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/* BFD support for the Intel 386 architecture.
Copyright (C) 1992-2024 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"
extern void * bfd_arch_i386_short_nop_fill (bfd_size_type, bool,
bool);
static const bfd_arch_info_type *
bfd_i386_compatible (const bfd_arch_info_type *a,
const bfd_arch_info_type *b)
{
const bfd_arch_info_type *compat = bfd_default_compatible (a, b);
/* Don't allow mixing x64_32 with x86_64. */
if (compat
&& (a->mach & bfd_mach_x64_32) != (b->mach & bfd_mach_x64_32))
compat = NULL;
return compat;
}
/* Fill the buffer with zero or nop instruction if CODE is TRUE. Use
multi byte nop instructions if LONG_NOP is TRUE. */
static void *
bfd_arch_i386_fill (bfd_size_type count, bool code,
bool long_nop)
{
/* nop */
static const char nop_1[] = { 0x90 };
/* xchg %ax,%ax */
static const char nop_2[] = { 0x66, 0x90 };
/* nopl (%[re]ax) */
static const char nop_3[] = { 0x0f, 0x1f, 0x00 };
/* nopl 0(%[re]ax) */
static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 };
/* nopl 0(%[re]ax,%[re]ax,1) */
static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
/* nopw 0(%[re]ax,%[re]ax,1) */
static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 };
/* nopl 0L(%[re]ax) */
static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 };
/* nopl 0L(%[re]ax,%[re]ax,1) */
static const char nop_8[] =
{ 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00};
/* nopw 0L(%[re]ax,%[re]ax,1) */
static const char nop_9[] =
{ 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
/* nopw %cs:0L(%[re]ax,%[re]ax,1) */
static const char nop_10[] =
{ 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
static const char *const nops[] =
{ nop_1, nop_2, nop_3, nop_4, nop_5,
nop_6, nop_7, nop_8, nop_9, nop_10 };
bfd_size_type nop_size = long_nop ? ARRAY_SIZE (nops) : 2;
void *fill = bfd_malloc (count);
if (fill == NULL)
return fill;
if (code)
{
bfd_byte *p = fill;
while (count >= nop_size)
{
memcpy (p, nops[nop_size - 1], nop_size);
p += nop_size;
count -= nop_size;
}
if (count != 0)
memcpy (p, nops[count - 1], count);
}
else
memset (fill, 0, count);
return fill;
}
/* Fill the buffer with zero or short nop instruction if CODE is true. */
void *
bfd_arch_i386_short_nop_fill (bfd_size_type count,
bool is_bigendian ATTRIBUTE_UNUSED,
bool code)
{
return bfd_arch_i386_fill (count, code, false);
}
/* Fill the buffer with zero or long nop instruction if CODE is TRUE. */
static void *
bfd_arch_i386_long_nop_fill (bfd_size_type count,
bool is_bigendian ATTRIBUTE_UNUSED,
bool code)
{
return bfd_arch_i386_fill (count, code, true);
}
#define N(BITS, MACH, NAME, PRINT, DEF, FILL, NEXT) \
{ BITS, /* Bits in a word. */ \
BITS, /* Bits in an address. */ \
8, /* Bits in a byte. */ \
bfd_arch_i386, \
MACH, /* Machine number. */ \
NAME, \
PRINT, \
3, /* Section alignment power. */ \
DEF, /* Default architecture version ? */ \
bfd_i386_compatible, \
bfd_default_scan, \
FILL, \
NEXT, \
0 /* Maximum instruction length. */ \
}
static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax =
N (64, bfd_mach_x64_32_intel_syntax, "i386:intel", "i386:x64-32:intel",
false, bfd_arch_i386_long_nop_fill, NULL);
static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax =
N (64, bfd_mach_x86_64_intel_syntax, "i386:intel", "i386:x86-64:intel",
false, bfd_arch_i386_long_nop_fill, &bfd_x64_32_arch_intel_syntax);
static const bfd_arch_info_type bfd_i386_arch_intel_syntax =
N (32, bfd_mach_i386_i386_intel_syntax, "i386:intel", "i386:intel",
true, bfd_arch_i386_short_nop_fill, &bfd_x86_64_arch_intel_syntax);
static const bfd_arch_info_type i8086_arch =
N (32, bfd_mach_i386_i8086, "i8086", "i8086",
false, bfd_arch_i386_short_nop_fill, &bfd_i386_arch_intel_syntax);
static const bfd_arch_info_type bfd_x64_32_arch =
N (64, bfd_mach_x64_32, "i386", "i386:x64-32",
false, bfd_arch_i386_long_nop_fill, &i8086_arch);
static const bfd_arch_info_type bfd_x86_64_arch =
N (64, bfd_mach_x86_64, "i386", "i386:x86-64",
false, bfd_arch_i386_long_nop_fill, &bfd_x64_32_arch);
const bfd_arch_info_type bfd_i386_arch =
N (32, bfd_mach_i386_i386, "i386", "i386",
true, bfd_arch_i386_short_nop_fill, &bfd_x86_64_arch);
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