From linux(4): The linux module provides limited Linux ABI (application binary inter- face) compatibility for userland applications. The module prov

From linux(4): The linux module provides limited Linux ABI (application binary inter- face) compatibility for userland applications. The module provides the following significant facilities: +o An image activator for correctly branded elf(5) executable images +o Special signal handling for activated images +o Linux to native system call translation It is important to note that the Linux ABI support it not provided through an emulator. Rather, a true (albeit limited) ABI implementation is provided. https://www.freebsd.org/cgi/man.cgi?query=linux&apropos=0&sektion=0&manpath=FreeBSD+10.2-RELEASE&arch=default&format=html https://www.freebsd.org/cgi/man.cgi?query=linux&apropos=0&se... "Mapping syscalls from one OS to another" was really just an example to give the OP an idea of how this sort of thing works without a VM. Edit: Nevermind then