1/* $NetBSD: __clone.S,v 1.5 2014/05/22 15:01:57 uebayasi Exp $ */ 2 3/* 4 * Copyright (c) 2002 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Frank van der Linden for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38#include <machine/asm.h> 39#include <sys/errno.h> 40#include "SYS.h" 41 42#ifdef WEAK_ALIAS 43WEAK_ALIAS(clone, __clone) 44#endif 45 .text 46 47/* 48 * int clone(int (*fn)(void *), void *stack, int flags, void *arg); 49 */ 50ENTRY(__clone) 51 pushq %r12 52 pushq %r13 53 /* 54 * Sanity checks: func and stack may not be NULL. 55 */ 56 testq %rdi,%rdi 57 je 3f 58 testq %rsi,%rsi 59 je 3f 60 61 62 movq %rdi,%r12 63 movq %rcx,%r13 64 65 movq %rdx,%rdi 66 67 pushq $0 /* dummy return address */ 68 69 SYSTRAP(__clone) 70 jc 4f 71 cmpl $0,%eax 72 jne 2f /* we're the parent */ 73 movq %r13,%rdi /* restore argument */ 74 call *%r12 /* this is the clone, call the function */ 75 76 movq %rax,%rdi 77#ifdef __PIC__ 78 call PIC_PLT(_C_LABEL(_exit)) 79#else 80 call _C_LABEL(_exit) 81#endif 82 832: 84 addq $8,%rsp 85 popq %r13 86 popq %r12 87 ret 883: 89 movl $EINVAL,%eax 90 jmp 5f 914: 92 addq $8,%rsp 935: 94 popq %r13 95 popq %r12 96 jmp CERROR 97END(__clone) 98