/* x86 specific support for ELF
- Copyright (C) 2017 Free Software Foundation, Inc.
+ Copyright (C) 2017-2019 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
#define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
#define ELFX32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
+bfd_boolean
+_bfd_x86_elf_mkobject (bfd *abfd)
+{
+ return bfd_elf_allocate_object (abfd,
+ sizeof (struct elf_x86_obj_tdata),
+ get_elf_backend_data (abfd)->target_id);
+}
+
/* _TLS_MODULE_BASE_ needs to be treated especially when linking
executables. Rather than setting it to the beginning of the TLS
section, we have to set it to the end. This function may be called
return elf_hash_table (info)->tls_sec->vma;
}
-/* Find any dynamic relocs that apply to read-only sections. */
+/* Allocate space in .plt, .got and associated reloc sections for
+ dynamic relocs. */
-bfd_boolean
-_bfd_x86_elf_readonly_dynrelocs (struct elf_link_hash_entry *h,
- void *inf)
+static bfd_boolean
+elf_x86_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
{
+ struct bfd_link_info *info;
+ struct elf_x86_link_hash_table *htab;
struct elf_x86_link_hash_entry *eh;
struct elf_dyn_relocs *p;
+ unsigned int plt_entry_size;
+ bfd_boolean resolved_to_zero;
+ const struct elf_backend_data *bed;
- /* Skip local IFUNC symbols. */
- if (h->forced_local && h->type == STT_GNU_IFUNC)
+ if (h->root.type == bfd_link_hash_indirect)
return TRUE;
eh = (struct elf_x86_link_hash_entry *) h;
+
+ info = (struct bfd_link_info *) inf;
+ bed = get_elf_backend_data (info->output_bfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab == NULL)
+ return FALSE;
+
+ plt_entry_size = htab->plt.plt_entry_size;
+
+ 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
+ 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)
+ {
+ if (_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),
+ htab->got_entry_size,
+ TRUE))
+ {
+ asection *s = htab->plt_second;
+ if (h->plt.offset != (bfd_vma) -1 && s != NULL)
+ {
+ /* Use the second PLT section if it is created. */
+ eh->plt_second.offset = s->size;
+
+ /* Make room for this entry in the second PLT section. */
+ s->size += htab->non_lazy_plt->plt_entry_size;
+ }
+
+ return TRUE;
+ }
+ else
+ return FALSE;
+ }
+ /* 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 > 0
+ || eh->plt_got.refcount > 0))
+ {
+ bfd_boolean use_plt_got = eh->plt_got.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 *second_s = htab->plt_second;
+ asection *got_s = htab->plt_got;
+ bfd_boolean use_plt;
+
+ /* 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 (second_s)
+ eh->plt_second.offset = second_s->size;
+ }
+
+ /* If this symbol is not defined in a regular file, and we are
+ generating PDE, then set the symbol to this location in the
+ .plt. This is required to make function pointers compare
+ as equal between PDE and the shared library.
+
+ NB: If PLT is PC-relative, we can use the .plt in PIE for
+ function address. */
+ if (h->def_regular)
+ use_plt = FALSE;
+ else if (htab->pcrel_plt)
+ use_plt = ! bfd_link_dll (info);
+ else
+ use_plt = bfd_link_pde (info);
+ if (use_plt)
+ {
+ 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
+ {
+ if (second_s)
+ {
+ /* We need to make a call to the entry of the
+ second PLT instead of regular PLT entry. */
+ h->root.u.def.section = second_s;
+ h->root.u.def.value = eh->plt_second.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;
+ if (second_s)
+ second_s->size += htab->non_lazy_plt->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 += htab->got_entry_size;
+
+ /* 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 += htab->sizeof_reloc;
+ htab->elf.srelplt->reloc_count++;
+ }
+ }
+
+ if (htab->target_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. */
+
+ asection *srelplt2 = htab->srelplt2;
+ if (h->plt.offset == plt_entry_size)
+ srelplt2->size += (htab->sizeof_reloc * 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. */
+
+ srelplt2->size += (htab->sizeof_reloc * 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;
+
+ /* For i386, 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. For
+ x86-64, if R_X86_64_GOTTPOFF symbol is now local to the binary,
+ make it a R_X86_64_TPOFF32 requiring no GOT entry. */
+ if (h->got.refcount > 0
+ && bfd_link_executable (info)
+ && h->dynindx == -1
+ && (elf_x86_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_x86_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_x86_compute_jump_table_size (htab);
+ htab->elf.sgotplt->size += 2 * htab->got_entry_size;
+ 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 += htab->got_entry_size;
+ /* R_386_TLS_GD and R_X86_64_TLSGD need 2 consecutive GOT
+ slots. */
+ if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
+ s->size += htab->got_entry_size;
+ }
+ 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 and R_X86_64_TLSGD need 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 * htab->sizeof_reloc;
+ else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
+ || (tls_type & GOT_TLS_IE))
+ htab->elf.srelgot->size += htab->sizeof_reloc;
+ else if (GOT_TLS_GD_P (tls_type))
+ htab->elf.srelgot->size += 2 * htab->sizeof_reloc;
+ 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 += htab->sizeof_reloc;
+ if (GOT_TLS_GDESC_P (tls_type))
+ {
+ htab->elf.srelplt->size += htab->sizeof_reloc;
+ if (bed->target_id == X86_64_ELF_DATA)
+ htab->tlsdesc_plt = (bfd_vma) -1;
+ }
+ }
+ 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))
+ {
+ /* Relocs that use pc_count are those that appear on a call
+ insn, or certain REL relocs that can generated via assembly.
