powerpc/32: Prepare for Kernel Userspace Access Protection

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This patch adds ASM macros for saving, restoring and checking
the KUAP state, and modifies setup_32 to call them on exceptions
from kernel.

The macros are defined as empty by default for when CONFIG_PPC_KUAP
is not selected and/or for platforms which don't handle (yet) KUAP.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Christophe Leroy 2019-03-11 08:30:31 +00:00 • committed by Michael Ellerman

parent e291b6d575

commit e2fb9f5444

3 changed files with 27 additions and 6 deletions

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15

arch/powerpc/include/asm/kup.h

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16

arch/powerpc/kernel/entry_32.S

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2

arch/powerpc/platforms/Kconfig.cputype

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