Re: [Xenomai-help] rt_task_shadow returns always -EFAULT

[Jan Kiszka <jan.kiszka@domain.hid>]

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Gilles Chanteperdrix wrote:
> Jan Kiszka wrote:
>> What was the precise brokenness you saw? Also a missing syscall
>> argument initialization? Can you easily reproduce the ARM issue?
>> Would be
> 
> It is here:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38815
> 
> The arm syscalls contain a workaround, I copy the values to some
> temporary variables, but I can not make it work with the bugzilla sample
> (though I am almost sure I tested it when I did it, I may have changed
> toolchain version in the mean time).
> 
> 
>> interesting to know if '+r' makes a difference there, too.
> 
> I tested it after you mention it, and no, it makes no difference.
> 

Meanwhile I also had troubles with the "+r" approach and even more
aspects of the Xen way. But I found a different workaround, see the pull
request.

Also note that even removing all TLS references from rt_task_shadow made
no difference for me. So this was really a different kind of bug than
what you saw on ARM.

Jan


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