[linker] relaxation question

M R Swami Reddy MR.Swami.Reddy@nsc.com
Thu Jul 30 09:56:00 GMT 2009


Hi Nick,
Thank you very much for your suggestion.
I will try to implement the fix for this issue in Assembler sources.

Thanks
Swami

Nick Clifton wrote:
> Hi Swami,
>
>   
>> For a simple c++ test case, .gcc_except_table section created. But this 
>> section has references (ie label refs) from main (ie code section).
>>
>> During the linker relax, CODE section will be relaxed, due to this 
>> references in the .gcc_except_table affected with wrong address after relax.
>>
>> Is this known issue in linker?
>>     
>
> Not an issue as such, but it may be a known problem when implementing 
> linker relaxation.
>
> What should happen is that in the assembler the references from the 
> .gcc_except_table section to symbols in the .text section are converted 
> into relocations against those symbols.  Then in the linker when 
> relaxation is performed, (which must be before the relocations are 
> resolved), any symbols which point into the .text section must be 
> adjusted as the section is relaxed.  That way when the relocations are 
> eventually resolved in the .gcc_except_table section they will get the 
> correct values.
>
> Cheers
>    Nick
>
>
>
>
>   




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