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Re: [PATCH 2/2] Enable range stepping for ARM on GDBServer


[sigh, I am testing my arm range stepping patches today...]

On Thu, Sep 1, 2016 at 4:59 PM, Pedro Alves <palves@redhat.com> wrote:
>>>
>>>> I'm sorry I can't be more helpful at the moment but I wanted to post
>>>> this issue before I have to leave for a while.
>>>
>>> Understood.  Does enabling range stepping unblock something else?
>>
>> It would unblock ARM tracepoints, as per Yao's requirements...
>
> Tracepoints make gdbserver single-step and then not report the event
> to gdb, so I do see the parallel with range-stepping.  Throwing
> while-stepping into the equation would make it even more clear.
>

Range-stepping makes gdbserver single-step and then not report the event
to gdb if thread pc is within the range.  It is similar to tracepoint, but much
simpler.

Both range-stepping and tracepoing needs to remove reinsert_breakpoint
when gdbserver gets an event but doesn't report it back to gdb.  However,
gdbserver doesn't do so now.  That is the reason I believe we need to
support range-stepping first, and I am working on this (but interrupted by
7.12 release).  The draft patch attached removes reinsert_breakpoint when
gdbserver gets an event but not to report it back to gdb.

Beside "removing reinsert_breakpoint on gdbserver internal event", we'd
better to think that "each backend unwinders don't have to worry about
unavailable data".  I posted a draft here
https://sourceware.org/ml/gdb-patches/2016-05/msg00060.html, I need
some review comments.  Pedro,
can you take a look?  This is not a hard requirement for ARM tracepoint
support.

-- 
Yao (齐尧)

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