Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "disassembler_x86.h" |
| 18 | |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 19 | #include <iostream> |
| 20 | |
Elliott Hughes | 0f3c553 | 2012-03-30 14:51:51 -0700 | [diff] [blame] | 21 | #include "logging.h" |
| 22 | #include "stringprintf.h" |
| 23 | |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 24 | namespace art { |
| 25 | namespace x86 { |
| 26 | |
| 27 | DisassemblerX86::DisassemblerX86() { |
| 28 | } |
| 29 | |
| 30 | void DisassemblerX86::Dump(std::ostream& os, const uint8_t* begin, const uint8_t* end) { |
| 31 | size_t length = 0; |
| 32 | for (const uint8_t* cur = begin; cur < end; cur += length) { |
| 33 | length = DumpInstruction(os, cur); |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | static const char* gReg8Names[] = { "al", "cl", "dl", "bl", "ah", "ch", "dh", "bh" }; |
| 38 | static const char* gReg16Names[] = { "ax", "cx", "dx", "bx", "sp", "bp", "di", "si" }; |
| 39 | static const char* gReg32Names[] = { "eax", "ecx", "edx", "ebx", "esp", "ebp", "edi", "esi" }; |
| 40 | |
| 41 | static void DumpReg0(std::ostream& os, uint8_t /*rex*/, size_t reg, |
| 42 | bool byte_operand, uint8_t size_override) { |
| 43 | DCHECK_LT(reg, 8u); |
| 44 | // TODO: combine rex into size |
| 45 | size_t size = byte_operand ? 1 : (size_override == 0x66 ? 2 : 4); |
| 46 | switch (size) { |
| 47 | case 1: os << gReg8Names[reg]; break; |
| 48 | case 2: os << gReg16Names[reg]; break; |
| 49 | case 4: os << gReg32Names[reg]; break; |
| 50 | default: LOG(FATAL) << "unexpected size " << size; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | static void DumpReg(std::ostream& os, uint8_t rex, uint8_t reg, |
| 55 | bool byte_operand, uint8_t size_override) { |
| 56 | size_t reg_num = reg; // TODO: combine with REX.R on 64bit |
| 57 | DumpReg0(os, rex, reg_num, byte_operand, size_override); |
| 58 | } |
| 59 | |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 60 | static void DumpBaseReg(std::ostream& os, uint8_t rex, uint8_t reg) { |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 61 | size_t reg_num = reg; // TODO: combine with REX.B on 64bit |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 62 | DumpReg0(os, rex, reg_num, false, 0); |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 63 | } |
| 64 | |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 65 | static void DumpIndexReg(std::ostream& os, uint8_t rex, uint8_t reg) { |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 66 | int reg_num = reg; // TODO: combine with REX.X on 64bit |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 67 | DumpReg0(os, rex, reg_num, false, 0); |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | static void DumpSegmentOverride(std::ostream& os, uint8_t segment_prefix) { |
| 71 | switch (segment_prefix) { |
| 72 | case 0x2E: os << "cs:"; break; |
| 73 | case 0x36: os << "ss:"; break; |
| 74 | case 0x3E: os << "ds:"; break; |
| 75 | case 0x26: os << "es:"; break; |
| 76 | case 0x64: os << "fs:"; break; |
| 77 | case 0x65: os << "gs:"; break; |
