mirror of
https://github.com/openharmony/kernel_linux_common_modules.git
synced 2026-08-27 01:31:36 -04:00
Haryslee
57 lines
1.2 KiB
ArmAsm
57 lines
1.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2023 Huawei Device Co., Ltd.
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*
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* Pointer authentication keys initialisation.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/assembler.h>
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.pushsection ".init.text", "ax"
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.macro ptrauth_key_init type, tmp
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mrs x25, ap\type\()keylo_el1
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str x25, [\tmp]
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mrs x25, ap\type\()keyhi_el1
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str x25, [\tmp, #8]
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.endm
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/* init ptrauth key for kernel backward-edge CFI */
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.macro ptrauth_back_key_init
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mov x6, x5 /* x5: address of init task */
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mov x7, #THREAD_KEYS_KERNEL
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add x6, x6, x7
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add x6, x6, #PTRAUTH_KERNEL_KEY_APIB
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ptrauth_key_init ib, x6
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.endm
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/* init common ptrauth keys for kernel forward-edge CFI, data pointer DFI and data field DFI */
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.macro ptrauth_common_keys_init
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adr_l x7, kernel_common_keys
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mov x6, x7
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add x6, x6, #PTRAUTH_KERNEL_KEY_APIA
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ptrauth_key_init ia, x6
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mov x6, x7
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add x6, x6, #PTRAUTH_KERNEL_KEY_APDA
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ptrauth_key_init da, x6
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mov x6, x7
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add x6, x6, #PTRAUTH_KERNEL_KEY_APDB
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ptrauth_key_init db, x6
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mov x6, x7
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add x6, x6, #PTRAUTH_KERNEL_KEY_APGA
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ptrauth_key_init ga, x6
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.endm
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SYM_CODE_START(ptrauth_kernel_keys_init)
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ptrauth_back_key_init
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ptrauth_common_keys_init
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isb
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ret
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SYM_CODE_END(ptrauth_kernel_keys_init)
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