| From | Christophe Leroy <> | Subject | [PATCH v2 42/43] powerpc/8xx: Create C version of kuap save/restore/check helpers | Date | Tue, 9 Mar 2021 12:10:09 +0000 (UTC) |
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In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_save_and_lock() and kuap_user_restore() and kuap_kernel_restore() and kuap_check() and kuap_get_and_check() on 8xx.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- arch/powerpc/include/asm/nohash/32/kup-8xx.h | 31 ++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h index 17a4a616436f..c74f5704bc47 100644 --- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h +++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h @@ -34,6 +34,37 @@ #include <asm/reg.h> +static inline void kuap_save_and_lock(struct pt_regs *regs) +{ + regs->kuap = mfspr(SPRN_MD_AP); + mtspr(SPRN_MD_AP, MD_APG_KUAP); +} + +static inline void kuap_user_restore(struct pt_regs *regs) +{ +} + +static inline void kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap) +{ + mtspr(SPRN_MD_AP, regs->kuap); +} + +static inline unsigned long kuap_get_and_check(void) +{ + unsigned long kuap = mfspr(SPRN_MD_AP); + + if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) + WARN_ON_ONCE(kuap >> 16 != MD_APG_KUAP >> 16); + + return kuap; +} + +static inline void kuap_check(void) +{ + if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) + kuap_get_and_check(); +} + static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { -- 2.25.0
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