- && (bfd_link_executable (info)
- || h->type == STT_GNU_IFUNC))
- {
- /* If this reloc is in a read-only section, we might
- need a copy reloc. We can't check reliably at this
- stage whether the section is read-only, as input
- sections have not yet been mapped to output sections.
- Tentatively set the flag for now, and correct in
- adjust_dynamic_symbol. */
- h->non_got_ref = 1;
-
- /* We may need a .plt entry if the symbol is a function
- defined in a shared lib or is a STT_GNU_IFUNC function
- referenced from the code or read-only section. */
- if (!h->def_regular
- || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
- h->plt.refcount += 1;
-
- if (r_type == R_386_PC32)
- {
- /* Since something like ".long foo - ." may be used
- as pointer, make sure that PLT is used if foo is
- a function defined in a shared library. */
- if ((sec->flags & SEC_CODE) == 0)
- h->pointer_equality_needed = 1;
- else if (h->type == STT_GNU_IFUNC
- && bfd_link_pic (info))
- {
- if (isym == NULL)
- name = h->root.root.string;
- else
- name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
- NULL);
- _bfd_error_handler
- /* xgettext:c-format */
- (_("%B: unsupported non-PIC call to IFUNC `%s'"),
- abfd, name);
- bfd_set_error (bfd_error_bad_value);
- goto error_return;
- }
- }
- else
- {
- h->pointer_equality_needed = 1;
- /* R_386_32 can be resolved at run-time. */
- if (r_type == R_386_32
- && (sec->flags & SEC_READONLY) == 0)
- eh->func_pointer_refcount += 1;
- }
- }
-
- size_reloc = FALSE;
-do_size:
- /* If we are creating a shared library, and this is a reloc
- against a global symbol, or a non PC relative reloc
- against a local symbol, then we need to copy the reloc
- into the shared library. However, if we are linking with
- -Bsymbolic, we do not need to copy a reloc against a
- global symbol which is defined in an object we are
- including in the link (i.e., DEF_REGULAR is set). 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). In case of a weak definition,
- DEF_REGULAR may be cleared later by a strong definition in
- a shared library. We account for that possibility below by
- storing information in the relocs_copied field of the hash
- table entry. A similar situation occurs when creating
- shared libraries and symbol visibility changes render the
- symbol local.
-
- If on the other hand, we are creating an executable, we
- may need to keep relocations for symbols satisfied by a
- dynamic library if we manage to avoid copy relocs for the
- symbol.
-
- Generate dynamic pointer relocation against STT_GNU_IFUNC
- symbol in the non-code section. */
- if ((bfd_link_pic (info)
- && (r_type != R_386_PC32
- || (h != NULL
- && (! (bfd_link_pie (info)
- || SYMBOLIC_BIND (info, h))
- || h->root.type == bfd_link_hash_defweak
- || !h->def_regular))))
- || (h != NULL
- && h->type == STT_GNU_IFUNC
- && r_type == R_386_32
- && (sec->flags & SEC_CODE) == 0)
- || (ELIMINATE_COPY_RELOCS
- && !bfd_link_pic (info)
- && h != NULL
- && (h->root.type == bfd_link_hash_defweak
- || !h->def_regular)))
- {
- struct elf_dyn_relocs *p;
- struct elf_dyn_relocs **head;
-
- /* We must copy these reloc types into the output file.
- Create a reloc section in dynobj and make room for
- this reloc. */
- if (sreloc == NULL)
- {
- sreloc = _bfd_elf_make_dynamic_reloc_section
- (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
-
- if (sreloc == NULL)
- goto error_return;
- }
-
- /* If this is a global symbol, we count the number of
- relocations we need for this symbol. */
- if (h != NULL)
- {
- head = &eh->dyn_relocs;
- }
- else
- {
- /* Track dynamic relocs needed for local syms too.
