[thirdparty/binutils-gdb.git] / bfd / elfxx-x86.h

/* x86 specific support for ELF
   Copyright (C) 2017 Free Software Foundation, Inc.

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "bfd_stdint.h"
#include "hashtab.h"

#define PLT_CIE_LENGTH		20
#define PLT_FDE_LENGTH		36
#define PLT_FDE_START_OFFSET	4 + PLT_CIE_LENGTH + 8
#define PLT_FDE_LEN_OFFSET	4 + PLT_CIE_LENGTH + 12

#define ABI_64_P(abfd) \
  (get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)

/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
   copying dynamic variables from a shared lib into an app's dynbss
   section, and instead use a dynamic relocation to point into the
   shared lib.  */
#define ELIMINATE_COPY_RELOCS 1

#define elf_x86_hash_table(p, id) \
  (is_elf_hash_table ((p)->hash) \
   && elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
    ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)

/* Will references to this symbol always be local in this object?  */
#define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \
  _bfd_x86_elf_link_symbol_references_local ((INFO), (H))

/* Is a undefined weak symbol which is resolved to 0.  Reference to an
   undefined weak symbol is resolved to 0 when building executable if
   it isn't dynamic and
   1. Has non-GOT/non-PLT relocations in text section.  Or
   2. Has no GOT/PLT relocation.
   Local undefined weak symbol is always resolved to 0.
 */
#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
  ((EH)->elf.root.type == bfd_link_hash_undefweak		 \
   && (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf)		 \
       || (bfd_link_executable (INFO)				 \
	   && (!(EH)->has_got_reloc				 \
	       || (EH)->has_non_got_reloc))))

/* Should copy relocation be generated for a symbol.  Don't generate
   copy relocation against a protected symbol defined in a shared
   object with GNU_PROPERTY_NO_COPY_ON_PROTECTED.  */
#define SYMBOL_NO_COPYRELOC(INFO, EH) \
  ((EH)->def_protected \
   && ((EH)->elf.root.type == bfd_link_hash_defined \
       || (EH)->elf.root.type == bfd_link_hash_defweak) \
   && elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
   && ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
   && ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)

/* x86 ELF linker hash entry.  */

struct elf_x86_link_hash_entry
{
  struct elf_link_hash_entry elf;

  /* Track dynamic relocs copied for this symbol.  */
  struct elf_dyn_relocs *dyn_relocs;

  unsigned char tls_type;

  /* TRUE if symbol has GOT or PLT relocations.  */
  unsigned int has_got_reloc : 1;

  /* TRUE if symbol has non-GOT/non-PLT relocations in text sections.  */
  unsigned int has_non_got_reloc : 1;

  /* Don't call finish_dynamic_symbol on this symbol.  */
  unsigned int no_finish_dynamic_symbol : 1;

  /* TRUE if symbol is __tls_get_addr.  */
  unsigned int tls_get_addr : 1;

  /* TRUE if symbol is defined as a protected symbol.  */
  unsigned int def_protected : 1;

  /* 0: Symbol references are unknown.
     1: Symbol references aren't local.
     2: Symbol references are local.
   */
  unsigned int local_ref : 2;

  /* TRUE if symbol is defined by linker.  */
  unsigned int linker_def : 1;

  /* TRUE if symbol is referenced by R_386_GOTOFF relocation.  This is
     only used by i386.  */
  unsigned int gotoff_ref : 1;

  /* TRUE if a weak symbol with a real definition needs a copy reloc.
     When there is a weak symbol with a real definition, the processor
     independent code will have arranged for us to see the real
     definition first.  We need to copy the needs_copy bit from the
     real definition and check it when allowing copy reloc in PIE.  This
     is only used by x86-64.  */
  unsigned int needs_copy : 1;

  /* Reference count of C/C++ function pointer relocations in read-write
     section which can be resolved at run-time.  */
  bfd_signed_vma func_pointer_refcount;

  /* Information about the GOT PLT entry. Filled when there are both
     GOT and PLT relocations against the same function.  */
  union gotplt_union plt_got;

  /* Information about the second PLT entry.   */
  union gotplt_union plt_second;

  /* Offset of the GOTPLT entry reserved for the TLS descriptor,
     starting at the end of the jump table.  */
  bfd_vma tlsdesc_got;
};

struct elf_x86_lazy_plt_layout
{
  /* The first entry in an absolute lazy procedure linkage table looks
     like this.  */
  const bfd_byte *plt0_entry;
  unsigned int plt0_entry_size;          /* Size of PLT0 entry.  */

  /* Later entries in an absolute lazy procedure linkage table look
     like this.  */
  const bfd_byte *plt_entry;
  unsigned int plt_entry_size;          /* Size of each PLT entry.  */

  /* Offsets into plt0_entry that are to be replaced with GOT[1] and
     GOT[2].  */
  unsigned int plt0_got1_offset;
  unsigned int plt0_got2_offset;

  /* Offset of the end of the PC-relative instruction containing
     plt0_got2_offset.  This is for x86-64 only.  */
  unsigned int plt0_got2_insn_end;

