Profiling the Cryptech Alpha ============================ Origin ------ This code was copied from https://github.com/ErichStyger/mcuoneclipse.git, directory Examples/KDS/FRDM-K64F120M/FRDM-K64F_Profiling/Profiling, commit 9b7eedddd8b24968128582aedc63be95b61f782c, dated Mon Jan 9 16:56:17 2017 +0100. References ---------- I recommend reading both of these to understand how the profiling code works. [1]: https://mcuoneclipse.com/2015/08/23/tutorial-using-gnu-profiling-gprof-with-arm-cortex-m/ "Tutorial: Using GNU Profiling (gprof) with ARM Cortex-M" [2]: http://bgamari.github.io/posts/2014-10-31-semihosting.html "Semihosting with ARM, GCC, and OpenOCD" How to build ------------ From the top level, run make DO_PROFILING=1 hsm By default, all code is profiled, *except* the profiling code itself, because that would cause fatal recursion. How to run ---------- You need to start OpenOCD on the host, and enable semihosting, at least before you try to use it as a remote file system. I recommend executing the following in the projects/hsm directory, so that gmon.out ends up in the same directory as hsm.elf. Start OpenOCD: $ openocd -f /usr/share/openocd/scripts/board/stm32f4discovery.cfg & Connect to OpenOCD: $ telnet localhost 4444 In the OpenOCD console, enable semihosting: > arm semihosting enable In another window, start the debugger: $ sw/stm32/bin/debug projects/hsm/hsm In the CLI, type `profile start`, then start the unit test or whatever will be exercising the hsm. Afterwards, in the CLI, type `profile stop`. After invoking `profile stop`, it can take several minutes to write gmon.out over OpenOCD to the host. In the projects/hsm directory, run gprof to analyse the gmon.out file: $ gprof hsm.elf >gprof.txt