You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
213 lines
6.3 KiB
213 lines
6.3 KiB
/* Second-Best Disassembler Engine */ |
|
/* By Nguyen Anh Quynh <aquynh@gmail.com>, 2013> */ |
|
|
|
#include <stdio.h> |
|
#include <stdlib.h> |
|
#include <inttypes.h> |
|
|
|
#include <capstone.h> |
|
|
|
static csh handle; |
|
|
|
struct platform { |
|
cs_arch arch; |
|
cs_mode mode; |
|
unsigned char *code; |
|
size_t size; |
|
char *comment; |
|
cs_opt_type opt_type; |
|
cs_opt_value opt_value; |
|
}; |
|
|
|
static void print_string_hex(char *comment, unsigned char *str, int len) |
|
{ |
|
unsigned char *c; |
|
|
|
printf("%s", comment); |
|
for (c = str; c < str + len; c++) { |
|
printf("0x%02x ", *c & 0xff); |
|
} |
|
|
|
printf("\n"); |
|
} |
|
|
|
static void print_insn_detail(csh ud, cs_mode mode, cs_insn *ins) |
|
{ |
|
int i; |
|
cs_x86 *x86 = &(ins->detail->x86); |
|
|
|
print_string_hex("\tPrefix:", x86->prefix, 5); |
|
|
|
if (x86->segment != X86_REG_INVALID) |
|
printf("\tSegment override: %s\n", cs_reg_name(handle, x86->segment)); |
|
|
|
print_string_hex("\tOpcode:", x86->opcode, 3); |
|
printf("\top_size: %u, addr_size: %u, disp_size: %u, imm_size: %u\n", x86->op_size, x86->addr_size, x86->disp_size, x86->imm_size); |
|
printf("\tmodrm: 0x%x\n", x86->modrm); |
|
printf("\tdisp: 0x%x\n", x86->disp); |
|
|
|
// SIB is not available in 16-bit mode |
|
if ((mode & CS_MODE_16) == 0) { |
|
printf("\tsib: 0x%x\n", x86->sib); |
|
if (x86->sib_index != X86_REG_INVALID) |
|
printf("\tsib_index: %s, sib_scale: %u, sib_base: %s\n", |
|
cs_reg_name(handle, x86->sib_index), |
|
x86->sib_scale, |
|
cs_reg_name(handle, x86->sib_base)); |
|
} |
|
|
|
int count = cs_op_count(ud, ins, X86_OP_IMM); |
|
if (count) { |
|
printf("\timm_count: %u\n", count); |
|
for (i = 1; i < count + 1; i++) { |
|
int index = cs_op_index(ud, ins, X86_OP_IMM, i); |
|
printf("\t\timms[%u]: 0x%"PRIx64 "\n", i, x86->operands[index].imm); |
|
} |
|
} |
|
|
|
if (x86->op_count) |
|
printf("\top_count: %u\n", x86->op_count); |
|
for (i = 0; i < x86->op_count; i++) { |
|
cs_x86_op *op = &(x86->operands[i]); |
|
|
|
switch((int)op->type) { |
|
case X86_OP_REG: |
|
printf("\t\toperands[%u].type: REG = %s\n", i, cs_reg_name(handle, op->reg)); |
|
break; |
|
case X86_OP_IMM: |
|
printf("\t\toperands[%u].type: IMM = 0x%"PRIx64 "\n", i, op->imm); |
|
break; |
|
case X86_OP_FP: |
|
printf("\t\toperands[%u].type: FP = %f\n", i, op->fp); |
|
break; |
|
case X86_OP_MEM: |
|
printf("\t\toperands[%u].type: MEM\n", i); |
|
if (op->mem.base != 0) |
|
printf("\t\t\toperands[%u].mem.base: REG = %s\n", i, cs_reg_name(handle, op->mem.base)); |
|
if (op->mem.index != 0) |
|
printf("\t\t\toperands[%u].mem.index: REG = %s\n", i, cs_reg_name(handle, op->mem.index)); |
|
if (op->mem.scale != 1) |
|
printf("\t\t\toperands[%u].mem.scale: %u\n", i, op->mem.scale); |
|
if (op->mem.disp != 0) |
|
printf("\t\t\toperands[%u].mem.disp: 0x%" PRIx64 "\n", i, op->mem.disp); |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
printf("\n"); |
|
} |
|
|
|
static void test() |
|
{ |
|
//#define X86_CODE32 "\x01\xd8\x81\xc6\x34\x12\x00\x00\x05\x78\x56\x00\x00" |
|
//#define X86_CODE32 "\x05\x78\x56\x00\x00" |
|
//#define X86_CODE32 "\x01\xd8" |
|
//#define X86_CODE32 "\x05\x23\x01\x00\x00" |
|
//#define X86_CODE32 "\x8d\x87\x89\x67\x00\x00" |
|
//#define X86_CODE32 "\xa1\x13\x48\x6d\x3a\x8b\x81\x23\x01\x00\x00\x8b\x84\x39\x23\x01\x00\x00" |
|
//#define X86_CODE32 "\xb4\xc6" // mov ah, 0x6c |
|
