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disasm.cpp
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#include "disasm.h"
#include "dis-table.h"
#include "cstring"
#include "cstdlib"
#include "cstdio"
#include "cmath"
const char *RepeatPrefixes[] = {"lock", "rep", "repe", "repne"};
const char *SegmentRegisters[] = {"es", "cs", "ss", "ds", "fs", "gs", "seg?", "seg?"};
const char *Register32[] = {"eax", "ecx", "edx", "ebx", "esp", "ebp", "esi", "edi", "ebx + al"};
const char *Register16[] = {"ax", "cx", "dx", "bx", "sp", "bp", "si", "di"};
const char *Register8[] = {"al", "cl", "dl", "bl", "ah", "ch", "dh", "bh"};
const char *Register16_ModRM[] = {"bx + si", "bx + di", "bp + si", "bp + di", "si", "di", "bp", "bx", "bx + al", "ax", "cx", "dx", "sp"};
const char *FloatPointRegister[] = {"st(0)", "st(1)", "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)"};
const char *ControlRegister[] = {"cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7"};
const char *DebugRegister[] = {"dr0", "dr1", "dr2", "dr3", "dr4", "dr5", "dr6", "dr7"};
const char *XMMRegister[] = {"xmm0", "xmm1", "xmm2", "xmm3", "xmm4", "xmm5", "xmm6", "xmm7"};
const char *MMRegister[] = {"mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7"};
const char *PTR[] = {"word ptr ", "dword ptr ", "word ptr ", "byte ptr "};
Disasm::Disasm()
{
currentByte = 0;
codeSize = 0;
address = 0;
base = 0;
}
INT8 Disasm::decodePrefix()
{
currentByte++;
switch((unsigned char)machineCode[currentByte - 1]){
case PREFIX_LOCK:
if (lockAndRepeat != -1)
return COLLIDED_PREFIX;
lockAndRepeat = PREFIX_LOCK;
return CONTINUE_DECODING_PREFIX;
case PREFIX_REPN:
if (lockAndRepeat != -1)
return COLLIDED_PREFIX;
lockAndRepeat = PREFIX_REPN;
return CONTINUE_DECODING_PREFIX;
case PREFIX_REP:
if (lockAndRepeat != -1)
return COLLIDED_PREFIX;
lockAndRepeat = PREFIX_REP;
return CONTINUE_DECODING_PREFIX;
case PREFIX_CS:
if (segmentOverride != -1)
return COLLIDED_PREFIX;
segmentOverride = CS;
return CONTINUE_DECODING_PREFIX;
case PREFIX_SS:
if (segmentOverride != -1)
return COLLIDED_PREFIX;
segmentOverride = SS;
return CONTINUE_DECODING_PREFIX;
case PREFIX_DS:
if (segmentOverride != -1)
return COLLIDED_PREFIX;
segmentOverride = DS;
return CONTINUE_DECODING_PREFIX;
case PREFIX_ES:
if (segmentOverride != -1)
return COLLIDED_PREFIX;
segmentOverride = ES;
return CONTINUE_DECODING_PREFIX;
case PREFIX_FS:
if (segmentOverride != -1)
return COLLIDED_PREFIX;
segmentOverride = FS;
return CONTINUE_DECODING_PREFIX;
case PREFIX_GS:
if (segmentOverride != -1)
return COLLIDED_PREFIX;
segmentOverride = GS;
return CONTINUE_DECODING_PREFIX;
case PREFIX_OPERAND:
if (OperandSizeOverride != -1)
return COLLIDED_PREFIX;
OperandSizeOverride = PREFIX_OPERAND;
return CONTINUE_DECODING_PREFIX;
case PREFIX_ADDRESS:
if (AddressSizeOverride != -1)
return COLLIDED_PREFIX;
AddressSizeOverride = PREFIX_ADDRESS;
return CONTINUE_DECODING_PREFIX;
default:
currentByte--;
}
return NOT_PREFIX;
}
void Disasm::preprocessingFloatPointInstruction()
{
INT8 mod = (machineCode[currentByte] >> 6) & 3;
INT8 rm = (machineCode[currentByte]) & 7;
INT8 regop = (machineCode[currentByte] >> 3) & 7;
INT32 opcode = instruction->opcode;
currentByte++;
switch(opcode){
case 0xd8:
{
if (mod != 3)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_d8][regop & 7], sizeof(INSTRUCTION));
break;
}
case 0xd9:
{
switch((unsigned char)regop){
case 0:
{
if (mod != 3)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_d9][regop & 7], sizeof(INSTRUCTION));
break;
}
case 1:
{
if (mod != 3)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_d9][regop & 7], sizeof(INSTRUCTION));
break;
}
case 2:
{
// modR/M = 0xd0
if ((unsigned char)machineCode[currentByte - 1] == 0xd0)
