/* x86 specific support for ELF
- Copyright (C) 2017-2021 Free Software Foundation, Inc.
+ Copyright (C) 2017-2023 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
#include "elfxx-x86.h"
#include "elf-vxworks.h"
#include "objalloc.h"
-#include "elf/i386.h"
-#include "elf/x86-64.h"
/* The name of the dynamic interpreter. This is put in the .interp
section. */
{
asection *sreloc;
+ if (eh->def_protected && bfd_link_executable (info))
+ {
+ /* Disallow copy relocation against non-copyable protected
+ symbol. */
+ asection *s = p->sec->output_section;
+ if (s != NULL && (s->flags & SEC_READONLY) != 0)
+ {
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: copy relocation against non-copyable "
+ "protected symbol `%s' in %pB\n"),
+ p->sec->owner, h->root.root.string,
+ h->root.u.def.section->owner);
+ return false;
+ }
+ }
+
sreloc = elf_section_data (p->sec)->sreloc;
BFD_ASSERT (sreloc != NULL);
ret->got_entry_size = 8;
ret->pcrel_plt = true;
ret->tls_get_addr = "__tls_get_addr";
+ ret->relative_r_type = R_X86_64_RELATIVE;
+ ret->relative_r_name = "R_X86_64_RELATIVE";
+ ret->elf_append_reloc = elf_append_rela;
+ ret->elf_write_addend_in_got = _bfd_elf64_write_addend;
}
if (ABI_64_P (abfd))
{
ret->pointer_r_type = R_X86_64_64;
ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
+ ret->elf_write_addend = _bfd_elf64_write_addend;
}
else
{
ret->dynamic_interpreter = ELFX32_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size
= sizeof ELFX32_DYNAMIC_INTERPRETER;
+ ret->elf_write_addend = _bfd_elf32_write_addend;
}
else
{
ret->got_entry_size = 4;
ret->pcrel_plt = false;
ret->pointer_r_type = R_386_32;
+ ret->relative_r_type = R_386_RELATIVE;
+ ret->relative_r_name = "R_386_RELATIVE";
+ ret->elf_append_reloc = elf_append_rel;
+ ret->elf_write_addend = _bfd_elf32_write_addend;
+ ret->elf_write_addend_in_got = _bfd_elf32_write_addend;
ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size
= sizeof ELF32_DYNAMIC_INTERPRETER;
return 0;
}
-/* Mark symbol, NAME, as locally defined by linker if it is referenced
- and not defined in a relocatable object file. */
+/* 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);
+}
+
+bool
+_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);
+}
+
+/* Look through the relocs for a section before allocation to make the
+ dynamic reloc section. */
+
+bool
+_bfd_x86_elf_check_relocs (bfd *abfd,
+ struct bfd_link_info *info,
+ asection *sec,
+ const Elf_Internal_Rela *relocs)
+{
+ struct elf_x86_link_hash_table *htab;
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes;
+ const Elf_Internal_Rela *rel;
+ const Elf_Internal_Rela *rel_end;
+ asection *sreloc;
+ const struct elf_backend_data *bed;
+ bool is_x86_64;
+
+ if (bfd_link_relocatable (info))
+ return true;
+
+ bed = get_elf_backend_data (abfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab == NULL)
+ {
+ sec->check_relocs_failed = 1;
+ return false;
+ }
+
+ is_x86_64 = bed->target_id == X86_64_ELF_DATA;
+
+ symtab_hdr = &elf_symtab_hdr (abfd);
+ sym_hashes = elf_sym_hashes (abfd);
+
+ rel_end = relocs + sec->reloc_count;
+ for (rel = relocs; rel < rel_end; rel++)
+ {
+ unsigned int r_type;
+ unsigned int r_symndx;
+ struct elf_link_hash_entry *h;
+
+ r_symndx = htab->r_sym (rel->r_info);
+ r_type = ELF32_R_TYPE (rel->r_info);
+
+ if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
+ {
+ /* xgettext:c-format */
+ _bfd_error_handler (_("%pB: bad symbol index: %d"),
+ abfd, r_symndx);
+ goto error_return;
+ }
+
+ if (r_symndx < symtab_hdr->sh_info)
+ h = NULL;
+ else
+ {
+ h = sym_hashes[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;
+ }
+
+ if (X86_NEED_DYNAMIC_RELOC_TYPE_P (is_x86_64, r_type)
+ && NEED_DYNAMIC_RELOCATION_P (is_x86_64, info, true, h, sec,
+ r_type, htab->pointer_r_type))
+ {
+ /* We may copy these reloc types into the output file.
+ Create a reloc section in dynobj and make room for
+ this reloc. */
+ sreloc = _bfd_elf_make_dynamic_reloc_section
+ (sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
+ abfd, sec->use_rela_p);
+
+ if (sreloc != NULL)
+ return true;
+
+ error_return:
+ sec->check_relocs_failed = 1;
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/* Add an entry to the relative reloc record. */
+
+static bool
+elf_x86_relative_reloc_record_add
+ (struct bfd_link_info *info,
+ struct elf_x86_relative_reloc_data *relative_reloc,
+ Elf_Internal_Rela *rel, asection *sec,
+ asection *sym_sec, struct elf_link_hash_entry *h,
+ Elf_Internal_Sym *sym, bfd_vma offset)
+{
+ bfd_size_type newidx;
+
+ if (relative_reloc->data == NULL)
+ {
+ relative_reloc->data = bfd_malloc
+ (sizeof (struct elf_x86_relative_reloc_record));
+ relative_reloc->count = 0;
+ relative_reloc->size = 1;
+ }
+
+ newidx = relative_reloc->count++;
+
+ if (relative_reloc->count > relative_reloc->size)
+ {
+ relative_reloc->size <<= 1;
+ relative_reloc->data = bfd_realloc
+ (relative_reloc->data,
+ (relative_reloc->size
+ * sizeof (struct elf_x86_relative_reloc_record)));
+ }
+
+ if (relative_reloc->data == NULL)
+ {
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: failed to allocate relative reloc record\n"),
+ info->output_bfd);
+ return false;
+ }
+
+ relative_reloc->data[newidx].rel = *rel;
+ relative_reloc->data[newidx].sec = sec;
+ if (h != NULL)
+ {
+ /* Set SYM to NULL to indicate a global symbol. */
+ relative_reloc->data[newidx].sym = NULL;
+ relative_reloc->data[newidx].u.h = h;
+ }
+ else
+ {
+ relative_reloc->data[newidx].sym = sym;
+ relative_reloc->data[newidx].u.sym_sec = sym_sec;
+ }
+ relative_reloc->data[newidx].offset = offset;
+ relative_reloc->data[newidx].address = 0;
