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binutils-gdb/bfd/mach-o-i386.c

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/* Intel i386 Mach-O support for BFD.
Copyright (C) 2009-2017 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 "mach-o.h"
#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"
#include "mach-o/reloc.h"
#define bfd_mach_o_object_p bfd_mach_o_i386_object_p
#define bfd_mach_o_core_p bfd_mach_o_i386_core_p
#define bfd_mach_o_mkobject bfd_mach_o_i386_mkobject
static const bfd_target *
bfd_mach_o_i386_object_p (bfd *abfd)
{
return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_I386);
}
static const bfd_target *
bfd_mach_o_i386_core_p (bfd *abfd)
{
return bfd_mach_o_header_p (abfd, 0,
BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_I386);
}
static bfd_boolean
bfd_mach_o_i386_mkobject (bfd *abfd)
{
bfd_mach_o_data_struct *mdata;
if (!bfd_mach_o_mkobject_init (abfd))
return FALSE;
mdata = bfd_mach_o_get_data (abfd);
mdata->header.magic = BFD_MACH_O_MH_MAGIC;
mdata->header.cputype = BFD_MACH_O_CPU_TYPE_I386;
mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_X86_ALL;
mdata->header.byteorder = BFD_ENDIAN_LITTLE;
mdata->header.version = 1;
return TRUE;
}
static reloc_howto_type i386_howto_table[]=
{
/* 0 */
HOWTO(BFD_RELOC_32, 0, 2, 32, FALSE, 0,
complain_overflow_bitfield,
NULL, "32",
FALSE, 0xffffffff, 0xffffffff, FALSE),
HOWTO(BFD_RELOC_16, 0, 1, 16, FALSE, 0,
complain_overflow_bitfield,
NULL, "16",
FALSE, 0xffff, 0xffff, FALSE),
HOWTO(BFD_RELOC_8, 0, 0, 8, FALSE, 0,
complain_overflow_bitfield,
NULL, "8",
FALSE, 0xff, 0xff, FALSE),
HOWTO(BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0,
complain_overflow_bitfield,
NULL, "DISP32",
FALSE, 0xffffffff, 0xffffffff, TRUE),
/* 4 */
HOWTO(BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0,
complain_overflow_bitfield,
NULL, "DISP16",
FALSE, 0xffff, 0xffff, TRUE),
HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 32, FALSE, 0,
complain_overflow_bitfield,
NULL, "SECTDIFF_32",
FALSE, 0xffffffff, 0xffffffff, FALSE),
HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 32, FALSE, 0,
complain_overflow_bitfield,
NULL, "LSECTDIFF_32",
FALSE, 0xffffffff, 0xffffffff, FALSE),
HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 2, 32, FALSE, 0,
complain_overflow_bitfield,
NULL, "PAIR_32",
FALSE, 0xffffffff, 0xffffffff, FALSE),
/* 8 */
HOWTO(BFD_RELOC_MACH_O_SECTDIFF, 0, 1, 16, FALSE, 0,
complain_overflow_bitfield,
NULL, "SECTDIFF_16",
FALSE, 0xffff, 0xffff, FALSE),
HOWTO(BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 1, 16, FALSE, 0,
complain_overflow_bitfield,
NULL, "LSECTDIFF_16",
FALSE, 0xffff, 0xffff, FALSE),
HOWTO(BFD_RELOC_MACH_O_PAIR, 0, 1, 16, FALSE, 0,
complain_overflow_bitfield,
NULL, "PAIR_16",
FALSE, 0xffff, 0xffff, FALSE),
};
static bfd_boolean
bfd_mach_o_i386_canonicalize_one_reloc (bfd *abfd,
struct mach_o_reloc_info_external *raw,
arelent *res, asymbol **syms)
{
bfd_mach_o_reloc_info reloc;
if (!bfd_mach_o_pre_canonicalize_one_reloc (abfd, raw, &reloc, res, syms))
return FALSE;
if (reloc.r_scattered)
{
switch (reloc.r_type)
{
case BFD_MACH_O_GENERIC_RELOC_PAIR:
if (reloc.r_length == 2)
{
res->howto = &i386_howto_table[7];
res->address = res[-1].address;
return TRUE;
}
else if (reloc.r_length == 1)
{
res->howto = &i386_howto_table[10];
res->address = res[-1].address;
return TRUE;
}
return FALSE;
case BFD_MACH_O_GENERIC_RELOC_SECTDIFF:
if (reloc.r_length == 2)
{
res->howto = &i386_howto_table[5];
return TRUE;
}
else if (reloc.r_length == 1)
{
res->howto = &i386_howto_table[8];
return TRUE;
