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x86dec.h
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x86dec.h
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#include <cstdint>
#include <array>
struct decoder {
uint8_t prefix_seg;
uint8_t prefix_address_size;
uint8_t prefix_lock;
uint8_t prefix_operand_size;
uint8_t prefix_string;
int operand_size;
int address_size;
uint8_t opcode;
uint8_t opcode2;
uint8_t opcode3;
uint8_t modrm;
int32_t disp;
std::array<int32_t, 3> op_imm;
std::array<int, 3> op_imm_size;
int insn_size;
bool decode(uint8_t* begin) {
uint8_t* p = begin;
opcode = 0;
opcode2 = 0;
opcode3 = 0;
modrm = 0;
disp = 0;
op_imm = { 0,0,0 };
op_imm_size = { 0,0,0 };
insn_size = 0;
auto op_disp = [&](int size) {
if (size == 8) disp = (int8_t)*p++;
else if (size == 16) disp = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2;
else disp = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((uint32_t)(int8_t)p[3] << 24), p += 4;
};
auto op_mr = [&]() {
if (!(~modrm & (3 << 6))) return;
uint8_t mod = modrm >> 6 & 3;
uint8_t rm = modrm & 7;
if (address_size == 16) {
if ((mod == 0 && rm == 6) || mod == 2) op_disp(16);
else if (mod == 1) op_disp(8);
} else if (address_size == 32) {
if (rm == 4) {
if ((*p++ & 7) == 5) {
return op_disp(mod == 1 ? 8 : 32);
}
}
if ((mod == 0 && rm == 5) || mod == 2) op_disp(32);
else if (mod == 1) op_disp(8);
}
};
prefix_seg = 0;
prefix_address_size = 0;
prefix_lock = 0;
prefix_operand_size = 0;
prefix_string = 0;
while (true) {
switch (*p) {
case 0x26: case 0x2e: case 0x36: case 0x3e:
case 0x64: case 0x65:
prefix_seg = *p++;
continue;
case 0x66:
prefix_operand_size = *p++;
continue;
case 0x67:
prefix_address_size = *p++;
continue;
case 0xf0:
prefix_lock = *p++;
continue;
case 0xf2: case 0xf3:
prefix_string = *p++;
continue;
}
break;
}
operand_size = prefix_operand_size ? 16 : 32;
address_size = prefix_address_size ? 16 : 32;
opcode = *p;
switch (*p++) {
case 210: case 211:
((modrm = *p++) >> 3 & 7);
op_mr();
break;
case 208: case 209:
((modrm = *p++) >> 3 & 7);
op_mr();
op_imm[1] = 1;
break;
case 128: case 130: case 131: case 192: case 193:
((modrm = *p++) >> 3 & 7);
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
case 129:
((modrm = *p++) >> 3 & 7);
op_mr();
operand_size == 16 ? op_imm_size[1] = 16, op_imm[1] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2 : (op_imm_size[1] = 32, op_imm[1] = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((int32_t)(int8_t)p[3] << 24), p += 4);
break;
case 142:
(modrm = *p++);
break;
case 98: case 141: case 196: case 197:
(modrm = *p++);
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
case 0: case 1: case 2: case 3: case 8: case 9: case 10: case 11: case 16: case 17: case 18: case 19: case 24: case 25: case 26: case 27: case 32: case 33: case 34: case 35: case 40: case 41: case 42: case 43: case 48: case 49: case 50: case 51: case 56: case 57: case 58: case 59: case 99: case 132: case 133: case 134: case 135: case 136: case 137: case 138: case 139:
(modrm = *p++);
op_mr();
break;
case 107:
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
case 105:
(modrm = *p++);
op_mr();
operand_size == 16 ? op_imm_size[2] = 16, op_imm[2] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2 : (op_imm_size[2] = 32, op_imm[2] = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((int32_t)(int8_t)p[3] << 24), p += 4);
break;
case 216: case 218: case 220: case 222: case 223:
if (!((~(modrm = *p++) & (3 << 6)) == 0)) {
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
}
break;
case 221:
if (!((~(modrm = *p++) & (3 << 6)) == 0)) {
switch (modrm >> 3 & 7) {
case 0: case 1: case 2: case 3: case 4: case 6: case 7:
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
}
}
break;
case 219:
if (!((~(modrm = *p++) & (3 << 6)) == 0)) {
switch (modrm >> 3 & 7) {
case 0: case 1: case 2: case 3: case 5: case 7:
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
}
}
break;
case 217:
if (!((~(modrm = *p++) & (3 << 6)) == 0)) {
switch (modrm >> 3 & 7) {
case 0: case 2: case 3: case 4: case 5: case 6: case 7:
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
}
}
break;
case 198:
if (((modrm = *p++) >> 3 & 7) == 0) {
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
}
break;
case 199:
if (((modrm = *p++) >> 3 & 7) == 0) {
op_mr();
operand_size == 16 ? op_imm_size[1] = 16, op_imm[1] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2 : (op_imm_size[1] = 32, op_imm[1] = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((int32_t)(int8_t)p[3] << 24), p += 4);
