[LLVMdev] cross-section differences in MC generation

[Justin Hibbits]

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- Justin

On Thu, Jun 26, 2014 at 1:26 PM, Rafael Avila de Espindola
<rafael.espindola at gmail.com> wrote:
>
>
> Sent from my iPhone
>
>> On Jun 26, 2014, at 12:33, Justin Hibbits <jrh29 at alumni.cwru.edu> wrote:
>>
>> I'm working on Position-independent code for 32-bit PowerPC, but
>> running into a problem.  At the beginning of each function, there's a
>> pre-word that's the difference between the PICBase (.L1$pb) and the
>> GOT.  This works fine when generating assembly output, but it fails
>> when generating ELF output, with the error "Cannot represent a
>> difference across sections" (line 847, lib/MC/ELFObjectWriter.cpp).
>>
>> Roman Divacky suggested I try something with 'let EncoderMethod = ...'
>> similar to how the TOC entries are done for ppc64.  However, I'm not
>> sure if that would work, given that the TOC on ppc64 is handled
>> differently from the GOT on ppc32, and I'm not sure how to represent
>> that if it could work.
>>
>> Any ideas on how a cross-section diff and relocation could be
>> represented for this?
>>
>
>
> Can you post the generated assembly that works with gas but fails with llvm-mc?
>
>> Thanks,
>> Justin
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