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MIPS: Sanitize restart logics

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Put the original syscall number into ->regs[0] when we leave syscall
with error.  Use it in restart logics.  Everything else will have
it 0 since we pass through SAVE_SOME on all the ways in.  Note that
in places like bad_stack and inllegal_syscall we leave it 0 - it's not
restartable.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1698/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Al Viro 2010-09-28 18:50:37 +01:00 • committed by Ralf Baechle
parent e5b377a8fb
commit 8f5a00eb42
7 changed files with 34 additions and 35 deletions
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1
arch/mips/kernel/branch.c
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@ -40,7 +40,6 @@ int __compute_return_epc(struct pt_regs *regs)
return -EFAULT;
}
regs->regs[0] = 0;
switch (insn.i_format.opcode) {
/*
* jr and jalr are in r_format format.