94 lines
2.9 KiB
ArmAsm
94 lines
2.9 KiB
ArmAsm
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/* $NetBSD: __clone.S,v 1.6 2008/04/28 20:22:57 martin Exp $ */
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/*-
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* Copyright (c) 2001 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 Jason R. Thorpe.
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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/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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/*
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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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save %sp, -CCFSZ, %sp
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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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tst %i0
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be 8f ! func == NULL, bail
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orcc %i1, %g0, %o1 ! setup stack arg for syscall, test
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be 8f ! stack == NULL, bail
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mov %i2, %o0 ! setup flags arg for syscall
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/*
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* Allocate "caller's" frame in the child stack as ABI
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* requires.
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*
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* We pass the function and the argument to the child by
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* stashing them at the bottom of the frame. There they are
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* safe from window spill would we need to take one as it's
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* below the window save area.
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*/
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sub %o1, CCFSZ, %o1 ! make space on the child's stack
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st %i0, [%o1+CCFSZ-8] ! save func
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st %i3, [%o1+CCFSZ-4] ! save arg
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/*
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* Args are now set up for system call as (flags, stack).
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*/
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mov SYS___clone, %g1
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t ST_SYSCALL
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bcs 9f
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tst %o1 ! %o1 (rv[1]) == 0 in parent
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1: bz 2f ! yes, parent
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ld [%sp+CCFSZ-8], %l0 ! grab the function...
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call %l0 ! Call the clone's entry point.
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ld [%sp+CCFSZ-4], %o0 ! ...and the argument from the stack
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CALL(_C_LABEL(_exit))
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/* NOTREACHED */
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2: ret
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restore %g0, %o0, %o0
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8: restore %g0, EINVAL, %o0
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ERROR()
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/* NOTREACHED */
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9: restore %g0, %o0, %o0
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ERROR()
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/* NOTREACHED */
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