public static MacroInstruction GetInstruction(MacroType type, byte opcode)
{
MacroInstruction inst = Invalid;
switch (type)
{
case MacroType.Mesa:
inst = _mesaInstructionTable[opcode];
break;
case MacroType.Lisp:
inst = _lispInstructionTable[opcode];
break;
}
return(inst);
}
private void PrintMesaStatus()
{
int pc = ((((_system.CP.RH[5] & 0xf) << 16) | _system.CP.ALU.R[5]) << 1) | (_system.CP.PC16 ? 1 : 0);
WriteLine(String.Format("Mesa PC=0x{0:x5} (physical address 0x{1:x5})",
pc,
pc >> 1));
StringBuilder stackString = new StringBuilder();
// By convention, R0 is TOS in Mesa.
stackString.AppendFormat("0x{0:x4} ", _system.CP.ALU.R[0]);
for (int i = _system.CP.StackP; i > 0; i--)
{
stackString.AppendFormat("0x{0:x4} ", _system.CP.U[i]);
}
WriteLine(String.Format(" stackP=0x{0:x1} stack: {1}", _system.CP.StackP, stackString));
WriteLine(String.Format(
" ibPtr={0} ibFront=0x{1:x2} ib[0]=0x{2:x2} ib[1]=0x{3:x2}",
_system.CP.IBPtr,
_system.CP.IBFront,
_system.CP.IB[0],
_system.CP.IB[1]));
// Since this breakpoint should always happen the microinstruction after an IBDisp has taken place,
// the TPC is always pointing to the dispatch address for the bytecode, which is not coincidentally
// the bytecode itself. (The value of ibFront that caused the dispatch has since been discarded, or
// we'd use that.)
byte byteCode = (byte)(_system.CP.TPC[(int)TaskType.Emulator]);
MacroInstruction mInst = MacroInstruction.GetInstruction(MacroType.Lisp, byteCode);
string operand = string.Empty;
switch (mInst.Operand)
{
case MacroOperand.None:
// No operands.
break;
case MacroOperand.Byte:
operand = String.Format("0x{0:x2}", _system.CP.IBFront);
break;
case MacroOperand.SignedByte:
operand = String.Format("{0}", (sbyte)_system.CP.IBFront);
break;
case MacroOperand.Pair:
operand = String.Format("0x{0:x1},,0x{1:x1}", _system.CP.IBFront >> 4, _system.CP.IBFront & 0xf);
break;
case MacroOperand.TwoByte:
operand = String.Format("0x{0:x2},,0x{1:x2}",
_system.CP.IBFront,
_system.CP.IBPtr == IBState.Word ? _system.CP.IB[1] : _system.CP.IB[0]);
break;
case MacroOperand.Word:
operand = String.Format("0x{0:x4}",
(_system.CP.IBFront << 8) | (_system.CP.IBPtr == IBState.Word ? _system.CP.IB[1] : _system.CP.IB[0]));
break;
}
WriteLine(String.Format("Bytecode 0x{0:x2} - {1} {2}", byteCode, mInst.Mnemonic, operand));
}
