protected ushort GetAddress()
{
var z = ExecutionEngine.Opcode.Definition.Z;
var y = ExecutionEngine.Opcode.Definition.Y;
var x = ExecutionEngine.Opcode.Definition.X;
var p = ExecutionEngine.Opcode.Definition.P;
if (x == 0 && z == 2)
{
switch (p)
{
case 0:
return(Registers.BC);
case 1:
return(Registers.DE);
}
}
if (x == 1 && y == 6)
{
return(GetHLOrIXIY());
}
throw Errors.AssignedToIllegalOpcode();
}
protected void ThrowIfNoParametersFound()
{
if (ExecutionEngine.MultiCycleOpcode == null)
{
throw Errors.AssignedToIllegalOpcode();
}
if (ExecutionEngine.MultiCycleOpcode.ParameterCount == 0)
{
throw Errors.ParametersNotFound();
}
}
protected virtual bool IsConditionMet()
{
if (ExecutionEngine.Opcode.Definition.Z == 0)
{
return(Registers.FlagFromOpcodeY(ExecutionEngine.Opcode.Definition.Y));
}
else if (ExecutionEngine.Opcode.Definition.Z == 1)
{
// ret (no condition)
return(true);
}
throw Errors.AssignedToIllegalOpcode();
}
protected override byte ExecuteOperation(byte value)
{
var bit = ExecutionEngine.Opcode.Definition.Y;
switch (ExecutionEngine.Opcode.Definition.X)
{
case 2: //res
return Die.Alu.ResetBit(bit, value);
case 3: //set
return Die.Alu.SetBit(bit, value);
default:
throw Errors.AssignedToIllegalOpcode();
}
}
protected override void OnLastCycleFirstM()
{
switch (ExecutionEngine.Opcode.Definition.Y)
{
case 6:
SetCarryFlag();
break;
case 7:
ComplementCarryFlag();
break;
default:
throw Errors.AssignedToIllegalOpcode();
}
}
protected override void OnLastCycleFirstM()
{
switch (ExecutionEngine.Opcode.Definition.Y)
{
case 4: //daa
DecimalAdjustAccumulator();
break;
case 5: //cpl
ComplementAccumulator();
break;
default:
throw Errors.AssignedToIllegalOpcode();
}
}
protected override void OnLastCycleFirstM()
{
switch (ExecutionEngine.Opcode.Definition.Y)
{
case 6: // di
ExecutionEngine.InterruptManager.DisableInterrupt();
break;
case 7: // ei
ExecutionEngine.InterruptManager.EnableInterrupt();
ExecutionEngine.InterruptManager.SuspendInterrupts();
break;
default:
throw Errors.AssignedToIllegalOpcode();
}
}
protected override void OnClockNeg()
{
if (ExecutionEngine.Cycles.IsLastCycle &&
ExecutionEngine.Cycles.MachineCycle == MachineCycleNames.M3)
{
if (IsConditionMet() && IsRepeat)
{
if (ExecutionEngine.Opcode.Definition.AltCycles == null)
{
throw Errors.AssignedToIllegalOpcode();
}
ExecutionEngine.Cycles.SetAltCycles();
}
}
base.OnClockNeg();
}
private ushort GetAddress()
{
ushort address;
if (ExecutionEngine.Opcode.Definition.IsIX)
{
address = Registers.IX;
}
else if (ExecutionEngine.Opcode.Definition.IsIY)
{
address = Registers.IY;
}
else
{
throw Errors.AssignedToIllegalOpcode();
}
return(Alu.Add(address, (sbyte)InstructionM2.Data.Value));
}
protected ushort GetAddress()
{
var z = ExecutionEngine.Opcode.Definition.Z;
var y = ExecutionEngine.Opcode.Definition.Y;
var x = ExecutionEngine.Opcode.Definition.X;
var q = ExecutionEngine.Opcode.Definition.Q;
var p = ExecutionEngine.Opcode.Definition.P;
// TODO: check z -for other instructions
if (x == 0 && z == 2)
{
switch (p)
{
case 0:
return(Registers.BC);
case 1:
return(Registers.DE);
default:
throw Errors.AssignedToIllegalOpcode();
}
}
var isCB = ExecutionEngine.Opcode.Definition.Ext1 == 0xCB ||
ExecutionEngine.Opcode.Definition.Ext2 == 0xCB;
// See OpcodeDefinition.Definitions
if (((y == 6 && (z == 4 || z == 5 || z == 6) || x == 1)) ||
((x == 1 || x == 2) && z == 6) ||
(isCB && (x == 0 && z == 6))
)
{
return(GetHLOrIXIY());
}
throw Errors.AssignedToIllegalOpcode();
}
protected virtual bool IsConditionMet()
{
switch (ExecutionEngine.Opcode.Definition.Y)
{
case 3: // jr d
return(true);
case 4: // jr nz, d
return(!Registers.Flags.Z);
case 5: // jr z, d
return(Registers.Flags.Z);
case 6: // jr nc, d
return(!Registers.Flags.C);
case 7: // jr c, d
return(Registers.Flags.C);
default:
throw Errors.AssignedToIllegalOpcode();
}
}
protected override void OnLastCycleFirstM()
{
switch (ExecutionEngine.Opcode.Definition.Y)
{
case 0: //ld I, A
LoadIntAcc();
break;
case 1: //ld R, A
LoadRefAcc();
break;
case 2: //ld A, I
LoadAccInt();
break;
case 3: //ld A, R
LoadAccRef();
break;
default:
throw Errors.AssignedToIllegalOpcode();
}
}