| 1 | /* BFD support for the Intel 386 architecture. |
| 2 | Copyright 1992, 1994, 1995, 1996, 1998, 2000, 2001, 2002, 2004, 2005, |
| 3 | 2007, 2009, 2010, 2011 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "sysdep.h" |
| 24 | #include "bfd.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "libiberty.h" |
| 27 | |
| 28 | extern void * bfd_arch_i386_short_nop_fill (bfd_size_type, bfd_boolean, |
| 29 | bfd_boolean); |
| 30 | |
| 31 | static const bfd_arch_info_type * |
| 32 | bfd_i386_compatible (const bfd_arch_info_type *a, |
| 33 | const bfd_arch_info_type *b) |
| 34 | { |
| 35 | const bfd_arch_info_type *compat = bfd_default_compatible (a, b); |
| 36 | |
| 37 | /* Don't allow mixing x64_32 with x86_64. */ |
| 38 | if (compat |
| 39 | && (a->mach & bfd_mach_x64_32) != (b->mach & bfd_mach_x64_32)) |
| 40 | compat = NULL; |
| 41 | |
| 42 | return compat; |
| 43 | } |
| 44 | |
| 45 | /* Fill the buffer with zero or nop instruction if CODE is TRUE. Use |
| 46 | multi byte nop instructions if LONG_NOP is TRUE. */ |
| 47 | |
| 48 | static void * |
| 49 | bfd_arch_i386_fill (bfd_size_type count, bfd_boolean code, |
| 50 | bfd_boolean long_nop) |
| 51 | { |
| 52 | /* nop */ |
| 53 | static const char nop_1[] = { 0x90 }; |
| 54 | /* xchg %ax,%ax */ |
| 55 | static const char nop_2[] = { 0x66, 0x90 }; |
| 56 | /* nopl (%[re]ax) */ |
| 57 | static const char nop_3[] = { 0x0f, 0x1f, 0x00 }; |
| 58 | /* nopl 0(%[re]ax) */ |
| 59 | static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 }; |
| 60 | /* nopl 0(%[re]ax,%[re]ax,1) */ |
| 61 | static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
| 62 | /* nopw 0(%[re]ax,%[re]ax,1) */ |
| 63 | static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
| 64 | /* nopl 0L(%[re]ax) */ |
| 65 | static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 }; |
| 66 | /* nopl 0L(%[re]ax,%[re]ax,1) */ |
| 67 | static const char nop_8[] = |
| 68 | { 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00}; |
| 69 | /* nopw 0L(%[re]ax,%[re]ax,1) */ |
| 70 | static const char nop_9[] = |
| 71 | { 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
| 72 | /* nopw %cs:0L(%[re]ax,%[re]ax,1) */ |
| 73 | static const char nop_10[] = |
| 74 | { 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
| 75 | static const char *const nops[] = |
| 76 | { nop_1, nop_2, nop_3, nop_4, nop_5, |
| 77 | nop_6, nop_7, nop_8, nop_9, nop_10 }; |
| 78 | bfd_size_type nop_size = long_nop ? ARRAY_SIZE (nops) : 2; |
| 79 | |
| 80 | void *fill = bfd_malloc (count); |
| 81 | if (fill == NULL) |
| 82 | return fill; |
| 83 | |
| 84 | if (code) |
| 85 | { |
| 86 | bfd_byte *p = fill; |
| 87 | while (count >= nop_size) |
| 88 | { |
| 89 | memcpy (p, nops[nop_size - 1], nop_size); |
| 90 | p += nop_size; |
| 91 | count -= nop_size; |
| 92 | } |
| 93 | if (count != 0) |
| 94 | memcpy (p, nops[count - 1], count); |
| 95 | } |
| 96 | else |
| 97 | memset (fill, 0, count); |
| 98 | |
| 99 | return fill; |
| 100 | } |
| 101 | |
| 102 | /* Fill the buffer with zero or short nop instruction if CODE is TRUE. */ |
| 103 | |
| 104 | void * |
| 105 | bfd_arch_i386_short_nop_fill (bfd_size_type count, |
| 106 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
| 107 | bfd_boolean code) |
| 108 | { |
| 109 | return bfd_arch_i386_fill (count, code, FALSE); |
| 110 | } |
| 111 | |
| 112 | /* Fill the buffer with zero or long nop instruction if CODE is TRUE. */ |
| 113 | |
| 114 | static void * |
| 115 | bfd_arch_i386_long_nop_fill (bfd_size_type count, |
