1/* $NetBSD: __clone.S,v 1.3 2001/07/18 12:24:53 fvdl Exp $ */ 2 3/* 4 * Copyright (c) 2001 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 pushl %ebp 52 53 /* 54 * Sanity checks: func and stack may not be NULL. 55 */ 56 movl 8(%esp), %ebp 57 cmpl $0,%ebp /* function */ 58 je 3f 59 movl 12(%esp),%eax /* stack */ 60 cmpl $0,%eax 61 je 3f 62 63 /* 64 * Set up the stack for the clone. 65 */ 66 movl 20(%esp),%ecx 67 movl %ecx,-4(%eax) /* argument */ 68 leal -4(%eax),%eax /* sp points to arg */ 69 70 pushl %eax /* stack */ 71 pushl 20(%esp) /* flags */ 72 pushl $0 /* dummy return address */ 73 74 SYSTRAP(__clone) 75 jc 4f 76 cmpl $0,%eax 77 jne 2f /* we're the parent */ 78 call *%ebp /* this is the clone, call the function */ 79 80#ifdef PIC 81 PIC_PROLOGUE 82 pushl %eax /* clone does _exit(func(arg)); */ 83 call PIC_PLT(_C_LABEL(_exit)) 84 addl $4,%esp 85 PIC_EPILOGUE 86#else 87 pushl %eax 88 call _C_LABEL(_exit) 89 addl $4,%esp 90#endif 91 922: 93 addl $12,%esp 94 popl %ebp 95 ret 963: 97 movl $EINVAL,%eax 98 jmp 5f 994: 100 addl $12,%esp 1015: 102 popl %ebp 103#ifdef PIC 104 PIC_PROLOGUE 105 movl PIC_GOT(CERROR),%edx 106 PIC_EPILOGUE 107 jmp *%edx 108#else 109 jmp CERROR 110#endif 111