Keep in mind that this is not EMULATION.

The Linux syscalls are just implemented into FreeBSD.

In 1998-1999 they literally used FreeBSD with Linux Abstraction Layer and run Linux apps on FreeBSD instead of using Linux natively because it was faster that way.

Relevant 'press release' here:

- https://www.freebsd.org/press/press-rel-1/

Now! The real exercise would be to run wine for linux in that one (and of course, having FreeBSD running in a Hyper-V VM under Windows :D).