From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 787 invoked by alias); 21 Dec 2009 20:36:40 -0000 Received: (qmail 777 invoked by uid 22791); 21 Dec 2009 20:36:39 -0000 X-SWARE-Spam-Status: No, hits=-2.5 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,SPF_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; Mon, 21 Dec 2009 20:36:34 +0000 Received: from int-mx04.intmail.prod.int.phx2.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.17]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id nBLKaV8c015236 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 21 Dec 2009 15:36:31 -0500 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx04.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id nBLKaUQT019064; Mon, 21 Dec 2009 15:36:30 -0500 Received: from opsy.redhat.com (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 nBLKaTIi025782; Mon, 21 Dec 2009 15:36:30 -0500 Received: by opsy.redhat.com (Postfix, from userid 500) id 777CF3781B0; Mon, 21 Dec 2009 13:36:29 -0700 (MST) From: Tom Tromey To: "Ulrich Weigand" Cc: gdb-patches@sourceware.org Subject: Re: [rfc] Handle DWARF-2 value pieces residing in *parts* of a register References: <200912211532.nBLFWYec026515@d12av02.megacenter.de.ibm.com> Reply-To: tromey@redhat.com Date: Mon, 21 Dec 2009 20:36:00 -0000 In-Reply-To: <200912211532.nBLFWYec026515@d12av02.megacenter.de.ibm.com> (Ulrich Weigand's message of "Mon, 21 Dec 2009 16:32:34 +0100 (CET)") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2009-12/txt/msg00321.txt.bz2 >>>>> "Ulrich" == Ulrich Weigand writes: Ulrich> Now, according to the DWARF-2 standard, the location of register pieces Ulrich> of smaller than full register size is defined by the platform ABI. Ulrich> For the placement of a small value in a *single* register we have a Ulrich> gdbarch callback (gdbarch_value_from_register); maybe we need something Ulrich> like that for value pieces as well. At the very least, we ought to Ulrich> you the same default as default_value_from_register does: assume Ulrich> partial register use implies the least-significant part of the register. Ulrich> The patch below implements this. I think this seems reasonable. It seems straightforward enough to add an arch method if we ever actually need one. I wouldn't worry about it unless we already know of such a machine. Ulrich> a register, assume the least-signficant part is used. Typo, "significant". Tom