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fork.S revision 1.2 
      1  1.2  matt /*	$NetBSD: fork.S,v 1.2 2014/08/23 02:24:22 matt Exp $	*/
      2  1.1  ross 
      3  1.1  ross /*
      4  1.1  ross  * pid = fork();
      5  1.1  ross  *
      6  1.1  ross  * r4 == 0 in parent process, 1 in child process.
      7  1.1  ross  * r3 == pid of child in parent, pid of parent in child.
      8  1.1  ross  */
      9  1.1  ross 
     10  1.1  ross #include "SYS.h"
     11  1.1  ross 
     12  1.1  ross _SYSCALL(__fork,fork)
     13  1.1  ross 	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
     14  1.1  ross 	and	%r3,%r3,%r4	# return 0 in child, pid in parent
     15  1.1  ross 	blr
     16  1.2  matt END(__fork)
     17