276 lines
7.7 KiB
C#
276 lines
7.7 KiB
C#
using System;
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using System.IO;
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using BizHawk.Common;
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using BizHawk.Emulation.Common;
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namespace BizHawk.Emulation.Cores.Components.M6502
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{
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public sealed partial class MOS6502X<TLink> where TLink : IMOS6502XLink
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{
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private readonly TLink _link;
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public MOS6502X(TLink link)
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{
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_link = link;
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InitOpcodeHandlers();
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Reset();
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}
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public bool BCD_Enabled = true;
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public bool debug = false;
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public bool throw_unhandled;
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public void Reset()
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{
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A = 0;
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X = 0;
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Y = 0;
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P = 0x20; // 5th bit always set
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S = 0;
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PC = 0;
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TotalExecutedCycles = 0;
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mi = 0;
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opcode = VOP_RESET;
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iflag_pending = true;
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RDY = true;
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}
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public void NESSoftReset()
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{
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opcode = VOP_RESET;
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mi = 0;
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iflag_pending = true;
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FlagI = true;
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}
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public string TraceHeader
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{
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get { return "6502: PC, machine code, mnemonic, operands, registers (A, X, Y, P, SP), flags (NVTBDIZCR)"; }
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}
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public TraceInfo State(bool disassemble = true)
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{
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if (!disassemble)
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{
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return new TraceInfo {
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Disassembly = "",
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RegisterInfo = ""
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};
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}
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int length;
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string rawbytes = "";
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string disasm = Disassemble(PC, out length);
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for (int i = 0; i < length; i++)
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{
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rawbytes += $" {_link.PeekMemory((ushort)(PC + i)):X2}";
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}
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return new TraceInfo
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{
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Disassembly = $"{PC:X4}: {rawbytes,-9} {disasm} ".PadRight(32),
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RegisterInfo = string.Join(" ",
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$"A:{A:X2}",
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$"X:{X:X2}",
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$"Y:{Y:X2}",
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$"SP:{S:X2}",
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$"P:{P:X2}",
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string.Concat(
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FlagN ? "N" : "n",
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FlagV ? "V" : "v",
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FlagT ? "T" : "t",
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FlagB ? "B" : "b",
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FlagD ? "D" : "d",
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FlagI ? "I" : "i",
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FlagZ ? "Z" : "z",
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FlagC ? "C" : "c"
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// !RDY ? "R" : "r"
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),
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$"Cy:{TotalExecutedCycles}",
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$"PPU-Cy:{ext_ppu_cycle}")
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};
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}
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public bool AtStart { get { return opcode == VOP_Fetch1 || Microcode[opcode][mi] >= Uop.End; } }
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public TraceInfo TraceState()
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{
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// only disassemble when we're at the beginning of an opcode
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return State(AtStart);
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}
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public const ushort NMIVector = 0xFFFA;
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public const ushort ResetVector = 0xFFFC;
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public const ushort BRKVector = 0xFFFE;
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public const ushort IRQVector = 0xFFFE;
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enum ExceptionType
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{
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BRK, NMI, IRQ
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}
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// ==== CPU State ====
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public byte A;
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public byte X;
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public byte Y;
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public byte P;
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public ushort PC;
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public byte S;
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public bool IRQ;
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public bool NMI;
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public bool RDY;
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// ppu cycle (used with SubNESHawk)
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public int ext_ppu_cycle = 0;
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public void SyncState(Serializer ser)
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{
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ser.BeginSection(nameof(MOS6502X));
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ser.Sync(nameof(A), ref A);
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ser.Sync(nameof(X), ref X);
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ser.Sync(nameof(Y), ref Y);
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ser.Sync(nameof(P), ref P);
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ser.Sync(nameof(PC), ref PC);
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ser.Sync(nameof(S), ref S);
