lkml.org 
[lkml]   [2005]   [Oct]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: DIE_GPF vs. DIE_PAGE_FAULT/DIE_TRAP
Date
On Wednesday 26 October 2005 17:21, Jan Beulich wrote:

> Hmm, then this isn't really useful for a debugger. There ought to be a
> chance to filter exceptions early (i.e. debugger accesses to non-mapped
> memory or non-existing MSRs) and a chance to detect bad faults (note
> that the kernel normal exception recovery mechanism may not be usable
> here because for example page faults first try to service the fault
> before scanning the fixup tables, but a debugger will normally not want
> a page-in to happen behind its back). I thought the latter was what gets
> reported as DIE_OOPS, while the former would be the filtering occasions
> (and I actually took the "grossly misnamed" comment in asm/kdebug.h as
> additional indication for that).

All you want is a hook early in GPF, right? I guess that should be ok.
I can see that it's useful on x86-64 due to the non canonical address
fault resulting in GPFs mess.

Just send a patch.

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-10-26 17:52    [W:0.028 / U:0.604 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site