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root/sys/kern/debug.c/* [<][>][^][v][top][bottom][index][help] */DEFINITIONSThis source file includes following definitions.1 /*- 2 * Copyright (c) 2005-2009, Kohsuke Ohtani 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 /* 31 * debug.c - kernel debug services 32 */ 33 34 #include <kernel.h> 35 #include <task.h> 36 #include <thread.h> 37 #include <sched.h> 38 #include <hal.h> 39 #include <sys/dbgctl.h> 40 41 typedef void (*diagfn_t)(char *); 42 typedef void (*abtfn_t)(void); 43 44 static abtfn_t db_abort = &machine_abort; /* abort handler */ 45 static diagfn_t db_puts = &diag_puts; /* function to print string */ 46 static char db_msg[DBGMSGSZ]; /* debug message string */ 47 48 static char log_buf[LOGBUFSZ]; /* log buffer */ 49 static u_long log_head; /* index for log head */ 50 static u_long log_tail; /* iundex for log tail */ 51 static u_long log_len; /* length of log */ 52 53 #define LOGINDEX(x) ((x) & (LOGBUFSZ - 1)) 54 55 /* 56 * Scaled down version of C Library printf. 57 * Only %s %u %d %c %x and zero pad flag are recognized. 58 * Printf should not be used for chit-chat. 59 */ 60 void 61 printf(const char *fmt, ...) 62 { 63 va_list args; 64 int i, s; 65 char c; 66 67 s = splhigh(); 68 va_start(args, fmt); 69 vsprintf(db_msg, fmt, args); 70 71 (*db_puts)(db_msg); 72 73 /* 74 * Record to log buffer. 75 */ 76 for (i = 0; i < DBGMSGSZ; i++) { 77 c = db_msg[i]; 78 if (c == '\0') 79 break; 80 log_buf[LOGINDEX(log_tail)] = c; 81 log_tail++; 82 if (log_len < LOGBUFSZ) 83 log_len++; 84 else 85 log_head = log_tail - LOGBUFSZ; 86 } 87 va_end(args); 88 splx(s); 89 } 90 91 /* 92 * Kernel assertion. 93 */ 94 void 95 assert(const char *file, int line, const char *exp) 96 { 97 98 printf("Assertion failed: %s line:%d '%s'\n", file, line, exp); 99 100 (*db_abort)(); 101 /* NOTREACHED */ 102 } 103 104 /* 105 * Kernel panic. 106 */ 107 void 108 panic(const char *msg) 109 { 110 111 printf("Kernel panic: %s\n", msg); 112 113 (*db_abort)(); 114 /* NOTREACHED */ 115 } 116 117 /* 118 * Copy log to the user's buffer. 119 */ 120 static int 121 getlog(char *buf) 122 { 123 u_long cnt, len, i; 124 int s, error = 0; 125 char c; 126 127 s = splhigh(); 128 i = log_head; 129 len = log_len; 130 if (len >= LOGBUFSZ) { 131 /* 132 * Overrun found. Discard broken message. 133 */ 134 while (len > 0 && log_buf[LOGINDEX(i)] != '\n') { 135 i++; 136 len--; 137 } 138 } 139 for (cnt = 0; cnt < LOGBUFSZ; cnt++) { 140 if (cnt < len) 141 c = log_buf[LOGINDEX(i)]; 142 else 143 c = '\0'; 144 if (copyout(&c, buf, 1)) { 145 error = EFAULT; 146 break; 147 } 148 i++; 149 buf++; 150 } 151 splx(s); 152 return error; 153 } 154 155 /* 156 * Debug control service. 157 */ 158 int 159 dbgctl(int cmd, void *data) 160 { 161 int error = 0; 162 size_t size; 163 task_t task; 164 struct diag_ops *dops; 165 struct abort_ops *aops; 166 167 switch (cmd) { 168 case DBGC_LOGSIZE: 169 size = LOGBUFSZ; 170 error = copyout(&size, data, sizeof(size)); 171 break; 172 173 case DBGC_GETLOG: 174 error = getlog(data); 175 break; 176 177 case DBGC_TRACE: 178 task = (task_t)data; 179 if (task_valid(task)) { 180 task->flags ^= TF_TRACE; 181 } 182 break; 183 184 case DBGC_DUMPTRAP: 185 context_dump(&curthread->ctx); 186 break; 187 188 case DBGC_SETDIAG: 189 dops = data; 190 db_puts = dops->puts; 191 break; 192 193 case DBGC_SETABORT: 194 aops = data; 195 db_abort = aops->abort; 196 break; 197 198 default: 199 error = EINVAL; 200 break; 201 } 202 return error; 203 } /* [<][>][^][v][top][bottom][index][help] */ | |||
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Copyright© 2005-2009 Kohsuke Ohtani |
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