+ 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 weird assembly. */
+ 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 (htab->target_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)
+ {
+ if (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 (bed->target_id == I386_ELF_DATA
+ && 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 dynamic symbols in PIEs for dynamic non-GOT
+ non-PLT reloations. */
+ if (eh->dyn_relocs != NULL
+ && !bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+ else
+ eh->dyn_relocs = NULL;
+ }
+ else if (h->dynindx == -1
+ && !h->forced_local
+ && !bfd_elf_link_record_dynamic_symbol (info, h))
+ return FALSE;
+ }
+ else if (bfd_link_executable (info)
+ && (h->needs_copy || eh->needs_copy)
+ && h->def_dynamic
+ && !h->def_regular)
+ {
+ /* NB: needs_copy is set only for x86-64. For PIE,
+ discard space for pc-relative relocs against symbols
+ which turn out to need copy relocs. */
+ struct elf_dyn_relocs **pp;
+
+ for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
+ {
+ if (p->pc_count != 0)
+ *pp = p->next;
+ else
+ pp = &p->next;
+ }
+ }
+ }
+ }
+ 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
+ || (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
+ && ! 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;
+
+ 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 * htab->sizeof_reloc;
+ }
+
+ return TRUE;
+}
+
+/* Find dynamic relocs for H that apply to read-only sections. */
+
+static asection *
+readonly_dynrelocs (struct elf_link_hash_entry *h)
+{
+ struct elf_dyn_relocs *p;
+
+ for (p = elf_x86_hash_entry (h)->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;
+ return p->sec;
+ }
+ return NULL;
+}
- info->flags |= DF_TEXTREL;
+/* Set DF_TEXTREL if we find any dynamic relocs that apply to
+ read-only sections. */
- 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);
+static bfd_boolean
+maybe_set_textrel (struct elf_link_hash_entry *h, void *inf)
+{
+ asection *sec;
- /* Not an error, just cut short the traversal. */
- return FALSE;
- }
+ if (h->root.type == bfd_link_hash_indirect)
+ return TRUE;
+
+ /* Skip local IFUNC symbols. */
+ if (h->forced_local && h->type == STT_GNU_IFUNC)
+ return TRUE;
+
+ sec = readonly_dynrelocs (h);
+ if (sec != NULL)
+ {
+ struct bfd_link_info *info = (struct bfd_link_info *) inf;
+
+ info->flags |= DF_TEXTREL;
+ /* xgettext:c-format */
+ info->callbacks->minfo (_("%pB: dynamic relocation against `%pT' "
+ "in read-only section `%pA'\n"),
+ sec->owner, h->root.root.string, sec);
+
+ if ((info->warn_shared_textrel && bfd_link_pic (info))
+ || info->error_textrel)
+ /* xgettext:c-format */
+ info->callbacks->einfo (_("%P: %pB: warning: relocation against `%s' "
+ "in read-only section `%pA'\n"),
+ sec->owner, h->root.root.string, sec);
+
+ /* Not an error, just cut short the traversal. */
+ return FALSE;
}
return TRUE;
}
+/* Allocate space in .plt, .got and associated reloc sections for
+ local dynamic relocs. */
+
+static bfd_boolean
+elf_x86_allocate_local_dynreloc (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_x86_allocate_dynrelocs (h, inf);
+}
+
/* Find and/or create a hash entry for local symbol. */
struct elf_link_hash_entry *
eh->plt_second.offset = (bfd_vma) -1;
eh->plt_got.offset = (bfd_vma) -1;
eh->tlsdesc_got = (bfd_vma) -1;
+ eh->zero_undefweak = 1;
}
return entry;
_bfd_elf_link_hash_table_free (obfd);
}
+static bfd_boolean
+elf_i386_is_reloc_section (const char *secname)
+{
+ return CONST_STRNEQ (secname, ".rel");
+}
+
+static bfd_boolean
+elf_x86_64_is_reloc_section (const char *secname)
+{
+ return CONST_STRNEQ (secname, ".rela");
+}
+
/* Create an x86 ELF linker hash table. */
struct bfd_link_hash_table *
return NULL;
}
-#ifdef BFD64
+ if (bed->target_id == X86_64_ELF_DATA)
+ {
+ ret->is_reloc_section = elf_x86_64_is_reloc_section;
+ ret->dt_reloc = DT_RELA;
+ ret->dt_reloc_sz = DT_RELASZ;
+ ret->dt_reloc_ent = DT_RELAENT;
+ ret->got_entry_size = 8;
+ ret->pcrel_plt = TRUE;
+ ret->tls_get_addr = "__tls_get_addr";
+ }
if (ABI_64_P (abfd))
{
- ret->r_info = elf64_r_info;
- ret->r_sym = elf64_r_sym;
+ ret->sizeof_reloc = sizeof (Elf64_External_Rela);
ret->pointer_r_type = R_X86_64_64;
ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
- ret->tls_get_addr = "__tls_get_addr";
}
else
-#endif
{
- ret->r_info = elf32_r_info;
- ret->r_sym = elf32_r_sym;
if (bed->target_id == X86_64_ELF_DATA)
{
+ ret->sizeof_reloc = sizeof (Elf32_External_Rela);
ret->pointer_r_type = R_X86_64_32;
ret->dynamic_interpreter = ELFX32_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size
= sizeof ELFX32_DYNAMIC_INTERPRETER;
- ret->tls_get_addr = "__tls_get_addr";
}
else
{
+ ret->is_reloc_section = elf_i386_is_reloc_section;
+ ret->dt_reloc = DT_REL;
+ ret->dt_reloc_sz = DT_RELSZ;
+ ret->dt_reloc_ent = DT_RELENT;
+ ret->sizeof_reloc = sizeof (Elf32_External_Rel);
+ ret->got_entry_size = 4;
+ ret->pcrel_plt = FALSE;
ret->pointer_r_type = R_386_32;
ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size
ret->tls_get_addr = "___tls_get_addr";
}
}
+ ret->target_id = bed->target_id;
+ ret->target_os = get_elf_x86_backend_data (abfd)->target_os;
ret->loc_hash_table = htab_try_create (1024,
_bfd_x86_elf_local_htab_hash,
return 0;
}
-bfd_boolean
-_bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
-{
- if (!bfd_link_relocatable (info))
+/* Mark symbol, NAME, as locally defined by linker if it is referenced
+ and not defined in a relocatable object file. */
+
+static void
+elf_x86_linker_defined (struct bfd_link_info *info, const char *name)
+{
+ struct elf_link_hash_entry *h;
+
+ h = elf_link_hash_lookup (elf_hash_table (info), name,
+ FALSE, FALSE, FALSE);
+ if (h == NULL)
+ return;
+
+ while (h->root.type == bfd_link_hash_indirect)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+ if (h->root.type == bfd_link_hash_new
+ || h->root.type == bfd_link_hash_undefined
+ || h->root.type == bfd_link_hash_undefweak
+ || h->root.type == bfd_link_hash_common
+ || (!h->def_regular && h->def_dynamic))
+ {
+ elf_x86_hash_entry (h)->local_ref = 2;
+ elf_x86_hash_entry (h)->linker_def = 1;
+ }
+}
+
+/* Hide a linker-defined symbol, NAME, with hidden visibility. */
+
+static void
+elf_x86_hide_linker_defined (struct bfd_link_info *info,
+ const char *name)
+{
+ struct elf_link_hash_entry *h;
+
+ h = elf_link_hash_lookup (elf_hash_table (info), name,
+ FALSE, FALSE, FALSE);
+ if (h == NULL)
+ return;
+
+ while (h->root.type == bfd_link_hash_indirect)
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+
+ if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
+ || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
+ _bfd_elf_link_hash_hide_symbol (info, h, TRUE);
+}
+
+bfd_boolean
+_bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
+{
+ if (!bfd_link_relocatable (info))
+ {
+ /* Check for __tls_get_addr reference. */
+ struct elf_x86_link_hash_table *htab;
+ const struct elf_backend_data *bed = get_elf_backend_data (abfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab)
+ {
+ struct elf_link_hash_entry *h;
+
+ h = elf_link_hash_lookup (elf_hash_table (info),
+ htab->tls_get_addr,
+ FALSE, FALSE, FALSE);
+ if (h != NULL)
+ {
+ elf_x86_hash_entry (h)->tls_get_addr = 1;
+
+ /* Check the versioned __tls_get_addr symbol. */
