On Wed, Sep 18, 2013 at 10:17:48AM +0100, Will Deacon wrote:
> On Tue, Sep 17, 2013 at 10:57:49PM +0100, Jason Gunthorpe wrote:
> > This happens with the latest git head for strace, as well as the 4.7
> > release.
> >
> > Hopefully you can cook up a fix :)
>
> I'll take a look today, thanks.
Ok, looks like the backwards branch to the syscall dispatching logic from
the trace entry is busted. Can you try the patch below please?
I might also take a look at unifying the function prototypes for arm_syscall
and syscall_trace_enter, since it should help us remove some of the argument
shuffling in the trace path.
Will
--->8
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 74ad15d1..bc6bd96 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -442,10 +442,10 @@ local_restart:
ldrcc pc, [tbl, scno, lsl #2] @ call sys_* routine
add r1, sp, #S_OFF
- cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
+2: cmp scno, #(__ARM_NR_BASE - __NR_SYSCALL_BASE)
eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back
bcs arm_syscall
-2: mov why, #0 @ no longer a real syscall
+ mov why, #0 @ no longer a real syscall
b sys_ni_syscall @ not private func
#if defined(CONFIG_OABI_COMPAT) || !defined(CONFIG_AEABI)
--
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