1 /* 2 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch_helpers.h> 8 #include <platform.h> 9 #include <stdint.h> 10 11 #define RANDOM_CANARY_VALUE 2144346116U 12 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. 18 */ 19 return RANDOM_CANARY_VALUE ^ (u_register_t)read_cntpct_el0(); 20 } 21 22