- We really need local syms available to do this
- easily. Oh well. */
- void **vpp;
- asection *s;
-
- isym = bfd_sym_from_r_symndx (&htab->sym_cache,
- abfd, r_symndx);
- if (isym == NULL)
- goto error_return;
-
- s = bfd_section_from_elf_index (abfd, isym->st_shndx);
- if (s == NULL)
- s = sec;
-
- vpp = &elf_section_data (s)->local_dynrel;
- head = (struct elf_dyn_relocs **)vpp;
- }
-
- p = *head;
- if (p == NULL || p->sec != sec)
- {
- bfd_size_type amt = sizeof *p;
- p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
- amt);
- if (p == NULL)
- goto error_return;
- p->next = *head;
- *head = p;
- p->sec = sec;
- p->count = 0;
- p->pc_count = 0;
- }
-
- p->count += 1;
- /* Count size relocation as PC-relative relocation. */
- if (r_type == R_386_PC32 || size_reloc)
- p->pc_count += 1;
- }
- break;
-
- /* This relocation describes the C++ object vtable hierarchy.
- Reconstruct it for later use during GC. */
- case R_386_GNU_VTINHERIT:
- if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
- goto error_return;
- break;
-
- /* This relocation describes which C++ vtable entries are actually
- used. Record for later use during GC. */
- case R_386_GNU_VTENTRY:
- BFD_ASSERT (h != NULL);
- if (h != NULL
- && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
- goto error_return;
- break;
-
- default:
- break;
- }
-
- if (r_type == R_386_GOT32X
- && (h == NULL || h->type != STT_GNU_IFUNC))
- sec->need_convert_load = 1;
- }
-
- if (elf_section_data (sec)->this_hdr.contents != contents)
- {
- if (!info->keep_memory)
- free (contents);
- else
- {
- /* Cache the section contents for elf_link_input_bfd. */
- elf_section_data (sec)->this_hdr.contents = contents;
- }
- }
-
- return TRUE;
-
-error_return:
- if (elf_section_data (sec)->this_hdr.contents != contents)
- free (contents);
- sec->check_relocs_failed = 1;
- return FALSE;
-}
-
-/* Return the section that should be marked against GC for a given
- relocation. */
-
-static asection *
-elf_i386_gc_mark_hook (asection *sec,
- 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:
- return NULL;
- }
-
- return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
-}
-
-/* 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)->has_got_reloc,
- 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
- change the definition to something the rest of the link can
- understand. */
-
-static bfd_boolean
-elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
- struct elf_link_hash_entry *h)
-{
- struct elf_i386_link_hash_table *htab;
- asection *s, *srel;
- struct elf_i386_link_hash_entry *eh;
- struct elf_dyn_relocs *p;
-
- /* STT_GNU_IFUNC symbol must go through PLT. */
- if (h->type == STT_GNU_IFUNC)
- {
- /* All local STT_GNU_IFUNC references must be treate as local
- calls via local PLT. */
- if (h->ref_regular
- && SYMBOL_CALLS_LOCAL (info, h))
- {
- bfd_size_type pc_count = 0, count = 0;
- struct elf_dyn_relocs **pp;
-
- eh = (struct elf_i386_link_hash_entry *) h;
- for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
- {
- pc_count += p->pc_count;
- p->count -= p->pc_count;
- p->pc_count = 0;
- count += p->count;
- if (p->count == 0)
- *pp = p->next;
- else
- pp = &p->next;
- }
-
- if (pc_count || count)
- {
- h->non_got_ref = 1;
- if (pc_count)
- {
- /* Increment PLT reference count only for PC-relative
- references. */
- h->needs_plt = 1;
- if (h->plt.refcount <= 0)
- h->plt.refcount = 1;
- else
- h->plt.refcount += 1;
- }
- }
- }
-
- if (h->plt.refcount <= 0)
- {
- h->plt.offset = (bfd_vma) -1;
- h->needs_plt = 0;
- }
- return TRUE;
- }
-
- /* 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->needs_plt)
- {
- if (h->plt.refcount <= 0
- || SYMBOL_CALLS_LOCAL (info, h)
- || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
- && h->root.type == bfd_link_hash_undefweak))
- {
- /* This case can occur if we saw a PLT32 reloc in an input
- file, but the symbol was never referred to by a dynamic
- object, or if all references were garbage collected. In
