1/* $NetBSD: __clone.S,v 1.5 2006/12/28 17:46:03 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 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, -CCFSZ, %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 * Allocate "caller's" frame in the child stack as ABI 64 * requires. 65 * 66 * We pass the function and the argument to the child by 67 * stashing them at the bottom of the frame. There they are 68 * safe from window spill would we need to take one as it's 69 * below the window save area. 70 */ 71 sub %o1, CCFSZ, %o1 ! make space on the child's stack 72 st %i0, [%o1+CCFSZ-8] ! save func 73 st %i3, [%o1+CCFSZ-4] ! save arg 74 75 /* 76 * Args are now set up for system call as (flags, stack). 77 */ 78 mov SYS___clone, %g1 79 t ST_SYSCALL 80 bcs 9f 81 tst %o1 ! %o1 (rv[1]) == 0 in parent 82 831: bz 2f ! yes, parent 84 ld [%sp+CCFSZ-8], %l0 ! grab the function... 85 call %l0 ! Call the clone's entry point. 86 ld [%sp+CCFSZ-4], %o0 ! ...and the argument from the stack 87 88 CALL(_C_LABEL(_exit)) 89 /* NOTREACHED */ 90 912: ret 92 restore %g0, %o0, %o0 93 948: restore %g0, EINVAL, %o0 95 ERROR() 96 /* NOTREACHED */ 97 989: restore %g0, %o0, %o0 99 ERROR() 100 /* NOTREACHED */ 101