diff options
Diffstat (limited to 'bfd')
| -rw-r--r-- | bfd/ChangeLog | 61 | ||||
| -rw-r--r-- | bfd/elf32-i386.c | 287 | ||||
| -rw-r--r-- | bfd/elf64-x86-64.c | 311 |
3 files changed, 502 insertions, 157 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index c2fcf00..19ae632 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,64 @@ +2016-02-26 H.J. Lu <hongjiu.lu@intel.com> + + PR ld/19636 + PR ld/19704 + PR ld/19719 + * elf32-i386.c (UNDEFINED_WEAK_RESOLVED_TO_ZERO): New. + (elf_i386_link_hash_entry): Add has_got_reloc and + has_non_got_reloc. + (elf_i386_link_hash_table): Add interp. + (elf_i386_link_hash_newfunc): Initialize has_got_reloc and + has_non_got_reloc. + (elf_i386_copy_indirect_symbol): Copy has_got_reloc and + has_non_got_reloc. + (elf_i386_check_relocs): Set has_got_reloc and has_non_got_reloc. + (elf_i386_fixup_symbol): New function. + (elf_i386_pie_finish_undefweak_symbol): Likewise. + (elf_i386_allocate_dynrelocs): Don't allocate space for dynamic + relocations and discard relocations against resolved undefined + weak symbols in executable. Don't make resolved undefined weak + symbols in executable dynamic. Keep dynamic non-GOT/non-PLT + relocation against undefined weak symbols in PIE. + (elf_i386_size_dynamic_sections): Set interp to .interp section. + (elf_i386_relocate_section): Don't generate dynamic relocations + against resolved undefined weak symbols in PIE, except for + R_386_PC32. + (elf_i386_finish_dynamic_symbol): Keep PLT/GOT entries without + dynamic PLT/GOT relocations for resolved undefined weak symbols. + Don't generate dynamic relocation against resolved undefined weak + symbol in executable. + (elf_i386_finish_dynamic_sections): Call + elf_i386_pie_finish_undefweak_symbol on all symbols in PIE. + (elf_backend_fixup_symbol): New. + * elf64-x86-64.c (UNDEFINED_WEAK_RESOLVED_TO_ZERO): New. + (elf_x86_64_link_hash_entry): Add has_got_reloc and + has_non_got_reloc. + (elf_x86_64_link_hash_table): Add interp. + (elf_x86_64_link_hash_newfunc): Initialize has_got_reloc and + has_non_got_reloc. + (elf_x86_64_copy_indirect_symbol): Copy has_got_reloc and + has_non_got_reloc. + (elf_x86_64_check_relocs): Set has_got_reloc and + has_non_got_reloc. + (elf_x86_64_fixup_symbol): New function. + (elf_x86_64_pie_finish_undefweak_symbol): Likewise. + (elf_x86_64_allocate_dynrelocs): Don't allocate space for dynamic + relocations and discard relocations against resolved undefined + weak symbols in executable. Don't make resolved undefined weak + symbols in executable dynamic. + (elf_x86_64_size_dynamic_sections): Set interp to .interp section. + (elf_x86_64_relocate_section): Check relocation overflow for + dynamic relocations against unresolved weak undefined symbols. + Don't generate dynamic relocations against resolved weak + undefined symbols in PIE. + (elf_x86_64_finish_dynamic_symbol): Keep PLT/GOT entries without + dynamic PLT/GOT relocations for resolved undefined weak symbols. + Don't generate dynamic relocation against resolved undefined weak + symbol in executable. + (elf_x86_64_finish_dynamic_sections): Call + elf_x86_64_pie_finish_undefweak_symbol on all symbols in PIE. + (elf_backend_fixup_symbol): New. + 2016-02-26 Alan Modra <amodra@gmail.com> * elf64-ppc.c (create_linkage_sections): Create sfpr when diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c index f6c9c65..2ae5e44 100644 --- a/bfd/elf32-i386.c +++ b/bfd/elf32-i386.c @@ -737,6 +737,20 @@ static const struct elf_i386_backend_data elf_i386_arch_bed = #define elf_backend_arch_data &elf_i386_arch_bed +/* Is a undefined weak symbol which is resolved to 0. Reference to an + undefined weak symbol is resolved to 0 when building executable if + it isn't dynamic and + 1. Has non-GOT/non-PLT relocations in text section. Or + 2. Has no GOT/PLT relocation. + */ +#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \ + ((EH)->elf.root.type == bfd_link_hash_undefweak \ + && bfd_link_executable (INFO) \ + && (elf_i386_hash_table (INFO)->interp == NULL \ + || !(EH)->has_got_reloc \ + || (EH)->has_non_got_reloc \ + || !(INFO)->dynamic_undefined_weak)) + /* i386 ELF linker hash entry. */ struct elf_i386_link_hash_entry @@ -767,6 +781,12 @@ struct elf_i386_link_hash_entry /* Symbol is referenced by R_386_GOTOFF relocation. */ unsigned int gotoff_ref : 1; + /* Symbol has GOT or PLT relocations. */ + unsigned int has_got_reloc : 1; + + /* Symbol has non-GOT/non-PLT relocations in text sections. */ + unsigned int has_non_got_reloc : 1; + /* Reference count of C/C++ function pointer relocations in read-write section which can be resolved at run-time. */ bfd_signed_vma func_pointer_refcount; @@ -821,6 +841,7 @@ struct elf_i386_link_hash_table struct elf_link_hash_table elf; /* Short-cuts to get to dynamic linker sections. */ + asection *interp; asection *sdynbss; asection *srelbss; asection *plt_eh_frame; @@ -895,6 +916,8 @@ elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry, eh->dyn_relocs = NULL; eh->tls_type = GOT_UNKNOWN; eh->gotoff_ref = 0; + eh->has_got_reloc = 0; + eh->has_non_got_reloc = 0; eh->func_pointer_refcount = 0; eh->plt_got.offset = (bfd_vma) -1; eh->tlsdesc_got = (bfd_vma) -1; @@ -1138,6 +1161,9 @@ elf_i386_copy_indirect_symbol (struct bfd_link_info *info, generate a R_386_COPY reloc. */ edir->gotoff_ref |= eind->gotoff_ref; + edir->has_got_reloc |= eind->has_got_reloc; + edir->has_non_got_reloc |= eind->has_non_got_reloc; + if (ELIMINATE_COPY_RELOCS && ind->root.type != bfd_link_hash_indirect && dir->dynamic_adjusted) @@ -1630,6 +1656,7 @@ elf_i386_check_relocs (bfd *abfd, if (h == NULL) continue; + eh->has_got_reloc = 1; h->needs_plt = 1; h->plt.refcount += 1; break; @@ -1760,18 +1787,27 @@ elf_i386_check_relocs (bfd *abfd, return FALSE; } if (r_type != R_386_TLS_IE) - break; + { + if (eh != NULL) + eh->has_got_reloc = 1; + break; + } /* Fall through */ case R_386_TLS_LE_32: case R_386_TLS_LE: + if (eh != NULL) + eh->has_got_reloc = 1; if (bfd_link_executable (info)) break; info->flags |= DF_STATIC_TLS; - /* Fall through */ + goto do_relocation; case R_386_32: case R_386_PC32: + if (eh != NULL && (sec->flags & SEC_CODE) != 0) + eh->has_non_got_reloc = 1; +do_relocation: if (h != NULL && bfd_link_executable (info)) { /* If this reloc is in a read-only section, we might @@ -2147,6 +2183,24 @@ elf_i386_gc_sweep_hook (bfd *abfd, return TRUE; } +/* Remove undefined weak symbol from the dynamic symbol table if it + is resolved to 0. */ + +static bfd_boolean +elf_i386_fixup_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *h) +{ + if (h->dynindx != -1 + && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, + elf_i386_hash_entry (h))) + { + h->dynindx = -1; + _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, + h->dynstr_index); + } + 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 @@ -2335,6 +2389,7 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) struct elf_i386_link_hash_entry *eh; struct elf_dyn_relocs *p; unsigned plt_entry_size; + bfd_boolean resolved_to_zero; if (h->root.type == bfd_link_hash_indirect) return TRUE; @@ -2348,6 +2403,8 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); + resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); + /* Clear the reference count of function pointer relocations if symbol isn't a normal function. */ if (h->type != STT_FUNC) @@ -2405,7 +2462,8 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) /* 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->forced_local) + && !h->forced_local + && !resolved_to_zero) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; @@ -2462,9 +2520,15 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) script. */ htab->elf.sgotplt->size += 4; - /* We also need to make an entry in the .rel.plt section. */ - htab->elf.srelplt->size += sizeof (Elf32_External_Rel); - htab->elf.srelplt->reloc_count++; + /* There should be no PLT relocation against resolved + undefined weak symbol in executable. */ + if (!resolved_to_zero) + { + /* We also need to make an entry in the .rel.plt + section. */ + htab->elf.srelplt->size += sizeof (Elf32_External_Rel); + htab->elf.srelplt->reloc_count++; + } } if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks @@ -2520,7 +2584,8 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) /* 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->forced_local) + && !h->forced_local + && !resolved_to_zero) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; @@ -2548,7 +2613,8 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation, (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we need two), R_386_TLS_GD needs one if local symbol and two if - global. */ + global. No dynamic relocation against resolved undefined weak + symbol in executable. */ if (tls_type == GOT_TLS_IE_BOTH) htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) @@ -2557,7 +2623,8 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) else if (GOT_TLS_GD_P (tls_type)) htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel); else if (! GOT_TLS_GDESC_P (tls_type) - && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + && !resolved_to_zero) || h->root.type != bfd_link_hash_undefweak) && (bfd_link_pic (info) || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) @@ -2613,15 +2680,43 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) } /* Also discard relocs on undefined weak syms with non-default - visibility. */ + visibility or in PIE. */ if (eh->dyn_relocs != NULL && h->root.type == bfd_link_hash_undefweak) { - if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) - eh->dyn_relocs = NULL; + /* Undefined weak symbol is never bound locally in shared + library. */ + if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT + || resolved_to_zero) + { + if (h->non_got_ref) + { + /* Keep