blob: f9202085b38968cdada56b190a210ebcfd3b409f [file] [log] [blame]
/* X86-64 specific support for ELF
Copyright (C) 2000-2016 Free Software Foundation, Inc.
Contributed by Jan Hubicka <jh@suse.cz>.
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 "elf-nacl.h"
#include "bfd_stdint.h"
#include "objalloc.h"
#include "hashtab.h"
#include "dwarf2.h"
#include "libiberty.h"
#include "opcode/i386.h"
#include "elf/x86-64.h"
#ifdef CORE_HEADER
#include <stdarg.h>
#include CORE_HEADER
#endif
/* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
#define MINUS_ONE (~ (bfd_vma) 0)
/* Since both 32-bit and 64-bit x86-64 encode relocation type in the
identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
since they are the same. */
#define ABI_64_P(abfd) \
(get_elf_backend_data (abfd)->s->elfclass == ELFCLASS64)
/* The relocation "howto" table. Order of fields:
type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
static reloc_howto_type x86_64_elf_howto_table[] =
{
HOWTO(R_X86_64_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
bfd_elf_generic_reloc, "R_X86_64_NONE", FALSE, 0x00000000, 0x00000000,
FALSE),
HOWTO(R_X86_64_64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_64", FALSE, MINUS_ONE, MINUS_ONE,
FALSE),
HOWTO(R_X86_64_PC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_PC32", FALSE, 0xffffffff, 0xffffffff,
TRUE),
HOWTO(R_X86_64_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOT32", FALSE, 0xffffffff, 0xffffffff,
FALSE),
HOWTO(R_X86_64_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_PLT32", FALSE, 0xffffffff, 0xffffffff,
TRUE),
HOWTO(R_X86_64_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_COPY", FALSE, 0xffffffff, 0xffffffff,
FALSE),
HOWTO(R_X86_64_GLOB_DAT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_GLOB_DAT", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_JUMP_SLOT, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_JUMP_SLOT", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_RELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_RELATIVE", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_GOTPCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOTPCREL", FALSE, 0xffffffff,
0xffffffff, TRUE),
HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
FALSE),
HOWTO(R_X86_64_32S, 0, 2, 32, FALSE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_32S", FALSE, 0xffffffff, 0xffffffff,
FALSE),
HOWTO(R_X86_64_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_16", FALSE, 0xffff, 0xffff, FALSE),
HOWTO(R_X86_64_PC16,0, 1, 16, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_PC16", FALSE, 0xffff, 0xffff, TRUE),
HOWTO(R_X86_64_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_8", FALSE, 0xff, 0xff, FALSE),
HOWTO(R_X86_64_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_PC8", FALSE, 0xff, 0xff, TRUE),
HOWTO(R_X86_64_DTPMOD64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_DTPMOD64", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_DTPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_DTPOFF64", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_TPOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_TPOFF64", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_TLSGD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_TLSGD", FALSE, 0xffffffff,
0xffffffff, TRUE),
HOWTO(R_X86_64_TLSLD, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_TLSLD", FALSE, 0xffffffff,
0xffffffff, TRUE),
HOWTO(R_X86_64_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_DTPOFF32", FALSE, 0xffffffff,
0xffffffff, FALSE),
HOWTO(R_X86_64_GOTTPOFF, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOTTPOFF", FALSE, 0xffffffff,
0xffffffff, TRUE),
HOWTO(R_X86_64_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_TPOFF32", FALSE, 0xffffffff,
0xffffffff, FALSE),
HOWTO(R_X86_64_PC64, 0, 4, 64, TRUE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_PC64", FALSE, MINUS_ONE, MINUS_ONE,
TRUE),
HOWTO(R_X86_64_GOTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_GOTOFF64",
FALSE, MINUS_ONE, MINUS_ONE, FALSE),
HOWTO(R_X86_64_GOTPC32, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOTPC32",
FALSE, 0xffffffff, 0xffffffff, TRUE),
HOWTO(R_X86_64_GOT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOT64", FALSE, MINUS_ONE, MINUS_ONE,
FALSE),
HOWTO(R_X86_64_GOTPCREL64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOTPCREL64", FALSE, MINUS_ONE,
MINUS_ONE, TRUE),
HOWTO(R_X86_64_GOTPC64, 0, 4, 64, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOTPC64",
FALSE, MINUS_ONE, MINUS_ONE, TRUE),
HOWTO(R_X86_64_GOTPLT64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOTPLT64", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_PLTOFF64, 0, 4, 64, FALSE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_PLTOFF64", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
bfd_elf_generic_reloc, "R_X86_64_SIZE32", FALSE, 0xffffffff, 0xffffffff,
FALSE),
HOWTO(R_X86_64_SIZE64, 0, 4, 64, FALSE, 0, complain_overflow_unsigned,
bfd_elf_generic_reloc, "R_X86_64_SIZE64", FALSE, MINUS_ONE, MINUS_ONE,
FALSE),
HOWTO(R_X86_64_GOTPC32_TLSDESC, 0, 2, 32, TRUE, 0,
complain_overflow_bitfield, bfd_elf_generic_reloc,
"R_X86_64_GOTPC32_TLSDESC",
FALSE, 0xffffffff, 0xffffffff, TRUE),
HOWTO(R_X86_64_TLSDESC_CALL, 0, 0, 0, FALSE, 0,
complain_overflow_dont, bfd_elf_generic_reloc,
"R_X86_64_TLSDESC_CALL",
FALSE, 0, 0, FALSE),
HOWTO(R_X86_64_TLSDESC, 0, 4, 64, FALSE, 0,
complain_overflow_bitfield, bfd_elf_generic_reloc,
"R_X86_64_TLSDESC",
FALSE, MINUS_ONE, MINUS_ONE, FALSE),
HOWTO(R_X86_64_IRELATIVE, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_IRELATIVE", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_RELATIVE64, 0, 4, 64, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_RELATIVE64", FALSE, MINUS_ONE,
MINUS_ONE, FALSE),
HOWTO(R_X86_64_PC32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_PC32_BND", FALSE, 0xffffffff, 0xffffffff,
TRUE),
HOWTO(R_X86_64_PLT32_BND, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_PLT32_BND", FALSE, 0xffffffff, 0xffffffff,
TRUE),
HOWTO(R_X86_64_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_GOTPCRELX", FALSE, 0xffffffff,
0xffffffff, TRUE),
HOWTO(R_X86_64_REX_GOTPCRELX, 0, 2, 32, TRUE, 0, complain_overflow_signed,
bfd_elf_generic_reloc, "R_X86_64_REX_GOTPCRELX", FALSE, 0xffffffff,
0xffffffff, TRUE),
/* We have a gap in the reloc numbers here.
R_X86_64_standard counts the number up to this point, and
R_X86_64_vt_offset is the value to subtract from a reloc type of
R_X86_64_GNU_VT* to form an index into this table. */
#define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
#define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
/* GNU extension to record C++ vtable hierarchy. */
HOWTO (R_X86_64_GNU_VTINHERIT, 0, 4, 0, FALSE, 0, complain_overflow_dont,
NULL, "R_X86_64_GNU_VTINHERIT", FALSE, 0, 0, FALSE),
/* GNU extension to record C++ vtable member usage. */
HOWTO (R_X86_64_GNU_VTENTRY, 0, 4, 0, FALSE, 0, complain_overflow_dont,
_bfd_elf_rel_vtable_reloc_fn, "R_X86_64_GNU_VTENTRY", FALSE, 0, 0,
FALSE),
/* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
HOWTO(R_X86_64_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
bfd_elf_generic_reloc, "R_X86_64_32", FALSE, 0xffffffff, 0xffffffff,
FALSE)
};
#define IS_X86_64_PCREL_TYPE(TYPE) \
( ((TYPE) == R_X86_64_PC8) \
|| ((TYPE) == R_X86_64_PC16) \
|| ((TYPE) == R_X86_64_PC32) \
|| ((TYPE) == R_X86_64_PC32_BND) \
|| ((TYPE) == R_X86_64_PC64))
/* Map BFD relocs to the x86_64 elf relocs. */
struct elf_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned char elf_reloc_val;
};
static const struct elf_reloc_map x86_64_reloc_map[] =
{
{ BFD_RELOC_NONE, R_X86_64_NONE, },
{ BFD_RELOC_64, R_X86_64_64, },
{ BFD_RELOC_32_PCREL, R_X86_64_PC32, },
{ BFD_RELOC_X86_64_GOT32, R_X86_64_GOT32,},
{ BFD_RELOC_X86_64_PLT32, R_X86_64_PLT32,},
{ BFD_RELOC_X86_64_COPY, R_X86_64_COPY, },
{ BFD_RELOC_X86_64_GLOB_DAT, R_X86_64_GLOB_DAT, },
