Let the GDB stub listen for commands while running

This is needed to send ctrl+C signals while the CPU thread is running.

Source/Core/Core/PowerPC/GDBStub.cpp

@@ -55,6 +55,8 @@ static u32 sig = 0;
 static u32 send_signal = 0;
 static u32 step_break = 0;
 
+static CoreTiming::EventType* m_gdbStubUpdateEvent;
+
 typedef struct
 {
   u32 active;
@@ -114,6 +116,12 @@ static void hex2mem(u8* dst, u8* src, u32 len)
   }
 }
 
+void GDBStubUpdateCallback(u64 userdata, s64 cycles_late)
+{
+  gdb_handle_exception(false);
+  CoreTiming::ScheduleEvent(GDB_UPDATE_CYCLES, m_gdbStubUpdateEvent);
+}
+
 static u8 gdb_read_byte()
 {
   u8 c = '+';
@@ -732,13 +740,20 @@ static void gdb_remove_bp()
   gdb_reply("OK");
 }
 
-void gdb_handle_exception()
+
+void gdb_handle_exception(bool loop_until_continue)
 {
   while (gdb_active())
   {
     if (!gdb_data_available())
+    {
+      if (loop_until_continue)
         continue;
+      else
+        return;
+    }
     gdb_read_command();
+    // No more commands
     if (cmd_len == 0)
       continue;
 
@@ -868,6 +883,9 @@ static void gdb_init_generic(int domain, const sockaddr* server_addr, socklen_t
   close(tmpsock);
 #endif
   tmpsock = -1;
+
+  m_gdbStubUpdateEvent = CoreTiming::RegisterEvent("GDBStubUpdate", GDBStubUpdateCallback);
+  CoreTiming::ScheduleEvent(GDB_UPDATE_CYCLES, m_gdbStubUpdateEvent);
 }
 
 void gdb_deinit()

Source/Core/Core/PowerPC/GDBStub.h

@@ -6,6 +6,7 @@
 #pragma once
 
 #include "Common/CommonTypes.h"
+#include "Core/CoreTiming.h"
 
 #ifndef MSG_WAITALL
 #define MSG_WAITALL (8)
@@ -26,13 +27,17 @@ typedef enum
   GDB_BP_TYPE_A
 } gdb_bp_type;
 
+const s64 GDB_UPDATE_CYCLES = 100000;
+
+void GDBStubUpdateCallback(u64 userdata, s64 cycles_late);
+
 void gdb_init(u32 port);
 void gdb_init_local(const char* socket);
 void gdb_deinit();
 bool gdb_active();
 void gdb_break();
 
-void gdb_handle_exception();
+void gdb_handle_exception(bool loopUntilContinue);
 int gdb_signal(u32 signal);
 
 int gdb_bp_x(u32 addr);
@@ -41,3 +46,6 @@ int gdb_bp_w(u32 addr);
 int gdb_bp_a(u32 addr);
 
 bool gdb_add_bp(u32 type, u32 addr, u32 len);
+void gdb_handle_exception(bool loop_until_continue);
+void SendSignal(u32 signal);
+}  // namespace GDBStub

Source/Core/Core/PowerPC/Interpreter/Interpreter.cpp

@@ -158,7 +158,7 @@ int Interpreter::SingleStepInner()
     Host_UpdateDisasmDialog();
 
     gdb_signal(GDB_SIGTRAP);
-    gdb_handle_exception();
+    gdb_handle_exception(true);
   }
 #endif