| 1 | /* BFD support for the Intel 386 architecture. |
| 2 | Copyright (C) 1992-2015 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of BFD, the Binary File Descriptor library. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "sysdep.h" |
| 22 | #include "bfd.h" |
| 23 | #include "libbfd.h" |
| 24 | #include "libiberty.h" |
| 25 | |
| 26 | extern void * bfd_arch_i386_short_nop_fill (bfd_size_type, bfd_boolean, |
| 27 | bfd_boolean); |
| 28 | |
| 29 | static const bfd_arch_info_type * |
| 30 | bfd_i386_compatible (const bfd_arch_info_type *a, |
| 31 | const bfd_arch_info_type *b) |
| 32 | { |
| 33 | const bfd_arch_info_type *compat = bfd_default_compatible (a, b); |
| 34 | |
| 35 | /* Don't allow mixing x64_32 with x86_64. */ |
| 36 | if (compat |
| 37 | && (a->mach & bfd_mach_x64_32) != (b->mach & bfd_mach_x64_32)) |
| 38 | compat = NULL; |
| 39 | |
| 40 | return compat; |
| 41 | } |
| 42 | |
| 43 | /* Fill the buffer with zero or nop instruction if CODE is TRUE. Use |
| 44 | multi byte nop instructions if LONG_NOP is TRUE. */ |
| 45 | |
| 46 | static void * |
| 47 | bfd_arch_i386_fill (bfd_size_type count, bfd_boolean code, |
| 48 | bfd_boolean long_nop) |
| 49 | { |
| 50 | /* nop */ |
| 51 | static const char nop_1[] = { 0x90 }; |
| 52 | /* xchg %ax,%ax */ |
| 53 | static const char nop_2[] = { 0x66, 0x90 }; |
| 54 | /* nopl (%[re]ax) */ |
| 55 | static const char nop_3[] = { 0x0f, 0x1f, 0x00 }; |
| 56 | /* nopl 0(%[re]ax) */ |
| 57 | static const char nop_4[] = { 0x0f, 0x1f, 0x40, 0x00 }; |
| 58 | /* nopl 0(%[re]ax,%[re]ax,1) */ |
| 59 | static const char nop_5[] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
| 60 | /* nopw 0(%[re]ax,%[re]ax,1) */ |
| 61 | static const char nop_6[] = { 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 }; |
| 62 | /* nopl 0L(%[re]ax) */ |
| 63 | static const char nop_7[] = { 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00 }; |
| 64 | /* nopl 0L(%[re]ax,%[re]ax,1) */ |
| 65 | static const char nop_8[] = |
| 66 | { 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00}; |
| 67 | /* nopw 0L(%[re]ax,%[re]ax,1) */ |
| 68 | static const char nop_9[] = |
| 69 | { 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
| 70 | /* nopw %cs:0L(%[re]ax,%[re]ax,1) */ |
| 71 | static const char nop_10[] = |
| 72 | { 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 }; |
| 73 | static const char *const nops[] = |
| 74 | { nop_1, nop_2, nop_3, nop_4, nop_5, |
| 75 | nop_6, nop_7, nop_8, nop_9, nop_10 }; |
| 76 | bfd_size_type nop_size = long_nop ? ARRAY_SIZE (nops) : 2; |
| 77 | |
| 78 | void *fill = bfd_malloc (count); |
| 79 | if (fill == NULL) |
| 80 | return fill; |
| 81 | |
| 82 | if (code) |
| 83 | { |
| 84 | bfd_byte *p = fill; |
| 85 | while (count >= nop_size) |
| 86 | { |
| 87 | memcpy (p, nops[nop_size - 1], nop_size); |
| 88 | p += nop_size; |
| 89 | count -= nop_size; |
| 90 | } |
| 91 | if (count != 0) |
| 92 | memcpy (p, nops[count - 1], count); |
| 93 | } |
| 94 | else |
