[fpc-pascal] ARM Linux crosscompiler: compiles but... executable gives segmentation fault

[Michael Ring]

It looked more like the stack got messed up, for me it crashed after the 
second (if I remember correctly) procedure was called. I can dig into 
this on Sunday evening, after returning to my home.

Michael

Am 10.01.14 14:29, schrieb Pierre Free Pascal:
>
>> -----Message d'origine-----
>> De : fpc-pascal-bounces at lists.freepascal.org [mailto:fpc-pascal-
>> bounces at lists.freepascal.org] De la part de Michael Ring
>> Envoyé : vendredi 10 janvier 2014 13:40
>> À : FPC-Pascal users discussions
>> Objet : Re: [fpc-pascal] ARM Linux crosscompiler: compiles but...
>> executable gives segmentation fault
>>
>> I think this is an ARMV6 specific Problem, I also realized while
>> debugging on embedded target that it does not work anymore, same code
>> compiled for ARMV7 debugs (and runs) just fine...
>>
>> Until now I did not find the time to search for the revision that broke
>> armv6m.
>>
>> Michael
>>
>> Am 10.01.14 13:27, schrieb Reinier Olislagers:
>>> Hi all,
>>>
>>> For the Dutch among us: de dag die je wist dat zou komen...
>>>
>>> Thanks to earlier help I got to build an ARM Linux cross compiler
>> module
>>> in fpcup which even compiles fpcup itself (both using trunk and
>> stable
>>> starting compiler):
>>> opt="-fPIC -dFPC_ARMHF"
>>> crossopt="-CpARMV6 -CaEABIHF -CfVFPV2"
>>>
>>> fpc -g -gl -Tlinux -Parm simple.lpr
>>>
>>> Question: should I have compiled with -fPIC?
>>>
>>> Uploaded resulting executable
>>> http://ubuntuone.com/0y3yXGcU8fEXR6OTMyvfGN
>>>
>>> The program:
>>> program simple;
>>>
>>> begin
>>>     writeln('hello');
>>> end.
>>>
>>> Relevant fpc.cfg snippet:
>>> #IFDEF CPUARM
>>> #IFDEF LINUX
>>> -CpARMV6
>>> -CaEABIHF
>>> -CfVFPV2
>>> -FDC:\development\cross\bin\arm-linux\
>>> -XParm-linux-
>>> -Xd
>>> -FlC:\development\cross\lib\arm-linux\
>>> -Xr/usr/lib
>>> #ENDIF
>>> #ENDIF
>>>
>>> However, running the resulting binary on my virtual Raspbian fails
>> with
>>> a segmentation fault. Running under gdb gives
>>> (gdb) run
>>> Starting program: /root/simple
>>>
>>> Program received signal SIGSEGV, Segmentation fault.
>>> 0x0002b6e4 in
>>> SYSTEM_$$_ARRAYSTRINGTOPPCHAR$array_of_ANSISTRING$LONGINT$$PPCHAR ()
>    Maybe it is just using an unsupported instruction?
>
> what does "x /10i $pc" return?
>
> Pierre Muller
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