diff options
Diffstat (limited to 'bfd/elflink.h')
| -rw-r--r-- | bfd/elflink.h | 238 |
1 files changed, 236 insertions, 2 deletions
diff --git a/bfd/elflink.h b/bfd/elflink.h index 1a6399b..4428767 100644 --- a/bfd/elflink.h +++ b/bfd/elflink.h @@ -67,6 +67,12 @@ static boolean elf_link_size_reloc_section static void elf_link_adjust_relocs PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int, struct elf_link_hash_entry **)); +static int elf_link_sort_cmp1 + PARAMS ((const void *, const void *)); +static int elf_link_sort_cmp2 + PARAMS ((const void *, const void *)); +static size_t elf_link_sort_relocs + PARAMS ((bfd *, struct bfd_link_info *, asection **)); /* Given an ELF BFD, add symbols to the global hash table as appropriate. */ @@ -3065,6 +3071,7 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath, asection *s; size_t bucketcount = 0; size_t hash_entry_size; + unsigned int dtagcount; /* Set up the version definition section. */ s = bfd_get_section_by_name (dynobj, ".gnu.version_d"); @@ -3439,8 +3446,9 @@ NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath, BFD_ASSERT (s != NULL); s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr); - if (! elf_add_dynamic_entry (info, DT_NULL, 0)) - return false; + for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount) + if (! elf_add_dynamic_entry (info, DT_NULL, 0)) + return false; } return true; @@ -4270,6 +4278,210 @@ elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash) free (irela); } +struct elf_link_sort_rela { + bfd_vma offset; + enum elf_reloc_type_class type; + union { + Elf_Internal_Rel rel; + Elf_Internal_Rela rela; + } u; +}; + +static int +elf_link_sort_cmp1 (A, B) + const PTR A; + const PTR B; +{ + struct elf_link_sort_rela *a = (struct elf_link_sort_rela *)A; + struct elf_link_sort_rela *b = (struct elf_link_sort_rela *)B; + int relativea, relativeb; + + relativea = a->type == reloc_class_relative; + relativeb = b->type == reloc_class_relative; + + if (relativea < relativeb) + return -1; + if (relativea > relativeb) + return 1; + if (ELF_R_SYM (a->u.rel.r_info) < ELF_R_SYM (b->u.rel.r_info)) + return -1; + if (ELF_R_SYM (a->u.rel.r_info) > ELF_R_SYM (b->u.rel.r_info)) + return 1; + if (a->u.rel.r_offset < b->u.rel.r_offset) + return -1; + if (a->u.rel.r_offset > b->u.rel.r_offset) + return 1; + return 0; +} + +static int +elf_link_sort_cmp2 (A, B) + const PTR A; + const PTR B; +{ + struct elf_link_sort_rela *a = (struct elf_link_sort_rela *)A; + struct elf_link_sort_rela *b = (struct elf_link_sort_rela *)B; + int copya, copyb; + + if (a->offset < b->offset) + return -1; + if (a->offset > b->offset) + return 1; + copya = a->type == reloc_class_copy; + copyb = b->type == reloc_class_copy; + if (copya < copyb) + return -1; + if (copya > copyb) + return 1; + if (a->u.rel.r_offset < b->u.rel.r_offset) + return -1; + if (a->u.rel.r_offset > b->u.rel.r_offset) + return 1; + return 0; +} + +static size_t +elf_link_sort_relocs (abfd, info, psec) + bfd *abfd; + struct bfd_link_info *info; + asection **psec; +{ + bfd *dynobj = elf_hash_table (info)->dynobj; + asection *reldyn, *o; + boolean rel = false; + size_t count, size, i, j, ret; + struct elf_link_sort_rela *rela; + struct elf_backend_data *bed = get_elf_backend_data (abfd); + + reldyn = bfd_get_section_by_name (abfd, ".rela.dyn"); + if (reldyn == NULL || reldyn->_raw_size == 0) + { + reldyn = bfd_get_section_by_name (abfd, ".rel.dyn"); + if (reldyn == NULL || reldyn->_raw_size == 0) + return 0; + rel = true; + count = reldyn->_raw_size / sizeof (Elf_External_Rel); + } + else + count = reldyn->_raw_size / sizeof (Elf_External_Rela); + + size = 0; + for (o = dynobj->sections; o != NULL; o = o->next) + if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)) + == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED) + && o->output_section == reldyn) + size += o->_raw_size; + + if (size != reldyn->_raw_size) + return 0; + + rela = (struct elf_link_sort_rela *) calloc (sizeof (*rela), count); + if (rela == NULL) + { + (*info->callbacks->warning) + (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0); + return 