Diff: mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/device/TOOLCHAIN_GCC_ARM/nuc472_retarget.c

Revision:

18:6a4db94011d3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev/targets/TARGET_NUVOTON/TARGET_NUC472/device/TOOLCHAIN_GCC_ARM/nuc472_retarget.c	Sun May 14 23:18:57 2017 +0000
@@ -0,0 +1,40 @@
+/******************************************************************************
+ * @file     startup_NUC472_442.c
+ * @version  V0.10
+ * $Revision: 11 $
+ * $Date: 15/09/02 10:02a $
+ * @brief    CMSIS Cortex-M4 Core Peripheral Access Layer Source File for NUC472/442 MCU
+ *
+ * @note
+ * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved.
+*****************************************************************************/
+
+#include "NUC472_442.h"
+#include <errno.h>
+#include "nu_miscutil.h"
+
+extern uint32_t __mbed_sbrk_start;
+extern uint32_t __mbed_krbs_start;
+
+#define NU_HEAP_ALIGN       32
+
+/**
+ * The default implementation of _sbrk() (in common/retarget.cpp) for GCC_ARM requires one-region model (heap and stack share one region), which doesn't
+ * fit two-region model (heap and stack are two distinct regions), for example, NUMAKER-PFM-NUC472 locates heap on external SRAM. Define __wrap__sbrk() to
+ * override the default _sbrk(). It is expected to get called through gcc hooking mechanism ('-Wl,--wrap,_sbrk') or in _sbrk().
+ */
+void *__wrap__sbrk(int incr)
+{
+    static uint32_t heap_ind = (uint32_t) &__mbed_sbrk_start;
+    uint32_t heap_ind_old = NU_ALIGN_UP(heap_ind, NU_HEAP_ALIGN);
+    uint32_t heap_ind_new = NU_ALIGN_UP(heap_ind_old + incr, NU_HEAP_ALIGN);
+    
+    if (heap_ind_new > &__mbed_krbs_start) {
+        errno = ENOMEM;
+        return (void *) -1;
+    } 
+    
+    heap_ind = heap_ind_new;
+    
+    return (void *) heap_ind_old;
+}