usr/src/libc/sys/pipe.s

# pipe -- C library

#       pipe(f)
#       int f[2];

        .set    pipe,42
.globl  _pipe
.globl  cerror

_pipe:
        .word   0x0000
        chmk    $pipe
        bcc     noerror
        jmp     cerror
noerror:
        movl    4(ap),r2
        movl    r0,(r2)+
        movl    r1,(r2)
        clrl    r0
        ret