1 /*
2  * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <stdint.h>
8 
9 #include <arch_helpers.h>
10 
11 #define RANDOM_CANARY_VALUE ((u_register_t) 3288484550995823360ULL)
12 
plat_get_stack_protector_canary(void)13 u_register_t plat_get_stack_protector_canary(void)
14 {
15 	/*
16 	 * Ideally, a random number should be returned instead of the
17 	 * combination of a timer's value and a compile-time constant. As the
18 	 * FVP does not have any random number generator, this is better than
19 	 * nothing but not necessarily really secure.
20 	 */
21 	return RANDOM_CANARY_VALUE ^ read_cntpct_el0();
22 }
23