| Yann Gautier | 4b0c72a | 2018-07-16 10:54:09 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| Yann Gautier | 4b0c72a | 2018-07-16 10:54:09 +0200 | [diff] [blame] | 7 | #include <stdint.h> |
| 8 | |
| Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 9 | #include <arch_helpers.h> |
| 10 | #include <plat/common/platform.h> |
| 11 | |
| Yann Gautier | 4b0c72a | 2018-07-16 10:54:09 +0200 | [diff] [blame] | 12 | #define RANDOM_CANARY_VALUE 2144346116U |
| 13 | |
| 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. |
| 19 | */ |
| 20 | return RANDOM_CANARY_VALUE ^ (u_register_t)read_cntpct_el0(); |
| 21 | } |
| 22 | |