - - sreloc = bfd_get_section_by_name (dynobj, name); - if (sreloc == NULL) - abort (); - } - skip = false; if (elf_section_data (input_section)->stab_info == NULL) @@ -1786,11 +1852,14 @@ elf_i386_relocate_section (output_bfd, info, input_bfd, input_section, outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE); } - bfd_elf32_swap_reloc_out (output_bfd, &outrel, - (((Elf32_External_Rel *) - sreloc->contents) - + sreloc->reloc_count)); - ++sreloc->reloc_count; + sreloc = elf_section_data (input_section)->sreloc; + if (sreloc == NULL) + abort (); + + loc = ((Elf32_External_Rel *) sreloc->contents + + sreloc->reloc_count); + sreloc->reloc_count += 1; + bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); /* If this reloc is against an external symbol, we do not want to fiddle with the addend. Otherwise, we |