156 lines
3.9 KiB
C#
156 lines
3.9 KiB
C#
using System;
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using System.Collections.Generic;
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using BizHawk.Emulation.Common;
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namespace BizHawk.Emulation.Cores.Atari.Atari2600
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{
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public partial class Atari2600 : IDebuggable
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{
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public IDictionary<string, RegisterValue> GetCpuFlagsAndRegisters()
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{
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return new Dictionary<string, RegisterValue>
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{
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{ "A", Cpu.A },
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{ "X", Cpu.X },
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{ "Y", Cpu.Y },
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{ "S", Cpu.S },
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{ "PC", Cpu.PC },
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{ "Flag C", Cpu.FlagC },
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{ "Flag Z", Cpu.FlagZ },
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{ "Flag I", Cpu.FlagI },
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{ "Flag D", Cpu.FlagD },
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{ "Flag B", Cpu.FlagB },
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{ "Flag V", Cpu.FlagV },
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{ "Flag N", Cpu.FlagN },
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{ "Flag T", Cpu.FlagT }
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};
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}
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public void SetCpuRegister(string register, int value)
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{
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switch (register)
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{
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default:
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throw new InvalidOperationException();
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case "A":
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Cpu.A = (byte)value;
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break;
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case "X":
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Cpu.X = (byte)value;
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break;
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case "Y":
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Cpu.Y = (byte)value;
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break;
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case "S":
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Cpu.S = (byte)value;
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break;
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case "PC":
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Cpu.PC = (ushort)value;
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break;
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case "Flag I":
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Cpu.FlagI = value > 0;
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break;
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}
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}
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public ITracer Tracer { get; private set; }
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public IMemoryCallbackSystem MemoryCallbacks { get; private set; }
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public bool CanStep(StepType type)
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{
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switch (type)
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{
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case StepType.Into:
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return true;
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default:
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case StepType.Out:
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case StepType.Over:
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return false;
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}
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}
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[FeatureNotImplemented]
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public void Step(StepType type)
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{
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switch (type)
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{
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case StepType.Into:
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StepInto();
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break;
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case StepType.Out:
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throw new NotImplementedException();
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case StepType.Over:
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throw new NotImplementedException();
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}
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}
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private void StepInto()
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{
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var size = opsize[Cpu.PeekMemory(Cpu.PC)];
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for (int i = 0; i < size; i++)
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{
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CycleAdvance();
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}
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}
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//the opsize table is used to quickly grab the instruction sizes (in bytes)
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private readonly byte[] opsize = new byte[]
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{
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/*0x00*/ 1,2,0,0,0,2,2,0,1,2,1,0,0,3,3,0,
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/*0x10*/ 2,2,0,0,0,2,2,0,1,3,0,0,0,3,3,0,
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/*0x20*/ 3,2,0,0,2,2,2,0,1,2,1,0,3,3,3,0,
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/*0x30*/ 2,2,0,0,0,2,2,0,1,3,0,0,0,3,3,0,
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/*0x40*/ 1,2,0,0,0,2,2,0,1,2,1,0,3,3,3,0,
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/*0x50*/ 2,2,0,0,0,2,2,0,1,3,0,0,0,3,3,0,
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/*0x60*/ 1,2,0,0,0,2,2,0,1,2,1,0,3,3,3,0,
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/*0x70*/ 2,2,0,0,0,2,2,0,1,3,0,0,0,3,3,0,
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/*0x80*/ 0,2,0,0,2,2,2,0,1,0,1,0,3,3,3,0,
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/*0x90*/ 2,2,0,0,2,2,2,0,1,3,1,0,0,3,0,0,
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/*0xA0*/ 2,2,2,0,2,2,2,0,1,2,1,0,3,3,3,0,
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/*0xB0*/ 2,2,0,0,2,2,2,0,1,3,1,0,3,3,3,0,
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/*0xC0*/ 2,2,0,0,2,2,2,0,1,2,1,0,3,3,3,0,
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/*0xD0*/ 2,2,0,0,0,2,2,0,1,3,0,0,0,3,3,0,
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/*0xE0*/ 2,2,0,0,2,2,2,0,1,2,1,0,3,3,3,0,
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/*0xF0*/ 2,2,0,0,0,2,2,0,1,3,0,0,0,3,3,0
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};
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/*the optype table is a quick way to grab the addressing mode for any 6502 opcode
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//
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// 0 = Implied\Accumulator\Immediate\Branch\NULL
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// 1 = (Indirect,X)
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// 2 = Zero Page
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// 3 = Absolute
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// 4 = (Indirect),Y
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// 5 = Zero Page,X
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// 6 = Absolute,Y
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// 7 = Absolute,X
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// 8 = Zero Page,Y
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*/
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private readonly byte[] optype = new byte[]
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{
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/*0x00*/ 0,1,0,0,0,2,2,0,0,0,0,0,0,3,3,0,
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/*0x10*/ 0,4,0,0,0,5,5,0,0,6,0,0,0,7,7,0,
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/*0x20*/ 0,1,0,0,2,2,2,0,0,0,0,0,3,3,3,0,
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/*0x30*/ 0,4,0,0,0,5,5,0,0,6,0,0,0,7,7,0,
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/*0x40*/ 0,1,0,0,0,2,2,0,0,0,0,0,0,3,3,0,
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/*0x50*/ 0,4,0,0,0,5,5,0,0,6,0,0,0,7,7,0,
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/*0x60*/ 0,1,0,0,0,2,2,0,0,0,0,0,3,3,3,0,
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/*0x70*/ 0,4,0,0,0,5,5,0,0,6,0,0,0,7,7,0,
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/*0x80*/ 0,1,0,0,2,2,2,0,0,0,0,0,3,3,3,0,
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/*0x90*/ 0,4,0,0,5,5,8,0,0,6,0,0,0,7,0,0,
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/*0xA0*/ 0,1,0,0,2,2,2,0,0,0,0,0,3,3,3,0,
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/*0xB0*/ 0,4,0,0,5,5,8,0,0,6,0,0,7,7,6,0,
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/*0xC0*/ 0,1,0,0,2,2,2,0,0,0,0,0,3,3,3,0,
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/*0xD0*/ 0,4,0,0,0,5,5,0,0,6,0,0,0,7,7,0,
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/*0xE0*/ 0,1,0,0,2,2,2,0,0,0,0,0,3,3,3,0,
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/*0xF0*/ 0,4,0,0,0,5,5,0,0,6,0,0,0,7,7,0
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};
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}
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}
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