[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 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) \
  (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
    ? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)

/* 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, ID, GOT_RELOC, EH) \
  ((EH)->elf.root.type == bfd_link_hash_undefweak		 \
   && ((EH)->elf.forced_local					 \
       || (bfd_link_executable (INFO)				 \
	   && (elf_x86_hash_table ((INFO), (ID))->interp == NULL \
	       || !(GOT_RELOC)					 \
	       || (EH)->has_non_got_reloc			 \
	       || !(INFO)->dynamic_undefined_weak))))

/* 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;

  /* 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.  This is used for i386 only.  */
  const bfd_byte *pic_plt0_entry;

  /* Subsequent entries in a PIC lazy procedure linkage table look
     like this.  This is used for i386 only.  */
  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.
     This is used for i386 only.  */
  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;
};

/* The first 3 values in tls_type of x86 ELF linker hash entry.  */
#define GOT_UNKNOWN	0
#define GOT_NORMAL	1
#define GOT_TLS_GD	2

#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 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.  */
  bfd_vma tlsdesc_plt;

  /* 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;

  /* 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 used for i386 only.  */
  bfd_vma next_tls_desc_index;

  bfd_vma (*r_info) (bfd_vma, bfd_vma);
  bfd_vma (*r_sym) (bfd_vma);
  unsigned int pointer_r_type;
  int dynamic_interpreter_size;
  const char *dynamic_interpreter;
  const char *tls_get_addr;
};

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)

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_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 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 *);