| 78 | default: break; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | size_t DisassemblerX86::DumpInstruction(std::ostream& os, const uint8_t* instr) { |
| 83 | const uint8_t* begin_instr = instr; |
| 84 | bool have_prefixes = true; |
| 85 | uint8_t prefix[4] = {0, 0, 0, 0}; |
| 86 | const char** modrm_opcodes = NULL; |
| 87 | do { |
| 88 | switch (*instr) { |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 89 | // Group 1 - lock and repeat prefixes: |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 90 | case 0xF0: |
| 91 | case 0xF2: |
| 92 | case 0xF3: |
| 93 | prefix[0] = *instr; |
| 94 | break; |
| 95 | // Group 2 - segment override prefixes: |
| 96 | case 0x2E: |
| 97 | case 0x36: |
| 98 | case 0x3E: |
| 99 | case 0x26: |
| 100 | case 0x64: |
| 101 | case 0x65: |
| 102 | prefix[1] = *instr; |
| 103 | break; |
| 104 | // Group 3 - operand size override: |
| 105 | case 0x66: |
| 106 | prefix[2] = *instr; |
| 107 | break; |
| 108 | // Group 4 - address size override: |
| 109 | case 0x67: |
| 110 | prefix[3] = *instr; |
| 111 | break; |
| 112 | default: |
| 113 | have_prefixes = false; |
| 114 | break; |
| 115 | } |
| 116 | if (have_prefixes) { |
| 117 | instr++; |
| 118 | } |
| 119 | } while (have_prefixes); |
| 120 | uint8_t rex = (*instr >= 0x40 && *instr <= 0x4F) ? *instr : 0; |
| 121 | bool has_modrm = false; |
| 122 | bool reg_is_opcode = false; |
| 123 | size_t immediate_bytes = 0; |
| 124 | size_t branch_bytes = 0; |
| 125 | std::ostringstream opcode; |
| 126 | bool store = false; // stores to memory (ie rm is on the left) |
| 127 | bool load = false; // loads from memory (ie rm is on the right) |
| 128 | bool byte_operand = false; |
| 129 | bool ax = false; // implicit use of ax |
| 130 | bool reg_in_opcode = false; // low 3-bits of opcode encode register parameter |
| 131 | switch (*instr) { |
| 132 | #define DISASSEMBLER_ENTRY(opname, \ |
| 133 | rm8_r8, rm32_r32, \ |
| 134 | r8_rm8, r32_rm32, \ |
| 135 | ax8_i8, ax32_i32) \ |
| 136 | case rm8_r8: opcode << #opname; store = true; has_modrm = true; byte_operand = true; break; \ |
| 137 | case rm32_r32: opcode << #opname; store = true; has_modrm = true; break; \ |
| 138 | case r8_rm8: opcode << #opname; load = true; has_modrm = true; byte_operand = true; break; \ |
| 139 | case r32_rm32: opcode << #opname; load = true; has_modrm = true; break; \ |
| 140 | case ax8_i8: opcode << #opname; ax = true; immediate_bytes = 1; byte_operand = true; break; \ |
| 141 | case ax32_i32: opcode << #opname; ax = true; immediate_bytes = 4; break; |
| 142 | |
| 143 | DISASSEMBLER_ENTRY(add, |
| 144 | 0x00 /* RegMem8/Reg8 */, 0x01 /* RegMem32/Reg32 */, |
| 145 | 0x02 /* Reg8/RegMem8 */, 0x03 /* Reg32/RegMem32 */, |
| 146 | 0x04 /* Rax8/imm8 opcode */, 0x05 /* Rax32/imm32 */) |
| 147 | DISASSEMBLER_ENTRY(or, |
| 148 | 0x08 /* RegMem8/Reg8 */, 0x09 /* RegMem32/Reg32 */, |
| 149 | 0x0A /* Reg8/RegMem8 */, 0x0B /* Reg32/RegMem32 */, |
| 150 | 0x0C /* Rax8/imm8 opcode */, 0x0D /* Rax32/imm32 */) |
| 151 | DISASSEMBLER_ENTRY(adc, |