{ BFD_RELOC_X86_64_JUMP_SLOT, R_X86_64_JUMP_SLOT, },
{ BFD_RELOC_X86_64_RELATIVE, R_X86_64_RELATIVE, },
{ BFD_RELOC_X86_64_GOTPCREL, R_X86_64_GOTPCREL, },
{ BFD_RELOC_32, R_X86_64_32, },
{ BFD_RELOC_X86_64_32S, R_X86_64_32S, },
{ BFD_RELOC_16, R_X86_64_16, },
{ BFD_RELOC_16_PCREL, R_X86_64_PC16, },
{ BFD_RELOC_8, R_X86_64_8, },
{ BFD_RELOC_8_PCREL, R_X86_64_PC8, },
{ BFD_RELOC_X86_64_DTPMOD64, R_X86_64_DTPMOD64, },
{ BFD_RELOC_X86_64_DTPOFF64, R_X86_64_DTPOFF64, },
{ BFD_RELOC_X86_64_TPOFF64, R_X86_64_TPOFF64, },
{ BFD_RELOC_X86_64_TLSGD, R_X86_64_TLSGD, },
{ BFD_RELOC_X86_64_TLSLD, R_X86_64_TLSLD, },
{ BFD_RELOC_X86_64_DTPOFF32, R_X86_64_DTPOFF32, },
{ BFD_RELOC_X86_64_GOTTPOFF, R_X86_64_GOTTPOFF, },
{ BFD_RELOC_X86_64_TPOFF32, R_X86_64_TPOFF32, },
{ BFD_RELOC_64_PCREL, R_X86_64_PC64, },
{ BFD_RELOC_X86_64_GOTOFF64, R_X86_64_GOTOFF64, },
{ BFD_RELOC_X86_64_GOTPC32, R_X86_64_GOTPC32, },
{ BFD_RELOC_X86_64_GOT64, R_X86_64_GOT64, },
{ BFD_RELOC_X86_64_GOTPCREL64,R_X86_64_GOTPCREL64, },
{ BFD_RELOC_X86_64_GOTPC64, R_X86_64_GOTPC64, },
{ BFD_RELOC_X86_64_GOTPLT64, R_X86_64_GOTPLT64, },
{ BFD_RELOC_X86_64_PLTOFF64, R_X86_64_PLTOFF64, },
{ BFD_RELOC_SIZE32, R_X86_64_SIZE32, },
{ BFD_RELOC_SIZE64, R_X86_64_SIZE64, },
{ BFD_RELOC_X86_64_GOTPC32_TLSDESC, R_X86_64_GOTPC32_TLSDESC, },
{ BFD_RELOC_X86_64_TLSDESC_CALL, R_X86_64_TLSDESC_CALL, },
{ BFD_RELOC_X86_64_TLSDESC, R_X86_64_TLSDESC, },
{ BFD_RELOC_X86_64_IRELATIVE, R_X86_64_IRELATIVE, },
{ BFD_RELOC_X86_64_PC32_BND, R_X86_64_PC32_BND, },
{ BFD_RELOC_X86_64_PLT32_BND, R_X86_64_PLT32_BND, },
{ BFD_RELOC_X86_64_GOTPCRELX, R_X86_64_GOTPCRELX, },
{ BFD_RELOC_X86_64_REX_GOTPCRELX, R_X86_64_REX_GOTPCRELX, },
{ BFD_RELOC_VTABLE_INHERIT, R_X86_64_GNU_VTINHERIT, },
{ BFD_RELOC_VTABLE_ENTRY, R_X86_64_GNU_VTENTRY, },
};
static reloc_howto_type *
elf_x86_64_rtype_to_howto (bfd *abfd, unsigned r_type)
{
unsigned i;
if (r_type == (unsigned int) R_X86_64_32)
{
if (ABI_64_P (abfd))
i = r_type;
else
i = ARRAY_SIZE (x86_64_elf_howto_table) - 1;
}
else if (r_type < (unsigned int) R_X86_64_GNU_VTINHERIT
|| r_type >= (unsigned int) R_X86_64_max)
{
if (r_type >= (unsigned int) R_X86_64_standard)
{
(*_bfd_error_handler) (_("%B: invalid relocation type %d"),
abfd, (int) r_type);
r_type = R_X86_64_NONE;
}
i = r_type;
}
else
i = r_type - (unsigned int) R_X86_64_vt_offset;
BFD_ASSERT (x86_64_elf_howto_table[i].type == r_type);
return &x86_64_elf_howto_table[i];
}
/* Given a BFD reloc type, return a HOWTO structure. */
static reloc_howto_type *
elf_x86_64_reloc_type_lookup (bfd *abfd,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < sizeof (x86_64_reloc_map) / sizeof (struct elf_reloc_map);
i++)
{
if (x86_64_reloc_map[i].bfd_reloc_val == code)
return elf_x86_64_rtype_to_howto (abfd,
x86_64_reloc_map[i].elf_reloc_val);
}
return NULL;
}
static reloc_howto_type *
elf_x86_64_reloc_name_lookup (bfd *abfd,
const char *r_name)
{
unsigned int i;
if (!ABI_64_P (abfd) && strcasecmp (r_name, "R_X86_64_32") == 0)
{
/* Get x32 R_X86_64_32. */
reloc_howto_type *reloc
= &x86_64_elf_howto_table[ARRAY_SIZE (x86_64_elf_howto_table) - 1];
BFD_ASSERT (reloc->type == (unsigned int) R_X86_64_32);
return reloc;
}
for (i = 0; i < ARRAY_SIZE (x86_64_elf_howto_table); i++)
if (x86_64_elf_howto_table[i].name != NULL
&& strcasecmp (x86_64_elf_howto_table[i].name, r_name) == 0)
return &x86_64_elf_howto_table[i];
return NULL;
}
/* Given an x86_64 ELF reloc type, fill in an arelent structure. */
static void
elf_x86_64_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned r_type;
r_type = ELF32_R_TYPE (dst->r_info);
cache_ptr->howto = elf_x86_64_rtype_to_howto (abfd, r_type);
BFD_ASSERT (r_type == cache_ptr->howto->type);
}
/* Support for core dump NOTE sections. */
static bfd_boolean
elf_x86_64_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
{
int offset;
size_t size;
switch (note->descsz)
{
default:
return FALSE;
case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
/* pr_cursig */
elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
/* pr_pid */
elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
/* pr_reg */
offset = 72;
size = 216;
break;
case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
/* pr_cursig */
elf_tdata (abfd)->core->signal
= bfd_get_16 (abfd, note->descdata + 12);
/* pr_pid */
elf_tdata (abfd)->core->lwpid
= bfd_get_32 (abfd, note->descdata + 32);
/* pr_reg */
offset = 112;
size = 216;
break;
}
/* Make a ".reg/999" section. */
return _bfd_elfcore_make_pseudosection (abfd, ".reg",
size, note->descpos + offset);
}
static bfd_boolean
elf_x86_64_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
{
switch (note->descsz)
{
default:
return FALSE;
case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
elf_tdata (abfd)->core->pid
= bfd_get_32 (abfd, note->descdata + 12);
elf_tdata (abfd)->core->program
= _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
elf_tdata (abfd)->core->command
= _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
break;
case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
elf_tdata (abfd)->core->pid
= bfd_get_32 (abfd, note->descdata + 24);
elf_tdata (abfd)->core->program
= _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
elf_tdata (abfd)->core->command
= _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
}
/* Note that for some reason, a spurious space is tacked
onto the end of the args in some (at least one anyway)
implementations, so strip it off if it exists. */
{
char *command = elf_tdata (abfd)->core->command;
int n = strlen (command);
if (0 < n && command[n - 1] == ' ')
command[n - 1] = '\0';
}
return TRUE;
}
#ifdef CORE_HEADER
static char *
elf_x86_64_write_core_note (bfd *abfd, char *buf, int *bufsiz,
int note_type, ...)
{
const struct elf_backend_data *bed = get_elf_backend_data (abfd);
va_list ap;
const char *fname, *psargs;
long pid;
int cursig;
const void *gregs;
switch (note_type)
{
default:
return NULL;
case NT_PRPSINFO:
va_start (ap, note_type);
fname = va_arg (ap, const char *);
psargs = va_arg (ap, const char *);
va_end (ap);
if (bed->s->elfclass == ELFCLASS32)
{
prpsinfo32_t data;
memset (&data, 0, sizeof (data));
strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
&data, sizeof (data));
}
else
{
prpsinfo64_t data;
memset (&data, 0, sizeof (data));
strncpy (data.pr_fname, fname, sizeof (data.pr_fname));
strncpy (data.pr_psargs, psargs, sizeof (data.pr_psargs));
return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
&data, sizeof (data));
}
/* NOTREACHED */
case NT_PRSTATUS:
va_start (ap, note_type);
pid = va_arg (ap, long);
cursig = va_arg (ap, int);
gregs = va_arg (ap, const void *);
va_end (ap);
if (bed->s->elfclass == ELFCLASS32)
{
if (bed->elf_machine_code == EM_X86_64)
{
prstatusx32_t prstat;
memset (&prstat, 0, sizeof (prstat));
prstat.pr_pid = pid;
prstat.pr_cursig = cursig;
memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
&prstat, sizeof (prstat));
}
else
{
prstatus32_t prstat;
memset (&prstat, 0, sizeof (prstat));
prstat.pr_pid = pid;
prstat.pr_cursig = cursig;
memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
&prstat, sizeof (prstat));
}
}
else
{
prstatus64_t prstat;
memset (&prstat, 0, sizeof (prstat));
prstat.pr_pid = pid;
prstat.pr_cursig = cursig;
memcpy (&prstat.pr_reg, gregs, sizeof (prstat.pr_reg));
return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
&prstat, sizeof (prstat));
}
}
/* NOTREACHED */
}
#endif
/* Functions for the x86-64 ELF linker. */
/* The name of the dynamic interpreter. This is put in the .interp
section. */
#define ELF64_DYNAMIC_INTERPRETER "/lib/ld64.so.1"
#define ELF32_DYNAMIC_INTERPRETER "/lib/ldx32.so.1"
/* 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
/* The size in bytes of an entry in the global offset table. */
#define GOT_ENTRY_SIZE 8
/* The size in bytes of an entry in the procedure linkage table. */
#define PLT_ENTRY_SIZE 16
/* The first entry in a procedure linkage table looks like this. See the
