I am progressing in the implementation of the proposal "GDB process record and replay with ARM Coresight" https://lists.linaro.org/pipermail/coresight/2019-July/003021.html

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). and I can collect the traces from the perf mmapped aux area.

For parsing them I needed to gather information about the cpu and etm registers. those are available in the events of type PERF_RECORD_AUXTRACE_INFO in the priv section. priv is a kind of "opaque" data structure where the layout is depending on the perf pmu drivers. the implementation of perf tool gives a good example to follow. I needed also to make a wrapper around opencsd library and again perf was offering a good example to follow.

those are good reasons to think about factoring out the functionality of parsing etm traces on linux system in a dedicated library that can be reused by other software, a kind of libcoresightperf.

is there any plan or ongoing activities for such a library?

Kind Regards

Zied Guermazi