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MIPS: Correct forced syscall errors

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When the system call return value is forced to be an error (for example
due to SECCOMP_RET_ERRNO), syscall_set_return_value() puts the error
code in the return register $v0 and -1 in the error register $a3.

However normally executed system calls put 1 in the error register
rather than -1, so fix syscall_set_return_value() to be consistent with
that.

I don't anticipate that anything would have been broken by this, since
the most natural way to check the error register on MIPS would be a
conditional branch if error register is [not] equal to zero (bnez or
beqz).

Fixes: 1d7bf993e0 ("MIPS: ftrace: Add support for syscall tracepoints.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16652/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan 2017-06-29 10:12:35 +01:00 committed by Ralf Baechle
parent 4f32a39d49
commit becddba9f8
1 changed files with 1 additions and 1 deletions
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2
arch/mips/include/asm/syscall.h
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@ -85,7 +85,7 @@ static inline void syscall_set_return_value(struct task_struct *task,
{
if (error) {
regs->regs[2] = -error;
regs->regs[7] = -1;
regs->regs[7] = 1;
} else {
regs->regs[2] = val;
regs->regs[7] = 0;