+ while (h->root.type == bfd_link_hash_indirect)
+ {
+ h = (struct elf_link_hash_entry *) h->root.u.i.link;
+ elf_x86_hash_entry (h)->tls_get_addr = 1;
+ }
+ }
+
+ /* "__ehdr_start" will be defined by linker as a hidden symbol
+ later if it is referenced and not defined. */
+ elf_x86_linker_defined (info, "__ehdr_start");
+
+ if (bfd_link_executable (info))
+ {
+ /* References to __bss_start, _end and _edata should be
+ locally resolved within executables. */
+ elf_x86_linker_defined (info, "__bss_start");
+ elf_x86_linker_defined (info, "_end");
+ elf_x86_linker_defined (info, "_edata");
+ }
+ else
+ {
+ /* Hide hidden __bss_start, _end and _edata in shared
+ libraries. */
+ elf_x86_hide_linker_defined (info, "__bss_start");
+ elf_x86_hide_linker_defined (info, "_end");
+ elf_x86_hide_linker_defined (info, "_edata");
+ }
+ }
+ }
+
+ /* Invoke the regular ELF backend linker to do all the work. */
+ return _bfd_elf_link_check_relocs (abfd, info);
+}
+
+/* Set the sizes of the dynamic sections. */
+
+bfd_boolean
+_bfd_x86_elf_size_dynamic_sections (bfd *output_bfd,
+ struct bfd_link_info *info)
+{
+ struct elf_x86_link_hash_table *htab;
+ bfd *dynobj;
+ asection *s;
+ bfd_boolean relocs;
+ bfd *ibfd;
+ const struct elf_backend_data *bed
+ = get_elf_backend_data (output_bfd);
+
+ htab = elf_x86_hash_table (info, bed->target_id);
+ 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_x86_elf (ibfd, htab))
+ continue;
+
+ for (s = ibfd->sections; s != NULL; s = s->next)
+ {
+ struct elf_dyn_relocs *p;
+
+ 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 (htab->target_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 * htab->sizeof_reloc;
+ 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: %pB: warning: relocation "
+ "in read-only section `%pA'\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_x86_local_got_tls_type (ibfd);
+ local_tlsdesc_gotent = elf_x86_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_x86_compute_jump_table_size (htab);
+ htab->elf.sgotplt->size += 2 * htab->got_entry_size;
+ *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 += htab->got_entry_size;
+ if (GOT_TLS_GD_P (*local_tls_type)
+ || *local_tls_type == GOT_TLS_IE_BOTH)
+ s->size += htab->got_entry_size;
+ }
+ 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 * htab->sizeof_reloc;
+ else if (GOT_TLS_GD_P (*local_tls_type)
+ || ! GOT_TLS_GDESC_P (*local_tls_type))
+ srel->size += htab->sizeof_reloc;
+ if (GOT_TLS_GDESC_P (*local_tls_type))
+ {
+ htab->elf.srelplt->size += htab->sizeof_reloc;
+ if (bed->target_id == X86_64_ELF_DATA)
+ htab->tlsdesc_plt = (bfd_vma) -1;
+ }
+ }
+ }
+ else
+ *local_got = (bfd_vma) -1;
+ }
+ }
+
+ if (htab->tls_ld_or_ldm_got.refcount > 0)
+ {
+ /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
+ or R_X86_64_TLSLD relocs. */
+ htab->tls_ld_or_ldm_got.offset = htab->elf.sgot->size;
+ htab->elf.sgot->size += 2 * htab->got_entry_size;
+ htab->elf.srelgot->size += htab->sizeof_reloc;
+ }
+ else
+ htab->tls_ld_or_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_x86_allocate_dynrelocs,
+ info);
+
+ /* Allocate .plt and .got entries, and space for local symbols. */
+ htab_traverse (htab->loc_hash_table, elf_x86_allocate_local_dynreloc,
+ 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,X86_64}_IRELATIVE entries come last. */
+ if (htab->elf.srelplt)
+ {
+ htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
+ htab->sgotplt_jump_table_size
+ = elf_x86_compute_jump_table_size (htab);
+ 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->tlsdesc_plt)
+ {
+ /* NB: tlsdesc_plt is set only for x86-64. If we're not using
+ lazy TLS relocations, don't generate the PLT and GOT entries
+ they require. */
+ if ((info->flags & DF_BIND_NOW))
+ htab->tlsdesc_plt = 0;
+ else
+ {
+ htab->tlsdesc_got = htab->elf.sgot->size;
+ htab->elf.sgot->size += htab->got_entry_size;
+ /* Reserve room for the initial entry.
+ FIXME: we could probably do away with it in this case. */
+ if (htab->elf.splt->size == 0)
+ htab->elf.splt->size = htab->plt.plt_entry_size;
+ htab->tlsdesc_plt = htab->elf.splt->size;
+ htab->elf.splt->size += htab->plt.plt_entry_size;
+ }
+ }
+
+ 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->got_referenced)
+ && (htab->elf.sgotplt->size == bed->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;
+ /* Solaris requires to keep _GLOBAL_OFFSET_TABLE_ even if it
+ isn't used. */
+ if (htab->elf.hgot != NULL && htab->target_os != is_solaris)
+ {
+ /* Remove the unused _GLOBAL_OFFSET_TABLE_ from symbol
+ table. */
+ htab->elf.hgot->root.type = bfd_link_hash_undefined;
+ htab->elf.hgot->root.u.undef.abfd
+ = htab->elf.hgot->root.u.def.section->owner;
+ htab->elf.hgot->root.linker_def = 0;
+ htab->elf.hgot->ref_regular = 0;
+ htab->elf.hgot->def_regular = 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;
+
+ /* Unwind info for the second PLT and .plt.got sections are
+ identical. */
+ if (htab->plt_second_eh_frame != NULL
+ && htab->plt_second != NULL
+ && htab->plt_second->size != 0
+ && !bfd_is_abs_section (htab->plt_second->output_section))
+ htab->plt_second_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_second
+ || s == htab->plt_got
+ || s == htab->plt_eh_frame
+ || s == htab->plt_got_eh_frame
+ || s == htab->plt_second_eh_frame
+ || s == htab->elf.sdynbss
+ || s == htab->elf.sdynrelro)
+ {
+ /* Strip these too. */
+ }
+ else if (htab->is_reloc_section (bfd_section_name (s)))
+ {
+ 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. */
+ if (s != htab->elf.srelplt)
+ 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;
+
+ /* NB: Initially, the iplt section has minimal alignment to
+ avoid moving dot of the following section backwards when
+ it is empty. Update its section alignment now since it
+ is non-empty. */
+ if (s == htab->elf.iplt)
+ bfd_set_section_alignment (s, htab->plt.iplt_alignment);
+
+ /* Allocate memory for the section contents. We use bfd_zalloc
+ here in case unused entries are not reclaimed before the
+ section's contents are written out. This should not happen,
+ but this way if it does, we get a R_386_NONE or R_X86_64_NONE
+ reloc instead of garbage. */
+ s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
+ if (s->contents == NULL)
+ return FALSE;
+ }
+
+ if (htab->plt_eh_frame != NULL
+ && htab->plt_eh_frame->contents != NULL)
+ {
+ memcpy (htab->plt_eh_frame->contents,
+ htab->plt.eh_frame_plt,
+ htab->plt_eh_frame->size);
+ bfd_put_32 (dynobj, htab->elf.splt->size,
+ htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
+ }
+
+ if (htab->plt_got_eh_frame != NULL
+ && htab->plt_got_eh_frame->contents != NULL)
+ {
+ memcpy (htab->plt_got_eh_frame->contents,
+ htab->non_lazy_plt->eh_frame_plt,
+ htab->plt_got_eh_frame->size);
+ bfd_put_32 (dynobj, htab->plt_got->size,
+ (htab->plt_got_eh_frame->contents
+ + PLT_FDE_LEN_OFFSET));
+ }
+
+ if (htab->plt_second_eh_frame != NULL
+ && htab->plt_second_eh_frame->contents != NULL)
+ {
+ memcpy (htab->plt_second_eh_frame->contents,
+ htab->non_lazy_plt->eh_frame_plt,
+ htab->plt_second_eh_frame->size);
+ bfd_put_32 (dynobj, htab->plt_second->size,
+ (htab->plt_second_eh_frame->contents
+ + PLT_FDE_LEN_OFFSET));
+ }
+
+ if (htab->elf.dynamic_sections_created)
+ {
