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Disasm.cs
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Disasm.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Emu6502
{
public enum AddressMode
{
Immediate,
ZeroPage,
ZeroPageIndexedX,
ZeroPageIndexedY,
Accumulator,
Absolute,
AbsoluteIndexedX,
AbsoluteIndexedY,
Indirect,
IndexedIndirectX,
IndirectIndexedY,
Implied,
Relative
}
public class Disassembler
{
// TODO: Allow for different "display addreses" versus actual internal addresses to 'data'
public static string Disassemble(IMemory mem, int addr, int count)
{
StringBuilder sb = new StringBuilder();
while (count > 0)
{
int consumed;
if (DisassembleOne(mem, addr, count, sb, out consumed))
{
addr += consumed;
count -= consumed;
}
else
{
DB(sb, addr, mem.Read(addr));
++addr;
--count;
}
}
return sb.ToString();
}
public static void DB(StringBuilder sb, int addr, byte b)
{
sb.AppendFormat("{0:X4} {1:X2} .DB ${1:X2}\r\n", addr, b);
}
public static bool DisassembleOne(IMemory mem, int addr, int count, StringBuilder sb, out int bytesConsumed)
{
bytesConsumed = 0;
if (mem == null)
throw new ArgumentNullException("data");
if (sb == null)
throw new ArgumentNullException("sb");
if (addr < 0 ||
addr > 0xFFFF)
throw new ArgumentOutOfRangeException("addr");
byte opcode = mem.Read(addr);
if (opNames[opcode] == null)
return false;
AddressMode mode = addrModes[opcode];
int byteCount = byteCounts[(int)mode];
if (count < byteCount)
return false;
byte lo = 0, hi = 0;
if (byteCount >= 2)
lo = mem.Read(addr + 1);
if (byteCount == 3)
hi = mem.Read(addr + 2);
if(byteCount == 3)
sb.AppendFormat("{0:X4} {1:X2} {2:X2} {3:X2} {4}", addr, opcode, lo, hi, opNames[opcode]);
else if (byteCount == 2)
sb.AppendFormat("{0:X4} {1:X2} {2:X2} {3}", addr, opcode, lo, opNames[opcode]);
else if (byteCount == 1)
sb.AppendFormat("{0:X4} {1:X2} {2}", addr, opcode, opNames[opcode]);
switch (mode)
{
case AddressMode.Immediate:
sb.AppendFormat(" #${0:X2}", lo);
break;
case AddressMode.ZeroPage:
sb.AppendFormat(" ${0:X2}", lo);
break;
case AddressMode.ZeroPageIndexedX:
sb.AppendFormat(" ${0:X2},X", lo);
break;
case AddressMode.ZeroPageIndexedY:
sb.AppendFormat(" ${0:X2},Y", lo);
break;
case AddressMode.Accumulator:
//sb.AppendFormat(" A", lo);
break;
case AddressMode.Absolute:
sb.AppendFormat(" ${0:X2}{1:X2}", hi, lo);
break;
case AddressMode.AbsoluteIndexedX:
sb.AppendFormat(" ${0:X2}{1:X2},X", hi, lo);
break;
case AddressMode.AbsoluteIndexedY:
sb.AppendFormat(" ${0:X2}{1:X2},Y", hi, lo);
break;
case AddressMode.Indirect:
sb.AppendFormat(" (${0:X2}{1:X2})", hi, lo);
break;
case AddressMode.IndexedIndirectX:
sb.AppendFormat(" (${0:X2},X)", lo);
break;
case AddressMode.IndirectIndexedY:
sb.AppendFormat(" (${0:X2}),Y", lo);
break;
case AddressMode.Implied:
break;
case AddressMode.Relative:
{
int offset = (lo <= 127) ? lo : lo - 256;
int targetAddr = (addr + 2 + offset) & 0xFFFF;
sb.AppendFormat(" ${0:X4}", targetAddr);
}
break;
}
sb.Append("\r\n");
bytesConsumed = byteCount;
return true;
}
// Corresponds to numerical values in AddressMode
private static int[] byteCounts = new int[] {
2, // Immediate
2, // ZeroPage
2, // ZeroPageIndexedX
2, // ZeroPageIndexedY
1, // Accumulator
3, // Absolute
3, // AbsoluteIndexedX
3, // AbsoluteIndexedY
3, // Indirect
2, // IndexedIndirectX
2, // IndirectIndexedY
1, // Implied
2, // Relative
};
private static string[] opNames = new string[] {
/* BEGIN OPNAMES */
"BRK", "ORA", null, null, null, "ORA", "ASL", null,
"PHP", "ORA", "ASL", null, null, "ORA", "ASL", null,
"BPL", "ORA", null, null, null, "ORA", "ASL", null,
"CLC", "ORA", null, null, null, "ORA", "ASL", null,
"JSR", "AND", null, null, "BIT", "AND", "ROL", null,
"PLP", "AND", "ROL", null, "BIT", "AND", "ROL", null,
"BMI", "AND", null, null, null, "AND", "ROL", null,
"SEC", "AND", null, null, null, "AND", "ROL", null,
"RTI", "EOR", null, null, null, "EOR", "LSR", null,
"PHA", "EOR", "LSR", null, "JMP", "EOR", "LSR", null,
