1/* $NetBSD: __clone.S,v 1.1 2001/07/23 01:41:25 christos 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 */ 50ENTRY(__clone) 51 save %sp, -96, %sp 52 53 /* 54 * Sanity checks: func and stack may not be NULL. 55 */ 56 tst %i0 57 be 8f ! func == NULL, bail 58 orcc %i1, %g0, %o1 ! setup stack arg for syscall, test 59 be 8f ! stack == NULL, bail 60 mov %i2, %o0 ! setup flags arg for syscall 61 62 /* 63 * Store the function and the argument on our child's stack 64 */ 65 sub %o1, 8, %o1 ! make space on the child's stack 66 st %i0, [%o1] ! save func 67 st %i3, [%o1+4] ! save arg 68 69 /* 70 * Args are now set up for system call as (flags, stack). 71 */ 72 mov SYS___clone, %g1 73 t ST_SYSCALL 74 be 9f 75 tst %o1 ! %o1 (rv[1]) == 0 in parent 76 771: bz 2f ! yes, parent 78 ld [%sp], %l0 ! grab the function 79 ld [%sp+4], %o0 ! and the argument from the stack 80 add %sp, 8, %sp ! restore the stack 81 call %l0 ! Call the clone's entry point. 82 nop 83 84 CALL(_C_LABEL(_exit)) 85 /* NOTREACHED */ 86 872: ret 88 restore %g0, %o0, %o0 89 908: mov EINVAL, %o0 919: ERROR() 92 mov -1, %i0 93 ret 94 restore %g0, -1, %o0 95