zydis/tools/ZydisDisasm.c

142 lines
5.1 KiB
C

/***************************************************************************************************
Zyan Disassembler Engine (Zydis)
Original Author : Florian Bernd, Joel Höner
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
***************************************************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <Zydis/Zydis.h>
#include "Zydis/Encoder.h"
/* ============================================================================================== */
/* Entry point */
/* ============================================================================================== */
int main(int argc, char** argv)
{
if (argc < 1 || argc > 2)
{
fprintf(stderr, "Usage: %s [input file]\n", (argc > 0 ? argv[0] : "ZydisDisasm"));
return EXIT_FAILURE;
}
FILE* file = argc >= 2 ? fopen(argv[1], "rb") : stdin;
if (!file)
{
fprintf(stderr, "Can not open file: %s\n", strerror(errno));
return EXIT_FAILURE;
}
ZydisDecoder decoder;
if (!ZYDIS_SUCCESS(
ZydisDecoderInit(&decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_ADDRESS_WIDTH_64)))
{
fputs("Failed to initialize decoder\n", stderr);
return EXIT_FAILURE;
}
ZydisFormatter formatter;
if (!ZYDIS_SUCCESS(ZydisFormatterInitEx(&formatter, ZYDIS_FORMATTER_STYLE_INTEL,
ZYDIS_FMTFLAG_FORCE_SEGMENTS | ZYDIS_FMTFLAG_FORCE_OPERANDSIZE,
ZYDIS_FORMATTER_ADDR_ABSOLUTE, ZYDIS_FORMATTER_DISP_DEFAULT, ZYDIS_FORMATTER_IMM_DEFAULT)))
{
fputs("Failed to initialized instruction-formatter\n", stderr);
return EXIT_FAILURE;
}
uint8_t readBuf[ZYDIS_MAX_INSTRUCTION_LENGTH * 1024];
size_t numBytesRead;
do
{
numBytesRead = fread(readBuf, 1, sizeof(readBuf), file);
ZydisDecodedInstruction instruction;
ZydisStatus status;
size_t readOffs = 0;
while ((status = ZydisDecoderDecodeBuffer(&decoder, readBuf + readOffs,
numBytesRead - readOffs, readOffs, &instruction)) != ZYDIS_STATUS_NO_MORE_DATA)
{
if (!ZYDIS_SUCCESS(status))
{
++readOffs;
printf("db %02X\n", instruction.data[0]);
continue;
}
char printBuffer[256];
ZydisFormatterFormatInstruction(
&formatter, &instruction, printBuffer, sizeof(printBuffer));
puts(printBuffer);
// TODO: Remove
// DEBUG CODE START
#if 0
for (size_t i = 0; i < instruction.length; ++i)
{
printf("%02X ", *(readBuf + readOffs + i));
}
putchar('\n');
ZydisEncoderRequest req;
ZydisStatus transStatus = ZydisEncoderDecodedInstructionToRequest(
&instruction, &req
);
(void)transStatus;
ZYDIS_ASSERT(ZYDIS_SUCCESS(transStatus));
uint8_t encBuffer[15];
size_t encBufferSize = sizeof(encBuffer);
ZydisStatus encStatus = ZydisEncoderEncodeInstruction(
encBuffer, &encBufferSize, &req
);
(void)encStatus;
ZYDIS_ASSERT(ZYDIS_SUCCESS(encStatus));
for (size_t i = 0; i < encBufferSize; ++i)
{
printf("%02X ", encBuffer[i]);
}
putchar('\n');
ZYDIS_ASSERT(encBufferSize == instruction.length);
ZYDIS_ASSERT(!memcmp(encBuffer, readBuf + readOffs, encBufferSize));
#endif
// DEBUG CODE END
readOffs += instruction.length;
}
if (readOffs < sizeof(readBuf))
{
memmove(readBuf, readBuf + readOffs, sizeof(readBuf) - readOffs);
}
} while (numBytesRead == sizeof(readBuf));
return 0;
}
/* ============================================================================================== */