| 1 | /* $NetBSD: userret.h,v 1.26 2013/04/07 07:54:53 kiyohara Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1998, 2000, 2003, 2006, 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Charles M. Hannum, and Andrew Doran. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /*- |
| 33 | * Copyright (c) 1990 The Regents of the University of California. |
| 34 | * All rights reserved. |
| 35 | * |
| 36 | * This code is derived from software contributed to Berkeley by |
| 37 | * William Jolitz. |
| 38 | * |
| 39 | * Redistribution and use in source and binary forms, with or without |
| 40 | * modification, are permitted provided that the following conditions |
| 41 | * are met: |
| 42 | * 1. Redistributions of source code must retain the above copyright |
| 43 | * notice, this list of conditions and the following disclaimer. |
| 44 | * 2. Redistributions in binary form must reproduce the above copyright |
| 45 | * notice, this list of conditions and the following disclaimer in the |
| 46 | * documentation and/or other materials provided with the distribution. |
| 47 | * 3. Neither the name of the University nor the names of its contributors |
| 48 | * may be used to endorse or promote products derived from this software |
| 49 | * without specific prior written permission. |
| 50 | * |
| 51 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 52 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 53 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 54 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 55 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 56 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 57 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 58 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 59 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 60 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 61 | * SUCH DAMAGE. |
| 62 | * |
| 63 | */ |
| 64 | |
| 65 | #ifndef _SYS_USERRET_H_ |
| 66 | #define _SYS_USERRET_H_ |
| 67 | |
| 68 | #include <sys/lockdebug.h> |
| 69 | #include <sys/intr.h> |
| 70 | |
| 71 | /* |
| 72 | * Define the MI code needed before returning to user mode, for |
| 73 | * trap and syscall. |
| 74 | */ |
| 75 | static __inline void |
| 76 | mi_userret(struct lwp *l) |
| 77 | { |
| 78 | #ifndef __HAVE_PREEMPTION |
| 79 | struct cpu_info *ci; |
| 80 | #endif |
| 81 | |
| 82 | KASSERT(l->l_blcnt == 0); |
| 83 | #ifndef __HAVE_PREEMPTION |
| 84 | KASSERT(curcpu()->ci_biglock_count == 0); |
| 85 | #endif |
| 86 | |
| 87 | /* |
| 88 | * Handle "exceptional" events: pending signals, stop/exit actions, |
| 89 | * etc. Note that the event must be flagged BEFORE any AST is |
| 90 | * posted as we are reading unlocked. |
| 91 | */ |
| 92 | #ifdef __HAVE_PREEMPTION |
| 93 | if (__predict_false(l->l_flag & LW_USERRET)) { |
| 94 | lwp_userret(l); |
| 95 | } |
| 96 | l->l_kpriority = false; |
| 97 | /* |
| 98 | * cpu_set_curpri(prio) is a MD optimized version of: |
| 99 | * |
| 100 | * kpreempt_disable(); |
| 101 | * curcpu()->ci_schedstate.spc_curpriority = prio; |
| 102 | * kpreempt_enable(); |
| 103 | */ |
| 104 | cpu_set_curpri(l->l_priority); /* XXX this needs to die */ |
| 105 | #else |
| 106 | ci = l->l_cpu; |
| 107 | if (((l->l_flag & LW_USERRET) | ci->ci_data.cpu_softints) != 0) { |
| 108 | lwp_userret(l); |
| 109 | ci = l->l_cpu; |
| 110 | } |
| 111 | l->l_kpriority = false; |
| 112 | ci->ci_schedstate.spc_curpriority = l->l_priority; |
| 113 | #endif |
| 114 | |
| 115 | LOCKDEBUG_BARRIER(NULL, 0); |
| 116 | KASSERT(l->l_nopreempt == 0); |
| 117 | } |
| 118 | |
| 119 | #endif /* !_SYS_USERRET_H_ */ |
| 120 | |