+ return true;
+}
+
+/* After input sections have been mapped to output sections and
+ addresses of output sections are set initiallly, scan input
+ relocations with the same logic in relocate_section to determine
+ if a relative relocation should be generated. Save the relative
+ relocation candidate information for sizing the DT_RELR section
+ later after all symbols addresses can be determined. */
+
+bool
+_bfd_x86_elf_link_relax_section (bfd *abfd ATTRIBUTE_UNUSED,
+ asection *input_section,
+ struct bfd_link_info *info,
+ bool *again)
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Rela *internal_relocs;
+ Elf_Internal_Rela *irel, *irelend;
+ Elf_Internal_Sym *isymbuf = NULL;
+ struct elf_link_hash_entry **sym_hashes;
+ const struct elf_backend_data *bed;
+ struct elf_x86_link_hash_table *htab;
+ bfd_vma *local_got_offsets;
+ bool is_x86_64;
+ bool unaligned_section;
+
+ if (bfd_link_relocatable (info))
+ return true;
+
+ /* Assume we're not going to change any sizes, and we'll only need
+ one pass. */
+ *again = false;
+
+ bed = get_elf_backend_data (abfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab == NULL)
+ return true;
+
+ /* Nothing to do if there are no relocations or relative relocations
+ have been packed. */
+ if (input_section == htab->elf.srelrdyn
+ || input_section->relative_reloc_packed
+ || ((input_section->flags & (SEC_RELOC | SEC_ALLOC))
+ != (SEC_RELOC | SEC_ALLOC))
+ || (input_section->flags & SEC_DEBUGGING) != 0
+ || input_section->reloc_count == 0)
+ return true;
+
+ /* Skip if the section isn't aligned. */
+ unaligned_section = input_section->alignment_power == 0;
+
+ is_x86_64 = bed->target_id == X86_64_ELF_DATA;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ local_got_offsets = elf_local_got_offsets (abfd);
+
+ /* Load the relocations for this section. */
+ internal_relocs =
+ _bfd_elf_link_read_relocs (abfd, input_section, NULL,
+ (Elf_Internal_Rela *) NULL,
+ info->keep_memory);
+ if (internal_relocs == NULL)
+ return false;
+
+ irelend = internal_relocs + input_section->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++)
+ {
+ unsigned int r_type;
+ unsigned int r_symndx;
+ Elf_Internal_Sym *isym;
+ struct elf_link_hash_entry *h;
+ struct elf_x86_link_hash_entry *eh;
+ bfd_vma offset;
+ bool resolved_to_zero;
+ bool need_copy_reloc_in_pie;
+ bool pc32_reloc;
+ asection *sec;
+ /* Offset must be a multiple of 2. */
+ bool unaligned_offset = (irel->r_offset & 1) != 0;
+ /* True if there is a relative relocation against a dynamic
+ symbol. */
+ bool dynamic_relative_reloc_p;
+
+ /* Get the value of the symbol referred to by the reloc. */
+ r_symndx = htab->r_sym (irel->r_info);
+
+ r_type = ELF32_R_TYPE (irel->r_info);
+ /* Clear the R_X86_64_converted_reloc_bit bit. */
+ r_type &= ~R_X86_64_converted_reloc_bit;
+
+ sec = NULL;
+ h = NULL;
+ dynamic_relative_reloc_p = false;
+
+ if (r_symndx < symtab_hdr->sh_info)
+ {
+ /* Read this BFD's local symbols. */
+ if (isymbuf == NULL)
+ {
+ isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
+ if (isymbuf == NULL)
+ isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
+ symtab_hdr->sh_info, 0,
+ NULL, NULL, NULL);
+ if (isymbuf == NULL)
+ goto error_return;
+ }
+
+ isym = isymbuf + r_symndx;
+ switch (isym->st_shndx)
+ {
+ case SHN_ABS:
+ sec = bfd_abs_section_ptr;
+ break;
+ case SHN_COMMON:
+ sec = bfd_com_section_ptr;
+ break;
+ case SHN_X86_64_LCOMMON:
+ if (!is_x86_64)
+ abort ();
+ sec = &_bfd_elf_large_com_section;
+ break;
+ default:
+ sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
+ break;
+ }
+
+ /* Skip relocation against local STT_GNU_IFUNC symbol. */
+ if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
+ continue;
+
+ eh = (struct elf_x86_link_hash_entry *) h;
+ resolved_to_zero = false;
+ }
+ else
+ {
+ /* Get H and SEC for GENERATE_DYNAMIC_RELOCATION_P below. */
+ h = sym_hashes[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;
+
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ sec = h->root.u.def.section;
+
+ /* Skip relocation against STT_GNU_IFUNC symbol. */
+ if (h->type == STT_GNU_IFUNC)
+ continue;
+
+ eh = (struct elf_x86_link_hash_entry *) h;
+ resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
+
+ /* NB: See how elf_backend_finish_dynamic_symbol is called
+ from elf_link_output_extsym. */
+ if ((h->dynindx != -1 || h->forced_local)
+ && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
+ || h->root.type != bfd_link_hash_undefweak)
+ || !h->forced_local)
+ && h->got.offset != (bfd_vma) -1
+ && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h)->tls_type)
+ && elf_x86_hash_entry (h)->tls_type != GOT_TLS_IE
+ && !resolved_to_zero
+ && SYMBOL_REFERENCES_LOCAL_P (info, h)
+ && SYMBOL_DEFINED_NON_SHARED_P (h))
+ dynamic_relative_reloc_p = true;
+
+ isym = NULL;
+ }
+
+ if (X86_GOT_TYPE_P (is_x86_64, r_type))
+ {
+ /* Pack GOT relative relocations. There should be only a
+ single R_*_RELATIVE relocation in GOT. */
+ if (eh != NULL)
+ {
+ if (eh->got_relative_reloc_done)
+ continue;
+
+ if (!(dynamic_relative_reloc_p
+ || (RESOLVED_LOCALLY_P (info, h, htab)
+ && GENERATE_RELATIVE_RELOC_P (info, h))))
+ continue;
+
+ if (!dynamic_relative_reloc_p)
+ eh->no_finish_dynamic_symbol = 1;
+ eh->got_relative_reloc_done = 1;
+ offset = h->got.offset;
+ }
+ else
+ {
+ if (elf_x86_relative_reloc_done (abfd)[r_symndx])
+ continue;
+
+ if (!X86_LOCAL_GOT_RELATIVE_RELOC_P (is_x86_64, info,
+ isym))
+ continue;
+
+ elf_x86_relative_reloc_done (abfd)[r_symndx] = 1;
+ offset = local_got_offsets[r_symndx];
+ }
+
