Add clobber lists to inline asm code.

Source/portable/GCC/ARM_CM3_MPU/port.c

@@ -149,7 +149,7 @@ static void prvRestoreContextOfFirstTask( void ) __attribute__(( naked )) PRIVIL
  * C portion of the SVC handler.  The SVC handler is split between an asm entry
  * and a C wrapper for simplicity of coding and maintenance.
  */
-static void prvSVCHandler(	unsigned long *pulRegisters ) __attribute__ ((optimize("3"))) PRIVILEGED_FUNCTION;
+static void prvSVCHandler( unsigned long *pulRegisters ) __attribute__(( noinline )) PRIVILEGED_FUNCTION;
 
 /*-----------------------------------------------------------*/
 
@@ -196,6 +196,7 @@ void vPortSVCHandler( void )
 			"	mrs r0, psp						\n"
 		#endif
 			"	b prvSVCHandler					\n"
+			:::"r0"
 	);
 
 	/* This will never get executed, but is required to prevent prvSVCHandler
@@ -225,6 +226,7 @@ unsigned char ucSVCNumber;
 												"	mrs r1, control		\n" /* Obtain current control value. */
 												"	bic r1, #1			\n" /* Set privilege bit. */
 												"	msr control, r1		\n" /* Write back new control value. */
+												:::"r1"
 											);
 											break;
 

Source/portable/GCC/ARM_CM3_MPU/portmacro.h

@@ -103,7 +103,7 @@ extern "C" {
 #define portNUM_CONFIGURABLE_REGIONS		( ( portLAST_CONFIGURABLE_REGION - portFIRST_CONFIGURABLE_REGION ) + 1 )
 #define portTOTAL_NUM_REGIONS				( portNUM_CONFIGURABLE_REGIONS + 1 ) /* Plus one to make space for the stack region. */
 
-#define portSWITCH_TO_USER_MODE() __asm volatile ( " mrs r0, control \n orr r0, #1 \n msr control, r0 " )
+#define portSWITCH_TO_USER_MODE() __asm volatile ( " mrs r0, control \n orr r0, #1 \n msr control, r0 " :::"r0" )
 
 typedef struct MPU_REGION_REGISTERS
 {