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userret.h revision 1.3 
      1 /*	$NetBSD: userret.h,v 1.3 2007/02/16 02:17:42 ad Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994 Ludd, University of Lule}, Sweden.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *     This product includes software developed at Ludd, University of Lule}.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 static __inline void
     34 userret(struct lwp *, struct trapframe *, u_quad_t);
     35 
     36 /*
     37  *	Common code used by various execption handlers to
     38  *	return to usermode.
     39  */
     40 static __inline void
     41 userret(struct lwp *l, struct trapframe *frame, u_quad_t oticks)
     42 {
     43 	struct proc *p = l->l_proc;
     44 
     45 	/* Take pending signals. */
     46 	for (;;) {
     47 		if ((l->l_flag & L_USERRET) != 0)
     48 			lwp_userret(l);
     49 		if (!curcpu()->ci_want_resched)
     50 			break;
     51 		preempt();
     52 	}
     53 
     54 	/*
     55 	 * If profiling, charge system time to the trapped pc.
     56 	 */
     57 	if ((p->p_stflag & PST_PROFIL) != 0) {
     58 		extern int psratio;
     59 
     60 		addupc_task(l, frame->pc,
     61 		    (int)(p->p_sticks - oticks) * psratio);
     62 	}
     63 
     64 	curcpu()->ci_schedstate.spc_curpriority = l->l_priority;
     65 }
     66