memcpy(instruction, &floatInstruction_2[FLOAT_d9][regop & 7], sizeof(INSTRUCTION));
break;
}
case 4:
{
if ((unsigned char)machineCode[currentByte - 1] == 0xe0)
memcpy(instruction, &specialInstruction[SPECIAL_d9e0], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe1)
memcpy(instruction, &specialInstruction[SPECIAL_d9e1], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe4)
memcpy(instruction, &specialInstruction[SPECIAL_d9e4], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe5)
memcpy(instruction, &specialInstruction[SPECIAL_d9e5], sizeof(INSTRUCTION));
break;
}
case 5:
{
if ((unsigned char)machineCode[currentByte - 1] == 0xe8)
memcpy(instruction, &specialInstruction[SPECIAL_d9e8], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe9)
memcpy(instruction, &specialInstruction[SPECIAL_d9e9], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xea)
memcpy(instruction, &specialInstruction[SPECIAL_d9ea], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xeb)
memcpy(instruction, &specialInstruction[SPECIAL_d9eb], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xec)
memcpy(instruction, &specialInstruction[SPECIAL_d9ec], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xed)
memcpy(instruction, &specialInstruction[SPECIAL_d9ed], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xee)
memcpy(instruction, &specialInstruction[SPECIAL_d9ee], sizeof(INSTRUCTION));
break;
}
case 6:
{
if ((unsigned char)machineCode[currentByte - 1] == 0xf0)
memcpy(instruction, &specialInstruction[SPECIAL_d9f0], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf1)
memcpy(instruction, &specialInstruction[SPECIAL_d9f1], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf2)
memcpy(instruction, &specialInstruction[SPECIAL_d9f2], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf3)
memcpy(instruction, &specialInstruction[SPECIAL_d9f3], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf4)
memcpy(instruction, &specialInstruction[SPECIAL_d9f4], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf5)
memcpy(instruction, &specialInstruction[SPECIAL_d9f5], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf6)
memcpy(instruction, &specialInstruction[SPECIAL_d9f6], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf7)
memcpy(instruction, &specialInstruction[SPECIAL_d9f7], sizeof(INSTRUCTION));
break;
}
case 7:
{
if ((unsigned char)machineCode[currentByte - 1] == 0xf8)
memcpy(instruction, &specialInstruction[SPECIAL_d9f8], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xf9)
memcpy(instruction, &specialInstruction[SPECIAL_d9f9], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xfa)
memcpy(instruction, &specialInstruction[SPECIAL_d9fa], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xfb)
memcpy(instruction, &specialInstruction[SPECIAL_d9fb], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xfc)
memcpy(instruction, &specialInstruction[SPECIAL_d9fc], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xfd)
memcpy(instruction, &specialInstruction[SPECIAL_d9fd], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xfe)
memcpy(instruction, &specialInstruction[SPECIAL_d9fe], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xff)
memcpy(instruction, &specialInstruction[SPECIAL_d9ff], sizeof(INSTRUCTION));
break;
}
}
break;
}
case 0xda:
{
if (mod != 3)
break;
if (regop == 5 && (unsigned char)machineCode[currentByte - 1] != 0xe9)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_da][regop & 7], sizeof(INSTRUCTION));
break;
}
case 0xdb:
{
if ((unsigned char)machineCode[currentByte - 1] == 0xe0)
memcpy(instruction, &specialInstruction[SPECIAL_dbe0], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe1)
