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Subject[RFC PATCH v2 02/13] powerpc/32s: Create C version of kuap_restore() and kuap_check()
Date
In preparation of porting PPC32 to C syscall entry/exit,
create C version of kuap_restore() and kuap_check() on book3s/32.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/include/asm/book3s/32/kup.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/arch/powerpc/include/asm/book3s/32/kup.h b/arch/powerpc/include/asm/book3s/32/kup.h
index 3c0ba22dc360..c85bc5b56366 100644
--- a/arch/powerpc/include/asm/book3s/32/kup.h
+++ b/arch/powerpc/include/asm/book3s/32/kup.h
@@ -102,6 +102,27 @@ static inline void kuap_update_sr(u32 sr, u32 addr, u32 end)
isync(); /* Context sync required after mtsrin() */
}

+static inline void kuap_restore(struct pt_regs *regs)
+{
+ u32 kuap = current->thread.kuap;
+ u32 addr = kuap & 0xf0000000;
+ u32 end = kuap << 28;
+
+ if (unlikely(!kuap))
+ return;
+
+ current->thread.kuap = 0;
+ kuap_update_sr(mfsrin(addr) & ~SR_KS, addr, end); /* Clear Ks */
+}
+
+static inline void kuap_check(void)
+{
+ if (!IS_ENABLED(CONFIG_PPC_KUAP_DEBUG))
+ return;
+
+ WARN_ON_ONCE(current->thread.kuap != 0);
+}
+
static __always_inline void allow_user_access(void __user *to, const void __user *from,
u32 size, unsigned long dir)
{
--
2.25.0
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