Fork TF-A's libc

Create a fork of "Trusted Firmware-A" libc to be used by
trusted-services SWd components.

URL: https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
SHA: f2735ebccf5173f74c0458736ec526276106097e
Paths: trusted-firmware-a/lib/libc and trusted-firmware-a/include/lib/libc

Signed-off-by: Gabor Ambrus <gabor.ambrus@arm.com>
Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: I2f3b6cbf739265c4441fbba06ea6c9db339022c4
diff --git a/components/common/libc/src/exit.c b/components/common/libc/src/exit.c
new file mode 100644
index 0000000..6de2e93
--- /dev/null
+++ b/components/common/libc/src/exit.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2015-2018, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdlib.h>
+
+static void (*exitfun)(void);
+
+void exit(int status)
+{
+	if (exitfun != NULL)
+		(*exitfun)();
+	for (;;)
+		;
+}
+
+int atexit(void (*fun)(void))
+{
+	if (exitfun != NULL)
+		return -1;
+	exitfun = fun;
+
+	return 0;
+}