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Re: Porting DTrace to ARM

On Sat, Mar 8, 2014 at 12:51 AM, Matt Thomas <> 
> On Mar 7, 2014, at 2:27 AM, Ryota Ozaki <> wrote:
>> Hi Matt,
>> So my patch for sys/arch/arm is now rather small than
>> so far (just two files); it's minimum code for the core part
>> to run DTrace on ARM.
>> Can you please check it?
>> The patch for sys/arch/arm is
>> The full patch is available at the usual place:
>> Best regards,
>>  ozaki-r
> In undefined_init, the KDTRACE_HOOK should be after und_ev.ev_count++.

I see. Fixed.

Any other problem?

> Digression ahead.
> I wonder if it wouldn't be better to use a BKPT instruction on armv5t
> and later and avoid the undefined trap, and use a prefetch abort with
> a known FSR code.  For pre-armv5t, we'd need a undefined handler but
> we have one of those now.  BKPT instructions have either a 16-bit (ARM)
> or 8-bit (thumb) value encoded within.
> But that can be tackled later.

Actually this is not so digression because my next target is armv5t...

Anyway thanks a lot for checking!

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