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fork.S revision 1.2.10.1 
      1  1.2.10.1   kleink /*	$NetBSD: fork.S,v 1.2.10.1 2000/08/22 07:17:06 kleink 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  1.2.10.1   kleink #ifdef WEAK_ALIAS
     13  1.2.10.1   kleink WEAK_ALIAS(fork, _fork)
     14  1.2.10.1   kleink #endif
     15  1.2.10.1   kleink 
     16  1.2.10.1   kleink _SYSCALL(_fork,fork)
     17       1.1  thorpej 	addi	4,4,-1		# from 1 to 0 in child, 0 to -1 in parent
     18       1.1  thorpej 	and	3,3,4		# return 0 in child, pid in parent
     19       1.1  thorpej 	blr
     20