1 /*************************************************************************************************** 2 3 Zyan Disassembler Library (Zydis) 4 5 Original Author : Joel Hoener 6 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in all 15 * copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 * SOFTWARE. 24 25 ***************************************************************************************************/ 26 27 #include <Zydis/Disassembler.h> 28 #include <Zycore/LibC.h> 29 30 /* ============================================================================================== */ 31 /* Internal helpers */ 32 /* ============================================================================================== */ 33 34 static ZyanStatus ZydisDisassemble(ZydisMachineMode machine_mode, 35 ZyanU64 runtime_address, const void* buffer, ZyanUSize length, 36 ZydisDisassembledInstruction *instruction, ZydisFormatterStyle style) 37 { 38 if (!buffer || !instruction) 39 { 40 return ZYAN_STATUS_INVALID_ARGUMENT; 41 } 42 43 *instruction = (ZydisDisassembledInstruction) 44 { 45 .runtime_address = runtime_address 46 }; 47 48 // Derive the stack width from the address width. 49 ZydisStackWidth stack_width; 50 switch (machine_mode) 51 { 52 case ZYDIS_MACHINE_MODE_LONG_64: 53 stack_width = ZYDIS_STACK_WIDTH_64; 54 break; 55 case ZYDIS_MACHINE_MODE_LONG_COMPAT_32: 56 case ZYDIS_MACHINE_MODE_LEGACY_32: 57 stack_width = ZYDIS_STACK_WIDTH_32; 58 break; 59 case ZYDIS_MACHINE_MODE_LONG_COMPAT_16: 60 case ZYDIS_MACHINE_MODE_LEGACY_16: 61 case ZYDIS_MACHINE_MODE_REAL_16: 62 stack_width = ZYDIS_STACK_WIDTH_16; 63 break; 64 default: 65 return ZYAN_STATUS_INVALID_ARGUMENT; 66 } 67 68 ZydisDecoder decoder; 69 ZYAN_CHECK(ZydisDecoderInit(&decoder, machine_mode, stack_width)); 70 71 ZydisDecoderContext ctx; 72 ZYAN_CHECK(ZydisDecoderDecodeInstruction(&decoder, &ctx, buffer, length, &instruction->info)); 73 ZYAN_CHECK(ZydisDecoderDecodeOperands(&decoder, &ctx, &instruction->info, 74 instruction->operands, instruction->info.operand_count)); 75 76 ZydisFormatter formatter; 77 ZYAN_CHECK(ZydisFormatterInit(&formatter, style)); 78 ZYAN_CHECK(ZydisFormatterFormatInstruction(&formatter, &instruction->info, 79 instruction->operands, instruction->info.operand_count_visible, instruction->text, 80 sizeof(instruction->text), runtime_address, ZYAN_NULL)); 81 82 return ZYAN_STATUS_SUCCESS; 83 } 84 85 /* ============================================================================================== */ 86 /* Public functions */ 87 /* ============================================================================================== */ 88 89 ZyanStatus ZydisDisassembleIntel(ZydisMachineMode machine_mode, 90 ZyanU64 runtime_address, const void* buffer, ZyanUSize length, 91 ZydisDisassembledInstruction *instruction) 92 { 93 return ZydisDisassemble(machine_mode, runtime_address, buffer, length, instruction, 94 ZYDIS_FORMATTER_STYLE_INTEL); 95 } 96 97 ZyanStatus ZydisDisassembleATT(ZydisMachineMode machine_mode, 98 ZyanU64 runtime_address, const void* buffer, ZyanUSize length, 99 ZydisDisassembledInstruction *instruction) 100 { 101 return ZydisDisassemble(machine_mode, runtime_address, buffer, length, instruction, 102 ZYDIS_FORMATTER_STYLE_ATT); 103 } 104 105 /* ============================================================================================== */ 106