  /* Offsets into plt_entry that are to be replaced with...  */
  unsigned int plt_got_offset;    /* ... address of this symbol in .got. */
  unsigned int plt_reloc_offset;  /* ... offset into relocation table. */
  unsigned int plt_plt_offset;    /* ... offset to start of .plt. */

  /* Length of the PC-relative instruction containing plt_got_offset.
     This is used for x86-64 only.  */
  unsigned int plt_got_insn_size;

  /* Offset of the end of the PC-relative jump to plt0_entry.  This is
     used for x86-64 only.  */
  unsigned int plt_plt_insn_end;

  /* Offset into plt_entry where the initial value of the GOT entry
     points.  */
  unsigned int plt_lazy_offset;

  /* The first entry in a PIC lazy procedure linkage table looks like
     this.  */
  const bfd_byte *pic_plt0_entry;

  /* Subsequent entries in a PIC lazy procedure linkage table look
     like this.  */
  const bfd_byte *pic_plt_entry;

  /* .eh_frame covering the lazy .plt section.  */
  const bfd_byte *eh_frame_plt;
  unsigned int eh_frame_plt_size;
};

struct elf_x86_non_lazy_plt_layout
{
  /* Entries in an absolute non-lazy procedure linkage table look like
     this.  */
  const bfd_byte *plt_entry;
  /* Entries in a PIC non-lazy procedure linkage table look like this.  */
  const bfd_byte *pic_plt_entry;

  unsigned int plt_entry_size;          /* Size of each PLT entry.  */

  /* Offsets into plt_entry that are to be replaced with...  */
  unsigned int plt_got_offset;    /* ... address of this symbol in .got. */

  /* Length of the PC-relative instruction containing plt_got_offset.
     This is used for x86-64 only.  */
  unsigned int plt_got_insn_size;

  /* .eh_frame covering the non-lazy .plt section.  */
  const bfd_byte *eh_frame_plt;
  unsigned int eh_frame_plt_size;
};

struct elf_x86_plt_layout
{
  /* The first entry in a lazy procedure linkage table looks like this.
     This is only used for i386 where absolute PLT0 and PIC PLT0 are
     different.  */
  const bfd_byte *plt0_entry;
  /* Entries in a procedure linkage table look like this.  */
  const bfd_byte *plt_entry;
  unsigned int plt_entry_size;          /* Size of each PLT entry.  */

  /* 1 has PLT0.  */
  unsigned int has_plt0;

  /* Offsets into plt_entry that are to be replaced with...  */
  unsigned int plt_got_offset;    /* ... address of this symbol in .got. */

  /* Length of the PC-relative instruction containing plt_got_offset.
     This is only used for x86-64.  */
  unsigned int plt_got_insn_size;

  /* .eh_frame covering the .plt section.  */
  const bfd_byte *eh_frame_plt;
  unsigned int eh_frame_plt_size;
};

/* Values in tls_type of x86 ELF linker hash entry.  */
#define GOT_UNKNOWN	0
#define GOT_NORMAL	1
#define GOT_TLS_GD	2
#define GOT_TLS_IE	4
#define GOT_TLS_IE_POS	5
#define GOT_TLS_IE_NEG	6
#define GOT_TLS_IE_BOTH 7
#define GOT_TLS_GDESC	8
#define GOT_TLS_GD_BOTH_P(type)	\
  ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
#define GOT_TLS_GD_P(type) \
  ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
#define GOT_TLS_GDESC_P(type) \
  ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
#define GOT_TLS_GD_ANY_P(type) \
  (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))

#define elf_x86_hash_entry(ent) \
  ((struct elf_x86_link_hash_entry *)(ent))

/* x86 ELF linker hash table.  */

struct elf_x86_link_hash_table
{
  struct elf_link_hash_table elf;

  /* Short-cuts to get to dynamic linker sections.  */
  asection *interp;
  asection *plt_eh_frame;
  asection *plt_second;
  asection *plt_second_eh_frame;
  asection *plt_got;
  asection *plt_got_eh_frame;

  /* Parameters describing PLT generation, lazy or non-lazy.  */
  struct elf_x86_plt_layout plt;

  /* Parameters describing lazy PLT generation.  */
  const struct elf_x86_lazy_plt_layout *lazy_plt;

  /* Parameters describing non-lazy PLT generation.  */
  const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;

  union
  {
    bfd_signed_vma refcount;
    bfd_vma offset;
  } tls_ld_or_ldm_got;

  /* The amount of space used by the jump slots in the GOT.  */
  bfd_vma sgotplt_jump_table_size;

  /* Small local sym cache.  */
  struct sym_cache sym_cache;

  /* _TLS_MODULE_BASE_ symbol.  */
  struct bfd_link_hash_entry *tls_module_base;

  /* Used by local STT_GNU_IFUNC symbols.  */
  htab_t loc_hash_table;
  void * loc_hash_memory;

  /* The offset into sgot of the GOT entry used by the PLT entry
     above.  */
  bfd_vma tlsdesc_got;

  /* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt.  */
  bfd_vma next_jump_slot_index;
  /* The index of the next R_X86_64_IRELATIVE entry in .rela.plt.  */
  bfd_vma next_irelative_index;

