public static byte[] DisassembleGetOpcodeBytes(SM83 cpu, ushort address)
{
var opcode = new byte[3];
for (int i = 0; i < opcode.Length; i++)
{
opcode[i] = address + i <= 0xFFFF ? cpu.memoryReadDelegate((ushort)(address + i)) : (byte)0;
}
return(opcode);
}
public static int DisassembleGetOpcodeLen(SM83 cpu, byte[] opcode)
{
if (opcode[0] == 0xCB)
{
return(opcodeLengthPrefixCB[opcode[1]]);
}
else
{
return(opcodeLengthNoPrefix[opcode[0]]);
}
}
public static string DisassembleMakeMnemonicString(SM83 cpu, byte[] opcode)
{
var len = DisassembleGetOpcodeLen(cpu, opcode);
var start = opcode[0] == 0xCB ? 1 : 0;
var mnemonics = opcode[0] == 0xCB ? opcodeMnemonicPrefixCB : opcodeMnemonicNoPrefix;
switch (len - start)
{
case 1: return(mnemonics[opcode[start]]);
case 2: return(string.Format(mnemonics[opcode[start]], opcode[start + 1]));
case 3: return(string.Format(mnemonics[opcode[start]], (opcode[start + 2] << 8 | opcode[start + 1])));
default: return(string.Empty);
}
}
public static string PrintInterrupt(SM83 cpu)
{
var intFlags = (InterruptSource)cpu.memoryReadDelegate(0xFF0F);
var intEnable = (InterruptSource)cpu.memoryReadDelegate(0xFFFF);
var intFlagsString =
$"{((intFlags & InterruptSource.VBlank) != 0 ? "V" : "-")}" +
$"{((intFlags & InterruptSource.LCDCStatus) != 0 ? "L" : "-")}" +
$"{((intFlags & InterruptSource.TimerOverflow) != 0 ? "T" : "-")}" +
$"{((intFlags & InterruptSource.SerialIO) != 0 ? "S" : "-")}" +
$"{((intFlags & InterruptSource.Keypad) != 0 ? "K" : "-")}";
var intEnableString =
$"{((intEnable & InterruptSource.VBlank) != 0 ? "V" : "-")}" +
$"{((intEnable & InterruptSource.LCDCStatus) != 0 ? "L" : "-")}" +
$"{((intEnable & InterruptSource.TimerOverflow) != 0 ? "T" : "-")}" +
$"{((intEnable & InterruptSource.SerialIO) != 0 ? "S" : "-")}" +
$"{((intEnable & InterruptSource.Keypad) != 0 ? "K" : "-")}";
return($"IME:{(cpu.ime ? "1" : "0")} IF:{intFlagsString} IE:{intEnableString}");
}
public static string DisassembleMakeByteString(SM83 cpu, byte[] opcode)
{
return(string.Join(" ", opcode.Select(x => $"{x:X2}").Take(DisassembleGetOpcodeLen(cpu, opcode))));
}
public static string DisassembleOpcode(SM83 cpu, ushort address)
{
var opcode = DisassembleGetOpcodeBytes(cpu, address);
return($"0x{address:X4} | {DisassembleMakeByteString(cpu, opcode).PadRight(15)} | {DisassembleMakeMnemonicString(cpu, opcode)}");
}
public static string PrintFlags(SM83 cpu)
{
return($"{(cpu.IsFlagSet(Flags.Zero) ? "Z" : "-")}{(cpu.IsFlagSet(Flags.Subtract) ? "N" : "-")}{(cpu.IsFlagSet(Flags.HalfCarry) ? "H" : "-")}{(cpu.IsFlagSet(Flags.Carry) ? "C" : "-")}");
}
public static string PrintRegisters(SM83 cpu)
{
return($"AF:{cpu.af.Word:X4} BC:{cpu.bc.Word:X4} DE:{cpu.de.Word:X4} HL:{cpu.hl.Word:X4} SP:{cpu.sp:X4}");
}