While futzing around with rebuilding a kernel, I noticed that
9atom distributed source tree /sys/src/9/port/portfns.h
declares

void* execregs(uintptr, uint, uint)

but /sys/src/9/pc/trap.c declares

long
execregs(ulong entry, ulong ssize, ulong nargs)

which seems to match all the other architectures
I see under /sys/src/9/.

I can't get to http://plan9.bell-labs.com/sources/
right now, it looks to be offline (I hope me looking
at the wiki and man pages via http earlier wasn't
"too high traffic" for it...), but wondered if this was
an oversight in updating portfns.h.

Jim