Date: Sat, 03 Jul 1999 22:26:24 +0800 From: Peter Wemm <peter@netplex.com.au> To: Thomas David Rivers <rivers@dignus.com> Cc: brdean@unx.sas.com, freebsd-hackers@FreeBSD.ORG Subject: Re: support for i386 hardware debug watch points Message-ID: <19990703142624.ED06C64@overcee.netplex.com.au> In-Reply-To: Your message of "Sat, 03 Jul 1999 10:06:23 -0400." <199907031406.KAA55948@lakes.dignus.com>
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Thomas David Rivers wrote: > > > > 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... I'll chime in.. I'd be quite willing to bring something like this in, assuming it was done reasonably cleanly. It shouldn't be too hard to do it without imparing portability across cpu/arch types. I think this would be quite useful, especially if gdb could be made aware of it too. > - Dave Rivers - Cheers, -Peter -- Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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