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Add GDB Stub (ryubing/ryujinx!71)

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See merge request ryubing/ryujinx!71
This commit is contained in:
Coxxs
2025-08-04 20:45:15 -05:00
committed by LotP
parent 324f18aa5f
commit d22756f1bd
58 changed files with 3394 additions and 25 deletions
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149
src/ARMeilleure/Translation/Translator.cs
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@@ -119,7 +119,25 @@ namespace ARMeilleure.Translation
NativeInterface.RegisterThread(context, Memory, this);
if (Optimizations.UseUnmanagedDispatchLoop)
if (Optimizations.EnableDebugging)
{
context.DebugPc = address;
do
{
if (Interlocked.CompareExchange(ref context.ShouldStep, 0, 1) == 1)
{
context.DebugPc = Step(context, context.DebugPc);
context.StepHandler();
}
else
{
context.DebugPc = ExecuteSingle(context, context.DebugPc);
}
context.CheckInterrupt();
}
while (context.Running && context.DebugPc != 0);
}
else if (Optimizations.UseUnmanagedDispatchLoop)
{
Stubs.DispatchLoop(context.NativeContextPtr, address);
}
@@ -175,8 +193,24 @@ namespace ARMeilleure.Translation
return nextAddr;
}
public ulong Step(State.ExecutionContext context, ulong address)
private ulong Step(State.ExecutionContext context, ulong address)
{
try
{
OpCode opCode = Decoder.DecodeOpCode(Memory, address, context.ExecutionMode);
// For branch instructions during single-stepping, we handle them manually
// func.Execute() will sometimes execute the entire function call, which is not what we want
if (opCode.Instruction.Name is InstName.Bl or InstName.Blr or InstName.Blx or InstName.Br)
{
return ExecuteBranchInstructionForStepping(context, address, opCode);
}
}
catch
{
// ignore
}
TranslatedFunction func = Translate(address, context.ExecutionMode, highCq: false, singleStep: true);
address = func.Execute(Stubs.ContextWrapper, context);
@@ -186,6 +220,94 @@ namespace ARMeilleure.Translation
return address;
}
private static ulong ExecuteBranchInstructionForStepping(State.ExecutionContext context, ulong address, OpCode opCode)
{
switch (opCode.Instruction.Name)
{
case InstName.Bl:
if (opCode is IOpCodeBImm opBImm)
{
// Set link register
if (context.ExecutionMode == ExecutionMode.Aarch64)
{
context.SetX(30, address + (ulong)opCode.OpCodeSizeInBytes); // LR = X30
}
else
{
// For ARM32, need to set the appropriate return address
uint returnAddr = opCode is OpCode32 op32 && op32.IsThumb
? (uint)address + (uint)opCode.OpCodeSizeInBytes | 1u // Thumb bit set
: (uint)address + (uint)opCode.OpCodeSizeInBytes;
context.SetX(14, returnAddr); // LR = R14
}
return (ulong)opBImm.Immediate;
}
break;
case InstName.Blr:
if (opCode is OpCodeBReg opBReg)
{
// Set link register
if (context.ExecutionMode == ExecutionMode.Aarch64)
{
context.SetX(30, address + (ulong)opCode.OpCodeSizeInBytes); // LR = X30
}
else
{
uint returnAddr = opCode is OpCode32 op32 && op32.IsThumb
? (uint)address + (uint)opCode.OpCodeSizeInBytes | 1u // Thumb bit set
: (uint)address + (uint)opCode.OpCodeSizeInBytes;
context.SetX(14, returnAddr); // LR = R14
}
return context.GetX(opBReg.Rn);
}
break;
case InstName.Blx:
if (opCode is IOpCodeBImm opBlxImm)
{
// Handle mode switching for BLX
if (opCode is OpCode32 op32)
{
uint returnAddr = op32.IsThumb
? (uint)address + (uint)opCode.OpCodeSizeInBytes | 1u
: (uint)address + (uint)opCode.OpCodeSizeInBytes;
context.SetX(14, returnAddr);
// BLX switches between ARM and Thumb modes
context.SetPstateFlag(PState.TFlag, !op32.IsThumb);
}
return (ulong)opBlxImm.Immediate;
}
else if (opCode is IOpCode32BReg opBlxReg)
{
if (opCode is OpCode32 op32)
{
uint returnAddr = op32.IsThumb
? (uint)address + (uint)opCode.OpCodeSizeInBytes | 1u
: (uint)address + (uint)opCode.OpCodeSizeInBytes;
context.SetX(14, returnAddr);
// For BLX register, the target address determines the mode
ulong targetAddr = context.GetX(opBlxReg.Rm);
context.SetPstateFlag(PState.TFlag, (targetAddr & 1) != 0);
return targetAddr & ~1UL; // Clear the Thumb bit for the actual address
}
}
break;
case InstName.Br:
if (opCode is OpCodeBReg opBr)
{
// BR doesn't set link register, just branches to the target
return context.GetX(opBr.Rn);
}
break;
}
throw new InvalidOperationException($"Unhandled branch instruction: {opCode.Instruction.Name}");
}
internal TranslatedFunction GetOrTranslate(ulong address, ExecutionMode mode)
{
if (!Functions.TryGetValue(address, out TranslatedFunction func))
@@ -367,9 +489,13 @@ namespace ARMeilleure.Translation
if (block.Exit)
{
// Left option here as it may be useful if we need to return to managed rather than tail call in
// future. (eg. for debug)
bool useReturns = false;
// Return to managed rather than tail call.
bool useReturns = Optimizations.EnableDebugging;
if (Optimizations.EnableDebugging)
{
EmitDebugPrecisePcUpdate(context, block.Address);
}
InstEmitFlowHelper.EmitVirtualJump(context, Const(block.Address), isReturn: useReturns);
}
@@ -393,6 +519,11 @@ namespace ARMeilleure.Translation
}
}
if (Optimizations.EnableDebugging)
{
EmitDebugPrecisePcUpdate(context, opCode.Address);
}
Operand lblPredicateSkip = default;
if (context.IsInIfThenBlock && context.CurrentIfThenBlockCond != Condition.Al)
@@ -489,6 +620,14 @@ namespace ARMeilleure.Translation
context.MarkLabel(lblExit);
}
internal static void EmitDebugPrecisePcUpdate(EmitterContext context, ulong address)
{
long debugPrecisePcOffs = NativeContext.GetDebugPrecisePcOffset();
Operand debugPrecisePcAddr = context.Add(context.LoadArgument(OperandType.I64, 0), Const(debugPrecisePcOffs));
context.Store(debugPrecisePcAddr, Const(address));
}
public void InvalidateJitCacheRegion(ulong address, ulong size)
{
ulong[] overlapAddresses = [];