//#define X86_CODE32 "\x77\x04" // ja +6 |
|
#define X86_CODE64 "\x55\x48\x8b\x05\xb8\x13\x00\x00" |
|
//#define X86_CODE64 "\xe9\x79\xff\xff\xff" // jmp 0xf7e |
|
|
|
#define X86_CODE16 "\x8d\x4c\x32\x08\x01\xd8\x81\xc6\x34\x12\x00\x00\x05\x23\x01\x00\x00\x36\x8b\x84\x91\x23\x01\x00\x00\x41\x8d\x84\x39\x89\x67\x00\x00\x8d\x87\x89\x67\x00\x00\xb4\xc6" |
|
//#define X86_CODE16 "\x67\x00\x18" |
|
#define X86_CODE32 "\x8d\x4c\x32\x08\x01\xd8\x81\xc6\x34\x12\x00\x00\x05\x23\x01\x00\x00\x36\x8b\x84\x91\x23\x01\x00\x00\x41\x8d\x84\x39\x89\x67\x00\x00\x8d\x87\x89\x67\x00\x00\xb4\xc6" |
|
//#define X86_CODE32 "\x0f\xa7\xc0" // xstorerng |
|
//#define X86_CODE32 "\x64\xa1\x18\x00\x00\x00" // mov eax, dword ptr fs:[18] |
|
//#define X86_CODE32 "\x64\xa3\x00\x00\x00\x00" // mov [fs:0x0], eax |
|
//#define X86_CODE32 "\xd1\xe1" // shl ecx, 1 |
|
//#define X86_CODE32 "\xd1\xc8" // ror eax, 1 |
|
//#define X86_CODE32 "\x83\xC0\x80" // add eax, -x80 |
|
//#define X86_CODE32 "\xe8\x26\xfe\xff\xff" // call 0xe2b |
|
//#define X86_CODE32 "\xcd\x80" // int 0x80 |
|
//#define X86_CODE32 "\x24\xb8" // and $0xb8,%al |
|
//#define X86_CODE32 "\xf0\x01\xd8" // lock add eax,ebx |
|
//#define X86_CODE32 "\xf3\xaa" // rep stosb |
|
|
|
struct platform platforms[] = { |
|
{ |
|
.arch = CS_ARCH_X86, |
|
.mode = CS_MODE_16, |
|
.code = (unsigned char *)X86_CODE16, |
|
.size = sizeof(X86_CODE16) - 1, |
|
.comment = "X86 16bit (Intel syntax)" |
|
}, |
|
{ |
|
.arch = CS_ARCH_X86, |
|
.mode = CS_MODE_32, |
|
.code = (unsigned char *)X86_CODE32, |
|
.size = sizeof(X86_CODE32) - 1, |
|
.comment = "X86 32 (AT&T syntax)", |
|
.opt_type = CS_OPT_SYNTAX, |
|
.opt_value = CS_OPT_SYNTAX_ATT, |
|
}, |
|
{ |
|
.arch = CS_ARCH_X86, |
|
.mode = CS_MODE_32, |
|
.code = (unsigned char *)X86_CODE32, |
|
.size = sizeof(X86_CODE32) - 1, |
|
.comment = "X86 32 (Intel syntax)" |
|
}, |
|
{ |
|
.arch = CS_ARCH_X86, |
|
.mode = CS_MODE_64, |
|
.code = (unsigned char *)X86_CODE64, |
|
.size = sizeof(X86_CODE64) - 1, |
|
.comment = "X86 64 (Intel syntax)" |
|
}, |
|
}; |
|
|
|
uint64_t address = 0x1000; |
|
cs_insn *insn; |
|
int i; |
|
|
|
for (i = 0; i < sizeof(platforms)/sizeof(platforms[0]); i++) { |
|
cs_err err = cs_open(platforms[i].arch, platforms[i].mode, &handle); |
|
if (err) { |
|
printf("Failed on cs_open() with error returned: %u\n", err); |
|
continue; |
|
} |
|
|
|
if (platforms[i].opt_type) |
|
cs_option(handle, platforms[i].opt_type, platforms[i].opt_value); |
|
|
|
cs_option(handle, CS_OPT_DETAIL, CS_OPT_ON); |
|
|
|
size_t count = cs_disasm_ex(handle, platforms[i].code, platforms[i].size, address, 0, &insn); |
|
if (count) { |
|
printf("****************\n"); |
|
printf("Platform: %s\n", platforms[i].comment); |
|
print_string_hex("Code:", platforms[i].code, platforms[i].size); |
|
printf("Disasm:\n"); |
|
|
|
size_t j; |
|
for (j = 0; j < count; j++) { |
|
printf("0x%"PRIx64":\t%s\t%s\n", insn[j].address, insn[j].mnemonic, insn[j].op_str); |
|
print_insn_detail(handle, platforms[i].mode, &insn[j]); |
|
} |
|
printf("0x%"PRIx64":\n", insn[j-1].address + insn[j-1].size); |
|
|
|
// free memory allocated by cs_disasm_ex() |
|
cs_free(insn, count); |
|
} else { |
|
printf("****************\n"); |
|
printf("Platform: %s\n", platforms[i].comment); |
|
print_string_hex("Code:", platforms[i].code, platforms[i].size); |
|
printf("ERROR: Failed to disasm given code!\n"); |
|
} |
|
|
|
printf("\n"); |
|
|
|
cs_close(handle); |
|
} |
|
} |
|
|
|
int main() |
|
{ |
|
test(); |
|
|
|
return 0; |
|
}
|
|
|