[PATCH] powerpc ptrace block-step

[Josh Boyer]

On Thu, Apr 02, 2009 at 05:44:50PM -0700, Roland McGrath wrote:
>> The patch only implements it for "server/classic" processors, not BookE,
>> thus it should probably only advertise it for these :-)
>>
>> Though it wouldn't be too hard to implement it for BookE using DBCR0:BRT
>> (Branch Taken debug event) though it might need some careful fixups such
>> as the one we have for single step regarding hitting exception entry
>> code.
>
>In that case, this code seems fairly mysterious:
>
>> > +#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
>> > +		task->thread.dbcr0 = DBCR0_IDM | DBCR0_BT;
>> > +		regs->msr |= MSR_DE;
>
>That doesn't already do whatever it is you described?
>
>Can we assume now that you or someone else who knows what all that means
>will take this up?

I will try and look at the patch a bit more tomorrow, yes.

I don't think having it working for BookE is really a requirement before this
gets in though.  If we can get it working with minimal effort for ppc64, that
would help get systemtap and related things functioning correctly there.

While I would love to believe that systemtap should work everywhere, I can't
really see it running on an embedded board at this point.

josh