dynamic non-GOT/non-PLT relocation so that we + can branch to 0 without PLT. */ + struct elf_dyn_relocs **pp; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) + if (p->pc_count == 0) + *pp = p->next; + else + { + /* Remove non-R_386_PC32 relocation. */ + p->count = p->pc_count; + pp = &p->next; + } - /* Make sure undefined weak symbols are output as a dynamic - symbol in PIEs. */ + if (eh->dyn_relocs != NULL) + { + /* Make sure undefined weak symbols are output + as dynamic symbols in PIEs for dynamic non-GOT + non-PLT reloations. */ + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + } + else + eh->dyn_relocs = NULL; + } else if (h->dynindx == -1 && !h->forced_local) { @@ -2637,7 +2732,10 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) dynamic. Keep dynamic relocations for run-time function pointer initialization. */ - if ((!h->non_got_ref || eh->func_pointer_refcount > 0) + if ((!h->non_got_ref + || eh->func_pointer_refcount > 0 + || (h->root.type == bfd_link_hash_undefweak + && !resolved_to_zero)) && ((h->def_dynamic && !h->def_regular) || (htab->elf.dynamic_sections_created @@ -2647,7 +2745,8 @@ elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) /* 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->forced_local) + && !h->forced_local + && !resolved_to_zero) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; @@ -3110,6 +3209,7 @@ elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) abort (); s->size = sizeof ELF_DYNAMIC_INTERPRETER; s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + htab->interp = s; } } @@ -3640,6 +3740,7 @@ elf_i386_relocate_section (bfd *output_bfd, int tls_type; bfd_vma st_size; asection *resolved_plt; + bfd_boolean resolved_to_zero; r_type = ELF32_R_TYPE (rel->r_info); if (r_type == R_386_GNU_VTINHERIT @@ -3981,6 +4082,9 @@ elf_i386_relocate_section (bfd *output_bfd, } eh = (struct elf_i386_link_hash_entry *) h; + resolved_to_zero = (eh != NULL + && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); + switch (r_type) { case R_386_GOT32X: @@ -4246,18 +4350,25 @@ r_386_got32: || is_vxworks_tls) break; - /* Copy dynamic function pointer relocations. */ + /* Copy dynamic function pointer relocations. Don't generate + dynamic relocations against resolved undefined weak symbols + in PIE, except for R_386_PC32. */ if ((bfd_link_pic (info) && (h == NULL - || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) + || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + && (!resolved_to_zero + || r_type == R_386_PC32)) + || h->root.type != bfd_link_hash_undefweak)) && ((r_type != R_386_PC32 && r_type != R_386_SIZE32) || !SYMBOL_CALLS_LOCAL (info, h))) || (ELIMINATE_COPY_RELOCS && !bfd_link_pic (info) && h != NULL && h->dynindx != -1 - && (!h->non_got_ref || eh->func_pointer_refcount > 0) + && (!h->non_got_ref + || eh->func_pointer_refcount > 0 + || (h->root.type == bfd_link_hash_undefweak + && !resolved_to_zero)) && ((h->def_dynamic && !h->def_regular) || h->root.type == bfd_link_hash_undefweak @@ -5011,6 +5122,7 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd, unsigned plt_entry_size; const struct elf_i386_backend_data *abed; struct elf_i386_link_hash_entry *eh; + bfd_boolean local_undefweak; htab = elf_i386_hash_table (info); if (htab == NULL) @@ -5021,6 +5133,11 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd, eh = (struct elf_i386_link_hash_entry *) h; + /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for + resolved undefined weak symbols in executable so that their + references have value 0 at run-time. */ + local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); + if (h->plt.offset != (bfd_vma) -1) { bfd_vma plt_index; @@ -5048,6 +5165,7 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd, it up. */ if ((h->dynindx == -1 + && !local_undefweak && !((h->forced_local || bfd_link_executable (info)) && h->def_regular && h->type == STT_GNU_IFUNC)) @@ -5136,54 +5254,61 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd, + abed->plt->plt_got_offset); } - /* Fill in the entry in the global offset table. */ - bfd_put_32 (output_bfd, - (plt->output_section->vma - + plt->output_offset - + h->plt.offset - + abed->plt->plt_lazy_offset), - gotplt->contents + got_offset); - - /* Fill in the entry in the .rel.plt section. */ - rel.r_offset = (gotplt->output_section->vma - + gotplt->output_offset - + got_offset); - if (h->dynindx == -1 - || ((bfd_link_executable (info) - || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) - && h->def_regular - && h->type == STT_GNU_IFUNC)) + /* Fill in the entry in the global offset table. Leave the entry + as zero for undefined weak symbol in PIE. No PLT relocation + against undefined weak symbol in PIE. */ + if (!local_undefweak) { - /* If an STT_GNU_IFUNC symbol is locally defined, generate - R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend - in the .got.plt section. */ bfd_put_32 (output_bfd, - (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset), + (plt->output_section->vma + + plt->output_offset + + h->plt.offset + + abed->plt->plt_lazy_offset), gotplt->contents + got_offset); - rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); - /* R_386_IRELATIVE comes last. */ - plt_index = htab->next_irelative_index--; - } - else - { - rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); - plt_index = htab->next_jump_slot_index++; - } - loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); - bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); - /* Don't fill PLT entry for static executables. */ - if (plt == htab->elf.splt) - { - bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel), - plt->contents + h->plt.offset - + abed->plt->plt_reloc_offset); - bfd_put_32 (output_bfd, - (h->plt.offset - + abed->plt->plt_plt_offset + 4), - plt->contents + h->plt.offset - + abed->plt->plt_plt_offset); + /* Fill in the entry in the .rel.plt section. */ + rel.r_offset = (gotplt->output_section->vma + + gotplt->output_offset + + got_offset); + if (h->dynindx == -1 + || ((bfd_link_executable (info) + || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) + && h->def_regular + && h->type == STT_GNU_IFUNC)) + { + /* If an STT_GNU_IFUNC symbol is locally defined, generate + R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend + in the .got.plt section. */ + bfd_put_32 (output_bfd, + (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset), + gotplt->contents + got_offset); + rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE); + /* R_386_IRELATIVE comes last. */ + plt_index = htab->next_irelative_index--; + } + else + { + rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT); + plt_index = htab->next_jump_slot_index++; + } + + loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel); + bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); + + /* Don't fill PLT entry for static executables. */ + if (plt == htab->elf.splt) + { + bfd_put_32 (output_bfd, + plt_index * sizeof (Elf32_External_Rel), + plt->contents + h->plt.offset + + abed->plt->plt_reloc_offset); + bfd_put_32 (output_bfd, - (h->plt.offset + + abed->plt->plt_plt_offset + 4), + plt->contents + h->plt.offset + + abed->plt->plt_plt_offset); + } } } else if (eh->plt_got.offset != (bfd_vma) -1) @@ -5229,7 +5354,8 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd, plt->contents + plt_offset + plt_got_offset); } - if (!h->def_regular + if (!local_undefweak + && !h->def_regular && (h->plt.offset != (bfd_vma) -1 || eh->plt_got.offset != (bfd_vma) -1)) { @@ -5246,9 +5372,12 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd, sym->st_value = 0; } + /* Don't generate dynamic GOT relocation against undefined weak + symbol in executable. */ if (h->got.offset != (bfd_vma) -1 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type) - && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0) + && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0 + && !local_undefweak) { Elf_Internal_Rela rel; @@ -5348,6 +5477,25 @@ elf_i386_finish_local_dynamic_symbol (void **slot, void *inf) h, NULL); } +/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry + here since undefined weak symbol may not be dynamic and may not be + called for elf_i386_finish_dynamic_symbol. */ + +static bfd_boolean +elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, + void *inf) +{ + struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; + struct bfd_link_info *info = (struct bfd_link_info *) inf; + + if (h->root.type != bfd_link_hash_undefweak + || h->dynindx != -1) + return TRUE; + + return elf_i386_finish_dynamic_symbol (info->output_bfd, + info, h, NULL); +} + /* Used to decide how to sort relocs in an optimal manner for the dynamic linker, before writing them out. */ @@ -5626,6 +5774,12 @@ elf_i386_finish_dynamic_sections (bfd *output_bfd, elf_i386_finish_local_dynamic_symbol, info); + /* Fill PLT entries for undefined weak symbols in PIE. */ + if (bfd_link_pie (info)) + bfd_hash_traverse (&info->hash->table, + elf_i386_pie_finish_undefweak_symbol, + info); + return TRUE; } @@ -5803,6 +5957,7 @@ elf_i386_add_symbol_hook (bfd * abfd, ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) #define elf_backend_hash_symbol elf_i386_hash_symbol #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook +#define elf_backend_fixup_symbol elf_i386_fixup_symbol #include "elf32-target.h" diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c index 48d263e..6ca3b2e 100644 --- a/bfd/elf64-x86-64.c +++ b/bfd/elf64-x86-64.c @@ -742,6 +742,20 @@ static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed = #define elf_backend_arch_data &elf_x86_64_arch_bed +/* Is a undefined weak symbol which is resolved to 0. Reference to an + undefined weak symbol is resolved to 0 when building executable if + it isn't dynamic and + 1. Has non-GOT/non-PLT relocations in text section. Or + 2. Has no GOT/PLT relocation. + */ +#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \ + ((EH)->elf.root.type == bfd_link_hash_undefweak \ + && bfd_link_executable (INFO) \ + && (elf_x86_64_hash_table (INFO)->interp == NULL \ + || !