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82cb2c1ad9
To make software license auditing simpler, use SPDX[0] license identifiers instead of duplicating the license text in every file. NOTE: Files that have been imported by FreeBSD have not been modified. [0]: https://spdx.org/ Change-Id: I80a00e1f641b8cc075ca5a95b10607ed9ed8761a Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
34 lines
980 B
ArmAsm
34 lines
980 B
ArmAsm
/*
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* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <arch.h>
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#include <asm_macros.S>
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#include <assert_macros.S>
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.globl update_stack_protector_canary
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/* -----------------------------------------------------------------------
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* void update_stack_protector_canary(void)
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*
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* Change the value of the canary used for stack smashing attacks protection.
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* Note: This must be called when it is safe to call C code, but this cannot be
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* called by C code. Doing this will make the check fail when the calling
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* function returns.
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* -----------------------------------------------------------------------
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*/
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func update_stack_protector_canary
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/* Use x19 as it is callee-saved */
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mov x19, x30
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bl plat_get_stack_protector_canary
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/* Update the canary with the returned value */
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adrp x1, __stack_chk_guard
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str x0, [x1, #:lo12:__stack_chk_guard]
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ret x19
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endfunc update_stack_protector_canary
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