private TWord Read(MachineOperand op)
{
var r = op as RegisterOperand;
if (r != null)
{
return(ReadRegister(r.Register));
}
var i = op as ImmediateOperand;
if (i != null)
{
return(i.Value.ToUInt32());
}
var a = op as AddressOperand;
if (a != null)
{
return(a.Address.ToUInt32());
}
var m = op as MemoryOperand;
if (m != null)
{
TWord ea = GetEffectiveAddress(m);
byte b;
switch (op.Width.Size)
{
case 1: if (!img.TryReadByte(Address.Ptr32(ea), out b))
{
throw new IndexOutOfRangeException();
}
else
{
return(b);
}
case 4: return(img.ReadLeUInt32(Address.Ptr32(ea)));
}
throw new NotImplementedException();
}
throw new NotImplementedException();
}