  /* TRUE if there are dynamic relocs against IFUNC symbols that apply
     to read-only sections.  */
  bfd_boolean readonly_dynrelocs_against_ifunc;

  /* TRUE if this is a VxWorks x86 target.  This is only used for
     i386.  */
  bfd_boolean is_vxworks;

  /* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
     This is used for i386 only.  */
  asection *srelplt2;

  /* The index of the next unused R_386_TLS_DESC slot in .rel.plt.  This
     is only used for i386.  */
  bfd_vma next_tls_desc_index;

  /* The offset into splt of the PLT entry for the TLS descriptor
     resolver.  Special values are 0, if not necessary (or not found
     to be necessary yet), and -1 if needed but not determined
     yet.  This is only used for x86-64.  */
  bfd_vma tlsdesc_plt;

  bfd_vma (*r_info) (bfd_vma, bfd_vma);
  bfd_vma (*r_sym) (bfd_vma);
  bfd_boolean (*is_reloc_section) (const char *);
  enum elf_target_id target_id;
  unsigned int sizeof_reloc;
  unsigned int dt_reloc;
  unsigned int dt_reloc_sz;
  unsigned int dt_reloc_ent;
  unsigned int got_entry_size;
  unsigned int pointer_r_type;
  int dynamic_interpreter_size;
  const char *dynamic_interpreter;
  const char *tls_get_addr;
};

struct elf_x86_init_table
{
  /* The lazy PLT layout.  */
  const struct elf_x86_lazy_plt_layout *lazy_plt;

  /* The non-lazy PLT layout.  */
  const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;

  /* The lazy PLT layout for IBT.  */
  const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;

  /* The non-lazy PLT layout for IBT.  */
  const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;

  /* TRUE if this is a normal x86 target.  */
  bfd_boolean normal_target;

  /* TRUE if this is a VxWorks x86 target.  */
  bfd_boolean is_vxworks;

  bfd_vma (*r_info) (bfd_vma, bfd_vma);
  bfd_vma (*r_sym) (bfd_vma);
};

struct elf_x86_obj_tdata
{
  struct elf_obj_tdata root;

  /* tls_type for each local got entry.  */
  char *local_got_tls_type;

  /* GOTPLT entries for TLS descriptors.  */
  bfd_vma *local_tlsdesc_gotent;
};

enum elf_x86_plt_type
{
  plt_non_lazy = 0,
  plt_lazy = 1 << 0,
  plt_pic = 1 << 1,
  plt_second = 1 << 2,
  plt_unknown = -1
};

struct elf_x86_plt
{
  const char *name;
  asection *sec;
  bfd_byte *contents;
  enum elf_x86_plt_type type;
  unsigned int plt_got_offset;
  unsigned int plt_entry_size;
  unsigned int plt_got_insn_size;	/* Only used for x86-64.  */
  long count;
};

#define elf_x86_tdata(abfd) \
  ((struct elf_x86_obj_tdata *) (abfd)->tdata.any)

#define elf_x86_local_got_tls_type(abfd) \
  (elf_x86_tdata (abfd)->local_got_tls_type)

#define elf_x86_local_tlsdesc_gotent(abfd) \
  (elf_x86_tdata (abfd)->local_tlsdesc_gotent)

#define elf_x86_compute_jump_table_size(htab) \
  ((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)

#define is_x86_elf(bfd, htab)				\
  (bfd_get_flavour (bfd) == bfd_target_elf_flavour	\
   && elf_tdata (bfd) != NULL				\
   && elf_object_id (bfd) == (htab)->target_id)

extern bfd_boolean _bfd_x86_elf_mkobject
  (bfd *);

extern void _bfd_x86_elf_set_tls_module_base
  (struct bfd_link_info *);

extern bfd_vma _bfd_x86_elf_dtpoff_base
  (struct bfd_link_info *);

extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
  (struct elf_link_hash_entry *, void *);

extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
  (struct elf_x86_link_hash_table *, bfd *, const Elf_Internal_Rela *,
   bfd_boolean);

extern hashval_t _bfd_x86_elf_local_htab_hash
  (const void *);

extern int _bfd_x86_elf_local_htab_eq
  (const void *, const void *);

extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
  (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);

extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
  (bfd *);

extern int _bfd_x86_elf_compare_relocs
  (const void *, const void *);

extern bfd_boolean _bfd_x86_elf_link_check_relocs
  (bfd *, struct bfd_link_info *);

extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
  (bfd *, struct bfd_link_info *);

extern bfd_boolean _bfd_x86_elf_always_size_sections
  (bfd *, struct bfd_link_info *);

extern void _bfd_x86_elf_merge_symbol_attribute
  (struct elf_link_hash_entry *, const Elf_Internal_Sym *,
   bfd_boolean, bfd_boolean);

extern void _bfd_x86_elf_copy_indirect_symbol
  (struct bfd_link_info *, struct elf_link_hash_entry *,
   struct elf_link_hash_entry *);

extern bfd_boolean _bfd_x86_elf_fixup_symbol
  (struct bfd_link_info *, struct elf_link_hash_entry *);