+ if (!elf_x86_relative_reloc_record_add (info,
+ &htab->relative_reloc,
+ irel, htab->elf.sgot,
+ sec, h, isym, offset))
+ goto error_return;
+
+ continue;
+ }
+
+ if (is_x86_64
+ && irel->r_addend == 0
+ && !ABI_64_P (info->output_bfd))
+ {
+ /* For x32, if addend is zero, treat R_X86_64_64 like
+ R_X86_64_32 and R_X86_64_SIZE64 like R_X86_64_SIZE32. */
+ if (r_type == R_X86_64_64)
+ r_type = R_X86_64_32;
+ else if (r_type == R_X86_64_SIZE64)
+ r_type = R_X86_64_SIZE32;
+ }
+
+ if (!X86_RELATIVE_RELOC_TYPE_P (is_x86_64, r_type))
+ continue;
+
+ /* Pack non-GOT relative relocations. */
+ if (is_x86_64)
+ {
+ need_copy_reloc_in_pie =
+ (bfd_link_pie (info)
+ && h != NULL
+ && (h->needs_copy
+ || eh->needs_copy
+ || (h->root.type == bfd_link_hash_undefined))
+ && (X86_PCREL_TYPE_P (true, r_type)
+ || X86_SIZE_TYPE_P (true, r_type)));
+ pc32_reloc = false;
+ }
+ else
+ {
+ need_copy_reloc_in_pie = false;
+ pc32_reloc = r_type == R_386_PC32;
+ }
+
+ if (GENERATE_DYNAMIC_RELOCATION_P (is_x86_64, info, eh, r_type,
+ sec, need_copy_reloc_in_pie,
+ resolved_to_zero, pc32_reloc))
+ {
+ /* When generating a shared object, these relocations
+ are copied into the output file to be resolved at run
+ time. */
+ offset = _bfd_elf_section_offset (info->output_bfd, info,
+ input_section,
+ irel->r_offset);
+ if (offset == (bfd_vma) -1
+ || offset == (bfd_vma) -2
+ || COPY_INPUT_RELOC_P (is_x86_64, info, h, r_type))
+ continue;
+
+ /* This symbol is local, or marked to become local. When
+ relocation overflow check is disabled, we convert
+ R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
+ if (is_x86_64
+ && !(r_type == htab->pointer_r_type
+ || (r_type == R_X86_64_32
+ && htab->params->no_reloc_overflow_check)))
+ continue;
+
+ if (!elf_x86_relative_reloc_record_add
+ (info,
+ ((unaligned_section || unaligned_offset)
+ ? &htab->unaligned_relative_reloc
+ : &htab->relative_reloc),
+ irel, input_section, sec, h, isym, offset))
+ goto error_return;
+ }
+ }
+
+ input_section->relative_reloc_packed = 1;
+
+ return true;
+
+error_return:
+ if ((unsigned char *) isymbuf != symtab_hdr->contents)
+ free (isymbuf);
+ if (elf_section_data (input_section)->relocs != internal_relocs)
+ free (internal_relocs);
+ return false;
+}
+
+/* Add an entry to the 64-bit DT_RELR bitmap. */
+
+static void
+elf64_dt_relr_bitmap_add
+ (struct bfd_link_info *info, struct elf_dt_relr_bitmap *bitmap,
+ uint64_t entry)
+{
+ bfd_size_type newidx;
+
+ if (bitmap->u.elf64 == NULL)
+ {
+ bitmap->u.elf64 = bfd_malloc (sizeof (uint64_t));
+ bitmap->count = 0;
+ bitmap->size = 1;
+ }
+
+ newidx = bitmap->count++;
+
+ if (bitmap->count > bitmap->size)
+ {
+ bitmap->size <<= 1;
+ bitmap->u.elf64 = bfd_realloc (bitmap->u.elf64,
+ (bitmap->size * sizeof (uint64_t)));
+ }
+
+ if (bitmap->u.elf64 == NULL)
+ {
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: failed to allocate 64-bit DT_RELR bitmap\n"),
+ info->output_bfd);
+ }
+
+ bitmap->u.elf64[newidx] = entry;
+}
+
+/* Add an entry to the 32-bit DT_RELR bitmap. */
+
+static void
+elf32_dt_relr_bitmap_add
+ (struct bfd_link_info *info, struct elf_dt_relr_bitmap *bitmap,
+ uint32_t entry)
+{
+ bfd_size_type newidx;
+
+ if (bitmap->u.elf32 == NULL)
+ {
+ bitmap->u.elf32 = bfd_malloc (sizeof (uint32_t));
+ bitmap->count = 0;
+ bitmap->size = 1;
+ }
+
+ newidx = bitmap->count++;
+
+ if (bitmap->count > bitmap->size)
+ {
+ bitmap->size <<= 1;
+ bitmap->u.elf32 = bfd_realloc (bitmap->u.elf32,
+ (bitmap->size * sizeof (uint32_t)));
+ }
+
+ if (bitmap->u.elf32 == NULL)
+ {
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: failed to allocate 32-bit DT_RELR bitmap\n"),
+ info->output_bfd);
+ }
+
+ bitmap->u.elf32[newidx] = entry;
+}
+
+void
+_bfd_elf32_write_addend (bfd *abfd, uint64_t value, void *addr)
+{
+ bfd_put_32 (abfd, value, addr);
+}
+
+void
+_bfd_elf64_write_addend (bfd *abfd, uint64_t value, void *addr)
+{
+ bfd_put_64 (abfd, value, addr);
+}
+
+/* Size or finish relative relocations to determine the run-time
+ addresses for DT_RELR bitmap computation later. OUTREL is set
+ to NULL in the sizing phase and non-NULL in the finising phase
+ where the regular relative relocations will be written out. */
+
+static void
+elf_x86_size_or_finish_relative_reloc
+ (bool is_x86_64, struct bfd_link_info *info,
+ struct elf_x86_link_hash_table *htab, bool unaligned,
+ Elf_Internal_Rela *outrel)
+{
+ unsigned int align_mask;
+ bfd_size_type i, count;
+ asection *sec, *srel;
+ struct elf_link_hash_entry *h;
+ bfd_vma offset;
+ Elf_Internal_Sym *sym;
+ asection *sym_sec;
+ asection *sgot = htab->elf.sgot;
+ asection *srelgot = htab->elf.srelgot;
+ struct elf_x86_relative_reloc_data *relative_reloc;
+
+ if (unaligned)
+ {
+ align_mask = 0;
+ relative_reloc = &htab->unaligned_relative_reloc;
+ }
+ else
+ {
+ align_mask = 1;
+ relative_reloc = &htab->relative_reloc;
+ }
+
+ count = relative_reloc->count;
+ for (i = 0; i < count; i++)
+ {
+ sec = relative_reloc->data[i].sec;
+ sym = relative_reloc->data[i].sym;
+
+ /* If SYM is NULL, it must be a global symbol. */
+ if (sym == NULL)
+ h = relative_reloc->data[i].u.h;
+ else
+ h = NULL;
+
+ if (is_x86_64)
+ {
+ bfd_vma relocation;
+ /* This function may be called more than once and REL may be
+ updated by _bfd_elf_rela_local_sym below. */
+ Elf_Internal_Rela rel = relative_reloc->data[i].rel;
+
+ if (h != NULL)
+ {
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ {
+ sym_sec = h->root.u.def.section;
+ relocation = (h->root.u.def.value
+ + sym_sec->output_section->vma
+ + sym_sec->output_offset);
+ }
+ else
+ {
+ /* Allow undefined symbol only at the sizing phase.
