74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
|
/* $NetBSD: _lwp.c,v 1.5 2008/04/28 20:22:57 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 1.5 2008/04/28 20:22:57 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;
|
||
|
|
||
|
|
||
|
sp = (ulong *)(stack_base + stack_size);
|
||
|
sp = (ulong *)((ulong)sp & ~0x07);
|
||
|
|
||
|
/* Make room for the fake caller stack frame (CCFSZ, only in words) */
|
||
|
sp -= 8 + 8 + 1 + 6 + 1;
|
||
|
|
||
|
/* Entering (*start)(arg), return is to _lwp_exit */
|
||
|
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;
|
||
|
|
||
|
/* XXX: uwe: why do we need this? */
|
||
|
/* create loopback in the window save area on the stack? */
|
||
|
sp[8+6] = (ulong)sp; /* %i6 */
|
||
|
sp[8+7] = (ulong)_lwp_exit - 8; /* %i7 */
|
||
|
}
|