[FL-1609] Redirected malloc, calloc, realloc and free functions from newlib to freertos heap. (#604)

* Core: newlib-nano heap management functions replaced with freertos functions
* Core: replace newlib heap management functions for firmware only, not for bootloader
* Core, Linker: automatically determine available heap size at linking.

Co-authored-by: あく <alleteam@gmail.com>

core/furi/memmgr.c

@@ -67,3 +67,22 @@ size_t memmgr_get_free_heap(void) {
 size_t memmgr_get_minimum_free_heap(void) {
     return xPortGetMinimumEverFreeHeapSize();
 }
+
+void* __wrap__malloc_r(struct _reent* r, size_t size) {
+    void* pointer = malloc(size);
+    return pointer;
+}
+
+void __wrap__free_r(struct _reent* r, void* ptr) {
+    free(ptr);
+}
+
+void* __wrap__calloc_r(struct _reent* r, size_t count, size_t size) {
+    void* pointer = calloc(count, size);
+    return pointer;
+}
+
+void* __wrap__realloc_r(struct _reent* r, void* ptr, size_t size) {
+    void* pointer = realloc(ptr, size);
+    return pointer;
+}

core/furi/memmgr_heap.c

@@ -59,14 +59,10 @@ task.h is included from an application file. */
 /* Assumes 8bit bytes! */
 #define heapBITS_PER_BYTE ((size_t)8)
 
-/* Allocate the memory for the heap. */
-#if(configAPPLICATION_ALLOCATED_HEAP == 1)
-/* The application writer has already defined the array used for the RTOS
-    heap - probably so it can be placed in a special segment or address. */
-extern uint8_t ucHeap[configTOTAL_HEAP_SIZE];
-#else
-static uint8_t ucHeap[configTOTAL_HEAP_SIZE];
-#endif /* configAPPLICATION_ALLOCATED_HEAP */
+/* Heap start end symbols provided by linker */
+extern const void __heap_start__;
+extern const void __heap_end__;
+uint8_t* ucHeap = (uint8_t*)&__heap_start__;
 
 /* Define the linked list structure.  This is used to link free blocks in order
 of their memory address. */
@@ -421,7 +417,7 @@ static void prvHeapInit(void) {
     BlockLink_t* pxFirstFreeBlock;
     uint8_t* pucAlignedHeap;
     size_t uxAddress;
-    size_t xTotalHeapSize = configTOTAL_HEAP_SIZE;
+    size_t xTotalHeapSize = (size_t)&__heap_end__ - (size_t)&__heap_start__;
 
     /* Ensure the heap starts on a correctly aligned boundary. */
     uxAddress = (size_t)ucHeap;