- such a case, we don't actually need to build a procedure
- linkage table, and we can just do a PC32 reloc instead. */
- h->plt.offset = (bfd_vma) -1;
- h->needs_plt = 0;
- }
-
- return TRUE;
- }
- else
- /* It's possible that we incorrectly decided a .plt reloc was
- needed for an R_386_PC32 reloc to a non-function sym in
- check_relocs. We can't decide accurately between function and
- non-function syms in check-relocs; Objects loaded later in
- the link may change h->type. So fix it now. */
- 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->u.weakdef != NULL)
- {
- BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
- || h->u.weakdef->root.type == bfd_link_hash_defweak);
- h->root.u.def.section = h->u.weakdef->root.u.def.section;
- h->root.u.def.value = h->u.weakdef->root.u.def.value;
- if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
- h->non_got_ref = h->u.weakdef->non_got_ref;
- 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 (!bfd_link_executable (info))
- return TRUE;
-
- /* If there are no references to this symbol that do not use the
- GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
- reloc. */
- eh = (struct elf_i386_link_hash_entry *) h;
- if (!h->non_got_ref && !eh->gotoff_ref)
- return TRUE;
-
- /* If -z nocopyreloc was given, we won't generate them either. */
- if (info->nocopyreloc)
- {
- h->non_got_ref = 0;
- return TRUE;
- }
-
- htab = elf_i386_hash_table (info);
- if (htab == NULL)
- return FALSE;
-
- /* If there aren't any dynamic relocs in read-only sections nor
- R_386_GOTOFF relocation, then we can keep the dynamic relocs and
- avoid the copy reloc. This doesn't work on VxWorks, where we can
- not have dynamic relocations (other than copy and jump slot
- relocations) in an executable. */
- if (ELIMINATE_COPY_RELOCS
- && !eh->gotoff_ref
- && get_elf_i386_backend_data (info->output_bfd)->os != is_vxworks)
- {
- for (p = eh->dyn_relocs; p != NULL; p = p->next)
- {
- s = p->sec->output_section;
- if (s != NULL && (s->flags & SEC_READONLY) != 0)
- break;
- }
-
- if (p == NULL)
- {
- h->non_got_ref = 0;
- 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. */
-
- /* We must generate a R_386_COPY reloc to tell the dynamic linker to
- copy the initial value out of the dynamic object and into the
- runtime process image. */
- if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
- {
- s = htab->elf.sdynrelro;
- srel = htab->elf.sreldynrelro;
- }
- else
- {
- s = htab->elf.sdynbss;
- srel = htab->elf.srelbss;
- }
- if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
- {
- srel->size += sizeof (Elf32_External_Rel);
- h->needs_copy = 1;
- }
-
- return _bfd_elf_adjust_dynamic_copy (info, h, s);
-}
-
-/* Allocate space in .plt, .got and associated reloc sections for
- dynamic relocs. */
-
-static bfd_boolean
-elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
-{
- struct bfd_link_info *info;
- struct elf_i386_link_hash_table *htab;
- struct elf_i386_link_hash_entry *eh;
- struct elf_dyn_relocs *p;
- unsigned plt_entry_size;
- bfd_boolean resolved_to_zero;
- const struct elf_i386_backend_data *bed;
-
- if (h->root.type == bfd_link_hash_indirect)
- return TRUE;
-
- eh = (struct elf_i386_link_hash_entry *) h;
-
- info = (struct bfd_link_info *) inf;
- htab = elf_i386_hash_table (info);
- if (htab == NULL)
- return FALSE;
-
- bed = get_elf_i386_backend_data (info->output_bfd);
-
- plt_entry_size = htab->plt.plt_entry_size;
-
- resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
- eh->has_got_reloc,
- eh);
-
- /* Clear the reference count of function pointer relocations if
- symbol isn't a normal function. */
- if (h->type != STT_FUNC)
- eh->func_pointer_refcount = 0;
-
- /* 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
- loop at run-time. */
- if (htab->plt_got != NULL
- && h->type != STT_GNU_IFUNC
- && !h->pointer_equality_needed
- && h->plt.refcount > 0
- && h->got.refcount > 0)
- {
- /* Don't use the regular PLT if there are both GOT and GOTPLT
