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/* ARM Mach-O support for BFD.
Copyright (C) 2015-2023 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 "libbfd.h"
#include "libiberty.h"
#include "mach-o.h"
#include "mach-o/arm.h"
#define bfd_mach_o_object_p bfd_mach_o_arm_object_p
#define bfd_mach_o_core_p bfd_mach_o_arm_core_p
#define bfd_mach_o_mkobject bfd_mach_o_arm_mkobject
#define bfd_mach_o_canonicalize_one_reloc bfd_mach_o_arm_canonicalize_one_reloc
#define bfd_mach_o_swap_reloc_out NULL
#define bfd_mach_o_bfd_reloc_type_lookup bfd_mach_o_arm_bfd_reloc_type_lookup
#define bfd_mach_o_bfd_reloc_name_lookup bfd_mach_o_arm_bfd_reloc_name_lookup
#define bfd_mach_o_print_thread NULL
#define bfd_mach_o_tgt_seg_table NULL
#define bfd_mach_o_section_type_valid_for_tgt NULL
static bfd_cleanup
bfd_mach_o_arm_object_p (bfd *abfd)
{
return bfd_mach_o_header_p (abfd, 0, 0, BFD_MACH_O_CPU_TYPE_ARM);
}
static bfd_cleanup
bfd_mach_o_arm_core_p (bfd *abfd)
{
return bfd_mach_o_header_p (abfd, 0,
BFD_MACH_O_MH_CORE, BFD_MACH_O_CPU_TYPE_ARM);
}
static bool
bfd_mach_o_arm_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_ARM;
mdata->header.cpusubtype = BFD_MACH_O_CPU_SUBTYPE_ARM_ALL;
mdata->header.byteorder = BFD_ENDIAN_LITTLE;
mdata->header.version = 1;
return true;
}
static reloc_howto_type arm_howto_table[]=
{
/* 0 */
HOWTO (BFD_RELOC_32, 0, 4, 32, false, 0,
complain_overflow_bitfield,
NULL, "32",
false, 0xffffffff, 0xffffffff, false),
HOWTO (BFD_RELOC_16, 0, 2, 16, false, 0,
complain_overflow_bitfield,
NULL, "16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_8, 0, 1, 8, false, 0,
complain_overflow_bitfield,
NULL, "8",
false, 0xff, 0xff, false),
HOWTO (BFD_RELOC_32_PCREL, 0, 4, 32, true, 0,
complain_overflow_bitfield,
NULL, "DISP32",
false, 0xffffffff, 0xffffffff, true),
/* 4 */
HOWTO (BFD_RELOC_16_PCREL, 0, 2, 16, true, 0,
complain_overflow_bitfield,
NULL, "DISP16",
false, 0xffff, 0xffff, true),
HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 4, 32, false, 0,
complain_overflow_bitfield,
NULL, "SECTDIFF_32",
false, 0xffffffff, 0xffffffff, false),
HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 4, 32, false, 0,
complain_overflow_bitfield,
NULL, "LSECTDIFF_32",
false, 0xffffffff, 0xffffffff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 4, 32, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_32",
false, 0xffffffff, 0xffffffff, false),
/* 8 */
HOWTO (BFD_RELOC_MACH_O_SECTDIFF, 0, 2, 16, false, 0,
complain_overflow_bitfield,
NULL, "SECTDIFF_16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_MACH_O_LOCAL_SECTDIFF, 0, 2, 16, false, 0,
complain_overflow_bitfield,
NULL, "LSECTDIFF_16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 2, 16, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_16",
false, 0xffff, 0xffff, false),
HOWTO (BFD_RELOC_ARM_PCREL_CALL, 2, 4, 24, true, 0,
complain_overflow_signed,
NULL, "BR24",
false, 0x00ffffff, 0x00ffffff, true),
/* 12 */
HOWTO (BFD_RELOC_ARM_MOVW, 0, 4, 16, false, 0,
complain_overflow_dont,
NULL, "MOVW",
false, 0x000f0fff, 0x000f0fff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 4, 16, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_W",
false, 0x000f0fff, 0x000f0fff, false),
HOWTO (BFD_RELOC_ARM_MOVT, 0, 4, 16, false, 0,
complain_overflow_bitfield,
NULL, "MOVT",
false, 0x000f0fff, 0x000f0fff, false),
HOWTO (BFD_RELOC_MACH_O_PAIR, 0, 4, 16, false, 0,
complain_overflow_bitfield,
NULL, "PAIR_T",
false, 0x000f0fff, 0x000f0fff, false),
/* 16 */
HOWTO (BFD_RELOC_THUMB_PCREL_BLX, 2, 4, 24, true, 0,
complain_overflow_signed,
NULL, "TBR22",
false, 0x07ff2fff, 0x07ff2fff, true)
};
static bool
bfd_mach_o_arm_canonicalize_one_reloc (bfd * abfd,
struct mach_o_reloc_info_external * raw,
arelent * res,
asymbol ** syms,
arelent * res_base)
{
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_ARM_RELOC_PAIR:
/* PR 21813: Check for a corrupt PAIR reloc at the start. */
if (res == res_base)
{
_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
"reloc is first reloc"));
return false;
}
if (reloc.r_length == 2)
