1*ce099b40Smartin/* $NetBSD: __clone.S,v 1.7 2008/04/28 20:22:57 martin Exp $ */ 2f98eeabaSthorpej 3f98eeabaSthorpej/*- 4f98eeabaSthorpej * Copyright (c) 2001 The NetBSD Foundation, Inc. 5f98eeabaSthorpej * All rights reserved. 6f98eeabaSthorpej * 7f98eeabaSthorpej * This code is derived from software contributed to The NetBSD Foundation 8f98eeabaSthorpej * by Jason R. Thorpe. 9f98eeabaSthorpej * 10f98eeabaSthorpej * Redistribution and use in source and binary forms, with or without 11f98eeabaSthorpej * modification, are permitted provided that the following conditions 12f98eeabaSthorpej * are met: 13f98eeabaSthorpej * 1. Redistributions of source code must retain the above copyright 14f98eeabaSthorpej * notice, this list of conditions and the following disclaimer. 15f98eeabaSthorpej * 2. Redistributions in binary form must reproduce the above copyright 16f98eeabaSthorpej * notice, this list of conditions and the following disclaimer in the 17f98eeabaSthorpej * documentation and/or other materials provided with the distribution. 18f98eeabaSthorpej * 19f98eeabaSthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20f98eeabaSthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21f98eeabaSthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22f98eeabaSthorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23f98eeabaSthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24f98eeabaSthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25f98eeabaSthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26f98eeabaSthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27f98eeabaSthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28f98eeabaSthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29f98eeabaSthorpej * POSSIBILITY OF SUCH DAMAGE. 30f98eeabaSthorpej */ 31f98eeabaSthorpej 32f98eeabaSthorpej#include <sys/errno.h> 33f98eeabaSthorpej 34f98eeabaSthorpej#include "SYS.h" 35f98eeabaSthorpej 36f98eeabaSthorpej#ifdef WEAK_ALIAS 37f98eeabaSthorpejWEAK_ALIAS(clone, __clone) 38f98eeabaSthorpej#endif 39f98eeabaSthorpej 40f98eeabaSthorpej/* 41f98eeabaSthorpej * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 42f98eeabaSthorpej */ 43f98eeabaSthorpejENTRY(__clone) 44586bc581Smartin save %sp, -CC64FSZ, %sp 45f98eeabaSthorpej 46f98eeabaSthorpej /* 47f98eeabaSthorpej * Sanity checks: func and stack may not be NULL. 48f98eeabaSthorpej */ 4997ab4e62Smartin brz,pn %i0,8f ! func == NULL, bail 50f98eeabaSthorpej orcc %i1, %g0, %o1 ! setup stack arg for syscall, test 5197ab4e62Smartin bz,pn %xcc, 8f ! stack == NULL, bail 52f98eeabaSthorpej mov %i2, %o0 ! setup flags arg for syscall 53f98eeabaSthorpej 54f98eeabaSthorpej /* 55f666b179Smartin * Allocate "caller's" frame in the child stack as ABI 56f666b179Smartin * requires. Subtract BIAS - it will be 64-bit code. 57f666b179Smartin * 58f666b179Smartin * We pass the function and the argument to the child by 59f666b179Smartin * stashing them at the bottom of the frame. There they are 60f666b179Smartin * safe from window spill would we need to take one as it's 61f666b179Smartin * below the window save area. 62f98eeabaSthorpej */ 63f666b179Smartin sub %o1, CC64FSZ+BIAS, %o1 ! make space 64f666b179Smartin stx %i0, [%o1+CC64FSZ-16+BIAS] ! save func 65f666b179Smartin stx %i3, [%o1+CC64FSZ-8+BIAS] ! save arg 66f98eeabaSthorpej 67f98eeabaSthorpej /* 68f98eeabaSthorpej * Args are now set up for system call as (flags, stack). 69f98eeabaSthorpej */ 70f98eeabaSthorpej mov SYS___clone, %g1 71f98eeabaSthorpej t ST_SYSCALL 7297ab4e62Smartin bcs,pn %xcc, 9f 73f98eeabaSthorpej tst %o1 ! %o1 (rv[1]) == 0 in parent 7497ab4e62Smartin bz %xcc, 2f ! yes, parent 75f666b179Smartin ldx [%sp+CC64FSZ-16+BIAS], %l0 ! grab the function... 76f98eeabaSthorpej call %l0 ! Call the clone's entry point. 77f666b179Smartin ldx [%sp+CC64FSZ-8+BIAS], %o0 ! ...and the argument 78f98eeabaSthorpej 7922abdf82Seeh JUMP(_exit) 80f98eeabaSthorpej /* NOTREACHED */ 81f98eeabaSthorpej 82f98eeabaSthorpej2: ret 83f98eeabaSthorpej restore %g0, %o0, %o0 84f98eeabaSthorpej 8597ab4e62Smartin8: restore %g0, EINVAL, %o0 8697ab4e62Smartin ERROR() 8797ab4e62Smartin /* NOTREACHED */ 8897ab4e62Smartin 8997ab4e62Smartin9: restore %o0, %g0, %o0 9097ab4e62Smartin ERROR() 9197ab4e62Smartin /* NOTREACHED */ 92