[PATCH] fix bz #16169 - CFI directives missing from AArch64 clone.S

[Ryan Arnold]

On Mon, Jan 20, 2014 at 2:08 AM, Tom Tromey <tromey@redhat.com> wrote:
>>>>>> "Ryan" == Ryan Arnold <ryan.arnold@linaro.org> writes:
>
> Ryan> I finally got access to an environment where I could test this and
> Ryan> came up with the same fix you did for cfi_undefined (x30).
>
> Ryan> I ran a modified version of nptl/tst-align2 to hit the error syscall
> Ryan> error path but wasn't able to get gdb to hang as Tom described either
> Ryan> before or after the fix was applied.  I was using ni and bt while
> Ryan> broken inside of __clone. Perhaps that's not how he hit the condition
> Ryan> in the first place, but he'll have to elaborate.
>
> The initial report was here:
>
>     https://sourceware.org/bugzilla/show_bug.cgi?id=16155
>
> You may need to try an older gdb to reproduce the problem; the bug
> causing gdb to hang was fixed in a way that hides the missing CFI
> problem here.  I still think it's correct to add these CFI directives,
> though.
>
> Tom

Thanks Tom,

I think it's the right fix too.

Ryan