Re: [PATCH] Fix hardware watchpoints on PowerPC servers

Edjunior Barbosa Machado
2013-05-13T14:17:39Z

On 05/13/2013 10:19 AM, Ulrich Weigand wrote:
> So the kernel now reports it supports PPC_DEBUG_FEATURE_DATA_BP_RANGE,
> but then rejects any attempt to set a range BP of more than 8 bytes?
> And there's no way to check for this ahead of time except for checking
> the BookE hwcaps bits? That seems unfortunate ...
>
> But I guess if that's the way the kernel interface is now, we'll have to
> add that check.

Yes, unfortunately this is the info we have from the kernel interface.
booke_debug_info.data_bp_alignment informs the alignment, which, in the
case of current bookS processors, is also the max length for the
watchpoint (8 bytes).

>
>> * ppc-linux-nat.c (ppc_linux_region_ok_for_hw_watchpoint): Check if the
>> region is ok for a hardware watchpoint using the new ptrace interface
>> on Power servers.
>
> This is OK.
>
> As noted by Luis, it would be good to rename the "booke" terminology,
> maybe using something like "have_ptrace_hwdebug" instead of
> have_ptrace_booke_interface. But that should be a separate patch.

I'll work on a patch following these suggestions you and Luis mentioned.

Thanks for the feedback, Ulrich.
--
Edjunior