| Douglas Raillard | 306593d | 2017-02-24 18:14:15 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| dp-arm | fa3cf0b | 2017-05-03 09:38:09 +0100 | [diff] [blame] | 4 | * SPDX-License-Identifier: BSD-3-Clause |
| Douglas Raillard | 306593d | 2017-02-24 18:14:15 +0000 | [diff] [blame] | 5 | */ |
| 6 | |
| Douglas Raillard | 306593d | 2017-02-24 18:14:15 +0000 | [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 | |
| Douglas Raillard | 306593d | 2017-02-24 18:14:15 +0000 | [diff] [blame] | 12 | #define RANDOM_CANARY_VALUE ((u_register_t) 3288484550995823360ULL) |
| 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. As the |
| 19 | * FVP 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 | |