[LLVMdev] ARM cross compiling causes segmentation fault

[Dale Johannesen]

On Jul 8, 2009, at 1:15 PMPDT, Won J Jeon wrote:

> Thanks. I could take a look at the lines and all of them have smull  
> instruction like 'smull r0, r1, r0, r1'.

OK, unless you're targeting a very old version of ARM, the warning is  
an assembler bug as described by S. Bharadwaj Yadavalli  I have seen  
the same problem in a different version of gas, as well, and it is  
harmless as he says.  You will have to look elsewhere for the reason  
your program doesn't work.

> Won
>
> On Wed, Jul 8, 2009 at 2:54 PM, Dale Johannesen <dalej at apple.com>  
> wrote:
>
> On Jul 8, 2009, at 12:52 PMPDT, Won J Jeon wrote:
>
>> 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?
>
> Use -S to keep the assembly file around.
>
> You don't seem to be very familiar with compilers, please try to  
> figure things like this out from the documentation first.
>
>
>> 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.
>>
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