From: Juchan Kim <juckim@blackberry.com>
To: "fweimer@redhat.com" <fweimer@redhat.com>
Cc: "libc-alpha@sourceware.org" <libc-alpha@sourceware.org>
Subject: Re: [Question] ifunc odering in ELF
Date: Tue, 17 Sep 2019 13:19:00 -0000 [thread overview]
Message-ID: <1568726364.28076.91.camel@blackberry.com> (raw)
In-Reply-To: <87pnjzy75u.fsf@oldenburg2.str.redhat.com>
Hi Florian,
OK. That's what I also expected.
Thanks for the reply.
Cheers,
Juchan
On Mon, 2019-09-16 at 22:43 -0400, Florian Weimer wrote:
> * Juchan Kim:
>
> >
> > We have two ifuncs foo1 and foo2 in our library
> >
> > foo1 has foo1_resolver()
> > foo2 has foo2_resolver()
> >
> >
> > foo1_resolver() {
> > ...
> > }
> >
> > foo2_resolver() {
> > foo1()
> > ...
> > }
> IFUNC resolvers must not depend on run-time relocations. If you
> follow
> that rule, this cannot happen.
>
> binutils ld sorts IFUNC relocations last, which helps, but to cover
> more
> cases (but not all of them), run-time reordering of relocations is
> needed. We have some patches for that, but my impression is that the
> glibc project does not want them. Instead, we're probably going to
> remove all IFUNC resolvers with relocation dependencies from glibc,
> and
> tell others to do so as well.
>
> Thanks,
> Florian
next prev parent reply other threads:[~2019-09-17 13:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 19:03 Juchan Kim
2019-09-12 19:18 ` Andrew Pinski
2019-09-17 2:43 ` Florian Weimer
2019-09-17 13:19 ` Juchan Kim [this message]
2019-09-17 13:25 ` Adhemerval Zanella
2019-09-20 15:51 ` Florian Weimer
2019-09-20 16:00 ` Szabolcs Nagy
2019-10-16 12:55 ` Florian Weimer
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