}
break;
case 143:
if (((modrm = *p++) >> 3 & 7) == 0) {
op_mr();
}
break;
case 227:
if (prefix_address_size == 32) {
op_imm_size[0] = 8, op_imm[0] = (int8_t)*p++;
} else {
op_imm_size[0] = 8, op_imm[0] = (int8_t)*p++;
}
break;
case 160: case 161: case 162: case 163:
op_disp(address_size);
break;
case 194: case 202:
op_imm_size[0] = 16, op_imm[0] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2;
break;
case 200:
op_imm_size[0] = 16, op_imm[0] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2;
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
case 106: case 112: case 113: case 114: case 115: case 116: case 117: case 118: case 119: case 120: case 121: case 122: case 123: case 124: case 125: case 126: case 127: case 205: case 212: case 213: case 224: case 225: case 226: case 230: case 231: case 235:
op_imm_size[0] = 8, op_imm[0] = (int8_t)*p++;
break;
case 4: case 12: case 20: case 28: case 36: case 44: case 52: case 60: case 168: case 176: case 177: case 178: case 179: case 180: case 181: case 182: case 183: case 228: case 229:
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
case 15:
opcode2 = *p;
switch (*p++) {
case 13:
((modrm = *p++) >> 3 & 7);
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
case 178: case 180: case 181:
(modrm = *p++);
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
case 34: case 35:
(modrm = *p++);
if ((~modrm & (3 << 6))) return false;
op_mr();
break;
case 2: case 3: case 64: case 65: case 66: case 67: case 68: case 69: case 70: case 71: case 72: case 73: case 74: case 75: case 76: case 77: case 78: case 79: case 120: case 121: case 144: case 145: case 146: case 147: case 148: case 149: case 150: case 151: case 152: case 153: case 154: case 155: case 156: case 157: case 158: case 159: case 163: case 165: case 171: case 173: case 175: case 176: case 177: case 179: case 182: case 183: case 187: case 188: case 189: case 190: case 191: case 192: case 193:
(modrm = *p++);
op_mr();
break;
case 164: case 172:
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
case 174:
if (!((~(modrm = *p++) & (3 << 6)) == 0)) {
switch (modrm >> 3 & 7) {
case 0: case 1: case 2: case 3: case 4: case 5: case 7:
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
}
}
break;
case 25: case 26: case 27: case 28: case 29: case 30: case 31: case 195:
if (!(~(modrm = *p++) & (3 << 6))) return false;
op_mr();
break;
case 240:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 1) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 184:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 2) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
}
break;
case 108: case 109:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
}
break;
case 1:
if ((~(modrm = *p++) & (3 << 6)) == 0) {
if ((modrm >> 3 & 7) == 6) {
if ((~modrm & (3 << 6)) == 0) {
op_mr();
}
}
} else {
switch (modrm >> 3 & 7) {
case 0: case 1: case 2: case 3: case 7:
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 6:
if (!((~modrm & (3 << 6)) == 0)) {
op_mr();
}
break;
}
}
break;
case 247:
if ((~(modrm = *p++) & (3 << 6)) == 0) {
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
if ((~modrm & (3 << 6)) == 0) {
if ((~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if ((~modrm & (3 << 6)) == 0) {
if ((~modrm & (3 << 6))) return false;
op_mr();
}
break;
}
}
break;
case 22:
if ((~(modrm = *p++) & (3 << 6)) == 0) {
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 3:
if ((~modrm & (3 << 6)) == 0) {
if ((~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 2:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if ((~modrm & (3 << 6)) == 0) {
op_mr();
}
break;
}
} else {
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1:
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 2:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if (!((~modrm & (3 << 6)) == 0)) {
op_mr();
}
break;
}
}
break;
case 18:
if ((~(modrm = *p++) & (3 << 6)) == 0) {
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 3:
if ((~modrm & (3 << 6)) == 0) {
if ((~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 1: case 2:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if ((~modrm & (3 << 6)) == 0) {
op_mr();
}
break;
}
} else {
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0:
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if (!((~modrm & (3 << 6)) == 0)) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 1: case 2:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if (!((~modrm & (3 << 6)) == 0)) {
op_mr();
}
break;
}
