minix/lib/nbsd_libc/arch/sh3/sys/__clone.S

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/* $NetBSD: __clone.S,v 1.6 2006/01/06 03:58:31 uwe Exp $ */
/*-
* Copyright (c) 2001 Tsubai Masanari. All rights reserved.
*
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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)
/*
* Sanity checks: func and stack may not be NULL.
*/
tst r4, r4
bt inval
tst r5, r5
bt inval
mov r4, r2 /* save entry point for later */
mov r6, r4 /* r4 = flags, r5 = stack (already) */
mov.l .L_SYS___clone, r0
trapa #0x80
bf err
tst r0, r0
bf 3f /* we're the parent, just return */
jsr @r2 /* clone does _exit((*fn)(arg)); */
mov r7, r4
mov.l .L__exit, r1
#ifdef PIC
mov r0, r4
mov.l .L_got, r12 /* PIC_PROLOGUE_NOSAVE(.L_got) */
mova .L_got, r0 /* expanded to fill the delay slot */
1: JUMP r1
add r0, r12
#else
JUMP r1
mov r0, r4
#endif
/* NOTREACHED */
inval:
mov #EINVAL, r0
err:
JUMP_CERROR
/* NOTREACHED */
3: rts
nop
.align 2
.L_SYS___clone: .long SYS___clone
.L_got: PIC_GOT_DATUM
.L__exit: CALL_DATUM(_C_LABEL(_exit), 1b)
SET_ENTRY_SIZE(__clone)