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      1  1.2  matt /*	$NetBSD: compat_Ovfork.S,v 1.2 2011/01/15 07:31:13 matt Exp $	*/
      2  1.1  matt 
      3  1.1  matt /*
      4  1.1  matt  * pid = vfork();
      5  1.1  matt  *
      6  1.1  matt  * r4 == 0 in parent process, 1 in child process.
      7  1.1  matt  * r3 == pid of child in parent, pid of parent in child.
      8  1.1  matt  */
      9  1.1  matt 
     10  1.1  matt #include "SYS.h"
     11  1.1  matt 
     12  1.2  matt #if defined(LIBC_SCCS)
     13  1.2  matt __RCSID("$NetBSD: compat_Ovfork.S,v 1.2 2011/01/15 07:31:13 matt Exp $")
     14  1.2  matt #endif
     15  1.2  matt 
     16  1.1  matt WARN_REFERENCES(vfork, \
     17  1.1  matt     "warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
     18  1.1  matt 
     19  1.1  matt SYSCALL(vfork)
     20  1.1  matt 	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
     21  1.1  matt 	and	%r3,%r3,%r4	# return 0 in child, pid in parent
     22  1.1  matt 	blr
     23  1.2  matt END(vfork)
     24