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Re: Grub for ia64 - function descriptors

From: tgingold
Subject: Re: Grub for ia64 - function descriptors
Date: Fri, 29 Sep 2006 08:59:02 +0200
User-agent: Internet Messaging Program (IMP) 3.2.5

Quoting Hollis Blanchard <address@hidden>:

> On Thu, 2006-09-28 at 15:45 +0200, address@hidden 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.


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