SVR4 ABI i386 supplement and the x86-64 ABI to see how this works. */
static const bfd_byte elf_x86_64_plt0_entry[PLT_ENTRY_SIZE] =
{
0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
};
/* Subsequent entries in a procedure linkage table look like this. */
static const bfd_byte elf_x86_64_plt_entry[PLT_ENTRY_SIZE] =
{
0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
0x68, /* pushq immediate */
0, 0, 0, 0, /* replaced with index into relocation table. */
0xe9, /* jmp relative */
0, 0, 0, 0 /* replaced with offset to start of .plt0. */
};
/* The first entry in a procedure linkage table with BND relocations
like this. */
static const bfd_byte elf_x86_64_bnd_plt0_entry[PLT_ENTRY_SIZE] =
{
0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
0x0f, 0x1f, 0 /* nopl (%rax) */
};
/* Subsequent entries for legacy branches in a procedure linkage table
with BND relocations look like this. */
static const bfd_byte elf_x86_64_legacy_plt_entry[PLT_ENTRY_SIZE] =
{
0x68, 0, 0, 0, 0, /* pushq immediate */
0xe9, 0, 0, 0, 0, /* jmpq relative */
0x66, 0x0f, 0x1f, 0x44, 0, 0 /* nopw (%rax,%rax,1) */
};
/* Subsequent entries for branches with BND prefx in a procedure linkage
table with BND relocations look like this. */
static const bfd_byte elf_x86_64_bnd_plt_entry[PLT_ENTRY_SIZE] =
{
0x68, 0, 0, 0, 0, /* pushq immediate */
0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
};
/* Entries for legacy branches in the second procedure linkage table
look like this. */
static const bfd_byte elf_x86_64_legacy_plt2_entry[8] =
{
0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
0x66, 0x90 /* xchg %ax,%ax */
};
/* Entries for branches with BND prefix in the second procedure linkage
table look like this. */
static const bfd_byte elf_x86_64_bnd_plt2_entry[8] =
{
0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
0x90 /* nop */
};
/* .eh_frame covering the .plt section. */
static const bfd_byte elf_x86_64_eh_frame_plt[] =
{
#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
PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
0, 0, 0, 0, /* CIE ID */
1, /* CIE version */
'z', 'R', 0, /* Augmentation string */
1, /* Code alignment factor */
0x78, /* Data alignment factor */
16, /* Return address column */
1, /* Augmentation size */
DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
DW_CFA_def_cfa, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
DW_CFA_offset + 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
DW_CFA_nop, DW_CFA_nop,
PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
0, 0, 0, 0, /* .plt size goes here */
0, /* Augmentation size */
DW_CFA_def_cfa_offset, 16, /* DW_CFA_def_cfa_offset: 16 */
DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
DW_CFA_def_cfa_offset, 24, /* DW_CFA_def_cfa_offset: 24 */
DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
11, /* Block length */
DW_OP_breg7, 8, /* DW_OP_breg7 (rsp): 8 */
DW_OP_breg16, 0, /* DW_OP_breg16 (rip): 0 */
DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
DW_OP_lit3, DW_OP_shl, DW_OP_plus,
DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
};
/* Architecture-specific backend data for x86-64. */
struct elf_x86_64_backend_data
{
/* Templates for the initial PLT entry and for subsequent entries. */
const bfd_byte *plt0_entry;
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. */
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. */
unsigned int plt_got_insn_size;
/* Offset of the end of the PC-relative jump to plt0_entry. */
unsigned int plt_plt_insn_end;
/* Offset into plt_entry where the initial value of the GOT entry points. */
unsigned int plt_lazy_offset;
/* .eh_frame covering the .plt section. */
const bfd_byte *eh_frame_plt;
unsigned int eh_frame_plt_size;
};
#define get_elf_x86_64_arch_data(bed) \
((const struct elf_x86_64_backend_data *) (bed)->arch_data)
#define get_elf_x86_64_backend_data(abfd) \
get_elf_x86_64_arch_data (get_elf_backend_data (abfd))
#define GET_PLT_ENTRY_SIZE(abfd) \
get_elf_x86_64_backend_data (abfd)->plt_entry_size
/* These are the standard parameters. */
static const struct elf_x86_64_backend_data elf_x86_64_arch_bed =
{
elf_x86_64_plt0_entry, /* plt0_entry */
elf_x86_64_plt_entry, /* plt_entry */
sizeof (elf_x86_64_plt_entry), /* plt_entry_size */
2, /* plt0_got1_offset */
8, /* plt0_got2_offset */
12, /* plt0_got2_insn_end */
2, /* plt_got_offset */
7, /* plt_reloc_offset */
12, /* plt_plt_offset */
6, /* plt_got_insn_size */
PLT_ENTRY_SIZE, /* plt_plt_insn_end */
6, /* plt_lazy_offset */
elf_x86_64_eh_frame_plt, /* eh_frame_plt */
sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
};
static const struct elf_x86_64_backend_data elf_x86_64_bnd_arch_bed =
{
elf_x86_64_bnd_plt0_entry, /* plt0_entry */
elf_x86_64_bnd_plt_entry, /* plt_entry */
sizeof (elf_x86_64_bnd_plt_entry), /* plt_entry_size */
2, /* plt0_got1_offset */
1+8, /* plt0_got2_offset */
1+12, /* plt0_got2_insn_end */
1+2, /* plt_got_offset */
1, /* plt_reloc_offset */
7, /* plt_plt_offset */
1+6, /* plt_got_insn_size */
11, /* plt_plt_insn_end */
0, /* plt_lazy_offset */
elf_x86_64_eh_frame_plt, /* eh_frame_plt */
sizeof (elf_x86_64_eh_frame_plt), /* eh_frame_plt_size */
};
#define elf_backend_arch_data &elf_x86_64_arch_bed
/* 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.
*/
#define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
((EH)->elf.root.type == bfd_link_hash_undefweak \
&& bfd_link_executable (INFO) \
&& (elf_x86_64_hash_table (INFO)->interp == NULL \
|| !(GOT_RELOC) \
|| (EH)->has_non_got_reloc \
|| !(INFO)->dynamic_undefined_weak))
/* x86-64 ELF linker hash entry. */
struct elf_x86_64_link_hash_entry
{
struct elf_link_hash_entry elf;
/* Track dynamic relocs copied for this symbol. */
struct elf_dyn_relocs *dyn_relocs;
#define GOT_UNKNOWN 0
#define GOT_NORMAL 1
#define GOT_TLS_GD 2
#define GOT_TLS_IE 3
#define GOT_TLS_GDESC 4
#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))
unsigned char tls_type;
/* 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. */
unsigned int needs_copy : 1;
/* TRUE if symbol has at least one BND relocation. */
unsigned int has_bnd_reloc : 1;
/* 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;
/* 0: symbol isn't __tls_get_addr.
1: symbol is __tls_get_addr.
2: symbol is unknown. */
unsigned int tls_get_addr : 2;
/* 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. Filled when has_bnd_reloc is
set. */
union gotplt_union plt_bnd;
/* Offset of the GOTPLT entry reserved for the TLS descriptor,
starting at the end of the jump table. */
bfd_vma tlsdesc_got;
};
#define elf_x86_64_hash_entry(ent) \
((struct elf_x86_64_link_hash_entry *)(ent))
struct elf_x86_64_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;
};
#define elf_x86_64_tdata(abfd) \
((struct elf_x86_64_obj_tdata *) (abfd)->tdata.any)
#define elf_x86_64_local_got_tls_type(abfd) \
(elf_x86_64_tdata (abfd)->local_got_tls_type)
#define elf_x86_64_local_tlsdesc_gotent(abfd) \
(elf_x86_64_tdata (abfd)->local_tlsdesc_gotent)
#define is_x86_64_elf(bfd) \
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
&& elf_tdata (bfd) != NULL \
&& elf_object_id (bfd) == X86_64_ELF_DATA)
static bfd_boolean
elf_x86_64_mkobject (bfd *abfd)
{
return bfd_elf_allocate_object (abfd, sizeof (struct elf_x86_64_obj_tdata),
X86_64_ELF_DATA);
}
/* x86-64 ELF linker hash table. */
struct elf_x86_64_link_hash_table
{
struct elf_link_hash_table elf;
/* Short-cuts to get to dynamic linker sections. */
asection *interp;
asection *sdynbss;
asection *srelbss;
asection *plt_eh_frame;
asection *plt_bnd;
asection *plt_got;
union
{
bfd_signed_vma refcount;
bfd_vma offset;
} tls_ld_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;
bfd_vma (*r_info) (bfd_vma, bfd_vma);
bfd_vma (*r_sym) (bfd_vma);
unsigned int pointer_r_type;
const char *dynamic_interpreter;
int dynamic_interpreter_size;
/* _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;
};
