From: Daniel Jacobowitz <drow@false.org>
To: binutils@sourceware.org, binutils@sources.redhat.com
Cc: "H. J. Lu" <hjl@lucon.org>, Vivek Goyal <vgoyal@redhat.com>
Subject: Re: Linker Bug or Design Intent (Absolute symbols in zero sized sections)
Date: Wed, 27 Sep 2006 01:51:00 -0000 [thread overview]
Message-ID: <20060926235350.GA4214@nevyn.them.org> (raw)
In-Reply-To: <20060926232714.GA1534@bubble.grove.modra.org>
On Wed, Sep 27, 2006 at 08:57:14AM +0930, Alan Modra wrote:
> On Tue, Sep 26, 2006 at 12:45:20PM -0400, Daniel Jacobowitz wrote:
> > On Tue, Sep 26, 2006 at 09:30:24AM -0700, H. J. Lu wrote:
> > > Convert section relative symbol to absolute shouldn't be a problem
> > > in most cases. If we know it may be a problem at link time, we can
> > > keep it section relative.
> >
> > You keep saying this, but on various platforms it isn't true. Section
> > relative symbols move with an object if it is relocated in any way.
> > Absolute symbols don't.
>
> This isn't true for the common ELF targets. An absolute symbol in a
> shared library is effectively relative to the base of the shared lib.
> A sad consequence of defining syms like _GLOBAL_OFFSET_TABLE_ and
> _DYNAMIC as absolute.
Which I tried to change, you may recall :-) For those platforms which
do care, absolute _G_O_T_ is a serious problem, and there's a knob for
it.
--
Daniel Jacobowitz
CodeSourcery
WARNING: multiple messages have this Message-ID
From: Daniel Jacobowitz <drow@false.org>
To: binutils@sourceware.org, binutils@sources.redhat.com
Cc: "H. J. Lu" <hjl@lucon.org>, Vivek Goyal <vgoyal@redhat.com>
Subject: Re: Linker Bug or Design Intent (Absolute symbols in zero sized sections)
Date: Wed, 27 Sep 2006 03:09:00 -0000 [thread overview]
Message-ID: <20060926235350.GA4214@nevyn.them.org> (raw)
Message-ID: <20060927030900.x1u1s-UKAEuvmPLx_gpvrI2rj9Q7owhyCWefqNEiHlw@z> (raw)
In-Reply-To: <20060926232714.GA1534@bubble.grove.modra.org>
On Wed, Sep 27, 2006 at 08:57:14AM +0930, Alan Modra wrote:
> On Tue, Sep 26, 2006 at 12:45:20PM -0400, Daniel Jacobowitz wrote:
> > On Tue, Sep 26, 2006 at 09:30:24AM -0700, H. J. Lu wrote:
> > > Convert section relative symbol to absolute shouldn't be a problem
> > > in most cases. If we know it may be a problem at link time, we can
> > > keep it section relative.
> >
> > You keep saying this, but on various platforms it isn't true. Section
> > relative symbols move with an object if it is relocated in any way.
> > Absolute symbols don't.
>
> This isn't true for the common ELF targets. An absolute symbol in a
> shared library is effectively relative to the base of the shared lib.
> A sad consequence of defining syms like _GLOBAL_OFFSET_TABLE_ and
> _DYNAMIC as absolute.
Which I tried to change, you may recall :-) For those platforms which
do care, absolute _G_O_T_ is a serious problem, and there's a knob for
it.
--
Daniel Jacobowitz
CodeSourcery
next prev parent reply other threads:[~2006-09-26 23:53 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-26 14:33 Vivek Goyal
2006-09-26 14:49 ` H. J. Lu
2006-09-26 14:52 ` Vivek Goyal
2006-09-26 15:13 ` H. J. Lu
2006-09-26 15:41 ` Daniel Jacobowitz
2006-09-26 15:54 ` Vivek Goyal
2006-09-26 16:21 ` H. J. Lu
2006-09-26 16:30 ` Vivek Goyal
2006-09-26 16:44 ` H. J. Lu
2006-09-26 16:45 ` Vivek Goyal
2006-09-26 17:01 ` Daniel Jacobowitz
2006-09-26 23:50 ` Alan Modra
2006-09-27 1:51 ` Daniel Jacobowitz [this message]
2006-09-27 3:09 ` Daniel Jacobowitz
2006-09-26 17:48 ` Paul Koning
2006-09-26 23:53 ` Alan Modra
2006-09-28 17:01 ` Paul Brook
2006-09-28 17:05 ` Paul Brook
2006-09-28 18:37 ` H. J. Lu
2006-09-28 18:53 ` H. J. Lu
2006-10-10 16:41 ` Jakub Jelinek
2006-10-10 16:51 ` Jakub Jelinek
2006-10-11 3:52 ` Jakub Jelinek
2006-10-11 7:12 ` Jakub Jelinek
2006-10-11 8:04 ` Alan Modra
2006-10-11 14:08 ` Alan Modra
2006-10-11 14:19 ` Jakub Jelinek
2006-10-11 14:45 ` Jakub Jelinek
2006-10-12 10:18 ` Alan Modra
2006-10-12 14:37 ` Alan Modra
2006-10-13 10:58 ` Jakub Jelinek
2006-10-13 11:10 ` Alan Modra
2006-10-13 11:26 ` Alan Modra
2006-10-17 16:02 ` Dynamic section symbols, ignored output sections Alan Modra
2006-10-19 14:55 ` ligang
2006-10-22 0:25 ` Jakub Jelinek
2006-10-23 14:13 ` Alan Modra
2006-09-29 6:42 ` Linker Bug or Design Intent (Absolute symbols in zero sized sections) Alan Modra
2006-09-29 8:06 ` Alan Modra
2006-09-26 16:14 ` H. J. Lu
2006-09-26 16:40 ` Vivek Goyal
2006-09-26 17:57 ` Vivek Goyal
2006-09-26 20:23 ` H. J. Lu
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