11.2Sryo/* $NetBSD: __clone.S,v 1.2 2018/11/22 08:30:58 ryo Exp $ */ 21.1Smatt 31.1Smatt/*- 41.1Smatt * Copyright (c) 2014 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 of 3am Software Foundry. 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 * 191.1Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.1Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.1Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.1Smatt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.1Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.1Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.1Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.1Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.1Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.1Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.1Smatt * POSSIBILITY OF SUCH DAMAGE. 301.1Smatt */ 311.1Smatt 321.1Smatt#include "SYS.h" 331.1Smatt#include <sys/errno.h> 341.1Smatt 351.1SmattWEAK_ALIAS(clone, __clone) 361.1Smatt 371.1Smatt/* 381.1Smatt * int __clone(int (*fn)(void *), void *stack, int flags, void *arg); 391.1Smatt */ 401.1SmattENTRY(__clone) 411.1Smatt 421.1Smatt /* test stack and function are not null */ 431.1Smatt cbz x0, .Leinval 441.1Smatt cbz x1, .Leinval 451.1Smatt 461.1Smatt /* place the arg and func onto the child's stack */ 471.1Smatt stp x3, x0, [x1, #-16]! 481.1Smatt 491.1Smatt /* syscall expects (flags, stack) */ 501.1Smatt mov x0, x2 511.1Smatt 521.1Smatt SYSTRAP(__clone) 531.1Smatt _INVOKE_CERROR() 541.1Smatt 551.1Smatt /* 561.1Smatt * x1 and x0 are the same as from fork: 571.1Smatt * x1 == 0 in parent process, x1 == 1 in child process. 581.1Smatt * x0 == pid of child in parent, x0 == pid of parent in child. 591.1Smatt */ 601.1Smatt /* if this is the parent then just return the pid */ 611.2Sryo cbz x1, 1f 621.1Smatt 631.1Smatt /* 641.1Smatt * This is the child 651.1Smatt * load the function and arg off the stack 661.1Smatt */ 671.1Smatt ldp x0, x1, [sp], #16 681.1Smatt 691.1Smatt /* call the function */ 701.1Smatt blr x1 711.1Smatt 721.1Smatt /* call _exit with the returned value */ 731.1Smatt bl _C_LABEL(_exit) 741.1Smatt1: ret 751.1Smatt.Leinval: 761.1Smatt mov x0, #EINVAL 771.1Smatt b _C_LABEL(__cerror) 781.1SmattEND(__clone) 79