memcpy(instruction, &specialInstruction[SPECIAL_dbe1], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe2)
memcpy(instruction, &specialInstruction[SPECIAL_dbe2], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe3)
memcpy(instruction, &specialInstruction[SPECIAL_dbe3], sizeof(INSTRUCTION));
else if ((unsigned char)machineCode[currentByte - 1] == 0xe4)
memcpy(instruction, &specialInstruction[SPECIAL_dbe4], sizeof(INSTRUCTION));
else{
if (mod != 3)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_db][regop & 7], sizeof(INSTRUCTION));
}
break;
}
case 0xdc:
{
if (mod != 3)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_dc][regop & 7], sizeof(INSTRUCTION));
break;
}
case 0xdd:
{
if (mod != 3)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_dd][regop & 7], sizeof(INSTRUCTION));
break;
}
case 0xde:
{
if (mod != 3)
break;
if (regop == 3 && (unsigned char)machineCode[currentByte - 1] != 0xd9)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_de][regop & 7], sizeof(INSTRUCTION));
break;
}
case 0xdf:
{
if (mod != 3)
break;
if (regop == 4 && (unsigned char)machineCode[currentByte - 1] != 0xe0)
break;
memcpy(instruction, &floatInstruction_2[FLOAT_df][regop & 7], sizeof(INSTRUCTION));
break;
}
default:
break;
}
instruction->rm = rm;
instruction->regop = regop;
instruction->mod = mod;
instruction->opcode = opcode;
if ((instruction->dest && instruction->dest->type == OPERAND_MEMORY) ||
(instruction->src1 && instruction->src1->type == OPERAND_MEMORY) ||
(instruction->src2 && instruction->src2->type == OPERAND_MEMORY) ||
(instruction->src3 && instruction->src3->type == OPERAND_MEMORY) ||
instruction->type == UNDEFINED_INSTRUCTION)
currentByte--;
}
INT8 Disasm::specialMnemonicProcess()
{
INT32 opcode = instruction->opcode;
switch(opcode){
// PUSHAD
case 0x60:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_60], sizeof(INSTRUCTION));
instruction->type = STACK_OPERATE_INSTRUCTION;
break;
}
// POPAD
case 0x61:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_61], sizeof(INSTRUCTION));
instruction->type = STACK_OPERATE_INSTRUCTION;
break;
}
// PUSHFD
case 0x9c:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_9c], sizeof(INSTRUCTION));
instruction->type = STACK_OPERATE_INSTRUCTION;
break;
}
// POPFD
case 0x9d:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_9d], sizeof(INSTRUCTION));
instruction->type = STACK_OPERATE_INSTRUCTION;
break;
}
// NOP
case 0x90:{
if ((unsigned char)lockAndRepeat == PREFIX_REP)
memcpy(instruction, &specialInstruction[SPECIAL_90_1], sizeof(INSTRUCTION));
else if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_90_2], sizeof(INSTRUCTION));
else
instruction->type = IRREPLACEABLE_INSTRUCTION;
break;
}
// CBW
case 0x98:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_98], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
// CDQ
case 0x99:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_99], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
// IRET
case 0xcf:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_cf], sizeof(INSTRUCTION));
instruction->type = STACK_OPERATE_INSTRUCTION;
break;
}
// AAM
case 0xd4:{
if ((unsigned char)machineCode[currentByte] == 0x0a){
currentByte++;
memcpy(instruction, &specialInstruction[SPECIAL_d4], sizeof(INSTRUCTION));
}
instruction->type = NORMAL_INSTRUCTION;
break;
}
// AAD
case 0xd5:{
if ((unsigned char)machineCode[currentByte] == 0x0a){
currentByte++;
memcpy(instruction, &specialInstruction[SPECIAL_d5], sizeof(INSTRUCTION));
}
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0xe0:
{
if (AddressSizeOverride == PREFIX_ADDRESS)
memcpy(instruction, &specialInstruction[SPECIAL_e0], sizeof(INSTRUCTION));
