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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm64/include/asm/asm_pointer_auth.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_ASM_POINTER_AUTH_H

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#define __ASM_ASM_POINTER_AUTH_H

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#include <asm/alternative.h>

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#include <asm/asm-offsets.h>

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#include <asm/cpufeature.h>

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#include <asm/sysreg.h>

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#ifdef CONFIG_ARM64_PTR_AUTH_KERNEL

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	.macro __ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3

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	mov	\tmp1, #THREAD_KEYS_KERNEL

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	add	\tmp1, \tsk, \tmp1

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	ldp	\tmp2, \tmp3, [\tmp1, #PTRAUTH_KERNEL_KEY_APIA]

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	msr_s	SYS_APIAKEYLO_EL1, \tmp2

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	msr_s	SYS_APIAKEYHI_EL1, \tmp3

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	.endm

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	.macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3

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alternative_if ARM64_HAS_ADDRESS_AUTH

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	__ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3

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alternative_else_nop_endif

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	.endm

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	.macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3

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alternative_if ARM64_HAS_ADDRESS_AUTH

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	__ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3

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	isb

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alternative_else_nop_endif

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	.endm

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#else /* CONFIG_ARM64_PTR_AUTH_KERNEL */

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	.macro __ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3

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	.endm

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	.macro ptrauth_keys_install_kernel_nosync tsk, tmp1, tmp2, tmp3

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	.endm

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	.macro ptrauth_keys_install_kernel tsk, tmp1, tmp2, tmp3

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	.endm

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#endif /* CONFIG_ARM64_PTR_AUTH_KERNEL */

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#ifdef CONFIG_ARM64_PTR_AUTH

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/*

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 * thread.keys_user.ap* as offset exceeds the #imm offset range

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 * so use the base value of ldp as thread.keys_user and offset as

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 * thread.keys_user.ap*.

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 */

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	.macro __ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3

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	mov	\tmp1, #THREAD_KEYS_USER

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	add	\tmp1, \tsk, \tmp1

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	ldp	\tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APIA]

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	msr_s	SYS_APIAKEYLO_EL1, \tmp2

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	msr_s	SYS_APIAKEYHI_EL1, \tmp3

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	.endm

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	.macro __ptrauth_keys_init_cpu tsk, tmp1, tmp2, tmp3

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	mrs	\tmp1, id_aa64isar1_el1

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	ubfx	\tmp1, \tmp1, #ID_AA64ISAR1_EL1_APA_SHIFT, #8

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	mrs_s	\tmp2, SYS_ID_AA64ISAR2_EL1

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	ubfx	\tmp2, \tmp2, #ID_AA64ISAR2_EL1_APA3_SHIFT, #4

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	orr	\tmp1, \tmp1, \tmp2

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	cbz	\tmp1, .Lno_addr_auth\@

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	mov_q	\tmp1, (SCTLR_ELx_ENIA | SCTLR_ELx_ENIB | \

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			SCTLR_ELx_ENDA | SCTLR_ELx_ENDB)

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	mrs	\tmp2, sctlr_el1

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	orr	\tmp2, \tmp2, \tmp1

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	msr	sctlr_el1, \tmp2

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	__ptrauth_keys_install_kernel_nosync \tsk, \tmp1, \tmp2, \tmp3

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	isb

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.Lno_addr_auth\@:

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	.endm

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	.macro ptrauth_keys_init_cpu tsk, tmp1, tmp2, tmp3

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alternative_if_not ARM64_HAS_ADDRESS_AUTH

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	b	.Lno_addr_auth\@

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alternative_else_nop_endif

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	__ptrauth_keys_init_cpu \tsk, \tmp1, \tmp2, \tmp3

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.Lno_addr_auth\@:

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	.endm

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#else /* !CONFIG_ARM64_PTR_AUTH */

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	.macro ptrauth_keys_install_user tsk, tmp1, tmp2, tmp3

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	.endm

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#endif /* CONFIG_ARM64_PTR_AUTH */

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#endif /* __ASM_ASM_POINTER_AUTH_H */

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