[Android] Fix fastmem and enable.

Source/Core/Common/Src/MemArena.cpp

@@ -143,20 +143,20 @@ u8* MemArena::Find4GBBase()
 	return base;
 #else
 #ifdef ANDROID
-	const u32 MemSize = 0x04000000;
+	// Android 4.3 changed how mmap works.
+	// if we map it private and then munmap it, we can't use the base returned.
+	// This may be due to changes in them support a full SELinux implementation.
+	const int flags = MAP_ANON;
 #else
-	const u32 MemSize = 0x31000000; 
+	const int flags = MAP_ANON | MAP_PRIVATE;
 #endif
-	void* base = mmap(0, MemSize, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
+	const u32 MemSize = 0x31000000;
+	void* base = mmap(0, MemSize, PROT_NONE, flags, -1, 0);
 	if (base == MAP_FAILED) {
 		PanicAlert("Failed to map 1 GB of memory space: %s", strerror(errno));
 		return 0;
 	}
-#ifndef ANDROID
-	// Android 4.3 changes how munmap works which causes crashes.
-	// Keep the memory space after allocating it...
 	munmap(base, MemSize);
-#endif
 	return static_cast<u8*>(base);
 #endif
 #endif

Source/Core/Core/Src/PowerPC/JitArm32/JitArm_LoadStore.cpp

@@ -32,7 +32,7 @@
 #include "JitAsm.h"
 
 #ifdef ANDROID
-#define FASTMEM 0
+#define FASTMEM 1
 #else
 #define FASTMEM 1
 #endif
@@ -455,36 +455,40 @@ void JitArm::lhz(UGeckoInstruction inst)
 	// Backpatch route
 	// Gets loaded in to RD
 	// Address is in R10
-	gpr.Unlock(rA, rB);
-	if (inst.RA)
+	if (Core::g_CoreStartupParameter.bFastmem)
 	{
-		ARMReg RA = gpr.R(inst.RA);
-		MOV(R10, RA); // - 4
+		if (inst.RA)
+		{
+			ARMReg RA = gpr.R(inst.RA);
+			MOV(R10, RA); // - 4
+		}
+		else
+			MOV(R10, 0); // - 4
+
+		LoadToReg(RD, R10, 16, (u32)inst.SIMM_16);	
 	}
 	else
-		MOV(R10, 0); // - 4
-
-	LoadToReg(RD, R10, 16, (u32)inst.SIMM_16);	
-#else
-
-	if (inst.RA)
+#endif
 	{
-		MOVI2R(rB, inst.SIMM_16);
-		ARMReg RA = gpr.R(inst.RA);
-		ADD(rB, rB, RA);
+		if (inst.RA)
+		{
+			MOVI2R(rB, inst.SIMM_16);
+			ARMReg RA = gpr.R(inst.RA);
+			ADD(rB, rB, RA);
+		}
+		else	
+			MOVI2R(rB, (u32)inst.SIMM_16);
+
+		MOVI2R(rA, (u32)&Memory::Read_U16);	
+		PUSH(4, R0, R1, R2, R3);
+		MOV(R0, rB);
+		BL(rA);
+		MOV(rA, R0);
+		POP(4, R0, R1, R2, R3);
+		MOV(RD, rA);
 	}
-	else	
-		MOVI2R(rB, (u32)inst.SIMM_16);
-
-	MOVI2R(rA, (u32)&Memory::Read_U16);	
-	PUSH(4, R0, R1, R2, R3);
-	MOV(R0, rB);
-	BL(rA);
-	MOV(rA, R0);
-	POP(4, R0, R1, R2, R3);
-	MOV(RD, rA);
+
 	gpr.Unlock(rA, rB);
-#endif
 	SetJumpTarget(DoNotLoad);
 }
 void JitArm::lha(UGeckoInstruction inst)