Thanks all, Now I understood too more. I found some manuals of the AMD and I saw more some details about debug registers. I'm going to try doing some hacks today. If I have questions I send it again.
> From: [email protected] > To: [email protected] > Subject: Re: Debug registers on FreeBSD > Date: Thu, 18 Feb 2010 10:23:34 -0500 > CC: [email protected]; [email protected] > > On Thursday 18 February 2010 10:12:39 am Kostik Belousov wrote: > > On Thu, Feb 18, 2010 at 09:44:24AM -0500, John Baldwin wrote: > > > On Wednesday 17 February 2010 11:07:36 pm Anderson Eduardo wrote: > > > > > > > > Hello Folks, > > > > > > > > First, I'm starting in the world of the debugging FreeBSD Kernel and, I > > > don't know to use kgdb and ddb properly and, I need set breakpoints using > > > debug register. Those breakpoints in the all tasks. > > > > > > This last might be tricky to accomplish because cpu_switch() will swap out > > > the debug registers if a thread is using them. However, you can easily > > > manage hardware breakpoints from ddb using the 'hwatch' command. It is > > > documented in ddb(4). kgdb doesn't support setting hardware watch points > > > it seems. Note that you can try to use 'db_md_set_watchpoint()' from your > > > kernel module (with DDB compiled into your kernel) if you want to set the > > > address progammatically rather than via the 'hwatch' command in ddb. > > > > I remember that ddb only sets %dr on the CPU it happens to execute. > > Yes, same with the db_md_* callbacks. > > -- > John Baldwin _________________________________________________________________ Quer deixar seus vídeos mais divertidos? Com o Movie Maker isso fica fácil. http://www.windowslive.com.br/public/tip.aspx/view/87?product=4&ocid=Windows Live:Dicas - Movie Maker:Hotmail:Tagline:1x1:Titulo Legendas Creditos_______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
