Code Coverage
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The wiki is being retired!
Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to https://doc.coreboot.org/. Contributions welcome!
Prerequisites
You need
- The code coverage patch for coreboot: http://review.coreboot.org/#/c/2052/
- The latest version of lcov: http://ltp.cvs.sourceforge.net/viewvc/ltp/utils/analysis/lcov/?view=tar
Getting started
- Install lcov. You will need to patch geninfo to make it work with the coreboot toolchain:
--- bin/geninfo 2012-11-13 01:58:53.000000000 -0800
+++ bin/geninfo 2013-01-08 16:44:48.041362229 -0800
@@ -1871,7 +1871,7 @@
close(GCOV_PIPE);
$result = 0;
- if ($version_string =~ /(\d+)\.(\d+)(\.(\d+))?/)
+ if ($version_string =~ /(\d+)\.(\d+)(\.(\d+))$/)
{
if (defined($4))
{
Getting code coverage information
- Compile coreboot with CONFIG_COVERAGE enabled
- Flash and run coreboot on the target system
- Run cbmem on the target system to extract coverage data (see coreboot/util/cbmem/)
$ sudo ./cbmem -CV
- Transfer the files back to your host system
- Run lcov and genhtml on the host system
$ lcov --capture --directory $( pwd ) --output-file coreboot.info --gcov-tool i386-elf-gcov $ genhtml coreboot.info --output-directory coreboot-coverage
- Find your html files visualizing code coverage in coreboot-coverage
Demo
http://www.coreboot.org/~stepan/coreboot-coverage/