- reloctions. */
- h->plt.offset = (bfd_vma) -1;
-
- /* Use the GOT PLT. */
- eh->plt_got.refcount = 1;
- }
-
- /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
- here if it is defined and referenced in a non-shared object. */
- if (h->type == STT_GNU_IFUNC
- && h->def_regular)
- return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
- &htab->readonly_dynrelocs_against_ifunc,
- plt_entry_size,
- (htab->plt.has_plt0 *
- plt_entry_size),
- 4, TRUE);
- /* Don't create the PLT entry if there are only function pointer
- relocations which can be resolved at run-time. */
- else if (htab->elf.dynamic_sections_created
- && (h->plt.refcount > eh->func_pointer_refcount
- || eh->plt_got.refcount > 0))
- {
- bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
-
- /* Clear the reference count of function pointer relocations
- if PLT is used. */
- eh->func_pointer_refcount = 0;
-
- /* 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
- && !resolved_to_zero
- && h->root.type == bfd_link_hash_undefweak)
- {
- if (! bfd_elf_link_record_dynamic_symbol (info, h))
- return FALSE;
- }
-
- if (bfd_link_pic (info)
- || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
- {
- asection *s = htab->elf.splt;
- asection *got_s = htab->plt_got;
-
- /* If this is the first .plt entry, make room for the special
- first entry. The .plt section is used by prelink to undo
- prelinking for dynamic relocations. */
- if (s->size == 0)
- s->size = htab->plt.has_plt0 * plt_entry_size;
-
- if (use_plt_got)
- eh->plt_got.offset = got_s->size;
- else
- h->plt.offset = s->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 (! bfd_link_pic (info)
- && !h->def_regular)
- {
- if (use_plt_got)
- {
- /* We need to make a call to the entry of the GOT PLT
- instead of regular PLT entry. */
- h->root.u.def.section = got_s;
- h->root.u.def.value = eh->plt_got.offset;
- }
- else
- {
- h->root.u.def.section = s;
- h->root.u.def.value = h->plt.offset;
- }
- }
-
- /* Make room for this entry. */
- if (use_plt_got)
- got_s->size += htab->non_lazy_plt->plt_entry_size;
- else
- {
- s->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. */
- htab->elf.sgotplt->size += 4;
-
- /* 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 (bed->os == is_vxworks && !bfd_link_pic (info))
- {
- /* VxWorks has a second set of relocations for each PLT entry
- in executables. They go in a separate relocation section,
- which is processed by the kernel loader. */
-
- /* There are two relocations for the initial PLT entry: an
- R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
- R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
-
- if (h->plt.offset == plt_entry_size)
- htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
-
- /* There are two extra relocations for each subsequent PLT entry:
- an R_386_32 relocation for the GOT entry, and an R_386_32
- relocation for the PLT entry. */
-
- htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
- }
- }
- else
- {
- eh->plt_got.offset = (bfd_vma) -1;
- h->plt.offset = (bfd_vma) -1;
- h->needs_plt = 0;
- }
- }
- else
- {
- eh->plt_got.offset = (bfd_vma) -1;
- h->plt.offset = (bfd_vma) -1;
- h->needs_plt = 0;
- }
-
- eh->tlsdesc_got = (bfd_vma) -1;
-
- /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
- make it a R_386_TLS_LE_32 requiring no TLS entry. */
- if (h->got.refcount > 0
- && bfd_link_executable (info)
- && h->dynindx == -1
- && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
- h->got.offset = (bfd_vma) -1;
- else if (h->got.refcount > 0)
- {
- asection *s;
- bfd_boolean dyn;
- int tls_type = elf_i386_hash_entry(h)->tls_type;
-
- /* 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
- && !resolved_to_zero
- && h->root.type == bfd_link_hash_undefweak)
- {
- if (! bfd_elf_link_record_dynamic_symbol (info, h))
- return FALSE;
- }
-
- s = htab->elf.sgot;
- if (GOT_TLS_GDESC_P (tls_type))
- {
- eh->tlsdesc_got = htab->elf.sgotplt->size
- - elf_i386_compute_jump_table_size (htab);