| 152 | 0x10 /* RegMem8/Reg8 */, 0x11 /* RegMem32/Reg32 */, |
| 153 | 0x12 /* Reg8/RegMem8 */, 0x13 /* Reg32/RegMem32 */, |
| 154 | 0x14 /* Rax8/imm8 opcode */, 0x15 /* Rax32/imm32 */) |
| 155 | DISASSEMBLER_ENTRY(sbb, |
| 156 | 0x18 /* RegMem8/Reg8 */, 0x19 /* RegMem32/Reg32 */, |
| 157 | 0x1A /* Reg8/RegMem8 */, 0x1B /* Reg32/RegMem32 */, |
| 158 | 0x1C /* Rax8/imm8 opcode */, 0x1D /* Rax32/imm32 */) |
| 159 | DISASSEMBLER_ENTRY(and, |
| 160 | 0x20 /* RegMem8/Reg8 */, 0x21 /* RegMem32/Reg32 */, |
| 161 | 0x22 /* Reg8/RegMem8 */, 0x23 /* Reg32/RegMem32 */, |
| 162 | 0x24 /* Rax8/imm8 opcode */, 0x25 /* Rax32/imm32 */) |
| 163 | DISASSEMBLER_ENTRY(sub, |
| 164 | 0x28 /* RegMem8/Reg8 */, 0x29 /* RegMem32/Reg32 */, |
| 165 | 0x2A /* Reg8/RegMem8 */, 0x2B /* Reg32/RegMem32 */, |
| 166 | 0x2C /* Rax8/imm8 opcode */, 0x2D /* Rax32/imm32 */) |
| 167 | DISASSEMBLER_ENTRY(xor, |
| 168 | 0x30 /* RegMem8/Reg8 */, 0x31 /* RegMem32/Reg32 */, |
| 169 | 0x32 /* Reg8/RegMem8 */, 0x33 /* Reg32/RegMem32 */, |
| 170 | 0x34 /* Rax8/imm8 opcode */, 0x35 /* Rax32/imm32 */) |
| 171 | DISASSEMBLER_ENTRY(cmp, |
| 172 | 0x38 /* RegMem8/Reg8 */, 0x39 /* RegMem32/Reg32 */, |
| 173 | 0x3A /* Reg8/RegMem8 */, 0x3B /* Reg32/RegMem32 */, |
| 174 | 0x3C /* Rax8/imm8 opcode */, 0x3D /* Rax32/imm32 */) |
| 175 | |
| 176 | #undef DISASSEMBLER_ENTRY |
| 177 | case 0x50: case 0x51: case 0x52: case 0x53: case 0x54: case 0x55: case 0x56: case 0x57: |
| 178 | opcode << "push"; |
| 179 | reg_in_opcode = true; |
| 180 | break; |
| 181 | case 0x58: case 0x59: case 0x5A: case 0x5B: case 0x5C: case 0x5D: case 0x5E: case 0x5F: |
| 182 | opcode << "pop"; |
| 183 | reg_in_opcode = true; |
| 184 | break; |
| 185 | case 0x68: opcode << "push"; immediate_bytes = 4; break; |
| 186 | case 0x6A: opcode << "push"; immediate_bytes = 1; break; |
| 187 | case 0x70: case 0x71: case 0x72: case 0x73: case 0x74: case 0x75: case 0x76: case 0x77: |
| 188 | case 0x78: case 0x79: case 0x7A: case 0x7B: case 0x7C: case 0x7D: case 0x7E: case 0x7F: |
| 189 | static const char* condition_codes[] = |
Elliott Hughes | b25c3f6 | 2012-03-26 16:35:06 -0700 | [diff] [blame] | 190 | {"o", "no", "b/nae/c", "nb/ae/nc", "z/eq", "nz/ne", "be/na", "nbe/a", |
| 191 | "s", "ns", "p/pe", "np/po", "l/nge", "nl/ge", "le/ng", "nle/g" |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 192 | }; |
| 193 | opcode << "j" << condition_codes[*instr & 0xF]; |
| 194 | branch_bytes = 1; |
| 195 | break; |
| 196 | case 0x88: opcode << "mov"; store = true; has_modrm = true; byte_operand = true; break; |
| 197 | case 0x89: opcode << "mov"; store = true; has_modrm = true; break; |
| 198 | case 0x8A: opcode << "mov"; load = true; has_modrm = true; byte_operand = true; break; |
| 199 | case 0x8B: opcode << "mov"; load = true; has_modrm = true; break; |
| 200 | |
| 201 | case 0x0F: // 2 byte extended opcode |
| 202 | instr++; |
| 203 | switch (*instr) { |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 204 | case 0x10: case 0x11: |
| 205 | if (prefix[0] == 0xF2) { |
| 206 | opcode << "movsd"; |
| 207 | } else if (prefix[0] == 0xF3) { |
