[core] Add common malloc() implementation

cores/common/base/fixups/malloc.c

@@ -0,0 +1,68 @@
+/* Copyright (c) Kuba Szczodrzyński 2023-03-03. */
+
+// Generic implementation of malloc() family wrappers for FreeRTOS
+
+#if LT_HAS_FREERTOS
+
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <FreeRTOS.h>
+
+// no such thing in FreeRTOS, but present on most vendor SDKs
+extern void *LT_REALLOC_FUNC(void *pv, size_t xWantedSize);
+
+void *__wrap_malloc(size_t size) {
+	return pvPortMalloc(size);
+}
+
+void *__wrap_calloc(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(void *ptr, size_t new_size) {
+	return LT_REALLOC_FUNC(ptr, new_size);
+}
+
+void __wrap_free(void *ptr) {
+	vPortFree(ptr);
+}
+
+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) {
+	return LT_REALLOC_FUNC(ptr, new_size);
+}
+
+void __wrap__free_r(void *reent, void *ptr) {
+	vPortFree(ptr);
+}
+
+#endif
+
+// Additionally, define zalloc() as a shorthand to calloc() - some implementation use it
+
+void *__wrap_zalloc(size_t size) {
+	return __wrap_calloc(1, size);
+}
+
+__attribute__((alias("__wrap_zalloc"), weak)) void *zalloc(size_t size);