Re: Remote Serial Protocol -- reply to '?' when target running

Michael Eager
2016-08-09T19:33:20Z

On 08/09/2016 12:27 PM, taylor, david wrote:
>
>> From: Michael Eager [mailto:eager@eagerm.com]
>> Sent: Tuesday, August 09, 2016 3:08 PM
>> To: taylor, david; gdb@sourceware.org
>> Subject: Re: Remote Serial Protocol -- reply to '?' when target running
>>
>> On 08/09/2016 11:40 AM, taylor, david wrote:
>>>> From: gdb-owner@sourceware.org [mailto:gdb-owner@sourceware.org]
>> On
>>>> Behalf Of Michael Eager
>
>> The JTAG pod I'm using does not respond with "QNonStop+" in response
>> to "qSupported". Perhaps it should.
>
> Our stub sets it and I also do 'set non-stop on' in my .gdbinit file. The entry in
> my .gdbinit might predate the stub returning it, I don't recall.
>
>> The JTAG pod does respond to '?' with OK. After a few other exchanges,
>> gdb goes into a wait, waiting to receive something from the target.
>>
>> What do you do? Send a stop reply packet when the target stops?
>
> Our target typically has 80-110 threads when I connect.
> We support asynchronous notifications as well.
>
> When GDB connects to the target, a thread is created to service GDB.
> If multiple GDB's connect, multiple threads get created -- each dedicated
> to a specific GDB.
>
> There's also a networking thread and a bunch of other threads.
>
> Our target never stops. Individual threads? Yes. The target as a whole? No.

Thanks.

--
Michael Eager eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306 650-325-8077