| 95 | memset (fill, 0, count); |
| 96 | |
| 97 | return fill; |
| 98 | } |
| 99 | |
| 100 | /* Fill the buffer with zero or short nop instruction if CODE is TRUE. */ |
| 101 | |
| 102 | void * |
| 103 | bfd_arch_i386_short_nop_fill (bfd_size_type count, |
| 104 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
| 105 | bfd_boolean code) |
| 106 | { |
| 107 | return bfd_arch_i386_fill (count, code, FALSE); |
| 108 | } |
| 109 | |
| 110 | /* Fill the buffer with zero or long nop instruction if CODE is TRUE. */ |
| 111 | |
| 112 | static void * |
| 113 | bfd_arch_i386_long_nop_fill (bfd_size_type count, |
| 114 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
| 115 | bfd_boolean code) |
| 116 | { |
| 117 | return bfd_arch_i386_fill (count, code, TRUE); |
| 118 | } |
| 119 | |
| 120 | /* Fill the buffer with zero, or one-byte nop instructions if CODE is TRUE. */ |
| 121 | |
| 122 | static void * |
| 123 | bfd_arch_i386_onebyte_nop_fill (bfd_size_type count, |
| 124 | bfd_boolean is_bigendian ATTRIBUTE_UNUSED, |
| 125 | bfd_boolean code) |
| 126 | { |
| 127 | void *fill = bfd_malloc (count); |
| 128 | if (fill != NULL) |
| 129 | memset (fill, code ? 0x90 : 0, count); |
| 130 | return fill; |
| 131 | } |
| 132 | |
| 133 | |
| 134 | static const bfd_arch_info_type bfd_x64_32_nacl_arch = |
| 135 | { |
| 136 | 64, /* 64 bits in a word */ |
| 137 | 64, /* 64 bits in an address */ |
| 138 | 8, /* 8 bits in a byte */ |
| 139 | bfd_arch_i386, |
| 140 | bfd_mach_x64_32_nacl, |
| 141 | "i386", |
| 142 | "i386:x64-32:nacl", |
| 143 | 3, |
| 144 | FALSE, |
| 145 | bfd_i386_compatible, |
| 146 | bfd_default_scan, |
| 147 | bfd_arch_i386_onebyte_nop_fill, |
| 148 | NULL |
| 149 | }; |
| 150 | |
| 151 | static const bfd_arch_info_type bfd_x86_64_nacl_arch = |
| 152 | { |
| 153 | 64, /* 64 bits in a word */ |
| 154 | 64, /* 64 bits in an address */ |
| 155 | 8, /* 8 bits in a byte */ |
| 156 | bfd_arch_i386, |
| 157 | bfd_mach_x86_64_nacl, |
| 158 | "i386", |
| 159 | "i386:x86-64:nacl", |
| 160 | 3, |
| 161 | FALSE, |
| 162 | bfd_i386_compatible, |
| 163 | bfd_default_scan, |
| 164 | bfd_arch_i386_onebyte_nop_fill, |
| 165 | &bfd_x64_32_nacl_arch |
| 166 | }; |
| 167 | |
| 168 | const bfd_arch_info_type bfd_i386_nacl_arch = |
| 169 | { |
| 170 | 32, /* 32 bits in a word */ |
| 171 | 32, /* 32 bits in an address */ |
| 172 | 8, /* 8 bits in a byte */ |
| 173 | bfd_arch_i386, |
| 174 | bfd_mach_i386_i386_nacl, |
| 175 | "i386", |
| 176 | "i386:nacl", |
| 177 | 3, |
| 178 | TRUE, |
| 179 | bfd_i386_compatible, |
| 180 | bfd_default_scan, |
| 181 | bfd_arch_i386_onebyte_nop_fill, |
| 182 | &bfd_x86_64_nacl_arch |
| 183 | }; |
| 184 | |
| 185 | static const bfd_arch_info_type bfd_x64_32_arch_intel_syntax = |
| 186 | { |
| 187 | 64, /* 64 bits in a word */ |
| 188 | 64, /* 64 bits in an address */ |
| 189 | 8, /* 8 bits in a byte */ |
| 190 | bfd_arch_i386, |
| 191 | bfd_mach_x64_32_intel_syntax, |
| 192 | "i386:intel", |
| 193 | "i386:x64-32:intel", |
| 194 | 3, |
| 195 | FALSE, |
