From: "H.J. Lu" <hjl.tools@gmail.com>
To: Joseph Myers <joseph@codesourcery.com>
Cc: GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH 3/7] Add GLIBC_ABI_DT_RELR for DT_RELR support
Date: Sat, 5 Feb 2022 09:24:31 -0800 [thread overview]
Message-ID: <CAMe9rOqbxrfD8fXDBR=U682xLpQoSe_nLYePa2tQCdXnCo4FaQ@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.22.394.2202042355450.244210@digraph.polyomino.org.uk>
On Fri, Feb 4, 2022 at 3:58 PM Joseph Myers <joseph@codesourcery.com> wrote:
>
> On Fri, 4 Feb 2022, H.J. Lu via Libc-alpha wrote:
>
> > On Fri, Feb 4, 2022 at 1:01 PM Joseph Myers <joseph@codesourcery.com> wrote:
> > >
> > > On Fri, 4 Feb 2022, H.J. Lu via Libc-alpha wrote:
> > >
> > > > Good point. How about "enable DT_RELR only if SUPPORT_DT_RELR is
> > > > defined? Currently, only x86 defines SUPPORT_DT_RELR.
> > >
> > > My preference would be:
> > >
> > > 1. Support user executables and shared libraries with RELR relocations
> > > across all platforms, unconditionally.
> >
> > RELR is kind of like static PIE. Not all architectures support it.
>
> My understanding is that analogy only applies to the static linker, not to
> glibc itself - that the static linker needs architecture-specific code,
> but glibc doesn't (as evidenced by the lack of any architecture-specific
> non-configure changes in this patch series).
>
> > RELR should be enabled only if there is a linker which supports
> > -z pack-relative-relocs.
>
> (a) That should only apply to "enabled" in the sense of "glibc itself uses
> RELR relocations", not "glibc supports loading executables and shared
> libraries with such relocations".
>
> (b) The configure test for that should be architecture-independent, with
> no architecture-specific configure changes needed at all.
>
Fixed in the v2 patch.
--
H.J.
next prev parent reply other threads:[~2022-02-05 17:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-03 18:09 [PATCH 0/7] Support DT_RELR relative relocation format H.J. Lu
2022-02-03 18:09 ` [PATCH 1/7] elf: Support DT_RELR relative relocation format [BZ #27924] H.J. Lu
2022-02-03 18:09 ` [PATCH 2/7] elf: Properly handle zero DT_RELA/DT_REL values H.J. Lu
2022-02-03 18:09 ` [PATCH 3/7] Add GLIBC_ABI_DT_RELR for DT_RELR support H.J. Lu
2022-02-04 19:53 ` Joseph Myers
2022-02-04 20:04 ` H.J. Lu
2022-02-04 20:10 ` Joseph Myers
2022-02-04 20:40 ` H.J. Lu
2022-02-04 21:01 ` Joseph Myers
2022-02-04 21:08 ` H.J. Lu
2022-02-04 23:58 ` Joseph Myers
2022-02-05 17:24 ` H.J. Lu [this message]
2022-02-03 18:09 ` [PATCH 4/7] x86/configure.ac: Define PI_STATIC_AND_HIDDEN/SUPPORT_STATIC_PIE H.J. Lu
2022-02-03 18:09 ` [PATCH 5/7] x86: Define SUPPORT_DT_RELR H.J. Lu
2022-02-03 18:09 ` [PATCH 6/7] Add --disable-default-dt-relr H.J. Lu
2022-02-03 18:09 ` [PATCH 7/7] NEWS: Mention DT_RELR support H.J. Lu
2022-02-04 20:00 ` [PATCH 0/7] Support DT_RELR relative relocation format Joseph Myers
2022-02-04 20:08 ` H.J. Lu
2022-02-04 20:12 ` Joseph Myers
2022-02-04 20:32 ` Fangrui Song
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