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79 lines
2.4 KiB
ArmAsm
79 lines
2.4 KiB
ArmAsm
/* $NetBSD: __clone.S,v 1.1 2014/08/10 05:47:37 matt Exp $ */
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/*-
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matt Thomas of 3am Software Foundry.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND 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 THE FOUNDATION OR CONTRIBUTORS
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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 "SYS.h"
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#include <sys/errno.h>
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WEAK_ALIAS(clone, __clone)
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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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/* test stack and function are not null */
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cbz x0, .Leinval
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cbz x1, .Leinval
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/* place the arg and func onto the child's stack */
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stp x3, x0, [x1, #-16]!
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/* syscall expects (flags, stack) */
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mov x0, x2
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SYSTRAP(__clone)
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_INVOKE_CERROR()
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/*
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* x1 and x0 are the same as from fork:
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* x1 == 0 in parent process, x1 == 1 in child process.
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* x0 == pid of child in parent, x0 == pid of parent in child.
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*/
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/* if this is the parent then just return the pid */
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cbnz x1, 1f
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/*
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* This is the child
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* load the function and arg off the stack
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*/
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ldp x0, x1, [sp], #16
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/* call the function */
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blr x1
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/* call _exit with the returned value */
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bl _C_LABEL(_exit)
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1: ret
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.Leinval:
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mov x0, #EINVAL
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b _C_LABEL(__cerror)
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END(__clone)
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