On Wed, Jun 10, 2009 at 02:38:24PM +0530, K.Prasad wrote:
> Modify Data storage exception code to first lookout for a DABR match before
> recognising a kprobe or xmon exception.
>
> Signed-off-by: K.Prasad <pra...@linux.vnet.ibm.com>
> ---
> arch/powerpc/mm/fault.c | 14 ++++++--------
> 1 file changed, 6 insertions(+), 8 deletions(-)
>
> Index: linux-2.6-tip.hbkpt/arch/powerpc/mm/fault.c
> ===================================================================
> --- linux-2.6-tip.hbkpt.orig/arch/powerpc/mm/fault.c
> +++ linux-2.6-tip.hbkpt/arch/powerpc/mm/fault.c
> @@ -136,6 +136,12 @@ int __kprobes do_page_fault(struct pt_re
> error_code &= 0x48200000;
> else
> is_write = error_code & DSISR_ISSTORE;
> +
> + if (error_code & DSISR_DABRMATCH) {
> + /* DABR match */
> + do_dabr(regs, address, error_code);
> + return 0;
> + }
Again, given the amount of work you're doing on all the breakpoint
paths, I really think you should be rewriting do_dabr(), not just
hooking in around it.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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