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87 lines
2.1 KiB
87 lines
2.1 KiB
/* Capstone Disassembly Engine */
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/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2015 */
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// This sample code demonstrates the option CS_OPT_MNEMONIC
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// to customize instruction mnemonic.
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#include <stdio.h>
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#include <stdlib.h>
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#include <capstone/platform.h>
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#include <capstone/capstone.h>
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#define X86_CODE32 "\x75\x01"
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// Print out the input code in hexadecimal format
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static void print_string_hex(unsigned char *str, size_t len)
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{
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unsigned char *c;
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for (c = str; c < str + len; c++) {
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printf("%02x ", *c & 0xff);
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}
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printf("\t");
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}
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// Print one instruction
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static void print_insn(csh handle)
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{
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cs_insn *insn;
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size_t count;
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count = cs_disasm(handle, (const uint8_t *)X86_CODE32, sizeof(X86_CODE32) - 1, 0x1000, 1, &insn);
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if (count) {
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print_string_hex((unsigned char *)X86_CODE32, sizeof(X86_CODE32) - 1);
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printf("\t%s\t%s\n", insn[0].mnemonic, insn[0].op_str);
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// Free memory allocated by cs_disasm()
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cs_free(insn, count);
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} else {
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printf("ERROR: Failed to disasm given code!\n");
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abort();
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}
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}
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static void test()
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{
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csh handle;
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cs_err err;
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// Customize mnemonic JNE to "jnz"
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cs_opt_mnem my_mnem = { X86_INS_JNE, "jnz" };
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// Set .mnemonic to NULL to reset to default mnemonic
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cs_opt_mnem default_mnem = { X86_INS_JNE, NULL };
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err = cs_open(CS_ARCH_X86, CS_MODE_32, &handle);
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if (err) {
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printf("Failed on cs_open() with error returned: %u\n", err);
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abort();
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}
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// 1. Print out the instruction in default setup.
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printf("Disassemble X86 code with default instruction mnemonic\n");
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print_insn(handle);
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// Customized mnemonic JNE to JNZ using CS_OPT_MNEMONIC option
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printf("\nNow customize engine to change mnemonic from 'JNE' to 'JNZ'\n");
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cs_option(handle, CS_OPT_MNEMONIC, (size_t)&my_mnem);
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// 2. Now print out the instruction in newly customized setup.
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print_insn(handle);
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// Reset engine to use the default mnemonic of JNE
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printf("\nReset engine to use the default mnemonic\n");
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cs_option(handle, CS_OPT_MNEMONIC, (size_t)&default_mnem);
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// 3. Now print out the instruction in default setup.
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print_insn(handle);
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// Done
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cs_close(&handle);
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}
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int main()
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{
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test();
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return 0;
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}
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