instruction->type = FLOW_INSTRUCTION;
break;
}
case 0xe1:
{
if (AddressSizeOverride == PREFIX_ADDRESS)
memcpy(instruction, &specialInstruction[SPECIAL_e1], sizeof(INSTRUCTION));
instruction->type = FLOW_INSTRUCTION;
break;
}
case 0xe2:
{
if (AddressSizeOverride == PREFIX_ADDRESS)
memcpy(instruction, &specialInstruction[SPECIAL_e2], sizeof(INSTRUCTION));
instruction->type = FLOW_INSTRUCTION;
break;
}
case 0xe3:
{
if (AddressSizeOverride == PREFIX_ADDRESS)
memcpy(instruction, &specialInstruction[SPECIAL_e3], sizeof(INSTRUCTION));
instruction->type = FLOW_INSTRUCTION;
break;
}
// AUXILIARY OPCODE = 7
case 0xff:{
currentByte++;
instruction->type = UNDEFINED_INSTRUCTION;
break;
}
// 0x0f10
case 0x0f10:{
if ((unsigned char)lockAndRepeat == PREFIX_REP)
memcpy(instruction, &specialInstruction[SPECIAL_0f10_1], sizeof(INSTRUCTION));
else if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f10_2], sizeof(INSTRUCTION));
else if ((unsigned char)lockAndRepeat == PREFIX_REPN)
memcpy(instruction, &specialInstruction[SPECIAL_0f10_3], sizeof(INSTRUCTION));
lockAndRepeat = -1;
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f11:{
if ((unsigned char)lockAndRepeat == PREFIX_REP)
memcpy(instruction, &specialInstruction[SPECIAL_0f11_1], sizeof(INSTRUCTION));
else if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f11_2], sizeof(INSTRUCTION));
else if ((unsigned char)lockAndRepeat == PREFIX_REPN)
memcpy(instruction, &specialInstruction[SPECIAL_0f11_3], sizeof(INSTRUCTION));
lockAndRepeat = -1;
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f12:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f12_1], sizeof(INSTRUCTION));
else if ((unsigned char)lockAndRepeat == PREFIX_REPN && ((machineCode[currentByte] >> 6) & 3) != 3)
memcpy(instruction, &specialInstruction[SPECIAL_0f12_2], sizeof(INSTRUCTION));
else if ((unsigned char)lockAndRepeat == PREFIX_REP && ((machineCode[currentByte] >> 6) & 3) != 3)
memcpy(instruction, &specialInstruction[SPECIAL_0f12_3], sizeof(INSTRUCTION));
else if (((machineCode[currentByte] >> 6) & 3) == 3)
memcpy(instruction, &specialInstruction[SPECIAL_0f12_4], sizeof(INSTRUCTION));
lockAndRepeat = -1;
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f13:{
if (((machineCode[currentByte] >> 6) & 3) == 3)
memcpy(instruction, &specialInstruction[SPECIAL_0f13], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f14: case 0x0f15:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f14], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f16:{
if (OperandSizeOverride == PREFIX_OPERAND && ((machineCode[currentByte] >> 6) & 3) != 3)
memcpy(instruction, &specialInstruction[SPECIAL_0f16_1], sizeof(INSTRUCTION));
else if ((unsigned char)lockAndRepeat == PREFIX_REP && ((machineCode[currentByte] >> 6) & 3) != 3)
memcpy(instruction, &specialInstruction[SPECIAL_0f16_2], sizeof(INSTRUCTION));
else if (((machineCode[currentByte] >> 6) & 3) == 3)
memcpy(instruction, &specialInstruction[SPECIAL_0f16_3], sizeof(INSTRUCTION));
lockAndRepeat = -1;
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f17:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f17], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f28:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f28], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f29:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f29], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f2a:{
if ((unsigned char)lockAndRepeat == PREFIX_REP)
memcpy(instruction, &specialInstruction[SPECIAL_0f2a_1], sizeof(INSTRUCTION));
else if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f2a_2], sizeof(INSTRUCTION));
else if ((unsigned char)lockAndRepeat == PREFIX_REPN)
