Initialize thread regs with 0xDEADBEEF.

Also initialize the float regs to NaN.

Core/HLE/sceKernelThread.cpp

@@ -1892,9 +1892,10 @@ void ThreadContext::reset()
 {
 	for (int i = 0; i<32; i++)
 	{
-		r[i] = 0;
-		f[i] = 0.0f;
+		r[i] = 0xDEADBEEF;
+		fi[i] = 0x7f800001;
 	}
+	r[0] = 0;
 	for (int i = 0; i<128; i++)
 	{
 		v[i] = 0.0f;
@@ -1919,15 +1920,13 @@ void ThreadContext::reset()
 	fpcond = 0;
 	fcr0 = 0;
 	fcr31 = 0;
-	hi = 0;
-	lo = 0;
+	hi = 0xDEADBEEF;
+	lo = 0xDEADBEEF;
 }
 
 void __KernelResetThread(Thread *t, int lowestPriority)
 {
 	t->context.reset();
-	t->context.hi = 0;
-	t->context.lo = 0;
 	t->context.pc = t->nt.entrypoint;
 
 	// If the thread would be better than lowestPriority, reset to its initial.  Yes, kinda odd...

Core/HLE/sceKernelThread.h

@@ -114,9 +114,15 @@ struct ThreadContext
 
 	// r must be followed by f.
 	u32 r[32];
-	float f[32];
-
-	float v[128];
+	union {
+		float f[32];
+		u32 fi[32];
+		int fs[32];
+	};
+	union {
+		float v[128];
+		u32 vi[128];
+	};
 	u32 vfpuCtrl[16];
 
 	union {