1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright (c) 2012 by Delphix. All rights reserved.
24 * Copyright 2017 Nexenta Systems, Inc. All rights reserved.
25 * Copyright 2017 RackTop Systems.
26 */
27
28 #include <sys/param.h>
29 #include <sys/types.h>
30 #include <sys/varargs.h>
31 #include <sys/systm.h>
32 #include <sys/cmn_err.h>
33 #include <sys/log.h>
34
35 #include <fakekernel.h>
36
37 void abort(void) __NORETURN;
38 void debug_enter(char *);
39
40 char *volatile panicstr;
41 va_list panicargs;
42 char panicbuf[512];
43
44 volatile int aok;
45
46 static const int
47 ce_flags[CE_IGNORE] = { SL_NOTE, SL_NOTE, SL_WARN, SL_FATAL };
48 static const char
49 ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
50 static const char
51 ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
52
53
54 /*
55 * This function is just a stub, exported NODIRECT so that
56 * comsumers like fksmbd can provide their own.
57 * (One that actually prints the messages.)
58 *
59 * It's used by fakekernel_cprintf() below.
60 * The flags are SL_... from strlog.h
61 */
62 /* ARGSUSED */
63 void
64 fakekernel_putlog(char *msg, size_t len, int flags)
65 {
66 }
67
68 /*
69 * fakekernel_cprintf() corresponds to os/printf.c:cprintf()
70 * This formats the message and calls fakekernel_putlog().
71 * It's exported NODIRECT to allow replacment.
72 * The flags are SL_... from strlog.h
73 */
74 void
75 fakekernel_cprintf(const char *fmt, va_list adx, int flags,
76 const char *prefix, const char *suffix)
77 {
78 size_t bufsize = LOG_MSGSIZE;
79 char buf[LOG_MSGSIZE];
80 char *bufp = buf;
81 char *msgp, *bufend;
82 size_t len;
83
84 if (strchr("^!?", fmt[0]) != NULL) {
85 if (fmt[0] == '^')
86 flags |= SL_CONSONLY;
87 else if (fmt[0] == '!')
88 flags |= SL_LOGONLY;
89 fmt++;
90 }
91
92 bufend = bufp + bufsize;
93 msgp = bufp;
94 msgp += snprintf(msgp, bufend - msgp, "[fake_kernel] ");
95 msgp += snprintf(msgp, bufend - msgp, prefix);
96 msgp += vsnprintf(msgp, bufend - msgp, fmt, adx);
97 msgp += snprintf(msgp, bufend - msgp, suffix);
98 len = msgp - bufp;
99
100 fakekernel_putlog(bufp, len, flags);
101 }
102
103 /* ARGSUSED */
104 void
105 vzprintf(zoneid_t zoneid, const char *fmt, va_list adx)
106 {
107 fakekernel_cprintf(fmt, adx, SL_CONSOLE | SL_NOTE, "", "");
108 }
109
110 /*PRINTFLIKE2*/
111 void
112 zprintf(zoneid_t zoneid, const char *fmt, ...)
113 {
114 va_list adx;
115
116 va_start(adx, fmt);
117 vzprintf(zoneid, fmt, adx);
118 va_end(adx);
119 }
120
121 /*
122 * "User-level crash dump", if you will.
123 */
124 void
125 vpanic(const char *fmt, va_list adx)
126 {
127 va_list tmpargs;
128
129 panicstr = (char *)fmt;
130 va_copy(panicargs, adx);
131
132 va_copy(tmpargs, adx);
133 fakekernel_cprintf(fmt, tmpargs, SL_FATAL, "fatal: ", "\n");
134
135 /* Call libc`assfail() so that mdb ::status works */
136 (void) vsnprintf(panicbuf, sizeof (panicbuf), fmt, adx);
137 debug_enter(panicbuf);
138 (void) assfail(panicbuf, "(panic)", 0);
139
140 abort(); /* avoid "noreturn" warnings */
141 }
142
143 void
144 panic(const char *fmt, ...)
145 {
146 va_list adx;
147
148 va_start(adx, fmt);
149 vpanic(fmt, adx);
150 va_end(adx);
151 }
152
153 void
154 fm_panic(const char *fmt, ...)
155 {
156 va_list adx;
157
158 va_start(adx, fmt);
159 vpanic(fmt, adx);
160 va_end(adx);
161 }
162
163 void
164 vcmn_err(int ce, const char *fmt, va_list adx)
165 {
166
167 if (ce == CE_PANIC)
168 vpanic(fmt, adx);
169 if (ce >= CE_IGNORE)
170 return;
171
172 fakekernel_cprintf(fmt, adx, ce_flags[ce] | SL_CONSOLE,
173 ce_prefix[ce], ce_suffix[ce]);
174 }
175
176 /*PRINTFLIKE2*/
177 void
178 cmn_err(int ce, const char *fmt, ...)
179 {
180 va_list adx;
181
182 va_start(adx, fmt);
183 vcmn_err(ce, fmt, adx);
184 va_end(adx);
185 }
186
187 /* ARGSUSED */
188 void
189 debug_enter(char *str)
190 {
191 /* Just a place for a break point. */
192 }