}
return FALSE;
case BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF:
if (reloc.r_length == 2)
{
res->howto = &i386_howto_table[6];
return TRUE;
}
else if (reloc.r_length == 1)
{
res->howto = &i386_howto_table[9];
return TRUE;
}
return FALSE;
default:
return FALSE;
}
}
else
{
switch (reloc.r_type)
{
case BFD_MACH_O_GENERIC_RELOC_VANILLA:
switch ((reloc.r_length << 1) | reloc.r_pcrel)
{
case 0: /* len = 0, pcrel = 0 */
res->howto = &i386_howto_table[2];
return TRUE;
case 2: /* len = 1, pcrel = 0 */
res->howto = &i386_howto_table[1];
return TRUE;
case 3: /* len = 1, pcrel = 1 */
res->howto = &i386_howto_table[4];
return TRUE;
case 4: /* len = 2, pcrel = 0 */
res->howto = &i386_howto_table[0];
return TRUE;
case 5: /* len = 2, pcrel = 1 */
res->howto = &i386_howto_table[3];
return TRUE;
default:
return FALSE;
}
break;
default:
return FALSE;
}
}
}
static bfd_boolean
bfd_mach_o_i386_swap_reloc_out (arelent *rel, bfd_mach_o_reloc_info *rinfo)
{
rinfo->r_address = rel->address;
switch (rel->howto->type)
{
case BFD_RELOC_32:
case BFD_RELOC_32_PCREL:
case BFD_RELOC_16:
case BFD_RELOC_16_PCREL:
case BFD_RELOC_8:
rinfo->r_scattered = 0;
rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_VANILLA;
rinfo->r_pcrel = rel->howto->pc_relative;
rinfo->r_length = rel->howto->size; /* Correct in practice. */
if ((*rel->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
{
rinfo->r_extern = 0;
rinfo->r_value =
(*rel->sym_ptr_ptr)->section->output_section->target_index;
}
else
{
rinfo->r_extern = 1;
rinfo->r_value = (*rel->sym_ptr_ptr)->udata.i;
}
break;
case BFD_RELOC_MACH_O_SECTDIFF:
rinfo->r_scattered = 1;
rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_SECTDIFF;
rinfo->r_pcrel = 0;
rinfo->r_length = rel->howto->size;
rinfo->r_extern = 0;
rinfo->r_value = rel->addend;
break;
case BFD_RELOC_MACH_O_LOCAL_SECTDIFF:
rinfo->r_scattered = 1;
rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_LOCAL_SECTDIFF;
rinfo->r_pcrel = 0;
rinfo->r_length = rel->howto->size;
rinfo->r_extern = 0;
rinfo->r_value = rel->addend;
break;
case BFD_RELOC_MACH_O_PAIR:
rinfo->r_address = 0;
rinfo->r_scattered = 1;
rinfo->r_type = BFD_MACH_O_GENERIC_RELOC_PAIR;
rinfo->r_pcrel = 0;
rinfo->r_length = rel->howto->size;
rinfo->r_extern = 0;
rinfo->r_value = rel->addend;
break;
default:
return FALSE;
}
return TRUE;
}
static reloc_howto_type *
bfd_mach_o_i386_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < sizeof (i386_howto_table) / sizeof (*i386_howto_table); i++)
if (code == i386_howto_table[i].type)
return &i386_howto_table[i];
return NULL;
}
static reloc_howto_type *
bfd_mach_o_i386_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *name ATTRIBUTE_UNUSED)
{
return NULL;
}
static bfd_boolean
bfd_mach_o_i386_print_thread (bfd *abfd, bfd_mach_o_thread_flavour *thread,
void *vfile, char *buf)
{
FILE *file = (FILE *)vfile;
switch (thread->flavour)
{
case BFD_MACH_O_x86_THREAD_STATE:
if (thread->size < (8 + 16 * 4))
return FALSE;
fprintf (file, " x86_THREAD_STATE:\n");
fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 0),
(unsigned long)bfd_get_32 (abfd, buf + 4));
fprintf (file, " eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 8),
(unsigned long)bfd_get_32 (abfd, buf + 12),
(unsigned long)bfd_get_32 (abfd, buf + 16),
(unsigned long)bfd_get_32 (abfd, buf + 20));
fprintf (file, " edi: %08lx esi: %08lx ebp: %08lx esp: %08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 24),
(unsigned long)bfd_get_32 (abfd, buf + 28),
(unsigned long)bfd_get_32 (abfd, buf + 32),
(unsigned long)bfd_get_32 (abfd, buf + 36));