+ Otherwise skip undefined symbol here. Undefined
+ symbol will be reported by relocate_section. */
+ if (outrel == NULL)
+ relocation = 0;
+ else
+ continue;
+ }
+ }
+ else
+ {
+ sym_sec = relative_reloc->data[i].u.sym_sec;
+ relocation = _bfd_elf_rela_local_sym
+ (info->output_bfd, sym, &sym_sec, &rel);
+ }
+
+ if (outrel != NULL)
+ {
+ outrel->r_addend = relocation;
+ if (sec == sgot)
+ {
+ if (h != NULL && h->needs_plt)
+ abort ();
+ }
+ else
+ outrel->r_addend += rel.r_addend;
+
+ /* Write the implicit addend if ALIGN_MASK isn't 0. */
+ if (align_mask)
+ {
+ if (sec == sgot)
+ {
+ if (relative_reloc->data[i].offset >= sec->size)
+ abort ();
+ htab->elf_write_addend_in_got
+ (info->output_bfd, outrel->r_addend,
+ sec->contents + relative_reloc->data[i].offset);
+ }
+ else
+ {
+ bfd_byte *contents;
+
+ if (rel.r_offset >= sec->size)
+ abort ();
+
+ if (elf_section_data (sec)->this_hdr.contents
+ != NULL)
+ contents
+ = elf_section_data (sec)->this_hdr.contents;
+ else
+ {
+ if (!bfd_malloc_and_get_section (sec->owner,
+ sec,
+ &contents))
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: failed to allocate memory for section `%pA'\n"),
+ info->output_bfd, sec);
+
+ /* Cache the section contents for
+ elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents
+ = contents;
+ }
+ htab->elf_write_addend
+ (info->output_bfd, outrel->r_addend,
+ contents + rel.r_offset);
+ }
+ }
+ }
+ }
+
+ if (sec == sgot)
+ srel = srelgot;
+ else
+ srel = elf_section_data (sec)->sreloc;
+ offset = (sec->output_section->vma + sec->output_offset
+ + relative_reloc->data[i].offset);
+ relative_reloc->data[i].address = offset;
+ if (outrel != NULL)
+ {
+ outrel->r_offset = offset;
+
+ if ((outrel->r_offset & align_mask) != 0)
+ abort ();
+
+ if (htab->params->report_relative_reloc)
+ _bfd_x86_elf_link_report_relative_reloc
+ (info, sec, h, sym, htab->relative_r_name, outrel);
+
+ /* Generate regular relative relocation if ALIGN_MASK is 0. */
+ if (align_mask == 0)
+ htab->elf_append_reloc (info->output_bfd, srel, outrel);
+ }
+ }
+}
+
+/* Compute the DT_RELR section size. Set NEED_PLAYOUT to true if
+ the DT_RELR section size has been increased. */
+
+static void
+elf_x86_compute_dl_relr_bitmap
+ (struct bfd_link_info *info, struct elf_x86_link_hash_table *htab,
+ bool *need_layout)
+{
+ bfd_vma base;
+ bfd_size_type i, count, new_count;
+ struct elf_x86_relative_reloc_data *relative_reloc =
+ &htab->relative_reloc;
+ /* Save the old DT_RELR bitmap count. Don't shrink the DT_RELR bitmap
+ if the new DT_RELR bitmap count is smaller than the old one. Pad
+ with trailing 1s which won't be decoded to more relocations. */
+ bfd_size_type dt_relr_bitmap_count = htab->dt_relr_bitmap.count;
+
+ /* Clear the DT_RELR bitmap count. */
+ htab->dt_relr_bitmap.count = 0;
+
+ count = relative_reloc->count;
+
+ if (ABI_64_P (info->output_bfd))
+ {
+ /* Compute the 64-bit DT_RELR bitmap. */
+ i = 0;
+ while (i < count)
+ {
+ if ((relative_reloc->data[i].address % 1) != 0)
+ abort ();
+
+ elf64_dt_relr_bitmap_add (info, &htab->dt_relr_bitmap,
+ relative_reloc->data[i].address);
+
+ base = relative_reloc->data[i].address + 8;
+ i++;
+
+ while (i < count)
+ {
+ uint64_t bitmap = 0;
+ for (; i < count; i++)
+ {
+ bfd_vma delta = (relative_reloc->data[i].address
+ - base);
+ /* Stop if it is too far from base. */
+ if (delta >= 63 * 8)
+ break;
+ /* Stop if it isn't a multiple of 8. */
+ if ((delta % 8) != 0)
+ break;
+ bitmap |= 1ULL << (delta / 8);
+ }
+
+ if (bitmap == 0)
+ break;
+
+ elf64_dt_relr_bitmap_add (info, &htab->dt_relr_bitmap,
+ (bitmap << 1) | 1);
+
+ base += 63 * 8;
+ }
+ }
+
+ new_count = htab->dt_relr_bitmap.count;
+ if (dt_relr_bitmap_count > new_count)
+ {
+ /* Don't shrink the DT_RELR section size to avoid section
+ layout oscillation. Instead, pad the DT_RELR bitmap with
+ 1s which do not decode to more relocations. */
+
+ htab->dt_relr_bitmap.count = dt_relr_bitmap_count;
+ count = dt_relr_bitmap_count - new_count;
+ for (i = 0; i < count; i++)
+ htab->dt_relr_bitmap.u.elf64[new_count + i] = 1;
+ }
+ }
+ else
+ {
+ /* Compute the 32-bit DT_RELR bitmap. */
+ i = 0;
+ while (i < count)
+ {
+ if ((relative_reloc->data[i].address % 1) != 0)
+ abort ();
+
+ elf32_dt_relr_bitmap_add (info, &htab->dt_relr_bitmap,
+ relative_reloc->data[i].address);
+
+ base = relative_reloc->data[i].address + 4;
+ i++;
+
+ while (i < count)
+ {
+ uint32_t bitmap = 0;
+ for (; i < count; i++)
+ {
+ bfd_vma delta = (relative_reloc->data[i].address
+ - base);
+ /* Stop if it is too far from base. */
+ if (delta >= 31 * 4)
+ break;
+ /* Stop if it isn't a multiple of 4. */
+ if ((delta % 4) != 0)
+ break;
+ bitmap |= 1ULL << (delta / 4);
+ }
+
+ if (bitmap == 0)
+ break;
+
+ elf32_dt_relr_bitmap_add (info, &htab->dt_relr_bitmap,
+ (bitmap << 1) | 1);
+
+ base += 31 * 4;
+ }
+ }
+
+ new_count = htab->dt_relr_bitmap.count;
+ if (dt_relr_bitmap_count > new_count)
+ {
+ /* Don't shrink the DT_RELR section size to avoid section
+ layout oscillation. Instead, pad the DT_RELR bitmap with
+ 1s which do not decode to more relocations. */
+
+ htab->dt_relr_bitmap.count = dt_relr_bitmap_count;
+ count = dt_relr_bitmap_count - new_count;
+ for (i = 0; i < count; i++)
+ htab->dt_relr_bitmap.u.elf32[new_count + i] = 1;
+ }
+ }
+
+ if (htab->dt_relr_bitmap.count != dt_relr_bitmap_count)
+ {
+ if (need_layout)
+ {
+ /* The .relr.dyn section size is changed. Update the section
+ size and tell linker to layout sections again. */
+ htab->elf.srelrdyn->size =
+ (htab->dt_relr_bitmap.count
