blob: c2245d36ade1221617c6430d31271ce3ca6c06a3 [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 x19 as it is callee-saved */
mov x19, x30
bl plat_get_stack_protector_canary
/* Update the canary with the returned value */
adrp x1, __stack_chk_guard
str x0, [x1, #:lo12:__stack_chk_guard]
ret x19
endfunc update_stack_protector_canary