[core] Fix reentrant malloc wrappers

cores/common/base/fixups/malloc.c

@@ -44,10 +44,38 @@ void __wrap_free(void *ptr) {
 	vPortFree(ptr);
 }
 
-__attribute__((alias("__wrap_malloc"))) void *__wrap__malloc_r(void *reent, size_t size);
-__attribute__((alias("__wrap_calloc"))) void *__wrap__calloc_r(void *reent, size_t num, size_t size);
-__attribute__((alias("__wrap_realloc"))) void *__wrap__realloc_r(void *reent, void *ptr, size_t new_size);
-__attribute__((alias("__wrap_free"))) void __wrap__free_r(void *reent, void *ptr);
+// Mind the 'reent' parameter - do NOT define these as linker aliases!
+
+void *__wrap__malloc_r(void *reent, size_t size) {
+	return pvPortMalloc(size);
+}
+
+void *__wrap__calloc_r(void *reent, size_t num, size_t size) {
+	void *ptr;
+	if (num == 0 || size == 0)
+		num = size = 1;
+	ptr = pvPortMalloc(num * size);
+	if (ptr)
+		memset(ptr, 0, num * size);
+	return ptr;
+}
+
+void *__wrap__realloc_r(void *reent, void *ptr, size_t new_size) {
+#if LT_REMALLOC
+	void *nptr = pvPortMalloc(new_size);
+	if (nptr) {
+		memcpy(nptr, ptr, new_size);
+		vPortFree(ptr);
+	}
+	return nptr;
+#else
+	return LT_REALLOC_FUNC(ptr, new_size);
+#endif
+}
+
+void __wrap__free_r(void *reent, void *ptr) {
+	vPortFree(ptr);
+}
 
 #endif