make it possible to change gdb stub settings without destroying/recreating a NDS

src/ARM.cpp

@@ -109,21 +109,13 @@ const u32 ARM::ConditionTable[16] =
 
 ARM::ARM(u32 num, bool jit, std::optional<GDBArgs> gdb, melonDS::NDS& nds) :
 #ifdef GDBSTUB_ENABLED
-    GdbStub(this, gdb ? (num ? gdb->PortARM7 : gdb->PortARM9) : 0),
-    BreakOnStartup(gdb ? (num ? gdb->ARM7BreakOnStartup : gdb->ARM9BreakOnStartup) : false),
+    GdbStub(this),
+    BreakOnStartup(false),
 #endif
     Num(num), // well uh
     NDS(nds)
 {
-#ifdef GDBSTUB_ENABLED
-    if (gdb
-#ifdef JIT_ENABLED
-            && !jit // TODO: Should we support toggling the GdbStub without destroying the ARM?
-#endif
-    )
-        GdbStub.Init();
-    IsSingleStep = false;
-#endif
+    SetGdbArgs(jit ? gdb : std::nullopt);
 }
 
 ARM::~ARM()
@@ -148,6 +140,20 @@ ARMv5::~ARMv5()
     // DTCM is owned by Memory, not going to delete it
 }
 
+void ARM::SetGdbArgs(std::optional<GDBArgs> gdb)
+{
+#ifdef GDBSTUB_ENABLED
+    GdbStub.Close();
+    if (gdb)
+    {
+        int port = Num ? gdb->PortARM7 : gdb->PortARM9;
+        GdbStub.Init(port);
+        BreakOnStartup = Num ? gdb->ARM7BreakOnStartup : gdb->ARM9BreakOnStartup;
+    }
+    IsSingleStep = false;
+#endif
+}
+
 void ARM::Reset()
 {
     Cycles = 0;

src/ARM.h

@@ -68,6 +68,8 @@ public:
     ARM(u32 num, bool jit, std::optional<GDBArgs> gdb, NDS& nds);
     virtual ~ARM(); // destroy shit
 
+    void SetGdbArgs(std::optional<GDBArgs> gdb);
+
     virtual void Reset();
 
     virtual void DoSavestate(Savestate* file);

src/NDS.cpp

@@ -227,6 +227,15 @@ void NDS::SetJITArgs(std::optional<JITArgs> args) noexcept
 }
 #endif
 
+#ifdef GDBSTUB_ENABLED
+void NDS::SetGdbArgs(std::optional<GDBArgs> args) noexcept
+{
+    ARM9.SetGdbArgs(args);
+    ARM7.SetGdbArgs(args);
+    EnableGDBStub = args.has_value();
+}
+#endif
+
 void NDS::InitTimings()
 {
     // TODO, eventually:

src/NDS.h

@@ -476,6 +476,12 @@ public: // TODO: Encapsulate the rest of these members
     void SetJITArgs(std::optional<JITArgs> args) noexcept {}
 #endif
 
+#ifdef GDBSTUB_ENABLED
+    void SetGdbArgs(std::optional<GDBArgs> args) noexcept;
+#else
+    void SetGdbArgs(std::optional<GDBArgs> args) noexcept {}
+#endif
+
 private:
     void InitTimings();
     u32 SchedListMask;

src/debug/GdbStub.cpp

@@ -51,16 +51,17 @@ static int SocketSetBlocking(int fd, bool block)
 namespace Gdb
 {
 
-GdbStub::GdbStub(StubCallbacks* cb, int port)
-	: Cb(cb), Port(port)
+GdbStub::GdbStub(StubCallbacks* cb)
+	: Cb(cb), Port(0)
 	, SockFd(0), ConnFd(0)
 	, Stat(TgtStatus::None), CurBkpt(0), CurWatchpt(0), StatFlag(false), NoAck(false)
 	, ServerSA((void*)new struct sockaddr_in())
 	, ClientSA((void*)new struct sockaddr_in())
 { }
 
-bool GdbStub::Init()
+bool GdbStub::Init(int port)
 {
+    Port = port;
 	Log(LogLevel::Info, "[GDB] initializing GDB stub for core %d on port %d\n",
 		Cb->GetCPU(), Port);
 

src/debug/GdbStub.h

@@ -115,10 +115,10 @@ public:
 		int kind;
 	};
 
-	GdbStub(StubCallbacks* cb, int port);
+	GdbStub(StubCallbacks* cb);
 	~GdbStub();
 
-	bool Init();
+	bool Init(int port);
 	void Close();
 
 	StubState Poll(bool wait = false);

src/frontend/qt_sdl/EmuInstance.cpp

@@ -1362,7 +1362,7 @@ bool EmuInstance::updateConsole() noexcept
         nds->SetARM9BIOS(*args->ARM9BIOS);
         nds->SetFirmware(std::move(args->Firmware));
         nds->SetJITArgs(args->JIT);
-        // TODO GDB stub shit
+        nds->SetGdbArgs(args->GDB);
         nds->SPU.SetInterpolation(args->Interpolation);
         nds->SPU.SetDegrade10Bit(args->BitDepth);