memcpy(instruction, &specialInstruction[SPECIAL_0f2a_3], sizeof(INSTRUCTION));
lockAndRepeat = -1;
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0f2b:{
if (OperandSizeOverride == PREFIX_OPERAND)
memcpy(instruction, &specialInstruction[SPECIAL_0f2b], sizeof(INSTRUCTION));
instruction->type = NORMAL_INSTRUCTION;
break;
}
case 0x0fb8:{
if ((unsigned char)lockAndRepeat != PREFIX_REP)
memcpy(instruction, &specialInstruction[SPECIAL_0fb8], sizeof(INSTRUCTION));
lockAndRepeat = -1;
break;
}
default:
break;
}
instruction->opcode = opcode;
return DECODE_SUCCESS;
}
INT8 Disasm::validatePrefix(){
if (lockAndRepeat == -1)
return PREFIX_QUALIFY;
if ((unsigned char)lockAndRepeat == PREFIX_LOCK)
lockAndRepeat = LOCK;
else if ((unsigned char)lockAndRepeat == PREFIX_REP){
switch (instruction->opcode) {
case 0x6c: case 0x6d: case 0xa4: case 0xa5: case 0x6e: case 0x6f: case 0xac: case 0xad:
case 0xaa: case 0xab:
lockAndRepeat = REP;
break;
case 0xa6: case 0xa7: case 0xae: case 0xaf: case 0xc3:
lockAndRepeat = REPE;
break;
default:
return PREFIX_NOT_QUALIFY;
}
}
else{
switch (instruction->opcode) {
case 0xa6: case 0xa7: case 0xae: case 0xaf:
lockAndRepeat = REPNE;
break;
default:
return PREFIX_NOT_QUALIFY;
}
}
return PREFIX_QUALIFY;
}
INT8 Disasm::decodeModRM(Operand *operand, INT8 operand_number)
{
if (operand == NULL)
return OPERAND_NOT_EXIST;
INT8 ret = -1;
if (operand->type == OPERAND_MEMORY || operand->type == OPERAND_MEMORY_OFFSET || operand->type == OPERAND_XMM_MEMORY){
currentByte++;
if (instruction->mod != 3 || operand->type == OPERAND_MEMORY_OFFSET){ // memory
if (operand->operand_size == SIZE_DWORD){
if (OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size = SIZE_WORD;
}
else if (operand->operand_size == SIZE_FWORD){
if (OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size = SIZE_DWORD;
}
else if (operand->operand_size == SIZE_QWORD){
if (OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size = SIZE_DWORD;
}
else if (operand->operand_size != SIZE_WORD &&
operand->operand_size != SIZE_BYTE &&
operand->operand_size != 512 &&
operand->operand_size != SIZE_FIXED_DWORD &&
operand->operand_size != SIZE_FIXED_FWORD &&
operand->operand_size != SIZE_FIXED_QWORD &&
operand->operand_size != SIZE_DQWORD){
if (operand->operand_size == 108){
if (OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size = 94;
}
else{
if (OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size /= 2;
}
}
if (operand->segment != -1){
if (segmentOverride != -1 && operand->segment == DS)
operand->segment = segmentOverride;
}
else if (AddressSizeOverride == PREFIX_ADDRESS || instruction->rm != 4){ // don't have sib
if (AddressSizeOverride == PREFIX_ADDRESS){
if (segmentOverride != -1)
operand->segment = segmentOverride;
else if (instruction->rm == 2 || instruction->rm == 3 || (instruction->mod != 00 &&instruction->rm == 6))
operand->segment = SS;
else
operand->segment = DS;
}
else{
if (segmentOverride != -1)
operand->segment = segmentOverride;
else if (instruction->mod != 0 && instruction->rm == 5)
operand->segment = SS;
else
operand->segment = DS;
}
}
else{ // have sib
operand->scale = (machineCode[currentByte] >> 6) & 3; // first 2 buts of SIB
operand->base = machineCode[currentByte] & 0x07; // last 3 bits of SIB
operand->index = (machineCode[currentByte] >> 3) & 7; // middle 3 bits of SIB
if (segmentOverride != -1)
operand->segment = segmentOverride;
else if (operand->base == 4 || (instruction->mod != 0x0 && operand->base == 5))
operand->segment = SS;
else
operand->segment = DS;
}
if (AddressSizeOverride == PREFIX_ADDRESS && operand->addressing_size == SIZE_DWORD)
operand->addressing_size = SIZE_WORD;
if (operand->type == OPERAND_MEMORY_OFFSET){
currentByte--;