+ * (ABI_64_P (info->output_bfd) ? 8 : 4));
+
+ *need_layout = true;
+ }
+ else
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: size of compact relative reloc section is "
+ "changed: new (%lu) != old (%lu)\n"),
+ info->output_bfd, htab->dt_relr_bitmap.count,
+ dt_relr_bitmap_count);
+ }
+}
+
+/* Write out the DT_RELR section. */
+
+static void
+elf_x86_write_dl_relr_bitmap (struct bfd_link_info *info,
+ struct elf_x86_link_hash_table *htab)
+{
+ asection *sec = htab->elf.srelrdyn;
+ bfd_size_type size = sec->size;
+ bfd_size_type i;
+ unsigned char *contents;
+
+ contents = (unsigned char *) bfd_alloc (sec->owner, size);
+ if (contents == NULL)
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: failed to allocate compact relative reloc section\n"),
+ info->output_bfd);
+
+ /* Cache the section contents for elf_link_input_bfd. */
+ sec->contents = contents;
+
+ if (ABI_64_P (info->output_bfd))
+ for (i = 0; i < htab->dt_relr_bitmap.count; i++, contents += 8)
+ bfd_put_64 (info->output_bfd, htab->dt_relr_bitmap.u.elf64[i],
+ contents);
+ else
+ for (i = 0; i < htab->dt_relr_bitmap.count; i++, contents += 4)
+ bfd_put_32 (info->output_bfd, htab->dt_relr_bitmap.u.elf32[i],
+ contents);
+}
+
+/* Sort relative relocations by address. */
+
+static int
+elf_x86_relative_reloc_compare (const void *pa, const void *pb)
+{
+ struct elf_x86_relative_reloc_record *a =
+ (struct elf_x86_relative_reloc_record *) pa;
+ struct elf_x86_relative_reloc_record *b =
+ (struct elf_x86_relative_reloc_record *) pb;
+ if (a->address < b->address)
+ return -1;
+ if (a->address > b->address)
+ return 1;
+ return 0;
+}
+
+enum dynobj_sframe_plt_type
+{
+ SFRAME_PLT = 1,
+ SFRAME_PLT_SEC = 2
+};
+
+/* Create SFrame stack trace info for the plt entries in the .plt section
+ of type PLT_SEC_TYPE. */
+
+static bool
+_bfd_x86_elf_create_sframe_plt (bfd *output_bfd,
+ struct bfd_link_info *info,
+ unsigned int plt_sec_type)
+{
+ struct elf_x86_link_hash_table *htab;
+ const struct elf_backend_data *bed;
+
+ bool plt0_generated_p;
+ unsigned int plt0_entry_size;
+ unsigned char func_info;
+ unsigned int fre_type;
+ /* The dynamic plt section for which .sframe stack trace information is being
+ created. */
+ asection *dpltsec;
+
+ int err = 0;
+
+ sframe_encoder_ctx **ectx = NULL;
+ unsigned plt_entry_size = 0;
+ unsigned int num_pltn_fres = 0;
+ unsigned int num_pltn_entries = 0;
+
+ bed = get_elf_backend_data (output_bfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ /* Whether SFrame stack trace info for plt0 is to be generated. */
+ plt0_generated_p = htab->plt.has_plt0;
+ plt0_entry_size
+ = (plt0_generated_p) ? htab->sframe_plt->plt0_entry_size : 0;
+
+ switch (plt_sec_type)
+ {
+ case SFRAME_PLT:
+ {
+ ectx = &htab->plt_cfe_ctx;
+ dpltsec = htab->elf.splt;
+
+ plt_entry_size = htab->plt.plt_entry_size;
+ num_pltn_fres = htab->sframe_plt->pltn_num_fres;
+ num_pltn_entries
+ = (htab->elf.splt->size - plt0_entry_size) / plt_entry_size;
+
+ break;
+ }
+ case SFRAME_PLT_SEC:
+ {
+ ectx = &htab->plt_second_cfe_ctx;
+ /* FIXME - this or htab->plt_second_sframe ? */
+ dpltsec = htab->plt_second_eh_frame;
+
+ plt_entry_size = htab->sframe_plt->sec_pltn_entry_size;
+ num_pltn_fres = htab->sframe_plt->sec_pltn_num_fres;
+ num_pltn_entries
+ = htab->plt_second_eh_frame->size / plt_entry_size;
+ break;
+ }
+ default:
+ /* No other value is possible. */
+ return false;
+ break;
+ }
+
+ *ectx = sframe_encode (SFRAME_VERSION_1,
+ 0,
+ SFRAME_ABI_AMD64_ENDIAN_LITTLE,
+ SFRAME_CFA_FIXED_FP_INVALID,
+ -8, /* Fixed RA offset. */
+ &err);
+
+ /* FRE type is dependent on the size of the function. */
+ fre_type = sframe_calc_fre_type (dpltsec->size);
+ func_info = sframe_fde_create_func_info (fre_type, SFRAME_FDE_TYPE_PCINC);
+
+ /* Add SFrame FDE and the associated FREs for plt0 if plt0 has been
+ generated. */
+ if (plt0_generated_p)
+ {
+ /* Add SFrame FDE for plt0, the function start address is updated later
+ at _bfd_elf_merge_section_sframe time. */
+ sframe_encoder_add_funcdesc (*ectx,
+ 0, /* func start addr. */
+ plt0_entry_size,
+ func_info,
+ 0 /* Num FREs. */);
+ sframe_frame_row_entry plt0_fre;
+ unsigned int num_plt0_fres = htab->sframe_plt->plt0_num_fres;
+ for (unsigned int j = 0; j < num_plt0_fres; j++)
+ {
+ plt0_fre = *(htab->sframe_plt->plt0_fres[j]);
+ sframe_encoder_add_fre (*ectx, 0, &plt0_fre);
+ }
+ }
+
+
+ if (num_pltn_entries)
+ {
+ /* pltn entries use an SFrame FDE of type
+ SFRAME_FDE_TYPE_PCMASK to exploit the repetitive
+ pattern of the instructions in these entries. Using this SFrame FDE
+ type helps in keeping the SFrame stack trace info for pltn entries
+ compact. */
+ func_info = sframe_fde_create_func_info (fre_type,
+ SFRAME_FDE_TYPE_PCMASK);
+ /* Add the SFrame FDE for all PCs starting at the first pltn entry (hence,
+ function start address = plt0_entry_size. As usual, this will be
+ updated later at _bfd_elf_merge_section_sframe, by when the
+ sections are relocated. */
+ sframe_encoder_add_funcdesc (*ectx,
+ plt0_entry_size, /* func start addr. */
+ dpltsec->size - plt0_entry_size,
+ func_info,
+ 0 /* Num FREs. */);
+
+ sframe_frame_row_entry pltn_fre;
+ /* Now add the FREs for pltn. Simply adding the two FREs suffices due
+ to the usage of SFRAME_FDE_TYPE_PCMASK above. */
+ for (unsigned int j = 0; j < num_pltn_fres; j++)
+ {
+ pltn_fre = *(htab->sframe_plt->pltn_fres[j]);
+ sframe_encoder_add_fre (*ectx, 1, &pltn_fre);
+ }
+ }
+
+ return true;
+}
+
+/* Put contents of the .sframe section corresponding to the specified
+ PLT_SEC_TYPE. */
