ASM OpenBSD

[xa6 at g-Con <xa6 () g-con org>]

Im making a shellcode in linux just for practicing and fun, i have no
problems in linux but when i wanna do something for OpenBSD the syntax
for ASM its very strange in openbsd and i thing its a little complicated
in BSD (like the ____main its so crappy) etc.., my question is , where
can i get a paper related for making shellcodes in openbsd or ASM
programming in openbsd