Hello Punit, On Wed, Nov 14, 2012 at 8:28 PM, Punit Agrawal <punit.agra...@arm.com> wrote: > Hi Arun, > > You can think of the trace in the ETB as the raw stream resulting from > the multiplexing of different trace streams. So to get to the PTM trace > you'll first have to de-multiplex the stream, and then decode the stream > based on the source - in this case PTM. > > The format of the data stored in the ETB is described in the ETM TRM > Section 9.6 > (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0314h/Bgbhhidd.html). > The decoding should give you a trace stream for each active trace > source. The ATBID can be used to de-multiplex multiple sources, e.g., > the two PTMs associated with the two A9s. > > The PTM stream can then be decoded using the Program Flow Trace Protocol > described in Program Flow Trace Architecture Specification Section 4 > (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ihi0035b/Chddbbdf.html).
So do you mean that there is no open source tool which decodes this as of now and I have to write one? > > Out of curiosity, may I ask what are you trying to do? The main intention is to debug freeze issues using PTM traces. When a device is in freeze, my intention is to collect PTM traces from ETB and decode. So that I ll get traces of last few branches and exceptions. Thanks, Arun > > Hope this helps. Feel free to ask for clarification. > > Cheers, > Punit > > > > > On 14/11/12 14:04, Arun KS wrote: >> >> Hello, >> >> I m trying to capture and decode PTM trace from Cortex A9 dual core. >> >> I m successful in configuring the driver(arch/arm/kernel/etm.c) and >> setting the funnel to get data in ETB. >> But I don't know how to decode these traces. >> >> Anyone has any pointers? >> >> Thanks, >> Arun >> >> _______________________________________________ >> linaro-dev mailing list >> linaro-dev@lists.linaro.org >> http://lists.linaro.org/mailman/listinfo/linaro-dev >> >> >> > > > -- IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
