Re: CVS commit: src/share/mk

[Matt Thomas <matt%3am-software.com@localhost>]

At 01:50 PM 2/25/2003, Bill Studenmund wrote:
> On Wed, 19 Feb 2003, Matt Thomas wrote:
>
> >
> > Module Name:  src
> > Committed By: matt
> > Date:         Wed Feb 19 19:03:41 UTC 2003
> >
> > Modified Files:
> >       src/share/mk: bsd.kmod.mk
> >
> > Log Message:
> > When making a LKM for powerpc, add function trampolines to undefined
> > functions.  This makes LKMs functional for powerpc.
>
> Cool!
>
> But what we really need is for the linker to be able to do this
> automatically. While this change will help with lkms, (unless I
> misunderstand it) it won't help with large programs, which will face the
> same problem.

I agree.  But I'm not going to do it.  elf32-ppc.c scares me. :)

> While it's unlikely we'll have programs that big, they do exist. :-)
>
> Also, for cross-lkm calls, we'll end up using the trampolines, won't we?
> While they are uncommon now, if we went with an aggressive lkm'd kernel,
> it might be a performance impact.

It's no slower than going through a PLT. :)


--
Matt Thomas               Internet:   matt%3am-software.com@localhost
3am Software Foundry      WWW URL:    http://www.3am-software.com/bio/matt/
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