-static void
-elf_x86_linker_defined (struct bfd_link_info *info, const char *name)
+static bool
+_bfd_x86_elf_write_sframe_plt (bfd *output_bfd,
+ struct bfd_link_info *info,
+ unsigned int plt_sec_type)
{
- struct elf_link_hash_entry *h;
+ struct elf_x86_link_hash_table *htab;
+ const struct elf_backend_data *bed;
+ sframe_encoder_ctx *ectx;
+ size_t sec_size;
+ asection *sec;
+ bfd *dynobj;
- h = elf_link_hash_lookup (elf_hash_table (info), name,
- false, false, false);
- if (h == NULL)
- return;
+ int err = 0;
- while (h->root.type == bfd_link_hash_indirect)
- h = (struct elf_link_hash_entry *) h->root.u.i.link;
+ bed = get_elf_backend_data (output_bfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ dynobj = htab->elf.dynobj;
- 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))
+ switch (plt_sec_type)
{
- elf_x86_hash_entry (h)->local_ref = 2;
- elf_x86_hash_entry (h)->linker_def = 1;
+ case SFRAME_PLT:
+ ectx = htab->plt_cfe_ctx;
+ sec = htab->plt_sframe;
+ break;
+ case SFRAME_PLT_SEC:
+ ectx = htab->plt_second_cfe_ctx;
+ sec = htab->plt_second_sframe;
+ break;
+ default:
+ /* No other value is possible. */
+ return false;
+ break;
}
-}
-/* Hide a linker-defined symbol, NAME, with hidden visibility. */
+ BFD_ASSERT (ectx);
-static void
-elf_x86_hide_linker_defined (struct bfd_link_info *info,
- const char *name)
-{
- struct elf_link_hash_entry *h;
+ void *contents = sframe_encoder_write (ectx, &sec_size, &err);
- h = elf_link_hash_lookup (elf_hash_table (info), name,
- false, false, false);
- if (h == NULL)
- return;
+ sec->size = (bfd_size_type) sec_size;
+ sec->contents = (unsigned char *) bfd_zalloc (dynobj, sec->size);
+ memcpy (sec->contents, contents, sec_size);
- while (h->root.type == bfd_link_hash_indirect)
- h = (struct elf_link_hash_entry *) h->root.u.i.link;
+ sframe_encoder_free (&ectx);
- if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
- || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
- _bfd_elf_link_hash_hide_symbol (info, h, true);
+ return true;
}
bool
-_bfd_x86_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
+_bfd_elf_x86_size_relative_relocs (struct bfd_link_info *info,
+ bool *need_layout)
{
- if (!bfd_link_relocatable (info))
+ struct elf_x86_link_hash_table *htab;
+ const struct elf_backend_data *bed;
+ bool is_x86_64;
+ bfd_size_type i, count, unaligned_count;
+ asection *sec, *srel;
+
+ /* Do nothing for ld -r. */
+ if (bfd_link_relocatable (info))
+ return true;
+
+ bed = get_elf_backend_data (info->output_bfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab == NULL)
+ return false;
+
+ count = htab->relative_reloc.count;
+ unaligned_count = htab->unaligned_relative_reloc.count;
+ if (count == 0)
{
- /* 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->generate_relative_reloc_pass == 0
+ && htab->elf.srelrdyn != NULL)
{
- 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)
+ /* Remove the empty .relr.dyn sections now. */
+ if (!bfd_is_abs_section (htab->elf.srelrdyn->output_section))
{
- 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;
- }
+ bfd_section_list_remove
+ (info->output_bfd, htab->elf.srelrdyn->output_section);
+ info->output_bfd->section_count--;
}
+ bfd_section_list_remove (htab->elf.srelrdyn->owner,
+ htab->elf.srelrdyn);
+ htab->elf.srelrdyn->owner->section_count--;
+ }
+ if (unaligned_count == 0)
+ {
+ htab->generate_relative_reloc_pass++;
+ return true;
+ }
+ }
- /* "__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");
+ is_x86_64 = bed->target_id == X86_64_ELF_DATA;
- 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
+ /* Size relative relocations. */
+ if (htab->generate_relative_reloc_pass)
+ {
+ /* Reset the regular relative relocation count. */
+ for (i = 0; i < unaligned_count; i++)
+ {
+ sec = htab->unaligned_relative_reloc.data[i].sec;
+ srel = elf_section_data (sec)->sreloc;
+ srel->reloc_count = 0;
+ }
+ }
+ else
+ {
+ /* Remove the reserved space for compact relative relocations. */
+ if (count)
+ {
+ asection *sgot = htab->elf.sgot;
+ asection *srelgot = htab->elf.srelgot;
+
+ for (i = 0; i < count; i++)
{
- /* 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");
+ sec = htab->relative_reloc.data[i].sec;
+ if (sec == sgot)
+ srel = srelgot;
+ else
+ srel = elf_section_data (sec)->sreloc;
+ srel->size -= htab->sizeof_reloc;
}
}
}
- /* Invoke the regular ELF backend linker to do all the work. */
- return _bfd_elf_link_check_relocs (abfd, info);
+ /* Size unaligned relative relocations. */
+ if (unaligned_count)
+ elf_x86_size_or_finish_relative_reloc (is_x86_64, info, htab,
+ true, NULL);
+
+ if (count)
+ {
+ elf_x86_size_or_finish_relative_reloc (is_x86_64, info, htab,
+ false, NULL);
+
+ /* Sort relative relocations by addresses. We only need to
+ sort them in the first pass since the relative positions
+ won't change. */
+ if (htab->generate_relative_reloc_pass == 0)
+ qsort (htab->relative_reloc.data, count,
+ sizeof (struct elf_x86_relative_reloc_record),
+ elf_x86_relative_reloc_compare);
+
+ elf_x86_compute_dl_relr_bitmap (info, htab, need_layout);
+ }
+
+ htab->generate_relative_reloc_pass++;
+
+ return true;
+}
+
+bool
+_bfd_elf_x86_finish_relative_relocs (struct bfd_link_info *info)
+{
+ struct elf_x86_link_hash_table *htab;
+ const struct elf_backend_data *bed;
+ Elf_Internal_Rela outrel;
+ bool is_x86_64;
+ bfd_size_type count;
+
+ /* Do nothing for ld -r. */
+ if (bfd_link_relocatable (info))
+ return true;
+
+ bed = get_elf_backend_data (info->output_bfd);
+ htab = elf_x86_hash_table (info, bed->target_id);
