linux-kernel - Re: [patch 16/21] Xen-paravirt: Add code into head.S to handle being booted by Xen

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Message-ID: <m1ire4nqqy.fsf@ebiederm.dsl.xmission.com>
Date:	Wed, 14 Feb 2007 18:39:33 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <ak@....de>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Ian Campbell <Ian.Campbell@...Source.com>
Subject: Re: [patch 16/21] Xen-paravirt: Add code into head.S to handle being booted by Xen

Jeremy Fitzhardinge <jeremy@...p.org> writes:

> Eric W. Biederman wrote:
>> Ok.  If that is all this may be a difference that makes no difference.
>> binutils has a bad habit of looking at sections (which are fully
>> optional) instead of segments on ET_EXEC and ET_DYN objects.  Only
>> ET_REL objects (.o files) are required to have sections.
>>   
>
> The Xen domain loader will have to be changed to deal with that, which
> isn't too much of a problem.

Ok.  Please fix the Xen domain loader to not look at sections.  It
is a bug for any kind of executable loader to look at anything other
then segments.

> My main concern is the randomness of it, and whether it will fail in
> some more harmful way on other versions of binutils.

Reasonable and it's probably worth letting the binutils developer know.
I do agree that it is weird.   It might be that something in binutils
doesn't like us dropping some of the notes.

>> So I recommend for testing write a 100 line program that includes
>> elf.h and reads out the note segment.  If all is well we can split
>> this code out.
>>   
>
> The Xen readnotes utility is essentially that.  I'll hack it.

Sounds good.

Eric
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