makecontext(3) on FreeBSD
The text 491806997b0b, as FreeBSD 13.2-RELEASE, FreeBSD 13.1-RELEASE, FreeBSD 13.0-RELEASE shipped it.
modify and exchange user thread contexts
The text 491806997b0b, as FreeBSD 13.2-RELEASE, FreeBSD 13.1-RELEASE, FreeBSD 13.0-RELEASE shipped it.
modify and exchange user thread contexts