- htab->elf.sgotplt->size += 8;
- h->got.offset = (bfd_vma) -2;
- }
- if (! GOT_TLS_GDESC_P (tls_type)
- || GOT_TLS_GD_P (tls_type))
- {
- h->got.offset = s->size;
- s->size += 4;
- /* R_386_TLS_GD needs 2 consecutive GOT slots. */
- if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
- s->size += 4;
- }
- dyn = htab->elf.dynamic_sections_created;
- /* R_386_TLS_IE_32 needs one dynamic relocation,
- 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. 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)
- || (tls_type & GOT_TLS_IE))
- htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
- 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
- && !resolved_to_zero)
- || h->root.type != bfd_link_hash_undefweak)
- && (bfd_link_pic (info)
- || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
- htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
- if (GOT_TLS_GDESC_P (tls_type))
- htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
- }
- else
- h->got.offset = (bfd_vma) -1;
-
- if (eh->dyn_relocs == NULL)
- return TRUE;
-
- /* 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 pc-relative relocs that have become local due to symbol
- visibility changes. */
-
- if (bfd_link_pic (info))
- {
- /* The only reloc that uses pc_count is R_386_PC32, which will
- appear on a call or on something like ".long foo - .". We
- want calls to protected symbols to resolve directly to the
- function rather than going via the plt. If people want
- function pointer comparisons to work as expected then they
- should avoid writing assembly like ".long foo - .". */
- if (SYMBOL_CALLS_LOCAL (info, h))
- {
- struct elf_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;
- }
- }
-
- if (bed->os == is_vxworks)
- {
- struct elf_dyn_relocs **pp;
- for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
- {
- if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
- *pp = p->next;
- else
- pp = &p->next;
- }
- }
-
- /* Also discard relocs on undefined weak syms with non-default
- visibility or in PIE. */
- if (eh->dyn_relocs != NULL
- && h->root.type == bfd_link_hash_undefweak)
- {
- /* 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;
- }
-
- 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)
- {
- if (! bfd_elf_link_record_dynamic_symbol (info, h))
- return FALSE;
- }
- }
- }
- else if (ELIMINATE_COPY_RELOCS)
- {
- /* For the non-shared case, discard space for relocs against
- symbols which turn out to need copy relocs or are not
- dynamic. Keep dynamic relocations for run-time function
- pointer initialization. */
-
- 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
- && (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->forced_local
- && !resolved_to_zero
- && h->root.type == bfd_link_hash_undefweak)
- {
- if (! bfd_elf_link_record_dynamic_symbol (info, h))
- return FALSE;
- }
-
- /* If that succeeded, we know we'll be keeping all the
- relocs. */
- if (h->dynindx != -1)
- goto keep;
- }
-
- eh->dyn_relocs = NULL;
- eh->func_pointer_refcount = 0;
-
- keep: ;
- }
-
- /* Finally, allocate space. */
- for (p = eh->dyn_relocs; p != NULL; p = p->next)
- {
- asection *sreloc;
-
- sreloc = elf_section_data (p->sec)->sreloc;
-
- BFD_ASSERT (sreloc != NULL);
- sreloc->size += p->count * sizeof (Elf32_External_Rel);
- }
-
- return TRUE;
-}
-
-/* Allocate space in .plt, .got and associated reloc sections for
- local dynamic relocs. */
-
-static bfd_boolean
-elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
-{
- struct elf_link_hash_entry *h
- = (struct elf_link_hash_entry *) *slot;
-
- if (h->type != STT_GNU_IFUNC
- || !h->def_regular
- || !h->ref_regular
- || !h->forced_local
- || h->root.type != bfd_link_hash_defined)
- abort ();
-
- return elf_i386_allocate_dynrelocs (h, inf);
-}
-
-/* Find any dynamic relocs that apply to read-only sections. */
-
-static bfd_boolean
-elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
-{
- struct elf_i386_link_hash_entry *eh;
