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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-06-03 11:41:37 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-16 17:09:07 +0300 |
| commit | 91bb30822a2e1d7900f9f42e9e92647a9015f979 (patch) | |
| tree | 65b175ba7614d99c0cfe3a49a1f4504cca0d7e4a /arch/powerpc/mm/book3s32 | |
| parent | 91ec66719d4c5c0e7b4e32585b01881660d1bc53 (diff) | |
| download | linux-91bb30822a2e1d7900f9f42e9e92647a9015f979.tar.xz | |
powerpc/32s: Refactor update of user segment registers
KUEP implements the update of user segment registers.
Move it into mmu-hash.h in order to use it from other places.
And inline kuep_lock() and kuep_unlock(). Inlining kuep_lock() is
important for system_call_exception(), otherwise system_call_exception()
has to save into stack the system call parameters that are used just
after, and doing that takes more instructions than kuep_lock() itself.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/24591ca480d14a62ef910e38a5273d551262c4a2.1622708530.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm/book3s32')
| -rw-r--r-- | arch/powerpc/mm/book3s32/kuep.c | 37 |
1 files changed, 0 insertions, 37 deletions
diff --git a/arch/powerpc/mm/book3s32/kuep.c b/arch/powerpc/mm/book3s32/kuep.c index 6eafe7b2b031..919595f47e25 100644 --- a/arch/powerpc/mm/book3s32/kuep.c +++ b/arch/powerpc/mm/book3s32/kuep.c @@ -1,43 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-or-later #include <asm/kup.h> -#include <asm/reg.h> -#include <asm/task_size_32.h> -#include <asm/mmu.h> - -#define KUEP_UPDATE_TWO_USER_SEGMENTS(n) do { \ - if (TASK_SIZE > ((n) << 28)) \ - mtsr(val1, (n) << 28); \ - if (TASK_SIZE > (((n) + 1) << 28)) \ - mtsr(val2, ((n) + 1) << 28); \ - val1 = (val1 + 0x222) & 0xf0ffffff; \ - val2 = (val2 + 0x222) & 0xf0ffffff; \ -} while (0) - -static __always_inline void kuep_update(u32 val) -{ - int val1 = val; - int val2 = (val + 0x111) & 0xf0ffffff; - - KUEP_UPDATE_TWO_USER_SEGMENTS(0); - KUEP_UPDATE_TWO_USER_SEGMENTS(2); - KUEP_UPDATE_TWO_USER_SEGMENTS(4); - KUEP_UPDATE_TWO_USER_SEGMENTS(6); - KUEP_UPDATE_TWO_USER_SEGMENTS(8); - KUEP_UPDATE_TWO_USER_SEGMENTS(10); - KUEP_UPDATE_TWO_USER_SEGMENTS(12); - KUEP_UPDATE_TWO_USER_SEGMENTS(14); -} - -void kuep_lock(void) -{ - kuep_update(mfsr(0) | SR_NX); -} - -void kuep_unlock(void) -{ - kuep_update(mfsr(0) & ~SR_NX); -} void __init setup_kuep(bool disabled) { |