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Re: [Qemu-devel] [PATCH] gdbstub: Allow target CPUs to specify watchpoin
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From: |
Max Filippov |
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Subject: |
Re: [Qemu-devel] [PATCH] gdbstub: Allow target CPUs to specify watchpoint STOP_BEFORE_ACCESS flag |
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Date: |
Mon, 15 Sep 2014 22:16:03 -0700 |
On Mon, Sep 15, 2014 at 9:15 PM, Peter Maydell <address@hidden> wrote:
> On 15 September 2014 20:59, Max Filippov <address@hidden> wrote:
>> I've tested xtensa part and have noticed no difference with or without
>> this patch:
>> gdb connected to qemu gdbstub always stops right after the watched
>> instruction.
>> I guess that without this patch I should have seen gdb stopping not right
>> after
>> the watched instruction, but one instruction later, right?
>
> Yes, that is the behaviour I saw on ARM. Perhaps for
> Xtensa gdb thinks it has no watchpoint support at all
> and is using its "singlestep-and-test" fallback?
Hmmm, interesting. Yes, I see gdb single-stepping and reading watched buffer.
With the patch it first stops at the store instruction, without it --
at the next one.
In both cases the following single-step request does nothing. Need to look at
it some more.
--
Thanks.
-- Max