The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/userret.h

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    1 /* $NetBSD: userret.h,v 1.3.2.1 2004/03/30 06:03:27 jmc Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1998, 2000, 2003 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Charles M. Hannum.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*-
   40  * Copyright (c) 1990 The Regents of the University of California.
   41  * All rights reserved.
   42  *
   43  * This code is derived from software contributed to Berkeley by
   44  * William Jolitz.
   45  *
   46  * Redistribution and use in source and binary forms, with or without
   47  * modification, are permitted provided that the following conditions
   48  * are met:
   49  * 1. Redistributions of source code must retain the above copyright
   50  *    notice, this list of conditions and the following disclaimer.
   51  * 2. Redistributions in binary form must reproduce the above copyright
   52  *    notice, this list of conditions and the following disclaimer in the
   53  *    documentation and/or other materials provided with the distribution.
   54  * 3. Neither the name of the University nor the names of its contributors
   55  *    may be used to endorse or promote products derived from this software
   56  *    without specific prior written permission.
   57  *
   58  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   59  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   60  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   61  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   62  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   63  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   64  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   65  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   66  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   67  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   68  * SUCH DAMAGE.
   69  *
   70  */
   71 
   72 #ifndef _SYS_USERRET_H_
   73 #define _SYS_USERRET_H_
   74 
   75 /*
   76  * Define the MI code needed before returning to user mode, for
   77  * trap and syscall.
   78  * XXX The following ports don't use this yet:
   79  * XXX   pc532 sparc vax
   80  */
   81 static __inline void
   82 mi_userret(struct lwp *l)
   83 {
   84         struct proc *p = l->l_proc;
   85         int sig;
   86 
   87         /* Generate UNBLOCKED upcall. */
   88         if (l->l_flag & L_SA_BLOCKING)
   89                 sa_unblock_userret(l);
   90 
   91         /* Take pending signals. */
   92         while ((sig = CURSIG(l)) != 0)
   93                 postsig(sig);
   94 
   95         /* Invoke per-process kernel-exit handling, if any. */
   96         if (p->p_userret)
   97                 (p->p_userret)(l, p->p_userret_arg);
   98 
   99         /* Invoke any pending upcalls. */
  100         if (l->l_flag & L_SA_UPCALL)
  101                 sa_upcall_userret(l);
  102 }
  103 
  104 #endif  /* !_SYS_USERRET_H_ */

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