Re: [Xenomai] x86_32 mayday

[Philippe Gerum <rpm@xenomai.org>]

On 06/01/2012 07:28 PM, Jan Kiszka wrote:
> On 2012-06-01 19:16, Gilles Chanteperdrix wrote:
>>
>> Hi,
>>
>> with the current tip of xenomai 2.6 branch, the "sigdebug" test testing
>> the "mayday" code ends up with a segfault on x86_32. I tried to have a
>> look at it, but could not really understand what happens: the register
>> on return from the syscall are ok, but the segfault happens after return
>> from the signal handler, when returning from the interrupted function.
>> It looks like either ebp, or the function return adress are wrong.
>>
>> If anyone wants to have a look at it... Jan maybe?
>
> Can't promise, but will try to find a slot.
>
> I think I didn't test on x86-32 so far. Is this a regression or did you
> run the test for the first time as well?

This could not have worked reliably on x86_32, my bad. We must save 
ss:esp across the mayday transition to return to userland sanely.
I'll be pushing a patch shortly.

-- 
Philippe.