#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_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_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
765e526c L	29	#define ABI_64_P(abfd) \
	30	(get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
	31
0afcef53 L	32	/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
	33	copying dynamic variables from a shared lib into an app's dynbss
	34	section, and instead use a dynamic relocation to point into the
	35	shared lib. */
	36	#define ELIMINATE_COPY_RELOCS 1
	37
	38	#define elf_x86_hash_table(p, id) \
	39	(elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) == (id) \
	40	? ((struct elf_x86_link_hash_table *) ((p)->hash)) : NULL)
	41
	42	/* Is a undefined weak symbol which is resolved to 0. Reference to an
	43	undefined weak symbol is resolved to 0 when building executable if
	44	it isn't dynamic and
	45	1. Has non-GOT/non-PLT relocations in text section. Or
	46	2. Has no GOT/PLT relocation.
	47	Local undefined weak symbol is always resolved to 0.
	48	*/
	49	#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, ID, GOT_RELOC, EH) \
	50	((EH)->elf.root.type == bfd_link_hash_undefweak \
	51	&& ((EH)->elf.forced_local \
	52	\|\| (bfd_link_executable (INFO) \
	53	&& (elf_x86_hash_table ((INFO), (ID))->interp == NULL \
	54	\|\| !(GOT_RELOC) \
	55	\|\| (EH)->has_non_got_reloc \
	56	\|\| !(INFO)->dynamic_undefined_weak))))
	57
	58	/* Should copy relocation be generated for a symbol. Don't generate
	59	copy relocation against a protected symbol defined in a shared
	60	object with GNU_PROPERTY_NO_COPY_ON_PROTECTED. */
	61	#define SYMBOL_NO_COPYRELOC(INFO, EH) \
	62	((EH)->def_protected \
	63	&& ((EH)->elf.root.type == bfd_link_hash_defined \
	64	\|\| (EH)->elf.root.type == bfd_link_hash_defweak) \
	65	&& elf_has_no_copy_on_protected ((EH)->elf.root.u.def.section->owner) \
	66	&& ((EH)->elf.root.u.def.section->owner->flags & DYNAMIC) != 0 \
	67	&& ((EH)->elf.root.u.def.section->flags & SEC_CODE) == 0)
	68
	69	/* x86 ELF linker hash entry. */
	70
	71	struct elf_x86_link_hash_entry
	72	{
	73	struct elf_link_hash_entry elf;
	74
	75	/* Track dynamic relocs copied for this symbol. */
	76	struct elf_dyn_relocs *dyn_relocs;
	77
	78	unsigned char tls_type;
	79
	80	/* TRUE if symbol has GOT or PLT relocations. */
	81	unsigned int has_got_reloc : 1;
	82
	83	/* TRUE if symbol has non-GOT/non-PLT relocations in text sections. */
	84	unsigned int has_non_got_reloc : 1;
	85
	86	/* Don't call finish_dynamic_symbol on this symbol. */
	87	unsigned int no_finish_dynamic_symbol : 1;
	88
	89	/* TRUE if symbol is __tls_get_addr. */
	90	unsigned int tls_get_addr : 1;
	91
	92	/* TRUE if symbol is defined as a protected symbol. */
	93	unsigned int def_protected : 1;
	94
	95	/* Symbol is referenced by R_386_GOTOFF relocation. This is only used
96	by i386. */
97	unsigned int gotoff_ref : 1;
98
99	/* TRUE if a weak symbol with a real definition needs a copy reloc.
100	When there is a weak symbol with a real definition, the processor
101	independent code will have arranged for us to see the real
102	definition first. We need to copy the needs_copy bit from the
103	real definition and check it when allowing copy reloc in PIE. This
104	is only used by x86-64. */
105	unsigned int needs_copy : 1;
106
107	/* Reference count of C/C++ function pointer relocations in read-write
108	section which can be resolved at run-time. */
109	bfd_signed_vma func_pointer_refcount;
110
111	/* Information about the GOT PLT entry. Filled when there are both
112	GOT and PLT relocations against the same function. */
113	union gotplt_union plt_got;
114
115	/* Information about the second PLT entry. */
116	union gotplt_union plt_second;
117
118	/* Offset of the GOTPLT entry reserved for the TLS descriptor,
119	starting at the end of the jump table. */
120	bfd_vma tlsdesc_got;
121	};
122
765e526c L	123	struct elf_x86_lazy_plt_layout
	124	{
	125	/* The first entry in an absolute lazy procedure linkage table looks
	126	like this. */
	127	const bfd_byte *plt0_entry;
	128	unsigned int plt0_entry_size; /* Size of PLT0 entry. */
	129
	130	/* Later entries in an absolute lazy procedure linkage table look
	131	like this. */
	132	const bfd_byte *plt_entry;
	133	unsigned int plt_entry_size; /* Size of each PLT entry. */
	134
	135	/* Offsets into plt0_entry that are to be replaced with GOT[1] and
	136	GOT[2]. */
	137	unsigned int plt0_got1_offset;
	138	unsigned int plt0_got2_offset;
	139
	140	/* Offset of the end of the PC-relative instruction containing
	141	plt0_got2_offset. This is for x86-64 only. */
	142	unsigned int plt0_got2_insn_end;
	143
	144	/* Offsets into plt_entry that are to be replaced with... */
	145	unsigned int plt_got_offset; /* ... address of this symbol in .got. */
