diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 15:50:50 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 05:22:11 +0300 |
| commit | 0b45359aa2df7b761817a9664cfb53ea3070c390 (patch) | |
| tree | 3edb02a96c613bd0681b75fc1a069035a9bd5b55 /arch/powerpc/include/asm/nohash/32 | |
| parent | 21eb58ae4fce559d4e025df042db2bc0bb100f93 (diff) | |
| download | linux-0b45359aa2df7b761817a9664cfb53ea3070c390.tar.xz | |
powerpc/8xx: Create C version of kuap save/restore/check helpers
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_assert_locked() and
kuap_get_and_assert_locked() on 8xx.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156a7c4b669d26785391422a5581a1d919544c9a.1615552867.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/include/asm/nohash/32')
| -rw-r--r-- | arch/powerpc/include/asm/nohash/32/kup-8xx.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/nohash/32/kup-8xx.h b/arch/powerpc/include/asm/nohash/32/kup-8xx.h index 17a4a616436f..e6b5ebca47e5 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_assert_locked(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_assert_locked(void) +{ + if (IS_ENABLED(CONFIG_PPC_KUAP_DEBUG)) + kuap_get_and_assert_locked(); +} + static inline void allow_user_access(void __user *to, const void __user *from, unsigned long size, unsigned long dir) { |