| /* | |
| * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. | |
| * | |
| * SPDX-License-Identifier: BSD-3-Clause | |
| */ | |
| #include <arch.h> | |
| #include <asm_macros.S> | |
| #include <assert_macros.S> | |
| .globl update_stack_protector_canary | |
| /* ----------------------------------------------------------------------- | |
| * void update_stack_protector_canary(void) | |
| * | |
| * Change the value of the canary used for stack smashing attacks protection. | |
| * Note: This must be called when it is safe to call C code, but this cannot be | |
| * called by C code. Doing this will make the check fail when the calling | |
| * function returns. | |
| * ----------------------------------------------------------------------- | |
| */ | |
| func update_stack_protector_canary | |
| /* Use r4 as it is callee-saved */ | |
| mov r4, lr | |
| bl plat_get_stack_protector_canary | |
| /* Update the canary with the returned value */ | |
| ldr r1, =__stack_chk_guard | |
| str r0, [r1] | |
| bx r4 | |
| endfunc update_stack_protector_canary | |