hi all, to demonstrate extending gdb to use etm traces for implementing btrace on arm processors, I have made this video available on youtube https://youtu.be/ptKbJRNUqUI users can then have access to process record and replay, on instructions and functions level (https://sourceware.org/gdb/current/onlinedocs/gdb/Process-Record-and-Replay....) and reverse debugging(https://www.gnu.org/software/gdb/news/reversible.html)

we have all functionalities available for intel PT except tracing multi-threaded applications. In this demo I have "reconstructed" the cspr register to enable setting breakpoints in reverse debugging. it is still dirty (adds arm specific register to an architecture agnostic structure) but it shows that it works when implemented properly

Kind Regards Zied Guermazi