junsu's multiplatform FreeBSD Kernel GCOV patch
It can be obtained here:
http://www.arbornet.org/~junsu/gcov.diff
gcov is a part of gcc. If I did not misunderstood, kernbb can do something similiar, while it is not so convinent.
Here is some useful information from jkoshy.
在线阅读本文并参与讨论 delphij's Chaos https://blog.delphij.net/posts/2004/02/junsus-multipla/