Date: Tue, 13 Oct 1998 18:42:52 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Chris Csanady <ccsanady@friley-185-114.res.iastate.edu> Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: kernel traps on boot.. Message-ID: <13859.54457.970518.944699@grasshopper.cs.duke.edu> In-Reply-To: <199810132125.QAA04010@friley-185-114.res.iastate.edu> References: <199810132125.QAA04010@friley-185-114.res.iastate.edu>
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Chris Csanady writes:
> Regardless, should a alignment trap cause the machine to die? I
Yes, as the comment in trap.c says: any unaligned access in the kernel
is a bug.
> think in NetBSD, they just print it to the console. Has anyone
Last I looked, NetBSD panics. Digital UNIX fixes up unaligned
accesses in versions prior to 4.0d.
> else noticed similar behavior?
Yes, although much, much later. Its hitting me at the point of
starting init. I'd thought that it was something of mine own doing --
I'm working on OSF/1 binary compatibility & have locally relocated the
user stack to get it out of /compat/osf1/sbin/loader's way. I'm glad
somebody without my local changes is also having the similar problems.
What's at the faulting pc?
> Not being able to reliably build a kernel makes it really hard
> to get things done. I finally have my GNIC II driver mostly
To hack around it, just make a minor change to trap.c.. Here's a hand
generated diff, complete with whitespace..
***************
*** 219,225 ****
* signalling is appropriate (based on system-wide
* and per-process unaligned-access-handling flags).
*/
! if (user) {
if ((i = unaligned_fixup(a0, a1, a2, p)) == 0)
goto out;
--- 225,231 ----
* signalling is appropriate (based on system-wide
* and per-process unaligned-access-handling flags).
*/
! if (1 || user) {
if ((i = unaligned_fixup(a0, a1, a2, p)) == 0)
goto out;
Drew
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Andrew Gallatin, Sr Systems Programmer http://www.cs.duke.edu/~gallatin
Duke University Email: gallatin@cs.duke.edu
Department of Computer Science Phone: (919) 660-6590
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