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userret.h revision 1.13.6.1 
      1 /*	$NetBSD: userret.h,v 1.13.6.1 2012/06/02 11:09:10 mrg 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 #include <sys/userret.h>
     34 #include <sys/ras.h>
     35 
     36 /*
     37  *	Common code used by various exception handlers to
     38  *	return to usermode.
     39  */
     40 static __inline void
     41 userret(struct lwp *l, struct trapframe *tf, u_quad_t oticks)
     42 {
     43 	struct proc * const p = l->l_proc;
     44 
     45 	mi_userret(l);
     46 
     47 	/*
     48 	 * Check to see if a RAS was interrupted and restart it if it was.
     49 	 */
     50 	if (__predict_false(p->p_raslist != NULL)) {
     51 		void * const ras_pc = ras_lookup(p, (void *) tf->tf_pc);
     52 		if (ras_pc != (void *) -1)
     53 			tf->tf_pc = (vaddr_t) ras_pc;
     54 	}
     55 
     56 	/*
     57 	 * If profiling, charge system time to the trapped pc.
     58 	 */
     59 	if ((p->p_stflag & PST_PROFIL) != 0) {
     60 		extern int psratio;
     61 
     62 		addupc_task(l, tf->tf_pc,
     63 		    (int)(p->p_sticks - oticks) * psratio);
     64 	}
     65 }
     66