/* Get the x86-64 ELF linker hash table from a link_info structure. */
#define elf_x86_64_hash_table(p) \
(elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
== X86_64_ELF_DATA ? ((struct elf_x86_64_link_hash_table *) ((p)->hash)) : NULL)
#define elf_x86_64_compute_jump_table_size(htab) \
((htab)->elf.srelplt->reloc_count * GOT_ENTRY_SIZE)
/* Create an entry in an x86-64 ELF linker hash table. */
static struct bfd_hash_entry *
elf_x86_64_link_hash_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (entry == NULL)
{
entry = (struct bfd_hash_entry *)
bfd_hash_allocate (table,
sizeof (struct elf_x86_64_link_hash_entry));
if (entry == NULL)
return entry;
}
/* Call the allocation method of the superclass. */
entry = _bfd_elf_link_hash_newfunc (entry, table, string);
if (entry != NULL)
{
struct elf_x86_64_link_hash_entry *eh;
eh = (struct elf_x86_64_link_hash_entry *) entry;
eh->dyn_relocs = NULL;
eh->tls_type = GOT_UNKNOWN;
eh->needs_copy = 0;
eh->has_bnd_reloc = 0;
eh->has_got_reloc = 0;
eh->has_non_got_reloc = 0;
eh->tls_get_addr = 2;
eh->func_pointer_refcount = 0;
eh->plt_bnd.offset = (bfd_vma) -1;
eh->plt_got.offset = (bfd_vma) -1;
eh->tlsdesc_got = (bfd_vma) -1;
}
return entry;
}
/* Compute a hash of a local hash entry. We use elf_link_hash_entry
for local symbol so that we can handle local STT_GNU_IFUNC symbols
as global symbol. We reuse indx and dynstr_index for local symbol
hash since they aren't used by global symbols in this backend. */
static hashval_t
elf_x86_64_local_htab_hash (const void *ptr)
{
struct elf_link_hash_entry *h
= (struct elf_link_hash_entry *) ptr;
return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
}
/* Compare local hash entries. */
static int
elf_x86_64_local_htab_eq (const void *ptr1, const void *ptr2)
{
struct elf_link_hash_entry *h1
= (struct elf_link_hash_entry *) ptr1;
struct elf_link_hash_entry *h2
= (struct elf_link_hash_entry *) ptr2;
return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
}
/* Find and/or create a hash entry for local symbol. */
static struct elf_link_hash_entry *
elf_x86_64_get_local_sym_hash (struct elf_x86_64_link_hash_table *htab,
bfd *abfd, const Elf_Internal_Rela *rel,
bfd_boolean create)
{
struct elf_x86_64_link_hash_entry e, *ret;
asection *sec = abfd->sections;
hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
htab->r_sym (rel->r_info));
void **slot;
e.elf.indx = sec->id;
e.elf.dynstr_index = htab->r_sym (rel->r_info);
slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
create ? INSERT : NO_INSERT);
if (!slot)
return NULL;
if (*slot)
{
ret = (struct elf_x86_64_link_hash_entry *) *slot;
return &ret->elf;
}
ret = (struct elf_x86_64_link_hash_entry *)
objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
sizeof (struct elf_x86_64_link_hash_entry));
if (ret)
{
memset (ret, 0, sizeof (*ret));
ret->elf.indx = sec->id;
ret->elf.dynstr_index = htab->r_sym (rel->r_info);
ret->elf.dynindx = -1;
ret->func_pointer_refcount = 0;
ret->plt_got.offset = (bfd_vma) -1;
*slot = ret;
}
return &ret->elf;
}
/* Destroy an X86-64 ELF linker hash table. */
static void
elf_x86_64_link_hash_table_free (bfd *obfd)
{
struct elf_x86_64_link_hash_table *htab
= (struct elf_x86_64_link_hash_table *) obfd->link.hash;
if (htab->loc_hash_table)
htab_delete (htab->loc_hash_table);
if (htab->loc_hash_memory)
objalloc_free ((struct objalloc *) htab->loc_hash_memory);
_bfd_elf_link_hash_table_free (obfd);
}
/* Create an X86-64 ELF linker hash table. */
static struct bfd_link_hash_table *
elf_x86_64_link_hash_table_create (bfd *abfd)
{
struct elf_x86_64_link_hash_table *ret;
bfd_size_type amt = sizeof (struct elf_x86_64_link_hash_table);
ret = (struct elf_x86_64_link_hash_table *) bfd_zmalloc (amt);
if (ret == NULL)
return NULL;
if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
elf_x86_64_link_hash_newfunc,
sizeof (struct elf_x86_64_link_hash_entry),
X86_64_ELF_DATA))
{
free (ret);
return NULL;
}
if (ABI_64_P (abfd))
{
ret->r_info = elf64_r_info;
ret->r_sym = elf64_r_sym;
ret->pointer_r_type = R_X86_64_64;
ret->dynamic_interpreter = ELF64_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size = sizeof ELF64_DYNAMIC_INTERPRETER;
}
else
{
ret->r_info = elf32_r_info;
ret->r_sym = elf32_r_sym;
ret->pointer_r_type = R_X86_64_32;
ret->dynamic_interpreter = ELF32_DYNAMIC_INTERPRETER;
ret->dynamic_interpreter_size = sizeof ELF32_DYNAMIC_INTERPRETER;
}
ret->loc_hash_table = htab_try_create (1024,
elf_x86_64_local_htab_hash,
elf_x86_64_local_htab_eq,
NULL);
ret->loc_hash_memory = objalloc_create ();
if (!ret->loc_hash_table || !ret->loc_hash_memory)
{
elf_x86_64_link_hash_table_free (abfd);
return NULL;
}
ret->elf.root.hash_table_free = elf_x86_64_link_hash_table_free;
return &ret->elf.root;
}
/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
.rela.bss sections in DYNOBJ, and set up shortcuts to them in our
hash table. */
static bfd_boolean
elf_x86_64_create_dynamic_sections (bfd *dynobj,
struct bfd_link_info *info)
{
struct elf_x86_64_link_hash_table *htab;
if (!_bfd_elf_create_dynamic_sections (dynobj, info))
return FALSE;
htab = elf_x86_64_hash_table (info);
if (htab == NULL)
return FALSE;
/* Set the contents of the .interp section to the interpreter. */
if (bfd_link_executable (info) && !info->nointerp)
{
asection *s = bfd_get_linker_section (dynobj, ".interp");
if (s == NULL)
abort ();
s->size = htab->dynamic_interpreter_size;
s->contents = (unsigned char *) htab->dynamic_interpreter;
htab->interp = s;
}
htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
if (!htab->sdynbss)
abort ();
if (bfd_link_executable (info))
{
/* Always allow copy relocs for building executables. */
asection *s = bfd_get_linker_section (dynobj, ".rela.bss");
if (s == NULL)
{
const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
s = bfd_make_section_anyway_with_flags (dynobj,
".rela.bss",
(bed->dynamic_sec_flags
| SEC_READONLY));
if (s == NULL
|| ! bfd_set_section_alignment (dynobj, s,
bed->s->log_file_align))
return FALSE;
}
htab->srelbss = s;
}
if (!info->no_ld_generated_unwind_info
&& htab->plt_eh_frame == NULL
&& htab->elf.splt != NULL)
{
flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
| SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED);
htab->plt_eh_frame
= bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
if (htab->plt_eh_frame == NULL
|| !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 3))
return FALSE;
}
return TRUE;
}
/* Copy the extra info we tack onto an elf_link_hash_entry. */
static void
elf_x86_64_copy_indirect_symbol (struct bfd_link_info *info,
struct elf_link_hash_entry *dir,
struct elf_link_hash_entry *ind)
{
struct elf_x86_64_link_hash_entry *edir, *eind;
edir = (struct elf_x86_64_link_hash_entry *) dir;
eind = (struct elf_x86_64_link_hash_entry *) ind;
if (!edir->has_bnd_reloc)
edir->has_bnd_reloc = eind->has_bnd_reloc;
if (!edir->has_got_reloc)
edir->has_got_reloc = eind->has_got_reloc;
if (!edir->has_non_got_reloc)
edir->has_non_got_reloc = eind->has_non_got_reloc;
if (eind->dyn_relocs != NULL)
{
if (edir->dyn_relocs != NULL)
{
struct elf_dyn_relocs **pp;
struct elf_dyn_relocs *p;
/* Add reloc counts against the indirect sym to the direct sym
list. Merge any entries against the same section. */
for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
{
struct elf_dyn_relocs *q;
for (q = edir->dyn_relocs; q != NULL; q = q->next)
if (q->sec == p->sec)
{
q->pc_count += p->pc_count;
q->count += p->count;
*pp = p->next;
break;
}
if (q == NULL)
pp = &p->next;
}
*pp = edir->dyn_relocs;
}
edir->dyn_relocs = eind->dyn_relocs;
eind->dyn_relocs = NULL;
}
if (ind->root.type == bfd_link_hash_indirect
&& dir->got.refcount <= 0)
{
edir->tls_type = eind->tls_type;
eind->tls_type = GOT_UNKNOWN;
}
if (ELIMINATE_COPY_RELOCS
&& ind->root.type != bfd_link_hash_indirect
&& dir->dynamic_adjusted)
{
/* If called to transfer flags for a weakdef during processing
of elf_adjust_dynamic_symbol, don't copy non_got_ref.