ret = getImmediateOrDisplacement(operand, IS_OFFSET, operand->addressing_size);
if (ret == NOT_ENOUGH_CODE)
return ret;
}
else{
if (operand->operand != -1){ // don't need further decode modr/m or sib
currentByte--; // don't need next byte to decode
if (operand->addressing_size == SIZE_WORD){ // a little adjustment
if (operand->operand == AX)
operand->operand = ADDRESSING_AX;
else if (operand->operand == CX)
operand->operand = ADDRESSING_CX;
else if (operand->operand == DX)
operand->operand = ADDRESSING_DX;
else if (operand->operand == BX)
operand->operand = ADDRESSING_BX;
else if (operand->operand == SP)
operand->operand = ADDRESSING_SP;
else if (operand->operand == BP)
operand->operand = ADDRESSING_BP;
else if (operand->operand == SI)
operand->operand = ADDRESSING_SI;
else if (operand->operand == DI)
operand->operand = ADDRESSING_DI;
}
}
else{
if (operand->addressing_size == SIZE_WORD || instruction->rm != 4){ // don't have sib
operand->operand = instruction->rm & 7;
if (instruction->mod == 0){ // mod = 0
if (operand->addressing_size == SIZE_WORD){
if (instruction->rm == 6){
operand->operand = -1;
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_WORD);
}
}
else{
if (instruction->rm == 5){
operand->operand = -1;
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_DWORD);
}
}
if (ret == NOT_ENOUGH_CODE)
return ret;
}
else if (instruction->mod == 1){ // mod = 1
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_BYTE);
if (ret == NOT_ENOUGH_CODE)
return ret;
}
else{ // mod = 2
if (operand->addressing_size == SIZE_WORD)
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_WORD);
else
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_DWORD);
if (ret == NOT_ENOUGH_CODE)
return ret;
}
}
else{ // need sib
operand->operand = -1;
operand->scale = (machineCode[currentByte] >> 6) & 3; // first 2 buts of SIB
operand->base = machineCode[currentByte] & 7; // last 3 bits of SIB
operand->index = (machineCode[currentByte] >> 3) & 7; // middle 3 bits of SIB
instruction->SIB = machineCode[currentByte++];
// displacement
if (instruction->mod == 0){
if (operand->base == 5){
operand->base = -1;
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_DWORD);
}
}
else if (instruction->mod == 1)
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_BYTE);
else
ret = getImmediateOrDisplacement(operand, IS_DISPLACEMENT, SIZE_DWORD);
if (ret == NOT_ENOUGH_CODE)
return ret;
}
}
}
}
else{ // mod == 3, register
if (OperandSizeOverride == PREFIX_OPERAND && operand->operand_size == SIZE_DWORD)
operand->operand_size = SIZE_WORD;
operand->operand = instruction->rm & 7;
if (operand->type == OPERAND_XMM_MEMORY){
operand->operand_size = SIZE_XMM;
operand->type = OPERAND_XMM_REGISTER;
}
else
operand->type = OPERAND_REGISTER;
}
}
else if (operand->type == OPERAND_REGISTER || operand->type == OPERAND_XMM_REGISTER){
if (operand->operand == -1)
operand->operand = instruction->regop & 7;
if (operand->type == OPERAND_REGISTER){
if (operand->operand_size == SIZE_DWORD && OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size = SIZE_WORD;
else if (operand->operand_size == SIZE_QWORD && OperandSizeOverride == PREFIX_OPERAND)
operand->scale = SIZE_DWORD;
}
}
else if (operand->type == OPERAND_IMMEDIATE){
if (operand->operand != -1)
return DECODE_SUCCESS;
else if (operand->operand_size == SIZE_BYTE)
ret = getImmediateOrDisplacement(operand, IS_IMMEDIATE, operand->operand_size);
else if (operand->operand_size == SIZE_WORD)
ret = getImmediateOrDisplacement(operand, IS_IMMEDIATE, operand->operand_size);
else if (operand->operand_size == SIZE_FIXED_DWORD)
ret = getImmediateOrDisplacement(operand, IS_IMMEDIATE, operand->operand_size);
else{
if (OperandSizeOverride == PREFIX_OPERAND){
