GBA: Exit cleanly on FATAL if the port supports it

CHANGES

@@ -11,6 +11,7 @@ Bugfixes:
  - GBA Memory: Don't call into GPIO write calls if GPIO devices are absent
 Misc:
  - Qt: Disable sync to video by default
+ - GBA: Exit cleanly on FATAL if the port supports it
 
 0.1.0: (2014-12-13)
  - Initial release

src/gba/gba-memory.c

@@ -14,6 +14,7 @@
 #include "util/memory.h"
 
 static uint32_t _popcount32(unsigned bits);
+static uint32_t _deadbeef = 0xDEADBEEF;
 
 static void GBASetActiveRegion(struct ARMCore* cpu, uint32_t region);
 static void GBAMemoryServiceDMA(struct GBA* gba, int number, struct GBADMA* info);
@@ -157,7 +158,7 @@ static void GBASetActiveRegion(struct ARMCore* cpu, uint32_t address) {
 		cpu->memory.activeMask = SIZE_CART0 - 1;
 		break;
 	default:
-		cpu->memory.activeRegion = 0;
+		cpu->memory.activeRegion = &_deadbeef;
 		cpu->memory.activeMask = 0;
 		GBALog(gba, GBA_LOG_FATAL, "Jumped to invalid address");
 		break;

src/gba/gba-thread.c

@@ -357,7 +357,9 @@ void GBAThreadEnd(struct GBAThread* threadContext) {
 		threadContext->debugger->state = DEBUGGER_EXITING;
 	}
 	threadContext->state = THREAD_EXITING;
-	threadContext->gba->cpu->halted = false;
+	if (threadContext->gba) {
+		threadContext->gba->cpu->halted = false;
+	}
 	ConditionWake(&threadContext->stateCond);
 	MutexUnlock(&threadContext->stateMutex);
 	MutexLock(&threadContext->sync.audioBufferMutex);