Home | History | Annotate | Line # | Download | only in gen 
      1 /*	$NetBSD: _lwp.c,v 1.6 2012/03/22 09:32:04 he Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2002 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 #if defined(LIBC_SCCS) && !defined(lint)
     40 __RCSID("$NetBSD: _lwp.c,v 1.6 2012/03/22 09:32:04 he Exp $");
     41 #endif /* LIBC_SCCS and not lint */
     42 
     43 #include "namespace.h"
     44 #include <sys/types.h>
     45 #include <ucontext.h>
     46 #include <lwp.h>
     47 #include <stdlib.h>
     48 
     49 void
     50 _lwp_makecontext(ucontext_t *u, void (*start)(void *),
     51     void *arg, void *private, caddr_t stack_base, size_t stack_size)
     52 {
     53 	uintptr_t sp;
     54 
     55 	getcontext(u);
     56 	u->uc_link = NULL;
     57 
     58 	u->uc_stack.ss_sp = stack_base;
     59 	u->uc_stack.ss_size = stack_size;
     60 
     61 	sp = (uintptr_t)stack_base + stack_size;
     62 
     63 	u->uc_mcontext.__gregs[_REG_R4] = (__greg_t) arg;
     64 	u->uc_mcontext.__gregs[_REG_SP] = ((__greg_t) sp) & ~3;
     65 	u->uc_mcontext.__gregs[_REG_PR] = (__greg_t) _lwp_exit;
     66 	u->uc_mcontext.__gregs[_REG_PC] = (__greg_t) start;
     67 	u->uc_mcontext.__gregs[_REG_GBR] = (__greg_t) private;
     68 }
     69