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/* $NetBSD: _lwp.c,v 1.7 2012/03/17 20:48:58 martin Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc.
* 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.
*
* 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/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: _lwp.c,v 1.7 2012/03/17 20:48:58 martin Exp $");
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <sys/types.h>
#include <ucontext.h>
#include <lwp.h>
#include <stdlib.h>
void
_lwp_makecontext(ucontext_t *u, void (*start)(void *),
void *arg, void *private,
caddr_t stack_base, size_t stack_size)
{
__greg_t *gr;
unsigned long *sp;
getcontext(u);
gr = u->uc_mcontext.__gregs;
u->uc_link = NULL;
u->uc_stack.ss_sp = stack_base;
u->uc_stack.ss_size = stack_size;
/*LINTED*/
sp = (ulong *)(stack_base + stack_size);
sp = (ulong *)((ulong)sp & ~0x0f);
sp -= 8 + 8 + 6;
sp[8] = (ulong)arg;
sp[14] = (ulong)sp - 2047;
sp[15] = (ulong)_lwp_exit - 8;
/*LINTED*/
sp = (ulong *)((caddr_t)sp - 2047);
gr[_REG_PC] = (ulong) start;
gr[_REG_nPC] = (ulong) start + 4;
gr[_REG_O0] = (ulong) arg;
gr[_REG_O6] = (ulong) sp;
gr[_REG_O7] = (ulong)_lwp_exit - 8;
gr[_REG_G7] = (ulong)private;
}
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