From owner-freebsd-hackers Sat Jul 3 7: 6:35 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from smtp1.vnet.net (smtp1.vnet.net [166.82.1.31]) by hub.freebsd.org (Postfix) with ESMTP id 37B9614C46 for ; Sat, 3 Jul 1999 07:06:29 -0700 (PDT) (envelope-from rivers@dignus.com) Received: from dignus.com (ponds.vnet.net [166.82.177.48]) by smtp1.vnet.net (8.9.1a/8.9.1) with ESMTP id KAA10879; Sat, 3 Jul 1999 10:06:44 -0400 (EDT) Received: from lakes.dignus.com (lakes.dignus.com [10.0.0.3]) by dignus.com (8.9.2/8.8.5) with ESMTP id KAA04308; Sat, 3 Jul 1999 10:06:24 -0400 (EDT) Received: (from rivers@localhost) by lakes.dignus.com (8.9.2/8.6.9) id KAA55948; Sat, 3 Jul 1999 10:06:23 -0400 (EDT) Date: Sat, 3 Jul 1999 10:06:23 -0400 (EDT) From: Thomas David Rivers Message-Id: <199907031406.KAA55948@lakes.dignus.com> To: brdean@unx.sas.com, freebsd-hackers@FreeBSD.ORG Subject: Re: support for i386 hardware debug watch points In-Reply-To: <199907031343.JAA13822@dean.pc.sas.com> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > Hi, > > After recently debugging a very elusive memory overwrite problem that > I was only able to find by setting up a debugger watch point, and > suffering through the slowness that this introduced, I began reading > up on the ix86 support for hardware watch points. Using this facility > of the chip would require OS support, and specifically, loading the > debug registers at context switch time. Also, the 'ptrace' system > call could easily be extended to provide an interface for doing this > from user code. > > Is there any interest in supporting something like this in FreeBSD? > I'm volunteering to spend some cycles on this, but I don't want to go > to the effort if there's little chance that the work would be > integrated. > > Thanks, > -Brian > -- > Brian Dean SAS Institute Inc brdean@unx.sas.com > Brian - Scan through the mail archives - I brought this up about this time last year, I think... There were several responses - some people may be willing to assist... - Dave Rivers - To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message