Home | History | Annotate | Line # | Download | only in sys
fork.S revision 1.6 
      1  1.6     matt /*	$NetBSD: fork.S,v 1.6 2011/01/15 07:31:13 matt Exp $	*/
      2  1.1  thorpej 
      3  1.1  thorpej /*
      4  1.1  thorpej  * pid = fork();
      5  1.1  thorpej  *
      6  1.1  thorpej  * r4 == 0 in parent process, 1 in child process.
      7  1.1  thorpej  * r3 == pid of child in parent, pid of parent in child.
      8  1.1  thorpej  */
      9  1.1  thorpej 
     10  1.1  thorpej #include "SYS.h"
     11  1.1  thorpej 
     12  1.5  nathanw _SYSCALL(__fork,fork)
     13  1.4     matt 	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
     14  1.4     matt 	and	%r3,%r3,%r4	# return 0 in child, pid in parent
     15  1.1  thorpej 	blr
     16  1.6     matt END(__fork)
     17