18269e767SBrooks Davis/* $NetBSD: Ovfork.S,v 1.6 2003/08/07 16:42:03 agc Exp $ */ 28269e767SBrooks Davis 38269e767SBrooks Davis/*- 48269e767SBrooks Davis * Copyright (c) 1990 The Regents of the University of California. 58269e767SBrooks Davis * All rights reserved. 68269e767SBrooks Davis * 78269e767SBrooks Davis * Redistribution and use in source and binary forms, with or without 88269e767SBrooks Davis * modification, are permitted provided that the following conditions 98269e767SBrooks Davis * are met: 108269e767SBrooks Davis * 1. Redistributions of source code must retain the above copyright 118269e767SBrooks Davis * notice, this list of conditions and the following disclaimer. 128269e767SBrooks Davis * 2. Redistributions in binary form must reproduce the above copyright 138269e767SBrooks Davis * notice, this list of conditions and the following disclaimer in the 148269e767SBrooks Davis * documentation and/or other materials provided with the distribution. 158269e767SBrooks Davis * 3. Neither the name of the University nor the names of its contributors 168269e767SBrooks Davis * may be used to endorse or promote products derived from this software 178269e767SBrooks Davis * without specific prior written permission. 188269e767SBrooks Davis * 198269e767SBrooks Davis * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 208269e767SBrooks Davis * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 218269e767SBrooks Davis * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 228269e767SBrooks Davis * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 238269e767SBrooks Davis * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 248269e767SBrooks Davis * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 258269e767SBrooks Davis * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 268269e767SBrooks Davis * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 278269e767SBrooks Davis * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 288269e767SBrooks Davis * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 298269e767SBrooks Davis * SUCH DAMAGE. 308269e767SBrooks Davis */ 318269e767SBrooks Davis 328269e767SBrooks Davis#include <machine/asm.h> 338269e767SBrooks Davis#include "SYS.h" 348269e767SBrooks Davis 358269e767SBrooks Davis/* 368269e767SBrooks Davis * pid = vfork(); 378269e767SBrooks Davis * 388269e767SBrooks Davis * On return from the SWI: 398269e767SBrooks Davis * r1 == 0 in parent process, r1 == 1 in child process. 408269e767SBrooks Davis * r0 == pid of child in parent, r0 == pid of parent in child. 418269e767SBrooks Davis */ 428269e767SBrooks Davis .text 438269e767SBrooks Davis .align 0 448269e767SBrooks Davis 4580ffc739SBrooks DavisENTRY(__sys_vfork) 4680ffc739SBrooks Davis .weak _C_LABEL(vfork); 4780ffc739SBrooks Davis .set _C_LABEL(vfork), _C_LABEL(__sys_vfork); 4880ffc739SBrooks Davis .weak _C_LABEL(_vfork); 4980ffc739SBrooks Davis .set _C_LABEL(_vfork), _C_LABEL(__sys_vfork); 508269e767SBrooks Davis mov r2, r14 518269e767SBrooks Davis _SYSCALL(vfork) 528269e767SBrooks Davis bcs PIC_SYM(CERROR, PLT) 538269e767SBrooks Davis sub r1, r1, #1 /* r1 == 0xffffffff if parent, 0 if child */ 548269e767SBrooks Davis and r0, r0, r1 /* r0 == 0 if child, else unchanged */ 558269e767SBrooks Davis mov r15, r2 5680ffc739SBrooks DavisEND(__sys_vfork) 578269e767SBrooks Davis 588269e767SBrooks Davis .section .note.GNU-stack,"",%progbits 59