fprintf (file, " ss: %08lx flg: %08lx eip: %08lx cs: %08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 40),
(unsigned long)bfd_get_32 (abfd, buf + 44),
(unsigned long)bfd_get_32 (abfd, buf + 48),
(unsigned long)bfd_get_32 (abfd, buf + 52));
fprintf (file, " ds: %08lx es: %08lx fs: %08lx gs: %08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 56),
(unsigned long)bfd_get_32 (abfd, buf + 60),
(unsigned long)bfd_get_32 (abfd, buf + 64),
(unsigned long)bfd_get_32 (abfd, buf + 68));
return TRUE;
case BFD_MACH_O_x86_FLOAT_STATE:
if (thread->size < 8)
return FALSE;
fprintf (file, " x86_FLOAT_STATE:\n");
fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 0),
(unsigned long)bfd_get_32 (abfd, buf + 4));
return TRUE;
case BFD_MACH_O_x86_EXCEPTION_STATE:
if (thread->size < 8 + 3 * 4)
return FALSE;
fprintf (file, " x86_EXCEPTION_STATE:\n");
fprintf (file, " flavor: 0x%08lx count: 0x%08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 0),
(unsigned long)bfd_get_32 (abfd, buf + 4));
fprintf (file, " trapno: %08lx err: %08lx faultaddr: %08lx\n",
(unsigned long)bfd_get_32 (abfd, buf + 8),
(unsigned long)bfd_get_32 (abfd, buf + 12),
(unsigned long)bfd_get_32 (abfd, buf + 16));
return TRUE;
default:
break;
}
return FALSE;
}
static const mach_o_section_name_xlat text_section_names_xlat[] =
{
{ ".symbol_stub", "__symbol_stub",
SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
0},
{ ".picsymbol_stub", "__picsymbol_stub",
SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS,
0},
{ NULL, NULL, 0, 0, 0, 0}
};
static const mach_o_section_name_xlat data_section_names_xlat[] =
{
/* The first two are recognized by i386, but not emitted for x86 by
modern GCC. */
{ ".non_lazy_symbol_pointer", "__nl_symbol_ptr",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ ".lazy_symbol_pointer", "__la_symbol_ptr",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ ".lazy_symbol_pointer2", "__la_sym_ptr2",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ ".lazy_symbol_pointer3", "__la_sym_ptr3",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_LAZY_SYMBOL_POINTERS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ NULL, NULL, 0, 0, 0, 0}
};
static const mach_o_section_name_xlat import_section_names_xlat[] =
{
{ ".picsymbol_stub3", "__jump_table",
SEC_CODE | SEC_LOAD, BFD_MACH_O_S_SYMBOL_STUBS,
BFD_MACH_O_S_ATTR_PURE_INSTRUCTIONS
| BFD_MACH_O_S_SELF_MODIFYING_CODE,
6},
{ ".non_lazy_symbol_pointer_x86", "__pointers",
SEC_DATA | SEC_LOAD, BFD_MACH_O_S_NON_LAZY_SYMBOL_POINTERS,
BFD_MACH_O_S_ATTR_NONE, 2},
{ NULL, NULL, 0, 0, 0, 0}
};
const mach_o_segment_name_xlat mach_o_i386_segsec_names_xlat[] =
{
{ "__TEXT", text_section_names_xlat },
{ "__DATA", data_section_names_xlat },
{ "__IMPORT", import_section_names_xlat },
{ NULL, NULL }
};
#define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_i386_canonicalize_one_reloc
#define bfd_mach_o_swap_reloc_out bfd_mach_o_i386_swap_reloc_out
#define bfd_mach_o_print_thread bfd_mach_o_i386_print_thread
#define bfd_mach_o_tgt_seg_table mach_o_i386_segsec_names_xlat
#define bfd_mach_o_section_type_valid_for_tgt NULL
#define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_i386_bfd_reloc_type_lookup
#define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_i386_bfd_reloc_name_lookup
#define TARGET_NAME i386_mach_o_vec
#define TARGET_STRING "mach-o-i386"
#define TARGET_ARCHITECTURE bfd_arch_i386
#define TARGET_PAGESIZE 4096
#define TARGET_BIG_ENDIAN 0
#define TARGET_ARCHIVE 0
#define TARGET_PRIORITY 0
#include "mach-o-target.c"
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