extern bfd_boolean _bfd_x86_elf_hash_symbol
  (struct elf_link_hash_entry *);

extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
  (struct bfd_link_info *, struct elf_link_hash_entry *);

extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
  (struct bfd_link_info *, struct elf_link_hash_entry *);

extern asection * _bfd_x86_elf_gc_mark_hook
  (asection *, struct bfd_link_info *, Elf_Internal_Rela *,
   struct elf_link_hash_entry *, Elf_Internal_Sym *);

extern long _bfd_x86_elf_get_synthetic_symtab
  (bfd *, long, long, bfd_vma, struct elf_x86_plt [], asymbol **,
   asymbol **);

extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
  (bfd *, unsigned int, bfd_byte *, unsigned int);

extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
  (struct bfd_link_info *, bfd *, elf_property *, elf_property *);

extern bfd * _bfd_x86_elf_link_setup_gnu_properties
  (struct bfd_link_info *, struct elf_x86_init_table *);

#define bfd_elf64_mkobject \
  _bfd_x86_elf_mkobject
#define bfd_elf32_mkobject \
  _bfd_x86_elf_mkobject
#define bfd_elf64_bfd_link_hash_table_create \
  _bfd_x86_elf_link_hash_table_create
#define bfd_elf32_bfd_link_hash_table_create \
  _bfd_x86_elf_link_hash_table_create
#define bfd_elf64_bfd_link_check_relocs	\
  _bfd_x86_elf_link_check_relocs
#define bfd_elf32_bfd_link_check_relocs \
  _bfd_x86_elf_link_check_relocs