+ if (htab == NULL)
+ return false;
+
+ is_x86_64 = bed->target_id == X86_64_ELF_DATA;
+
+ outrel.r_info = htab->r_info (0, htab->relative_r_type);
+
+ if (htab->unaligned_relative_reloc.count)
+ elf_x86_size_or_finish_relative_reloc (is_x86_64, info, htab,
+ true, &outrel);
+
+ count = htab->relative_reloc.count;
+ if (count)
+ {
+ elf_x86_size_or_finish_relative_reloc (is_x86_64, info, htab,
+ false, &outrel);
+
+ elf_x86_compute_dl_relr_bitmap (info, htab, NULL);
+
+ elf_x86_write_dl_relr_bitmap (info, htab);
+ }
+
+ return true;
}
bool
irel = *rel;
/* Only allow relocations against absolute symbol, which can be
- resolved as absolute value + addend. GOTPCREL relocations
- are allowed since absolute value + addend is stored in the
- GOT slot. */
+ resolved as absolute value + addend. GOTPCREL and GOT32
+ relocations are allowed since absolute value + addend is
+ stored in the GOT slot. */
if (bed->target_id == X86_64_ELF_DATA)
{
r_type &= ~R_X86_64_converted_reloc_bit;
else
valid_p = (r_type == R_386_32
|| r_type == R_386_16
- || r_type == R_386_8);
+ || r_type == R_386_8
+ || r_type == R_386_GOT32
+ || r_type == R_386_GOT32X);
if (valid_p)
*no_dynreloc_p = true;
= htab->non_lazy_plt->eh_frame_plt_size;
}
+ /* No need to size the .sframe section explicitly because the write-out
+ mechanism is different. Simply prep up the FDE/FRE for the
+ .plt section. */
+ if (_bfd_elf_sframe_present (info))
+ {
+ if (htab->plt_sframe != NULL
+ && htab->elf.splt != NULL
+ && htab->elf.splt->size != 0
+ && !bfd_is_abs_section (htab->elf.splt->output_section))
+ {
+ _bfd_x86_elf_create_sframe_plt (output_bfd, info, SFRAME_PLT);
+ /* FIXME - Dirty Hack. Set the size to something non-zero for now,
+ so that the section does not get stripped out below. The precise
+ size of this section is known only when the contents are
+ serialized in _bfd_x86_elf_write_sframe_plt. */
+ htab->plt_sframe->size = sizeof (sframe_header) + 1;
+ }
+
+ /* FIXME - generate for .got.plt ? */
+
+ /* Unwind info for the second PLT. */
+ if (htab->plt_second_sframe != NULL
+ && htab->plt_second != NULL
+ && htab->plt_second->size != 0
+ && !bfd_is_abs_section (htab->plt_second->output_section))
+ {
+ _bfd_x86_elf_create_sframe_plt (output_bfd, info,
+ SFRAME_PLT_SEC);
+ /* FIXME - Dirty Hack. Set the size to something non-zero for now,
+ so that the section does not get stripped out below. The precise
+ size of this section is known only when the contents are
+ serialized in _bfd_x86_elf_write_sframe_plt. */
+ htab->plt_second_sframe->size = sizeof (sframe_header) + 1;
+ }
+ }
+
/* We now have determined the sizes of the various dynamic sections.
Allocate memory for them. */
relocs = false;
if ((s->flags & SEC_LINKER_CREATED) == 0)
continue;
+ /* The .relr.dyn section for compact relative relocation will
+ be filled later. */
+ if (s == htab->elf.srelrdyn)
+ continue;
+
if (s == htab->elf.splt
|| s == htab->elf.sgot)
{
|| s == htab->plt_eh_frame
|| s == htab->plt_got_eh_frame
|| s == htab->plt_second_eh_frame
+ || s == htab->plt_sframe
+ || s == htab->plt_second_sframe
|| s == htab->elf.sdynbss
|| s == htab->elf.sdynrelro)
{
if ((s->flags & SEC_HAS_CONTENTS) == 0)
continue;
+ /* Skip allocating contents for .sframe section as it is written
+ out differently. See below. */
+ if ((s == htab->plt_sframe) || (s == htab->plt_second_sframe))
+ 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
+ PLT_FDE_LEN_OFFSET));
}
+ if (_bfd_elf_sframe_present (info))
+ {
+ if (htab->plt_sframe != NULL
+ && htab->elf.splt != NULL
+ && htab->elf.splt->size != 0
+ && htab->plt_sframe->contents == NULL)
+ _bfd_x86_elf_write_sframe_plt (output_bfd, info, SFRAME_PLT);
+
+ if (htab->plt_second_sframe != NULL
+ && htab->elf.splt != NULL
+ && htab->elf.splt->size != 0
+ && htab->plt_second_sframe->contents == NULL)
+ _bfd_x86_elf_write_sframe_plt (output_bfd, info, SFRAME_PLT_SEC);
+ }
+
return _bfd_elf_maybe_vxworks_add_dynamic_tags (output_bfd, info,
relocs);
}
}
}
+ /* Make any adjustment if necessary and merge .sframe section to
+ create the final .sframe section for output_bfd. */
+ if (htab->plt_sframe != NULL
+ && htab->plt_sframe->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_sframe->output_section != NULL)
+ {
+ bfd_vma plt_start = htab->elf.splt->output_section->vma;
+ bfd_vma sframe_start = htab->plt_sframe->output_section->vma
+ + htab->plt_sframe->output_offset
+ + PLT_SFRAME_FDE_START_OFFSET;
+#if 0 /* FIXME Testing only. Remove before review. */
+ bfd_vma test_value = (plt_start - sframe_start)
+ + htab->plt_sframe->output_section->vma
+ + htab->plt_sframe->output_offset
+ + PLT_SFRAME_FDE_START_OFFSET;
+ bfd_put_signed_32 (dynobj, test_value,
+#endif
+ bfd_put_signed_32 (dynobj, plt_start - sframe_start,
+ htab->plt_sframe->contents
+ + PLT_SFRAME_FDE_START_OFFSET);
+ }
+ if (htab->plt_sframe->sec_info_type == SEC_INFO_TYPE_SFRAME)
+ {
+ if (! _bfd_elf_merge_section_sframe (output_bfd, info,
+ htab->plt_sframe,
+ htab->plt_sframe->contents))
+ return NULL;
+ }
+ }
+
+ if (htab->plt_second_sframe != NULL
+ && htab->plt_second_sframe->contents != NULL)
+ {
+ 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_sframe->output_section != NULL)
+ {
+ bfd_vma plt_start = htab->plt_second->output_section->vma;
+ bfd_vma sframe_start
+ = (htab->plt_second_sframe->output_section->vma
+ + htab->plt_second_sframe->output_offset
+ + PLT_SFRAME_FDE_START_OFFSET);
+#if 0 /* FIXME Testing only. Remove before review. */
+ bfd_vma test_value = (plt_start - sframe_start)
