Target_Nuvoton: Remove target specific implementation of _sbrk

Author: Deepika

targets/TARGET_NUVOTON/TARGET_M2351/device/TOOLCHAIN_GCC_ARM/m2351_retarget.c

@@ -21,24 +21,13 @@
 
 #if defined(TARGET_NUVOTON)
 
-#if defined(__CC_ARM) || (defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050))
+#if defined(__ARMCC_VERSION)
     extern uint32_t               Image$$ARM_LIB_HEAP$$ZI$$Base[];
     extern uint32_t               Image$$ARM_LIB_HEAP$$ZI$$Length[];
-    extern uint32_t               Image$$ARM_LIB_STACK$$ZI$$Base[];
-    extern uint32_t               Image$$ARM_LIB_STACK$$ZI$$Length[];
-    #define HEAP_START            ((unsigned char*) Image$$ARM_LIB_HEAP$$ZI$$Base)
-    #define HEAP_SIZE             ((uint32_t) Image$$ARM_LIB_HEAP$$ZI$$Length)
-    #define ISR_STACK_START       ((unsigned char*)Image$$ARM_LIB_STACK$$ZI$$Base)
-    #define ISR_STACK_SIZE        ((uint32_t)Image$$ARM_LIB_STACK$$ZI$$Length)
+    #define HEAP_START            Image$$ARM_LIB_HEAP$$ZI$$Base
+    #define HEAP_SIZE             Image$$ARM_LIB_HEAP$$ZI$$Length
 #elif defined(__GNUC__)
-    extern uint32_t               __StackTop;
-    extern uint32_t               __StackLimit;
-    extern uint32_t               __end__;
-    extern uint32_t               __HeapLimit;
-    #define HEAP_START            ((unsigned char*) &__end__)
-    #define HEAP_SIZE             ((uint32_t) ((uint32_t) &__HeapLimit - (uint32_t) HEAP_START))
-    #define ISR_STACK_START       ((unsigned char*) &__StackLimit)
-    #define ISR_STACK_SIZE        ((uint32_t)((uint32_t) &__StackTop - (uint32_t) &__StackLimit))
+    /* No region declarations needed */
 #elif defined(__ICCARM__)
     /* No region declarations needed */
 #else