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| author | James Hogan <james.hogan@imgtec.com> | 2017-06-29 11:12:35 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2017-07-11 14:13:06 +0200 |
| commit | becddba9f80f26a2b9ebe9bad2806304ed5e00e1 (patch) | |
| tree | 93e393bee3f3bf46d62e208da2ced0b7022c8605 /arch | |
| parent | MIPS: Negate error syscall return in trace (diff) | |
| download | linux-becddba9f80f26a2b9ebe9bad2806304ed5e00e1.tar.xz linux-becddba9f80f26a2b9ebe9bad2806304ed5e00e1.zip | |
MIPS: Correct forced syscall errors
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: 1d7bf993e073 ("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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/include/asm/syscall.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h index d87882513ee3..7c713025b23f 100644 --- a/arch/mips/include/asm/syscall.h +++ b/arch/mips/include/asm/syscall.h @@ -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; |