(EH)->has_got_reloc \ + || (EH)->has_non_got_reloc \ + || !(INFO)->dynamic_undefined_weak)) + /* x86-64 ELF linker hash entry. */ struct elf_x86_64_link_hash_entry @@ -776,6 +790,12 @@ struct elf_x86_64_link_hash_entry /* TRUE if symbol has at least one BND relocation. */ unsigned int has_bnd_reloc : 1; + /* TRUE if symbol has GOT or PLT relocations. */ + unsigned int has_got_reloc : 1; + + /* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */ + unsigned int has_non_got_reloc : 1; + /* Reference count of C/C++ function pointer relocations in read-write section which can be resolved at run-time. */ bfd_signed_vma func_pointer_refcount; @@ -835,6 +855,7 @@ struct elf_x86_64_link_hash_table struct elf_link_hash_table elf; /* Short-cuts to get to dynamic linker sections. */ + asection *interp; asection *sdynbss; asection *srelbss; asection *plt_eh_frame; @@ -919,6 +940,8 @@ elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry, eh->tls_type = GOT_UNKNOWN; eh->needs_copy = 0; eh->has_bnd_reloc = 0; + eh->has_got_reloc = 0; + eh->has_non_got_reloc = 0; eh->func_pointer_refcount = 0; eh->plt_bnd.offset = (bfd_vma) -1; eh->plt_got.offset = (bfd_vma) -1; @@ -1136,6 +1159,12 @@ elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info, if (!edir->has_bnd_reloc) edir->has_bnd_reloc = eind->has_bnd_reloc; + if (!edir->has_got_reloc) + edir->has_got_reloc = eind->has_got_reloc; + + if (!edir->has_non_got_reloc) + edir->has_non_got_reloc = eind->has_non_got_reloc; + if (eind->dyn_relocs != NULL) { if (edir->dyn_relocs != NULL) @@ -1595,6 +1624,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, unsigned int r_type; unsigned long r_symndx; struct elf_link_hash_entry *h; + struct elf_x86_64_link_hash_entry *eh; Elf_Internal_Sym *isym; const char *name; bfd_boolean size_reloc; @@ -1760,6 +1790,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, rel, rel_end, h, r_symndx)) return FALSE; + eh = (struct elf_x86_64_link_hash_entry *) h; switch (r_type) { case R_X86_64_TLSLD: @@ -1781,6 +1812,8 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, bfd_set_error (bfd_error_bad_value); return FALSE; } + if (eh != NULL) + eh->has_got_reloc = 1; break; case R_X86_64_GOTTPOFF: @@ -1815,7 +1848,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, if (h != NULL) { h->got.refcount += 1; - old_tls_type = elf_x86_64_hash_entry (h)->tls_type; + old_tls_type = eh->tls_type; } else { @@ -1873,8 +1906,8 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, if (old_tls_type != tls_type) { - if (h != NULL) - elf_x86_64_hash_entry (h)->tls_type = tls_type; + if (eh != NULL) + eh->tls_type = tls_type; else elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type; } @@ -1885,6 +1918,8 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, case R_X86_64_GOTPC32: case R_X86_64_GOTPC64: create_got: + if (eh != NULL) + eh->has_got_reloc = 1; if (htab->elf.sgot == NULL) { if (htab->elf.dynobj == NULL) @@ -1909,6 +1944,7 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, if (h == NULL) continue; + eh->has_got_reloc = 1; h->needs_plt = 1; h->plt.refcount += 1; break; @@ -1961,6 +1997,8 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info, case R_X86_64_PC64: case R_X86_64_64: pointer: + if (eh != NULL && (sec->flags & SEC_CODE) != 0) + eh->has_non_got_reloc = 1; if (h != NULL && bfd_link_executable (info)) { /* If this reloc is in a read-only section, we might @@ -1994,11 +2032,7 @@ pointer: || (!ABI_64_P (abfd) && (r_type == R_X86_64_32 || r_type == R_X86_64_32S)))) - { - struct elf_x86_64_link_hash_entry *eh - = (struct elf_x86_64_link_hash_entry *) h; - eh->func_pointer_refcount += 1; - } + eh->func_pointer_refcount += 1; } } @@ -2061,9 +2095,7 @@ do_size: /* If this is a global symbol, we count the number of relocations we need for this symbol. */ if (h != NULL) - { - head = &((struct elf_x86_64_link_hash_entry *) h)->dyn_relocs; - } + head = &eh->dyn_relocs; else { /* Track dynamic relocs needed for local syms too. @@ -2363,6 +2395,24 @@ pointer: return TRUE; } +/* Remove undefined weak symbol from the dynamic symbol table if it + is resolved to 0. */ + +static bfd_boolean +elf_x86_64_fixup_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *h) +{ + if (h->dynindx != -1 + && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, + elf_x86_64_hash_entry (h))) + { + h->dynindx = -1; + _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr, + h->dynstr_index); + } + 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 @@ -2552,6 +2602,7 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) struct elf_dyn_relocs *p; const struct