- struct elf_dyn_relocs *p;
-
- /* Skip local IFUNC symbols. */
- if (h->forced_local && h->type == STT_GNU_IFUNC)
- return TRUE;
-
- 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;
-
- if ((info->warn_shared_textrel && bfd_link_pic (info))
- || info->error_textrel)
- /* xgettext:c-format */
- info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
- p->sec->owner, h->root.root.string,
- p->sec);
-
- /* Not an error, just cut short the traversal. */
- return FALSE;
- }
- }
- return TRUE;
-}
-
-/* Convert load via the GOT slot to load immediate. */
-
-static bfd_boolean
-elf_i386_convert_load (bfd *abfd, asection *sec,
- struct bfd_link_info *link_info)
-{
- struct elf_i386_link_hash_table *htab;
- Elf_Internal_Shdr *symtab_hdr;
- Elf_Internal_Rela *internal_relocs;
- Elf_Internal_Rela *irel, *irelend;
- bfd_byte *contents;
- bfd_boolean changed;
- bfd_signed_vma *local_got_refcounts;
-
- /* Don't even try to convert non-ELF outputs. */
- if (!is_elf_hash_table (link_info->hash))
- return FALSE;
-
- /* Nothing to do if there is no need or no output. */
- if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
- || sec->need_convert_load == 0
- || bfd_is_abs_section (sec->output_section))
- return TRUE;
-
- symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
-
- /* Load the relocations for this section. */
- internal_relocs = (_bfd_elf_link_read_relocs
- (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
- link_info->keep_memory));
- if (internal_relocs == NULL)
- return FALSE;
-
- changed = FALSE;
- htab = elf_i386_hash_table (link_info);
- local_got_refcounts = elf_local_got_refcounts (abfd);
-
- /* Get the section contents. */
- if (elf_section_data (sec)->this_hdr.contents != NULL)
- contents = elf_section_data (sec)->this_hdr.contents;
- else
- {
- if (!bfd_malloc_and_get_section (abfd, sec, &contents))
- goto error_return;
- }
-
- irelend = internal_relocs + sec->reloc_count;
- for (irel = internal_relocs; irel < irelend; irel++)
- {
- unsigned int r_type = ELF32_R_TYPE (irel->r_info);
- unsigned int r_symndx;
- struct elf_link_hash_entry *h;
- bfd_boolean converted;
-
- /* Don't convert R_386_GOT32 since we can't tell if it is applied
- to "mov $foo@GOT, %reg" which isn't a load via GOT. */
- if (r_type != R_386_GOT32X)
- continue;
-
- r_symndx = ELF32_R_SYM (irel->r_info);
- if (r_symndx < symtab_hdr->sh_info)
- h = elf_i386_get_local_sym_hash (htab, sec->owner,
- (const Elf_Internal_Rela *) irel,
- FALSE);
- else
- {
- h = elf_sym_hashes (abfd)[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;
- }
-
- /* STT_GNU_IFUNC must keep GOT32 relocations. */
- if (h != NULL && h->type == STT_GNU_IFUNC)
- continue;
-
- converted = FALSE;
- if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
- irel, h, &converted, link_info))
- goto error_return;
-
- if (converted)
- {
- changed = converted;
- if (h)
- {
- if (h->got.refcount > 0)
- h->got.refcount -= 1;
- }
- else
- {
- if (local_got_refcounts != NULL
- && local_got_refcounts[r_symndx] > 0)
- local_got_refcounts[r_symndx] -= 1;
- }
- }
- }
-
- if (contents != NULL
- && elf_section_data (sec)->this_hdr.contents != contents)
- {
- if (!changed && !link_info->keep_memory)
- free (contents);
- else
- {
- /* Cache the section contents for elf_link_input_bfd. */
- elf_section_data (sec)->this_hdr.contents = contents;
- }
- }
-
- if (elf_section_data (sec)->relocs != internal_relocs)
- {
- if (!changed)
- free (internal_relocs);
- else
- elf_section_data (sec)->relocs = internal_relocs;
- }
-
- return TRUE;
-
- error_return:
- if (contents != NULL
- && elf_section_data (sec)->this_hdr.contents != contents)
- free (contents);
- if (internal_relocs != NULL
- && elf_section_data (sec)->relocs != internal_relocs)
- free (internal_relocs);
- return FALSE;
-}
-
-/* Set the sizes of the dynamic sections. */
-
-static bfd_boolean
-elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
-{
- struct elf_i386_link_hash_table *htab;
- bfd *dynobj;