+ /* Add some entries to the .dynamic section. We fill in the
+ values later, in elf_{i386,x86_64}_finish_dynamic_sections,
+ but we must add the entries now so that we get the correct
+ size for the .dynamic section. The DT_DEBUG entry is filled
+ in by the dynamic linker and used by the debugger. */
+#define add_dynamic_entry(TAG, VAL) \
+ _bfd_elf_add_dynamic_entry (info, TAG, VAL)
+
+ if (bfd_link_executable (info))
+ {
+ if (!add_dynamic_entry (DT_DEBUG, 0))
+ return FALSE;
+ }
+
+ if (htab->elf.splt->size != 0)
+ {
+ /* DT_PLTGOT is used by prelink even if there is no PLT
+ relocation. */
+ if (!add_dynamic_entry (DT_PLTGOT, 0))
+ return FALSE;
+ }
+
+ if (htab->elf.srelplt->size != 0)
+ {
+ if (!add_dynamic_entry (DT_PLTRELSZ, 0)
+ || !add_dynamic_entry (DT_PLTREL, htab->dt_reloc)
+ || !add_dynamic_entry (DT_JMPREL, 0))
+ return FALSE;
+ }
+
+ if (htab->tlsdesc_plt
+ && (!add_dynamic_entry (DT_TLSDESC_PLT, 0)
+ || !add_dynamic_entry (DT_TLSDESC_GOT, 0)))
+ return FALSE;
+
+ if (relocs)
+ {
+ if (!add_dynamic_entry (htab->dt_reloc, 0)
+ || !add_dynamic_entry (htab->dt_reloc_sz, 0)
+ || !add_dynamic_entry (htab->dt_reloc_ent,
+ htab->sizeof_reloc))
+ return FALSE;
+
+ /* If any dynamic relocs apply to a read-only section,
+ then we need a DT_TEXTREL entry. */
+ if ((info->flags & DF_TEXTREL) == 0)
+ elf_link_hash_traverse (&htab->elf, maybe_set_textrel, info);
+
+ if ((info->flags & DF_TEXTREL) != 0)
+ {
+ if (htab->readonly_dynrelocs_against_ifunc)
+ {
+ info->callbacks->einfo
+ (_("%P%X: read-only segment has dynamic IFUNC relocations;"
+ " recompile with %s\n"),
+ bfd_link_dll (info) ? "-fPIC" : "-fPIE");
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+
+ if (!add_dynamic_entry (DT_TEXTREL, 0))
+ return FALSE;
+ }
+ }
+ if (htab->target_os == is_vxworks
+ && !elf_vxworks_add_dynamic_entries (output_bfd, info))
+ return FALSE;
+ }
+#undef add_dynamic_entry
+
+ return TRUE;
+}
+
+/* Finish up the x86 dynamic sections. */
+
+struct elf_x86_link_hash_table *
+_bfd_x86_elf_finish_dynamic_sections (bfd *output_bfd,
+ struct bfd_link_info *info)
+{
+ struct elf_x86_link_hash_table *htab;
+ const struct elf_backend_data *bed;
+ bfd *dynobj;
+ asection *sdyn;
+ bfd_byte *dyncon, *dynconend;
+ bfd_size_type sizeof_dyn;
+
+ bed = get_elf_backend_data (output_bfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab == NULL)
+ return htab;
+
+ dynobj = htab->elf.dynobj;
+ sdyn = bfd_get_linker_section (dynobj, ".dynamic");
+
+ /* GOT is always created in setup_gnu_properties. But it may not be
+ needed. .got.plt section may be needed for static IFUNC. */
+ if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
+ {
+ bfd_vma dynamic_addr;
+
+ if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
+ {
+ _bfd_error_handler
+ (_("discarded output section: `%pA'"), htab->elf.sgotplt);
+ return NULL;
+ }
+
+ elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize
+ = htab->got_entry_size;
+
+ dynamic_addr = (sdyn == NULL
+ ? (bfd_vma) 0
+ : sdyn->output_section->vma + sdyn->output_offset);
+
+ /* Set the first entry in the global offset table to the address
+ of the dynamic section. Write GOT[1] and GOT[2], needed for
+ the dynamic linker. */
+ if (htab->got_entry_size == 8)
+ {
+ bfd_put_64 (output_bfd, dynamic_addr,
+ htab->elf.sgotplt->contents);
+ bfd_put_64 (output_bfd, (bfd_vma) 0,
+ htab->elf.sgotplt->contents + 8);
+ bfd_put_64 (output_bfd, (bfd_vma) 0,
+ htab->elf.sgotplt->contents + 8*2);
+ }
+ else
+ {
+ bfd_put_32 (output_bfd, dynamic_addr,
+ htab->elf.sgotplt->contents);
+ bfd_put_32 (output_bfd, 0,
+ htab->elf.sgotplt->contents + 4);
+ bfd_put_32 (output_bfd, 0,
+ htab->elf.sgotplt->contents + 4*2);
+ }
+ }
+
+ if (!htab->elf.dynamic_sections_created)
+ return htab;
+
+ if (sdyn == NULL || htab->elf.sgot == NULL)
+ abort ();
+
+ sizeof_dyn = bed->s->sizeof_dyn;
+ dyncon = sdyn->contents;
+ dynconend = sdyn->contents + sdyn->size;
+ for (; dyncon < dynconend; dyncon += sizeof_dyn)
+ {
+ Elf_Internal_Dyn dyn;
+ asection *s;
+
+ (*bed->s->swap_dyn_in) (dynobj, dyncon, &dyn);
+
+ switch (dyn.d_tag)
+ {
+ default:
+ if (htab->target_os == is_vxworks
+ && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
+ break;
+ continue;
+
+ case DT_PLTGOT:
+ s = htab->elf.sgotplt;
+ dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
+ break;
+
+ case DT_JMPREL:
+ dyn.d_un.d_ptr = htab->elf.srelplt->output_section->vma;
+ break;
+
+ case DT_PLTRELSZ:
+ s = htab->elf.srelplt->output_section;
+ dyn.d_un.d_val = s->size;
+ break;
+
+ case DT_TLSDESC_PLT:
+ s = htab->elf.splt;
+ dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
+ + htab->tlsdesc_plt;
+ break;
+
+ case DT_TLSDESC_GOT:
+ s = htab->elf.sgot;
+ dyn.d_un.d_ptr = s->output_section->vma + s->output_offset
+ + htab->tlsdesc_got;
+ break;
+ }
+
+ (*bed->s->swap_dyn_out) (output_bfd, &dyn, dyncon);
+ }
+
+ if (htab->plt_got != NULL && htab->plt_got->size > 0)
+ elf_section_data (htab->plt_got->output_section)
+ ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
+
+ if (htab->plt_second != NULL && htab->plt_second->size > 0)
+ elf_section_data (htab->plt_second->output_section)
+ ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
+
+ /* Adjust .eh_frame for .plt section. */
+ if (htab->plt_eh_frame != NULL
+ && htab->plt_eh_frame->contents != NULL)
+ {
+ if (htab->elf.splt != NULL
+ && htab->elf.splt->size != 0
+ && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
+ && htab->elf.splt->output_section != NULL
+ && htab->plt_eh_frame->output_section != NULL)
+ {
+ bfd_vma plt_start = htab->elf.splt->output_section->vma;
+ bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
+ + htab->plt_eh_frame->output_offset
+ + PLT_FDE_START_OFFSET;
+ bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
+ htab->plt_eh_frame->contents
+ + PLT_FDE_START_OFFSET);
+ }
+
+ if (htab->plt_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
+ {
+ if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
+ htab->plt_eh_frame,
+ htab->plt_eh_frame->contents))
+ return NULL;
+ }
+ }
+
+ /* Adjust .eh_frame for .plt.got section. */
+ if (htab->plt_got_eh_frame != NULL
+ && htab->plt_got_eh_frame->contents != NULL)
+ {
+ if (htab->plt_got != NULL
+ && htab->plt_got->size != 0
+ && (htab->plt_got->flags & SEC_EXCLUDE) == 0
+ && htab->plt_got->output_section != NULL
+ && htab->plt_got_eh_frame->output_section != NULL)
+ {
+ bfd_vma plt_start = htab->plt_got->output_section->vma;
+ bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
+ + htab->plt_got_eh_frame->output_offset
+ + PLT_FDE_START_OFFSET;
+ bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
+ htab->plt_got_eh_frame->contents
+ + PLT_FDE_START_OFFSET);
+ }
+ if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
+ {
+ if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
+ htab->plt_got_eh_frame,
+ htab->plt_got_eh_frame->contents))
+ return NULL;
+ }
+ }
+
+ /* Adjust .eh_frame for the second PLT section. */
+ if (htab->plt_second_eh_frame != NULL
+ && htab->plt_second_eh_frame->contents != NULL)
{
- /* Check for __tls_get_addr reference. */
- struct elf_x86_link_hash_table *htab;
- const struct elf_backend_data *bed = get_elf_backend_data (abfd);
- htab = elf_x86_hash_table (info, bed->target_id);
- if (htab)
+ if (htab->plt_second != NULL
