From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gdb-patches-return-82644-listarch-gdb-patches=sources.redhat.com@sourceware.org>
Received: (qmail 25457 invoked by alias); 26 Jul 2011 19:20:26 -0000
Received: (qmail 25449 invoked by uid 22791); 26 Jul 2011 19:20:25 -0000
X-SWARE-Spam-Status: No, hits=-7.5 required=5.0	tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,RP_MATCHES_RCVD,SPF_HELO_PASS
X-Spam-Check-By: sourceware.org
Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 26 Jul 2011 19:19:58 +0000
Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12])	by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p6QJJnh5021727	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK);	Tue, 26 Jul 2011 15:19:49 -0400
Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199])	by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id p6QJJnTP025972;	Tue, 26 Jul 2011 15:19:49 -0400
Received: from barimba (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1])	by ns3.rdu.redhat.com (8.13.8/8.13.8) with ESMTP id p6QJJlKj029495;	Tue, 26 Jul 2011 15:19:47 -0400
From: Tom Tromey <tromey@redhat.com>
To: Pedro Alves <pedro@codesourcery.com>
Cc: gdb-patches@sourceware.org, "H.J. Lu" <hjl.tools@gmail.com>,        Daniel Jacobowitz <drow@false.org>
Subject: Re: RFC: partially available registers
References: <m3vcv6xegp.fsf@fleche.redhat.com>	<m3mxg6w1si.fsf@fleche.redhat.com>	<201107261631.18672.pedro@codesourcery.com>	<201107261707.37547.pedro@codesourcery.com>
Date: Tue, 26 Jul 2011 19:46:00 -0000
In-Reply-To: <201107261707.37547.pedro@codesourcery.com> (Pedro Alves's	message of "Tue, 26 Jul 2011 17:07:37 +0100")
Message-ID: <m3livkq27g.fsf@fleche.redhat.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <gdb-patches.sourceware.org>
List-Subscribe: <mailto:gdb-patches-subscribe@sourceware.org>
List-Archive: <http://sourceware.org/ml/gdb-patches/>
List-Post: <mailto:gdb-patches@sourceware.org>
List-Help: <mailto:gdb-patches-help@sourceware.org>, <http://sourceware.org/ml/#faqs>
Sender: gdb-patches-owner@sourceware.org
X-SW-Source: 2011-07/txt/msg00739.txt.bz2

>>>>> "Pedro" == Pedro Alves <pedro@codesourcery.com> writes:

Pedro> I glanced at:
Pedro>  <http://kerneltrap.org/mailarchive/linux-kernel/2010/2/10/4537101/thread>

Pedro> and now I'm not sure my last assumption with ptrace stopped tasks
Pedro> holds.  If not, then we have two distinct cases to handle -- x87 state
Pedro> has never been accessed; and x87 state in the xsave memory area is
Pedro> not up to date.  Is that true?  Is there a way to distinguish them?
Pedro> Is that what linux puts in the SW usable bytes [464..511]?

I do not know.  I think it would be best if H.J. weighed in on this.

Tom