- asection *s;
- bfd_boolean relocs;
- bfd *ibfd;
-
- htab = elf_i386_hash_table (info);
- if (htab == NULL)
- return FALSE;
- dynobj = htab->elf.dynobj;
- if (dynobj == NULL)
- abort ();
-
- /* 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;
- char *local_tls_type;
- bfd_vma *local_tlsdesc_gotent;
- bfd_size_type locsymcount;
- Elf_Internal_Shdr *symtab_hdr;
- asection *srel;
-
- if (! is_i386_elf (ibfd))
- continue;
-
- for (s = ibfd->sections; s != NULL; s = s->next)
- {
- struct elf_dyn_relocs *p;
-
- if (!elf_i386_convert_load (ibfd, s, info))
- return FALSE;
-
- for (p = ((struct elf_dyn_relocs *)
- elf_section_data (s)->local_dynrel);
- p != NULL;
- p = p->next)
- {
- if (!bfd_is_abs_section (p->sec)
- && bfd_is_abs_section (p->sec->output_section))
- {
- /* Input section has been discarded, either because
- it is a copy of a linkonce section or due to
- linker script /DISCARD/, so we'll be discarding
- the relocs too. */
- }
- else if ((get_elf_i386_backend_data (output_bfd)->os
- == is_vxworks)
- && strcmp (p->sec->output_section->name,
- ".tls_vars") == 0)
- {
- /* Relocations in vxworks .tls_vars sections are
- handled specially by the loader. */
- }
- else if (p->count != 0)
- {
- srel = elf_section_data (p->sec)->sreloc;
- srel->size += p->count * sizeof (Elf32_External_Rel);
- if ((p->sec->output_section->flags & SEC_READONLY) != 0
- && (info->flags & DF_TEXTREL) == 0)
- {
- info->flags |= DF_TEXTREL;
- if ((info->warn_shared_textrel && bfd_link_pic (info))
- || info->error_textrel)
- /* xgettext:c-format */
- info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
- p->sec->owner, p->sec);
- }
- }
- }
- }
-
- local_got = elf_local_got_refcounts (ibfd);
- if (!local_got)
- continue;
-
- symtab_hdr = &elf_symtab_hdr (ibfd);
- locsymcount = symtab_hdr->sh_info;
- end_local_got = local_got + locsymcount;
- local_tls_type = elf_i386_local_got_tls_type (ibfd);
- local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
- s = htab->elf.sgot;
- srel = htab->elf.srelgot;
- for (; local_got < end_local_got;
- ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
- {
- *local_tlsdesc_gotent = (bfd_vma) -1;
- if (*local_got > 0)
- {
- if (GOT_TLS_GDESC_P (*local_tls_type))
- {
- *local_tlsdesc_gotent = htab->elf.sgotplt->size
- - elf_i386_compute_jump_table_size (htab);
- htab->elf.sgotplt->size += 8;
- *local_got = (bfd_vma) -2;
- }
- if (! GOT_TLS_GDESC_P (*local_tls_type)
- || GOT_TLS_GD_P (*local_tls_type))
- {
- *local_got = s->size;
- s->size += 4;
- if (GOT_TLS_GD_P (*local_tls_type)
- || *local_tls_type == GOT_TLS_IE_BOTH)
- s->size += 4;
- }
- if (bfd_link_pic (info)
- || GOT_TLS_GD_ANY_P (*local_tls_type)
- || (*local_tls_type & GOT_TLS_IE))
- {
- if (*local_tls_type == GOT_TLS_IE_BOTH)
- srel->size += 2 * sizeof (Elf32_External_Rel);
- else if (GOT_TLS_GD_P (*local_tls_type)
- || ! GOT_TLS_GDESC_P (*local_tls_type))
- srel->size += sizeof (Elf32_External_Rel);
- if (GOT_TLS_GDESC_P (*local_tls_type))
- htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
- }
- }
- else
- *local_got = (bfd_vma) -1;
- }
- }
-
- if (htab->tls_ldm_got.refcount > 0)
- {
- /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
- relocs. */
- htab->tls_ldm_got.offset = htab->elf.sgot->size;
- htab->elf.sgot->size += 8;
- htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
- }
- else
- htab->tls_ldm_got.offset = -1;
-
- /* Allocate global sym .plt and .got entries, and space for global
- sym dynamic relocs. */
- elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
-
- /* Allocate .plt and .got entries, and space for local symbols. */
- htab_traverse (htab->loc_hash_table,
- elf_i386_allocate_local_dynrelocs,
- info);
-
- /* For every jump slot reserved in the sgotplt, reloc_count is
- incremented. However, when we reserve space for TLS descriptors,
- it's not incremented, so in order to compute the space reserved
- for them, it suffices to multiply the reloc count by the jump
- slot size.
