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 2013 Nexenta Systems, Inc. All rights reserved.
25 * Copyright 2017 RackTop Systems.
26 * Copyright (c) 2018, Joyent, Inc.
27 */
28
29 #include <sys/param.h>
30 #include <sys/types.h>
31 #include <sys/varargs.h>
32 #include <sys/systm.h>
33 #include <sys/cmn_err.h>
34 #include <sys/log.h>
35
36 #include <fakekernel.h>
37
38 void abort(void) __NORETURN;
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 /*
104 * "User-level crash dump", if you will.
105 */
106 void
107 vpanic(const char *fmt, va_list adx)
108 {
109 va_list tmpargs;
110
111 panicstr = (char *)fmt;
112 va_copy(panicargs, adx);
113
114 va_copy(tmpargs, adx);
115 fakekernel_cprintf(fmt, tmpargs, SL_FATAL, "fatal: ", "\n");
116
117 /* Call libc`assfail() so that mdb ::status works */
118 (void) vsnprintf(panicbuf, sizeof (panicbuf), fmt, adx);
119 (void) assfail(panicbuf, "(panic)", 0);
120
121 abort(); /* avoid "noreturn" warnings */
122 }
123
124 void
125 panic(const char *fmt, ...)
126 {
127 va_list adx;
128
129 va_start(adx, fmt);
130 vpanic(fmt, adx);
131 va_end(adx);
132 }
133
134 void
135 fm_panic(const char *fmt, ...)
136 {
137 va_list adx;
138
139 va_start(adx, fmt);
140 vpanic(fmt, adx);
141 va_end(adx);
142 }
143
144 void
145 vcmn_err(int ce, const char *fmt, va_list adx)
146 {
147
148 if (ce == CE_PANIC)
149 vpanic(fmt, adx);
150 if (ce >= CE_IGNORE)
151 return;
152
153 fakekernel_cprintf(fmt, adx, ce_flags[ce] | SL_CONSOLE,
154 ce_prefix[ce], ce_suffix[ce]);
155 }
156
157 /*PRINTFLIKE2*/
158 void
159 cmn_err(int ce, const char *fmt, ...)
160 {
161 va_list adx;
162
163 va_start(adx, fmt);
164 vcmn_err(ce, fmt, adx);
165 va_end(adx);
166 }