+ && htab->plt_second->size != 0
+ && (htab->plt_second->flags & SEC_EXCLUDE) == 0
+ && htab->plt_second->output_section != NULL
+ && htab->plt_second_eh_frame->output_section != NULL)
{
- struct elf_link_hash_entry *h
- = elf_link_hash_lookup (elf_hash_table (info),
- htab->tls_get_addr,
- FALSE, FALSE, FALSE);
- if (h != NULL)
- ((struct elf_x86_link_hash_entry *) h)->tls_get_addr = 1;
+ bfd_vma plt_start = htab->plt_second->output_section->vma;
+ bfd_vma eh_frame_start
+ = (htab->plt_second_eh_frame->output_section->vma
+ + htab->plt_second_eh_frame->output_offset
+ + PLT_FDE_START_OFFSET);
+ bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
+ htab->plt_second_eh_frame->contents
+ + PLT_FDE_START_OFFSET);
+ }
+ if (htab->plt_second_eh_frame->sec_info_type
+ == SEC_INFO_TYPE_EH_FRAME)
+ {
+ if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
+ htab->plt_second_eh_frame,
+ htab->plt_second_eh_frame->contents))
+ return NULL;
}
}
- /* Invoke the regular ELF backend linker to do all the work. */
- return _bfd_elf_link_check_relocs (abfd, info);
+ if (htab->elf.sgot && htab->elf.sgot->size > 0)
+ elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize
+ = htab->got_entry_size;
+
+ return htab;
}
+
bfd_boolean
_bfd_x86_elf_always_size_sections (bfd *output_bfd,
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;
+ edir->zero_undefweak |= eind->zero_undefweak;
if (ELIMINATE_COPY_RELOCS
&& ind->root.type != bfd_link_hash_indirect
dir->pointer_equality_needed |= ind->pointer_equality_needed;
}
else
- {
- if (eind->func_pointer_refcount > 0)
- {
- edir->func_pointer_refcount += eind->func_pointer_refcount;
- eind->func_pointer_refcount = 0;
- }
-
- _bfd_elf_link_hash_copy_indirect (info, dir, ind);
- }
+ _bfd_elf_link_hash_copy_indirect (info, dir, ind);
}
/* Remove undefined weak symbol from the dynamic symbol table if it
_bfd_x86_elf_fixup_symbol (struct bfd_link_info *info,
struct elf_link_hash_entry *h)
{
- if (h->dynindx != -1)
+ if (h->dynindx != -1
+ && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, elf_x86_hash_entry (h)))
{
- const struct elf_backend_data *bed
- = get_elf_backend_data (info->output_bfd);
- if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
- bed->target_id,
- elf_x86_hash_entry (h)->has_got_reloc,
- elf_x86_hash_entry (h)))
+ h->dynindx = -1;
+ _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
+ h->dynstr_index);
+ }
+ return TRUE;
+}
+
+/* Change the STT_GNU_IFUNC symbol defined in position-dependent
+ executable into the normal function symbol and set its address
+ to its PLT entry, which should be resolved by R_*_IRELATIVE at
+ run-time. */
+
+void
+_bfd_x86_elf_link_fixup_ifunc_symbol (struct bfd_link_info *info,
+ struct elf_x86_link_hash_table *htab,
+ struct elf_link_hash_entry *h,
+ Elf_Internal_Sym *sym)
+{
+ if (bfd_link_pde (info)
+ && h->def_regular
+ && h->dynindx != -1
+ && h->plt.offset != (bfd_vma) -1
+ && h->type == STT_GNU_IFUNC
+ && h->pointer_equality_needed)
+ {
+ asection *plt_s;
+ bfd_vma plt_offset;
+ bfd *output_bfd = info->output_bfd;
+
+ if (htab->plt_second)
+ {
+ struct elf_x86_link_hash_entry *eh
+ = (struct elf_x86_link_hash_entry *) h;
+
+ plt_s = htab->plt_second;
+ plt_offset = eh->plt_second.offset;
+ }
+ else
{
- h->dynindx = -1;
- _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
- h->dynstr_index);
+ plt_s = htab->elf.splt;
+ plt_offset = h->plt.offset;
}
+
+ sym->st_size = 0;
+ sym->st_info = ELF_ST_INFO (ELF_ST_BIND (sym->st_info), STT_FUNC);
+ sym->st_shndx
+ = _bfd_elf_section_from_bfd_section (output_bfd,
+ plt_s->output_section);
+ sym->st_value = (plt_s->output_section->vma
+ + plt_s->output_offset + plt_offset);
}
- return TRUE;
}
/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
return _bfd_elf_hash_symbol (h);
}
+/* 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. */
+
+bfd_boolean
+_bfd_x86_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
+ struct elf_link_hash_entry *h)
+{
+ struct elf_x86_link_hash_table *htab;
+ asection *s, *srel;
+ struct elf_x86_link_hash_entry *eh;
+ struct elf_dyn_relocs *p;
+ const struct elf_backend_data *bed
+ = get_elf_backend_data (info->output_bfd);
+
+ /* 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_x86_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/R_X86_64_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;
+
+ eh = (struct elf_x86_link_hash_entry *) h;
+
+ /* 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->is_weakalias)
+ {
+ struct elf_link_hash_entry *def = weakdef (h);
+ BFD_ASSERT (def->root.type == bfd_link_hash_defined);
+ h->root.u.def.section = def->root.u.def.section;
+ h->root.u.def.value = def->root.u.def.value;
+ if (ELIMINATE_COPY_RELOCS
+ || info->nocopyreloc
+ || SYMBOL_NO_COPYRELOC (info, eh))
+ {
+ /* NB: needs_copy is always 0 for i386. */
+ h->non_got_ref = def->non_got_ref;
+ eh->needs_copy = def->needs_copy;
+ }
+ 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. NB: gotoff_ref is always 0 for x86-64. */
+ if (!h->non_got_ref && !eh->gotoff_ref)
+ return TRUE;
+
+ /* If -z nocopyreloc was given, we won't generate them either. */
+ if (info->nocopyreloc || SYMBOL_NO_COPYRELOC (info, eh))
+ {
+ h->non_got_ref = 0;
+ return TRUE;
+ }
+
+ htab = elf_x86_hash_table (info, bed->target_id);
+ 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
+ && (bed->target_id == X86_64_ELF_DATA
+ || (!eh->gotoff_ref
+ && htab->target_os != is_vxworks)))
+ {
+ /* If we don't find any dynamic relocs in read-only sections,
+ then we'll be keeping the dynamic relocs and avoiding the copy
+ reloc. */
+ if (!readonly_dynrelocs (h))
+ {
+ 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/R_X86_64_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 += htab->sizeof_reloc;
+ h->needs_copy = 1;
+ }
+
+ return _bfd_elf_adjust_dynamic_copy (info, h, s);
+}
+
+void
+_bfd_x86_elf_hide_symbol (struct bfd_link_info *info,
+ struct elf_link_hash_entry *h,
+ bfd_boolean force_local)
+{
+ if (h->root.type == bfd_link_hash_undefweak
+ && info->nointerp
+ && bfd_link_pie (info))
+ {
+ /* When there is no dynamic interpreter in PIE, make the undefined
+ weak symbol dynamic so that PC relative branch to the undefined
+ weak symbol will land to address 0. */
+ struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
+ if (h->plt.refcount > 0
+ || eh->plt_got.refcount > 0)
+ return;
+ }
+
+ _bfd_elf_link_hash_hide_symbol (info, h, force_local);
+}
+
+/* Return TRUE if a symbol is referenced locally. It is similar to
+ SYMBOL_REFERENCES_LOCAL, but it also checks version script. It
+ works in check_relocs. */
+
+bfd_boolean
+_bfd_x86_elf_link_symbol_references_local (struct bfd_link_info *info,
+ struct elf_link_hash_entry *h)
+{
+ struct elf_x86_link_hash_entry *eh = elf_x86_hash_entry (h);
+ struct elf_x86_link_hash_table *htab
+ = (struct elf_x86_link_hash_table *) info->hash;
+
+ if (eh->local_ref > 1)
+ return TRUE;
+
+ if (eh->local_ref == 1)
+ return FALSE;
+
+ /* Unversioned symbols defined in regular objects can be forced local
+ by linker version script. A weak undefined symbol is forced local
+ if
+ 1. It has non-default visibility. Or
+ 2. When building executable, there is no dynamic linker. Or
+ 3. or "-z nodynamic-undefined-weak" is used.
