1/* $NetBSD: __clone.S,v 1.3 2008/04/28 20:22:58 martin Exp $ */ 2 3/*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas <matt@3am-software.com> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/errno.h> 33 34#include "SYS.h" 35 36#ifdef WEAK_ALIAS 37WEAK_ALIAS(clone, __clone) 38#endif 39 40/* 41 * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 42 */ 43ENTRY(__clone, 0) 44 45 /* 46 * Sanity checks: func and stack may not be NULL. 47 */ 48 movl 4(%ap),%r2 /* check and save function */ 49 beql 9f 50 tstl 8(%ap) /* check stack */ 51 beql 9f 52 53 /* 54 * The system call expects (flags, stack). 55 */ 56 movl 12(%ap),4(%ap) /* XXX this doesn't work for 57 callg with a RO arglist */ 58 movl $2,(%ap) 59 SYSTRAP(__clone) /* only %r0/%r1 munged */ 60 61 blbc %r1,8f /* %r1<0>: 0=parent 1=child */ 62 63 /* Call the clone's entry point. */ 64 pushl 16(%ap) 65 calls $1,(%r2) 66 67 /* Pass return value to _exit(). */ 68 pushl %r0 69 calls $1,_C_LABEL(_exit) 70 71 /* NOTREACHED */ 72 738: ret 74 759: movl $EINVAL,%r0 76 jmp CERROR+2 77