1 /* $NetBSD: fault.c,v 1.45 2003/11/20 14:44:36 scw Exp $ */
2
3 /*-
4 * Copyright 2004 Olivier Houchard
5 * Copyright 2003 Wasabi Systems, Inc.
6 * All rights reserved.
7 *
8 * Written by Steve C. Woodford for Wasabi Systems, Inc.
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed for the NetBSD Project by
21 * Wasabi Systems, Inc.
22 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
23 * or promote products derived from this software without specific prior
24 * written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38 /*-
39 * Copyright (c) 1994-1997 Mark Brinicombe.
40 * Copyright (c) 1994 Brini.
41 * All rights reserved.
42 *
43 * This code is derived from software written for Brini by Mark Brinicombe
44 *
45 * Redistribution and use in source and binary forms, with or without
46 * modification, are permitted provided that the following conditions
47 * are met:
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 * 2. Redistributions in binary form must reproduce the above copyright
51 * notice, this list of conditions and the following disclaimer in the
52 * documentation and/or other materials provided with the distribution.
53 * 3. All advertising materials mentioning features or use of this software
54 * must display the following acknowledgement:
55 * This product includes software developed by Brini.
56 * 4. The name of the company nor the name of the author may be used to
57 * endorse or promote products derived from this software without specific
58 * prior written permission.
59 *
60 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
61 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
62 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
63 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
64 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
65 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
66 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 * SUCH DAMAGE.
71 *
72 * RiscBSD kernel project
73 *
74 * fault.c
75 *
76 * Fault handlers
77 *
78 * Created : 28/11/94
79 */
80
81 #include <sys/cdefs.h>
82 __FBSDID("$FreeBSD$");
83
84 #include <sys/param.h>
85 #include <sys/systm.h>
86 #include <sys/kernel.h>
87 #include <sys/proc.h>
88 #include <sys/lock.h>
89 #include <sys/mutex.h>
90 #include <sys/syscall.h>
91 #include <sys/sysent.h>
92 #include <sys/signalvar.h>
93 #include <sys/ptrace.h>
94
95 #include <machine/frame.h>
96
97 void swi_handler(struct trapframe *);
98
99 int
cpu_fetch_syscall_args(struct thread * td)100 cpu_fetch_syscall_args(struct thread *td)
101 {
102 struct proc *p;
103 register_t *ap;
104 struct syscall_args *sa;
105 u_int nap;
106 int error;
107
108 nap = 4;
109 sa = &td->td_sa;
110 sa->code = td->td_frame->tf_r7;
111 ap = &td->td_frame->tf_r0;
112 if (sa->code == SYS_syscall) {
113 sa->code = *ap++;
114 nap--;
115 } else if (sa->code == SYS___syscall) {
116 sa->code = ap[_QUAD_LOWWORD];
117 nap -= 2;
118 ap += 2;
119 }
120 p = td->td_proc;
121 if (sa->code >= p->p_sysent->sv_size)
122 sa->callp = &p->p_sysent->sv_table[0];
123 else
124 sa->callp = &p->p_sysent->sv_table[sa->code];
125 error = 0;
126 memcpy(sa->args, ap, nap * sizeof(register_t));
127 if (sa->callp->sy_narg > nap) {
128 error = copyin((void *)td->td_frame->tf_usr_sp, sa->args +
129 nap, (sa->callp->sy_narg - nap) * sizeof(register_t));
130 }
131 if (error == 0) {
132 td->td_retval[0] = 0;
133 td->td_retval[1] = 0;
134 }
135 return (error);
136 }
137
138 #include "../../kern/subr_syscall.c"
139
140 static void
syscall(struct thread * td,struct trapframe * frame)141 syscall(struct thread *td, struct trapframe *frame)
142 {
143
144 syscallenter(td);
145 syscallret(td);
146 }
147
148 void
swi_handler(struct trapframe * frame)149 swi_handler(struct trapframe *frame)
150 {
151 struct thread *td = curthread;
152
153 td->td_frame = frame;
154
155 td->td_pticks = 0;
156
157 /*
158 * Enable interrupts if they were enabled before the exception.
159 * Since all syscalls *should* come from user mode it will always
160 * be safe to enable them, but check anyway.
161 */
162 if (td->td_md.md_spinlock_count == 0) {
163 if (__predict_true(frame->tf_spsr & PSR_I) == 0)
164 enable_interrupts(PSR_I);
165 if (__predict_true(frame->tf_spsr & PSR_F) == 0)
166 enable_interrupts(PSR_F);
167 }
168
169 syscall(td, frame);
170 }
171