__clone.S revision 1.1
11.1Smatt/* $NetBSD: __clone.S,v 1.1 2001/07/20 06:10:12 matt Exp $ */ 21.1Smatt 31.1Smatt/*- 41.1Smatt * Copyright (c) 2001 The NetBSD Foundation, Inc. 51.1Smatt * All rights reserved. 61.1Smatt * 71.1Smatt * This code is derived from software contributed to The NetBSD Foundation 81.1Smatt * by Matt Thomas <matt@3am-software.com> 91.1Smatt * 101.1Smatt * Redistribution and use in source and binary forms, with or without 111.1Smatt * modification, are permitted provided that the following conditions 121.1Smatt * are met: 131.1Smatt * 1. Redistributions of source code must retain the above copyright 141.1Smatt * notice, this list of conditions and the following disclaimer. 151.1Smatt * 2. Redistributions in binary form must reproduce the above copyright 161.1Smatt * notice, this list of conditions and the following disclaimer in the 171.1Smatt * documentation and/or other materials provided with the distribution. 181.1Smatt * 3. All advertising materials mentioning features or use of this software 191.1Smatt * must display the following acknowledgement: 201.1Smatt * This product includes software developed by the NetBSD 211.1Smatt * Foundation, Inc. and its contributors. 221.1Smatt * 4. Neither the name of The NetBSD Foundation nor the names of its 231.1Smatt * contributors may be used to endorse or promote products derived 241.1Smatt * from this software without specific prior written permission. 251.1Smatt * 261.1Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 271.1Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 281.1Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 291.1Smatt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 301.1Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 311.1Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 321.1Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 331.1Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 341.1Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 351.1Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 361.1Smatt * POSSIBILITY OF SUCH DAMAGE. 371.1Smatt */ 381.1Smatt 391.1Smatt#include <sys/errno.h> 401.1Smatt 411.1Smatt#include "SYS.h" 421.1Smatt 431.1Smatt#ifdef WEAK_ALIAS 441.1SmattWEAK_ALIAS(clone, __clone) 451.1Smatt#endif 461.1Smatt 471.1Smatt/* 481.1Smatt * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 491.1Smatt */ 501.1SmattENTRY(__clone, 0) 511.1Smatt 521.1Smatt /* 531.1Smatt * Sanity checks: func and stack may not be NULL. 541.1Smatt */ 551.1Smatt movl 4(ap),r2 /* check and save function */ 561.1Smatt beql 9f 571.1Smatt tstl 8(ap) /* check stack */ 581.1Smatt beql 9f 591.1Smatt 601.1Smatt /* 611.1Smatt * The system call expects (flags, stack). 621.1Smatt */ 631.1Smatt movl 12(ap),4(ap) /* XXX this doesn't work for 641.1Smatt callg with a RO arglist */ 651.1Smatt movl $2,(ap) 661.1Smatt SYSTRAP(__clone) /* only r0/r1 munged */ 671.1Smatt 681.1Smatt blbc r1,8f /* r1<0>: 0=parent 1=child */ 691.1Smatt 701.1Smatt /* Call the clone's entry point. */ 711.1Smatt pushl 16(ap) 721.1Smatt calls $1,(r2) 731.1Smatt 741.1Smatt /* Pass return value to _exit(). */ 751.1Smatt pushl r0 761.1Smatt calls $1,_C_LABEL(_exit) 771.1Smatt 781.1Smatt /* NOTREACHED */ 791.1Smatt 801.1Smatt8: ret 811.1Smatt 821.1Smatt9: movl $EINVAL,r0 831.1Smatt jmp CERROR+2 84