#define elf_backend_size_dynamic_sections \
  _bfd_x86_elf_size_dynamic_sections
#define elf_backend_always_size_sections \
  _bfd_x86_elf_always_size_sections
#define elf_backend_merge_symbol_attribute \
  _bfd_x86_elf_merge_symbol_attribute
#define elf_backend_copy_indirect_symbol \
  _bfd_x86_elf_copy_indirect_symbol
#define elf_backend_fixup_symbol \
  _bfd_x86_elf_fixup_symbol
#define elf_backend_hash_symbol \
  _bfd_x86_elf_hash_symbol
#define elf_backend_adjust_dynamic_symbol \
  _bfd_x86_elf_adjust_dynamic_symbol
#define elf_backend_gc_mark_hook \
  _bfd_x86_elf_gc_mark_hook
#define elf_backend_omit_section_dynsym \
  ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
#define elf_backend_parse_gnu_properties \
  _bfd_x86_elf_parse_gnu_properties
#define elf_backend_merge_gnu_properties \
  _bfd_x86_elf_merge_gnu_properties
Commit	Line	Data
0afcef53 L	1	/* x86 specific support for ELF
	2	Copyright (C) 2017 Free Software Foundation, Inc.
	3
	4	This file is part of BFD, the Binary File Descriptor library.
	5
	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 3 of the License, or
	9	(at your option) any later version.
	10
	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	19	MA 02110-1301, USA. */
	20
	21	#include "sysdep.h"
	22	#include "bfd.h"
	23	#include "bfdlink.h"
	24	#include "libbfd.h"
	25	#include "elf-bfd.h"
	26	#include "bfd_stdint.h"
0afcef53 L	27	#include "hashtab.h"
0afcef53 L	28
aa595247 L	29	#define PLT_CIE_LENGTH 20
	30	#define PLT_FDE_LENGTH 36
	31	#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
	32	#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
	33
765e526c L	34	#define ABI_64_P(abfd) \
	35	(get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
	36
0afcef53 L	37	/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
	38	copying dynamic variables from a shared lib into an app's dynbss
	39	section, and instead use a dynamic relocation to point into the
	40	shared lib. */
	41	#define ELIMINATE_COPY_RELOCS 1
	42
	43	#define elf_x86_hash_table(p, id) \
1cf58434 AM	44	(is_elf_hash_table ((p)->hash) \
1cf58434 AM	45	&& elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
0afcef53 L	46	? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)
0afcef53 L	47
6999821f L	48	/* Will references to this symbol always be local in this object? */
	49	#define SYMBOL_REFERENCES_LOCAL_P(INFO, H) \
	50	_bfd_x86_elf_link_symbol_references_local ((INFO), (H))
	51
0afcef53 L	52	/* Is a undefined weak symbol which is resolved to 0. Reference to an
	53	undefined weak symbol is resolved to 0 when building executable if
	54	it isn't dynamic and
	55	1. Has non-GOT/non-PLT relocations in text section. Or
	56	2. Has no GOT/PLT relocation.
	57	Local undefined weak symbol is always resolved to 0.
	58	*/
c5bce5c6	59	#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
0afcef53	60	((EH)->elf.root.type == bfd_link_hash_undefweak \
6999821f	61	&& (SYMBOL_REFERENCES_LOCAL_P ((INFO), &(EH)->elf) \
0afcef53	62	\|\| (bfd_link_executable (INFO) \
c5bce5c6 L	63	&& (!(EH)->has_got_reloc \
c5bce5c6 L	64	\|\| (EH)->has_non_got_reloc))))
0afcef53 L	65
	66	/* Should copy relocation be generated for a symbol. Don't generate
	67	copy relocation against a protected symbol defined in a shared
	68	object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */
	69	#define SYMBOL_NO_COPYRELOC(INFO, EH) \
	70	((EH)->def_protected \
	71	&& ((EH)->elf.root.type == bfd_link_hash_defined \
	72	\|\| (EH)->elf.root.type == bfd_link_hash_defweak) \
	73	&& elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
	74	&& ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
	75	&& ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
	76
	77	/* x86 ELF linker hash entry. */
	78
	79	struct elf_x86_link_hash_entry
	80	{
	81	struct elf_link_hash_entry elf;
	82
	83	/* Track dynamic relocs copied for this symbol. */
	84	struct elf_dyn_relocs *dyn_relocs;
	85
	86	unsigned char tls_type;
	87
	88	/* TRUE if symbol has GOT or PLT relocations. */
	89	unsigned int has_got_reloc : 1;
	90
	91	/* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
	92	unsigned int has_non_got_reloc : 1;
	93
	94	/* Don't call finish_dynamic_symbol on this symbol. */
	95	unsigned int no_finish_dynamic_symbol : 1;
	96
	97	/* TRUE if symbol is __tls_get_addr. */
	98	unsigned int tls_get_addr : 1;
	99
	100	/* TRUE if symbol is defined as a protected symbol. */
	101	unsigned int def_protected : 1;
	102
6999821f L	103	/* 0: Symbol references are unknown.
	104	1: Symbol references aren't local.
	105	2: Symbol references are local.
	106	*/
	107	unsigned int local_ref : 2;
	108
0a27fed7 L	109	/* TRUE if symbol is defined by linker. */
	110	unsigned int linker_def : 1;
	111
f47432d4	112	/* TRUE if symbol is referenced by R_386_GOTOFF relocation. This is
c7df954f	113	only used by i386. */
0afcef53 L	114	unsigned int gotoff_ref : 1;
	115
	116	/* TRUE if a weak symbol with a real definition needs a copy reloc.