| 208 | opcode << "movss"; |
| 209 | } else if (prefix[2] == 0x66) { |
| 210 | opcode << "movupd"; |
| 211 | } else { |
| 212 | opcode << "movups"; |
| 213 | } |
| 214 | has_modrm = true; |
| 215 | load = *instr == 0x10; |
| 216 | store = !load; |
| 217 | break; |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 218 | case 0x38: // 3 byte extended opcode |
| 219 | opcode << StringPrintf("unknown opcode '0F 38 %02X'", *instr); |
| 220 | break; |
| 221 | case 0x3A: // 3 byte extended opcode |
| 222 | opcode << StringPrintf("unknown opcode '0F 3A %02X'", *instr); |
| 223 | break; |
| 224 | case 0x80: case 0x81: case 0x82: case 0x83: case 0x84: case 0x85: case 0x86: case 0x87: |
| 225 | case 0x88: case 0x89: case 0x8A: case 0x8B: case 0x8C: case 0x8D: case 0x8E: case 0x8F: |
| 226 | opcode << "j" << condition_codes[*instr & 0xF]; |
| 227 | branch_bytes = 4; |
| 228 | break; |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 229 | case 0x90: case 0x91: case 0x92: case 0x93: case 0x94: case 0x95: case 0x96: case 0x97: |
| 230 | case 0x98: case 0x99: case 0x9A: case 0x9B: case 0x9C: case 0x9D: case 0x9E: case 0x9F: |
| 231 | opcode << "set" << condition_codes[*instr & 0xF]; |
| 232 | modrm_opcodes = NULL; |
| 233 | reg_is_opcode = true; |
| 234 | has_modrm = true; |
| 235 | store = true; |
| 236 | break; |
| 237 | case 0xB6: opcode << "movzxb"; has_modrm = true; load = true; break; |
| 238 | case 0xB7: opcode << "movzxw"; has_modrm = true; load = true; break; |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 239 | default: |
| 240 | opcode << StringPrintf("unknown opcode '0F %02X'", *instr); |
| 241 | break; |
| 242 | } |
| 243 | break; |
| 244 | case 0x80: case 0x81: case 0x82: case 0x83: |
| 245 | static const char* x80_opcodes[] = {"add", "or", "adc", "sbb", "and", "sub", "xor", "cmp"}; |
| 246 | modrm_opcodes = x80_opcodes; |
| 247 | has_modrm = true; |
| 248 | reg_is_opcode = true; |
| 249 | store = true; |
| 250 | byte_operand = (*instr & 1) == 0; |
| 251 | immediate_bytes = *instr == 0x81 ? 4 : 1; |
| 252 | break; |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 253 | case 0x8D: |
| 254 | opcode << "lea"; |
| 255 | has_modrm = true; |
| 256 | load = true; |
| 257 | break; |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 258 | case 0xB0: case 0xB1: case 0xB2: case 0xB3: case 0xB4: case 0xB5: case 0xB6: case 0xB7: |
| 259 | opcode << "mov"; |
| 260 | immediate_bytes = 1; |
| 261 | reg_in_opcode = true; |
| 262 | break; |
| 263 | case 0xB8: case 0xB9: case 0xBA: case 0xBB: case 0xBC: case 0xBD: case 0xBE: case 0xBF: |
| 264 | opcode << "mov"; |
| 265 | immediate_bytes = 4; |
| 266 | reg_in_opcode = true; |
| 267 | break; |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 268 | case 0xC0: case 0xC1: |
| 269 | static const char* shift_opcodes[] = |
| 270 | {"rol", "ror", "rcl", "rcr", "shl", "shr", "unknown-shift", "sar"}; |
| 271 | modrm_opcodes = shift_opcodes; |
| 272 | has_modrm = true; |
| 273 | reg_is_opcode = true; |
| 274 | store = true; |
| 275 | immediate_bytes = 1; |