operand->operand_size = SIZE_WORD;
ret = getImmediateOrDisplacement(operand, IS_IMMEDIATE, operand->operand_size);
}
else
ret = getImmediateOrDisplacement(operand, IS_IMMEDIATE, operand->operand_size);
}
if (ret == NOT_ENOUGH_CODE)
return ret;
}
else if (operand->type == OPERAND_SEGMENT){
if (operand->operand == -1)
operand->operand = instruction->regop;
}
else if (operand->type == OPERAND_FLOW){
if (operand->operand_size == RELATIVE_ADDRESS_SHORT){
operand->operand = machineCode[currentByte++];
instruction->new_eip = address + operand->operand + currentByte;
if (OperandSizeOverride == PREFIX_OPERAND)
instruction->new_eip &= 0x0000ffff;
}
else if (operand->operand_size == ADDRESS_FAR_ABSOLUTE){
if (OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size = ADDRESS_FAR_ABSOLUTE_WORD;
else
operand->operand_size = ADDRESS_FAR_ABSOLUTE_DWORD;
ret = getImmediateOrDisplacement(operand, IS_NEW_EIP, operand->operand_size);
if (ret == NOT_ENOUGH_CODE)
return ret;
ret = getImmediateOrDisplacement(operand, IS_NEW_CS, SIZE_WORD);
if (ret == NOT_ENOUGH_CODE)
return ret;
}
else if (operand->operand_size == RELATIVE_ADDRESS_FAR){
if (OperandSizeOverride == PREFIX_OPERAND)
operand->operand_size = RELATIVE_ADDRESS_FAR_WORD;
else
operand->operand_size = RELATIVE_ADDRESS_FAR_DWORD;
ret = getImmediateOrDisplacement(operand, IS_NEW_EIP, operand->operand_size);
if (ret == NOT_ENOUGH_CODE)
return ret;
instruction->new_eip += address + currentByte;
if (OperandSizeOverride == PREFIX_OPERAND)
instruction->new_eip &= 0x0000ffff;
}
}
else if (operand->type == OPERAND_FLOAT){
if (operand->operand == -1)
operand->operand = instruction->rm;
}
else if (operand->type == OPERAND_CR){
currentByte++;
if (operand_number == FIRST_OPERAND)
instruction->src1->operand = instruction->rm;
else
instruction->dest->operand = instruction->rm;
operand->operand = instruction->regop;
}
else if (operand->type == OPERAND_DR){
currentByte++;
if (operand_number == FIRST_OPERAND)
instruction->src1->operand = instruction->rm;
else
instruction->dest->operand = instruction->rm;
operand->operand = instruction->regop;
}
return DECODE_SUCCESS;
}
INT8 Disasm::getImmediateOrDisplacement(Operand *operand, INT8 type, INT8 size)
{
INT32 immediate = 0, s = 0;
if (size == SIZE_BYTE || size == RELATIVE_ADDRESS_SHORT){
if (codeSize == currentByte)
return NOT_ENOUGH_CODE;
s = 8;
}
else if (size == SIZE_WORD || size == ADDRESS_FAR_ABSOLUTE_WORD || size == RELATIVE_ADDRESS_FAR_WORD){
if (codeSize < currentByte + 2)
return NOT_ENOUGH_CODE;
s = 16;
}
else if (size == SIZE_DWORD || size == ADDRESS_FAR_ABSOLUTE_DWORD || size == RELATIVE_ADDRESS_FAR_DWORD){
if (codeSize < currentByte + 4)
return NOT_ENOUGH_CODE;
s = 32;
}
memcpy(&immediate, &machineCode[currentByte], s / 8);
currentByte += s / 8;
if (type == IS_IMMEDIATE || type == IS_OFFSET)
operand->operand = immediate;
else if (type == IS_DISPLACEMENT){
operand->displacement = immediate;
operand->displacement_size = size;
}
else if (type == IS_NEW_CS)
instruction->new_cs = immediate;
else{
operand->operand = immediate;
instruction->new_eip = immediate;
}
return ADD_SUCCESS;
}
int Disasm::needToChangeSign(Operand *operand, int size, INT8 type)
{
if (instruction->s == 0 && operand->type == OPERAND_IMMEDIATE)
return 0;
switch(size){
case 8:
return 1;
case 16:
return 0;
case 32:
if ((type == IS_DISPLACEMENT && ((operand->displacement & 0xfffff000) == 0xfffff000)) ||
(type == IS_IMMEDIATE && ((operand->operand & 0xfffff000) == 0xfffff000)))
return 1;
return 0;
}
return 0;
}
void Disasm::addRegister(Operand *operand, bool isDefault)
{
if (isDefault)
return;
if (operand->operand_size == SIZE_BYTE)
strcat(assemblyCode, Register8[operand->operand]);