	117	When there is a weak symbol with a real definition, the processor
	118	independent code will have arranged for us to see the real
	119	definition first. We need to copy the needs_copy bit from the
	120	real definition and check it when allowing copy reloc in PIE. This
	121	is only used by x86-64. */
	122	unsigned int needs_copy : 1;
	123
	124	/* Reference count of C/C++ function pointer relocations in read-write
	125	section which can be resolved at run-time. */
	126	bfd_signed_vma func_pointer_refcount;
	127
	128	/* Information about the GOT PLT entry. Filled when there are both
	129	GOT and PLT relocations against the same function. */
	130	union gotplt_union plt_got;
	131
	132	/* Information about the second PLT entry. */
	133	union gotplt_union plt_second;
	134
	135	/* Offset of the GOTPLT entry reserved for the TLS descriptor,
	136	starting at the end of the jump table. */
	137	bfd_vma tlsdesc_got;
	138	};
	139
765e526c L	140	struct elf_x86_lazy_plt_layout
	141	{
	142	/* The first entry in an absolute lazy procedure linkage table looks
	143	like this. */
	144	const bfd_byte *plt0_entry;
	145	unsigned int plt0_entry_size; /* Size of PLT0 entry. */
	146
	147	/* Later entries in an absolute lazy procedure linkage table look
	148	like this. */
	149	const bfd_byte *plt_entry;
	150	unsigned int plt_entry_size; /* Size of each PLT entry. */
	151
	152	/* Offsets into plt0_entry that are to be replaced with GOT[1] and
	153	GOT[2]. */
	154	unsigned int plt0_got1_offset;
	155	unsigned int plt0_got2_offset;
	156
	157	/* Offset of the end of the PC-relative instruction containing
	158	plt0_got2_offset. This is for x86-64 only. */
	159	unsigned int plt0_got2_insn_end;
	160
	161	/* Offsets into plt_entry that are to be replaced with... */
	162	unsigned int plt_got_offset; /* ... address of this symbol in .got. */
	163	unsigned int plt_reloc_offset; /* ... offset into relocation table. */
	164	unsigned int plt_plt_offset; /* ... offset to start of .plt. */
	165
	166	/* Length of the PC-relative instruction containing plt_got_offset.
	167	This is used for x86-64 only. */
	168	unsigned int plt_got_insn_size;
	169
	170	/* Offset of the end of the PC-relative jump to plt0_entry. This is
	171	used for x86-64 only. */
	172	unsigned int plt_plt_insn_end;
	173
	174	/* Offset into plt_entry where the initial value of the GOT entry
	175	points. */
	176	unsigned int plt_lazy_offset;
	177
	178	/* The first entry in a PIC lazy procedure linkage table looks like
a6798bab	179	this. */
765e526c L	180	const bfd_byte *pic_plt0_entry;
	181
	182	/* Subsequent entries in a PIC lazy procedure linkage table look
a6798bab	183	like this. */
765e526c L	184	const bfd_byte *pic_plt_entry;
	185
	186	/* .eh_frame covering the lazy .plt section. */
	187	const bfd_byte *eh_frame_plt;
	188	unsigned int eh_frame_plt_size;
	189	};
	190
	191	struct elf_x86_non_lazy_plt_layout
	192	{
	193	/* Entries in an absolute non-lazy procedure linkage table look like
	194	this. */
	195	const bfd_byte *plt_entry;
a6798bab	196	/* Entries in a PIC non-lazy procedure linkage table look like this. */
765e526c L	197	const bfd_byte *pic_plt_entry;
	198
	199	unsigned int plt_entry_size; /* Size of each PLT entry. */
	200
	201	/* Offsets into plt_entry that are to be replaced with... */
	202	unsigned int plt_got_offset; /* ... address of this symbol in .got. */
	203
	204	/* Length of the PC-relative instruction containing plt_got_offset.
	205	This is used for x86-64 only. */
	206	unsigned int plt_got_insn_size;
	207
	208	/* .eh_frame covering the non-lazy .plt section. */
	209	const bfd_byte *eh_frame_plt;
	210	unsigned int eh_frame_plt_size;
	211	};
	212
	213	struct elf_x86_plt_layout
	214	{
	215	/* The first entry in a lazy procedure linkage table looks like this.
	216	This is only used for i386 where absolute PLT0 and PIC PLT0 are
	217	different. */
	218	const bfd_byte *plt0_entry;
	219	/* Entries in a procedure linkage table look like this. */
	220	const bfd_byte *plt_entry;
	221	unsigned int plt_entry_size; /* Size of each PLT entry. */
	222
	223	/* 1 has PLT0. */
	224	unsigned int has_plt0;
	225
	226	/* Offsets into plt_entry that are to be replaced with... */
	227	unsigned int plt_got_offset; /* ... address of this symbol in .got. */
	228
	229	/* Length of the PC-relative instruction containing plt_got_offset.
	230	This is only used for x86-64. */
	231	unsigned int plt_got_insn_size;
	232
	233	/* .eh_frame covering the .plt section. */
	234	const bfd_byte *eh_frame_plt;
	235	unsigned int eh_frame_plt_size;
	236	};
	237
6b9553e2	238	/* Values in tls_type of x86 ELF linker hash entry. */
0afcef53 L	239	#define GOT_UNKNOWN 0
	240	#define GOT_NORMAL 1
	241	#define GOT_TLS_GD 2
6b9553e2 L	242	#define GOT_TLS_IE 4
	243	#define GOT_TLS_IE_POS 5
	244	#define GOT_TLS_IE_NEG 6
	245	#define GOT_TLS_IE_BOTH 7
	246	#define GOT_TLS_GDESC 8
	247	#define GOT_TLS_GD_BOTH_P(type) \
	248	((type) == (GOT_TLS_GD \| GOT_TLS_GDESC))
