blob: 19b752588c15fc5905156cc7493a5e722c314a38 [file] [log] [blame]
* 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