xref: /minix3/lib/libc/compat/arch/powerpc/sys/compat_Ovfork.S (revision 2fe8fb192fe7e8720e3e7a77f928da545e872a6a)
1*2fe8fb19SBen Gras/*	$NetBSD: compat_Ovfork.S,v 1.2 2011/01/15 07:31:13 matt Exp $	*/
2*2fe8fb19SBen Gras
3*2fe8fb19SBen Gras/*
4*2fe8fb19SBen Gras * pid = vfork();
5*2fe8fb19SBen Gras *
6*2fe8fb19SBen Gras * r4 == 0 in parent process, 1 in child process.
7*2fe8fb19SBen Gras * r3 == pid of child in parent, pid of parent in child.
8*2fe8fb19SBen Gras */
9*2fe8fb19SBen Gras
10*2fe8fb19SBen Gras#include "SYS.h"
11*2fe8fb19SBen Gras
12*2fe8fb19SBen Gras#if defined(LIBC_SCCS)
13*2fe8fb19SBen Gras__RCSID("$NetBSD: compat_Ovfork.S,v 1.2 2011/01/15 07:31:13 matt Exp $")
14*2fe8fb19SBen Gras#endif
15*2fe8fb19SBen Gras
16*2fe8fb19SBen GrasWARN_REFERENCES(vfork, \
17*2fe8fb19SBen Gras    "warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
18*2fe8fb19SBen Gras
19*2fe8fb19SBen GrasSYSCALL(vfork)
20*2fe8fb19SBen Gras	addi	%r4,%r4,-1	# from 1 to 0 in child, 0 to -1 in parent
21*2fe8fb19SBen Gras	and	%r3,%r3,%r4	# return 0 in child, pid in parent
22*2fe8fb19SBen Gras	blr
23*2fe8fb19SBen GrasEND(vfork)
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