	249	#define GOT_TLS_GD_P(type) \
	250	((type) == GOT_TLS_GD \|\| GOT_TLS_GD_BOTH_P (type))
	251	#define GOT_TLS_GDESC_P(type) \
	252	((type) == GOT_TLS_GDESC \|\| GOT_TLS_GD_BOTH_P (type))
	253	#define GOT_TLS_GD_ANY_P(type) \
	254	(GOT_TLS_GD_P (type) \|\| GOT_TLS_GDESC_P (type))
0afcef53 L	255
	256	#define elf_x86_hash_entry(ent) \
	257	((struct elf_x86_link_hash_entry *)(ent))
	258
	259	/* x86 ELF linker hash table. */
	260
	261	struct elf_x86_link_hash_table
	262	{
	263	struct elf_link_hash_table elf;
	264
	265	/* Short-cuts to get to dynamic linker sections. */
	266	asection *interp;
	267	asection *plt_eh_frame;
	268	asection *plt_second;
	269	asection *plt_second_eh_frame;
	270	asection *plt_got;
	271	asection *plt_got_eh_frame;
	272
765e526c L	273	/* Parameters describing PLT generation, lazy or non-lazy. */
	274	struct elf_x86_plt_layout plt;
	275
	276	/* Parameters describing lazy PLT generation. */
	277	const struct elf_x86_lazy_plt_layout *lazy_plt;
	278
	279	/* Parameters describing non-lazy PLT generation. */
	280	const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
	281
0afcef53 L	282	union
	283	{
	284	bfd_signed_vma refcount;
	285	bfd_vma offset;
	286	} tls_ld_or_ldm_got;
	287
	288	/* The amount of space used by the jump slots in the GOT. */
	289	bfd_vma sgotplt_jump_table_size;
	290
	291	/* Small local sym cache. */
	292	struct sym_cache sym_cache;
	293
	294	/* _TLS_MODULE_BASE_ symbol. */
	295	struct bfd_link_hash_entry *tls_module_base;
	296
	297	/* Used by local STT_GNU_IFUNC symbols. */
	298	htab_t loc_hash_table;
	299	void * loc_hash_memory;
	300
0afcef53 L	301	/* The offset into sgot of the GOT entry used by the PLT entry
	302	above. */
	303	bfd_vma tlsdesc_got;
	304
	305	/* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
	306	bfd_vma next_jump_slot_index;
	307	/* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
	308	bfd_vma next_irelative_index;
	309
	310	/* TRUE if there are dynamic relocs against IFUNC symbols that apply
	311	to read-only sections. */
	312	bfd_boolean readonly_dynrelocs_against_ifunc;
	313
2926eb2c L	314	/* TRUE if this is a VxWorks x86 target. This is only used for
2926eb2c L	315	i386. */
eeb2f20a L	316	bfd_boolean is_vxworks;
eeb2f20a L	317
765e526c L	318	/* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
	319	This is used for i386 only. */
	320	asection *srelplt2;
	321
	322	/* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This
2926eb2c	323	is only used for i386. */
765e526c L	324	bfd_vma next_tls_desc_index;
765e526c L	325
2926eb2c L	326	/* The offset into splt of the PLT entry for the TLS descriptor
	327	resolver. Special values are 0, if not necessary (or not found
	328	to be necessary yet), and -1 if needed but not determined
	329	yet. This is only used for x86-64. */
	330	bfd_vma tlsdesc_plt;
	331
0afcef53 L	332	bfd_vma (*r_info) (bfd_vma, bfd_vma);
0afcef53 L	333	bfd_vma (*r_sym) (bfd_vma);
5e2ac45d	334	bfd_boolean (is_reloc_section) (const char );
fe53b4a4	335	enum elf_target_id target_id;
503294e7	336	unsigned int sizeof_reloc;
5e2ac45d L	337	unsigned int dt_reloc;
	338	unsigned int dt_reloc_sz;
	339	unsigned int dt_reloc_ent;
9ff114ca	340	unsigned int got_entry_size;
0afcef53 L	341	unsigned int pointer_r_type;
	342	int dynamic_interpreter_size;
	343	const char *dynamic_interpreter;
	344	const char *tls_get_addr;
	345	};
	346
1de031c8	347	struct elf_x86_init_table
a6798bab L	348	{
	349	/* The lazy PLT layout. */
	350	const struct elf_x86_lazy_plt_layout *lazy_plt;
	351
	352	/* The non-lazy PLT layout. */
	353	const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
	354
	355	/* The lazy PLT layout for IBT. */
	356	const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
	357
	358	/* The non-lazy PLT layout for IBT. */
	359	const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
	360
c6295c22	361	/* TRUE if this is a normal x86 target. */
a6798bab L	362	bfd_boolean normal_target;
	363
	364	/* TRUE if this is a VxWorks x86 target. */
	365	bfd_boolean is_vxworks;
7a382c1c L	366
	367	bfd_vma (*r_info) (bfd_vma, bfd_vma);
	368	bfd_vma (*r_sym) (bfd_vma);
a6798bab L	369	};
a6798bab L	370
0afcef53 L	371	struct elf_x86_obj_tdata
	372	{
	373	struct elf_obj_tdata root;
	374
	375	/* tls_type for each local got entry. */
	376	char *local_got_tls_type;
	377
	378	/* GOTPLT entries for TLS descriptors. */
	379	bfd_vma *local_tlsdesc_gotent;
	380	};
	381
f493882d L	382	enum elf_x86_plt_type
	383	{
	384	plt_non_lazy = 0,
	385	plt_lazy = 1 << 0,
	386	plt_pic = 1 << 1,
	387	plt_second = 1 << 2,
	388	plt_unknown = -1
	389	};
	390
	391	struct elf_x86_plt
	392	{
	393	const char *name;
	394	asection *sec;
	395	bfd_byte *contents;
	396	enum elf_x86_plt_type type;
	397	unsigned int plt_got_offset;
	398	unsigned int plt_entry_size;
	399	unsigned int plt_got_insn_size; /* Only used for x86-64. */
	400	long count;
	401	};
	402
0afcef53 L	403	#define elf_x86_tdata(abfd) \