elf_backend_data *bed; unsigned int plt_entry_size; + bfd_boolean resolved_to_zero; if (h->root.type == bfd_link_hash_indirect) return TRUE; @@ -2565,6 +2616,8 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) bed = get_elf_backend_data (info->output_bfd); plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd); + resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); + /* We can't use the GOT PLT if pointer equality is needed since finish_dynamic_symbol won't clear symbol value and the dynamic linker won't update the GOT slot. We will get into an infinite @@ -2641,7 +2694,8 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) /* 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->forced_local) + && !h->forced_local + && !resolved_to_zero) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; @@ -2715,10 +2769,15 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) script. */ htab->elf.sgotplt->size += GOT_ENTRY_SIZE; - /* We also need to make an entry in the .rela.plt - section. */ - htab->elf.srelplt->size += bed->s->sizeof_rela; - htab->elf.srelplt->reloc_count++; + /* There should be no PLT relocation against resolved + undefined weak symbol in executable. */ + if (!resolved_to_zero) + { + /* We also need to make an entry in the .rela.plt + section. */ + htab->elf.srelplt->size += bed->s->sizeof_rela; + htab->elf.srelplt->reloc_count++; + } } } else @@ -2755,7 +2814,8 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) /* 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->forced_local) + && !h->forced_local + && !resolved_to_zero) { if (! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; @@ -2779,15 +2839,17 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) } dyn = htab->elf.dynamic_sections_created; /* R_X86_64_TLSGD needs one dynamic relocation if local symbol - and two if global. - R_X86_64_GOTTPOFF needs one dynamic relocation. */ + and two if global. R_X86_64_GOTTPOFF needs one dynamic + relocation. No dynamic relocation against resolved undefined + weak symbol in executable. */ if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1) || tls_type == GOT_TLS_IE) htab->elf.srelgot->size += bed->s->sizeof_rela; else if (GOT_TLS_GD_P (tls_type)) htab->elf.srelgot->size += 2 * bed->s->sizeof_rela; else if (! GOT_TLS_GDESC_P (tls_type) - && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + && !resolved_to_zero) || h->root.type != bfd_link_hash_undefweak) && (bfd_link_pic (info) || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) @@ -2834,16 +2896,16 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) } /* Also discard relocs on undefined weak syms with non-default - visibility. */ + visibility or in PIE. */ if (eh->dyn_relocs != NULL) { if (h->root.type == bfd_link_hash_undefweak) { - if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) + /* Undefined weak symbol is never bound locally in shared + library. */ + if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT + || resolved_to_zero) eh->dyn_relocs = NULL; - - /* Make sure undefined weak symbols are output as a dynamic - symbol in PIEs. */ else if (h->dynindx == -1 && ! h->forced_local && ! bfd_elf_link_record_dynamic_symbol (info, h)) @@ -2875,7 +2937,10 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) dynamic. Keep dynamic relocations for run-time function pointer initialization. */ - if ((!h->non_got_ref || eh->func_pointer_refcount > 0) + if ((!h->non_got_ref + || eh->func_pointer_refcount > 0 + || (h->root.type == bfd_link_hash_undefweak + && !resolved_to_zero)) && ((h->def_dynamic && !h->def_regular) || (htab->elf.dynamic_sections_created @@ -2886,6 +2951,7 @@ elf_x86_64_allocate_dynrelocs (struct elf_link_hash_entry *h, void * inf) Undefined weak syms won't yet be marked as dynamic. */ if (h->dynindx == -1 && ! h->forced_local + && ! resolved_to_zero && ! bfd_elf_link_record_dynamic_symbol (info, h)) return FALSE; @@ -3398,6 +3464,7 @@ elf_x86_64_size_dynamic_sections (bfd *output_bfd, abort (); s->size = htab->dynamic_interpreter_size; s->contents = (unsigned char *) htab->dynamic_interpreter; + htab->interp = s; } } @@ -3949,6 +4016,7 @@ elf_x86_64_relocate_section (bfd *output_bfd, int tls_type; asection *base_got, *resolved_plt; bfd_vma st_size; + bfd_boolean resolved_to_zero; r_type = ELF32_R_TYPE (rel->r_info); if (r_type == (int) R_X86_64_GNU_VTINHERIT @@ -4259,6 +4327,9 @@ elf_x86_64_relocate_section (bfd *output_bfd, } } + resolved_to_zero = (eh != NULL + && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh)); + /* When generating a shared object, the relocations handled here are copied into the output file to be resolved at run time. */ switch (r_type) @@ -4539,13 +4610,16 @@ elf_x86_64_relocate_section (bfd *output_bfd, case R_X86_64_PC32: case R_X86_64_PC32_BND: /* Don't complain about -fPIC if the symbol is undefined when - building executable. */ - if (bfd_link_pic (info) - && (input_section->flags & SEC_ALLOC) != 0 + building executable unless it is unresolved weak symbol. */ + if ((input_section->flags & SEC_ALLOC) != 0 && (input_section->flags & SEC_READONLY) != 0 && h != NULL - && !