+ */
+ if (SYMBOL_REFERENCES_LOCAL (info, h)
+ || (h->root.type == bfd_link_hash_undefweak
+ && (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
+ || (bfd_link_executable (info)
+ && htab->interp == NULL)
+ || info->dynamic_undefined_weak == 0))
+ || ((h->def_regular || ELF_COMMON_DEF_P (h))
+ && info->version_info != NULL
+ && _bfd_elf_link_hide_sym_by_version (info, h)))
+ {
+ eh->local_ref = 2;
+ return TRUE;
+ }
+
+ eh->local_ref = 1;
+ return FALSE;
+}
+
+/* Return the section that should be marked against GC for a given
+ relocation. */
+
+asection *
+_bfd_x86_elf_gc_mark_hook (asection *sec,
+ struct bfd_link_info *info,
+ Elf_Internal_Rela *rel,
+ struct elf_link_hash_entry *h,
+ Elf_Internal_Sym *sym)
+{
+ /* Compiler should optimize this out. */
+ if (((unsigned int) R_X86_64_GNU_VTINHERIT
+ != (unsigned int) R_386_GNU_VTINHERIT)
+ || ((unsigned int) R_X86_64_GNU_VTENTRY
+ != (unsigned int) R_386_GNU_VTENTRY))
+ abort ();
+
+ if (h != NULL)
+ switch (ELF32_R_TYPE (rel->r_info))
+ {
+ case R_X86_64_GNU_VTINHERIT:
+ case R_X86_64_GNU_VTENTRY:
+ return NULL;
+ }
+
+ return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
+}
+
static bfd_vma
elf_i386_get_plt_got_vma (struct elf_x86_plt *plt_p ATTRIBUTE_UNUSED,
bfd_vma off,
bfd_vma);
bfd_boolean (*valid_plt_reloc_p) (unsigned int);
+ dynrelbuf = NULL;
if (count == 0)
- return -1;
+ goto bad_return;
dynrelbuf = (arelent **) bfd_malloc (relsize);
if (dynrelbuf == NULL)
- return -1;
+ goto bad_return;
dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
dynsyms);
+ if (dynrelcount <= 0)
+ goto bad_return;
/* Sort the relocs by address. */
qsort (dynrelbuf, dynrelcount, sizeof (arelent *),
names += sizeof ("@plt");
n++;
s++;
+ /* There should be only one entry in PLT for a given
+ symbol. Set howto to NULL after processing a PLT
+ entry to guard against corrupted PLT. */
+ p->howto = NULL;
}
offset += plt_entry_size;
}
{
elf_property *prop;
- switch (type)
+ if (type == GNU_PROPERTY_X86_COMPAT_ISA_1_USED
+ || type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
+ || (type >= GNU_PROPERTY_X86_UINT32_AND_LO
+ && type <= GNU_PROPERTY_X86_UINT32_AND_HI)
+ || (type >= GNU_PROPERTY_X86_UINT32_OR_LO
+ && type <= GNU_PROPERTY_X86_UINT32_OR_HI)
+ || (type >= GNU_PROPERTY_X86_UINT32_OR_AND_LO
+ && type <= GNU_PROPERTY_X86_UINT32_OR_AND_HI))
{
- case GNU_PROPERTY_X86_ISA_1_USED:
- case GNU_PROPERTY_X86_ISA_1_NEEDED:
- case GNU_PROPERTY_X86_FEATURE_1_AND:
if (datasz != 4)
{
_bfd_error_handler
- ((type == GNU_PROPERTY_X86_ISA_1_USED
- ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
- : (type == GNU_PROPERTY_X86_ISA_1_NEEDED
- ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
- : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
- abfd, datasz);
+ (_("error: %pB: <corrupt x86 property (0x%x) size: 0x%x>"),
+ abfd, type, datasz);
return property_corrupt;
}
prop = _bfd_elf_get_property (abfd, type, datasz);
- /* Combine properties of the same type. */
prop->u.number |= bfd_h_get_32 (abfd, ptr);
prop->pr_kind = property_number;
- break;
-
- default:
- return property_ignored;
+ return property_number;
}
- return property_number;
+ return property_ignored;
}
/* Merge x86 GNU property BPROP with APROP. If APROP isn't NULL,
bfd_boolean
_bfd_x86_elf_merge_gnu_properties (struct bfd_link_info *info,
bfd *abfd ATTRIBUTE_UNUSED,
+ bfd *bbfd ATTRIBUTE_UNUSED,
elf_property *aprop,
elf_property *bprop)
{
bfd_boolean updated = FALSE;
unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
- switch (pr_type)
+ if (pr_type == GNU_PROPERTY_X86_COMPAT_ISA_1_USED
+ || (pr_type >= GNU_PROPERTY_X86_UINT32_OR_AND_LO
+ && pr_type <= GNU_PROPERTY_X86_UINT32_OR_AND_HI))
{
- case GNU_PROPERTY_X86_ISA_1_USED:
- case GNU_PROPERTY_X86_ISA_1_NEEDED:
- if (aprop != NULL && bprop != NULL)
+ if (aprop == NULL || bprop == NULL)
+ {
+ /* Only one of APROP and BPROP can be NULL. */
+ if (aprop != NULL)
+ {
+ /* Remove this property since the other input file doesn't
+ have it. */
+ aprop->pr_kind = property_remove;
+ updated = TRUE;
+ }
+ }
+ else
{
number = aprop->u.number;
aprop->u.number = number | bprop->u.number;
updated = number != (unsigned int) aprop->u.number;
}
+ return updated;
+ }
+ else if (pr_type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
+ || (pr_type >= GNU_PROPERTY_X86_UINT32_OR_LO
+ && pr_type <= GNU_PROPERTY_X86_UINT32_OR_HI))
+ {
+ if (aprop != NULL && bprop != NULL)
+ {
+ number = aprop->u.number;
+ aprop->u.number = number | bprop->u.number;
+ /* Remove the property if all bits are empty. */
+ if (aprop->u.number == 0)
+ {
+ aprop->pr_kind = property_remove;
+ updated = TRUE;
+ }
+ else
+ updated = number != (unsigned int) aprop->u.number;
+ }
else
{
- /* Return TRUE if APROP is NULL to indicate that BPROP should
- be added to ABFD. */
- updated = aprop == NULL;
+ /* Only one of APROP and BPROP can be NULL. */
+ if (aprop != NULL)
+ {
+ if (aprop->u.number == 0)
+ {
+ /* Remove APROP if all bits are empty. */
+ aprop->pr_kind = property_remove;
+ updated = TRUE;
+ }
+ }
+ else
+ {
+ /* Return TRUE if APROP is NULL and all bits of BPROP
+ aren't empty to indicate that BPROP should be added
+ to ABFD. */
+ updated = bprop->u.number != 0;
+ }
}
- break;
-
- case GNU_PROPERTY_X86_FEATURE_1_AND:
+ return updated;
+ }
+ else if (pr_type >= GNU_PROPERTY_X86_UINT32_AND_LO
+ && pr_type <= GNU_PROPERTY_X86_UINT32_AND_HI)
+ {
/* Only one of APROP and BPROP can be NULL:
