[PATCH v4 07/23] powerpc/8xx: Create C version of kuap_user/kernel_restore() and friends
From: Christophe Leroy <hidden>
Date: 2021-01-25 14:59:25
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
In preparation of porting PPC32 to C syscall entry/exit, create C version of kuap_user_restore() and kuap_kernel_restore() and kuap_check() and kuap_get_and_check() on 8xx Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/include/asm/nohash/32/kup-8xx.h | 27 ++++++++++++++++++++ 1 file changed, 27 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..5ca6c375f767 100644
--- a/arch/powerpc/include/asm/nohash/32/kup-8xx.h
+++ b/arch/powerpc/include/asm/nohash/32/kup-8xx.h@@ -34,6 +34,33 @@ #include <asm/reg.h> +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, kuap); +} + +static inline void kuap_check(void) +{ + if (!IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) + return; + + WARN_ON_ONCE(mfspr(SPRN_MD_AP) >> 16 != MD_APG_KUAP >> 16); +} + +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(mfspr(SPRN_MD_AP) >> 16 != MD_APG_KUAP >> 16); + + return kuap; +} + static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) {
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2.25.0