powerpc: Move system_call_exception() to syscall.c

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This is a lead-up patch to enable syscall stack randomization, which
uses alloca() and makes the compiler add unconditional stack canaries
on syscall entry. In order to avoid triggering needless checks and
slowing down the entry path, the feature needs to disable stack
protector at the compilation unit level as there is no general way to
control stack protector coverage with a function attribute.

So move system_call_exception() to syscall.c to avoid affecting other
functions in interrupt.c.

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220701082435.126596-2-xiujianfeng@huawei.com

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Xiu Jianfeng 2022-07-01 16:24:34 +08:00 • committed by Michael Ellerman

parent 978030f054

commit 1547db7d1f

3 changed files with 174 additions and 162 deletions

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2

arch/powerpc/kernel/Makefile

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161

arch/powerpc/kernel/interrupt.c

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173

arch/powerpc/kernel/syscall.c

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