RFC: HW watchpoints and single stepping for ARMv6/v7

[Russell Haley]

Cool. I have a hummingboard (iMX6). Do I need to know what I'm looking for
or am I just making sure it doesn't explode?

Russ

On Mon, Nov 30, 2015 at 6:41 AM, Zbigniew Bodek <zbb at semihalf.com> wrote:

> Hello again,
>
> It seems that this is the last chance to test this patch on other
> platforms than Rpi, Arndale and Pandaboard.
> Please check out this https://reviews.freebsd.org/D4037
> I will be grateful if you had  a chance to test this on something else
> than the above mentioned.
>
> Best regards
> zbb
>
> 2015-10-31 17:21 GMT+01:00 Zbigniew Bodek <zbb at semihalf.com>:
> > Hello again,
> >
> > I should have post some more information about testing this patch. Here
> it goes:
> > ------------------------------------------------------------------
> > One can enter kernel debugger by one of those:
> >
> > press: ~, ctrl + b
> > or
> > type: sysctl -w debug.kdb.enter=1
> >
> > You can then set a HW watchpoint on any memory location at <address>
> > by invoking following command in KDB:
> > db> hwatch <address>, <size>
> >
> > <size> parameter is optional, the default is 4.
> >
> > To display watchpoints:
> > db> show watch
> >
> > To remove watchpoint:
> > db> dhwatch <address>
> >
> > Press "c" to continue.
> >
> > ------------------------------------------------------------------
> > While in KDB you can step through the kernel code using "s" BUT you
> > need to apply a dependent patch: https://reviews.freebsd.org/D4036
> > otherwise you will cause the kernel panic.
> >
> > Thanks again
> > zbb
> >
> > 2015-10-30 17:25 GMT+01:00 Zbigniew Bodek <zbb at semihalf.com>:
> >> Hello,
> >>
> >> We would like to add HW watchpoints and HW single step support to ARMv6
> kernel.
> >> Please check this review: https://reviews.freebsd.org/D4037
> >>
> >> Since there are differences between debug architectures on ARM (v6,
> >> v6.1, v7, v7.1) I would like to ask for some testing on your machines.
> >> I was able to test this on Pandaboard and Arndale but please check
> >> whether this works on your targets as well.
> >>
> >> Rise a red flag if you see any issues or in worst case scenario -
> >> "undefined instruction" error.
> >>
> >> Best regards
> >> zbb
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