1 /* $NetBSD: userret.h,v 1.1 2006/03/12 02:04:26 christos 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 int sig; 44 struct proc *p = l->l_proc; 45 46 /* Generate UNBLOCKED upcall. */ 47 if (l->l_flag & L_SA_BLOCKING) 48 sa_unblock_userret(l); 49 50 /* Take pending signals. */ 51 while ((sig = CURSIG(l)) != 0) 52 postsig(sig); 53 l->l_priority = l->l_usrpri; 54 if (curcpu()->ci_want_resched) { 55 /* 56 * We are being preempted. 57 */ 58 preempt(0); 59 while ((sig = CURSIG(l)) != 0) 60 postsig(sig); 61 } 62 63 /* Invoke per-process kernel-exit handling, if any */ 64 if (p->p_userret) 65 (p->p_userret)(l, p->p_userret_arg); 66 67 /* 68 * If profiling, charge system time to the trapped pc. 69 */ 70 if (p->p_flag & P_PROFIL) { 71 extern int psratio; 72 73 addupc_task(p, frame->pc, 74 (int)(p->p_sticks - oticks) * psratio); 75 } 76 /* Invoke any pending upcalls. */ 77 if (l->l_flag & L_SA_UPCALL) 78 sa_upcall_userret(l); 79 80 curcpu()->ci_schedstate.spc_curpriority = l->l_priority; 81 } 82