-
- PR ld/13302: We start next_irelative_index at the end of .rela.plt
- so that R_386_IRELATIVE entries come last. */
- if (htab->elf.srelplt)
- {
- htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
- htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
- htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
- }
- else if (htab->elf.irelplt)
- htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
-
-
- if (htab->elf.sgotplt)
- {
- /* Don't allocate .got.plt section if there are no GOT nor PLT
- entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
- if ((htab->elf.hgot == NULL
- || !htab->elf.hgot->ref_regular_nonweak)
- && (htab->elf.sgotplt->size
- == get_elf_backend_data (output_bfd)->got_header_size)
- && (htab->elf.splt == NULL
- || htab->elf.splt->size == 0)
- && (htab->elf.sgot == NULL
- || htab->elf.sgot->size == 0)
- && (htab->elf.iplt == NULL
- || htab->elf.iplt->size == 0)
- && (htab->elf.igotplt == NULL
- || htab->elf.igotplt->size == 0))
- htab->elf.sgotplt->size = 0;
- }
-
- if (_bfd_elf_eh_frame_present (info))
- {
- if (htab->plt_eh_frame != NULL
- && htab->elf.splt != NULL
- && htab->elf.splt->size != 0
- && !bfd_is_abs_section (htab->elf.splt->output_section))
- htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
-
- if (htab->plt_got_eh_frame != NULL
- && htab->plt_got != NULL
- && htab->plt_got->size != 0
- && !bfd_is_abs_section (htab->plt_got->output_section))
- htab->plt_got_eh_frame->size
- = htab->non_lazy_plt->eh_frame_plt_size;
- }
-
- /* We now have determined the sizes of the various dynamic sections.
- Allocate memory for them. */
- relocs = FALSE;
- for (s = dynobj->sections; s != NULL; s = s->next)
- {
- bfd_boolean strip_section = TRUE;
-
- if ((s->flags & SEC_LINKER_CREATED) == 0)
- continue;
-
- if (s == htab->elf.splt
- || s == htab->elf.sgot)
- {
- /* Strip this section if we don't need it; see the
- comment below. */
- /* We'd like to strip these sections if they aren't needed, but if
- we've exported dynamic symbols from them we must leave them.
- It's too late to tell BFD to get rid of the symbols. */
-
- if (htab->elf.hplt != NULL)
- strip_section = FALSE;
- }
- else if (s == htab->elf.sgotplt
- || s == htab->elf.iplt
- || s == htab->elf.igotplt
- || s == htab->plt_got
- || s == htab->plt_eh_frame
- || s == htab->plt_got_eh_frame
- || s == htab->elf.sdynbss
- || s == htab->elf.sdynrelro)
- {
- /* Strip these too. */
- }
- else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
- {
- if (s->size != 0
- && s != htab->elf.srelplt
- && s != htab->srelplt2)
- relocs = 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
- {
- /* It's not one of our sections, so don't allocate space. */
- continue;
- }
-
- if (s->size == 0)
- {
- /* If we don't need this section, strip it from the
- output file. This is mostly to handle .rel.bss and
- .rel.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. */
- if (strip_section)
- s->flags |= SEC_EXCLUDE;
- continue;
- }
-
- if ((s->flags & SEC_HAS_CONTENTS) == 0)
- continue;
projects / deliverable / binutils-gdb.git / blobdiff