From owner-freebsd-arch@freebsd.org Tue Aug 4 19:01:00 2015 Return-Path: Delivered-To: freebsd-arch@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 46D5D9957BF for ; Tue, 4 Aug 2015 19:01:00 +0000 (UTC) (envelope-from jmg@gold.funkthat.com) Received: from gold.funkthat.com (gate2.funkthat.com [208.87.223.18]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "gold.funkthat.com", Issuer "gold.funkthat.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 2C3681DEF; Tue, 4 Aug 2015 19:00:59 +0000 (UTC) (envelope-from jmg@gold.funkthat.com) Received: from gold.funkthat.com (localhost [127.0.0.1]) by gold.funkthat.com (8.14.5/8.14.5) with ESMTP id t74J0xa0031776 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 4 Aug 2015 12:00:59 -0700 (PDT) (envelope-from jmg@gold.funkthat.com) Received: (from jmg@localhost) by gold.funkthat.com (8.14.5/8.14.5/Submit) id t74J0xmq031775; Tue, 4 Aug 2015 12:00:59 -0700 (PDT) (envelope-from jmg) Date: Tue, 4 Aug 2015 12:00:59 -0700 From: John-Mark Gurney To: John Baldwin Cc: "'freebsd-arch'" Subject: Re: Supporting cross-debugging vmcores in libkvm Message-ID: <20150804190058.GM78154@funkthat.com> References: <3121152.ujdxFEovO3@ralph.baldwin.cx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3121152.ujdxFEovO3@ralph.baldwin.cx> X-Operating-System: FreeBSD 9.1-PRERELEASE amd64 X-PGP-Fingerprint: 54BA 873B 6515 3F10 9E88 9322 9CB1 8F74 6D3F A396 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html X-TipJar: bitcoin:13Qmb6AeTgQecazTWph4XasEsP7nGRbAPE X-to-the-FBI-CIA-and-NSA: HI! HOW YA DOIN? can i haz chizburger? User-Agent: Mutt/1.5.21 (2010-09-15) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (gold.funkthat.com [127.0.0.1]); Tue, 04 Aug 2015 12:00:59 -0700 (PDT) X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Aug 2015 19:01:00 -0000 John Baldwin wrote this message on Tue, Aug 04, 2015 at 10:56 -0700: > Many debuggers (recent gdb and lldb) support cross-architecture debugging > just fine. My current WIP port of kgdb to gdb7 supports cross-debugging for > remote targets already, but I wanted it to also support cross-debugging for > vmcores. Have you looked at the work the my GSoC student, Daniel Lovasko, is doing: https://wiki.freebsd.org/SummerOfCode2015/TypeAwareKernelVirtualMemoryAccess This uses libctf to completely abstract out the accessing of data in libkvm so that it can be used w/ any arch as long as you have ctf data... This means you could use netstat on amd64 on an armeb vmcore w/o issues... It does look like some of this is still useful, but want to make sure that we aren't reproducing tons of work... For example, he's working on procstat right now: https://github.com/lovasko/taprocstat -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."