gdb: Support continue specific threads

src/Ryujinx.HLE/Debugger/Debugger.cs

@@ -411,13 +411,13 @@ namespace Ryujinx.HLE.Debugger
                             break;
                         }
 
-                        if (DebugProcess.GetDebugState() == DebugState.Stopped)
+                        if (DebugProcess.IsThreadPaused(DebugProcess.GetThread(threadId.Value)))
                         {
-                            Reply(ToHex("Stopped"));
+                            Reply(ToHex("Paused"));
                         }
                         else
                         {
-                            Reply(ToHex("Not stopped"));
+                            Reply(ToHex("Running"));
                         }
                         break;
                     }
@@ -625,6 +625,8 @@ namespace Ryujinx.HLE.Debugger
                 threadActionMap[thread.ThreadUid] = new VContPendingAction(VContAction.None);
             }
 
+            VContAction defaultAction = VContAction.None;
+
             // For each inferior thread, the *leftmost* action with a matching thread-id is applied.
             for (int i = rawActions.Length - 1; i >= 0; i--)
             {
@@ -642,6 +644,7 @@ namespace Ryujinx.HLE.Debugger
                     _ => VContAction.None
                 };
 
+                // Note: We don't support signals yet.
                 ushort? signal = null;
                 if (cmd == 'C' || cmd == 'S')
                 {
@@ -666,12 +669,17 @@ namespace Ryujinx.HLE.Debugger
                     {
                         threadActionMap[row.Key] = new VContPendingAction(action, signal);
                     }
+
+                    if (action == VContAction.Continue) {
+                        defaultAction = action;
+                    } else {
+                        Logger.Warning?.Print(LogClass.GdbStub, $"Received vCont command with unsupported default action: {rawAction}");
+                    }
                 }
             }
 
             bool hasError = false;
 
-            // TODO: We don't support stop or continue yet, and we don't support signals.
             foreach (var (threadUid, action) in threadActionMap)
             {
                 if (action.Action == VContAction.Step)
@@ -683,10 +691,20 @@ namespace Ryujinx.HLE.Debugger
                 }
             }
 
-            // If all threads are set to continue, continue the process.
+            // If we receive "vCont;c", just continue the process.
+            // If we receive something like "vCont;c:2e;c:2f" (IDA Pro will send commands like this), continue these threads.
+            // For "vCont;s:2f;c", we only step thread 2f, and do not continue other threads. (Is this correct?)
             if (threadActionMap.Values.All(a => a.Action == VContAction.Continue))
             {
                 DebugProcess.DebugContinue();
+            } else if (defaultAction == VContAction.None) {
+                foreach (var (threadUid, action) in threadActionMap)
+                {
+                    if (action.Action == VContAction.Continue)
+                    {
+                        DebugProcess.DebugContinue(DebugProcess.GetThread(threadUid));
+                    }
+                }
             }
 
             if (hasError)
@@ -716,7 +734,7 @@ namespace Ryujinx.HLE.Debugger
             foreach (var thread in GetThreads())
             {
                 string threadName = System.Security.SecurityElement.Escape(thread.GetThreadName());
-                sb.Append($"<thread id=\"{thread.ThreadUid:x}\" name=\"{threadName}\" />\n");
+                sb.Append($"<thread id=\"{thread.ThreadUid:x}\" name=\"{threadName}\">{(DebugProcess.IsThreadPaused(thread) ? "Paused" : "Running")}</thread>\n");
             }
 
             sb.Append("</threads>");

src/Ryujinx.HLE/Debugger/IDebuggableProcess.cs

@@ -8,9 +8,11 @@ namespace Ryujinx.HLE.Debugger
     {
         void DebugStop();
         void DebugContinue();
+        void DebugContinue(KThread thread);
         bool DebugStep(KThread thread);
         KThread GetThread(ulong threadUid);
         DebugState GetDebugState();
+        bool IsThreadPaused(KThread thread);
         ulong[] GetThreadUids();
         public void DebugInterruptHandler(IExecutionContext ctx);
         IVirtualMemoryManager CpuMemory { get; }

src/Ryujinx.HLE/HOS/Kernel/Process/KProcess.cs

@@ -1257,12 +1257,25 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
                 _kernelContext.CriticalSection.Leave();
             }
 
+            public void DebugContinue(KThread target)
+            {
+                Interlocked.Exchange(ref _parent.debugState, (int)DebugState.Running);
+
+                _kernelContext.CriticalSection.Enter();
+                lock (_parent._threadingLock)
+                {
+                    target.Resume(ThreadSchedState.ThreadPauseFlag);
+                }
+                _kernelContext.CriticalSection.Leave();
+            }
+
             public bool DebugStep(KThread target)
             {
-                if (_parent.debugState != (int)DebugState.Stopped)
+                if (!IsThreadPaused(target))
                 {
                     return false;
                 }
+                
                 _kernelContext.CriticalSection.Enter();
                 steppingThread = target;
                 bool waiting = target.MutexOwner != null || target.WaitingSync || target.WaitingInArbitration;
@@ -1322,6 +1335,11 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
                 return (DebugState)_parent.debugState;
             }
 
+            public bool IsThreadPaused(KThread target)
+            {
+                return (target.SchedFlags & ThreadSchedState.ThreadPauseFlag) != 0;
+            }
+
             public ulong[] GetThreadUids()
             {
                 lock (_parent._threadingLock)