+ + htab->plt_second_sframe->output_section->vma
+ + htab->plt_second_sframe->output_offset
+ + PLT_SFRAME_FDE_START_OFFSET;
+ bfd_put_signed_32 (dynobj, test_value,
+#endif
+ bfd_put_signed_32 (dynobj, plt_start - sframe_start,
+ htab->plt_second_sframe->contents
+ + PLT_SFRAME_FDE_START_OFFSET);
+ }
+ if (htab->plt_second_sframe->sec_info_type == SEC_INFO_TYPE_SFRAME)
+ {
+ if (! _bfd_elf_merge_section_sframe (output_bfd, info,
+ htab->plt_second_sframe,
+ htab->plt_second_sframe->contents))
+ return NULL;
+ }
+ }
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;
{
asection *tls_sec = elf_hash_table (info)->tls_sec;
- if (tls_sec)
+ if (tls_sec && !bfd_link_relocatable (info))
{
struct elf_link_hash_entry *tlsbase;
const char *name;
bfd *abfd;
const Elf_Internal_Rela *rel = (const Elf_Internal_Rela *) reloc;
- char r_offset[30], r_info[30];
/* Use the output BFD for linker created sections. */
if ((asect->flags & SEC_LINKER_CREATED) != 0)
else
name = bfd_elf_sym_name (abfd, &elf_symtab_hdr (abfd), sym, NULL);
- bfd_sprintf_vma (abfd, r_offset, rel->r_offset);
- bfd_sprintf_vma (abfd, r_info, rel->r_info);
-
if (asect->use_rela_p)
- {
- char r_addend[30];
-
- bfd_sprintf_vma (abfd, r_addend, rel->r_addend);
-
- info->callbacks->einfo
- (_("%pB: %s (offset: 0x%s, info: 0x%s, addend: 0x%s) against "
- "'%s' " "for section '%pA' in %pB\n"),
- info->output_bfd, reloc_name, r_offset, r_info, r_addend,
- name, asect, abfd);
- }
+ info->callbacks->einfo
+ (_("%pB: %s (offset: 0x%v, info: 0x%v, addend: 0x%v) against "
+ "'%s' " "for section '%pA' in %pB\n"),
+ info->output_bfd, reloc_name, rel->r_offset, rel->r_info,
+ rel->r_addend, name, asect, abfd);
else
info->callbacks->einfo
- (_("%pB: %s (offset: 0x%s, info: 0x%s) against '%s' for section "
+ (_("%pB: %s (offset: 0x%v, info: 0x%v) against '%s' for section "
"'%pA' in %pB\n"),
- info->output_bfd, reloc_name, r_offset, r_info, name,
+ info->output_bfd, reloc_name, rel->r_offset, rel->r_info, name,
asect, abfd);
}
}
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
{
+ if (eh->def_protected && bfd_link_executable (info))
+ for (p = h->dyn_relocs; p != NULL; p = p->next)
+ {
+ /* Disallow copy relocation against non-copyable protected
+ symbol. */
+ s = p->sec->output_section;
+ if (s != NULL && (s->flags & SEC_READONLY) != 0)
+ {
+ info->callbacks->einfo
+ /* xgettext:c-format */
+ (_("%F%P: %pB: copy relocation against non-copyable "
+ "protected symbol `%s' in %pB\n"),
+ p->sec->owner, h->root.root.string,
+ h->root.u.def.section->owner);
+ return false;
+ }
+ }
+
srel->size += htab->sizeof_reloc;
h->needs_copy = 1;
}
2. When building executable, there is no dynamic linker. Or
3. or "-z nodynamic-undefined-weak" is used.
*/
- if (SYMBOL_REFERENCES_LOCAL (info, h)
+ if (_bfd_elf_symbol_refs_local_p (h, info, 1)
|| (h->root.type == bfd_link_hash_undefweak
&& (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
|| (bfd_link_executable (info)
pltsec = htab->elf.splt;
- /* If the non-lazy PLT is available, use it for all PLT entries if
- there are no PLT0 or no .plt section. */
if (htab->non_lazy_plt != NULL
&& (!htab->plt.has_plt0 || pltsec == NULL))
+ lazy_plt = false;
+ else
+ lazy_plt = true;
+
+ if (normal_target)
+ {
+ if (use_ibt_plt)
+ {
+ if (lazy_plt)
+ htab->sframe_plt = init_table->sframe_lazy_ibt_plt;
+ else
+ htab->sframe_plt = init_table->sframe_non_lazy_ibt_plt;
+ }
+ else
+ {
+ if (lazy_plt)
+ htab->sframe_plt = init_table->sframe_lazy_plt;
+ else
+ htab->sframe_plt = init_table->sframe_non_lazy_plt;
+ }
+ }
+ else
+ htab->sframe_plt = NULL;
+
+ /* If the non-lazy PLT is available, use it for all PLT entries if
+ there are no PLT0 or no .plt section. */
+ if (!lazy_plt)
{
- lazy_plt = false;
if (bfd_link_pic (info))
htab->plt.plt_entry = htab->non_lazy_plt->pic_plt_entry;
else
}
else
{
- lazy_plt = true;
if (bfd_link_pic (info))
{
htab->plt.plt0_entry = htab->lazy_plt->pic_plt0_entry;
if (!bfd_set_section_alignment (sec, plt_alignment))
goto error_alignment;
}
- else if (htab->params->bndplt && ABI_64_P (dynobj))
- {
- /* Create the second PLT for Intel MPX support. MPX
- PLT is supported only in 64-bit mode and is needed
- only for lazy binding. */
- sec = bfd_make_section_anyway_with_flags (dynobj,
- ".plt.sec",
- pltflags);
- if (sec == NULL)
- info->callbacks->einfo (_("%F%P: failed to create BND PLT section\n"));
-
- if (!bfd_set_section_alignment (sec, non_lazy_plt_alignment))
- goto error_alignment;
- }
htab->plt_second = sec;
}
htab->plt_second_eh_frame = sec;
}
}
+
+ /* .sframe sections are emitted for AMD64 ABI only. */
+ if (ABI_64_P (info->output_bfd) && !info->no_ld_generated_unwind_info)
+ {
+ flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
+ | SEC_HAS_CONTENTS | SEC_IN_MEMORY
+ | SEC_LINKER_CREATED);
+
+ sec = bfd_make_section_anyway_with_flags (dynobj,
+ ".sframe",
+ flags);
+ if (sec == NULL)
+ info->callbacks->einfo (_("%F%P: failed to create PLT .sframe section\n"));
+
+ // FIXME check this
+ // if (!bfd_set_section_alignment (sec, class_align))
+ // goto error_alignment;
+
+ htab->plt_sframe = sec;
+
+ /* Second PLT is generated for Intel IBT + lazy plt. */
+ if (htab->plt_second != NULL)
+ {
+ sec = bfd_make_section_anyway_with_flags (dynobj,
+ ".sframe",
+ flags);
+ if (sec == NULL)
+ info->callbacks->einfo (_("%F%P: failed to create second PLT .sframe section\n"));
+
+ htab->plt_second_sframe = sec;
+ }
+ /* FIXME - add later for plt_got. */
+ }
}
/* The .iplt section is used for IFUNC symbols in static
projects / binutils-gdb.git / blobdiff