/* BFD support for the Intel 386 architecture.
- Copyright 1992, 1994, 1995, 1996, 1998, 2000, 2001, 2002, 2004
- Free Software Foundation, Inc.
+ Copyright (C) 1992-2024 Free Software Foundation, Inc.
-This file is part of BFD, the Binary File Descriptor library.
+ 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 2 of the License, or
-(at your option) any later version.
+ 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.
+ 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. */
+ 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 "bfd.h"
#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);
-const bfd_arch_info_type bfd_x86_64_arch_intel_syntax =
+static const bfd_arch_info_type *
+bfd_i386_compatible (const bfd_arch_info_type *a,
+ const bfd_arch_info_type *b)
{
- 64, /* 64 bits in a word */
- 64, /* 64 bits in an address */
- 8, /* 8 bits in a byte */
- bfd_arch_i386,
- bfd_mach_x86_64_intel_syntax,
- "i386:intel",
- "i386:x86-64:intel",
- 3,
- FALSE,
- bfd_default_compatible,
- bfd_default_scan,
- 0
-};
-
-const bfd_arch_info_type bfd_i386_arch_intel_syntax =
+ 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)
{
- 32, /* 32 bits in a word */
- 32, /* 32 bits in an address */
- 8, /* 8 bits in a byte */
- bfd_arch_i386,
- bfd_mach_i386_i386_intel_syntax,
- "i386:intel",
- "i386:intel",
- 3,
- TRUE,
- bfd_default_compatible,
- bfd_default_scan,
- &bfd_x86_64_arch_intel_syntax
-};
-
-const bfd_arch_info_type i8086_arch =
+ /* 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)
{
- 32, /* 32 bits in a word */
- 32, /* 32 bits in an address (well, not really) */
- 8, /* 8 bits in a byte */
- bfd_arch_i386,
- bfd_mach_i386_i8086,
- "i8086",
- "i8086",
- 3,
- FALSE,
- bfd_default_compatible,
- bfd_default_scan,
- &bfd_i386_arch_intel_syntax
-};
-
-const bfd_arch_info_type bfd_x86_64_arch =
+ 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)
{
- 64, /* 32 bits in a word */
- 64, /* 32 bits in an address */
- 8, /* 8 bits in a byte */
- bfd_arch_i386,
- bfd_mach_x86_64,
- "i386",
- "i386:x86-64",
- 3,
- FALSE,
- bfd_default_compatible,
- bfd_default_scan,
- &i8086_arch
-};
+ 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 =
-{
- 32, /* 32 bits in a word */
- 32, /* 32 bits in an address */
- 8, /* 8 bits in a byte */
- bfd_arch_i386,
- bfd_mach_i386_i386,
- "i386",
- "i386",
- 3,
- TRUE,
- bfd_default_compatible,
- bfd_default_scan,
- &bfd_x86_64_arch
-};
+ N (32, bfd_mach_i386_i386, "i386", "i386",
+ true, bfd_arch_i386_short_nop_fill, &bfd_x86_64_arch);
projects / thirdparty / binutils-gdb.git / blobdiff