Date: Sat, 23 Nov 2002 23:46:41 +0000 From: Doug Rabson <dfr@nlsystems.com> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: Perforce Change Reviews <perforce@freebsd.org> Subject: Re: PERFORCE change 21417 for review Message-ID: <200211232346.41171.dfr@nlsystems.com> In-Reply-To: <20021123230017.GB8744@dhcp01.pn.xcllnt.net> References: <200211232017.gANKHAAk090869@repoman.freebsd.org> <200211232250.38412.dfr@nlsystems.com> <20021123230017.GB8744@dhcp01.pn.xcllnt.net>
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On Saturday 23 November 2002 11:00 pm, Marcel Moolenaar wrote: > On Sat, Nov 23, 2002 at 10:50:38PM +0000, Doug Rabson wrote: > > On Saturday 23 November 2002 8:17 pm, Marcel Moolenaar wrote: > > > http://perforce.freebsd.org/chv.cgi?CH=3D21417 > > > > > > Change 21417 by marcel@marcel_nfs on 2002/11/23 12:17:09 > > > > > > =09Raw, untested implementation of EPC syscalls. > > > > This seems to be missing the bit after calling syscall() which > > checks for a full exception_restore, e.g. after an execve and also > > the check for calling ast(), e.g. after a signal. > > Yes. > > [snip] > > > One other thing after re-familiarising myself with exception.s. You > > have added unwind records to all the kernel IVT entry points. This > > is quite unhelpful when trying to debug kernel faults. The previous > > version which manually unwound past the exception to the code which > > faulted was extremely useful and saved me a lot of time in > > debugging. Can we have it back please :-). > > If we want to use unwinding to get to the register state of the > process, we can never unwind over the exception code. It's probably > much easier to restart unwinding after it stopped at the exception > entry point. This would also hold for signal handlers. Would a DDB > command to resume unwinding work? I think it would be ok to just put back the code in db_stack_trace_cmd()=20 which spots kernel entry points and resets the unwind state based on=20 the contents of the appropriate stack frame. That would give complete=20 stack traces in DDB without disturbing the real unwind records. --=20 Doug Rabson=09=09=09=09Mail: dfr@nlsystems.com =09=09=09=09=09Phone: +44 20 8348 6160 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe p4-projects" in the body of the message
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