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[MIPS] Can we have R_MIPS_PC64?

Andrew Pinski pinskia@gmail.com
Wed Feb 5 09:04:00 GMT 2020 
On Wed, Feb 5, 2020 at 12:59 AM Andrew Pinski <pinskia@gmail.com> wrote:
>
> On Tue, Feb 4, 2020 at 11:20 PM Fangrui Song <i@maskray.me> wrote:
> >
> > R_MIPS_PC32 exists as a GNU extension.
> > R_MIPS_PC64 existed, but was removed by https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=4030e8f62467c29b782aa2480e1e452b8e458699
> > (like all the old commits, the description just recorded what the commit *did*. There was no *why*.)
>
> But the why is recorded still in the mail archives:
> https://sourceware.org/ml/binutils/2004-04/msg00657.html

See the GCC side of the reason:
https://gcc.gnu.org/ml/gcc-patches/2004-04/msg01093.html


Thanks,
Andrew Pinski

>
> Thanks,
> Andrew Pinski
>
>
> >
> > This just makes certain things unnecessarily complex.
> >
> > * DW_EH_PE_pcrel|DW_EH_PE_sdata8 => ?
> > * __patchable_function_entries has to have the SHF_WRITE flag on MIPS https://gcc.gnu.org/ml/gcc/2020-01/msg00106.html
> >    .quad foo - . => Error: PC-relative reference to a different section
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