Re: [Linux-ia64] Exception handling and recovery

From: Keith Owens <>
Date: 2002-03-13 16:22:45
On Tue, 12 Mar 2002 20:51:13 -0800, 
David Mosberger <> wrote:
>>>>>> On Wed, 13 Mar 2002 14:53:31 +1100, Keith Owens <> said:
>  Keith> Unlike i386, the ia64 exception table code only recovers from
>  Keith> invalid user space addresses.  kdb can get other faults which
>  Keith> EX() does not currently allow recovery from.  Is there any
>  Keith> reason why I should not add exception table handling to
>  Keith> ia64_fault(), to generalize the fault recovery mechanism?
>You mean kdb would do get_user() on a bad pointer, which triggers
>ia64_fault() and then you want to search the exception table in
>ia64_fault()?  I think it would be ok to do this (in the KDB patch).

Exactly.  IMHO ia64_fault should always search_exception_table(), even
if kdb is not installed.  Other architectures use exception tables to
detect if the hardware supports extra instructions, registers, MSR
values etc., exception recovery should be general purpose.
Received on Tue Mar 12 21:23:04 2002

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