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 */
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
39 char *volatile panicstr;
40 va_list panicargs;
41 char panicbuf[512];
42
43 volatile int aok;
44
45 static const int
46 ce_flags[CE_IGNORE] = { SL_NOTE, SL_NOTE, SL_WARN, SL_FATAL };
47 static const char
48 ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
49 static const char
50 ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
51
52
53 /*
54 * This function is just a stub, exported NODIRECT so that
55 * comsumers like fksmbd can provide their own.
56 * (One that actually prints the messages.)
57 *
58 * It's used by fakekernel_cprintf() below.
59 * The flags are SL_... from strlog.h
60 */
61 /* ARGSUSED */
62 void
63 fakekernel_putlog(char *msg, size_t len, int flags)
64 {
65 }
66
67 /*
68 * fakekernel_cprintf() corresponds to os/printf.c:cprintf()
69 * This formats the message and calls fakekernel_putlog().
70 * It's exported NODIRECT to allow replacment.
71 * The flags are SL_... from strlog.h
72 */
73 void
74 fakekernel_cprintf(const char *fmt, va_list adx, int flags,
75 const char *prefix, const char *suffix)
76 {
77 size_t bufsize = LOG_MSGSIZE;
78 char buf[LOG_MSGSIZE];
79 char *bufp = buf;
80 char *msgp, *bufend;
81 size_t len;
82
83 if (strchr("^!?", fmt[0]) != NULL) {
84 if (fmt[0] == '^')
85 flags |= SL_CONSONLY;
86 else if (fmt[0] == '!')
87 flags |= SL_LOGONLY;
88 fmt++;
89 }
90
91 bufend = bufp + bufsize;
92 msgp = bufp;
93 msgp += snprintf(msgp, bufend - msgp, "[fake_kernel] ");
94 msgp += snprintf(msgp, bufend - msgp, prefix);
95 msgp += vsnprintf(msgp, bufend - msgp, fmt, adx);
96 msgp += snprintf(msgp, bufend - msgp, suffix);
97 len = msgp - bufp;
98
99 fakekernel_putlog(bufp, len, flags);
100 }
101
102 /*
103 * "User-level crash dump", if you will.
104 */
105 void
106 vpanic(const char *fmt, va_list adx)
107 {
108 va_list tmpargs;
109
110 panicstr = (char *)fmt;
111 va_copy(panicargs, adx);
112
113 va_copy(tmpargs, adx);
114 fakekernel_cprintf(fmt, tmpargs, SL_FATAL, "fatal: ", "\n");
115
116 /* Call libc`assfail() so that mdb ::status works */
117 (void) vsnprintf(panicbuf, sizeof (panicbuf), fmt, adx);
118 assfail(panicbuf, "(panic)", 0);
119
120 abort(); /* avoid "noreturn" warnings */
121 }
122
123 void
124 panic(const char *fmt, ...)
125 {
126 va_list adx;
127
128 va_start(adx, fmt);
129 vpanic(fmt, adx);
130 va_end(adx);
131 }
132
133 void
134 fm_panic(const char *fmt, ...)
135 {
136 va_list adx;
137
138 va_start(adx, fmt);
139 vpanic(fmt, adx);
140 va_end(adx);
141 }
142
143 void
144 vcmn_err(int ce, const char *fmt, va_list adx)
145 {
146
147 if (ce == CE_PANIC)
148 vpanic(fmt, adx);
149 if (ce >= CE_IGNORE)
150 return;
151
152 fakekernel_cprintf(fmt, adx, ce_flags[ce] | SL_CONSOLE,
153 ce_prefix[ce], ce_suffix[ce]);
154 }
155
156 /*PRINTFLIKE2*/
157 void
158 cmn_err(int ce, const char *fmt, ...)
159 {
160 va_list adx;
161
162 va_start(adx, fmt);
163 vcmn_err(ce, fmt, adx);
164 va_end(adx);
165 }