Exist tutorial that teaches programming in machine code to FreeBSD?

[françai s]

A FreeBSD developer told me via private message that the most FreeBSD
developers don’t develop in machine code.

The following link leads to tutorial that teaches programming Assembly in
to FreeBSD:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/x86.html

Also exist tutorial that teaches programming in machine code to FreeBSD?