Android changes

src/Ryujinx.Cpu/Nce/NceExecutionContext.cs

@@ -0,0 +1,174 @@
+using ARMeilleure.State;
+using Ryujinx.Cpu.Signal;
+using Ryujinx.Memory;
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+namespace Ryujinx.Cpu.Nce
+{
+    class NceExecutionContext : IExecutionContext
+    {
+        private const ulong AlternateStackSize = 0x4000;
+
+        private readonly NceNativeContext _context;
+        private readonly ExceptionCallbacks _exceptionCallbacks;
+
+        internal IntPtr NativeContextPtr => _context.BasePtr;
+
+        public ulong Pc => 0UL;
+
+        public long TpidrEl0
+        {
+            get => (long)_context.GetStorage().TpidrEl0;
+            set => _context.GetStorage().TpidrEl0 = (ulong)value;
+        }
+
+        public long TpidrroEl0
+        {
+            get => (long)_context.GetStorage().TpidrroEl0;
+            set => _context.GetStorage().TpidrroEl0 = (ulong)value;
+        }
+
+        public uint Pstate
+        {
+            get => _context.GetStorage().Pstate;
+            set => _context.GetStorage().Pstate = value;
+        }
+
+        public uint Fpcr
+        {
+            get => _context.GetStorage().Fpcr;
+            set => _context.GetStorage().Fpcr = value;
+        }
+
+        public uint Fpsr
+        {
+            get => _context.GetStorage().Fpsr;
+            set => _context.GetStorage().Fpsr = value;
+        }
+
+        public bool IsAarch32
+        {
+            get => false;
+            set
+            {
+                if (value)
+                {
+                    throw new NotSupportedException();
+                }
+            }
+        }
+
+        public bool Running { get; private set; }
+
+        private delegate bool SupervisorCallHandler(int imm);
+        private SupervisorCallHandler _svcHandler;
+
+        private MemoryBlock _alternateStackMemory;
+
+        public NceExecutionContext(ExceptionCallbacks exceptionCallbacks)
+        {
+            _svcHandler = OnSupervisorCall;
+            IntPtr svcHandlerPtr = Marshal.GetFunctionPointerForDelegate(_svcHandler);
+
+            _context = new NceNativeContext();
+
+            ref var storage = ref _context.GetStorage();
+            storage.SvcCallHandler = svcHandlerPtr;
+            storage.InManaged = 1u;
+            storage.CtrEl0 = 0x8444c004; // TODO: Get value from host CPU instead of using guest one?
+
+            Running = true;
+            _exceptionCallbacks = exceptionCallbacks;
+        }
+
+        public ulong GetX(int index) => _context.GetStorage().X[index];
+        public void SetX(int index, ulong value) => _context.GetStorage().X[index] = value;
+
+        public V128 GetV(int index) => _context.GetStorage().V[index];
+        public void SetV(int index, V128 value) => _context.GetStorage().V[index] = value;
+
+        // TODO
+        public bool GetPstateFlag(PState flag) => false;
+        public void SetPstateFlag(PState flag, bool value) { }
+
+        // TODO
+        public bool GetFPstateFlag(FPState flag) => false;
+        public void SetFPstateFlag(FPState flag, bool value) { }
+
+        public void SetStartAddress(ulong address)
+        {
+            ref var storage = ref _context.GetStorage();
+            storage.X[30] = address;
+            storage.HostThreadHandle = NceThreadPal.GetCurrentThreadHandle();
+
+            RegisterAlternateStack();
+        }
+
+        public void Exit()
+        {
+            _context.GetStorage().HostThreadHandle = IntPtr.Zero;
+
+            UnregisterAlternateStack();
+        }
+
+        private void RegisterAlternateStack()
+        {
+            // We need to use an alternate stack to handle the suspend signal,
+            // as the guest stack may be in a state that is not suitable for the signal handlers.
+
+            _alternateStackMemory = new MemoryBlock(AlternateStackSize);
+            NativeSignalHandler.InstallUnixAlternateStackForCurrentThread(_alternateStackMemory.GetPointer(0UL, AlternateStackSize), AlternateStackSize);
+        }
+
+        private void UnregisterAlternateStack()
+        {
+            NativeSignalHandler.UninstallUnixAlternateStackForCurrentThread();
+            _alternateStackMemory.Dispose();
+            _alternateStackMemory = null;
+        }
+
+        public bool OnSupervisorCall(int imm)
+        {
+            _exceptionCallbacks.SupervisorCallback?.Invoke(this, 0UL, imm);
+            return Running;
+        }
+
+        public bool OnInterrupt()
+        {
+            _exceptionCallbacks.InterruptCallback?.Invoke(this);
+            return Running;
+        }
+
+        public void RequestInterrupt()
+        {
+            IntPtr threadHandle = _context.GetStorage().HostThreadHandle;
+            if (threadHandle != IntPtr.Zero)
+            {
+                // Bit 0 set means that the thread is currently running managed code.
+                // Bit 1 set means that an interrupt was requested for the thread.
+                // This, we only need to send the suspend signal if the value was 0 (not running managed code,
+                // and no interrupt was requested before).
+
+                ref uint inManaged = ref _context.GetStorage().InManaged;
+                uint oldValue = Interlocked.Or(ref inManaged, 2);
+
+                if (oldValue == 0)
+                {
+                    NceThreadPal.SuspendThread(threadHandle);
+                }
+            }
+        }
+
+        public void StopRunning()
+        {
+            Running = false;
+        }
+
+        public void Dispose()
+        {
+            _context.Dispose();
+        }
+    }
+}