public static void Walk(Emu6502 cpu, ushort addr)
{
bool conditional;
byte bytes;
ushort addr2;
HashSet <ushort> branches = new HashSet <ushort>();
while (true)
{
if (seen.Contains(addr))
{
while (true)
{
if (branches.Count == 0)
{
return; // done with walk
}
else
{
addr = branches.First(); // walk a saved address
branches.Remove(addr);
if (!seen.Contains(addr))
{
break;
}
}
}
}
string line;
string dis = cpu.Disassemble(addr, out conditional, out bytes, out addr2, out line);
Console.WriteLine(line);
if (dis != "???")
{
seen.Add(addr);
}
switch (dis)
{
case "BRK":
case "RTI":
case "RTS":
case "???":
if (branches.Count == 0)
{
return; // done with walk
}
else
{
addr = branches.First(); // walk a saved address
branches.Remove(addr);
break;
}
default:
if (!conditional && addr2 != 0)
{
if (dis.StartsWith("JSR"))
{
Walk(cpu, addr2); // walk call recursively, then continue next address
addr += bytes;
}
else
{
addr = addr2;
}
}
else
{
addr += bytes;
if (conditional && !seen.Contains(addr2) && !branches.Contains(addr2))
{
branches.Add(addr2); // save branch address for later
}
}
break;
}
}
}
static void Main(string[] args)
{
// recommend get basic, kernal, etc. ROM files from a emulator such as https://vice-emu.sourceforge.io/index.html#download
Emu6502 cbm = null;
bool error = false;
int ram_size = 0;
Console.Error.WriteLine("6502 Emulator for Windows Console");
Console.Error.WriteLine("C64, VIC-20, PET, TED, ...");
Console.Error.WriteLine("");
Console.Error.WriteLine("simple-emu-c64 version 1.7");
Console.Error.WriteLine("Copyright (c) 2020 David R. Van Wagner");
Console.Error.WriteLine("davevw.com");
Console.Error.WriteLine("Open Source, MIT License");
Console.Error.WriteLine("github.com/davervw/simple-emu-c64");
Console.Error.WriteLine("");
try
{
if (args.Length > 2 && args[1].ToLower() == "ram")
{
ram_size = int.Parse(args[2]) * 1024;
}
if (args.Length == 0 || args[0].ToLower() == "c64")
{
if (ram_size == 0)
{
ram_size = 64 * 1024;
}
if (File.Exists("basic") && File.Exists("kernal") && (!File.Exists("c64\\basic") || !File.Exists("c64\\kernal")))
{
cbm = new EmuC64(ram_size: ram_size, basic_file: "basic", chargen_file: "c64\\chargen", kernal_file: "kernal");
}
else
{
cbm = new EmuC64(ram_size: ram_size, basic_file: "c64\\basic", chargen_file: "c64\\chargen", kernal_file: "c64\\kernal");
}
if ((args.Length == 2 || args.Length == 4) && (File.Exists(args[args.Length - 1]) || File.Exists(args[args.Length - 1] + ".prg")))
{
((EmuC64)cbm).StartupPRG = args[args.Length - 1];
}
}
else if (args.Length > 0 && args[0].ToLower() == "vic20")
{
cbm = new EmuVIC20(ram_size: ram_size, char_file: "vic20\\chargen", basic_file: "vic20\\basic", kernal_file: "vic20\\kernal");
}
else if (args.Length > 0 && args[0].ToLower() == "c16")
{
if (ram_size == 0)
{
ram_size = 16 * 1024;
}
cbm = new EmuTED(ram_size: ram_size, basic_file: "ted\\basic", kernal_file: "ted\\kernal");
}
else if (args.Length > 0 && args[0].ToLower() == "plus4" || args[0].ToLower() == "ted")
{
if (ram_size == 0)
{
ram_size = 64 * 1024;
}
cbm = new EmuTED(ram_size: ram_size, basic_file: "ted\\basic", kernal_file: "ted\\kernal");
}
else if (args.Length > 0 && args[0].ToLower() == "pet")
{
if (ram_size == 0)
{
ram_size = 8 * 1024;
}
cbm = new EmuPET(ram_size: ram_size, basic_file: "pet\\basic1", edit_file: "pet\\edit1g", kernal_file: "pet\\kernal1");
}
else
{
error = true;
}
}
catch (Exception ex)
{
Console.Error.WriteLine(ex.ToString());
error = true;
}
if (error)
{
return;
}
else if (args.Length == 0) // if no arguments present, then show usage as well
{
Console.Error.WriteLine("");
Console.Error.WriteLine("Usage:");
Console.Error.WriteLine(" simple-emu-c64 (no arguments pauses, then starts c64)");
Console.Error.WriteLine(" simple-emu-c64 help (shows usage)");
Console.Error.WriteLine(" simple-emu-c64 [system] {ram #} (system=[c64|vic20|pet|c16|plus4|ted])");
Console.Error.WriteLine(" simple-emu-c64 [system] walk [addr 1 ...]");
Console.Error.WriteLine("");
Console.WriteLine();
}
if (args.Length >= 2 && args[1].ToLower() == "walk")
{
if (args.Length == 2)
{
cbm.Walk();
}
else
{
Walk6502.Reset();
for (int i = 2; i < args.Length; ++i)
{
Walk6502.Walk(cbm, ParseAddr(args[i]));
}
}
}
else
{
cbm.ResetRun();
}
}