Move most of signal handling to Ryujinx.Cpu project (#6128)

* Move most of signal handling to Ryujinx.Cpu project

* Format whitespace

* Remove unused member

* Format whitespace

* This does not need to be public anymore

1 files changed, 0 insertions, 427 deletions

diff --git a/src/ARMeilleure/Signal/NativeSignalHandler.cs b/src/ARMeilleure/Signal/NativeSignalHandler.cs
deleted file mode 100644
index 31ec16cb..00000000
--- a/src/ARMeilleure/Signal/NativeSignalHandler.cs
+++ /dev/null
@@ -1,427 +0,0 @@
-using ARMeilleure.IntermediateRepresentation;
-using ARMeilleure.Memory;
-using ARMeilleure.Translation;
-using ARMeilleure.Translation.Cache;
-using System;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-using static ARMeilleure.IntermediateRepresentation.Operand.Factory;
-
-namespace ARMeilleure.Signal
-{
-    [StructLayout(LayoutKind.Sequential, Pack = 1)]
-    struct SignalHandlerRange
-    {
-        public int IsActive;
-        public nuint RangeAddress;
-        public nuint RangeEndAddress;
-        public IntPtr ActionPointer;
-    }
-
-    [StructLayout(LayoutKind.Sequential, Pack = 1)]
-    struct SignalHandlerConfig
-    {
-        /// <summary>
-        /// The byte offset of the faulting address in the SigInfo or ExceptionRecord struct.
-        /// </summary>
-        public int StructAddressOffset;
-
-        /// <summary>
-        /// The byte offset of the write flag in the SigInfo or ExceptionRecord struct.
-        /// </summary>
-        public int StructWriteOffset;
-
-        /// <summary>
-        /// The sigaction handler that was registered before this one. (unix only)
-        /// </summary>
-        public nuint UnixOldSigaction;
-
-        /// <summary>
-        /// The type of the previous sigaction. True for the 3 argument variant. (unix only)
-        /// </summary>
-        public int UnixOldSigaction3Arg;
-
-        public SignalHandlerRange Range0;
-        public SignalHandlerRange Range1;
-        public SignalHandlerRange Range2;
-        public SignalHandlerRange Range3;
-        public SignalHandlerRange Range4;
-        public SignalHandlerRange Range5;
-        public SignalHandlerRange Range6;
-        public SignalHandlerRange Range7;
-    }
-
-    public static class NativeSignalHandler
-    {
-        private delegate void UnixExceptionHandler(int sig, IntPtr info, IntPtr ucontext);
-        [UnmanagedFunctionPointer(CallingConvention.Winapi)]
-        private delegate int VectoredExceptionHandler(IntPtr exceptionInfo);
-
-        private const int MaxTrackedRanges = 8;
-
-        private const int StructAddressOffset = 0;
-        private const int StructWriteOffset = 4;
-        private const int UnixOldSigaction = 8;
-        private const int UnixOldSigaction3Arg = 16;
-        private const int RangeOffset = 20;
-
-        private const int EXCEPTION_CONTINUE_SEARCH = 0;
-        private const int EXCEPTION_CONTINUE_EXECUTION = -1;
-
-        private const uint EXCEPTION_ACCESS_VIOLATION = 0xc0000005;
-
-        private static ulong _pageSize;
-        private static ulong _pageMask;
-
-        private static readonly IntPtr _handlerConfig;
-        private static IntPtr _signalHandlerPtr;
-        private static IntPtr _signalHandlerHandle;
-
-        private static readonly object _lock = new();
-        private static bool _initialized;
-
-        static NativeSignalHandler()
-        {
-            _handlerConfig = Marshal.AllocHGlobal(Unsafe.SizeOf<SignalHandlerConfig>());
-            ref SignalHandlerConfig config = ref GetConfigRef();
-
-            config = new SignalHandlerConfig();
-        }
-
-        public static void Initialize(IJitMemoryAllocator allocator)
-        {
-            JitCache.Initialize(allocator);
-        }
-
-        public static void InitializeSignalHandler(ulong pageSize, Func<IntPtr, IntPtr, IntPtr> customSignalHandlerFactory = null)
-        {
-            if (_initialized)
-            {
-                return;
-            }
-
-            lock (_lock)
-            {
-                if (_initialized)
-                {
-                    return;
-                }
-
-                _pageSize = pageSize;
-                _pageMask = pageSize - 1;
-
-                ref SignalHandlerConfig config = ref GetConfigRef();
-
-                if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
-                {
-                    _signalHandlerPtr = Marshal.GetFunctionPointerForDelegate(GenerateUnixSignalHandler(_handlerConfig));
