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 _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
