Assembly code to display "hello " ?
You're aware that this is the very first program anyone learning assembly will have to write, and it's ALWAYS provided in toto by the teaching resource (ie. book, website, or course notes), right?
So either you're lazy to the point that shocks even me, or you need to ask a more specific question.
str: asciz "hello world!"
save %sp, -96, %sp
set str, %o0
call printf, 1
Which assembler and compiler do you use and do you want a 16 program or 32 bit?