FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_xxx.c
1 /* $NetBSD: kern_xxx.c,v 1.62 2006/11/01 10:17:58 yamt Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)kern_xxx.c 8.3 (Berkeley) 2/14/95
32 */
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: kern_xxx.c,v 1.62 2006/11/01 10:17:58 yamt Exp $");
36
37 #include "opt_syscall_debug.h"
38
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/proc.h>
43 #include <sys/reboot.h>
44 #include <sys/syscall.h>
45 #include <sys/sysctl.h>
46 #include <sys/mount.h>
47 #include <sys/sa.h>
48 #include <sys/syscallargs.h>
49 #include <sys/kauth.h>
50
51 /* ARGSUSED */
52 int
53 sys_reboot(struct lwp *l, void *v, register_t *retval)
54 {
55 struct sys_reboot_args /* {
56 syscallarg(int) opt;
57 syscallarg(char *) bootstr;
58 } */ *uap = v;
59 int error;
60 char *bootstr, bs[128];
61
62 if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_REBOOT,
63 0, NULL, NULL, NULL)) != 0)
64 return (error);
65
66 /*
67 * Only use the boot string if RB_STRING is set.
68 */
69 if ((SCARG(uap, opt) & RB_STRING) &&
70 (error = copyinstr(SCARG(uap, bootstr), bs, sizeof(bs), 0)) == 0)
71 bootstr = bs;
72 else
73 bootstr = NULL;
74 /*
75 * Not all ports use the bootstr currently.
76 */
77 cpu_reboot(SCARG(uap, opt), bootstr);
78 return (0);
79 }
80
81 #ifdef SYSCALL_DEBUG
82 #define SCDEBUG_CALLS 0x0001 /* show calls */
83 #define SCDEBUG_RETURNS 0x0002 /* show returns */
84 #define SCDEBUG_ALL 0x0004 /* even syscalls that are implemented */
85 #define SCDEBUG_SHOWARGS 0x0008 /* show arguments to calls */
86
87 #if 0
88 int scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS;
89 #else
90 int scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS|SCDEBUG_ALL;
91 #endif
92
93 void
94 scdebug_call(struct lwp *l, register_t code, register_t args[])
95 {
96 struct proc *p = l->l_proc;
97 const struct sysent *sy;
98 const struct emul *em;
99 int i;
100
101 if (!(scdebug & SCDEBUG_CALLS))
102 return;
103
104 em = p->p_emul;
105 sy = &em->e_sysent[code];
106 if (!(scdebug & SCDEBUG_ALL || code < 0
107 #ifndef __HAVE_MINIMAL_EMUL
108 || code >= em->e_nsysent
109 #endif
110 || sy->sy_call == sys_nosys))
111 return;
112
113 KERNEL_PROC_LOCK(l);
114 printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
115 if (code < 0
116 #ifndef __HAVE_MINIMAL_EMUL
117 || code >= em->e_nsysent
118 #endif
119 )
120 printf("OUT OF RANGE (%ld)", (long)code);
121 else {
122 printf("%ld call: %s", (long)code, em->e_syscallnames[code]);
123 if (scdebug & SCDEBUG_SHOWARGS) {
124 printf("(");
125 for (i = 0; i < sy->sy_argsize/sizeof(register_t); i++)
126 printf("%s0x%lx", i == 0 ? "" : ", ",
127 (long)args[i]);
128 printf(")");
129 }
130 }
131 printf("\n");
132 KERNEL_PROC_UNLOCK(l);
133 }
134
135 void
136 scdebug_ret(struct lwp *l, register_t code, int error, register_t retval[])
137 {
138 struct proc *p = l->l_proc;
139 const struct sysent *sy;
140 const struct emul *em;
141
142 if (!(scdebug & SCDEBUG_RETURNS))
143 return;
144
145 em = p->p_emul;
146 sy = &em->e_sysent[code];
147 if (!(scdebug & SCDEBUG_ALL || code < 0
148 #ifndef __HAVE_MINIMAL_EMUL
149 || code >= em->e_nsysent
150 #endif
151 || sy->sy_call == sys_nosys))
152 return;
153
154 KERNEL_PROC_LOCK(l);
155 printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
156 if (code < 0
157 #ifndef __HAVE_MINIMAL_EMUL
158 || code >= em->e_nsysent
159 #endif
160 )
161 printf("OUT OF RANGE (%ld)", (long)code);
162 else
163 printf("%ld ret: err = %d, rv = 0x%lx,0x%lx", (long)code,
164 error, (long)retval[0], (long)retval[1]);
165 printf("\n");
166 KERNEL_PROC_UNLOCK(l);
167 }
168 #endif /* SYSCALL_DEBUG */
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