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/param.h>
82 #include <sys/systm.h>
83 #include <sys/kernel.h>
84 #include <sys/proc.h>
85 #include <sys/lock.h>
86 #include <sys/mutex.h>
87 #include <sys/syscall.h>
88 #include <sys/sysent.h>
89 #include <sys/signalvar.h>
90 #include <sys/ptrace.h>
91
92 #include <machine/frame.h>
93
94 void swi_handler(struct trapframe *);
95
96 int
cpu_fetch_syscall_args(struct thread * td)97 cpu_fetch_syscall_args(struct thread *td)
98 {
99 struct proc *p;
100 syscallarg_t *ap;
101 struct syscall_args *sa;
102 u_int nap;
103 int error;
104
105 nap = 4;
106 sa = &td->td_sa;
107 sa->code = td->td_frame->tf_r7;
108 sa->original_code = sa->code;
109 ap = &td->td_frame->tf_r0;
110 if (sa->code == SYS_syscall) {
111 sa->code = *ap++;
112 nap--;
113 } else if (sa->code == SYS___syscall) {
114 sa->code = ap[_QUAD_LOWWORD];
115 nap -= 2;
116 ap += 2;
117 }
118 p = td->td_proc;
119 if (sa->code >= p->p_sysent->sv_size)
120 sa->callp = &nosys_sysent;
121 else
122 sa->callp = &p->p_sysent->sv_table[sa->code];
123 error = 0;
124 memcpy(sa->args, ap, nap * sizeof(*sa->args));
125 if (sa->callp->sy_narg > nap) {
126 error = copyin((void *)td->td_frame->tf_usr_sp, sa->args +
127 nap, (sa->callp->sy_narg - nap) * sizeof(*sa->args));
128 }
129 if (error == 0) {
130 td->td_retval[0] = 0;
131 td->td_retval[1] = 0;
132 }
133 return (error);
134 }
135
136 #include "../../kern/subr_syscall.c"
137
138 static void
syscall(struct thread * td,struct trapframe * frame)139 syscall(struct thread *td, struct trapframe *frame)
140 {
141
142 syscallenter(td);
143 syscallret(td);
144 }
145
146 void
swi_handler(struct trapframe * frame)147 swi_handler(struct trapframe *frame)
148 {
149 struct thread *td = curthread;
150
151 td->td_frame = frame;
152
153 td->td_pticks = 0;
154
155 /*
156 * Enable interrupts if they were enabled before the exception.
157 * Since all syscalls *should* come from user mode it will always
158 * be safe to enable them, but check anyway.
159 */
160 if (td->td_md.md_spinlock_count == 0) {
161 if (__predict_true(frame->tf_spsr & PSR_I) == 0)
162 enable_interrupts(PSR_I);
163 }
164
165 syscall(td, frame);
166 }
167