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ser.Sync(nameof(NMI), ref NMI);
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ser.Sync(nameof(IRQ), ref IRQ);
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ser.Sync(nameof(RDY), ref RDY);
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ser.Sync(nameof(TotalExecutedCycles), ref TotalExecutedCycles);
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ser.Sync(nameof(opcode), ref opcode);
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ser.Sync(nameof(opcode2), ref opcode2);
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ser.Sync(nameof(opcode3), ref opcode3);
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ser.Sync(nameof(ea), ref ea);
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ser.Sync(nameof(alu_temp), ref alu_temp);
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ser.Sync(nameof(mi), ref mi);
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ser.Sync(nameof(iflag_pending), ref iflag_pending);
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ser.Sync(nameof(interrupt_pending), ref interrupt_pending);
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ser.Sync(nameof(branch_irq_hack), ref branch_irq_hack);
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ser.Sync(nameof(rdy_freeze), ref rdy_freeze);
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ser.Sync(nameof(ext_ppu_cycle), ref ext_ppu_cycle);
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ser.EndSection();
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}
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public void SaveStateBinary(BinaryWriter writer) { SyncState(Serializer.CreateBinaryWriter(writer)); }
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public void LoadStateBinary(BinaryReader reader) { SyncState(Serializer.CreateBinaryReader(reader)); }
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// ==== End State ====
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/// <summary>Carry Flag</summary>
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public bool FlagC
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{
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get { return (P & 0x01) != 0; }
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private set { P = (byte)((P & ~0x01) | (value ? 0x01 : 0x00)); }
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}
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/// <summary>Zero Flag</summary>
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public bool FlagZ
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{
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get { return (P & 0x02) != 0; }
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private set { P = (byte)((P & ~0x02) | (value ? 0x02 : 0x00)); }
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}
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/// <summary>Interrupt Disable Flag</summary>
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public bool FlagI
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{
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get { return (P & 0x04) != 0; }
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set { P = (byte)((P & ~0x04) | (value ? 0x04 : 0x00)); }
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}
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/// <summary>Decimal Mode Flag</summary>
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public bool FlagD
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{
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get { return (P & 0x08) != 0; }
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private set { P = (byte)((P & ~0x08) | (value ? 0x08 : 0x00)); }
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}
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/// <summary>Break Flag</summary>
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public bool FlagB
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{
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get { return (P & 0x10) != 0; }
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private set { P = (byte)((P & ~0x10) | (value ? 0x10 : 0x00)); }
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}
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/// <summary>T... Flag</summary>
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public bool FlagT
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{
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get { return (P & 0x20) != 0; }
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private set { P = (byte)((P & ~0x20) | (value ? 0x20 : 0x00)); }
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}
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/// <summary>Overflow Flag</summary>
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public bool FlagV
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{
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get { return (P & 0x40) != 0; }
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private set { P = (byte)((P & ~0x40) | (value ? 0x40 : 0x00)); }
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}
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/// <summary>Negative Flag</summary>
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public bool FlagN
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{
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get { return (P & 0x80) != 0; }
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private set { P = (byte)((P & ~0x80) | (value ? 0x80 : 0x00)); }
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}
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public long TotalExecutedCycles;
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public ushort ReadWord(ushort address)
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{
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byte l = _link.ReadMemory(address);
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byte h = _link.ReadMemory(++address);
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return (ushort)((h << 8) | l);
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}
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public ushort PeekWord(ushort address)
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{
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byte l = _link.PeekMemory(address);
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byte h = _link.PeekMemory(++address);
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return (ushort)((h << 8) | l);
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}
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private void WriteWord(ushort address, ushort value)
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{
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byte l = (byte)(value & 0xFF);
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byte h = (byte)(value >> 8);
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_link.WriteMemory(address, l);
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_link.WriteMemory(++address, h);
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}
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private ushort ReadWordPageWrap(ushort address)
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{
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ushort highAddress = (ushort)((address & 0xFF00) + ((address + 1) & 0xFF));
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return (ushort)(_link.ReadMemory(address) | (_link.ReadMemory(highAddress) << 8));
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}
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// SO pin
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public void SetOverflow()
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{
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FlagV = true;
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}
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private static readonly byte[] TableNZ =
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{
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0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
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0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80
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};
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}
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}
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