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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.
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