Re: TRACE implementation

[sumanth <sumanth dot gundapneni at redpinesignals dot com>]

Hi Michael,
                   Very pleased with the information you provided. 
Still I have certain doubts in mind.
                   Tracepoints can b implemented through either remote 
stubs or gdbserver or gdb agents (byte-coding).
                    Is this 
true?..................................................
                    which can be best suited to me as I am accessing my 
fpga/processor through a parallel port jtag. I dont want to
                   burden my processor by running a server on it.
                   The problem here , I googled in net and I didn't 
even find a single prototype to have a fell of how to trace data(trace 
points)  on my target .

Thanks,
Sumanth G                           

Michael Snyder wrote:
> sumanth wrote:
> > Hi ,
> >
> >        I am talking about "gdb tracepoints" only. I am asking for 
> > "How can I implement them in GDB ?"
>
> Great.  Thanks for the clarification.
> Partial answer: you don't have to implement them in gdb.
> They're already implemented in gdb.
>
> >        means, where I can start with. Heard something about remote stubs 
>
> Yes, that's correct.  GDB already knows how to tell a stub
> to collect trace data.  You need to implement a stub that
> understands the trace commands that gdb will send to it.
>
> >        Michael , Can you be a bit more brief on "published API" which 
> > you mentioned in your last response.
>
> Sure.  First, if you haven't seen this already, you probably
> want to look at it: http://sourceware.org/gdb/talks/esc-west-1999
> There is a white paper, a slide presentation, and other documents.
> It's all old, but not obsolete, since very little additional
> development has been done since then.
>
> Second, the remote protocol messages that your stub will
> need to implement are specified here:
>
> http://sourceware.org/gdb/current/onlinedocs/gdb_37.html#SEC683
>
> I should let you know that some folks at Code Sourcery have
> recently been doing some work with tracepoints.  If you were
> interested in hiring someone to do the work for you on contract,
> either I or one of the other maintainers could probably put you
> in contact with someone privately.
>
> Good luck,
> Michael