1 /*
2  * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <stdint.h>
8 
9 #include <fvp_r_arch_helpers.h>
10 #include <plat/common/platform.h>
11 
12 #define RANDOM_CANARY_VALUE ((u_register_t) 8092347823957523895ULL)
13 
plat_get_stack_protector_canary(void)14 u_register_t plat_get_stack_protector_canary(void)
15 {
16 	/*
17 	 * Ideally, a random number should be returned instead of the
18 	 * combination of a timer's value and a compile-time constant. As the
19 	 * FVP_R does not have any random number generator, this is better than
20 	 * nothing but not necessarily really secure.
21 	 */
22 	return RANDOM_CANARY_VALUE ^ read_cntpct_el0();
23 }
24 
25