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Re: x86-64 large data sections updated
> On Wed, Jun 15, 2005 at 03:34:58PM -0400, Ian Lance Taylor wrote:
> > Richard Henderson <rth@redhat.com> writes:
> >
> > > > OK, so dropping here the lcommon test sounds sane?
> > >
> > > The entire function is not sane. The .largecomm assembler directive
> > > should set the section to SHN_X86_64_LARGE_COMMON, and that should be
> > > the end of it. Once COMMON symbols get mapped into .lcommon/.lbss
> > > sections, they don't return.
> >
> > There is no interface for gas to set the ELF section of a symbol,
> > except to set the symbol of the BFD symbol to some BFD section. So
> > unless we introduce such an interface, the only way to do this is to
> > use a magic BFD section, which then gets translated into the
> > appropriate ELF section code. That is how the MIPS backend handles
> > SHN_MIPS_SCOMMON--gas puts the symbol in ".scommon" and
> > _bfd_mips_elf_section_from_bfd_section translates ".scommon" into
> > SHN_MIPS_SCOMMON. That seems to be what Jan is emulating in his code.
>
> Do you have a MIPS assembly example to put a symbol in
> SHN_MIPS_SCOMMON?
I didn't try it but it should be via ordinary .comm keyword and -G
set higher than it's size. There is generic code in gas that arrange
things into scommon in such case and mips backend then trick in the
SHN_MIPS_SCOMMON.
Honza
>
>
> H.J.