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/* Capstone Disassembler Engine */
/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013-2019 */
#include <stdio.h>
#include <stdlib.h>
#include <capstone/platform.h>
#include <capstone/capstone.h>
struct platform {
cs_arch arch;
cs_mode mode;
unsigned char *code;
size_t size;
const char *comment;
cs_opt_type opt_type;
cs_opt_value opt_value;
cs_opt_type opt_skipdata;
size_t skipdata;
};
static void print_string_hex(unsigned char *str, size_t len)
{
unsigned char *c;
printf("Code: ");
for (c = str; c < str + len; c++) {
printf("0x%02x ", *c & 0xff);
}
printf("\n");
}
#ifdef CAPSTONE_HAS_ARM
static size_t CAPSTONE_API mycallback(const uint8_t *buffer, size_t buffer_size, size_t offset, void *p)
{
// always skip 2 bytes when encountering data
return 2;
}
#endif
static void test()
{
#ifdef CAPSTONE_HAS_X86
#define X86_CODE32 "\x8d\x4c\x32\x08\x01\xd8\x81\xc6\x34\x12\x00\x00\x00\x91\x92"
#endif
#define RANDOM_CODE "\xed\x00\x00\x00\x00\x1a\x5a\x0f\x1f\xff\xc2\x09\x80\x00\x00\x00\x07\xf7\xeb\x2a\xff\xff\x7f\x57\xe3\x01\xff\xff\x7f\x57\xeb\x00\xf0\x00\x00\x24\xb2\x4f\x00\x78"
#if defined(CAPSTONE_HAS_X86)
cs_opt_skipdata skipdata = {
// rename default "data" instruction from ".byte" to "db"
"db",
};
#endif
#ifdef CAPSTONE_HAS_ARM
cs_opt_skipdata skipdata_callback = {
"db",
&mycallback,
};
#endif
struct platform platforms[] = {
#ifdef CAPSTONE_HAS_X86
{
CS_ARCH_X86,
CS_MODE_32,
(unsigned char*)X86_CODE32,
sizeof(X86_CODE32) - 1,
"X86 32 (Intel syntax) - Skip data",
},
{
CS_ARCH_X86,
CS_MODE_32,
(unsigned char*)X86_CODE32,
sizeof(X86_CODE32) - 1,
"X86 32 (Intel syntax) - Skip data with custom mnemonic",
CS_OPT_INVALID,
CS_OPT_OFF,
CS_OPT_SKIPDATA_SETUP,
(size_t) &skipdata,
},
#endif
#ifdef CAPSTONE_HAS_ARM
{
CS_ARCH_ARM,
CS_MODE_ARM,
(unsigned char*)RANDOM_CODE,
sizeof(RANDOM_CODE) - 1,
"Arm - Skip data",
},
{
CS_ARCH_ARM,
CS_MODE_ARM,
(unsigned char*)RANDOM_CODE,
sizeof(RANDOM_CODE) - 1,
"Arm - Skip data with callback",
CS_OPT_INVALID,
CS_OPT_OFF,
CS_OPT_SKIPDATA_SETUP,
(size_t) &skipdata_callback,
},
#endif
};
csh handle;
uint64_t address = 0x1000;
cs_insn *insn;
cs_err err;
int i;
size_t count;
for (i = 0; i < sizeof(platforms)/sizeof(platforms[0]); i++) {
printf("****************\n");
printf("Platform: %s\n", platforms[i].comment);
err = cs_open(platforms[i].arch, platforms[i].mode, &handle);
if (err) {
printf("Failed on cs_open() with error returned: %u\n", err);
abort();
}
if (platforms[i].opt_type)
cs_option(handle, platforms[i].opt_type, platforms[i].opt_value);
// turn on SKIPDATA mode
cs_option(handle, CS_OPT_SKIPDATA, CS_OPT_ON);
cs_option(handle, platforms[i].opt_skipdata, platforms[i].skipdata);
count = cs_disasm(handle, platforms[i].code, platforms[i].size, address, 0, &insn);
if (count) {
size_t j;
print_string_hex(platforms[i].code, platforms[i].size);
printf("Disasm:\n");
for (j = 0; j < count; j++) {
printf("0x%" PRIx64 ":\t%s\t\t%s\n",
insn[j].address, insn[j].mnemonic, insn[j].op_str);
}
// print out the next offset, after the last insn
printf("0x%" PRIx64 ":\n", insn[j-1].address + insn[j-1].size);
// free memory allocated by cs_disasm()
cs_free(insn, count);
} else {
printf("****************\n");
printf("Platform: %s\n", platforms[i].comment);
print_string_hex(platforms[i].code, platforms[i].size);
printf("ERROR: Failed to disasm given code!\n");
abort();
}
printf("\n");
cs_close(&handle);
}
}
int main()
{
test();
#if 0
#define offsetof(st, m) __builtin_offsetof(st, m)
cs_insn insn;
printf("size: %lu\n", sizeof(insn));
printf("@id: %lu\n", offsetof(cs_insn, id));
printf("@address: %lu\n", offsetof(cs_insn, address));
printf("@size: %lu\n", offsetof(cs_insn, size));
printf("@bytes: %lu\n", offsetof(cs_insn, bytes));
printf("@mnemonic: %lu\n", offsetof(cs_insn, mnemonic));
printf("@op_str: %lu\n", offsetof(cs_insn, op_str));
printf("@regs_read: %lu\n", offsetof(cs_insn, regs_read));
printf("@regs_read_count: %lu\n", offsetof(cs_insn, regs_read_count));
printf("@regs_write: %lu\n", offsetof(cs_insn, regs_write));
printf("@regs_write_count: %lu\n", offsetof(cs_insn, regs_write_count));
printf("@groups: %lu\n", offsetof(cs_insn, groups));
printf("@groups_count: %lu\n", offsetof(cs_insn, groups_count));
printf("@arch: %lu\n", offsetof(cs_insn, x86));
#endif
return 0;
}
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