-
-                    if (customSignalHandlerFactory != null)
-                    {
-                        _signalHandlerPtr = customSignalHandlerFactory(UnixSignalHandlerRegistration.GetSegfaultExceptionHandler().sa_handler, _signalHandlerPtr);
-                    }
-
-                    var old = UnixSignalHandlerRegistration.RegisterExceptionHandler(_signalHandlerPtr);
-
-                    config.UnixOldSigaction = (nuint)(ulong)old.sa_handler;
-                    config.UnixOldSigaction3Arg = old.sa_flags & 4;
-                }
-                else
-                {
-                    config.StructAddressOffset = 40; // ExceptionInformation1
-                    config.StructWriteOffset = 32; // ExceptionInformation0
-
-                    _signalHandlerPtr = Marshal.GetFunctionPointerForDelegate(GenerateWindowsSignalHandler(_handlerConfig));
-
-                    if (customSignalHandlerFactory != null)
-                    {
-                        _signalHandlerPtr = customSignalHandlerFactory(IntPtr.Zero, _signalHandlerPtr);
-                    }
-
-                    _signalHandlerHandle = WindowsSignalHandlerRegistration.RegisterExceptionHandler(_signalHandlerPtr);
-                }
-
-                _initialized = true;
-            }
-        }
-
-        private static unsafe ref SignalHandlerConfig GetConfigRef()
-        {
-            return ref Unsafe.AsRef<SignalHandlerConfig>((void*)_handlerConfig);
-        }
-
-        public static unsafe bool AddTrackedRegion(nuint address, nuint endAddress, IntPtr action)
-        {
-            var ranges = &((SignalHandlerConfig*)_handlerConfig)->Range0;
-
-            for (int i = 0; i < MaxTrackedRanges; i++)
-            {
-                if (ranges[i].IsActive == 0)
-                {
-                    ranges[i].RangeAddress = address;
-                    ranges[i].RangeEndAddress = endAddress;
-                    ranges[i].ActionPointer = action;
-                    ranges[i].IsActive = 1;
-
-                    return true;
-                }
-            }
-
-            return false;
-        }
-
-        public static unsafe bool RemoveTrackedRegion(nuint address)
-        {
-            var ranges = &((SignalHandlerConfig*)_handlerConfig)->Range0;
-
-            for (int i = 0; i < MaxTrackedRanges; i++)
-            {
-                if (ranges[i].IsActive == 1 && ranges[i].RangeAddress == address)
-                {
-                    ranges[i].IsActive = 0;
-
-                    return true;
-                }
-            }
-
-            return false;
-        }
-
-        private static Operand EmitGenericRegionCheck(EmitterContext context, IntPtr signalStructPtr, Operand faultAddress, Operand isWrite)
-        {
-            Operand inRegionLocal = context.AllocateLocal(OperandType.I32);
-            context.Copy(inRegionLocal, Const(0));
-
-            Operand endLabel = Label();
-
-            for (int i = 0; i < MaxTrackedRanges; i++)
-            {
-                ulong rangeBaseOffset = (ulong)(RangeOffset + i * Unsafe.SizeOf<SignalHandlerRange>());
-
-                Operand nextLabel = Label();
-
-                Operand isActive = context.Load(OperandType.I32, Const((ulong)signalStructPtr + rangeBaseOffset));
-
-                context.BranchIfFalse(nextLabel, isActive);
-
-                Operand rangeAddress = context.Load(OperandType.I64, Const((ulong)signalStructPtr + rangeBaseOffset + 4));
-                Operand rangeEndAddress = context.Load(OperandType.I64, Const((ulong)signalStructPtr + rangeBaseOffset + 12));
-
-                // Is the fault address within this tracked region?
-                Operand inRange = context.BitwiseAnd(
-                    context.ICompare(faultAddress, rangeAddress, Comparison.GreaterOrEqualUI),
-                    context.ICompare(faultAddress, rangeEndAddress, Comparison.LessUI)
-                    );
-
-                // Only call tracking if in range.
-                context.BranchIfFalse(nextLabel, inRange, BasicBlockFrequency.Cold);
-
-                Operand offset = context.BitwiseAnd(context.Subtract(faultAddress, rangeAddress), Const(~_pageMask));
-
-                // Call the tracking action, with the pointer's relative offset to the base address.
-                Operand trackingActionPtr = context.Load(OperandType.I64, Const((ulong)signalStructPtr + rangeBaseOffset + 20));
-
-                context.Copy(inRegionLocal, Const(0));
-
-                Operand skipActionLabel = Label();