}
break;
case 32: case 33:
if ((~(modrm = *p++) & (3 << 6))) return false;
op_mr();
break;
case 166: case 167:
modrm = *p++;
break;
case 58:
opcode3 = *p;
switch (*p++) {
case 33:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
if (!(~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
}
break;
case 32:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
}
break;
case 8: case 9: case 10: case 11: case 12: case 13: case 14: case 64: case 65: case 66: case 68: case 96: case 97: case 98: case 99: case 223:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
}
break;
case 22: case 34:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if (prefix_operand_size == 32) {
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
} else {
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
}
}
break;
case 20: case 21: case 23:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
}
break;
case 15:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
}
break;
}
break;
case 56:
opcode3 = *p;
switch (*p++) {
case 42:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 16: case 20: case 21: case 23: case 32: case 33: case 34: case 35: case 36: case 37: case 40: case 41: case 43: case 48: case 49: case 50: case 51: case 52: case 53: case 55: case 56: case 57: case 58: case 59: case 60: case 61: case 62: case 63: case 64: case 65: case 219: case 220: case 221: case 222: case 223:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
}
break;
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: case 10: case 11: case 28: case 29: case 30:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
(modrm = *p++);
op_mr();
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 240:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 2: case 3:
(modrm = *p++);
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
case 1:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 241:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 2: case 3:
if (!(~(modrm = *p++) & (3 << 6))) return false;
op_mr();
break;
case 1:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
}
break;
case 128: case 129: case 130: case 131: case 132: case 133: case 134: case 135: case 136: case 137: case 138: case 139: case 140: case 141: case 142: case 143:
operand_size == 16 ? op_imm_size[0] = 16, op_imm[0] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2 : (op_imm_size[0] = 32, op_imm[0] = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((int32_t)(int8_t)p[3] << 24), p += 4);
break;
case 15:
return false;
break;
case 24:
switch ((modrm = *p++) >> 3 & 7) {
case 0: case 1: case 2: case 3:
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
}
break;
case 0:
switch ((modrm = *p++) >> 3 & 7) {
case 2: case 3: case 4: case 5:
op_mr();
break;
}
break;
case 113: case 114:
switch ((modrm = *p++) >> 3 & 7) {
case 2: case 4: case 6:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
if ((~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if ((~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
}
break;
}
break;
case 115:
switch ((modrm = *p++) >> 3 & 7) {
case 3: case 7:
if ((prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) == 3) {
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if ((~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
}
break;
case 2: case 6:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
if ((~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if ((~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
}
break;
}
break;
case 186:
switch ((modrm = *p++) >> 3 & 7) {
case 4: case 5: case 6: case 7:
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
}
break;
case 199:
switch ((modrm = *p++) >> 3 & 7) {
case 7:
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
case 1:
if (prefix_operand_size == 32) {
if (!(~modrm & (3 << 6))) return false;
op_mr();
} else {
if (!(~modrm & (3 << 6))) return false;
op_mr();
}
break;
case 6:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1:
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
case 2: case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
}
break;
}
break;
case 16: case 17: case 42: case 44: case 45: case 81: case 88: case 89: case 90: case 92: case 93: case 94: case 95:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0:
(modrm = *p++);
op_mr();
break;
case 1: case 2: case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 112: case 194:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0:
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
