1 /* $NetBSD: Ovfork.S,v 1.13 2003/08/07 16:42:14 agc Exp $ */
4 * Copyright (c) 1990 The Regents of the University of California.
7 * This code is derived from software contributed to Berkeley by
8 * the Systems Programming Group of the University of Utah Computer
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #if defined(LIBC_SCCS) && !defined(lint)
40 RCSID("from: @(#)Ovfork.s 5.1 (Berkeley) 5/12/90")
42 RCSID("$NetBSD: Ovfork.S,v 1.13 2003/08/07 16:42:14 agc Exp $")
44 #endif /* LIBC_SCCS and not lint */
47 * @(#)vfork.s 4.1 (Berkeley) 12/21/80
51 WARN_REFERENCES(vfork, \
52 "warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
57 * d1 == 0 in parent process, d1 == 1 in child process.
58 * d0 == pid of child in parent, d0 == pid of parent in child.
60 * trickery here, due to keith sklower, uses ret to clear the stack,
61 * and then returns with a jump indirect, since only one person can return
62 * with a ret off this stack... we do the ret before we vfork!
70 subql #1,%d1 /* from 1 to 0 in child, 0 to -1 in parent */
75 .globl _C_LABEL(__errno)
78 #if defined(PIC) && !defined(__ELF__)
79 movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a1
81 movl %a1@(_C_LABEL(__errno):l),%a1
84 jbsr PIC_PLT(_C_LABEL(__errno))
91 #endif /* __SVR4_ABI__ */
94 .globl _C_LABEL(errno)
97 lea %pc@(_GLOBAL_OFFSET_TABLE_@GOTPC),%a0
98 movl %a0@(_C_LABEL(errno)@GOT:w),%a0
100 movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a0
102 movl %a0@(_C_LABEL(errno):w),%a0
106 movl %d0,_C_LABEL(errno)
108 #endif /* _REENTRANT */