Re: Grub for ia64 - function descriptors

[Hollis Blanchard <hollis@penguinppc.org>]

On Fri, 2006-09-29 at 08:59 +0200, tgingold@free.fr wrote:
> Quoting Hollis Blanchard <hollis@penguinppc.org>:
> 
> > On Thu, 2006-09-28 at 15:45 +0200, tgingold@free.fr wrote:
> > >
> > >           if (grub_strcmp (name, "grub_mod_init") == 0)
> > >             mod->init = (void (*) (grub_dl_t)) sym->st_value;
> > >
> > > This won't work on ia64 AFAIK.
> >
> > Can't this problem be solved with an architecture-specific macro?
> >
> > FWIW, 64-bit PowerPC also uses function descriptors. They look something
> > like:
> >         long code_address
> >         long table_of_contents
> >         long unused
> >
> > The table_of_contents (TOC) value needs to be placed into r2 when
> > jumping at code_address (and of course the old one needs to be restored
> > when returning).
> Indeed, same issue.
> 
> >I assume IA64 is similar here, and given that, a
> > module_jump function implemented in assembly by each architecture would
> > solve this problem.
> I'd prefer modules to export pointers. Seems to be easier to deal.

I don't know what you mean; please elaborate (with pseudo-code if
possible).

-Hollis