0; + } + + for (o = dynobj->sections; o != NULL; o = o->next) + if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)) + == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED) + && o->output_section == reldyn) + { + if (rel) + { + Elf_External_Rel *erel, *erelend; + struct elf_link_sort_rela *s; + + erel = (Elf_External_Rel *) o->contents; + erelend = (Elf_External_Rel *) ((PTR) o->contents + o->_raw_size); + s = rela + o->output_offset / sizeof (Elf_External_Rel); + for (; erel < erelend; erel++, s++) + { + if (bed->s->swap_reloc_in) + (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &s->u.rel); + else + elf_swap_reloc_in (abfd, erel, &s->u.rel); + + s->type = (*bed->elf_backend_reloc_type_class) + (ELF_R_TYPE (s->u.rel.r_info)); + } + } + else + { + Elf_External_Rela *erela, *erelaend; + struct elf_link_sort_rela *s; + + erela = (Elf_External_Rela *) o->contents; + erelaend = (Elf_External_Rela *) ((PTR) o->contents + o->_raw_size); + s = rela + o->output_offset / sizeof (Elf_External_Rela); + for (; erela < erelaend; erela++, s++) + { + if (bed->s->swap_reloca_in) + (*bed->s->swap_reloca_in) (dynobj, (bfd_byte *) erela, &s->u.rela); + else + elf_swap_reloca_in (dynobj, erela, &s->u.rela); + + s->type = (*bed->elf_backend_reloc_type_class) + (ELF_R_TYPE (s->u.rel.r_info)); + } + } + } + + qsort (rela, count, sizeof (*rela), elf_link_sort_cmp1); + for (i = 0, j = 0; i < count && rela[i].type != reloc_class_relative; i++) + { + if (ELF_R_SYM (rela[i].u.rel.r_info) != ELF_R_SYM (rela[j].u.rel.r_info)) + j = i; + rela[i].offset = rela[j].u.rel.r_offset; + } + ret = count - i; + qsort (rela, i, sizeof (*rela), elf_link_sort_cmp2); + + for (o = dynobj->sections; o != NULL; o = o->next) + if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)) + == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED) + && o->output_section == reldyn) + { + if (rel) + { + Elf_External_Rel *erel, *erelend; + struct elf_link_sort_rela *s; + + erel = (Elf_External_Rel *) o->contents; + erelend = (Elf_External_Rel *) ((PTR) o->contents + o->_raw_size); + s = rela + o->output_offset / sizeof (Elf_External_Rel); + for (; erel < erelend; erel++, s++) + { + if (bed->s->swap_reloc_out) + (*bed->s->swap_reloc_out) (abfd, &s->u.rel, (bfd_byte *) erel); + else + elf_swap_reloc_out (abfd, &s->u.rel, erel); + } + } + else + { + Elf_External_Rela *erela, *erelaend; + struct elf_link_sort_rela *s; + + erela = (Elf_External_Rela *) o->contents; + erelaend = (Elf_External_Rela *) ((PTR) o->contents + o->_raw_size); + s = rela + o->output_offset / sizeof (Elf_External_Rela); + for (; erela < erelaend; erela++, s++) + { + if (bed->s->swap_reloca_out) + (*bed->s->swap_reloca_out) (dynobj, &s->u.rela, (bfd_byte *) erela); + else + elf_swap_reloca_out (dynobj, &s->u.rela, erela); + } + } + } + + free (rela); + *psec = reldyn; + return ret; +} + /* Do the final step of an ELF link. */ boolean @@ -4296,6 +4508,8 @@ elf_bfd_final_link (abfd, info) struct elf_backend_data *bed = get_elf_backend_data (abfd); struct elf_outext_info eoinfo; boolean merged; + size_t relativecount = 0; + asection *reldyn = 0; if (info->shared) abfd->flags |= DYNAMIC; @@ -4866,6 +5080,9 @@ elf_bfd_final_link (abfd, info) o->reloc_count = 0; } + if (dynamic && info->combreloc && dynobj != NULL) + relativecount = elf_link_sort_relocs (abfd, info, &reldyn); + /* If we are linking against a dynamic object, or generating a shared library, finish up the dynamic linking information. */ if (dynamic) @@ -4890,6 +5107,23 @@ elf_bfd_final_link (abfd, info) { default: break; + case DT_NULL: + if (relativecount > 0 && dyncon + 1 < dynconend) + { + switch (elf_section_data (reldyn)->this_hdr.sh_type) + { + case SHT_REL: dyn.d_tag = DT_RELCOUNT; break; + case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break; + default: break; + } + if (dyn.d_tag != DT_NULL) + { + dyn.d_un.d_val = relativecount; + elf_swap_dyn_out (dynobj, &dyn, dyncon); + relativecount = 0; + } + } + break; case DT_INIT: name = info->init_function; goto get_sym; |