else if (operand->operand_size == SIZE_WORD)
strcat(assemblyCode, Register16[operand->operand]);
else if (operand->operand_size == SIZE_FIXED_DWORD)
strcat(assemblyCode, Register32[operand->operand]);
else
strcat(assemblyCode, Register32[operand->operand]);
}
void Disasm::addRetCode()
{
int i = 0;
for (; i < currentByte; i++){
strcat(ret_machineCode, int2str(&machineCode[i], sizeof(INT8), 1, 0));
strcat(ret_machineCode, " ");
}
INT8 *binary = (INT8*)malloc(currentByte);
memcpy(binary, machineCode, currentByte);
instruction->binary = binary;
}
void Disasm::addImmediate(char *str, Operand *operand, INT8 size, bool noRegister, INT8 type, bool fixedSize, bool isAbsolute)
{
int isExtend = (strcmp(instruction->mnemonic, "or ") == 0 || strcmp(instruction->mnemonic, "and ") == 0 ||
strcmp(instruction->mnemonic, "xor ") == 0), s = 0, i = 0;
if (size == SIZE_BYTE)
s = 8;
else if (size == SIZE_WORD || size == ADDRESS_FAR_ABSOLUTE_WORD)
s = 16;
else if (size == SIZE_DWORD || size == ADDRESS_FAR_ABSOLUTE_DWORD)
s = 32;
INT32 immediate = -1;
if (type == IS_IMMEDIATE || type == IS_OFFSET)
immediate = operand->operand;
else if (type == IS_DISPLACEMENT)
immediate = operand->displacement;
else if (type == IS_NEW_EIP)
immediate = instruction->new_eip;
else if (type == IS_NEW_CS)
immediate = instruction->new_cs;
bool minus = false;
if ((s == 8 && immediate & 0x00000080) || (s == 16 && immediate & 0x00008000) || (s == 32 && immediate & 0x80000000))
minus = true;
if (minus){
if (type == IS_IMMEDIATE){
if (!isAbsolute && needToChangeSign(operand, s, IS_IMMEDIATE)){
strcat(str, "-");
immediate *= -1;
}
}
else{
if (!noRegister){
if (needToChangeSign(operand, s, IS_DISPLACEMENT)){
strcat(str, " - ");
immediate *= -1;
}
else{
strcat(str, " + ");
}
}
}
if (isExtend && (type == IS_IMMEDIATE))
strcat(str, int2str(&immediate, s / 8, fixedSize, 1));
else
strcat(str, int2str(&immediate, s / 8, fixedSize, 0));
}
else if (immediate == 0){
if (noRegister){
if (!fixedSize)
strcat(str, "0");
else{
for (; i < s / 4; i++)
strcat(str, "0");
}
}
}
else{
if (!noRegister)
strcat(str, " + ");
strcat(str, int2str(&immediate, s / 8, fixedSize, 0));
}
}
void Disasm::copyOperand(Operand *operand, INT8 operand_number)
{
char num[10];
static int operand_order = FIRST_OPERAND;
if (operand_number == FIRST_OPERAND)
operand_order = FIRST_OPERAND;
if (operand == NULL || operand->isDefault)
return;
if (operand_order != FIRST_OPERAND)
strcat(assemblyCode, ", ");
if (!operand->isDefault){
if (operand->type == OPERAND_REGISTER)
addRegister(operand, 1);
operand_order++;
}
if (operand->type == OPERAND_MEMORY || operand->type == OPERAND_MEMORY_OFFSET || operand->type == OPERAND_XMM_MEMORY){
if (operand->operand_size == SIZE_BYTE)
strcat(assemblyCode, "byte ptr ");
else if (operand->operand_size == SIZE_WORD)
strcat(assemblyCode, "word ptr ");
else if (operand->operand_size == SIZE_DWORD)
strcat(assemblyCode, "dword ptr ");
else if (operand->operand_size == SIZE_FIXED_DWORD)
strcat(assemblyCode, "dword ptr ");
else if (operand->operand_size == SIZE_FWORD)
strcat(assemblyCode, "fword ptr ");
else if (operand->operand_size == SIZE_FIXED_FWORD)
strcat(assemblyCode, "fword ptr ");
else if (operand->operand_size == SIZE_QWORD)
strcat(assemblyCode, "qword ptr ");
else if (operand->operand_size == SIZE_FIXED_QWORD)
strcat(assemblyCode, "qword ptr ");
else if (operand->operand_size == SIZE_TBYTE)
strcat(assemblyCode, "tbyte ptr ");
else if (operand->operand_size == SIZE_DQWORD)
strcat(assemblyCode, "dqword ptr ");
else{
sprintf(num, "%d", operand->operand_size);
strcat(assemblyCode, "<");
strcat(assemblyCode, num);
strcat(assemblyCode, "-byte");
strcat(assemblyCode, "> ptr ");
}