/usr/share/z88dk/lib/z80rules.frame is in z88dk-data 1.8.ds1-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | ld hl,%1 ;const
add hl,sp
call l_gint ;(i%2 %3)
=
ld l,(i%2 %3)
ld h,(i%2 %3+1)
|