"BVC", "EOR", null, null, null, "EOR", "LSR", null,
"CLI", "EOR", null, null, null, "EOR", "LSR", null,
"RTS", "ADC", null, null, null, "ADC", "ROR", null,
"PLA", "ADC", "ROR", null, "JMP", "ADC", "ROR", null,
"BVS", "ADC", null, null, null, "ADC", "ROR", null,
"SEI", "ADC", null, null, null, "ADC", "ROR", null,
null, "STA", null, null, "STY", "STA", "STX", null,
"DEY", null, "TXA", null, "STY", "STA", "STX", null,
"BCC", "STA", null, null, "STY", "STA", "STX", null,
"TYA", "STA", "TXS", null, null, "STA", null, null,
"LDY", "LDA", "LDX", null, "LDY", "LDA", "LDX", null,
"TAY", "LDA", "TAX", null, "LDY", "LDA", "LDX", null,
"BCS", "LDA", null, null, "LDY", "LDA", "LDX", null,
"CLV", "LDA", "TSX", null, "LDY", "LDA", "LDX", null,
"CPY", "CMP", null, null, "CPY", "CMP", "DEC", null,
"INY", "CMP", "DEX", null, "CPY", "CMP", "DEC", null,
"BNE", "CMP", null, null, null, "CMP", "DEC", null,
"CLD", "CMP", null, null, null, "CMP", "DEC", null,
"CPX", "SBC", null, null, "CPX", "SBC", "INC", null,
"INX", "SBC", "NOP", null, "CPX", "SBC", "INC", null,
"BEQ", "SBC", null, null, null, "SBC", "INC", null,
"SED", "SBC", null, null, null, "SBC", "INC", null,
/* END OPNAMES */
};
private static AddressMode[] addrModes = new AddressMode[] {
/* BEGIN MODES */
AddressMode.Implied, AddressMode.IndexedIndirectX, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Immediate, AddressMode.Accumulator, AddressMode.Implied,
AddressMode.Implied, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedX, AddressMode.Implied,
AddressMode.Absolute, AddressMode.IndexedIndirectX, AddressMode.Implied, AddressMode.Implied,
AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Immediate, AddressMode.Accumulator, AddressMode.Implied,
AddressMode.Absolute, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.IndexedIndirectX, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Immediate, AddressMode.Accumulator, AddressMode.Implied,
AddressMode.Absolute, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.IndexedIndirectX, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Immediate, AddressMode.Accumulator, AddressMode.Implied,
AddressMode.Indirect, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.IndexedIndirectX, AddressMode.Implied, AddressMode.Implied,
AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Implied, AddressMode.Implied, AddressMode.Implied,
AddressMode.Absolute, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedY, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedX, AddressMode.Implied, AddressMode.Implied,
AddressMode.Immediate, AddressMode.IndexedIndirectX, AddressMode.Immediate, AddressMode.Implied,
AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Immediate, AddressMode.Implied, AddressMode.Implied,
AddressMode.Absolute, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedY, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedY, AddressMode.Implied,
AddressMode.Immediate, AddressMode.IndexedIndirectX, AddressMode.Implied, AddressMode.Implied,
AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Immediate, AddressMode.Implied, AddressMode.Implied,
AddressMode.Absolute, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedX, AddressMode.Implied,
AddressMode.Immediate, AddressMode.IndexedIndirectX, AddressMode.Implied, AddressMode.Implied,
AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.ZeroPage, AddressMode.Implied,
AddressMode.Implied, AddressMode.Immediate, AddressMode.Implied, AddressMode.Implied,
AddressMode.Absolute, AddressMode.Absolute, AddressMode.Absolute, AddressMode.Implied,
AddressMode.Relative, AddressMode.IndirectIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.ZeroPageIndexedX, AddressMode.ZeroPageIndexedX, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedY, AddressMode.Implied, AddressMode.Implied,
AddressMode.Implied, AddressMode.AbsoluteIndexedX, AddressMode.AbsoluteIndexedX, AddressMode.Implied,
/* END MODES */
};
}
}