1. APROP & BPROP when both APROP and BPROP aren't NULL.
2. If APROP is NULL, remove x86 feature.
3. Otherwise, do nothing.
*/
+ const struct elf_backend_data *bed
+ = get_elf_backend_data (info->output_bfd);
+ struct elf_x86_link_hash_table *htab
+ = elf_x86_hash_table (info, bed->target_id);
+ if (!htab)
+ abort ();
if (aprop != NULL && bprop != NULL)
{
features = 0;
- if (info->ibt)
+ if (htab->params->ibt)
features = GNU_PROPERTY_X86_FEATURE_1_IBT;
- if (info->shstk)
+ if (htab->params->shstk)
features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
number = aprop->u.number;
/* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
}
else
{
+ /* There should be no AND properties since some input doesn't
+ have them. Set IBT and SHSTK properties for -z ibt and -z
+ shstk if needed. */
features = 0;
- if (info->ibt)
+ if (htab->params->ibt)
features = GNU_PROPERTY_X86_FEATURE_1_IBT;
- if (info->shstk)
+ if (htab->params->shstk)
features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
if (features)
{
- /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
- GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
if (aprop != NULL)
{
- number = aprop->u.number;
- aprop->u.number = number | features;
- updated = number != (unsigned int) aprop->u.number;
+ updated = features != (unsigned int) aprop->u.number;
+ aprop->u.number = features;
}
else
{
- bprop->u.number |= features;
updated = TRUE;
+ bprop->u.number = features;
}
}
else if (aprop != NULL)
updated = TRUE;
}
}
- break;
-
- default:
+ return updated;
+ }
+ else
+ {
/* Never should happen. */
abort ();
}
bfd *
_bfd_x86_elf_link_setup_gnu_properties
- (struct bfd_link_info *info,
- struct elf_x86_plt_layout_table *plt_layout)
+ (struct bfd_link_info *info, struct elf_x86_init_table *init_table)
{
bfd_boolean normal_target;
bfd_boolean lazy_plt;
unsigned int class_align = ABI_64_P (info->output_bfd) ? 3 : 2;
unsigned int got_align;
- features = 0;
- if (info->ibt)
- features = GNU_PROPERTY_X86_FEATURE_1_IBT;
- if (info->shstk)
- features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
-
/* Find a normal input file with GNU property note. */
for (pbfd = info->input_bfds;
pbfd != NULL;
break;
}
- if (ebfd != NULL && features)
+ bed = get_elf_backend_data (info->output_bfd);
+
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab == NULL)
+ return pbfd;
+
+ features = 0;
+ if (htab->params->ibt)
{
- /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
- GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
- prop = _bfd_elf_get_property (ebfd,
- GNU_PROPERTY_X86_FEATURE_1_AND,
- 4);
- prop->u.number |= features;
- prop->pr_kind = property_number;
+ features = GNU_PROPERTY_X86_FEATURE_1_IBT;
+ htab->params->cet_report &= ~cet_report_ibt;
+ }
+ if (htab->params->shstk)
+ {
+ features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
+ htab->params->cet_report &= ~cet_report_shstk;
+ }
+ if (!(htab->params->cet_report & (cet_report_ibt | cet_report_shstk)))
+ htab->params->cet_report = cet_report_none;
+
+ if (ebfd != NULL)
+ {
+ prop = NULL;
+ if (features)
+ {
+ /* If features is set, add GNU_PROPERTY_X86_FEATURE_1_IBT and
+ GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
+ prop = _bfd_elf_get_property (ebfd,
+ GNU_PROPERTY_X86_FEATURE_1_AND,
+ 4);
+ prop->u.number |= features;
+ prop->pr_kind = property_number;
+ }
/* Create the GNU property note section if needed. */
- if (pbfd == NULL)
+ if (prop != NULL && pbfd == NULL)
{
sec = bfd_make_section_with_flags (ebfd,
NOTE_GNU_PROPERTY_SECTION_NAME,
| SEC_HAS_CONTENTS
| SEC_DATA));
if (sec == NULL)
- info->callbacks->einfo (_("%F: failed to create GNU property section\n"));
+ info->callbacks->einfo (_("%F%P: failed to create GNU property section\n"));
- if (!bfd_set_section_alignment (ebfd, sec, class_align))
+ if (!bfd_set_section_alignment (sec, class_align))
{
error_alignment:
- info->callbacks->einfo (_("%F%A: failed to align section\n"),
+ info->callbacks->einfo (_("%F%pA: failed to align section\n"),
sec);
}
}
}
+ if (htab->params->cet_report)
+ {
+ /* Report missing IBT and SHSTK properties. */
+ bfd *abfd;
+ const char *msg;
+ elf_property_list *p;
+ bfd_boolean missing_ibt, missing_shstk;
+ bfd_boolean check_ibt
+ = !!(htab->params->cet_report & cet_report_ibt);
+ bfd_boolean check_shstk
+ = !!(htab->params->cet_report & cet_report_shstk);
+
+ if ((htab->params->cet_report & cet_report_warning))
+ msg = _("%P: %pB: warning: missing %s\n");
+ else
+ msg = _("%X%P: %pB: error: missing %s\n");
+
+ for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
+ if (!(abfd->flags & (DYNAMIC | BFD_PLUGIN | BFD_LINKER_CREATED))
+ && bfd_get_flavour (abfd) == bfd_target_elf_flavour)
+ {
+ for (p = elf_properties (abfd); p; p = p->next)
+ if (p->property.pr_type == GNU_PROPERTY_X86_FEATURE_1_AND)
+ break;
+
+ missing_ibt = check_ibt;
+ missing_shstk = check_shstk;
+ if (p)
+ {
+ missing_ibt &= !(p->property.u.number
+ & GNU_PROPERTY_X86_FEATURE_1_IBT);
+ missing_shstk &= !(p->property.u.number
+ & GNU_PROPERTY_X86_FEATURE_1_SHSTK);
+ }
+ if (missing_ibt || missing_shstk)
+ {
+ const char *missing;
+ if (missing_ibt && missing_shstk)
+ missing = _("IBT and SHSTK properties");
+ else if (missing_ibt)
+ missing = _("IBT property");
+ else
+ missing = _("SHSTK property");
+ info->callbacks->einfo (msg, abfd, missing);
+ }
+ }
+ }
+
pbfd = _bfd_elf_link_setup_gnu_properties (info);
+ htab->r_info = init_table->r_info;
+ htab->r_sym = init_table->r_sym;
+
if (bfd_link_relocatable (info))
return pbfd;
- bed = get_elf_backend_data (info->output_bfd);
-
- htab = elf_x86_hash_table (info, bed->target_id);
- if (htab == NULL)
- return pbfd;
+ htab->plt0_pad_byte = init_table->plt0_pad_byte;
- use_ibt_plt = info->ibtplt || info->ibt;
+ use_ibt_plt = htab->params->ibtplt || htab->params->ibt;
if (!use_ibt_plt && pbfd != NULL)
{
/* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
abfd = abfd->link.next)
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
&& (abfd->flags
- & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
+ & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0
+ && bed->relocs_compatible (abfd->xvec,
+ info->output_bfd->xvec))
{
htab->elf.dynobj = abfd;
dynobj = abfd;
}
}
+ /* Return if there are no normal input files. */
+ if (dynobj == NULL)
+ return pbfd;
+
/* Even when lazy binding is disabled by "-z now", the PLT0 entry may
still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
canonical function address. */
htab->plt.has_plt0 = 1;
- normal_target = plt_layout->normal_target;
+ normal_target = htab->target_os == is_normal;
if (normal_target)
{
if (use_ibt_plt)
{
- htab->lazy_plt = plt_layout->lazy_ibt_plt;
- htab->non_lazy_plt = plt_layout->non_lazy_ibt_plt;
+ htab->lazy_plt = init_table->lazy_ibt_plt;
+ htab->non_lazy_plt = init_table->non_lazy_ibt_plt;