case 1: case 2: case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
}
break;
case 91: case 111: case 126: case 127:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1:
(modrm = *p++);
op_mr();
break;
case 2: case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 80: case 215:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
(modrm = *p++);
if ((~modrm & (3 << 6))) return false;
op_mr();
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
if ((~modrm & (3 << 6))) return false;
op_mr();
break;
}
break;
case 197:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
(modrm = *p++);
if ((~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
if ((~modrm & (3 << 6))) return false;
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
}
break;
case 196:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
(modrm = *p++);
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
}
break;
case 20: case 21: case 40: case 41: case 46: case 47: case 84: case 85: case 86: case 87: case 96: case 97: case 98: case 99: case 100: case 101: case 102: case 103: case 104: case 105: case 106: case 107: case 110: case 116: case 117: case 118: case 209: case 210: case 211: case 212: case 213: case 216: case 217: case 218: case 219: case 220: case 221: case 222: case 223: case 224: case 225: case 226: case 227: case 228: case 229: case 232: case 233: case 234: case 235: case 236: case 237: case 238: case 239: case 241: case 242: case 243: case 244: case 245: case 246: case 248: case 249: case 250: case 251: case 252: case 253: case 254:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
(modrm = *p++);
op_mr();
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 198:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
op_imm_size[2] = 8, op_imm[2] = (int8_t)*p++;
break;
}
break;
case 19: case 23: case 43: case 231:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 2:
if (!(~(modrm = *p++) & (3 << 6))) return false;
op_mr();
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
if (!(~(modrm = *p++) & (3 << 6))) return false;
op_mr();
break;
}
break;
case 82: case 83:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 0: case 1: case 3:
(modrm = *p++);
op_mr();
break;
case 2:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 214:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 1: case 2:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
if ((~modrm & (3 << 6))) return false;
op_mr();
break;
case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 230:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 1: case 2: case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
case 124: case 125: case 208:
switch (prefix_string ? prefix_string == 0xf2 ? 1 : 2 : prefix_operand_size ? 3 : 0) {
case 1: case 3:
if (prefix_string) prefix_string = 0;
else prefix_operand_size = 0, operand_size = 32;
(modrm = *p++);
op_mr();
break;
}
break;
}
break;
case 104: case 232: case 233:
operand_size == 16 ? op_imm_size[0] = 16, op_imm[0] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2 : (op_imm_size[0] = 32, op_imm[0] = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((int32_t)(int8_t)p[3] << 24), p += 4);
break;
case 5: case 13: case 21: case 29: case 37: case 45: case 53: case 61: case 169: case 184: case 185: case 186: case 187: case 188: case 189: case 190: case 191:
operand_size == 16 ? op_imm_size[1] = 16, op_imm[1] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2 : (op_imm_size[1] = 32, op_imm[1] = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((int32_t)(int8_t)p[3] << 24), p += 4);
break;
case 154: case 234:
p += operand_size == 16 ? 4 : 6;
break;
case 254:
switch ((modrm = *p++) >> 3 & 7) {
case 0: case 1:
op_mr();
break;
}
break;
case 246:
switch ((modrm = *p++) >> 3 & 7) {
case 2: case 3: case 4: case 5: case 6: case 7:
op_mr();
break;
case 0: case 1:
op_mr();
op_imm_size[1] = 8, op_imm[1] = (int8_t)*p++;
break;
}
break;
case 247:
switch ((modrm = *p++) >> 3 & 7) {
case 2: case 3: case 4: case 5: case 6: case 7:
op_mr();
break;
case 0: case 1:
op_mr();
operand_size == 16 ? op_imm_size[1] = 16, op_imm[1] = (uint16_t)p[0] | ((int16_t)(int8_t)p[1] << 8), p += 2 : (op_imm_size[1] = 32, op_imm[1] = (uint32_t)p[0] | ((uint32_t)p[1] << 8) | ((uint32_t)p[2] << 16) | ((int32_t)(int8_t)p[3] << 24), p += 4);
break;
}
break;
case 255:
switch ((modrm = *p++) >> 3 & 7) {
case 3: case 5:
if (!(~modrm & (3 << 6))) return false;
op_mr();
break;
case 0: case 1: case 2: case 4: case 6:
op_mr();
break;
}
break;
}
insn_size = p - begin;
return true;
}
};