From: Alan Modra <amodra@gmail.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Kaylee Blake <klkblake@gmail.com>, Binutils <binutils@sourceware.org>
Subject: Re: RFC: [PATCH] ELF: Don't require section header on ELF objects
Date: Mon, 9 Mar 2020 22:26:22 +1030 [thread overview]
Message-ID: <20200309115622.GL5384@bubble.grove.modra.org> (raw)
In-Reply-To: <CAMe9rOpp5mZdQh+uK5s4fReyxXpazQK0CJLbYPRgAbWzuQw7vw@mail.gmail.com>
On Sun, Mar 08, 2020 at 07:35:56PM -0700, H.J. Lu wrote:
> On Sun, Mar 8, 2020 at 7:23 PM Alan Modra <amodra@gmail.com> wrote:
> > It doesn't. The snippet of .dynsym I posted was from a binary with
> > DT_GNU_HASH. elflink.c:_bfd_elf_link_renumber_dynsyms should convince
> > you that any ordering seen is by chance.
I forgot that elf_gnu_hash_process_symidx does in fact perform yet
another ordering of .dynsyms, so undefined non-locals are put before
defined non-locals.
> Entries in DT_GNU_HASH were originally defined. A backend
> may change some entries to undefined.
Yeah, the function pointer hack to make pointer comparisons work
between an application and shared libray. SHN_UNDEF but with a
non-zero value like defined symbols, so not really undefined.
--
Alan Modra
Australia Development Lab, IBM
next prev parent reply other threads:[~2020-03-09 11:56 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-08 17:59 H.J. Lu
2020-03-08 18:06 ` H.J. Lu
2020-03-08 23:35 ` Alan Modra
2020-03-08 23:46 ` H.J. Lu
2020-03-09 0:02 ` H.J. Lu
2020-03-09 0:02 ` Kaylee Blake
2020-03-09 0:05 ` Alan Modra
2020-03-09 1:36 ` H.J. Lu
2020-03-09 1:59 ` Kaylee Blake
2020-03-09 2:23 ` Alan Modra
2020-03-09 2:35 ` H.J. Lu
2020-03-09 4:14 ` H.J. Lu
2020-03-09 4:59 ` Kaylee Blake
2020-03-09 11:56 ` Alan Modra [this message]
2020-03-08 23:24 ` Kaylee Blake
2020-03-08 23:29 ` H.J. Lu
2020-03-08 23:38 ` Alan Modra
2020-03-08 23:45 ` H.J. Lu
2020-03-12 2:14 ` Fangrui Song
2020-03-09 8:13 ` Florian Weimer
2020-03-09 12:54 ` Kaylee Blake
2020-03-09 13:06 ` Florian Weimer
2020-03-09 13:14 ` Kaylee Blake
2020-03-09 13:16 ` Florian Weimer
2020-03-09 13:28 ` Kaylee Blake
2020-03-09 13:29 ` Florian Weimer
2020-03-09 13:45 ` Kaylee Blake
2020-03-09 13:54 ` H.J. Lu
2020-03-09 14:02 ` Kaylee Blake
2020-03-09 14:52 ` Florian Weimer
2020-03-09 15:07 ` Kaylee Blake
2020-03-09 15:29 ` Florian Weimer
2020-03-09 13:44 ` Alan Modra
2020-03-09 13:54 ` Kaylee Blake
2020-03-09 22:34 ` Alan Modra
2020-03-10 0:14 ` H.J. Lu
2020-03-09 14:34 ` Michael Matz
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