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Re: [RFC] ppc64 and calling conventions
- From: Benjamin Herrenschmidt <benh at kernel dot crashing dot org>
- To: Ulrich Drepper <drepper at redhat dot com>
- Cc: libc-alpha at sources dot redhat dot com, linuxppc64-dev <linuxppc64-dev at ozlabs dot org>
- Date: Thu, 11 Nov 2004 16:56:26 +1100
- Subject: Re: [RFC] ppc64 and calling conventions
- References: <1100143968.24782.15.camel@gaston> <4192F473.3040800@redhat.com>
On Wed, 2004-11-10 at 21:11 -0800, Ulrich Drepper wrote:
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> Benjamin Herrenschmidt wrote:
>
> > The current one still exports 'normal' function symbols, that is
> > procedure descriptors and "dot" symbols for the actual function.
>
> What dot symbols? They are dead. We don't have them anymore.
They are handy to get to the actual function with a debugger, we were
pretty unhappy in kernel-land to see them gone... but I can remove them.
> > Something that was proposed a while ago (by Ulrich I think) is that
> > instead, I could export simple non-descriptor symbols that point
> > directly to the code and link the whole thing at 0.
>
> Well, something like this. The vDSO must be freely relocatable without
> changes unless you forever want to have one address. ld.so won't
> perform any relocations. So, letting libc figure out the descriptors is
> possible, just provide symbol offsets.
Yah, I prefer that solution too.
Ben.