We clear it ourselves for ELIMINATE_COPY_RELOCS. */
dir->ref_dynamic |= ind->ref_dynamic;
dir->ref_regular |= ind->ref_regular;
dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
dir->needs_plt |= ind->needs_plt;
dir->pointer_equality_needed |= ind->pointer_equality_needed;
}
else
{
if (eind->func_pointer_refcount > 0)
{
edir->func_pointer_refcount += eind->func_pointer_refcount;
eind->func_pointer_refcount = 0;
}
_bfd_elf_link_hash_copy_indirect (info, dir, ind);
}
}
static bfd_boolean
elf64_x86_64_elf_object_p (bfd *abfd)
{
/* Set the right machine number for an x86-64 elf64 file. */
bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x86_64);
return TRUE;
}
static bfd_boolean
elf32_x86_64_elf_object_p (bfd *abfd)
{
/* Set the right machine number for an x86-64 elf32 file. */
bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_x64_32);
return TRUE;
}
/* Return TRUE if the TLS access code sequence support transition
from R_TYPE. */
static bfd_boolean
elf_x86_64_check_tls_transition (bfd *abfd,
struct bfd_link_info *info,
asection *sec,
bfd_byte *contents,
Elf_Internal_Shdr *symtab_hdr,
struct elf_link_hash_entry **sym_hashes,
unsigned int r_type,
const Elf_Internal_Rela *rel,
const Elf_Internal_Rela *relend)
{
unsigned int val;
unsigned long r_symndx;
bfd_boolean largepic = FALSE;
struct elf_link_hash_entry *h;
bfd_vma offset;
struct elf_x86_64_link_hash_table *htab;
bfd_byte *call;
bfd_boolean indirect_call, tls_get_addr;
htab = elf_x86_64_hash_table (info);
offset = rel->r_offset;
switch (r_type)
{
case R_X86_64_TLSGD:
case R_X86_64_TLSLD:
if ((rel + 1) >= relend)
return FALSE;
if (r_type == R_X86_64_TLSGD)
{
/* Check transition from GD access model. For 64bit, only
.byte 0x66; leaq foo@tlsgd(%rip), %rdi
.word 0x6666; rex64; call __tls_get_addr@PLT
or
.byte 0x66; leaq foo@tlsgd(%rip), %rdi
.byte 0x66; rex64
call *__tls_get_addr@GOTPCREL(%rip)
which may be converted to
addr32 call __tls_get_addr
can transit to different access model. For 32bit, only
leaq foo@tlsgd(%rip), %rdi
.word 0x6666; rex64; call __tls_get_addr@PLT
or
leaq foo@tlsgd(%rip), %rdi
.byte 0x66; rex64
call *__tls_get_addr@GOTPCREL(%rip)
which may be converted to
addr32 call __tls_get_addr
can transit to different access model. For largepic,
we also support:
leaq foo@tlsgd(%rip), %rdi
movabsq $__tls_get_addr@pltoff, %rax
addq $r15, %rax
call *%rax
or
leaq foo@tlsgd(%rip), %rdi
movabsq $__tls_get_addr@pltoff, %rax
addq $rbx, %rax
call *%rax */
static const unsigned char leaq[] = { 0x66, 0x48, 0x8d, 0x3d };
if ((offset + 12) > sec->size)
return FALSE;
call = contents + offset + 4;
if (call[0] != 0x66
|| !((call[1] == 0x48
&& call[2] == 0xff
&& call[3] == 0x15)
|| (call[1] == 0x48
&& call[2] == 0x67
&& call[3] == 0xe8)
|| (call[1] == 0x66
&& call[2] == 0x48
&& call[3] == 0xe8)))
{
if (!ABI_64_P (abfd)
|| (offset + 19) > sec->size
|| offset < 3
|| memcmp (call - 7, leaq + 1, 3) != 0
|| memcmp (call, "\x48\xb8", 2) != 0
|| call[11] != 0x01
|| call[13] != 0xff
|| call[14] != 0xd0
|| !((call[10] == 0x48 && call[12] == 0xd8)
|| (call[10] == 0x4c && call[12] == 0xf8)))
return FALSE;
largepic = TRUE;
}
else if (ABI_64_P (abfd))
{
if (offset < 4
|| memcmp (contents + offset - 4, leaq, 4) != 0)
return FALSE;
}
else
{
if (offset < 3
|| memcmp (contents + offset - 3, leaq + 1, 3) != 0)
return FALSE;
}
indirect_call = call[2] == 0xff;
}
else
{
/* Check transition from LD access model. Only
leaq foo@tlsld(%rip), %rdi;
call __tls_get_addr@PLT
or
leaq foo@tlsld(%rip), %rdi;
call *__tls_get_addr@GOTPCREL(%rip)
which may be converted to
addr32 call __tls_get_addr
can transit to different access model. For largepic
we also support:
leaq foo@tlsld(%rip), %rdi
movabsq $__tls_get_addr@pltoff, %rax
addq $r15, %rax
call *%rax
or
leaq foo@tlsld(%rip), %rdi
movabsq $__tls_get_addr@pltoff, %rax
addq $rbx, %rax
call *%rax */
static const unsigned char lea[] = { 0x48, 0x8d, 0x3d };
if (offset < 3 || (offset + 9) > sec->size)
return FALSE;
if (memcmp (contents + offset - 3, lea, 3) != 0)
return FALSE;
call = contents + offset + 4;
if (!(call[0] == 0xe8
|| (call[0] == 0xff && call[1] == 0x15)
|| (call[0] == 0x67 && call[1] == 0xe8)))
{
if (!ABI_64_P (abfd)
|| (offset + 19) > sec->size
|| memcmp (call, "\x48\xb8", 2) != 0
|| call[11] != 0x01
|| call[13] != 0xff
|| call[14] != 0xd0
|| !((call[10] == 0x48 && call[12] == 0xd8)
|| (call[10] == 0x4c && call[12] == 0xf8)))
return FALSE;
largepic = TRUE;
}
indirect_call = call[0] == 0xff;
}
r_symndx = htab->r_sym (rel[1].r_info);
if (r_symndx < symtab_hdr->sh_info)
return FALSE;
tls_get_addr = FALSE;
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
if (h != NULL && h->root.root.string != NULL)
{
struct elf_x86_64_link_hash_entry *eh
= (struct elf_x86_64_link_hash_entry *) h;
tls_get_addr = eh->tls_get_addr == 1;
if (eh->tls_get_addr > 1)
{
/* Use strncmp to check __tls_get_addr since
__tls_get_addr may be versioned. */
if (strncmp (h->root.root.string, "__tls_get_addr", 14)
== 0)
{
eh->tls_get_addr = 1;
tls_get_addr = TRUE;
}
else
eh->tls_get_addr = 0;
}
}
if (!tls_get_addr)
return FALSE;
else if (largepic)
return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLTOFF64;
else if (indirect_call)
return ELF32_R_TYPE (rel[1].r_info) == R_X86_64_GOTPCRELX;
else
return (ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PC32
|| ELF32_R_TYPE (rel[1].r_info) == R_X86_64_PLT32);
case R_X86_64_GOTTPOFF:
/* Check transition from IE access model:
mov foo@gottpoff(%rip), %reg
add foo@gottpoff(%rip), %reg
*/
/* Check REX prefix first. */
if (offset >= 3 && (offset + 4) <= sec->size)
{
val = bfd_get_8 (abfd, contents + offset - 3);
if (val != 0x48 && val != 0x4c)
{
/* X32 may have 0x44 REX prefix or no REX prefix. */
if (ABI_64_P (abfd))
return FALSE;
}
}
else
{
/* X32 may not have any REX prefix. */
if (ABI_64_P (abfd))
return FALSE;
if (offset < 2 || (offset + 3) > sec->size)
return FALSE;
}
val = bfd_get_8 (abfd, contents + offset - 2);
if (val != 0x8b && val != 0x03)
return FALSE;
val = bfd_get_8 (abfd, contents + offset - 1);
return (val & 0xc7) == 5;
case R_X86_64_GOTPC32_TLSDESC:
/* Check transition from GDesc access model:
leaq x@tlsdesc(%rip), %rax
Make sure it's a leaq adding rip to a 32-bit offset
into any register, although it's probably almost always
going to be rax. */
if (offset < 3 || (offset + 4) > sec->size)
return FALSE;
val = bfd_get_8 (abfd, contents + offset - 3);
if ((val & 0xfb) != 0x48)
return FALSE;
if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
return FALSE;
val = bfd_get_8 (abfd, contents + offset - 1);
return (val & 0xc7) == 0x05;
case R_X86_64_TLSDESC_CALL:
/* Check transition from GDesc access model:
call *x@tlsdesc(%rax)
*/
if (offset + 2 <= sec->size)
{
/* Make sure that it's a call *x@tlsdesc(%rax). */
call = contents + offset;
return call[0] == 0xff && call[1] == 0x10;
}
return FALSE;
default:
abort ();
}
}
/* Return TRUE if the TLS access transition is OK or no transition
will be performed. Update R_TYPE if there is a transition. */
static bfd_boolean
elf_x86_64_tls_transition (struct bfd_link_info *info, bfd *abfd,
asection *sec, bfd_byte *contents,
Elf_Internal_Shdr *symtab_hdr,
struct elf_link_hash_entry **sym_hashes,
unsigned int *r_type, int tls_type,
const Elf_Internal_Rela *rel,
const Elf_Internal_Rela *relend,
struct elf_link_hash_entry *h,
unsigned long r_symndx,
bfd_boolean from_relocate_section)
{
unsigned int from_type = *r_type;
unsigned int to_type = from_type;
bfd_boolean check = TRUE;
/* Skip TLS transition for functions. */
if (h != NULL
&& (h->type == STT_FUNC
|| h->type == STT_GNU_IFUNC))
return TRUE;
switch (from_type)
{
case R_X86_64_TLSGD:
case R_X86_64_GOTPC32_TLSDESC:
case R_X86_64_TLSDESC_CALL:
case R_X86_64_GOTTPOFF:
if (bfd_link_executable (info))
{
if (h == NULL)
to_type = R_X86_64_TPOFF32;
else
to_type = R_X86_64_GOTTPOFF;
}
/* When we are called from elf_x86_64_relocate_section, there may
be additional transitions based on TLS_TYPE. */
if (from_relocate_section)
{
unsigned int new_to_type = to_type;
if (bfd_link_executable (info)
&& h != NULL
&& h->dynindx == -1
&& tls_type == GOT_TLS_IE)
new_to_type = R_X86_64_TPOFF32;
if (to_type == R_X86_64_TLSGD
|| to_type == R_X86_64_GOTPC32_TLSDESC
|| to_type == R_X86_64_TLSDESC_CALL)
{
if (tls_type == GOT_TLS_IE)
new_to_type = R_X86_64_GOTTPOFF;
}
/* We checked the transition before when we were called from
elf_x86_64_check_relocs. We only want to check the new
transition which hasn't been checked before. */
check = new_to_type != to_type && from_type == to_type;
to_type = new_to_type;
}
break;
case R_X86_64_TLSLD:
if (bfd_link_executable (info))
to_type = R_X86_64_TPOFF32;
break;
default:
return TRUE;
}
/* Return TRUE if there is no transition. */
if (from_type == to_type)
return TRUE;
/* Check if the transition can be performed. */
