From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27294 invoked by alias); 26 Apr 2011 18:47:56 -0000 Received: (qmail 27269 invoked by uid 22791); 26 Apr 2011 18:47:55 -0000 X-SWARE-Spam-Status: No, hits=-6.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_HI,SPF_HELO_PASS,T_RP_MATCHES_RCVD 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 Apr 2011 18:47:38 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p3QIlUP3029817 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 26 Apr 2011 14:47:30 -0400 Received: from ns3.rdu.redhat.com (ns3.rdu.redhat.com [10.11.255.199]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p3QIlTKs004091; Tue, 26 Apr 2011 14:47:29 -0400 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 p3QIlS2P025938; Tue, 26 Apr 2011 14:47:29 -0400 Received: by opsy.redhat.com (Postfix, from userid 500) id 70A633781C7; Tue, 26 Apr 2011 12:47:28 -0600 (MDT) From: Tom Tromey To: "Cui\, Dexuan" Cc: "'Mathieu Desnoyers'" , "'ltt-dev\@lists.casi.polymtl.ca'" , "'gdb\@sourceware.org'" Subject: Re: [ltt-dev] gdb-7.2 can't build with lttng-ust-0.12 References: <1865303E0DED764181A9D882DEF65FB6931C75A5AA@shsmsx502.ccr.corp.intel.com> <1865303E0DED764181A9D882DEF65FB6931C75A5AE@shsmsx502.ccr.corp.intel.com> Date: Tue, 26 Apr 2011 18:47:00 -0000 In-Reply-To: <1865303E0DED764181A9D882DEF65FB6931C75A5AE@shsmsx502.ccr.corp.intel.com> (Dexuan Cui's message of "Tue, 26 Apr 2011 09:49:48 +0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org X-SW-Source: 2011-04/txt/msg00150.txt.bz2 >>>>> "Dexuan" == Cui, Dexuan writes: Mathieu> Also, we should reopen the discussion on the way the UST Markers Mathieu> collect the registers for GDB, because the current way involves a Mathieu> _lot_ of ugly assembly code. It should be possible to only use a Mathieu> volatile inline asm to specify input constraints on the target marker Mathieu> parameters, and keep the instruction pointer address that corresponds Mathieu> to this inline asm in a section known by gdb (so gdb could use the Mathieu> drawf info to fetch data from registers/memory). If you can ensure Mathieu> that this would fit gdb's requirements, I could clean up the marker Mathieu> code and we could resync the APIs together. We could also provide Mathieu> this for UST Tracepoints in the same go, with pretty much the same Mathieu> interface as we'd use for UST Markers. I am aware that this would Mathieu> require change on the GDB side, but I think it's better to Mathieu> synchronise our effort rather than to shoot at different targets. I am not totally clear on the proposal here. If this means reusing the stuff, then there are gdb patches already submitted to fully support that; and updating the existing code to also use it should not be very difficult. See gdb-patches from the last month or two. If instead you mean something else, it would be useful to have more information. From your description it sounds like this may be a different design from SDT v3; but note that SDT v2 tried to use DWARF to access the parameters and ran into various problems. I can get details on the failure modes if this is what you intend. Dexuan> Unluckily I'm pretty new to gdb and know few about this now. Dexuan> Let me Cc the gdb mailing list for more thoughts(hope this cross-posting Dexuan> wouldn't bother people). Cross-posting in cases like this is fine, even preferable. I don't know anything about the gdbserver bits here. It seems to me that it would be reasonable to have gdbserver compile against various versions of UST. Tom