1 /* $NetBSD: userret.h,v 1.9 2007/11/05 20:37:48 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 #include <sys/userret.h> 34 35 /* 36 * Common code used by various execption handlers to 37 * return to usermode. 38 */ 39 static __inline void 40 userret(struct lwp *l, struct trapframe *frame, u_quad_t oticks) 41 { 42 struct proc *p = l->l_proc; 43 44 LOCKDEBUG_BARRIER(NULL, 0); 45 46 /* Take pending signals. */ 47 for (;;) { 48 if ((l->l_flag & LW_USERRET) != 0) 49 lwp_userret(l); 50 if (!curcpu()->ci_want_resched) 51 break; 52 preempt(); 53 } 54 55 /* 56 * If profiling, charge system time to the trapped pc. 57 */ 58 if ((p->p_stflag & PST_PROFIL) != 0) { 59 extern int psratio; 60 61 addupc_task(l, frame->pc, 62 (int)(p->p_sticks - oticks) * psratio); 63 } 64 } 65