llvm dev - Jul 2009 - [LLVMdev] ARM cross compiling causes segmentation fault

Hello,

I built a llvm toolchain for ARM and I'm trying to build a simple
application on ARM using LLVM. When I compiled the code, it has the
following message and the binary code has a segmentation fault when it is
executed.

/tmp/ccJPjMe4.s: Assembler messages:
/tmp/ccJPjMe4.s:4250: rdhi, rdlo and rm must all be different
/tmp/ccJPjMe4.s:4589: rdhi, rdlo and rm must all be different
/tmp/ccJPjMe4.s:4694: rdhi, rdlo and rm must all be different
/tmp/ccJPjMe4.s:4899: rdhi, rdlo and rm must all be different
/tmp/ccJPjMe4.s:4915: rdhi, rdlo and rm must all be different

Any idea?

Regards,
Won
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On Jul 8, 2009, at 11:04 AMPDT, Won J Jeon wrote:
> Hello,
>
> I built a llvm toolchain for ARM and I'm trying to build a simple  
> application on ARM using LLVM. When I compiled the code, it has the  
> following message and the binary code has a segmentation fault when  
> it is executed.
>
> /tmp/ccJPjMe4.s: Assembler messages:
> /tmp/ccJPjMe4.s:4250: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4589: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4694: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4899: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4915: rdhi, rdlo and rm must all be different
Make sure you've told the compiler the correct version of ARM;  
different generations of the architecture have different restrictions  
of this sort.
Look at the .s file to see what instruction it's complaining about.   
(MUL had such a restriction in early versions of ARM, but I'd expect  
the message to read differently if that's it.)
If you've told the compiler the right version of ARM and you think the  
compiler is wrong, file a bug with reproducible example.

I tried a couple of options (-mcpu=arm1136j-s, -mcpu=arm1136jf-s,
-march=armv6, ...) to let the compile know the specific ARM processor, but
the same issue is still there. I tried to take a look at .s file in /tmp
directory, but it's already cleaned up. Is it because I enabled the
optimization option when I compiled llvm?

Regards,
Won

On Wed, Jul 8, 2009 at 1:28 PM, Dale Johannesen <dalej at apple.com>
wrote:
>
> On Jul 8, 2009, at 11:04 AMPDT, Won J Jeon wrote:
>
> > Hello,
> >
> > I built a llvm toolchain for ARM and I'm trying to build a simple
> > application on ARM using LLVM. When I compiled the code, it has the
> > following message and the binary code has a segmentation fault when
> > it is executed.
> >
> > /tmp/ccJPjMe4.s: Assembler messages:
> > /tmp/ccJPjMe4.s:4250: rdhi, rdlo and rm must all be different
> > /tmp/ccJPjMe4.s:4589: rdhi, rdlo and rm must all be different
> > /tmp/ccJPjMe4.s:4694: rdhi, rdlo and rm must all be different
> > /tmp/ccJPjMe4.s:4899: rdhi, rdlo and rm must all be different
> > /tmp/ccJPjMe4.s:4915: rdhi, rdlo and rm must all be different
>
> Make sure you've told the compiler the correct version of ARM;
> different generations of the architecture have different restrictions
> of this sort.
> Look at the .s file to see what instruction it's complaining about.
> (MUL had such a restriction in early versions of ARM, but I'd expect
> the message to read differently if that's it.)
> If you've told the compiler the right version of ARM and you think the
> compiler is wrong, file a bug with reproducible example.
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
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These messages are from the Code Sourcery assembler in toolchain
2007q3 (which I presume you are using). We have been living with these
warnings for quite sometime now and have proven to be harmless on v6
and may be ignored [Refer:
http://www.mail-archive.com/linux-omap at vger.kernel.org/msg00059.html].

This bug has been fixed in the assembler that is part of 2008q3 toolchain.

Hope that helps.

Bharadwaj

On Wed, Jul 8, 2009 at 2:04 PM, Won J Jeon<wjjeon at gmail.com>
wrote:
> Hello,
>
> I built a llvm toolchain for ARM and I'm trying to build a simple
> application on ARM using LLVM. When I compiled the code, it has the
> following message and the binary code has a segmentation fault when it is
> executed.
>
> /tmp/ccJPjMe4.s: Assembler messages:
> /tmp/ccJPjMe4.s:4250: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4589: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4694: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4899: rdhi, rdlo and rm must all be different
> /tmp/ccJPjMe4.s:4915: rdhi, rdlo and rm must all be different
>
> Any idea?
>
> Regards,
> Won
>
> _______________________________________________
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> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>