| 196 | bfd_i386_compatible, |
| 197 | bfd_default_scan, |
| 198 | bfd_arch_i386_long_nop_fill, |
| 199 | &bfd_i386_nacl_arch |
| 200 | }; |
| 201 | |
| 202 | static const bfd_arch_info_type bfd_x86_64_arch_intel_syntax = |
| 203 | { |
| 204 | 64, /* 64 bits in a word */ |
| 205 | 64, /* 64 bits in an address */ |
| 206 | 8, /* 8 bits in a byte */ |
| 207 | bfd_arch_i386, |
| 208 | bfd_mach_x86_64_intel_syntax, |
| 209 | "i386:intel", |
| 210 | "i386:x86-64:intel", |
| 211 | 3, |
| 212 | FALSE, |
| 213 | bfd_i386_compatible, |
| 214 | bfd_default_scan, |
| 215 | bfd_arch_i386_long_nop_fill, |
| 216 | &bfd_x64_32_arch_intel_syntax, |
| 217 | }; |
| 218 | |
| 219 | static const bfd_arch_info_type bfd_i386_arch_intel_syntax = |
| 220 | { |
| 221 | 32, /* 32 bits in a word */ |
| 222 | 32, /* 32 bits in an address */ |
| 223 | 8, /* 8 bits in a byte */ |
| 224 | bfd_arch_i386, |
| 225 | bfd_mach_i386_i386_intel_syntax, |
| 226 | "i386:intel", |
| 227 | "i386:intel", |
| 228 | 3, |
| 229 | TRUE, |
| 230 | bfd_i386_compatible, |
| 231 | bfd_default_scan, |
| 232 | bfd_arch_i386_short_nop_fill, |
| 233 | &bfd_x86_64_arch_intel_syntax |
| 234 | }; |
| 235 | |
| 236 | static const bfd_arch_info_type i8086_arch = |
| 237 | { |
| 238 | 32, /* 32 bits in a word */ |
| 239 | 32, /* 32 bits in an address (well, not really) */ |
| 240 | 8, /* 8 bits in a byte */ |
| 241 | bfd_arch_i386, |
| 242 | bfd_mach_i386_i8086, |
| 243 | "i8086", |
| 244 | "i8086", |
| 245 | 3, |
| 246 | FALSE, |
| 247 | bfd_i386_compatible, |
| 248 | bfd_default_scan, |
| 249 | bfd_arch_i386_short_nop_fill, |
| 250 | &bfd_i386_arch_intel_syntax |
| 251 | }; |
| 252 | |
| 253 | static const bfd_arch_info_type bfd_x64_32_arch = |
| 254 | { |
| 255 | 64, /* 64 bits in a word */ |
| 256 | 64, /* 64 bits in an address */ |
| 257 | 8, /* 8 bits in a byte */ |
| 258 | bfd_arch_i386, |
| 259 | bfd_mach_x64_32, |
| 260 | "i386", |
| 261 | "i386:x64-32", |
| 262 | 3, |
| 263 | FALSE, |
| 264 | bfd_i386_compatible, |
| 265 | bfd_default_scan, |
| 266 | bfd_arch_i386_long_nop_fill, |
| 267 | &i8086_arch |
| 268 | }; |
| 269 | |
| 270 | static const bfd_arch_info_type bfd_x86_64_arch = |
| 271 | { |
| 272 | 64, /* 64 bits in a word */ |
| 273 | 64, /* 64 bits in an address */ |
| 274 | 8, /* 8 bits in a byte */ |
| 275 | bfd_arch_i386, |
| 276 | bfd_mach_x86_64, |
| 277 | "i386", |
| 278 | "i386:x86-64", |
| 279 | 3, |
| 280 | FALSE, |
| 281 | bfd_i386_compatible, |
| 282 | bfd_default_scan, |
| 283 | bfd_arch_i386_long_nop_fill, |
| 284 | &bfd_x64_32_arch |
| 285 | }; |
| 286 | |
| 287 | const bfd_arch_info_type bfd_i386_arch = |
| 288 | { |
| 289 | 32, /* 32 bits in a word */ |
| 290 | 32, /* 32 bits in an address */ |
| 291 | 8, /* 8 bits in a byte */ |
| 292 | bfd_arch_i386, |
| 293 | bfd_mach_i386_i386, |
| 294 | "i386", |
| 295 | "i386", |
| 296 | 3, |
| 297 | TRUE, |
| 298 | bfd_i386_compatible, |
| 299 | bfd_default_scan, |
| 300 | bfd_arch_i386_short_nop_fill, |
| 301 | &bfd_x86_64_arch |
| 302 | }; |