111 lines
3 KiB
ArmAsm
111 lines
3 KiB
ArmAsm
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/* $NetBSD: __clone.S,v 1.3 2001/07/18 12:24:53 fvdl Exp $ */
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/*
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* Copyright (c) 2001 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Frank van der Linden for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#include <sys/errno.h>
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#include "SYS.h"
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#ifdef WEAK_ALIAS
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WEAK_ALIAS(clone, __clone)
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#endif
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.text
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/*
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* int clone(int (*fn)(void *), void *stack, int flags, void *arg);
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*/
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ENTRY(__clone)
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pushl %ebp
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/*
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* Sanity checks: func and stack may not be NULL.
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*/
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movl 8(%esp), %ebp
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cmpl $0,%ebp /* function */
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je 3f
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movl 12(%esp),%eax /* stack */
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cmpl $0,%eax
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je 3f
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/*
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* Set up the stack for the clone.
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*/
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movl 20(%esp),%ecx
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movl %ecx,-4(%eax) /* argument */
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leal -4(%eax),%eax /* sp points to arg */
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pushl %eax /* stack */
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pushl 20(%esp) /* flags */
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pushl $0 /* dummy return address */
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SYSTRAP(__clone)
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jc 4f
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cmpl $0,%eax
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jne 2f /* we're the parent */
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call *%ebp /* this is the clone, call the function */
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#ifdef PIC
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PIC_PROLOGUE
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pushl %eax /* clone does _exit(func(arg)); */
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call PIC_PLT(_C_LABEL(_exit))
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addl $4,%esp
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PIC_EPILOGUE
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#else
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pushl %eax
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call _C_LABEL(_exit)
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addl $4,%esp
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#endif
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2:
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addl $12,%esp
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popl %ebp
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ret
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3:
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movl $EINVAL,%eax
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jmp 5f
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4:
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addl $12,%esp
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5:
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popl %ebp
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#ifdef PIC
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PIC_PROLOGUE
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movl PIC_GOT(CERROR),%edx
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PIC_EPILOGUE
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jmp *%edx
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#else
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jmp CERROR
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#endif
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