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/* 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, size_t 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 count, i;
cs_x86 *x86;
// detail can be NULL on "data" instruction if SKIPDATA option is turned ON
if (ins->detail == NULL)
return;
x86 = &(ins->detail->x86);
print_string_hex("\tPrefix:", x86->prefix, 4);
print_string_hex("\tOpcode:", x86->opcode, 4);
printf("\trex: 0x%x\n", x86->rex);
printf("\taddr_size: %u\n", x86->addr_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_base != X86_REG_INVALID)
printf("\t\tsib_base: %s\n", cs_reg_name(handle, x86->sib_base));
if (x86->sib_index != X86_REG_INVALID)
printf("\t\tsib_index: %s\n", cs_reg_name(handle, x86->sib_index));
if (x86->sib_scale != 0)
printf("\t\tsib_scale: %d\n", x86->sib_scale);
}
// SSE code condition
if (x86->sse_cc != X86_SSE_CC_INVALID) {
printf("\tsse_cc: %u\n", x86->sse_cc);
}
// AVX code condition
if (x86->avx_cc != X86_AVX_CC_INVALID) {
printf("\tavx_cc: %u\n", x86->avx_cc);
}
// AVX Suppress All Exception
if (x86->avx_sae) {
printf("\tavx_sae: %u\n", x86->avx_sae);
}
// AVX Rounding Mode
if (x86->avx_rm != X86_AVX_RM_INVALID) {
printf("\tavx_rm: %u\n", x86->avx_rm);
}
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.segment != X86_REG_INVALID)
printf("\t\t\toperands[%u].mem.segment: REG = %s\n", i, cs_reg_name(handle, op->mem.segment));
if (op->mem.base != X86_REG_INVALID)
printf("\t\t\toperands[%u].mem.base: REG = %s\n", i, cs_reg_name(handle, op->mem.base));
if (op->mem.index != X86_REG_INVALID)
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;
}
// AVX broadcast type
if (op->avx_bcast != X86_AVX_BCAST_INVALID)
printf("\t\toperands[%u].avx_bcast: %u\n", i, op->avx_bcast);
// AVX zero opmask {z}
if (op->avx_zero_opmask != false)
printf("\t\toperands[%u].avx_zero_opmask: TRUE\n", i);
printf("\t\toperands[%u].size: %u\n", i, op->size);
}
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[] = {
{
CS_ARCH_X86,
CS_MODE_16,
(unsigned char *)X86_CODE16,
sizeof(X86_CODE16) - 1,
"X86 16bit (Intel syntax)"
},
{
CS_ARCH_X86,
CS_MODE_32,
(unsigned char *)X86_CODE32,
sizeof(X86_CODE32) - 1,
"X86 32 (AT&T syntax)",
CS_OPT_SYNTAX,
CS_OPT_SYNTAX_ATT,
},
{
CS_ARCH_X86,
CS_MODE_32,
(unsigned char *)X86_CODE32,
sizeof(X86_CODE32) - 1,
"X86 32 (Intel syntax)"
},
{
CS_ARCH_X86,
CS_MODE_64,
(unsigned char *)X86_CODE64,
sizeof(X86_CODE64) - 1,
"X86 64 (Intel syntax)"
},
};
uint64_t address = 0x1000;
cs_insn *insn;
int i;
size_t count;
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);
count = cs_disasm(handle, platforms[i].code, platforms[i].size, address, 0, &insn);
if (count) {
size_t j;
printf("****************\n");
printf("Platform: %s\n", platforms[i].comment);
print_string_hex("Code:", platforms[i].code, platforms[i].size);
printf("Disasm:\n");
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()
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;
}