| 116 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
| 117 | bfd_boolean code) |
| 118 | { |
| 119 | return bfd_arch_i386_fill (count, code, TRUE); |
| 120 | } |
| 121 | |
| 122 | static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax = |
| 123 | { |
| 124 | 64, /* 64 bits in a word */ |
| 125 | 64, /* 64 bits in an address */ |
| 126 | 8, /* 8 bits in a byte */ |
| 127 | bfd_arch_i386, |
| 128 | bfd_mach_x64_32_intel_syntax, |
| 129 | "i386:intel", |
| 130 | "i386:x64-32:intel", |
| 131 | 3, |
| 132 | FALSE, |
| 133 | bfd_i386_compatible, |
| 134 | bfd_default_scan, |
| 135 | bfd_arch_i386_long_nop_fill, |
| 136 | 0 |
| 137 | }; |
| 138 | |
| 139 | static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax = |
| 140 | { |
| 141 | 64, /* 64 bits in a word */ |
| 142 | 64, /* 64 bits in an address */ |
| 143 | 8, /* 8 bits in a byte */ |
| 144 | bfd_arch_i386, |
| 145 | bfd_mach_x86_64_intel_syntax, |
| 146 | "i386:intel", |
| 147 | "i386:x86-64:intel", |
| 148 | 3, |
| 149 | FALSE, |
| 150 | bfd_i386_compatible, |
| 151 | bfd_default_scan, |
| 152 | bfd_arch_i386_long_nop_fill, |
| 153 | &bfd_x64_32_arch_intel_syntax, |
| 154 | }; |
| 155 | |
| 156 | static const bfd_arch_info_type bfd_i386_arch_intel_syntax = |
| 157 | { |
| 158 | 32, /* 32 bits in a word */ |
| 159 | 32, /* 32 bits in an address */ |
| 160 | 8, /* 8 bits in a byte */ |
| 161 | bfd_arch_i386, |
| 162 | bfd_mach_i386_i386_intel_syntax, |
| 163 | "i386:intel", |
| 164 | "i386:intel", |
| 165 | 3, |
| 166 | TRUE, |
| 167 | bfd_i386_compatible, |
| 168 | bfd_default_scan, |
| 169 | bfd_arch_i386_short_nop_fill, |
| 170 | &bfd_x86_64_arch_intel_syntax |
| 171 | }; |
| 172 | |
| 173 | static const bfd_arch_info_type i8086_arch = |
| 174 | { |
| 175 | 32, /* 32 bits in a word */ |
| 176 | 32, /* 32 bits in an address (well, not really) */ |
| 177 | 8, /* 8 bits in a byte */ |
| 178 | bfd_arch_i386, |
| 179 | bfd_mach_i386_i8086, |
| 180 | "i8086", |
| 181 | "i8086", |
| 182 | 3, |
| 183 | FALSE, |
| 184 | bfd_i386_compatible, |
| 185 | bfd_default_scan, |
| 186 | bfd_arch_i386_short_nop_fill, |
| 187 | &bfd_i386_arch_intel_syntax |
| 188 | }; |
| 189 | |
| 190 | static const bfd_arch_info_type bfd_x64_32_arch = |
| 191 | { |
| 192 | 64, /* 64 bits in a word */ |
| 193 | 64, /* 64 bits in an address */ |
| 194 | 8, /* 8 bits in a byte */ |
| 195 | bfd_arch_i386, |
| 196 | bfd_mach_x64_32, |
| 197 | "i386", |
| 198 | "i386:x64-32", |
| 199 | 3, |
| 200 | FALSE, |
| 201 | bfd_i386_compatible, |
| 202 | bfd_default_scan, |
| 203 | bfd_arch_i386_long_nop_fill, |
| 204 | &i8086_arch |
| 205 | }; |
| 206 | |
| 207 | static const bfd_arch_info_type bfd_x86_64_arch = |
| 208 | { |
| 209 | 64, /* 64 bits in a word */ |
| 210 | 64, /* 64 bits in an address */ |
| 211 | 8, /* 8 bits in a byte */ |
| 212 | bfd_arch_i386, |
| 213 | bfd_mach_x86_64, |
| 214 | "i386", |
| 215 | "i386:x86-64", |
| 216 | 3, |
| 217 | FALSE, |
| 218 | bfd_i386_compatible, |
| 219 | bfd_default_scan, |
| 220 | bfd_arch_i386_long_nop_fill, |
| 221 | &bfd_x64_32_arch |
| 222 | }; |
| 223 | |
| 224 | const bfd_arch_info_type bfd_i386_arch = |
| 225 | { |
| 226 | 32, /* 32 bits in a word */ |
| 227 | 32, /* 32 bits in an address */ |
| 228 | 8, /* 8 bits in a byte */ |
| 229 | bfd_arch_i386, |
| 230 | bfd_mach_i386_i386, |
| 231 | "i386", |
| 232 | "i386", |
| 233 | 3, |
| 234 | TRUE, |
| 235 | bfd_i386_compatible, |
| 236 | bfd_default_scan, |
| 237 | bfd_arch_i386_short_nop_fill, |
| 238 | &bfd_x86_64_arch |
| 239 | }; |