add noreturn attribute for LOS_Panic LOS_Reboot and HalSysExit

Change-Id: I65bbdd3d60aa754a389f9371649a96483d2a6f8a

kernel/arch/include/los_context.h

@@ -82,7 +82,7 @@ extern VOID *HalTskStackInit(UINT32 taskID, UINT32 stackSize, VOID *topStack);
  * <ul><li>los_hw.h: the header file that contains the API declaration.</li></ul>
  * @see None.
  */
-LITE_OS_SEC_TEXT_MINOR VOID HalSysExit(VOID);
+LITE_OS_SEC_TEXT_MINOR VOID HalSysExit(VOID) NORETURN;
 
 /* *
  * @ingroup  los_context

kernel/include/los_task.h

@@ -501,8 +501,8 @@ extern VOID LOS_Msleep(UINT32 mSecs);
  * @see
  */
 extern UINT32 LOS_Start(VOID);
-extern VOID LOS_Reboot(VOID);
-extern VOID LOS_Panic(const CHAR *fmt, ...);
+extern VOID LOS_Reboot(VOID) NORETURN;
+extern VOID LOS_Panic(const CHAR *fmt, ...) NORETURN;
 
 
 /**

utils/los_compiler.h

@@ -70,6 +70,10 @@ extern "C" {
 #define CLZ           __iar_builtin_CLZ
 #endif
 
+#ifndef NORETURN
+#define NORETURN      __attribute__ ((__noreturn__))
+#endif
+
 /* for ARM Compiler */
 #elif defined(__CC_ARM)
 
@@ -97,6 +101,10 @@ extern "C" {
 #define CLZ           __clz
 #endif
 
+#ifndef NORETURN
+#define NORETURN      __declspec(noreturn)
+#endif
+
 #pragma anon_unions
 
 /* for GNU Compiler */
@@ -126,6 +134,10 @@ extern "C" {
 #define CLZ           __builtin_clz
 #endif
 
+#ifndef NORETURN
+#define NORETURN      __attribute__ ((__noreturn__))
+#endif
+
 #else
 #error Unknown compiler.
 #endif