1/* $NetBSD: __clone.S,v 1.3 2008/04/28 20:22:55 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#include <sys/errno.h> 33 34#include "SYS.h" 35 36#ifdef WEAK_ALIAS 37WEAK_ALIAS(clone, __clone) 38#endif 39 40/* 41 * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 42 */ 43LEAF(__clone, 4) 44 br pv, 1f 451: LDGP(pv) 46 47 /* 48 * Sanity checks: func and stack may not be NULL. 49 */ 50 beq a0, 9f 51 beq a1, 9f 52 53 /* 54 * We need to be able to get at the func and arg arguments 55 * in the child. Luckily, we have a convenient place to 56 * do this; the child's stack. 57 */ 58 subq a1, 16, a1 59 stq a0, 0(a1) 60 stq a3, 8(a1) 61 62 /* 63 * The system call expects (flags, stack). 64 */ 65 mov a2, a0 66 CALLSYS_ERROR(__clone) 67 68 beq a4, 8f /* a4 (rv[1]) == 0, parent, child pid in v0 */ 69 70 /* 71 * Fetch the function and argument from the new stack, and 72 * pop it back. 73 */ 74 ldq pv, 0(sp) 75 ldq a0, 8(sp) 76 addq sp, 16, sp 77 78 /* Call the clone's entry point. */ 79 CALL((pv)) 80 81 /* Pass return value to _exit(). */ 82 mov v0, a0 83 CALL(_exit) 84 85 /* NOTREACHED */ 86 878: RET 88 899: ldiq v0, EINVAL 90 jmp zero, __cerror 91 END(__clone) 92