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fork.S revision 1.4 
      1  1.4     matt /*	$NetBSD: fork.S,v 1.4 2002/07/30 06:08:00 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  1.3   kleink #ifdef WEAK_ALIAS
     13  1.3   kleink WEAK_ALIAS(fork, _fork)
     14  1.3   kleink #endif
     15  1.3   kleink 
     16  1.3   kleink _SYSCALL(_fork,fork)
     17  1.4     matt 	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
     18  1.4     matt 	and	%r3,%r3,%r4	# return 0 in child, pid in parent
     19  1.1  thorpej 	blr
     20