-
-                // Tracking action should be non-null to call it, otherwise assume false return.
-                context.BranchIfFalse(skipActionLabel, trackingActionPtr);
-                Operand result = context.Call(trackingActionPtr, OperandType.I32, offset, Const(_pageSize), isWrite);
-                context.Copy(inRegionLocal, result);
-
-                context.MarkLabel(skipActionLabel);
-
-                // If the tracking action returns false or does not exist, it might be an invalid access due to a partial overlap on Windows.
-                if (OperatingSystem.IsWindows())
-                {
-                    context.BranchIfTrue(endLabel, inRegionLocal);
-
-                    context.Copy(inRegionLocal, WindowsPartialUnmapHandler.EmitRetryFromAccessViolation(context));
-                }
-
-                context.Branch(endLabel);
-
-                context.MarkLabel(nextLabel);
-            }
-
-            context.MarkLabel(endLabel);
-
-            return context.Copy(inRegionLocal);
-        }
-
-        private static Operand GenerateUnixFaultAddress(EmitterContext context, Operand sigInfoPtr)
-        {
-            ulong structAddressOffset = OperatingSystem.IsMacOS() ? 24ul : 16ul; // si_addr
-            return context.Load(OperandType.I64, context.Add(sigInfoPtr, Const(structAddressOffset)));
-        }
-
-        private static Operand GenerateUnixWriteFlag(EmitterContext context, Operand ucontextPtr)
-        {
-            if (OperatingSystem.IsMacOS())
-            {
-                const ulong McontextOffset = 48; // uc_mcontext
-                Operand ctxPtr = context.Load(OperandType.I64, context.Add(ucontextPtr, Const(McontextOffset)));
-
-                if (RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
-                {
-                    const ulong EsrOffset = 8; // __es.__esr
-                    Operand esr = context.Load(OperandType.I64, context.Add(ctxPtr, Const(EsrOffset)));
-                    return context.BitwiseAnd(esr, Const(0x40ul));
-                }
-
-                if (RuntimeInformation.ProcessArchitecture == Architecture.X64)
-                {
-                    const ulong ErrOffset = 4; // __es.__err
-                    Operand err = context.Load(OperandType.I64, context.Add(ctxPtr, Const(ErrOffset)));
-                    return context.BitwiseAnd(err, Const(2ul));
-                }
-            }
-            else if (OperatingSystem.IsLinux())
-            {
-                if (RuntimeInformation.ProcessArchitecture == Architecture.Arm64)
-                {
-                    Operand auxPtr = context.AllocateLocal(OperandType.I64);
-
-                    Operand loopLabel = Label();
-                    Operand successLabel = Label();
-
-                    const ulong AuxOffset = 464; // uc_mcontext.__reserved
-                    const uint EsrMagic = 0x45535201;
-
-                    context.Copy(auxPtr, context.Add(ucontextPtr, Const(AuxOffset)));
-
-                    context.MarkLabel(loopLabel);
-
-                    // _aarch64_ctx::magic
-                    Operand magic = context.Load(OperandType.I32, auxPtr);
-                    // _aarch64_ctx::size
-                    Operand size = context.Load(OperandType.I32, context.Add(auxPtr, Const(4ul)));
-
-                    context.BranchIf(successLabel, magic, Const(EsrMagic), Comparison.Equal);
-
-                    context.Copy(auxPtr, context.Add(auxPtr, context.ZeroExtend32(OperandType.I64, size)));
-
-                    context.Branch(loopLabel);
-
-                    context.MarkLabel(successLabel);
-
-                    // esr_context::esr
-                    Operand esr = context.Load(OperandType.I64, context.Add(auxPtr, Const(8ul)));
-                    return context.BitwiseAnd(esr, Const(0x40ul));
-                }
-
-                if (RuntimeInformation.ProcessArchitecture == Architecture.X64)
-                {
-                    const int ErrOffset = 192; // uc_mcontext.gregs[REG_ERR]
-                    Operand err = context.Load(OperandType.I64, context.Add(ucontextPtr, Const(ErrOffset)));
-                    return context.BitwiseAnd(err, Const(2ul));
-                }
-            }
-
-            throw new PlatformNotSupportedException();
-        }
-
-        private static UnixExceptionHandler GenerateUnixSignalHandler(IntPtr signalStructPtr)
-        {
-            EmitterContext context = new();
-
