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compat_Ovfork.S revision 1.1 
      1 /*	$NetBSD: compat_Ovfork.S,v 1.1 2006/02/18 00:21:28 matt Exp $	*/
      2 
      3 /*
      4  * pid = vfork();
      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 WARN_REFERENCES(vfork, \
     13     "warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
     14 
     15 SYSCALL(vfork)
     16 	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
     17 	and	%r3,%r3,%r4	# return 0 in child, pid in parent
     18 	blr
     19