{
res->howto = &arm_howto_table[7];
res->address = res[-1].address;
return true;
}
else if (reloc.r_length == 1)
{
res->howto = &arm_howto_table[10];
res->address = res[-1].address;
return true;
}
_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
"invalid length: %d"), reloc.r_length);
return false;
case BFD_MACH_O_ARM_RELOC_SECTDIFF:
if (reloc.r_length == 2)
{
res->howto = &arm_howto_table[5];
return true;
}
else if (reloc.r_length == 1)
{
res->howto = &arm_howto_table[8];
return true;
}
_bfd_error_handler (_("malformed mach-o ARM sectdiff reloc: "
"invalid length: %d"), reloc.r_length);
return false;
case BFD_MACH_O_ARM_RELOC_LOCAL_SECTDIFF:
if (reloc.r_length == 2)
{
res->howto = &arm_howto_table[6];
return true;
}
else if (reloc.r_length == 1)
{
res->howto = &arm_howto_table[9];
return true;
}
_bfd_error_handler (_("malformed mach-o ARM local sectdiff reloc: "
"invalid length: %d"),
reloc.r_length);
return false;
case BFD_MACH_O_ARM_RELOC_HALF_SECTDIFF:
switch (reloc.r_length)
{
case 2: /* :lower16: for movw arm. */
res->howto = &arm_howto_table[12];
return true;
case 3: /* :upper16: for movt arm. */
res->howto = &arm_howto_table[14];
return true;
}
_bfd_error_handler (_("malformed mach-o ARM half sectdiff reloc: "
"invalid length: %d"),
reloc.r_length);
return false;
default:
break;
}
}
else
{
switch (reloc.r_type)
{
case BFD_MACH_O_ARM_RELOC_VANILLA:
switch ((reloc.r_length << 1) | reloc.r_pcrel)
{
case 0: /* len = 0, pcrel = 0 */
res->howto = &arm_howto_table[2];
return true;
case 2: /* len = 1, pcrel = 0 */
res->howto = &arm_howto_table[1];
return true;
case 3: /* len = 1, pcrel = 1 */
res->howto = &arm_howto_table[4];
return true;
case 4: /* len = 2, pcrel = 0 */
res->howto = &arm_howto_table[0];
return true;
case 5: /* len = 2, pcrel = 1 */
res->howto = &arm_howto_table[3];
return true;
default:
_bfd_error_handler (_("malformed mach-o ARM vanilla reloc: "
"invalid length: %d (pcrel: %d)"),
reloc.r_length, reloc.r_pcrel);
return false;
}
break;
case BFD_MACH_O_ARM_RELOC_BR24:
if (reloc.r_length == 2 && reloc.r_pcrel == 1)
{
res->howto = &arm_howto_table[11];
return true;
}
break;
case BFD_MACH_O_THUMB_RELOC_BR22:
if (reloc.r_length == 2 && reloc.r_pcrel == 1)
{
res->howto = &arm_howto_table[16];
return true;
}
break;
case BFD_MACH_O_ARM_RELOC_HALF:
if (reloc.r_pcrel == 0)
switch (reloc.r_length)
{
case 0: /* :lower16: for movw arm. */
res->howto = &arm_howto_table[12];
return true;
case 1: /* :upper16: for movt arm. */
res->howto = &arm_howto_table[14];
return true;
}
break;
case BFD_MACH_O_ARM_RELOC_PAIR:
if (res == res_base)
{
_bfd_error_handler (_("malformed mach-o ARM reloc pair: "
"reloc is first reloc"));
return false;
}
if (res[-1].howto == &arm_howto_table[12]
&& reloc.r_length == 0)
{
/* Pair for :lower16: of movw arm. */
res->howto = &arm_howto_table[13];
/* This reloc contains the other half in its r_address field. */
res[-1].addend += (res->address & 0xffff) << 16;
res->address = res[-1].address;
return true;
}
else if (res[-1].howto == &arm_howto_table[14]
&& reloc.r_length == 1)
{
/* Pair for :upper16: of movt arm. */
res->howto = &arm_howto_table[15];
/* This reloc contains the other half in its r_address field. */
res[-1].addend += res->address & 0xffff;
res->address = res[-1].address;
return true;
}
break;
default:
break;
}
}
_bfd_error_handler (_("malformed mach-o ARM reloc: "
"unknown reloc type: %d"), reloc.r_length);
return false;
}
static reloc_howto_type *
bfd_mach_o_arm_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
unsigned int i;
for (i = 0; i < sizeof (arm_howto_table) / sizeof (*arm_howto_table); i++)
if (code == arm_howto_table[i].type)
return &arm_howto_table[i];
return NULL;
}
static reloc_howto_type *
bfd_mach_o_arm_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *name ATTRIBUTE_UNUSED)
{
return NULL;
}
#define TARGET_NAME arm_mach_o_vec
#define TARGET_STRING "mach-o-arm"
#define TARGET_ARCHITECTURE bfd_arch_arm
#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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