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

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/* $NetBSD: __clone.S,v 1.6 2008/04/28 20:22:56 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Fredette.
*
* 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
.import __cerror, code
/*
* int clone(int (*fn)(void *), void *stack, int flags, void *arg);
*/
ENTRY(__clone, 0)
/*
* Sanity checks: func and stack may not be NULL.
*/
ldi EINVAL, %t1
comb,= %r0, %arg0, __cerror
nop
comb,= %r0, %arg1, __cerror
nop
/*
* Put the func and arg arguments into a frame in the child's stack.
*/
ldo (HPPA_FRAME_SIZE * 2)(%arg1), %arg1
stw %arg0, HPPA_FRAME_ARG(0)(%arg1)
stw %arg3, HPPA_FRAME_ARG(1)(%arg1)
/*
* The system call expects (flags, stack).
*/
copy %arg2, %arg0
SYSCALL(__clone)
comb,<>,n %r0, %ret1, 9f
bv,n %r0(%rp)
9: /*
* Child: Reload the function and argument from the new stack.
*/
ldw HPPA_FRAME_ARG(0)(%sp), %r22
ldw HPPA_FRAME_ARG(1)(%sp), %arg0
/* Call the clone's entry point. */
stw %r19, HPPA_FRAME_ARG(2)(%sp)
bl $$dyncall, %r31
copy %r31, %rp
ldw HPPA_FRAME_ARG(2)(%sp), %r19
/* Pass the return value to _exit(). */
copy %ret0, %arg0
PIC_CALL(_exit)
/* NOTREACHED */
EXIT(__clone)