-            // (int sig, SigInfo* sigInfo, void* ucontext)
-            Operand sigInfoPtr = context.LoadArgument(OperandType.I64, 1);
-            Operand ucontextPtr = context.LoadArgument(OperandType.I64, 2);
-
-            Operand faultAddress = GenerateUnixFaultAddress(context, sigInfoPtr);
-            Operand writeFlag = GenerateUnixWriteFlag(context, ucontextPtr);
-
-            Operand isWrite = context.ICompareNotEqual(writeFlag, Const(0L)); // Normalize to 0/1.
-
-            Operand isInRegion = EmitGenericRegionCheck(context, signalStructPtr, faultAddress, isWrite);
-
-            Operand endLabel = Label();
-
-            context.BranchIfTrue(endLabel, isInRegion);
-
-            Operand unixOldSigaction = context.Load(OperandType.I64, Const((ulong)signalStructPtr + UnixOldSigaction));
-            Operand unixOldSigaction3Arg = context.Load(OperandType.I64, Const((ulong)signalStructPtr + UnixOldSigaction3Arg));
-            Operand threeArgLabel = Label();
-
-            context.BranchIfTrue(threeArgLabel, unixOldSigaction3Arg);
-
-            context.Call(unixOldSigaction, OperandType.None, context.LoadArgument(OperandType.I32, 0));
-            context.Branch(endLabel);
-
-            context.MarkLabel(threeArgLabel);
-
-            context.Call(unixOldSigaction,
-                OperandType.None,
-                context.LoadArgument(OperandType.I32, 0),
-                sigInfoPtr,
-                context.LoadArgument(OperandType.I64, 2)
-                );
-
-            context.MarkLabel(endLabel);
-
-            context.Return();
-
-            ControlFlowGraph cfg = context.GetControlFlowGraph();
-
-            OperandType[] argTypes = new OperandType[] { OperandType.I32, OperandType.I64, OperandType.I64 };
-
-            return Compiler.Compile(cfg, argTypes, OperandType.None, CompilerOptions.HighCq, RuntimeInformation.ProcessArchitecture).Map<UnixExceptionHandler>();
-        }
-
-        private static VectoredExceptionHandler GenerateWindowsSignalHandler(IntPtr signalStructPtr)
-        {
-            EmitterContext context = new();
-
-            // (ExceptionPointers* exceptionInfo)
-            Operand exceptionInfoPtr = context.LoadArgument(OperandType.I64, 0);
-            Operand exceptionRecordPtr = context.Load(OperandType.I64, exceptionInfoPtr);
-
-            // First thing's first - this catches a number of exceptions, but we only want access violations.
-            Operand validExceptionLabel = Label();
-
-            Operand exceptionCode = context.Load(OperandType.I32, exceptionRecordPtr);
-
-            context.BranchIf(validExceptionLabel, exceptionCode, Const(EXCEPTION_ACCESS_VIOLATION), Comparison.Equal);
-
-            context.Return(Const(EXCEPTION_CONTINUE_SEARCH)); // Don't handle this one.
-
-            context.MarkLabel(validExceptionLabel);
-
-            // Next, read the address of the invalid access, and whether it is a write or not.
-
-            Operand structAddressOffset = context.Load(OperandType.I32, Const((ulong)signalStructPtr + StructAddressOffset));
-            Operand structWriteOffset = context.Load(OperandType.I32, Const((ulong)signalStructPtr + StructWriteOffset));
-
-            Operand faultAddress = context.Load(OperandType.I64, context.Add(exceptionRecordPtr, context.ZeroExtend32(OperandType.I64, structAddressOffset)));
-            Operand writeFlag = context.Load(OperandType.I64, context.Add(exceptionRecordPtr, context.ZeroExtend32(OperandType.I64, structWriteOffset)));
-
-            Operand isWrite = context.ICompareNotEqual(writeFlag, Const(0L)); // Normalize to 0/1.
-
-            Operand isInRegion = EmitGenericRegionCheck(context, signalStructPtr, faultAddress, isWrite);
-
-            Operand endLabel = Label();
-
-            // If the region check result is false, then run the next vectored exception handler.
-
-            context.BranchIfTrue(endLabel, isInRegion);
-
-            context.Return(Const(EXCEPTION_CONTINUE_SEARCH));
-
-            context.MarkLabel(endLabel);
-
-            // Otherwise, return to execution.
-
-            context.Return(Const(EXCEPTION_CONTINUE_EXECUTION));
-
-            // Compile and return the function.
-
-            ControlFlowGraph cfg = context.GetControlFlowGraph();
-
-            OperandType[] argTypes = new OperandType[] { OperandType.I64 };
-
-            return Compiler.Compile(cfg, argTypes, OperandType.I32, CompilerOptions.HighCq, RuntimeInformation.ProcessArchitecture).Map<VectoredExceptionHandler>();
-        }
-    }
-}