Home | History | Annotate | Line # | Download | only in sys 
      1 /*	$NetBSD: fork.S,v 1.6 2011/01/15 07:31:13 matt Exp $	*/
      2 
      3 /*
      4  * pid = fork();
      5  *
      6  * r4 == 0 in parent process, 1 in child process.
      7  * r3 == pid of child in parent, pid of parent in child.
      8  */
      9 
     10 #include "SYS.h"
     11 
     12 _SYSCALL(__fork,fork)
     13 	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
     14 	and	%r3,%r3,%r4	# return 0 in child, pid in parent
     15 	blr
     16 END(__fork)
     17