Stub a few services, add support for generating call stacks on the CPU

ChocolArm64/State/AThreadState.cs

@@ -1,5 +1,6 @@
 using ChocolArm64.Events;
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 
 namespace ChocolArm64.State
@@ -56,10 +57,17 @@ namespace ChocolArm64.State
         public event EventHandler<AInstExceptionEventArgs> SvcCall;
         public event EventHandler<AInstUndefinedEventArgs> Undefined;
 
+        private Stack<long> CallStack;
+
         private static Stopwatch TickCounter;
 
         private static double HostTickFreq;
 
+        public AThreadState()
+        {
+            CallStack = new Stack<long>();
+        }
+
         static AThreadState()
         {
             HostTickFreq = 1.0 / Stopwatch.Frequency;
@@ -83,5 +91,27 @@ namespace ChocolArm64.State
         {
             Undefined?.Invoke(this, new AInstUndefinedEventArgs(Position, RawOpCode));
         }
+
+        internal void EnterMethod(long Position)
+        {
+            CallStack.Push(Position);
+        }
+
+        internal void ExitMethod()
+        {
+            CallStack.TryPop(out _);
+        }
+
+        internal void JumpMethod(long Position)
+        {
+            CallStack.TryPop(out _);
+
+            CallStack.Push(Position);
+        }
+
+        public long[] GetCallStack()
+        {
+            return CallStack.ToArray();
+        }
     }
 }