| 276 | byte_operand = *instr == 0xC0; |
| 277 | break; |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 278 | case 0xC3: opcode << "ret"; break; |
Elliott Hughes | 0589ca9 | 2012-04-09 18:26:20 -0700 | [diff] [blame] | 279 | case 0xC7: |
| 280 | static const char* c7_opcodes[] = {"mov", "unknown-c7", "unknown-c7", "unknown-c7", "unknown-c7", "unknown-c7", "unknown-c7", "unknown-c7"}; |
| 281 | modrm_opcodes = c7_opcodes; |
| 282 | store = true; |
| 283 | immediate_bytes = 4; |
| 284 | has_modrm = true; |
| 285 | reg_is_opcode = true; |
| 286 | break; |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 287 | case 0xCC: opcode << "int 3"; break; |
| 288 | case 0xE8: opcode << "call"; branch_bytes = 4; break; |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 289 | case 0xE9: opcode << "jmp"; branch_bytes = 4; break; |
| 290 | case 0xEB: opcode << "jmp"; branch_bytes = 1; break; |
| 291 | case 0xFF: |
| 292 | static const char* ff_opcodes[] = {"inc", "dec", "call", "call", "jmp", "jmp", "push", "unknown-ff"}; |
| 293 | modrm_opcodes = ff_opcodes; |
| 294 | has_modrm = true; |
| 295 | reg_is_opcode = true; |
| 296 | load = true; |
| 297 | break; |
| 298 | default: |
| 299 | opcode << StringPrintf("unknown opcode '%02X'", *instr); |
| 300 | break; |
| 301 | } |
| 302 | std::ostringstream args; |
| 303 | if (reg_in_opcode) { |
| 304 | DCHECK(!has_modrm); |
| 305 | DumpReg(args, rex, *instr & 0x7, false, prefix[2]); |
| 306 | } |
| 307 | instr++; |
| 308 | if (has_modrm) { |
| 309 | uint8_t modrm = *instr; |
| 310 | instr++; |
| 311 | uint8_t mod = modrm >> 6; |
| 312 | uint8_t reg_or_opcode = (modrm >> 3) & 7; |
| 313 | uint8_t rm = modrm & 7; |
| 314 | std::ostringstream address; |
| 315 | if (mod == 0 && rm == 5) { // fixed address |
| 316 | address << StringPrintf("[0x%X]", *reinterpret_cast<const uint32_t*>(instr)); |
| 317 | instr += 4; |
| 318 | } else if (rm == 4 && mod != 3) { // SIB |
| 319 | uint8_t sib = *instr; |
| 320 | instr++; |
| 321 | uint8_t ss = (sib >> 6) & 3; |
| 322 | uint8_t index = (sib >> 3) & 7; |
| 323 | uint8_t base = sib & 7; |
| 324 | address << "["; |
| 325 | if (base != 5 || mod != 0) { |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 326 | DumpBaseReg(address, rex, base); |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 327 | if (index != 4) { |
| 328 | address << " + "; |
| 329 | } |
| 330 | } |
| 331 | if (index != 4) { |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 332 | DumpIndexReg(address, rex, index); |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 333 | if (ss != 0) { |
| 334 | address << StringPrintf(" * %d", 1 << ss); |
| 335 | } |
| 336 | } |
| 337 | if (mod == 1) { |
| 338 | address << StringPrintf(" + %d", *reinterpret_cast<const int8_t*>(instr)); |
| 339 | instr++; |
| 340 | } else if (mod == 2) { |
| 341 | address << StringPrintf(" + %d", *reinterpret_cast<const int32_t*>(instr)); |
| 342 | instr += 4; |
| 343 | } |
| 344 | address << "]"; |
| 345 | } else { |
| 346 | if (mod != 3) { |
| 347 | address << "["; |