	404	((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
	405
	406	#define elf_x86_local_got_tls_type(abfd) \
	407	(elf_x86_tdata (abfd)->local_got_tls_type)
	408
	409	#define elf_x86_local_tlsdesc_gotent(abfd) \
	410	(elf_x86_tdata (abfd)->local_tlsdesc_gotent)
	411
9ff114ca L	412	#define elf_x86_compute_jump_table_size(htab) \
	413	((htab)->elf.srelplt->reloc_count * (htab)->got_entry_size)
	414
fe53b4a4 L	415	#define is_x86_elf(bfd, htab) \
	416	(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
	417	&& elf_tdata (bfd) != NULL \
	418	&& elf_object_id (bfd) == (htab)->target_id)
	419
39946cc2 L	420	extern bfd_boolean _bfd_x86_elf_mkobject
	421	(bfd *);
	422
0afcef53 L	423	extern void _bfd_x86_elf_set_tls_module_base
	424	(struct bfd_link_info *);
	425
	426	extern bfd_vma _bfd_x86_elf_dtpoff_base
	427	(struct bfd_link_info *);
	428
	429	extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
	430	(struct elf_link_hash_entry , void );
	431
	432	extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
	433	(struct elf_x86_link_hash_table , bfd , const Elf_Internal_Rela *,
	434	bfd_boolean);
	435
	436	extern hashval_t _bfd_x86_elf_local_htab_hash
	437	(const void *);
	438
	439	extern int _bfd_x86_elf_local_htab_eq
	440	(const void , const void );
	441
	442	extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
	443	(struct bfd_hash_entry , struct bfd_hash_table , const char *);
	444
765e526c	445	extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
0afcef53 L	446	(bfd *);
	447
	448	extern int _bfd_x86_elf_compare_relocs
	449	(const void , const void );
	450
	451	extern bfd_boolean _bfd_x86_elf_link_check_relocs
	452	(bfd , struct bfd_link_info );
	453
5e2ac45d L	454	extern bfd_boolean _bfd_x86_elf_size_dynamic_sections
	455	(bfd , struct bfd_link_info );
	456
0afcef53 L	457	extern bfd_boolean _bfd_x86_elf_always_size_sections
	458	(bfd , struct bfd_link_info );
	459
	460	extern void _bfd_x86_elf_merge_symbol_attribute
	461	(struct elf_link_hash_entry , const Elf_Internal_Sym ,
	462	bfd_boolean, bfd_boolean);
	463
	464	extern void _bfd_x86_elf_copy_indirect_symbol
	465	(struct bfd_link_info , struct elf_link_hash_entry ,
	466	struct elf_link_hash_entry *);
	467
	468	extern bfd_boolean _bfd_x86_elf_fixup_symbol
	469	(struct bfd_link_info , struct elf_link_hash_entry );
	470
	471	extern bfd_boolean _bfd_x86_elf_hash_symbol
	472	(struct elf_link_hash_entry *);
	473
eeb2f20a L	474	extern bfd_boolean _bfd_x86_elf_adjust_dynamic_symbol
	475	(struct bfd_link_info , struct elf_link_hash_entry );
	476
6999821f L	477	extern bfd_boolean _bfd_x86_elf_link_symbol_references_local
	478	(struct bfd_link_info , struct elf_link_hash_entry );
	479
4f501a24 L	480	extern asection * _bfd_x86_elf_gc_mark_hook
	481	(asection , struct bfd_link_info , Elf_Internal_Rela *,
	482	struct elf_link_hash_entry , Elf_Internal_Sym );
	483
f493882d L	484	extern long _bfd_x86_elf_get_synthetic_symtab
	485	(bfd , long, long, bfd_vma, struct elf_x86_plt [], asymbol *,
	486	asymbol **);
	487
0afcef53 L	488	extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
	489	(bfd , unsigned int, bfd_byte , unsigned int);
	490
	491	extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
	492	(struct bfd_link_info , bfd , elf_property , elf_property );
	493
a6798bab	494	extern bfd * _bfd_x86_elf_link_setup_gnu_properties
1de031c8	495	(struct bfd_link_info , struct elf_x86_init_table );
a6798bab	496
39946cc2 L	497	#define bfd_elf64_mkobject \
	498	_bfd_x86_elf_mkobject
	499	#define bfd_elf32_mkobject \
	500	_bfd_x86_elf_mkobject
765e526c L	501	#define bfd_elf64_bfd_link_hash_table_create \
	502	_bfd_x86_elf_link_hash_table_create
	503	#define bfd_elf32_bfd_link_hash_table_create \
	504	_bfd_x86_elf_link_hash_table_create
0afcef53 L	505	#define bfd_elf64_bfd_link_check_relocs \
	506	_bfd_x86_elf_link_check_relocs
	507	#define bfd_elf32_bfd_link_check_relocs \
	508	_bfd_x86_elf_link_check_relocs
	509
5e2ac45d L	510	#define elf_backend_size_dynamic_sections \
5e2ac45d L	511	_bfd_x86_elf_size_dynamic_sections
0afcef53 L	512	#define elf_backend_always_size_sections \
	513	_bfd_x86_elf_always_size_sections
	514	#define elf_backend_merge_symbol_attribute \
	515	_bfd_x86_elf_merge_symbol_attribute
	516	#define elf_backend_copy_indirect_symbol \
	517	_bfd_x86_elf_copy_indirect_symbol
	518	#define elf_backend_fixup_symbol \
	519	_bfd_x86_elf_fixup_symbol
	520	#define elf_backend_hash_symbol \
	521	_bfd_x86_elf_hash_symbol
eeb2f20a L	522	#define elf_backend_adjust_dynamic_symbol \
eeb2f20a L	523	_bfd_x86_elf_adjust_dynamic_symbol
4f501a24 L	524	#define elf_backend_gc_mark_hook \
4f501a24 L	525	_bfd_x86_elf_gc_mark_hook
0afcef53 L	526	#define elf_backend_omit_section_dynsym \
	527	((bfd_boolean () (bfd , struct bfd_link_info , asection )) bfd_true)
	528	#define elf_backend_parse_gnu_properties \
	529	_bfd_x86_elf_parse_gnu_properties
	530	#define elf_backend_merge_gnu_properties \
	531	_bfd_x86_elf_merge_gnu_properties