}
else
{
- htab->lazy_plt = plt_layout->lazy_plt;
- htab->non_lazy_plt = plt_layout->non_lazy_plt;
+ htab->lazy_plt = init_table->lazy_plt;
+ htab->non_lazy_plt = init_table->non_lazy_plt;
}
}
else
{
- htab->lazy_plt = plt_layout->lazy_plt;
+ htab->lazy_plt = init_table->lazy_plt;
htab->non_lazy_plt = NULL;
}
htab->plt.eh_frame_plt = htab->lazy_plt->eh_frame_plt;
}
- /* Return if there are no normal input files. */
- if (dynobj == NULL)
- return pbfd;
-
- if (plt_layout->is_vxworks
+ if (htab->target_os == is_vxworks
&& !elf_vxworks_create_dynamic_sections (dynobj, info,
&htab->srelplt2))
{
- info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
+ info->callbacks->einfo (_("%F%P: failed to create VxWorks dynamic sections\n"));
return pbfd;
}
don't need to do it in check_relocs. */
if (htab->elf.sgot == NULL
&& !_bfd_elf_create_got_section (dynobj, info))
- info->callbacks->einfo (_("%F: failed to create GOT sections\n"));
+ info->callbacks->einfo (_("%F%P: failed to create GOT sections\n"));
got_align = (bed->target_id == X86_64_ELF_DATA) ? 3 : 2;
instead of in create_dynamic_sections so that they are always
properly aligned even if create_dynamic_sections isn't called. */
sec = htab->elf.sgot;
- if (!bfd_set_section_alignment (dynobj, sec, got_align))
+ if (!bfd_set_section_alignment (sec, got_align))
goto error_alignment;
sec = htab->elf.sgotplt;
- if (!bfd_set_section_alignment (dynobj, sec, got_align))
+ if (!bfd_set_section_alignment (sec, got_align))
goto error_alignment;
/* Create the ifunc sections here so that check_relocs can be
simplified. */
if (!_bfd_elf_create_ifunc_sections (dynobj, info))
- info->callbacks->einfo (_("%F: failed to create ifunc sections\n"));
+ info->callbacks->einfo (_("%F%P: failed to create ifunc sections\n"));
plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
= bfd_log2 (htab->non_lazy_plt->plt_entry_size);
sec = pltsec;
- if (!bfd_set_section_alignment (sec->owner, sec,
- plt_alignment))
+ if (!bfd_set_section_alignment (sec, plt_alignment))
goto error_alignment;
/* Create the GOT procedure linkage table. */
".plt.got",
pltflags);
if (sec == NULL)
- info->callbacks->einfo (_("%F: failed to create GOT PLT section\n"));
+ info->callbacks->einfo (_("%F%P: failed to create GOT PLT section\n"));
- if (!bfd_set_section_alignment (dynobj, sec,
- non_lazy_plt_alignment))
+ if (!bfd_set_section_alignment (sec, non_lazy_plt_alignment))
goto error_alignment;
htab->plt_got = sec;
".plt.sec",
pltflags);
if (sec == NULL)
- info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
+ info->callbacks->einfo (_("%F%P: failed to create IBT-enabled PLT section\n"));
- if (!bfd_set_section_alignment (dynobj, sec,
- plt_alignment))
+ if (!bfd_set_section_alignment (sec, plt_alignment))
goto error_alignment;
}
- else if (info->bndplt && ABI_64_P (dynobj))
+ else if (htab->params->bndplt && ABI_64_P (dynobj))
{
/* Create the second PLT for Intel MPX support. MPX
PLT is supported only for non-NaCl target in 64-bit
".plt.sec",
pltflags);
if (sec == NULL)
- info->callbacks->einfo (_("%F: failed to create BND PLT section\n"));
+ info->callbacks->einfo (_("%F%P: failed to create BND PLT section\n"));
- if (!bfd_set_section_alignment (dynobj, sec,
- non_lazy_plt_alignment))
+ if (!bfd_set_section_alignment (sec, non_lazy_plt_alignment))
goto error_alignment;
}
".eh_frame",
flags);
if (sec == NULL)
- info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n"));
+ info->callbacks->einfo (_("%F%P: failed to create PLT .eh_frame section\n"));
- if (!bfd_set_section_alignment (dynobj, sec, class_align))
+ if (!bfd_set_section_alignment (sec, class_align))
goto error_alignment;
htab->plt_eh_frame = sec;
".eh_frame",
flags);
if (sec == NULL)
- info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
+ info->callbacks->einfo (_("%F%P: failed to create GOT PLT .eh_frame section\n"));
- if (!bfd_set_section_alignment (dynobj, sec, class_align))
+ if (!bfd_set_section_alignment (sec, class_align))
goto error_alignment;
htab->plt_got_eh_frame = sec;
".eh_frame",
flags);
if (sec == NULL)
- info->callbacks->einfo (_("%F: failed to create the second PLT .eh_frame section\n"));
+ info->callbacks->einfo (_("%F%P: failed to create the second PLT .eh_frame section\n"));
- if (!bfd_set_section_alignment (dynobj, sec, class_align))
+ if (!bfd_set_section_alignment (sec, class_align))
goto error_alignment;
htab->plt_second_eh_frame = sec;
}
}
- if (normal_target)
+ /* The .iplt section is used for IFUNC symbols in static
+ executables. */
+ sec = htab->elf.iplt;
+ if (sec != NULL)
{
- /* The .iplt section is used for IFUNC symbols in static
- executables. */
- sec = htab->elf.iplt;
- if (sec != NULL
- && !bfd_set_section_alignment (sec->owner, sec,
- plt_alignment))
+ /* NB: Delay setting its alignment until we know it is non-empty.
+ Otherwise an empty iplt section may change vma and lma of the
+ following sections, which triggers moving dot of the following
+ section backwards, resulting in a warning and section lma not
+ being set properly. It later leads to a "File truncated"
+ error. */
+ if (!bfd_set_section_alignment (sec, 0))
goto error_alignment;
+
+ htab->plt.iplt_alignment = (normal_target
+ ? plt_alignment
+ : bed->plt_alignment);
}
return pbfd;
}
+
+/* Fix up x86 GNU properties. */
+
+void
+_bfd_x86_elf_link_fixup_gnu_properties
+ (struct bfd_link_info *info ATTRIBUTE_UNUSED,
+ elf_property_list **listp)
+{
+ elf_property_list *p;
+
+ for (p = *listp; p; p = p->next)
+ {
+ unsigned int type = p->property.pr_type;
+ if (type == GNU_PROPERTY_X86_COMPAT_ISA_1_USED
+ || type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
+ || (type >= GNU_PROPERTY_X86_UINT32_AND_LO
+ && type <= GNU_PROPERTY_X86_UINT32_AND_HI)
+ || (type >= GNU_PROPERTY_X86_UINT32_OR_LO
+ && type <= GNU_PROPERTY_X86_UINT32_OR_HI)
+ || (type >= GNU_PROPERTY_X86_UINT32_OR_AND_LO
+ && type <= GNU_PROPERTY_X86_UINT32_OR_AND_HI))
+ {
+ if (p->property.u.number == 0
+ && (type == GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED
+ || (type >= GNU_PROPERTY_X86_UINT32_AND_LO
+ && type <= GNU_PROPERTY_X86_UINT32_AND_HI)
+ || (type >= GNU_PROPERTY_X86_UINT32_OR_LO
+ && type <= GNU_PROPERTY_X86_UINT32_OR_HI)))
+ {
+ /* Remove empty property. */
+ *listp = p->next;
+ continue;
+ }
+
+ listp = &p->next;
+ }
+ else if (type > GNU_PROPERTY_HIPROC)
+ {
+ /* The property list is sorted in order of type. */
+ break;
+ }
+ }
+}
+
+void
+_bfd_elf_linker_x86_set_options (struct bfd_link_info * info,
+ struct elf_linker_x86_params *params)
+{
+ const struct elf_backend_data *bed
+ = get_elf_backend_data (info->output_bfd);
+ struct elf_x86_link_hash_table *htab
+ = elf_x86_hash_table (info, bed->target_id);
+ if (htab != NULL)
+ htab->params = params;
+}
projects / deliverable / binutils-gdb.git / blobdiff