Dynamic Libraries
Till Straumann
strauman at slac.stanford.edu
Thu Sep 14 21:52:48 UTC 2006
Marek.
Regardless of a possible fix to your linker script -- here is a workaround:
Symbols for the sections are not really needed and you can simply delete
them from the generated 'symbolfile.c' and not use the linker script at all
(or just delete the offending ones).
To make life easier, I added a new [-s] option to xsyms which you have
to enable in order to produce entries for the section symbols in the table.
I.e., if you don't use -s you should be OK.
HTH
-- Till
Marek Prochazka wrote:
>> I simply didn't get a chance to look at it [don't have any
>> sparc tools
>> installed].
>> What BSP are you using - I could give it a try.
>>
>
> I use this:
>
> BSP NAME: sis
> BOARD: any based on the European Space Agency's ERC32
> BUS: N/A
> CPU FAMILY: sparc
> CPU: ERC32 (SPARC V7 + on-CPU peripherals) based on
> Cypress 601/602
> COPROCESSORS: on-chip 602 compatible FPU
> MODE: 32 bit mode
>
> My target platform is Leon2.
>
>
>> Also: please send me a full console log of the failing build command.
>>
>
> /opt/rtems-4.6/bin/sparc-rtems-gcc -g -DCDS_DEBUG_VERSION -Wall -W
> -ansi -pedantic -DG_RTEMS_VERSION -DG_LEON_VERSION
> -DG_SPACEWIRE_VERSION -D_POSIX_C_SOURCE=199506L -msoft-float -qleon2
> -I./inc -I/home/marek/work/DRIVERS/UDP/inc
> -I/home/marek/work/DRIVERS/LEON_SPW/inc
> -I/home/marek/work/SOIS/Tools/MA_Emulation/inc
> -I/home/marek/work/SOIS/Tools/DAS_Device_Emulation/inc
> -D_MICROORB_RTCORBA_THREADPOOL_WITH_LANES -I./idl -I../cexp-1.5 Loader.o
> -L../cexp-1.5/build-rtems -L../cexp-1.5/build-rtems/regexp
> -L../cexp-1.5/build-rtems/binutils/bfd
> -L../cexp-1.5/build-rtems/binutils/libiberty
> -L../cexp-1.5/build-rtems/binutils/opcodes -lcexp -lspencer_regexp -lbfd
> -liberty -lopcodes -L/home/marek/work/lib -L/home/marek/work/BSW/lib
> -L/home/marek/work/SOIS/CMS/lib -L/home/marek/work/SOIS/CMS_Config/lib
> -L/home/marek/work/SOIS/MMS/lib -L/home/marek/work/DisCo/SOM/IFAS/lib
> -L/home/marek/work/DisCo/SOM/FDIR/lib
> -L/home/marek/work/DRIVERS/LEON_SPW/lib -lMMS_RTEMS_LEON_debug
> -lCMS_RTEMS_LEON_debug -lspwCtm -lBSW_RTEMS_debug -o Loader
> --------- Generating SYSTEM symbol table
> ../cexp-1.5/build-host/xsyms -C Loader Symbols.c > link_helper
> --------- Compiling SYSTEM symbol table
> /opt/rtems-4.6/bin/sparc-rtems-gcc -c -fomit-frame-pointer -fasm -O
> -I../cexp-1.5 Symbols.c
> --------- Linking Loader application - second pass
> /opt/rtems-4.6/bin/sparc-rtems-gcc -g -DCDS_DEBUG_VERSION -Wall -W
> -ansi -pedantic -DG_RTEMS_VERSION -DG_LEON_VERSION
> -DG_SPACEWIRE_VERSION -D_POSIX_C_SOURCE=199506L -msoft-float -qleon2
> -I./inc -D_MICROORB_RTCORBA_THREADPOOL_WITH_LANES -I./idl -I../cexp-1.5
> Symbols.o Loader.o link_helper -L../cexp-1.5/build-rtems
> -L../cexp-1.5/build-rtems/regexp -L../cexp-1.5/build-rtems/binutils/bfd
> -L../cexp-1.5/build-rtems/binutils/libiberty
> -L../cexp-1.5/build-rtems/binutils/opcodes -lcexp -lspencer_regexp -lbfd
> -liberty -lopcodes -L/home/marek/work/lib -L/home/marek/work/BSW/lib
> -L/home/marek/work/DisCo/SOM/IFAS/lib
> -L/home/marek/work/DisCo/SOM/FDIR/lib
> -L/home/marek/work/DRIVERS/LEON_SPW/lib -lMMS_RTEMS_LEON_debug
> -lCMS_RTEMS_LEON_debug -lspwCtm -lBSW_RTEMS_debug -o Loader
> /opt/rtems-4.6/lib/gcc-lib/sparc-rtems/3.2.3/../../../../sparc-rtems/bin
> /ld: ADDR forward reference of section .text
> collect2: ld returned 1 exit status
> make: *** [t] Error 1
>
> link_helper:
> __cexp__dummy_alias_0 = ADDR( .text ) ;
> __cexp__dummy_alias_1 = ADDR( .data ) ;
> __cexp__dummy_alias_2 = ADDR( .bss ) ;
> __cexp__dummy_alias_3 = ADDR( .jcr ) ;
>
> Many thanks,
> Marek
>
>
>> -- Till
>>
>> Marek Prochazka wrote:
>>
>>> Please, anyone having a hint how to deal with the problem described
>>> below? Or should I consider the issue being hard to solve
>>>
>> in an easy way
>>
>>> and hence Cexp not being able to use on sparc-rtems? Sorry
>>>
>> but I have to
>>
>>> keep pushing as I have to decide reasonably quickly whether
>>>
>> I can use
>>
>>> Cexp for my project or not.
