GCOV for skiboot ================ Unit tests ---------- All unit tests are built+run with gcov enabled. :: make coverage-report will generate a unit test coverage report like: http://open-power.github.io/skiboot/coverage-report/ Skiboot ------- You can now build Skiboot itself with gcov support, boot it on a machine, do things, and then extract out gcda files to generate coverage reports from real hardware (or a simulator). Building Skiboot with GCOV -------------------------- :: SKIBOOT_GCOV=1 make You may need to ``make clean`` first. This will build a skiboot lid roughly *twice* the size. Flash/Install the skiboot.lid and boot. Extracting GCOV data -------------------- The way we extract the gcov data from a system is by dumping the contents of skiboot memory and then parsing the data structures in user space with the extract-gcov utility in the skiboot repo. mambo: :: mysim memory fwrite 0x30000000 0x240000 skiboot.dump FSP: :: getmemproc 30000000 3407872 -fb skiboot.dump linux (e.g. petitboot environment): :: dd if=/proc/kcore skip=1572864 count=6656 of=skiboot.dump You basically need to dump out the first 3MB of skiboot memory. Then you need to find out where the gcov data structures are: :: perl -e "printf '0x%x', 0x30000000 + 0x`grep gcov_info_list skiboot.map|cut -f 1 -d ' '`" That address needs to be supplied to the extract-gcov utility: :: ./extract-gcov skiboot.dump 0x3023ec40 Once you've run extract-gcov, it will have extracted the gcda files from the skiboot memory image. You can then run lcov: :: lcov -b . -q -c -d . -o skiboot-boot.info --gcov-tool /opt/cross/gcc-4.8.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcov *IMPORTANT* you should point lcov to the gcov for the compiler you used to build skiboot, otherwise you're likely to get errors.