if (check
&& ! elf_x86_64_check_tls_transition (abfd, info, sec, contents,
symtab_hdr, sym_hashes,
from_type, rel, relend))
{
reloc_howto_type *from, *to;
const char *name;
from = elf_x86_64_rtype_to_howto (abfd, from_type);
to = elf_x86_64_rtype_to_howto (abfd, to_type);
if (h)
name = h->root.root.string;
else
{
struct elf_x86_64_link_hash_table *htab;
htab = elf_x86_64_hash_table (info);
if (htab == NULL)
name = "*unknown*";
else
{
Elf_Internal_Sym *isym;
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
}
}
(*_bfd_error_handler)
(_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
"in section `%A' failed"),
abfd, sec, from->name, to->name, name,
(unsigned long) rel->r_offset);
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
*r_type = to_type;
return TRUE;
}
/* Rename some of the generic section flags to better document how they
are used here. */
#define need_convert_load sec_flg0
#define check_relocs_failed sec_flg1
static bfd_boolean
elf_x86_64_need_pic (bfd *input_bfd, asection *sec,
struct elf_link_hash_entry *h,
Elf_Internal_Shdr *symtab_hdr,
Elf_Internal_Sym *isym,
reloc_howto_type *howto)
{
const char *v = "";
const char *und = "";
const char *pic = "";
const char *name;
if (h)
{
name = h->root.root.string;
switch (ELF_ST_VISIBILITY (h->other))
{
case STV_HIDDEN:
v = _("hidden symbol ");
break;
case STV_INTERNAL:
v = _("internal symbol ");
break;
case STV_PROTECTED:
v = _("protected symbol ");
break;
default:
v = _("symbol ");
pic = _("; recompile with -fPIC");
break;
}
if (!h->def_regular && !h->def_dynamic)
und = _("undefined ");
}
else
{
name = bfd_elf_sym_name (input_bfd, symtab_hdr, isym, NULL);
pic = _("; recompile with -fPIC");
}
(*_bfd_error_handler) (_("%B: relocation %s against %s%s`%s' can "
"not be used when making a shared object%s"),
input_bfd, howto->name, und, v, name, pic);
bfd_set_error (bfd_error_bad_value);
sec->check_relocs_failed = 1;
return FALSE;
}
/* With the local symbol, foo, we convert
mov foo@GOTPCREL(%rip), %reg
to
lea foo(%rip), %reg
and convert
call/jmp *foo@GOTPCREL(%rip)
to
nop call foo/jmp foo nop
When PIC is false, convert
test %reg, foo@GOTPCREL(%rip)
to
test $foo, %reg
and convert
binop foo@GOTPCREL(%rip), %reg
to
binop $foo, %reg
where binop is one of adc, add, and, cmp, or, sbb, sub, xor
instructions. */
static bfd_boolean
elf_x86_64_convert_load_reloc (bfd *abfd, asection *sec,
bfd_byte *contents,
Elf_Internal_Rela *irel,
struct elf_link_hash_entry *h,
bfd_boolean *converted,
struct bfd_link_info *link_info)
{
struct elf_x86_64_link_hash_table *htab;
bfd_boolean is_pic;
bfd_boolean require_reloc_pc32;
bfd_boolean relocx;
bfd_boolean to_reloc_pc32;
asection *tsec;
char symtype;
bfd_signed_vma raddend;
unsigned int opcode;
unsigned int modrm;
unsigned int r_type = ELF32_R_TYPE (irel->r_info);
unsigned int r_symndx;
bfd_vma toff;
bfd_vma roff = irel->r_offset;
if (roff < (r_type == R_X86_64_REX_GOTPCRELX ? 3 : 2))
return TRUE;
raddend = irel->r_addend;
/* Addend for 32-bit PC-relative relocation must be -4. */
if (raddend != -4)
return TRUE;
htab = elf_x86_64_hash_table (link_info);
is_pic = bfd_link_pic (link_info);
relocx = (r_type == R_X86_64_GOTPCRELX
|| r_type == R_X86_64_REX_GOTPCRELX);
/* TRUE if we can convert only to R_X86_64_PC32. Enable it for
--no-relax. */
require_reloc_pc32
= link_info->disable_target_specific_optimizations > 1;
r_symndx = htab->r_sym (irel->r_info);
opcode = bfd_get_8 (abfd, contents + roff - 2);
/* Convert mov to lea since it has been done for a while. */
if (opcode != 0x8b)
{
/* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
test, xor instructions. */
if (!relocx)
return TRUE;
}
/* We convert only to R_X86_64_PC32:
1. Branch.
2. R_X86_64_GOTPCREL since we can't modify REX byte.
3. require_reloc_pc32 is true.
4. PIC.
*/
to_reloc_pc32 = (opcode == 0xff
|| !relocx
|| require_reloc_pc32
|| is_pic);
/* Get the symbol referred to by the reloc. */
if (h == NULL)
{
Elf_Internal_Sym *isym
= bfd_sym_from_r_symndx (&htab->sym_cache, abfd, r_symndx);
/* Skip relocation against undefined symbols. */
if (isym->st_shndx == SHN_UNDEF)
return TRUE;
symtype = ELF_ST_TYPE (isym->st_info);
if (isym->st_shndx == SHN_ABS)
tsec = bfd_abs_section_ptr;
else if (isym->st_shndx == SHN_COMMON)
tsec = bfd_com_section_ptr;
else if (isym->st_shndx == SHN_X86_64_LCOMMON)
tsec = &_bfd_elf_large_com_section;
else
tsec = bfd_section_from_elf_index (abfd, isym->st_shndx);
toff = isym->st_value;
}
else
{
/* Undefined weak symbol is only bound locally in executable
and its reference is resolved as 0 without relocation
overflow. We can only perform this optimization for
GOTPCRELX relocations since we need to modify REX byte.
It is OK convert mov with R_X86_64_GOTPCREL to
R_X86_64_PC32. */
if ((relocx || opcode == 0x8b)
&& UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
TRUE,
elf_x86_64_hash_entry (h)))
{
if (opcode == 0xff)
{
/* Skip for branch instructions since R_X86_64_PC32
may overflow. */
if (require_reloc_pc32)
return TRUE;
}
else if (relocx)
{
/* For non-branch instructions, we can convert to
R_X86_64_32/R_X86_64_32S since we know if there
is a REX byte. */
to_reloc_pc32 = FALSE;
}
/* Since we don't know the current PC when PIC is true,
we can't convert to R_X86_64_PC32. */
if (to_reloc_pc32 && is_pic)
return TRUE;
goto convert;
}
/* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
ld.so may use its link-time address. */
else if ((h->def_regular
|| h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
&& h != htab->elf.hdynamic
&& SYMBOL_REFERENCES_LOCAL (link_info, h))
{
/* bfd_link_hash_new or bfd_link_hash_undefined is
set by an assignment in a linker script in
bfd_elf_record_link_assignment. */
if (h->def_regular
&& (h->root.type == bfd_link_hash_new
|| h->root.type == bfd_link_hash_undefined))
{
/* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
if (require_reloc_pc32)
return TRUE;
goto convert;
}
tsec = h->root.u.def.section;
toff = h->root.u.def.value;
symtype = h->type;
}
else
return TRUE;
}
/* Don't convert GOTPCREL relocation against large section. */
if (elf_section_data (tsec) != NULL
&& (elf_section_flags (tsec) & SHF_X86_64_LARGE) != 0)
return TRUE;
/* We can only estimate relocation overflow for R_X86_64_PC32. */
if (!to_reloc_pc32)
goto convert;
if (tsec->sec_info_type == SEC_INFO_TYPE_MERGE)
{
/* At this stage in linking, no SEC_MERGE symbol has been
adjusted, so all references to such symbols need to be
passed through _bfd_merged_section_offset. (Later, in
relocate_section, all SEC_MERGE symbols *except* for
section symbols have been adjusted.)
gas may reduce relocations against symbols in SEC_MERGE
sections to a relocation against the section symbol when
the original addend was zero. When the reloc is against
a section symbol we should include the addend in the
offset passed to _bfd_merged_section_offset, since the
location of interest is the original symbol. On the
other hand, an access to "sym+addend" where "sym" is not
a section symbol should not include the addend; Such an
access is presumed to be an offset from "sym"; The
location of interest is just "sym". */
if (symtype == STT_SECTION)
toff += raddend;
toff = _bfd_merged_section_offset (abfd, &tsec,
elf_section_data (tsec)->sec_info,
toff);
if (symtype != STT_SECTION)
toff += raddend;
}
else
toff += raddend;
/* Don't convert if R_X86_64_PC32 relocation overflows. */
if (tsec->output_section == sec->output_section)
{
if ((toff - roff + 0x80000000) > 0xffffffff)
return TRUE;
}
else
{
bfd_signed_vma distance;
/* At this point, we don't know the load addresses of TSEC
section nor SEC section. We estimate the distrance between
SEC and TSEC. We store the estimated distances in the
compressed_size field of the output section, which is only
used to decompress the compressed input section. */
if (sec->output_section->compressed_size == 0)
{
asection *asect;
bfd_size_type size = 0;
for (asect = link_info->output_bfd->sections;
asect != NULL;
asect = asect->next)
/* Skip debug sections since compressed_size is used to
compress debug sections. */
if ((asect->flags & SEC_DEBUGGING) == 0)
{
asection *i;
for (i = asect->map_head.s;
i != NULL;
i = i->map_head.s)
{
size = align_power (size, i->alignment_power);
size += i->size;
}
asect->compressed_size = size;
}
}
/* Don't convert GOTPCREL relocations if TSEC isn't placed
after SEC. */
distance = (tsec->output_section->compressed_size
- sec->output_section->compressed_size);
if (distance < 0)
return TRUE;
/* Take PT_GNU_RELRO segment into account by adding
maxpagesize. */
if ((toff + distance + get_elf_backend_data (abfd)->maxpagesize
- roff + 0x80000000) > 0xffffffff)
return TRUE;
}
convert:
if (opcode == 0xff)
{
/* We have "call/jmp *foo@GOTPCREL(%rip)". */
unsigned int nop;
unsigned int disp;
bfd_vma nop_offset;
/* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
R_X86_64_PC32. */
modrm = bfd_get_8 (abfd, contents + roff - 1);
if (modrm == 0x25)
{
/* Convert to "jmp foo nop". */
modrm = 0xe9;
nop = NOP_OPCODE;
nop_offset = irel->r_offset + 3;
disp = bfd_get_32 (abfd, contents + irel->r_offset);
irel->r_offset -= 1;
bfd_put_32 (abfd, disp, contents + irel->r_offset);
}
else
{
struct elf_x86_64_link_hash_entry *eh
= (struct elf_x86_64_link_hash_entry *) h;
/* Convert to "nop call foo". ADDR_PREFIX_OPCODE
is a nop prefix. */
modrm = 0xe8;
/* To support TLS optimization, always use addr32 prefix for
"call *__tls_get_addr@GOTPCREL(%rip)". */
if (eh && eh->tls_get_addr == 1)
{
nop = 0x67;
nop_offset = irel->r_offset - 2;
}
else
{
nop = link_info->call_nop_byte;
if (link_info->call_nop_as_suffix)
{
nop_offset = irel->r_offset + 3;
disp = bfd_get_32 (abfd, contents + irel->r_offset);
irel->r_offset -= 1;
bfd_put_32 (abfd, disp, contents + irel->r_offset);
}
else
nop_offset = irel->r_offset - 2;
}
}
bfd_put_8 (abfd, nop, contents + nop_offset);
bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
r_type = R_X86_64_PC32;
}
else
{
unsigned int rex;
unsigned int rex_mask = REX_R;
if (r_type == R_X86_64_REX_GOTPCRELX)
rex = bfd_get_8 (abfd, contents + roff - 3);
else
rex = 0;
if (opcode == 0x8b)
{
if (to_reloc_pc32)
{
/* Convert "mov foo@GOTPCREL(%rip), %reg" to
"lea foo(%rip), %reg". */
opcode = 0x8d;
r_type = R_X86_64_PC32;
}
else
{
/* Convert "mov foo@GOTPCREL(%rip), %reg" to
"mov $foo, %reg". */
opcode = 0xc7;
modrm = bfd_get_8 (abfd, contents + roff - 1);
modrm = 0xc0 | (modrm & 0x38) >> 3;
if ((rex & REX_W) != 0
&& ABI_64_P (link_info->output_bfd))
{
/* Keep the REX_W bit in REX byte for LP64. */
r_type = R_X86_64_32S;
goto rewrite_modrm_rex;
}
else
{
/* If the REX_W bit in REX byte isn't needed,
use R_X86_64_32 and clear the W bit to avoid
sign-extend imm32 to imm64. */
r_type = R_X86_64_32;
/* Clear the W bit in REX byte. */
rex_mask |= REX_W;
goto rewrite_modrm_rex;
}
}
}
else
{
/* R_X86_64_PC32 isn't supported. */
if (to_reloc_pc32)
return TRUE;
modrm = bfd_get_8 (abfd, contents + roff - 1);
if (opcode == 0x85)
{
/* Convert "test %reg, foo@GOTPCREL(%rip)" to
"test $foo, %reg". */
modrm = 0xc0 | (modrm & 0x38) >> 3;
opcode = 0xf7;
}
else
{
/* Convert "binop foo@GOTPCREL(%rip), %reg" to
"binop $foo, %reg". */
modrm = 0xc0 | (modrm & 0x38) >> 3 | (opcode & 0x3c);
opcode = 0x81;
}
/* Use R_X86_64_32 with 32-bit operand to avoid relocation
overflow when sign-extending imm32 to imm64. */
r_type = (rex & REX_W) != 0 ? R_X86_64_32S : R_X86_64_32;
rewrite_modrm_rex:
bfd_put_8 (abfd, modrm, contents + roff - 1);
if (rex)
{
/* Move the R bit to the B bit in REX byte. */
rex = (rex & ~rex_mask) | (rex & REX_R) >> 2;
bfd_put_8 (abfd, rex, contents + roff - 3);
}
/* No addend for R_X86_64_32/R_X86_64_32S relocations. */
irel->r_addend = 0;
}
bfd_put_8 (abfd, opcode, contents + roff - 2);
}
irel->r_info = htab->r_info (r_symndx, r_type);
*converted = TRUE;
return TRUE;
}
/* Look through the relocs for a section during the first phase, and
calculate needed space in the global offset table, procedure
linkage table, and dynamic reloc sections. */
static bfd_boolean
elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
asection *sec,
const Elf_Internal_Rela *relocs)
{
struct elf_x86_64_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;
bfd_byte *contents;
bfd_boolean use_plt_got;
if (bfd_link_relocatable (info))
return TRUE;
/* Don't do anything special with non-loaded, non-alloced sections.
In particular, any relocs in such sections should not affect GOT
and PLT reference counting (ie. we don't allow them to create GOT
or PLT entries), there's no possibility or desire to optimize TLS
relocs, and there's not much point in propagating relocs to shared
libs that the dynamic linker won't relocate. */
if ((sec->flags & SEC_ALLOC) == 0)
return TRUE;
BFD_ASSERT (is_x86_64_elf (abfd));
htab = elf_x86_64_hash_table (info);
if (htab == NULL)
{
sec->check_relocs_failed = 1;
return FALSE;
}
/* Get the section contents. */
if (elf_section_data (sec)->this_hdr.contents != NULL)
contents = elf_section_data (sec)->this_hdr.contents;
else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
{
sec->check_relocs_failed = 1;
return FALSE;
}
use_plt_got = get_elf_x86_64_backend_data (abfd) == &elf_x86_64_arch_bed;
symtab_hdr = &elf_symtab_hdr (abfd);
sym_hashes = elf_sym_hashes (abfd);
sreloc = NULL;
rel_end = relocs + sec->reloc_count;
for (rel = relocs; rel < rel_end; rel++)
{
unsigned int r_type;
unsigned long r_symndx;
struct elf_link_hash_entry *h;
struct elf_x86_64_link_hash_entry *eh;
Elf_Internal_Sym *isym;
const char *name;
bfd_boolean size_reloc;
r_symndx = htab->r_sym (rel->r_info);
r_type = ELF32_R_TYPE (rel->r_info);
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
{
(*_bfd_error_handler) (_("%B: bad symbol index: %d"),
abfd, r_symndx);
goto error_return;
}
if (r_symndx < symtab_hdr->sh_info)
{
/* A local symbol. */
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
if (isym == NULL)
goto error_return;
/* Check relocation against local STT_GNU_IFUNC symbol. */
if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
{
h = elf_x86_64_get_local_sym_hash (htab, abfd, rel,
TRUE);
if (h == NULL)
goto error_return;
/* Fake a STT_GNU_IFUNC symbol. */
h->type = STT_GNU_IFUNC;
h->def_regular = 1;
h->ref_regular = 1;
h->forced_local = 1;
h->root.type = bfd_link_hash_defined;
}
else
h = NULL;
}
else
{
isym = NULL;
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;
}
/* Check invalid x32 relocations. */
if (!ABI_64_P (abfd))
switch (r_type)
{
default:
break;
case R_X86_64_DTPOFF64:
case R_X86_64_TPOFF64:
case R_X86_64_PC64:
case R_X86_64_GOTOFF64:
case R_X86_64_GOT64:
case R_X86_64_GOTPCREL64:
case R_X86_64_GOTPC64:
case R_X86_64_GOTPLT64:
case R_X86_64_PLTOFF64:
{
if (h)
name = h->root.root.string;
else
name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
NULL);
(*_bfd_error_handler)
(_("%B: relocation %s against symbol `%s' isn't "
"supported in x32 mode"), abfd,
x86_64_elf_howto_table[r_type].name, name);
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
break;
}
if (h != NULL)
{
switch (r_type)
{
default:
break;
case R_X86_64_PC32_BND:
case R_X86_64_PLT32_BND:
case R_X86_64_PC32:
case R_X86_64_PLT32:
case R_X86_64_32:
case R_X86_64_64:
/* MPX PLT is supported only if elf_x86_64_arch_bed
is used in 64-bit mode. */
if (ABI_64_P (abfd)
&& info->bndplt
&& (get_elf_x86_64_backend_data (abfd)
== &elf_x86_64_arch_bed))
{
elf_x86_64_hash_entry (h)->has_bnd_reloc = 1;
/* Create the second PLT for Intel MPX support. */
if (htab->plt_bnd == NULL)
{
unsigned int plt_bnd_align;
const struct elf_backend_data *bed;
bed = get_elf_backend_data (info->output_bfd);
BFD_ASSERT (sizeof (elf_x86_64_bnd_plt2_entry) == 8
&& (sizeof (elf_x86_64_bnd_plt2_entry)
== sizeof (elf_x86_64_legacy_plt2_entry)));
plt_bnd_align = 3;
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
htab->plt_bnd
= bfd_make_section_anyway_with_flags (htab->elf.dynobj,
".plt.bnd",
(bed->dynamic_sec_flags
| SEC_ALLOC
| SEC_CODE
| SEC_LOAD
| SEC_READONLY));
if (htab->plt_bnd == NULL
|| !bfd_set_section_alignment (htab->elf.dynobj,
htab->plt_bnd,
plt_bnd_align))
goto error_return;
}
}
case R_X86_64_32S:
case R_X86_64_PC64:
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
case R_X86_64_GOTPCREL64:
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
/* Create the ifunc sections for static executables. */
if (h->type == STT_GNU_IFUNC
&& !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
info))
goto error_return;
break;
}
/* It is referenced by a non-shared object. */
h->ref_regular = 1;
h->root.non_ir_ref = 1;
if (h->type == STT_GNU_IFUNC)
elf_tdata (info->output_bfd)->has_gnu_symbols
|= elf_gnu_symbol_ifunc;
}
if (! elf_x86_64_tls_transition (info, abfd, sec, contents,
symtab_hdr, sym_hashes,
&r_type, GOT_UNKNOWN,
rel, rel_end, h, r_symndx, FALSE))
goto error_return;
eh = (struct elf_x86_64_link_hash_entry *) h;
switch (r_type)
{
case R_X86_64_TLSLD:
htab->tls_ld_got.refcount += 1;
goto create_got;
case R_X86_64_TPOFF32:
if (!bfd_link_executable (info) && ABI_64_P (abfd))
return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
&x86_64_elf_howto_table[r_type]);
if (eh != NULL)
eh->has_got_reloc = 1;
break;
case R_X86_64_GOTTPOFF:
if (!bfd_link_executable (info))
info->flags |= DF_STATIC_TLS;
/* Fall through */
case R_X86_64_GOT32:
case R_X86_64_GOTPCREL:
case R_X86_64_GOTPCRELX:
case R_X86_64_REX_GOTPCRELX:
case R_X86_64_TLSGD:
case R_X86_64_GOT64:
case R_X86_64_GOTPCREL64:
case R_X86_64_GOTPLT64:
case R_X86_64_GOTPC32_TLSDESC:
case R_X86_64_TLSDESC_CALL:
/* This symbol requires a global offset table entry. */
{
int tls_type, old_tls_type;
switch (r_type)
{
default: tls_type = GOT_NORMAL; break;
