duckstation

duckstation, but archived from the revision just before upstream changed it to a proprietary software project, this version is the libre one
git clone https://git.neptards.moe/u3shit/duckstation.git
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Disassembler.c (4461B)

      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 /* ============================================================================================== */