(bfd_link_executable (info) - && h->root.type == bfd_link_hash_undefined)) + && ((bfd_link_executable (info) + && h->root.type == bfd_link_hash_undefweak + && !resolved_to_zero) + || (bfd_link_pic (info) + && !(bfd_link_pie (info) + && h->root.type == bfd_link_hash_undefined)))) { bfd_boolean fail = FALSE; bfd_boolean branch @@ -4559,7 +4633,7 @@ elf_x86_64_relocate_section (bfd *output_bfd, defined locally or for a branch. */ fail = !h->def_regular && !branch; } - else if (!(bfd_link_executable (info) + else if (!(bfd_link_pie (info) && (h->needs_copy || eh->needs_copy))) { /* Symbol doesn't need copy reloc and isn't referenced @@ -4589,17 +4663,19 @@ direct: /* Don't copy a pc-relative relocation into the output file if the symbol needs copy reloc or the symbol is undefined when building executable. Copy dynamic function pointer - relocations. */ + relocations. Don't generate dynamic relocations against + resolved undefined weak symbols in PIE. */ if ((bfd_link_pic (info) - && !(bfd_link_executable (info) + && !(bfd_link_pie (info) && h != NULL && (h->needs_copy || eh->needs_copy || h->root.type == bfd_link_hash_undefined) && IS_X86_64_PCREL_TYPE (r_type)) && (h == NULL - || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) + || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + && !resolved_to_zero) + || h->root.type != bfd_link_hash_undefweak)) && ((! IS_X86_64_PCREL_TYPE (r_type) && r_type != R_X86_64_SIZE32 && r_type != R_X86_64_SIZE64) @@ -4608,7 +4684,10 @@ direct: && !bfd_link_pic (info) && h != NULL && h->dynindx != -1 - && (!h->non_got_ref || eh->func_pointer_refcount > 0) + && (!h->non_got_ref + || eh->func_pointer_refcount > 0 + || (h->root.type == bfd_link_hash_undefweak + && !resolved_to_zero)) && ((h->def_dynamic && !h->def_regular) || h->root.type == bfd_link_hash_undefweak @@ -4647,6 +4726,11 @@ direct: || ! SYMBOLIC_BIND (info, h) || ! h->def_regular)) { + if ((r_type != R_X86_64_PC64 && r_type != R_X86_64_64) + && bfd_link_executable (info) + && h->root.type == bfd_link_hash_undefweak + && !resolved_to_zero) + return elf_x86_64_need_pic (input_bfd, h, howto); outrel.r_info = htab->r_info (h->dynindx, r_type); outrel.r_addend = rel->r_addend; } @@ -5340,12 +5424,13 @@ static bfd_boolean elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, struct bfd_link_info *info, struct elf_link_hash_entry *h, - Elf_Internal_Sym *sym ATTRIBUTE_UNUSED) + Elf_Internal_Sym *sym) { struct elf_x86_64_link_hash_table *htab; const struct elf_x86_64_backend_data *abed; bfd_boolean use_plt_bnd; struct elf_x86_64_link_hash_entry *eh; + bfd_boolean local_undefweak; htab = elf_x86_64_hash_table (info); if (htab == NULL) @@ -5360,6 +5445,11 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, eh = (struct elf_x86_64_link_hash_entry *) h; + /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for + resolved undefined weak symbols in executable so that their + references have value 0 at run-time. */ + local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh); + if (h->plt.offset != (bfd_vma) -1) { bfd_vma plt_index; @@ -5389,6 +5479,7 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, /* This symbol has an entry in the procedure linkage table. Set it up. */ if ((h->dynindx == -1 + && !local_undefweak && !((h->forced_local || bfd_link_executable (info)) && h->def_regular && h->type == STT_GNU_IFUNC)) @@ -5489,60 +5580,67 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, resolved_plt->contents + plt_offset + plt_got_offset); /* Fill in the entry in the global offset table, initially this - points to the second part of the PLT entry. */ - bfd_put_64 (output_bfd, (plt->output_section->vma - + plt->output_offset - + h->plt.offset + abed->plt_lazy_offset), - gotplt->contents + got_offset); - - /* Fill in the entry in the .rela.plt section. */ - rela.r_offset = (gotplt->output_section->vma - + gotplt->output_offset - + got_offset); - if (h->dynindx == -1 - || ((bfd_link_executable (info) - || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) - && h->def_regular - && h->type == STT_GNU_IFUNC)) + points to the second part of the PLT entry. Leave the entry + as zero for undefined weak symbol in PIE. No PLT relocation + against undefined weak symbol in PIE. */ + if (!local_undefweak) { - /* If an STT_GNU_IFUNC symbol is locally defined, generate - R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ - rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); - rela.r_addend = (h->root.u.def.value - + h->root.u.def.section->output_section->vma - + h->root.u.def.section->output_offset); - /* R_X86_64_IRELATIVE comes last. */ - plt_index = htab->next_irelative_index--; - } - else - { - rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); - rela.r_addend = 0; - plt_index = htab->next_jump_slot_index++; - } + bfd_put_64 (output_bfd, (plt->output_section->vma + + plt->output_offset + + h->plt.offset + + abed->plt_lazy_offset), + gotplt->contents + got_offset); + + /* Fill in the entry in the .rela.plt section. */ + rela.r_offset = (gotplt->output_section->vma + + gotplt->output_offset + + got_offset); + if (h->dynindx == -1 + || ((bfd_link_executable (info) + || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) + && h->def_regular + && h->type == STT_GNU_IFUNC)) + { + /* If an STT_GNU_IFUNC symbol is locally defined, generate + R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */ + rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE); + rela.r_addend = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + /* R_X86_64_IRELATIVE comes last. */ + plt_index = htab->next_irelative_index--; + } + else + { + rela.r_info = htab->r_info (h->dynindx, R_X86_64_JUMP_SLOT); + rela.r_addend = 0; + plt_index = htab->next_jump_slot_index++; + } - /* Don't fill PLT entry for static executables. */ - if (plt == htab->elf.splt) - { - bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end; - - /* Put relocation index. */ - bfd_put_32 (output_bfd, plt_index, - plt->contents + h->plt.offset + abed->plt_reloc_offset); - - /* Put offset for jmp .PLT0 and check for overflow. We don't - check relocation index for overflow since branch displacement - will overflow first. */ - if (plt0_offset > 0x80000000) - info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"), - output_bfd, h->root.root.string); - bfd_put_32 (output_bfd, - plt0_offset, - plt->contents + h->plt.offset + plt_plt_offset); - } + /* Don't fill PLT entry for static executables. */ + if (plt == htab->elf.splt) + { + bfd_vma plt0_offset = h->plt.offset + plt_plt_insn_end; + + /* Put relocation index. */ + bfd_put_32 (output_bfd, plt_index, + (plt->contents + h->plt.offset + + abed->plt_reloc_offset)); + + /* Put offset for jmp .PLT0 and check for overflow. We don't + check relocation index for overflow since branch displacement + will overflow first. */ + if (plt0_offset > 0x80000000) + info->callbacks->einfo (_("%F%B: branch displacement overflow in PLT entry for `%s'\n"), + output_bfd, h->root.root.string); + bfd_put_32 (output_bfd, - plt0_offset, + plt->contents + h->plt.offset + plt_plt_offset); + } - bed = get_elf_backend_data (output_bfd); - loc = relplt->contents + plt_index * bed->s->sizeof_rela; - bed->s->swap_reloca_out (output_bfd, &rela, loc); + bed = get_elf_backend_data (output_bfd); + loc = relplt->contents + plt_index * bed->s->sizeof_rela; + bed->s->swap_reloca_out (output_bfd, &rela, loc); + } } else if (eh->plt_got.offset != (bfd_vma) -1) { @@ -5604,7 +5702,8 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, plt->contents + plt_offset + plt_got_offset); } - if (!h->def_regular + if (!local_undefweak + && !h->def_regular && (h->plt.offset != (bfd_vma) -1 || eh->plt_got.offset != (bfd_vma) -1)) { @@ -5621,9 +5720,12 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd, sym->st_value = 0; } + /* Don't generate dynamic GOT relocation against undefined weak + symbol in executable. */ if (h->got.offset != (bfd_vma) -1 && ! GOT_TLS_GD_ANY_P (elf_x86_64_hash_entry (h)->tls_type) - && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE) + && elf_x86_64_hash_entry (h)->tls_type != GOT_TLS_IE + && !local_undefweak) { Elf_Internal_Rela rela; @@ -5729,6 +5831,25 @@ elf_x86_64_finish_local_dynamic_symbol (void **slot, void *inf) info, h, NULL); } +/* Finish up undefined weak symbol handling in PIE. Fill its PLT entry + here since undefined weak symbol may not be dynamic and may not be + called for elf_x86_64_finish_dynamic_symbol. */ + +static bfd_boolean +elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh, + void *inf) +{ + struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh; + struct bfd_link_info *info = (struct bfd_link_info *) inf; + + if (h->root.type != bfd_link_hash_undefweak + || h->dynindx != -1) + return TRUE; + + return elf_x86_64_finish_dynamic_symbol (info->output_bfd, + info, h, NULL); +} + /* Used to decide how to sort relocs in an optimal manner for the dynamic linker, before writing them out. */ @@ -6002,6 +6123,12 @@ elf_x86_64_finish_dynamic_sections (bfd *output_bfd, elf_x86_64_finish_local_dynamic_symbol, info); + /* Fill PLT entries for undefined weak symbols in PIE. */ + if (bfd_link_pie (info)) + bfd_hash_traverse (&info->hash->table, + elf_x86_64_pie_finish_undefweak_symbol, + info); + return TRUE; } @@ -6413,6 +6540,8 @@ static const struct bfd_elf_special_section elf_x86_64_hash_symbol #define elf_backend_omit_section_dynsym \ ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true) +#define elf_backend_fixup_symbol \ + elf_x86_64_fixup_symbol #include "elf64-target.h" |