public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
switch (instruction.Argument1)
{
case (int)Register.SP:
// 8086 has a bug where it pushes SP after it has been modified
// cpu.registers[(int)Register.SP] -= 2;
// cpu.WriteU16(SegmentToAddress(cpu.GetRegister(Register.SS), cpu.GetRegister(Register.SP)), cpu.GetRegister(Register.SP));
// break;
case (int)Register.AX:
case (int)Register.CX:
case (int)Register.DX:
case (int)Register.BX:
case (int)Register.BP:
case (int)Register.SI:
case (int)Register.DI:
case (int)Register.IP:
case (int)Register.CS:
case (int)Register.DS:
case (int)Register.ES:
case (int)Register.SS:
case unchecked ((int)Register.FLAGS):
cpu.Push(cpu.GetRegister((Register)instruction.Argument1));
break;
case OpCodeManager.ARG_DEREFERENCE:
case OpCodeManager.ARG_MEMORY:
var address = InstructionHelper.GetInstructionRealAddress(cpu, instruction.SegmentPrefix, instruction.Argument1, instruction.Argument1Value, instruction.Argument1Displacement);
cpu.Push(cpu.ReadU16(address));
break;
default:
throw new ArgumentOutOfRangeException();
}
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
var address = InstructionHelper.GetInstructionValue(cpu, instruction.Flag, instruction.SegmentPrefix, instruction.Argument1, instruction.Argument1Value, instruction.Argument1Displacement);
cpu.Push(cpu.GetRegister(Register.IP));
cpu.SetRegister(Register.IP, address);
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
cpu.Push(cpu.GetRegister(Register.CS));
cpu.Push(cpu.GetRegister(Register.IP));
new FarJump().Dispatch(cpu, instruction);
}
public void Dispatch(Cpu8086 cpu, OpCodeManager.Instruction instruction)
{
Debug.Assert(instruction.Argument1 == OpCodeManager.ARG_CONSTANT);
cpu.Push(cpu.GetRegister(Register.IP));
cpu.SetRegister(Register.IP, (ushort)(cpu.GetRegister(Register.IP) + instruction.Argument1Value));
}