111 lines
3.4 KiB
ArmAsm
111 lines
3.4 KiB
ArmAsm
|
/* $NetBSD: compat_Ovfork.S,v 1.1 2006/03/09 16:20:55 christos Exp $ */
|
||
|
|
|
||
|
|
/*-
|
||
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to Berkeley by
|
||
|
|
* the Systems Programming Group of the University of Utah Computer
|
||
|
|
* Science Department.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. Neither the name of the University nor the names of its contributors
|
||
|
|
* may be used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "SYS.h"
|
||
|
|
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
#if 0
|
||
|
|
RCSID("from: @(#)Ovfork.s 5.1 (Berkeley) 5/12/90")
|
||
|
|
#else
|
||
|
|
RCSID("$NetBSD: compat_Ovfork.S,v 1.1 2006/03/09 16:20:55 christos Exp $")
|
||
|
|
#endif
|
||
|
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* @(#)vfork.s 4.1 (Berkeley) 12/21/80
|
||
|
|
* C library -- vfork
|
||
|
|
*/
|
||
|
|
|
||
|
|
WARN_REFERENCES(vfork, \
|
||
|
|
"warning: reference to compatibility vfork(); include <unistd.h> for correct reference")
|
||
|
|
|
||
|
|
/*
|
||
|
|
* pid = vfork();
|
||
|
|
*
|
||
|
|
* d1 == 0 in parent process, d1 == 1 in child process.
|
||
|
|
* d0 == pid of child in parent, d0 == pid of parent in child.
|
||
|
|
*
|
||
|
|
* trickery here, due to keith sklower, uses ret to clear the stack,
|
||
|
|
* and then returns with a jump indirect, since only one person can return
|
||
|
|
* with a ret off this stack... we do the ret before we vfork!
|
||
|
|
*/
|
||
|
|
|
||
|
|
ENTRY(vfork)
|
||
|
|
movl %sp@+,%a1
|
||
|
|
movl #SYS_vfork,%d0
|
||
|
|
trap #0
|
||
|
|
jcs err
|
||
|
|
subql #1,%d1 /* from 1 to 0 in child, 0 to -1 in parent */
|
||
|
|
andl %d1,%d0
|
||
|
|
jmp %a1@
|
||
|
|
err:
|
||
|
|
#ifdef _REENTRANT
|
||
|
|
.globl _C_LABEL(__errno)
|
||
|
|
movl %a1,%sp@-
|
||
|
|
movl %d0,%sp@-
|
||
|
|
#if defined(PIC) && !defined(__ELF__)
|
||
|
|
movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a1
|
||
|
|
lea %pc@(0,a1:l),%a1
|
||
|
|
movl %a1@(_C_LABEL(__errno):l),%a1
|
||
|
|
jsr %a1@
|
||
|
|
#else
|
||
|
|
jbsr PIC_PLT(_C_LABEL(__errno))
|
||
|
|
#endif /* PIC */
|
||
|
|
#ifdef __SVR4_ABI__
|
||
|
|
movl %sp@+,%a0@
|
||
|
|
#else
|
||
|
|
movl %d0,%a1
|
||
|
|
movl %sp@+,%a1@
|
||
|
|
#endif /* __SVR4_ABI__ */
|
||
|
|
movl %sp@+,%a1
|
||
|
|
#else
|
||
|
|
.globl _C_LABEL(errno)
|
||
|
|
#ifdef PIC
|
||
|
|
#ifdef __ELF__
|
||
|
|
lea %pc@(_GLOBAL_OFFSET_TABLE_@GOTPC),%a0
|
||
|
|
movl %a0@(_C_LABEL(errno)@GOT:w),%a0
|
||
|
|
#else
|
||
|
|
movl #_C_LABEL(_GLOBAL_OFFSET_TABLE_),%a0
|
||
|
|
lea %pc@(0,a0:l),%a0
|
||
|
|
movl %a0@(_C_LABEL(errno):w),%a0
|
||
|
|
#endif
|
||
|
|
movl %d0,%a0@
|
||
|
|
#else
|
||
|
|
movl %d0,_C_LABEL(errno)
|
||
|
|
#endif /* PIC */
|
||
|
|
#endif /* _REENTRANT */
|
||
|
|
moveq #-1,%d0
|
||
|
|
jmp %a1@
|