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Problem in generating position independent code with out TEXTREL

Darisi V SATISH BABU
Note: This was originally posted on 12th August 2010 at http://forums.arm.com

Hi Experts,

Issue:Not able to remove TEXTREL from our static library generated with --apcs /fpic option using armcc(RVCT 4.0 build 771  tool chain)

Description:
    We compiled our codebase(some modules with handwritten assembly) using armcc(RVCT 4.0 build 771  tool chain) to get static libraries, and then these are used by gstreamer module which further compiles using the above generated libraries with wrappers using GCC tool chain and creates shared objects(.so).

Even though we use equivalent --apcs /fpic compile time option during static library creation to remove position independent code, the TEXTREL are not going from library.
When we disable the (handwritten assembly) in the above mentioned codebase, TEXTRELs go away.
As there are lot of handwritten ARM assembly functions,its difficult to enable one by one and compile and check. :unsure:

So,Experts please throw some light on this issue.


Thanks In Advance,
satish
Parents
  • Arm Employee Badge
    Note: This was originally posted on 16th August 2010 at http://forums.arm.com

    Thank you for the reply.I had removed all the IMPORTS from my assembly but still TEXTREL is coming in library.
    I am building handwritten assembly with armcc only(not sure whether it uses armasm internally).
    My assembly functions are in .c files in following fashion:

    CODE:
    __asm void func1()
    {

    }

    So can you tell me what else may be reason, for generation of TEXTREL in library.


    You're using what's known as "embedded assembly".  What you write inside the embedded asm functions has pretty much the same rules as a .s file, but armcc will generate some EXPORT/PROC/ENDP directives for you and some IMPORT directives if you're using __cpp(...).

    It's not using the IMPORT directive per se that is generating the relocation; it's what you do with the imported symbol (DCD or LDR rx,= in my example above).  If know the symbols being used by the unwanted relocations and can post the embedded asm lines that mention them; we might be able to suggest what you could do instead.
Reply
  • Arm Employee Badge
    Note: This was originally posted on 16th August 2010 at http://forums.arm.com

    Thank you for the reply.I had removed all the IMPORTS from my assembly but still TEXTREL is coming in library.
    I am building handwritten assembly with armcc only(not sure whether it uses armasm internally).
    My assembly functions are in .c files in following fashion:

    CODE:
    __asm void func1()
    {

    }

    So can you tell me what else may be reason, for generation of TEXTREL in library.


    You're using what's known as "embedded assembly".  What you write inside the embedded asm functions has pretty much the same rules as a .s file, but armcc will generate some EXPORT/PROC/ENDP directives for you and some IMPORT directives if you're using __cpp(...).

    It's not using the IMPORT directive per se that is generating the relocation; it's what you do with the imported symbol (DCD or LDR rx,= in my example above).  If know the symbols being used by the unwanted relocations and can post the embedded asm lines that mention them; we might be able to suggest what you could do instead.
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