| 348 | } |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 349 | DumpBaseReg(address, rex, rm); |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 350 | if (mod == 1) { |
| 351 | address << StringPrintf(" + %d", *reinterpret_cast<const int8_t*>(instr)); |
| 352 | instr++; |
| 353 | } else if (mod == 2) { |
| 354 | address << StringPrintf(" + %d", *reinterpret_cast<const int32_t*>(instr)); |
| 355 | instr += 4; |
| 356 | } |
| 357 | if (mod != 3) { |
| 358 | address << "]"; |
| 359 | } |
| 360 | } |
| 361 | |
Ian Rogers | 7caad77 | 2012-03-30 01:07:54 -0700 | [diff] [blame] | 362 | if (reg_is_opcode && modrm_opcodes != NULL) { |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 363 | opcode << modrm_opcodes[reg_or_opcode]; |
| 364 | } |
| 365 | if (load) { |
| 366 | if (!reg_is_opcode) { |
| 367 | DumpReg(args, rex, reg_or_opcode, byte_operand, prefix[2]); |
| 368 | args << ", "; |
| 369 | } |
| 370 | DumpSegmentOverride(args, prefix[1]); |
| 371 | args << address.str(); |
| 372 | } else { |
| 373 | DCHECK(store); |
| 374 | DumpSegmentOverride(args, prefix[1]); |
| 375 | args << address.str(); |
| 376 | if (!reg_is_opcode) { |
| 377 | args << ", "; |
| 378 | DumpReg(args, rex, reg_or_opcode, byte_operand, prefix[2]); |
| 379 | } |
| 380 | } |
| 381 | } |
| 382 | if (ax) { |
| 383 | DumpReg(args, rex, 0 /* EAX */, byte_operand, prefix[2]); |
| 384 | } |
| 385 | if (immediate_bytes > 0) { |
| 386 | if (has_modrm || reg_in_opcode || ax) { |
| 387 | args << ", "; |
| 388 | } |
| 389 | if (immediate_bytes == 1) { |
| 390 | args << StringPrintf("%d", *reinterpret_cast<const int8_t*>(instr)); |
| 391 | instr++; |
| 392 | } else { |
| 393 | CHECK_EQ(immediate_bytes, 4u); |
| 394 | args << StringPrintf("%d", *reinterpret_cast<const int32_t*>(instr)); |
| 395 | instr += 4; |
| 396 | } |
| 397 | } else if (branch_bytes > 0) { |
| 398 | DCHECK(!has_modrm); |
| 399 | int32_t displacement; |
| 400 | if (branch_bytes == 1) { |
| 401 | displacement = *reinterpret_cast<const int8_t*>(instr); |
| 402 | instr++; |
| 403 | } else { |
| 404 | CHECK_EQ(branch_bytes, 4u); |
| 405 | displacement = *reinterpret_cast<const int32_t*>(instr); |
| 406 | instr += 4; |
| 407 | } |
| 408 | args << StringPrintf("%d (%p)", displacement, instr + displacement); |
| 409 | } |
Elliott Hughes | 28fa76d | 2012-04-09 17:31:46 -0700 | [diff] [blame] | 410 | std::stringstream hex; |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 411 | for (size_t i = 0; begin_instr + i < instr; ++i) { |
Elliott Hughes | 28fa76d | 2012-04-09 17:31:46 -0700 | [diff] [blame] | 412 | hex << StringPrintf("%02X", begin_instr[i]); |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 413 | } |
Elliott Hughes | 28fa76d | 2012-04-09 17:31:46 -0700 | [diff] [blame] | 414 | os << StringPrintf("\t\t\t%p: %22s \t%-7s ", begin_instr, hex.str().c_str(), opcode.str().c_str()) << args.str() << '\n'; |
Ian Rogers | 706a10e | 2012-03-23 17:00:55 -0700 | [diff] [blame] | 415 | return instr - begin_instr; |
| 416 | } |
| 417 | |
| 418 | } // namespace x86 |
| 419 | } // namespace art |