1*2fe8fb19SBen Gras/* $NetBSD: __clone.S,v 1.3 2008/04/28 20:22:55 martin Exp $ */ 2*2fe8fb19SBen Gras 3*2fe8fb19SBen Gras/*- 4*2fe8fb19SBen Gras * Copyright (c) 2001 The NetBSD Foundation, Inc. 5*2fe8fb19SBen Gras * All rights reserved. 6*2fe8fb19SBen Gras * 7*2fe8fb19SBen Gras * This code is derived from software contributed to The NetBSD Foundation 8*2fe8fb19SBen Gras * by Jason R. Thorpe. 9*2fe8fb19SBen Gras * 10*2fe8fb19SBen Gras * Redistribution and use in source and binary forms, with or without 11*2fe8fb19SBen Gras * modification, are permitted provided that the following conditions 12*2fe8fb19SBen Gras * are met: 13*2fe8fb19SBen Gras * 1. Redistributions of source code must retain the above copyright 14*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer. 15*2fe8fb19SBen Gras * 2. Redistributions in binary form must reproduce the above copyright 16*2fe8fb19SBen Gras * notice, this list of conditions and the following disclaimer in the 17*2fe8fb19SBen Gras * documentation and/or other materials provided with the distribution. 18*2fe8fb19SBen Gras * 19*2fe8fb19SBen Gras * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20*2fe8fb19SBen Gras * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21*2fe8fb19SBen Gras * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22*2fe8fb19SBen Gras * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23*2fe8fb19SBen Gras * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24*2fe8fb19SBen Gras * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25*2fe8fb19SBen Gras * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26*2fe8fb19SBen Gras * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27*2fe8fb19SBen Gras * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28*2fe8fb19SBen Gras * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29*2fe8fb19SBen Gras * POSSIBILITY OF SUCH DAMAGE. 30*2fe8fb19SBen Gras */ 31*2fe8fb19SBen Gras 32*2fe8fb19SBen Gras#include <sys/errno.h> 33*2fe8fb19SBen Gras 34*2fe8fb19SBen Gras#include "SYS.h" 35*2fe8fb19SBen Gras 36*2fe8fb19SBen Gras#ifdef WEAK_ALIAS 37*2fe8fb19SBen GrasWEAK_ALIAS(clone, __clone) 38*2fe8fb19SBen Gras#endif 39*2fe8fb19SBen Gras 40*2fe8fb19SBen Gras/* 41*2fe8fb19SBen Gras * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 42*2fe8fb19SBen Gras */ 43*2fe8fb19SBen GrasLEAF(__clone, 4) 44*2fe8fb19SBen Gras br pv, 1f 45*2fe8fb19SBen Gras1: LDGP(pv) 46*2fe8fb19SBen Gras 47*2fe8fb19SBen Gras /* 48*2fe8fb19SBen Gras * Sanity checks: func and stack may not be NULL. 49*2fe8fb19SBen Gras */ 50*2fe8fb19SBen Gras beq a0, 9f 51*2fe8fb19SBen Gras beq a1, 9f 52*2fe8fb19SBen Gras 53*2fe8fb19SBen Gras /* 54*2fe8fb19SBen Gras * We need to be able to get at the func and arg arguments 55*2fe8fb19SBen Gras * in the child. Luckily, we have a convenient place to 56*2fe8fb19SBen Gras * do this; the child's stack. 57*2fe8fb19SBen Gras */ 58*2fe8fb19SBen Gras subq a1, 16, a1 59*2fe8fb19SBen Gras stq a0, 0(a1) 60*2fe8fb19SBen Gras stq a3, 8(a1) 61*2fe8fb19SBen Gras 62*2fe8fb19SBen Gras /* 63*2fe8fb19SBen Gras * The system call expects (flags, stack). 64*2fe8fb19SBen Gras */ 65*2fe8fb19SBen Gras mov a2, a0 66*2fe8fb19SBen Gras CALLSYS_ERROR(__clone) 67*2fe8fb19SBen Gras 68*2fe8fb19SBen Gras beq a4, 8f /* a4 (rv[1]) == 0, parent, child pid in v0 */ 69*2fe8fb19SBen Gras 70*2fe8fb19SBen Gras /* 71*2fe8fb19SBen Gras * Fetch the function and argument from the new stack, and 72*2fe8fb19SBen Gras * pop it back. 73*2fe8fb19SBen Gras */ 74*2fe8fb19SBen Gras ldq pv, 0(sp) 75*2fe8fb19SBen Gras ldq a0, 8(sp) 76*2fe8fb19SBen Gras addq sp, 16, sp 77*2fe8fb19SBen Gras 78*2fe8fb19SBen Gras /* Call the clone's entry point. */ 79*2fe8fb19SBen Gras CALL((pv)) 80*2fe8fb19SBen Gras 81*2fe8fb19SBen Gras /* Pass return value to _exit(). */ 82*2fe8fb19SBen Gras mov v0, a0 83*2fe8fb19SBen Gras CALL(_exit) 84*2fe8fb19SBen Gras 85*2fe8fb19SBen Gras /* NOTREACHED */ 86*2fe8fb19SBen Gras 87*2fe8fb19SBen Gras8: RET 88*2fe8fb19SBen Gras 89*2fe8fb19SBen Gras9: ldiq v0, EINVAL 90*2fe8fb19SBen Gras jmp zero, __cerror 91*2fe8fb19SBen Gras END(__clone) 92