hi all,
I am attaching the patch for the changes done in gdb in order to activate
instructions and functions recording on ARM processors. your feedback and
review comments are welcome.
and for sure if someone is planning to visit the embedded word exhibition and
want to have an exchange concerning this topic, he/she is welcome to drop me an
e-mail to schedule an appointmentKind RegardsZied Guermazi
On Monday, February 17, 2020, 7:23:07 PM GMT+1, Mathieu Poirier
<mathieu.poir...@linaro.org> wrote:
Same comment applies with regards to mailing lists.
On Mon, 17 Feb 2020 at 10:16, zied guermazi <guermazi_z...@yahoo.com> wrote:
>
> Hi Mike, hi Matthieu,
>
> I was too rapid to press the send button, sorry for the inconvienience.
> and yes, it works. I published the source code in github
> (https://github.com/gzied/binutils-gdb/tree/gdb_arm_coresight) ,as well as a
> mail in linaro mailing list
> (https://lists.linaro.org/pipermail/coresight/2020-February/003676.html).
Unfortunately you didn't publish your work in "PATCH" format and as
such it can't be reviewed.
> Eventhough there is still an effort needed to stabilize it for armv7, and
> test it for armv8, I consider this as a breakthough that we can build on the
> top of it.
> I will be visiting Embedded world exhibition between 25th and 27th of
> February in Nuremberg, Germany. are you planning to be there too. I am
> looking forwards to meet you there if possible to discuss possibilities of
> further development and integration in the main stream.
I won't be in Nuremberg next week and I'm pretty sure Mike won't be
there either. Other people on the lists might be around and
interested in meeting with you. Mike and I will be attending Linaro
Connect in Budapest between the 23rd and 27th of March. The Linaro
toolchain group will also be there so it might be the perfect
opportunity to sit down for an hour or so and have a chat.
A good day to you,
Mathieu
>
> Kind Regards
> Zied Guermazi
>
>
>
>
>
> On Monday, February 17, 2020, 06:08:26 PM GMT+1, zied guermazi
> <guermazi_z...@yahoo.com> wrote:
>
>
> Hi Mike, hi Matthieu
> it works!
>
>
>
> On Monday, December 16, 2019, 11:20:20 PM GMT+1, zied guermazi
> <guermazi_z...@yahoo.com> wrote:
>
>
> hi Mike, hi Mathieu
> last few weeks I was able to spend some time on implementing this feature,
> and I want to share the status with you and get your recommendation on
> organizational and technical level.
> so far I was able to use perf events to configure the drivers for etm and
> collect the traces. the code was tested successfully on an STM32MP157A
> discovery kit (arm v7).
> I would like to push this on git, first for review and second for integration
> and creating traction . Do you think it is ok to push it in this status
> (feature partially achieved) ? is linaro gdb git the correct one? who is the
> maintainer of this part of gdb? I do not have an ARMv8 platform to test. who
> can support here?
>
> during the implementation few technical question raised:
> - etm tracing collection requires selecting a trace sink. and I have two
> alternatives: either extending the "record btrace etm" command (used to start
> tracing) with a sink as an argument or extending the command "set record
> btrace" (general configuration of tracing) with etm sink sub-command? (I have
> hard-coded it currently to be able to progress)
> - currently I am hardcoding the path "/sys/bus/event_source/devices/cs_etm/"
> as the default etm source, is this guaranteed to be unique? can we have a
> system with many etm sources enumerated in the sysfs.
>
> for parsing the traces I will need some configuration parameters like the
> content of registers ETMCR, ETMIDR, ETMCCER, ETMTRACEIDR. if my
> understanding of the implementation of perf is correct, it is collecting them
> from the sysfs files located in
> /sys/bus/event_source/devices/cs_etm/cpu0/mgmt/. which are global for the
> system. my question is what will happen if two process are requesting tracing
> at the same time? how to differentiate between traces going to one session
> from the second one? is it possible to get the parameters of a given session
> by some kind of ioctl request to the file descriptor we get out of
> sys_perf_open call?
>
> I will publish those queries in the linaro coresight and gdb forums, I wanted
> first to align with you especially on the organizational issues, before going
> to a bigger round.
>
> Thanks for your support
> Zied Guermazi
>
>
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