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e51f5f56dd
This patch restores the kernel keys from current task during cpu resume after the mmu is turned on and ptrauth is enabled. A flag is added in macro ptrauth_keys_install_kernel to check if isb instruction needs to be executed. Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Reviewed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* 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
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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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alternative_if_not ARM64_HAS_ADDRESS_AUTH
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b .Laddr_auth_skip_\@
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alternative_else_nop_endif
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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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ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APIB]
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msr_s SYS_APIBKEYLO_EL1, \tmp2
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msr_s SYS_APIBKEYHI_EL1, \tmp3
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ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APDA]
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msr_s SYS_APDAKEYLO_EL1, \tmp2
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msr_s SYS_APDAKEYHI_EL1, \tmp3
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ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APDB]
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msr_s SYS_APDBKEYLO_EL1, \tmp2
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msr_s SYS_APDBKEYHI_EL1, \tmp3
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.Laddr_auth_skip_\@:
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alternative_if ARM64_HAS_GENERIC_AUTH
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ldp \tmp2, \tmp3, [\tmp1, #PTRAUTH_USER_KEY_APGA]
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msr_s SYS_APGAKEYLO_EL1, \tmp2
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msr_s SYS_APGAKEYHI_EL1, \tmp3
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alternative_else_nop_endif
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.endm
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.macro ptrauth_keys_install_kernel tsk, sync, tmp1, tmp2, tmp3
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alternative_if ARM64_HAS_ADDRESS_AUTH
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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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.if \sync == 1
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isb
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.endif
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alternative_else_nop_endif
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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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.macro ptrauth_keys_install_kernel tsk, sync, 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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