| /* |
| * 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 |
| |
| |
