public CodeDisassemblyForm(NesCore.Console console)
{
InitializeComponent();
this.console = console;
this.processor = console.Processor;
disassemblyLines = new DisassemblyLine[0x10000];
disassemblyLineSource = new string[0x10000];
addressLabels = new string[0x10000];
queuedAddresses = new bool[0x10000];
lastRefresh = DateTime.Now;
needsRefresh = true;
this.disassemblyQueue = new Queue <ushort>();
#if DEBUG
disassemblyTimer.Enabled = false;
#endif
}
private void OnDisassemblyTick(object sender, EventArgs e)
{
int linesToDisassemble = Math.Min(10, disassemblyQueue.Count);
if (linesToDisassemble-- > 0)
{
ushort address = disassemblyQueue.Dequeue();
queuedAddresses[address] = false;
DisassembleLine(address);
}
if (needsRefresh && (DateTime.Now - lastRefresh).TotalSeconds > 5)
{
lastRefresh = DateTime.Now;
SuspendRedraw(disassemblyRichTextBox);
disassemblyRichTextBox.Clear();
for (int address = 0; address < 0x10000; address++)
{
/*
* if (queuedAddresses[address])
* {
* disassemblyRichTextBox.SelectionColor = Color.Gray;
* disassemblyRichTextBox.AppendText("Queued for disassembly...\r\n");
* continue;
* }*/
DisassemblyLine disassemblyLine = disassemblyLines[address];
if (disassemblyLine == null)
{
continue;
}
string label = disassemblyLine.Label;
if (label != null)
{
disassemblyRichTextBox.SelectionColor = Color.Green;
disassemblyRichTextBox.AppendText((label + ":").PadRight(16));
}
else
{
disassemblyRichTextBox.AppendText("".PadRight(16));
}
disassemblyRichTextBox.SelectionColor = Color.DarkRed;
disassemblyRichTextBox.AppendText(disassemblyLine.Address + " ");
disassemblyRichTextBox.SelectionColor = Color.DarkBlue;
disassemblyRichTextBox.AppendText(disassemblyLine.MachineCode.PadRight(12));
disassemblyRichTextBox.SelectionColor = Color.Black;
disassemblyRichTextBox.AppendText(disassemblyLine.Source.PadRight(14));
string remarks = disassemblyLine.Remarks;
if (remarks != null)
{
disassemblyRichTextBox.SelectionColor = Color.Gray;
disassemblyRichTextBox.AppendText("; " + remarks);
}
disassemblyRichTextBox.AppendText("\r\n");
}
ResumeRedraw(disassemblyRichTextBox);
needsRefresh = false;
}
}
private void DisassembleLine(ushort address)
{
if (disassemblyLines[address] != null)
{
return;
}
// prepare main labels
ushort resetVector = processor.ReadWord(Mos6502.ResetVector);
addressLabels[resetVector] = "Start";
ushort irqVector = processor.ReadWord(Mos6502.IrqVector);
addressLabels[irqVector] = "IrqHandler";
ushort nmiVector = processor.ReadWord(Mos6502.NmiVector);
addressLabels[nmiVector] = "NmiHandler";
DisassemblyLine disassemblyLine = new DisassemblyLine();
disassemblyLine.Address = Hex.Format(address);
byte opCode = console.Memory[address];
// determine instruction meta data
Instruction instruction = console.Processor.InstructionSet[opCode];
// machine code
ushort operandAddress = (ushort)(address + 1);
if (instruction.Size == 1)
{
disassemblyLine.MachineCode = Hex.Format(opCode);
}
else if (instruction.Size == 2)
{
disassemblyLine.MachineCode = Hex.Format(opCode)
+ " " + Hex.Format(processor.ReadByte(operandAddress));
}
else // 3
{
disassemblyLine.MachineCode = Hex.Format(opCode)
+ " " + Hex.Format(processor.ReadByte(operandAddress))
+ " " + Hex.Format(processor.ReadByte((ushort)(operandAddress + 1)));
}
// format instruction source
disassemblyLine.Source
= instruction.Name + " " + FormatOperand(operandAddress, instruction.AddressingMode);
// remarks
if (instruction.Name == "RTS")
{
disassemblyLine.Remarks = "- end of subroutine ---------";
}
if (instruction.Name == "RTI")
{
disassemblyLine.Remarks = "- end of interrupt handler --";
}
// if label assigned by forward branching or jumping, assign to new disassembled line
if (addressLabels[address] != null)
{
disassemblyLine.Label = addressLabels[address];
}
// determine labels for relative branching
if (instruction.AddressingMode == AddressingMode.Relative)
{
ushort nextInstructionAddress = (ushort)(address + 2);
sbyte offset = (sbyte)processor.ReadByte(operandAddress);
ushort branchAddress = (ushort)(nextInstructionAddress + offset);
string addressLabel = GetAddressLabel("RelBr", branchAddress);
disassemblyLine.Remarks = "branch to " + addressLabel;
}
// determine labels for absolute jumps
if (instruction.AddressingMode == AddressingMode.Absolute)
{
ushort destAddress = processor.ReadWord(operandAddress);
if (instruction.Name == "JMP")
{
string addressLabel = GetAddressLabel("AbsBr", destAddress);
disassemblyLine.Remarks = "jump to " + addressLabel;
}
else if (instruction.Name == "JSR")
{
string addressLabel = GetAddressLabel("SubRt", destAddress);
disassemblyLine.Remarks = "call subroutine at " + addressLabel;
}
}
disassemblyLines[address] = disassemblyLine;
disassemblyLineSource[address] = disassemblyLine.ToString();
needsRefresh = true;
}