>>>
>>> Thanks.
>>>
>>> Best regards,
>>> Marek Prochazka
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: Marek Prochazka [mailto:Marek.Prochazka at scisys.co.uk]
>>>> Sent: 12 September 2006 17:18
>>>> To: Till Straumann
>>>> Cc: rtems-users at rtems.com
>>>> Subject: RE: Dynamic Libraries
>>>>
>>>> Hi,
>>>>
>>>> I have successfully linked a Cexp "loader" application on
>>>> Linux and was
>>>> able to load modules at runtime. Quite good stuff!
>>>>
>>>> When I am trying to do the same for sparc-rtems target, I get the
>>>> following message when linking:
>>>>
>>>> /opt/rtems-4.6/lib/gcc-lib/sparc-rtems/3.2.3/../../../../sparc
>>>> -rtems/bin
>>>> /ld: ADDR forward reference of section .text
>>>>
>>>> My link_helper file looks like this:
>>>>
>>>> __cexp__dummy_alias_0 = ADDR( .text ) ;
>>>> __cexp__dummy_alias_1 = ADDR( .data ) ;
>>>> __cexp__dummy_alias_2 = ADDR( .bss ) ;
>>>> __cexp__dummy_alias_3 = ADDR( .jcr ) ;
>>>>
>>>> Corresponding part of mysymbtab.c is
>>>>
>>>> static CexpSymRec systemSymbols[] = {
>>>> {
>>>> .name =".text",
>>>> .value.ptv =(void*)&__cexp__dummy_alias_0,
>>>> .value.type =TVoid,
>>>> .size =0,
>>>> .flags =0|CEXP_SYMFLG_SECT,
>>>> },
>>>> {
>>>> .name =".data",
>>>> .value.ptv =(void*)&__cexp__dummy_alias_1,
>>>> .value.type =TVoid,
>>>> .size =0,
>>>> .flags =0|CEXP_SYMFLG_SECT,
>>>> },
>>>> {
>>>> .name =".bss",
>>>> .value.ptv =(void*)&__cexp__dummy_alias_2,
>>>> .value.type =TVoid,
>>>> .size =0,
>>>> .flags =0|CEXP_SYMFLG_SECT,
>>>> },
>>>> {
>>>> .name =".jcr",
>>>> .value.ptv =(void*)&__cexp__dummy_alias_3,
>>>> .value.type =TVoid,
>>>> .size =0,
>>>> .flags =0|CEXP_SYMFLG_SECT,
>>>> },
>>>> ...
>>>>
>>>> I have built libcexp for sparc-rtems and xsyms on Linux for
>>>> sparc-rtems
>>>> target. When I tried to build xsyms on top of libelf (--disable-bfd
>>>> --disable-cexp) then the mysymtab.c file generated by xsyms
>>>> is actually
>>>> a binary file - so I do not know how use it.
>>>>
>>>> Any hints related to this?
>>>>
>>>> Many thanks,
>>>> Marek
>>>>
>>>>
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Marek Prochazka [mailto:Marek.Prochazka at scisys.co.uk]
>>>>> Sent: 12 September 2006 09:28
>>>>> To: Till Straumann
>>>>> Cc: rtems-users at rtems.com
>>>>> Subject: RE: Dynamic Libraries
>>>>>
>>>>> Hi,
>>>>>
>>>>> thanks, this helped me to link it! BTW my version of the
>>>>>
>>>>>
>>>> README file,
>>>>
>>>>
>>>>> which comes from Cexp 1.5 sources downloaded from the Cexp
>>>>>
>>>>>
>>>> home page,
>>>>
>>>>
>>>>> does not mention the trick with "> link_helper" in points
>>>>>
>> 2) and 4).
>>
>>>>> Regards,
>>>>> Marek
>>>>>
>>>>>
>>>>>
>>>>>> Allan is correct. RTMF (see step 4), please [from the README]:
>>>>>>
>>>>>> > 1) compile and link all sources, libraries etc.; build an
>>>>>> executable
>>>>>> > 2) xsyms -C executable mysymtab.c > link_helper
>>>>>> > 3) compile mysymtab.c (set -I to Cexp source directory, since
>>>>>> > cexpsyms.h is included)
>>>>>> > 4) link application again, but this time add
>>>>>>
>>>>>>
>>>> 'mysymtab.c' to the
>>>>
>>>>
>>>>>> > list of sources and 'link_helper' to the list of files to
>>>>>> > be linked.
>>>>>> > NOTE: Step 1) linking succeeds without a symtab.o
>>>>>>
>>>>>>
>>>>> because there's
>>>>>
>>>>>
>>>>>> > a weak NULL-ptr alias for the builtin symtab.
>>>>>>
>>>>>> HTH
>>>>>> -- Till
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>
>>>
>>
>
>
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