1/* $NetBSD: __clone.S,v 1.6 2006/12/27 13:40:56 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, -CC64FSZ, %sp 52 53 /* 54 * Sanity checks: func and stack may not be NULL. 55 */ 56 brz,pn %i0,8f ! func == NULL, bail 57 orcc %i1, %g0, %o1 ! setup stack arg for syscall, test 58 bz,pn %xcc, 8f ! stack == NULL, bail 59 mov %i2, %o0 ! setup flags arg for syscall 60 61 /* 62 * Allocate "caller's" frame in the child stack as ABI 63 * requires. Subtract BIAS - it will be 64-bit code. 64 * 65 * We pass the function and the argument to the child by 66 * stashing them at the bottom of the frame. There they are 67 * safe from window spill would we need to take one as it's 68 * below the window save area. 69 */ 70 sub %o1, CC64FSZ+BIAS, %o1 ! make space 71 stx %i0, [%o1+CC64FSZ-16+BIAS] ! save func 72 stx %i3, [%o1+CC64FSZ-8+BIAS] ! save arg 73 74 /* 75 * Args are now set up for system call as (flags, stack). 76 */ 77 mov SYS___clone, %g1 78 t ST_SYSCALL 79 bcs,pn %xcc, 9f 80 tst %o1 ! %o1 (rv[1]) == 0 in parent 81 bz %xcc, 2f ! yes, parent 82 ldx [%sp+CC64FSZ-16+BIAS], %l0 ! grab the function... 83 call %l0 ! Call the clone's entry point. 84 ldx [%sp+CC64FSZ-8+BIAS], %o0 ! ...and the argument 85 86 JUMP(_exit) 87 /* NOTREACHED */ 88 892: ret 90 restore %g0, %o0, %o0 91 928: restore %g0, EINVAL, %o0 93 ERROR() 94 /* NOTREACHED */ 95 969: restore %o0, %g0, %o0 97 ERROR() 98 /* NOTREACHED */ 99