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      1 /*	$NetBSD: userret.h,v 1.15 2017/05/22 17:12:11 ragge 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/userret.h>
     29 #include <sys/ras.h>
     30 
     31 /*
     32  *	Common code used by various exception handlers to
     33  *	return to usermode.
     34  */
     35 static __inline void
     36 userret(struct lwp *l, struct trapframe *tf, u_quad_t oticks)
     37 {
     38 	struct proc * const p = l->l_proc;
     39 
     40 	mi_userret(l);
     41 
     42 	/*
     43 	 * Check to see if a RAS was interrupted and restart it if it was.
     44 	 */
     45 	if (__predict_false(p->p_raslist != NULL)) {
     46 		void * const ras_pc = ras_lookup(p, (void *) tf->tf_pc);
     47 		if (ras_pc != (void *) -1)
     48 			tf->tf_pc = (vaddr_t) ras_pc;
     49 	}
     50 
     51 	/*
     52 	 * If profiling, charge system time to the trapped pc.
     53 	 */
     54 	if ((p->p_stflag & PST_PROFIL) != 0) {
     55 		extern int psratio;
     56 
     57 		addupc_task(l, tf->tf_pc,
     58 		    (int)(p->p_sticks - oticks) * psratio);
     59 	}
     60 }
     61