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      1 /*	$NetBSD: compat_Ovfork.S,v 1.2 2011/01/15 07:31:13 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 #if defined(LIBC_SCCS)
     13 __RCSID("$NetBSD: compat_Ovfork.S,v 1.2 2011/01/15 07:31:13 matt Exp $")
     14 #endif
     15 
     16 WARN_REFERENCES(vfork, \
     17     "warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
     18 
     19 SYSCALL(vfork)
     20 	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
     21 	and	%r3,%r3,%r4	# return 0 in child, pid in parent
     22 	blr
     23 END(vfork)
     24