minix/lib/nbsd_libc/arch/alpha/sys/__clone.S
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.
2011-02-14 19:36:03 +00:00

91 lines
2.5 KiB
ArmAsm

/* $NetBSD: __clone.S,v 1.3 2008/04/28 20:22:55 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);
*/
LEAF(__clone, 4)
br pv, 1f
1: LDGP(pv)
/*
* Sanity checks: func and stack may not be NULL.
*/
beq a0, 9f
beq a1, 9f
/*
* We need to be able to get at the func and arg arguments
* in the child. Luckily, we have a convenient place to
* do this; the child's stack.
*/
subq a1, 16, a1
stq a0, 0(a1)
stq a3, 8(a1)
/*
* The system call expects (flags, stack).
*/
mov a2, a0
CALLSYS_ERROR(__clone)
beq a4, 8f /* a4 (rv[1]) == 0, parent, child pid in v0 */
/*
* Fetch the function and argument from the new stack, and
* pop it back.
*/
ldq pv, 0(sp)
ldq a0, 8(sp)
addq sp, 16, sp
/* Call the clone's entry point. */
CALL((pv))
/* Pass return value to _exit(). */
mov v0, a0
CALL(_exit)
/* NOTREACHED */
8: RET
9: ldiq v0, EINVAL
jmp zero, __cerror
END(__clone)