1/* $NetBSD: __clone.S,v 1.1 2001/07/17 00:33:04 thorpej 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 Jason R. Thorpe. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <sys/errno.h> 40 41#include "SYS.h" 42 43#ifdef WEAK_ALIAS 44WEAK_ALIAS(clone, __clone) 45#endif 46 47/* 48 * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 49 */ 50LEAF(__clone, 4) 51 br pv, 1f 521: LDGP(pv) 53 54 /* 55 * Sanity checks: func and stack may not be NULL. 56 */ 57 beq a0, 9f 58 beq a1, 9f 59 60 /* 61 * We need to be able to get at the func and arg aguments 62 * in the child. Luckily, we have a convenient place to 63 * do this; the child's stack. 64 */ 65 subq a1, 16, a1 66 stq a0, 0(a1) 67 stq a3, 8(a1) 68 69 /* 70 * The system call expects (flags, stack). 71 */ 72 mov a2, a0 73 CALLSYS_ERROR(__clone) 74 75 beq a4, 8f /* a4 (rv[1]) == 0, parent, child pid in v0 */ 76 77 /* 78 * Fetch the function and argument from the new stack, and 79 * pop it back. 80 */ 81 ldq pv, 0(sp) 82 ldq a0, 8(sp) 83 addq sp, 16, sp 84 85 /* Call the clone's entry point. */ 86 CALL((pv)) 87 88 /* Pass return value to _exit(). */ 89 mov v0, a0 90 CALL(_exit) 91 92 /* NOTREACHED */ 93 948: RET 95 969: ldiq v0, EINVAL 97 jmp zero, __cerror 98 END(__clone) 99