	146	unsigned int plt_reloc_offset; /* ... offset into relocation table. */
	147	unsigned int plt_plt_offset; /* ... offset to start of .plt. */
	148
	149	/* Length of the PC-relative instruction containing plt_got_offset.
	150	This is used for x86-64 only. */
	151	unsigned int plt_got_insn_size;
	152
	153	/* Offset of the end of the PC-relative jump to plt0_entry. This is
	154	used for x86-64 only. */
	155	unsigned int plt_plt_insn_end;
	156
	157	/* Offset into plt_entry where the initial value of the GOT entry
	158	points. */
	159	unsigned int plt_lazy_offset;
	160
	161	/* The first entry in a PIC lazy procedure linkage table looks like
	162	this. This is used for i386 only. */
	163	const bfd_byte *pic_plt0_entry;
	164
	165	/* Subsequent entries in a PIC lazy procedure linkage table look
	166	like this. This is used for i386 only. */
	167	const bfd_byte *pic_plt_entry;
	168
	169	/* .eh_frame covering the lazy .plt section. */
	170	const bfd_byte *eh_frame_plt;
	171	unsigned int eh_frame_plt_size;
	172	};
	173
	174	struct elf_x86_non_lazy_plt_layout
	175	{
	176	/* Entries in an absolute non-lazy procedure linkage table look like
	177	this. */
	178	const bfd_byte *plt_entry;
	179	/* Entries in a PIC non-lazy procedure linkage table look like this.
	180	This is used for i386 only. */
	181	const bfd_byte *pic_plt_entry;
	182
	183	unsigned int plt_entry_size; /* Size of each PLT entry. */
	184
	185	/* Offsets into plt_entry that are to be replaced with... */
	186	unsigned int plt_got_offset; /* ... address of this symbol in .got. */
187
188	/* Length of the PC-relative instruction containing plt_got_offset.
189	This is used for x86-64 only. */
190	unsigned int plt_got_insn_size;
191
192	/* .eh_frame covering the non-lazy .plt section. */
193	const bfd_byte *eh_frame_plt;
194	unsigned int eh_frame_plt_size;
195	};
196
197	struct elf_x86_plt_layout
198	{
199	/* The first entry in a lazy procedure linkage table looks like this.
200	This is only used for i386 where absolute PLT0 and PIC PLT0 are
201	different. */
202	const bfd_byte *plt0_entry;
203	/* Entries in a procedure linkage table look like this. */
204	const bfd_byte *plt_entry;
205	unsigned int plt_entry_size; /* Size of each PLT entry. */
206
207	/* 1 has PLT0. */
208	unsigned int has_plt0;
209
210	/* Offsets into plt_entry that are to be replaced with... */
211	unsigned int plt_got_offset; /* ... address of this symbol in .got. */
212
213	/* Length of the PC-relative instruction containing plt_got_offset.
214	This is only used for x86-64. */
215	unsigned int plt_got_insn_size;
216
217	/* .eh_frame covering the .plt section. */
218	const bfd_byte *eh_frame_plt;
219	unsigned int eh_frame_plt_size;
220	};
221
0afcef53 L	222	/* The first 3 values in tls_type of x86 ELF linker hash entry. */
	223	#define GOT_UNKNOWN 0
	224	#define GOT_NORMAL 1
	225	#define GOT_TLS_GD 2
	226
	227	#define elf_x86_hash_entry(ent) \
	228	((struct elf_x86_link_hash_entry *)(ent))
	229
	230	/* x86 ELF linker hash table. */
	231
	232	struct elf_x86_link_hash_table
	233	{
	234	struct elf_link_hash_table elf;
	235
	236	/* Short-cuts to get to dynamic linker sections. */
	237	asection *interp;
	238	asection *plt_eh_frame;
	239	asection *plt_second;
	240	asection *plt_second_eh_frame;
	241	asection *plt_got;
	242	asection *plt_got_eh_frame;
	243
765e526c L	244	/* Parameters describing PLT generation, lazy or non-lazy. */
	245	struct elf_x86_plt_layout plt;
	246
	247	/* Parameters describing lazy PLT generation. */
	248	const struct elf_x86_lazy_plt_layout *lazy_plt;
	249
	250	/* Parameters describing non-lazy PLT generation. */
	251	const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
	252
0afcef53 L	253	union
	254	{
	255	bfd_signed_vma refcount;
	256	bfd_vma offset;
	257	} tls_ld_or_ldm_got;
	258
	259	/* The amount of space used by the jump slots in the GOT. */
	260	bfd_vma sgotplt_jump_table_size;
	261
	262	/* Small local sym cache. */
	263	struct sym_cache sym_cache;
	264
	265	/* _TLS_MODULE_BASE_ symbol. */
	266	struct bfd_link_hash_entry *tls_module_base;
	267
	268	/* Used by local STT_GNU_IFUNC symbols. */
	269	htab_t loc_hash_table;
	270	void * loc_hash_memory;
	271
	272	/* The offset into splt of the PLT entry for the TLS descriptor
	273	resolver. Special values are 0, if not necessary (or not found
	274	to be necessary yet), and -1 if needed but not determined
	275	yet. */
	276	bfd_vma tlsdesc_plt;
	277
	278	/* The offset into sgot of the GOT entry used by the PLT entry
	279	above. */
	280	bfd_vma tlsdesc_got;
	281
	282	/* The index of the next R_X86_64_JUMP_SLOT entry in .rela.plt. */
	283	bfd_vma next_jump_slot_index;
	284	/* The index of the next R_X86_64_IRELATIVE entry in .rela.plt. */
	285	bfd_vma next_irelative_index;
	286
	287	/* TRUE if there are dynamic relocs against IFUNC symbols that apply
