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Date: Mon, 02 Dec 2013 10:41:48 +0100
From: Philippe Gerum <rpm@xenomai.org>
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References: <20131128143152.04ac3eab.norbert.bukuli@mediso.hu>	<5297BD30.4060007@xenomai.org>	<20131129094157.3d7202e1.norbert.bukuli@mediso.hu>	<52985E94.4070101@xenomai.org>	<20131129225320.5327838040F@gemini.denx.de>	<20131202095057.175411b7.norbert.bukuli@mediso.hu>	<529C4FAA.9080502@xenomai.org>
 <20131202102455.4a81b5b6.norbert.bukuli@mediso.hu>
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Subject: Re: [Xenomai] test suite programs crash with Illegal instruction on
 MPC5200
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To: Bukuli Norbert <norbert.bukuli@mediso.hu>
Cc: Xenomai <xenomai@xenomai.org>

On 12/02/2013 10:24 AM, Bukuli Norbert wrote:
>
>
> On Mon, 2 Dec 2013 10:15:22 +0100
> Philippe Gerum <rpm@xenomai.org> wrote:
>> On 12/02/2013 09:50 AM, Bukuli Norbert wrote:
>>
>>> Program received signal SIGILL, Illegal instruction.
>>> [Switching to Thread 338]
>>> 0x4800ce74 in ?? ()
>>>
>>> (gdb) bt
>>> #0  0x4800ce74 in ?? ()
>>> #1  0x0ff98534 in ?? ()
>>> #2  0x0fe17a68 in ?? ()
>>> #3  0x480eba4c in ?? ()
>>>
>>> (gdb) info sharedlibrary
>>>   From        To          Syms Read   Shared Object Library
>>> 0x00001ff0  0x0001b014
>>> Yes         /opt/eldk-5.4/powerpc/sysroots/powerpc-linux/lib/ld.so.1
>>> 0x00100360  0x00100648
>>> No          /srv/tftpboot/172.31.2.11/lib/modules/3.8.13/vdso/linux-vdso32.so.1
>>> 0x0ff979b4  0x0ff9e948
>>> No          /opt/eldk-5.4/powerpc/sysroots/powerpc-linux/usr/xenomai/lib/libpthread_rt.so.1
>>
>> For some reason, it looks like the program flow jumps to a weird
>> location. Assuming this backtrace is right, the last location that
>> would make sense seems to be frame #1 at 0x0ff98534 in
>> libpthread_rt.so.1, which is Xenomai's POSIX interface library.
>>
>> - could you please make a full disassembly of libpthread_rt.so.1
>> accessible via pastebin?
>
> Of course. You can find the output of
> $ powerpc-linux-objdump -d libpthread_rt.so.1
> here:
> http://pastebin.com/uywTZGfg
>

Ok, thanks. I will have a look.

>>
>> - we already had these kinds of events a couple of times on different
>> architectures with new gcc releases due to, either broken TLS code
>> generation by gcc, or some weaknesses in our inline syscall
>> trampoline code with respect to expressing constraints. Is
>> --with-__thread enabled when configuring the Xenomai build for
>> libaries and programs?
>>
> Unfortunatelly I do not know exactly. The stock ELDK-5.4 version of
> libpthread_rt.so.1 is used. I will check it up.
>

Please don't bother. From the disassembly you just sent, TLS support is 
not used (--with-__thread disabled).

-- 
Philippe.