1 /* $NetBSD: userret.h,v 1.3 2005/12/24 20:07:37 perry Exp $ */ 2 3 /* 4 * Copyright (c) 1996-2002 Eduardo Horvath. All rights reserved. 5 * Copyright (c) 1996 6 * The President and Fellows of Harvard College. All rights reserved. 7 * Copyright (c) 1992, 1993 8 * The Regents of the University of California. All rights reserved. 9 * 10 * This software was developed by the Computer Systems Engineering group 11 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 12 * contributed to Berkeley. 13 * 14 * All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Lawrence Berkeley Laboratory. 18 * This product includes software developed by Harvard University. 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 1. Redistributions of source code must retain the above copyright 24 * notice, this list of conditions and the following disclaimer. 25 * 2. Redistributions in binary form must reproduce the above copyright 26 * notice, this list of conditions and the following disclaimer in the 27 * documentation and/or other materials provided with the distribution. 28 * 3. All advertising materials mentioning features or use of this software 29 * must display the following acknowledgement: 30 * This product includes software developed by the University of 31 * California, Berkeley and its contributors. 32 * This product includes software developed by Harvard University. 33 * 4. Neither the name of the University nor the names of its contributors 34 * may be used to endorse or promote products derived from this software 35 * without specific prior written permission. 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 38 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 40 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 41 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 42 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 * 49 * @(#)trap.c 8.4 (Berkeley) 9/23/93 50 */ 51 52 #include <sys/userret.h> 53 54 static inline void userret __P((struct lwp *, int, u_quad_t)); 55 /* 56 * Define the code needed before returning to user mode, for 57 * trap, mem_access_fault, and syscall. 58 */ 59 static inline void 60 userret(struct lwp *l, int pc, u_quad_t oticks) 61 { 62 struct proc *p = l->l_proc; 63 64 mi_userret(l); 65 66 if (want_ast) { 67 want_ast = 0; 68 if (p->p_flag & P_OWEUPC) { 69 p->p_flag &= ~P_OWEUPC; 70 ADDUPROF(p); 71 } 72 } 73 74 /* 75 * If profiling, charge recent system time to the trapped pc. 76 */ 77 if (p->p_flag & P_PROFIL) 78 addupc_task(p, pc, (int)(p->p_sticks - oticks)); 79 80 curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 81 } 82 83 static inline void share_fpu __P((struct lwp *, struct trapframe64 *)); 84 /* 85 * If someone stole the FPU while we were away, do not enable it 86 * on return. This is not done in userret() above as it must follow 87 * the ktrsysret() in syscall(). Actually, it is likely that the 88 * ktrsysret should occur before the call to userret. 89 * 90 * Oh, and don't touch the FPU bit if we're returning to the kernel. 91 */ 92 static inline void 93 share_fpu(struct lwp *l, struct trapframe64 *tf) 94 { 95 if (!(tf->tf_tstate & (PSTATE_PRIV << TSTATE_PSTATE_SHIFT)) && 96 fplwp != l) 97 tf->tf_tstate &= ~(PSTATE_PEF << TSTATE_PSTATE_SHIFT); 98 } 99