165 lines
5.2 KiB
C
165 lines
5.2 KiB
C
/* BFD support for the Intel 386 architecture.
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Copyright (C) 1992-2022 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "libiberty.h"
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extern void * bfd_arch_i386_short_nop_fill (bfd_size_type, bool,
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bool);
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static const bfd_arch_info_type *
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bfd_i386_compatible (const bfd_arch_info_type *a,
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const bfd_arch_info_type *b)
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{
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const bfd_arch_info_type *compat = bfd_default_compatible (a, b);
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/* Don't allow mixing x64_32 with x86_64. */
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if (compat
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&& (a->mach & bfd_mach_x64_32) != (b->mach & bfd_mach_x64_32))
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compat = NULL;
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return compat;
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}
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/* Fill the buffer with zero or nop instruction if CODE is TRUE. Use
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multi byte nop instructions if LONG_NOP is TRUE. */
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static void *
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bfd_arch_i386_fill (bfd_size_type count, bool code,
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bool long_nop)
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{
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/* nop */
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static const char nop_1[] = { 0x90 };
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/* xchg %ax,%ax */
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static const char nop_2[] = { 0x66, 0x90 };
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/* nopl (%[re]ax) */
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static const char nop_3[] = { 0x0f, 0x1f, 0x00 };
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/* nopl 0(%[re]ax) */
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static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 };
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/* nopl 0(%[re]ax,%[re]ax,1) */
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static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
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/* nopw 0(%[re]ax,%[re]ax,1) */
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static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 };
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/* nopl 0L(%[re]ax) */
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static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 };
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/* nopl 0L(%[re]ax,%[re]ax,1) */
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static const char nop_8[] =
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{ 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00};
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/* nopw 0L(%[re]ax,%[re]ax,1) */
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static const char nop_9[] =
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{ 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
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/* nopw %cs:0L(%[re]ax,%[re]ax,1) */
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static const char nop_10[] =
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{ 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 };
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static const char *const nops[] =
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{ nop_1, nop_2, nop_3, nop_4, nop_5,
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nop_6, nop_7, nop_8, nop_9, nop_10 };
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bfd_size_type nop_size = long_nop ? ARRAY_SIZE (nops) : 2;
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void *fill = bfd_malloc (count);
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if (fill == NULL)
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return fill;
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if (code)
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{
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bfd_byte *p = fill;
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while (count >= nop_size)
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{
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memcpy (p, nops[nop_size - 1], nop_size);
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p += nop_size;
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count -= nop_size;
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}
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if (count != 0)
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memcpy (p, nops[count - 1], count);
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}
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else
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memset (fill, 0, count);
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return fill;
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}
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/* Fill the buffer with zero or short nop instruction if CODE is true. */
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void *
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bfd_arch_i386_short_nop_fill (bfd_size_type count,
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bool is_bigendian ATTRIBUTE_UNUSED,
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bool code)
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{
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return bfd_arch_i386_fill (count, code, false);
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}
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/* Fill the buffer with zero or long nop instruction if CODE is TRUE. */
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static void *
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bfd_arch_i386_long_nop_fill (bfd_size_type count,
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bool is_bigendian ATTRIBUTE_UNUSED,
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bool code)
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{
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return bfd_arch_i386_fill (count, code, true);
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}
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#define N(BITS, MACH, NAME, PRINT, DEF, FILL, NEXT) \
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{ BITS, /* Bits in a word. */ \
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BITS, /* Bits in an address. */ \
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8, /* Bits in a byte. */ \
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bfd_arch_i386, \
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MACH, /* Machine number. */ \
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NAME, \
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PRINT, \
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3, /* Section alignment power. */ \
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DEF, /* Default architecture version ? */ \
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bfd_i386_compatible, \
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bfd_default_scan, \
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FILL, \
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NEXT, \
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0 /* Maximum instruction length. */ \
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}
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static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax =
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N (64, bfd_mach_x64_32_intel_syntax, "i386:intel", "i386:x64-32:intel",
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false, bfd_arch_i386_long_nop_fill, NULL);
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static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax =
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N (64, bfd_mach_x86_64_intel_syntax, "i386:intel", "i386:x86-64:intel",
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false, bfd_arch_i386_long_nop_fill, &bfd_x64_32_arch_intel_syntax);
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static const bfd_arch_info_type bfd_i386_arch_intel_syntax =
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N (32, bfd_mach_i386_i386_intel_syntax, "i386:intel", "i386:intel",
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true, bfd_arch_i386_short_nop_fill, &bfd_x86_64_arch_intel_syntax);
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static const bfd_arch_info_type i8086_arch =
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N (32, bfd_mach_i386_i8086, "i8086", "i8086",
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false, bfd_arch_i386_short_nop_fill, &bfd_i386_arch_intel_syntax);
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static const bfd_arch_info_type bfd_x64_32_arch =
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N (64, bfd_mach_x64_32, "i386", "i386:x64-32",
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false, bfd_arch_i386_long_nop_fill, &i8086_arch);
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static const bfd_arch_info_type bfd_x86_64_arch =
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N (64, bfd_mach_x86_64, "i386", "i386:x86-64",
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false, bfd_arch_i386_long_nop_fill, &bfd_x64_32_arch);
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const bfd_arch_info_type bfd_i386_arch =
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N (32, bfd_mach_i386_i386, "i386", "i386",
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true, bfd_arch_i386_short_nop_fill, &bfd_x86_64_arch);
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