minix/lib/libc/arch/sparc/sys/__clone.S

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/* $NetBSD: __clone.S,v 1.6 2008/04/28 20:22:57 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/errno.h>
#include "SYS.h"
#ifdef WEAK_ALIAS
WEAK_ALIAS(clone, __clone)
#endif
/*
* int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
*/
ENTRY(__clone)
save %sp, -CCFSZ, %sp
/*
* Sanity checks: func and stack may not be NULL.
*/
tst %i0
be 8f ! func == NULL, bail
orcc %i1, %g0, %o1 ! setup stack arg for syscall, test
be 8f ! stack == NULL, bail
mov %i2, %o0 ! setup flags arg for syscall
/*
* Allocate "caller's" frame in the child stack as ABI
* requires.
*
* We pass the function and the argument to the child by
* stashing them at the bottom of the frame. There they are
* safe from window spill would we need to take one as it's
* below the window save area.
*/
sub %o1, CCFSZ, %o1 ! make space on the child's stack
st %i0, [%o1+CCFSZ-8] ! save func
st %i3, [%o1+CCFSZ-4] ! save arg
/*
* Args are now set up for system call as (flags, stack).
*/
mov SYS___clone, %g1
t ST_SYSCALL
bcs 9f
tst %o1 ! %o1 (rv[1]) == 0 in parent
1: bz 2f ! yes, parent
ld [%sp+CCFSZ-8], %l0 ! grab the function...
call %l0 ! Call the clone's entry point.
ld [%sp+CCFSZ-4], %o0 ! ...and the argument from the stack
CALL(_C_LABEL(_exit))
/* NOTREACHED */
2: ret
restore %g0, %o0, %o0
8: restore %g0, EINVAL, %o0
ERROR()
/* NOTREACHED */
9: restore %g0, %o0, %o0
ERROR()
/* NOTREACHED */