public static function unit_lea()
{
if (($address = parent::$cpu->address()) === null) {
parent::exception(PLATO_EX_UNIT_LEA);
}
parent::$register->write(parent::$mod['code'], $address);
return 0;
}
public static function unit_jmp()
{
switch (parent::$opcode) {
/* EB cb */
case 0xeb:
parent::$cpu->jump(parent::$imm, false, 1);
break;
/* JMP rel16 */
/* JMP rel32 */
/* JMP rel16 */
/* JMP rel32 */
case 0xe9:
parent::$cpu->jump(parent::$imm, false);
break;
/* JMP r/m16 */
/* JMP r/m32 */
/* JMP r/m16 */
/* JMP r/m32 */
case 0xff:
parent::$cpu->jump(parent::$cpu->read_address());
break;
/* JMP ptr16:16 */
/* JMP ptr16:32 */
/* JMP ptr16:16 */
/* JMP ptr16:32 */
case 0xea:
/* cs */
parent::$code->next_word();
parent::$cpu->jump(parent::$imm);
break;
/* JMP m16:16 */
/* JMP m16:32 */
/* JMP m16:16 */
/* JMP m16:32 */
case 0xff:
if (($address = parent::$cpu->address()) === null) {
parent::exception(PLATO_EX_UNIT_JUMP);
}
parent::$cpu->jump(parent::$cpu->read_address($address));
break;
}
return 0;
}
public static function unit_ud2()
{
parent::exception(PLATO_EX_UNIT_UD3);
}
public static function unit_cpuid()
{
parent::exception(PLATO_EX_UNIT_CPUID);
}
public static function unit_int()
{
switch (parent::$opcode) {
/* INT 3 */
case 0xcc:
parent::exception(PLATO_EX_UNIT_INT3);
/* INT imm8 */
/* INT imm8 */
case 0xcd:
parent::exception(PLATO_EX_UNIT_INT);
/* INTO */
/* INTO */
case 0xce:
if (parent::$register->OF) {
parent::exception(PLATO_EX_UNIT_INTO);
}
break;
}
return 0;
}