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start disassembler work

This commit is contained in:
ASNiVOR 2024-11-04 14:20:40 +00:00
parent e41b8a4ffe
commit 4c7e3f2a06
3 changed files with 49 additions and 2 deletions
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9
src/BizHawk.Emulation.Cores/CPUs/65x02/vr6502.Disassembler.cs Normal file
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@ -0,0 +1,9 @@
using BizHawk.Emulation.Common;
namespace BizHawk.Emulation.Cores.Components.vr6502
{
public partial class vr6502// : IDisassemblable
{
}
}

15
src/BizHawk.Emulation.Cores/CPUs/65x02/vr6502.Interop.cs
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@ -53,8 +53,21 @@ namespace BizHawk.Emulation.Cores.Components.vr6502
[DllImport(lib, CallingConvention = cc)]
public static extern IntPtr vrEmu6502Int(ref VrEmu6502State state);
/// <summary>
/// Return the mnemonic string for a given opcode
/// </summary>
[DllImport(lib, CallingConvention = cc)]
public static extern IntPtr vrEmu6502OpcodeToMnemonicStr(ref VrEmu6502State state, byte opcode);
/// <summary>
/// Return the address mode for a given opcode
/// </summary>
[DllImport(lib, CallingConvention = cc)]
public static extern IntPtr vrEmu6502GetOpcodeAddrMode(ref VrEmu6502State state, byte opcode);
[DllImport(lib, CallingConvention = cc)]
public static extern ushort vrEmu6502DisassembleInstruction(
ref VrEmu6502State state, ushort addr, int bufferSize, IntPtr buffer,
IntPtr refAddr, IntPtr labelMap);
}
}

27
src/BizHawk.Emulation.Cores/CPUs/65x02/vr6502.cs
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@ -3,7 +3,6 @@ using BizHawk.Common.NumberExtensions;
using BizHawk.Emulation.Common;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using static BizHawk.Emulation.Cores.Components.vr6502.vr6502;
namespace BizHawk.Emulation.Cores.Components.vr6502
{
@ -114,6 +113,32 @@ namespace BizHawk.Emulation.Cores.Components.vr6502
return Marshal.PtrToStringAnsi(strPtr);
}
public string DisassembleInstruction()
{
ushort address = _6502s.currentOpcodeAddr;
int bufferSize = 256;
IntPtr buffer = Marshal.AllocHGlobal(bufferSize);
IntPtr refAddr = Marshal.AllocHGlobal(sizeof(ushort));
IntPtr labelMap = IntPtr.Zero;
try
{
ushort nextAddr = VrEmu6502Interop.vrEmu6502DisassembleInstruction(
ref _6502s, address, bufferSize, buffer, refAddr, labelMap);
string disassembly = Marshal.PtrToStringAnsi(buffer);
ushort referenceAddress = (ushort) Marshal.ReadInt16(refAddr);
return $"Disassembly: {disassembly}, Next Address: {nextAddr}, Reference Address: {referenceAddress}";
}
finally
{
Marshal.FreeHGlobal(buffer);
Marshal.FreeHGlobal(refAddr);
}
}
public IDictionary<string, RegisterValue> GetCpuFlagsAndRegisters()
{
return new Dictionary<string, RegisterValue>