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Re: Segment registers support for i386
On 4/4/06, Andrew Haley <aph@redhat.com> wrote:
> RÃmy Saissy writes:
>
> > > It would take a massive target-specific backend hack to make that
> > > happen, as GCC > currently only supports flat address spaces. ;-)
> >
> > I don't understand why.
> > gcc currently consider every data access on i386 to be %ds:offset or %ss:offset
> > depending on the instruction.
>
> No, that's not true. gcc doesn't know about %ds or %ss.
oh sorry. that's what I though but It seems I explained it with a bad english ;)
>
> > The purpose is only to add a way to explicitly indicate the section
> > to use then is could be %gs:offset or %fs:offset.
> >
> > I'm new in gcc hacking therefore I still have to learn more about the
> > internals but
> > at first glance it doesn't sounds like a so big work.
>
> You'd have to teach gcc about different address spaces. For example,
> gcc would have to know that %gs:foo couldn't be accessed via %ds.
>
Ok. thanks you too for your anwers, I'll try to do something good now ;)
Have a great day.
--
RÃmy Saissy JabberID: remy.saissy@jabber.fr
Web: http://remysaissy.free.fr
"L'homme qui a le plus vÃcu n'est pas celui qui a comptà le plus d'annÃes,
mais celui qui a le plus senti la vie."
J.-J. Rousseau, Emile.