	288	to read-only sections. */
	289	bfd_boolean readonly_dynrelocs_against_ifunc;
	290
765e526c L	291	/* The (unloaded but important) .rel.plt.unloaded section on VxWorks.
	292	This is used for i386 only. */
	293	asection *srelplt2;
	294
	295	/* The index of the next unused R_386_TLS_DESC slot in .rel.plt. This
	296	is used for i386 only. */
	297	bfd_vma next_tls_desc_index;
	298
0afcef53 L	299	bfd_vma (*r_info) (bfd_vma, bfd_vma);
	300	bfd_vma (*r_sym) (bfd_vma);
	301	unsigned int pointer_r_type;
	302	int dynamic_interpreter_size;
	303	const char *dynamic_interpreter;
	304	const char *tls_get_addr;
	305	};
	306
	307	struct elf_x86_obj_tdata
	308	{
	309	struct elf_obj_tdata root;
	310
	311	/* tls_type for each local got entry. */
	312	char *local_got_tls_type;
	313
	314	/* GOTPLT entries for TLS descriptors. */
	315	bfd_vma *local_tlsdesc_gotent;
	316	};
	317
f493882d L	318	enum elf_x86_plt_type
	319	{
	320	plt_non_lazy = 0,
	321	plt_lazy = 1 << 0,
	322	plt_pic = 1 << 1,
	323	plt_second = 1 << 2,
	324	plt_unknown = -1
	325	};
	326
	327	struct elf_x86_plt
	328	{
	329	const char *name;
	330	asection *sec;
	331	bfd_byte *contents;
	332	enum elf_x86_plt_type type;
	333	unsigned int plt_got_offset;
	334	unsigned int plt_entry_size;
	335	unsigned int plt_got_insn_size; /* Only used for x86-64. */
	336	long count;
	337	};
	338
0afcef53 L	339	#define elf_x86_tdata(abfd) \
	340	((struct elf_x86_obj_tdata *) (abfd)->tdata.any)
	341
	342	#define elf_x86_local_got_tls_type(abfd) \
	343	(elf_x86_tdata (abfd)->local_got_tls_type)
	344
	345	#define elf_x86_local_tlsdesc_gotent(abfd) \
	346	(elf_x86_tdata (abfd)->local_tlsdesc_gotent)
	347
	348	extern void _bfd_x86_elf_set_tls_module_base
	349	(struct bfd_link_info *);
	350
	351	extern bfd_vma _bfd_x86_elf_dtpoff_base
	352	(struct bfd_link_info *);
	353
	354	extern bfd_boolean _bfd_x86_elf_readonly_dynrelocs
	355	(struct elf_link_hash_entry , void );
	356
	357	extern struct elf_link_hash_entry * _bfd_elf_x86_get_local_sym_hash
	358	(struct elf_x86_link_hash_table , bfd , const Elf_Internal_Rela *,
	359	bfd_boolean);
	360
	361	extern hashval_t _bfd_x86_elf_local_htab_hash
	362	(const void *);
	363
	364	extern int _bfd_x86_elf_local_htab_eq
	365	(const void , const void );
	366
	367	extern struct bfd_hash_entry * _bfd_x86_elf_link_hash_newfunc
	368	(struct bfd_hash_entry , struct bfd_hash_table , const char *);
	369
765e526c	370	extern struct bfd_link_hash_table * _bfd_x86_elf_link_hash_table_create
0afcef53 L	371	(bfd *);
	372
	373	extern int _bfd_x86_elf_compare_relocs
	374	(const void , const void );
	375
	376	extern bfd_boolean _bfd_x86_elf_link_check_relocs
	377	(bfd , struct bfd_link_info );
	378
	379	extern bfd_boolean _bfd_x86_elf_always_size_sections
	380	(bfd , struct bfd_link_info );
	381
	382	extern void _bfd_x86_elf_merge_symbol_attribute
	383	(struct elf_link_hash_entry , const Elf_Internal_Sym ,
	384	bfd_boolean, bfd_boolean);
	385
	386	extern void _bfd_x86_elf_copy_indirect_symbol
	387	(struct bfd_link_info , struct elf_link_hash_entry ,
	388	struct elf_link_hash_entry *);
	389
	390	extern bfd_boolean _bfd_x86_elf_fixup_symbol
	391	(struct bfd_link_info , struct elf_link_hash_entry );
	392
	393	extern bfd_boolean _bfd_x86_elf_hash_symbol
	394	(struct elf_link_hash_entry *);
	395
f493882d L	396	extern long _bfd_x86_elf_get_synthetic_symtab
	397	(bfd , long, long, bfd_vma, struct elf_x86_plt [], asymbol *,
	398	asymbol **);
	399
0afcef53 L	400	extern enum elf_property_kind _bfd_x86_elf_parse_gnu_properties
	401	(bfd , unsigned int, bfd_byte , unsigned int);
	402
	403	extern bfd_boolean _bfd_x86_elf_merge_gnu_properties
	404	(struct bfd_link_info , bfd , elf_property , elf_property );
	405
765e526c L	406	#define bfd_elf64_bfd_link_hash_table_create \
	407	_bfd_x86_elf_link_hash_table_create
	408	#define bfd_elf32_bfd_link_hash_table_create \
	409	_bfd_x86_elf_link_hash_table_create
0afcef53 L	410	#define bfd_elf64_bfd_link_check_relocs \
	411	_bfd_x86_elf_link_check_relocs
	412	#define bfd_elf32_bfd_link_check_relocs \
	413	_bfd_x86_elf_link_check_relocs
	414
	415	#define elf_backend_always_size_sections \
	416	_bfd_x86_elf_always_size_sections
	417	#define elf_backend_merge_symbol_attribute \
	418	_bfd_x86_elf_merge_symbol_attribute
	419	#define elf_backend_copy_indirect_symbol \
	420	_bfd_x86_elf_copy_indirect_symbol
	421	#define elf_backend_fixup_symbol \
	422	_bfd_x86_elf_fixup_symbol
	423	#define elf_backend_hash_symbol \
	424	_bfd_x86_elf_hash_symbol
	425	#define elf_backend_omit_section_dynsym \
	426	((bfd_boolean () (bfd , struct bfd_link_info , asection )) bfd_true)
	427	#define elf_backend_parse_gnu_properties \
	428	_bfd_x86_elf_parse_gnu_properties
	429	#define elf_backend_merge_gnu_properties \
	430	_bfd_x86_elf_merge_gnu_properties