1 /* $NetBSD: userret.h,v 1.9 2009/10/17 08:50:49 nakayama 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(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
userret(struct lwp * l,int pc,u_quad_t oticks)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 /*
67 * If profiling, charge recent system time to the trapped pc.
68 */
69 if (p->p_stflag & PST_PROFIL)
70 addupc_task(l, pc, (int)(p->p_sticks - oticks));
71 }
72
73 static __inline void share_fpu(struct lwp *, struct trapframe64 *);
74 /*
75 * If someone stole the FPU while we were away, do not enable it
76 * on return. This is not done in userret() above as it must follow
77 * the ktrsysret() in syscall(). Actually, it is likely that the
78 * ktrsysret should occur before the call to userret.
79 *
80 * Oh, and don't touch the FPU bit if we're returning to the kernel.
81 */
82 static __inline void
share_fpu(struct lwp * l,struct trapframe64 * tf)83 share_fpu(struct lwp *l, struct trapframe64 *tf)
84 {
85 if (!(tf->tf_tstate & TSTATE_PRIV) && fplwp != l)
86 tf->tf_tstate &= ~TSTATE_PEF;
87 }
88