1 /* $NetBSD: userret.h,v 1.11 2019/11/29 18:27:33 ad Exp $ */
2
3 /*
4 * Copyright (c) 1996
5 * The President and Fellows of Harvard College. All rights reserved.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This software was developed by the Computer Systems Engineering group
10 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
11 * contributed to Berkeley.
12 *
13 * All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Lawrence Berkeley Laboratory.
17 * This product includes software developed by Harvard University.
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 * 3. All advertising materials mentioning features or use of this software
28 * must display the following acknowledgement:
29 * This product includes software developed by the University of
30 * California, Berkeley and its contributors.
31 * This product includes software developed by Harvard University.
32 * 4. Neither the name of the University nor the names of its contributors
33 * may be used to endorse or promote products derived from this software
34 * without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 *
48 * @(#)trap.c 8.4 (Berkeley) 9/23/93
49 */
50
51 #include <sys/userret.h>
52
53 static __inline void userret(struct lwp *, int, u_quad_t);
54 static __inline void share_fpu(struct lwp *, struct trapframe *);
55
56
57 /*
58 * Define the code needed before returning to user mode, for
59 * trap, mem_access_fault, and syscall.
60 */
61 static __inline void
userret(struct lwp * l,int pc,u_quad_t oticks)62 userret(struct lwp *l, int pc, u_quad_t oticks)
63 {
64 struct proc *p = l->l_proc;
65
66 do {
67 cpuinfo.ci_want_ast = 0;
68 mi_userret(l);
69 } while (cpuinfo.ci_want_ast);
70
71 if (l->l_pflag & LP_OWEUPC) {
72 l->l_pflag &= ~LP_OWEUPC;
73 ADDUPROF(l);
74 }
75
76 /*
77 * If profiling, charge recent system time to the trapped pc.
78 */
79 if (p->p_stflag & PST_PROFIL)
80 addupc_task(l, pc, (int)(p->p_sticks - oticks));
81 }
82
83 /*
84 * If someone stole the FPU while we were away, do not enable it
85 * on return. This is not done in userret() above as it must follow
86 * the ktrsysret() in syscall(). Actually, it is likely that the
87 * ktrsysret should occur before the call to userret.
88 */
share_fpu(struct lwp * l,struct trapframe * tf)89 static __inline void share_fpu(struct lwp *l, struct trapframe *tf)
90 {
91 if ((tf->tf_psr & PSR_EF) != 0 && cpuinfo.fplwp != l)
92 tf->tf_psr &= ~PSR_EF;
93 }
94