case R_X86_64_TLSGD: tls_type = GOT_TLS_GD; break;
case R_X86_64_GOTTPOFF: tls_type = GOT_TLS_IE; break;
case R_X86_64_GOTPC32_TLSDESC:
case R_X86_64_TLSDESC_CALL:
tls_type = GOT_TLS_GDESC; break;
}
if (h != NULL)
{
h->got.refcount += 1;
old_tls_type = eh->tls_type;
}
else
{
bfd_signed_vma *local_got_refcounts;
/* This is a global offset table entry for a local symbol. */
local_got_refcounts = elf_local_got_refcounts (abfd);
if (local_got_refcounts == NULL)
{
bfd_size_type size;
size = symtab_hdr->sh_info;
size *= sizeof (bfd_signed_vma)
+ sizeof (bfd_vma) + sizeof (char);
local_got_refcounts = ((bfd_signed_vma *)
bfd_zalloc (abfd, size));
if (local_got_refcounts == NULL)
goto error_return;
elf_local_got_refcounts (abfd) = local_got_refcounts;
elf_x86_64_local_tlsdesc_gotent (abfd)
= (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
elf_x86_64_local_got_tls_type (abfd)
= (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
}
local_got_refcounts[r_symndx] += 1;
old_tls_type
= elf_x86_64_local_got_tls_type (abfd) [r_symndx];
}
/* If a TLS symbol is accessed using IE at least once,
there is no point to use dynamic model for it. */
if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
&& (! GOT_TLS_GD_ANY_P (old_tls_type)
|| tls_type != GOT_TLS_IE))
{
if (old_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (tls_type))
tls_type = old_tls_type;
else if (GOT_TLS_GD_ANY_P (old_tls_type)
&& GOT_TLS_GD_ANY_P (tls_type))
tls_type |= old_tls_type;
else
{
if (h)
name = h->root.root.string;
else
name = bfd_elf_sym_name (abfd, symtab_hdr,
isym, NULL);
(*_bfd_error_handler)
(_("%B: '%s' accessed both as normal and thread local symbol"),
abfd, name);
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
}
if (old_tls_type != tls_type)
{
if (eh != NULL)
eh->tls_type = tls_type;
else
elf_x86_64_local_got_tls_type (abfd) [r_symndx] = tls_type;
}
}
/* Fall through */
case R_X86_64_GOTOFF64:
case R_X86_64_GOTPC32:
case R_X86_64_GOTPC64:
create_got:
if (eh != NULL)
eh->has_got_reloc = 1;
if (htab->elf.sgot == NULL)
{
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
if (!_bfd_elf_create_got_section (htab->elf.dynobj,
info))
goto error_return;
}
break;
case R_X86_64_PLT32:
case R_X86_64_PLT32_BND:
/* This symbol requires a procedure linkage table entry. We
actually build the entry in adjust_dynamic_symbol,
because this might be a case of linking PIC code which is
never referenced by a dynamic object, in which case we
don't need to generate a procedure linkage table entry
after all. */
/* If this is a local symbol, we resolve it directly without
creating a procedure linkage table entry. */
if (h == NULL)
continue;
eh->has_got_reloc = 1;
h->needs_plt = 1;
h->plt.refcount += 1;
break;
case R_X86_64_PLTOFF64:
/* This tries to form the 'address' of a function relative
to GOT. For global symbols we need a PLT entry. */
if (h != NULL)
{
h->needs_plt = 1;
h->plt.refcount += 1;
}
goto create_got;
case R_X86_64_SIZE32:
case R_X86_64_SIZE64:
size_reloc = TRUE;
goto do_size;
case R_X86_64_32:
if (!ABI_64_P (abfd))
goto pointer;
case R_X86_64_8:
case R_X86_64_16:
case R_X86_64_32S:
/* Check relocation overflow as these relocs may lead to
run-time relocation overflow. Don't error out for
sections we don't care about, such as debug sections or
when relocation overflow check is disabled. */
if (!info->no_reloc_overflow_check
&& (bfd_link_pic (info)
|| (bfd_link_executable (info)
&& h != NULL
&& !h->def_regular
&& h->def_dynamic
&& (sec->flags & SEC_READONLY) == 0)))
return elf_x86_64_need_pic (abfd, sec, h, symtab_hdr, isym,
&x86_64_elf_howto_table[r_type]);
/* Fall through. */
case R_X86_64_PC8:
case R_X86_64_PC16:
case R_X86_64_PC32:
case R_X86_64_PC32_BND:
case R_X86_64_PC64:
case R_X86_64_64:
pointer:
if (eh != NULL && (sec->flags & SEC_CODE) != 0)
eh->has_non_got_reloc = 1;
/* We are called after all symbols have been resolved. Only
relocation against STT_GNU_IFUNC symbol must go through
PLT. */
if (h != NULL
&& (bfd_link_executable (info)
|| h->type == STT_GNU_IFUNC))
{
/* If this reloc is in a read-only section, we might
need a copy reloc. We can't check reliably at this
stage whether the section is read-only, as input
sections have not yet been mapped to output sections.
Tentatively set the flag for now, and correct in
adjust_dynamic_symbol. */
h->non_got_ref = 1;
/* We may need a .plt entry if the symbol is a function
defined in a shared lib or is a STT_GNU_IFUNC function
referenced from the code or read-only section. */
if (!h->def_regular
|| (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
h->plt.refcount += 1;
if (r_type == R_X86_64_PC32)
{
/* Since something like ".long foo - ." may be used
as pointer, make sure that PLT is used if foo is
a function defined in a shared library. */
if ((sec->flags & SEC_CODE) == 0)
h->pointer_equality_needed = 1;
}
else if (r_type != R_X86_64_PC32_BND
&& r_type != R_X86_64_PC64)
{
h->pointer_equality_needed = 1;
/* At run-time, R_X86_64_64 can be resolved for both
x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
can only be resolved for x32. */
if ((sec->flags & SEC_READONLY) == 0
&& (r_type == R_X86_64_64
|| (!ABI_64_P (abfd)
&& (r_type == R_X86_64_32
|| r_type == R_X86_64_32S))))
eh->func_pointer_refcount += 1;
}
}
size_reloc = FALSE;
do_size:
/* If we are creating a shared library, and this is a reloc
against a global symbol, or a non PC relative reloc
against a local symbol, then we need to copy the reloc
into the shared library. However, if we are linking with
-Bsymbolic, we do not need to copy a reloc against a
global symbol which is defined in an object we are
including in the link (i.e., DEF_REGULAR is set). At
this point we have not seen all the input files, so it is
possible that DEF_REGULAR is not set now but will be set
later (it is never cleared). In case of a weak definition,
DEF_REGULAR may be cleared later by a strong definition in
a shared library. We account for that possibility below by
storing information in the relocs_copied field of the hash
table entry. A similar situation occurs when creating
shared libraries and symbol visibility changes render the
symbol local.
If on the other hand, we are creating an executable, we
may need to keep relocations for symbols satisfied by a
dynamic library if we manage to avoid copy relocs for the
symbol.
Generate dynamic pointer relocation against STT_GNU_IFUNC
symbol in the non-code section. */
if ((bfd_link_pic (info)
&& (! IS_X86_64_PCREL_TYPE (r_type)
|| (h != NULL
&& (! (bfd_link_pie (info)
|| SYMBOLIC_BIND (info, h))
|| h->root.type == bfd_link_hash_defweak
|| !h->def_regular))))
|| (h != NULL
&& h->type == STT_GNU_IFUNC
&& r_type == htab->pointer_r_type
&& (sec->flags & SEC_CODE) == 0)
|| (ELIMINATE_COPY_RELOCS
&& !bfd_link_pic (info)
&& h != NULL
&& (h->root.type == bfd_link_hash_defweak
|| !h->def_regular)))
{
struct elf_dyn_relocs *p;
struct elf_dyn_relocs **head;
/* We must copy these reloc types into the output file.
Create a reloc section in dynobj and make room for
this reloc. */
if (sreloc == NULL)
{
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
sreloc = _bfd_elf_make_dynamic_reloc_section
(sec, htab->elf.dynobj, ABI_64_P (abfd) ? 3 : 2,
abfd, /*rela?*/ TRUE);
if (sreloc == NULL)
goto error_return;
}
/* If this is a global symbol, we count the number of
relocations we need for this symbol. */
if (h != NULL)
head = &eh->dyn_relocs;
else
{
/* Track dynamic relocs needed for local syms too.
We really need local syms available to do this
easily. Oh well. */
asection *s;
void **vpp;
isym = bfd_sym_from_r_symndx (&htab->sym_cache,
abfd, r_symndx);
if (isym == NULL)
goto error_return;
s = bfd_section_from_elf_index (abfd, isym->st_shndx);
if (s == NULL)
s = sec;
/* Beware of type punned pointers vs strict aliasing
rules. */
vpp = &(elf_section_data (s)->local_dynrel);
head = (struct elf_dyn_relocs **)vpp;
}
p = *head;
if (p == NULL || p->sec != sec)
{
bfd_size_type amt = sizeof *p;
p = ((struct elf_dyn_relocs *)
bfd_alloc (htab->elf.dynobj, amt));
if (p == NULL)
goto error_return;
p->next = *head;
*head = p;
p->sec = sec;
p->count = 0;
p->pc_count = 0;
}
p->count += 1;
/* Count size relocation as PC-relative relocation. */
if (IS_X86_64_PCREL_TYPE (r_type) || size_reloc)
p->pc_count += 1;
}
break;
/* This relocation describes the C++ object vtable hierarchy.
Reconstruct it for later use during GC. */
case R_X86_64_GNU_VTINHERIT:
if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
goto error_return;
break;
/* This relocation describes which C++ vtable entries are actually
used. Record for later use during GC. */
case R_X86_64_GNU_VTENTRY:
BFD_ASSERT (h != NULL);
if (h != NULL
&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend))
goto error_return;
break;
default:
break;
}
if (use_plt_got
&& h != NULL
&& h->plt.