1 /*- 2 * Copyright (c) 2002 Jake Burkholder 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/ktr.h> 32 #include <sys/mman.h> 33 #include <sys/stat.h> 34 35 #include <err.h> 36 #include <fcntl.h> 37 #include <kvm.h> 38 #include <limits.h> 39 #include <nlist.h> 40 #include <stdint.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #define SBUFLEN 128 47 #define USAGE \ 48 "usage: ktrdump [-c] [-f] [-t] [-e execfile] [-i ktrfile ] [-m corefile] [-o outfile]" 49 50 extern char *optarg; 51 extern int optind; 52 53 static void usage(void); 54 55 static struct nlist nl[] = { 56 { "_ktr_version" }, 57 { "_ktr_entries" }, 58 { "_ktr_idx" }, 59 { "_ktr_buf" }, 60 { NULL } 61 }; 62 63 static int cflag; 64 static int eflag; 65 static int fflag; 66 static int mflag; 67 static int tflag; 68 static int iflag; 69 70 static char corefile[PATH_MAX]; 71 static char execfile[PATH_MAX]; 72 73 static char desc[SBUFLEN]; 74 static char errbuf[_POSIX2_LINE_MAX]; 75 static char fbuf[PATH_MAX]; 76 static char obuf[PATH_MAX]; 77 static char sbuf[KTR_PARMS][SBUFLEN]; 78 79 /* 80 * Reads the ktr trace buffer from kernel memory and prints the trace entries. 81 */ 82 int 83 main(int ac, char **av) 84 { 85 u_long parms[KTR_PARMS]; 86 struct ktr_entry *buf; 87 struct stat sb; 88 kvm_t *kd; 89 FILE *out; 90 char *p; 91 int version; 92 int entries; 93 int index; 94 int parm; 95 int in; 96 int c; 97 int i; 98 int n; 99 100 /* 101 * Parse commandline arguments. 102 */ 103 out = stdout; 104 while ((c = getopt(ac, av, "cfte:i:m:o:")) != -1) 105 switch (c) { 106 case 'c': 107 cflag = 1; 108 break; 109 case 'e': 110 if (strlcpy(execfile, optarg, sizeof(execfile)) 111 >= sizeof(execfile)) 112 errx(1, "%s: File name too long", optarg); 113 eflag = 1; 114 break; 115 case 'f': 116 fflag = 1; 117 break; 118 case 'i': 119 iflag = 1; 120 if ((in = open(optarg, O_RDONLY)) == -1) 121 err(1, "%s", optarg); 122 break; 123 case 'm': 124 if (strlcpy(corefile, optarg, sizeof(corefile)) 125 >= sizeof(corefile)) 126 errx(1, "%s: File name too long", optarg); 127 mflag = 1; 128 break; 129 case 'o': 130 if ((out = fopen(optarg, "w")) == NULL) 131 err(1, "%s", optarg); 132 break; 133 case 't': 134 tflag = 1; 135 break; 136 case '?': 137 default: 138 usage(); 139 } 140 ac -= optind; 141 av += optind; 142 if (ac != 0) 143 usage(); 144 145 /* 146 * Open our execfile and corefile, resolve needed symbols and read in 147 * the trace buffer. 148 */ 149 if ((kd = kvm_openfiles(eflag ? execfile : NULL, 150 mflag ? corefile : NULL, NULL, O_RDONLY, errbuf)) == NULL) 151 errx(1, "%s", errbuf); 152 if (kvm_nlist(kd, nl) != 0 || 153 kvm_read(kd, nl[0].n_value, &version, sizeof(version)) == -1) 154 errx(1, "%s", kvm_geterr(kd)); 155 if (version != KTR_VERSION) 156 errx(1, "ktr version mismatch"); 157 if (iflag) { 158 if (fstat(in, &sb) == -1) 159 errx(1, "stat"); 160 entries = sb.st_size / sizeof(*buf); 161 index = 0; 162 buf = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, in, 0); 163 if (buf == MAP_FAILED) 164 errx(1, "mmap"); 165 } else { 166 if (kvm_read(kd, nl[1].n_value, &entries, sizeof(entries)) 167 == -1) 168 errx(1, "%s", kvm_geterr(kd)); 169 if ((buf = malloc(sizeof(*buf) * entries)) == NULL) 170 err(1, NULL); 171 if (kvm_read(kd, nl[2].n_value, &index, sizeof(index)) == -1 || 172 kvm_read(kd, nl[3].n_value, buf, sizeof(*buf) * entries) 173 == -1) 174 errx(1, "%s", kvm_geterr(kd)); 175 } 176 177 /* 178 * Print a nice header. 179 */ 180 fprintf(out, "%-6s ", "index"); 181 if (cflag) 182 fprintf(out, "%-3s ", "cpu"); 183 if (tflag) 184 fprintf(out, "%-16s ", "timestamp"); 185 if (fflag) 186 fprintf(out, "%-32s ", "file and line"); 187 fprintf(out, "%s", "trace"); 188 fprintf(out, "\n"); 189 190 fprintf(out, "------ "); 191 if (cflag) 192 fprintf(out, "--- "); 193 if (tflag) 194 fprintf(out, "---------------- "); 195 if (fflag) 196 fprintf(out, "---------------------------------------- "); 197 fprintf(out, "----- "); 198 fprintf(out, "\n"); 199 200 /* 201 * Now tear through the trace buffer. 202 */ 203 if (!iflag) 204 i = (index - 1) & (entries - 1); 205 for (;;) { 206 if (buf[i].ktr_desc == NULL) 207 break; 208 if (kvm_read(kd, (u_long)buf[i].ktr_desc, desc, 209 sizeof(desc)) == -1) 210 errx(1, "%s", kvm_geterr(kd)); 211 desc[sizeof(desc) - 1] = '\0'; 212 parm = 0; 213 for (p = desc; (c = *p++) != '\0';) { 214 if (c != '%') 215 continue; 216 if ((c = *p++) == '\0') 217 break; 218 if (parm == KTR_PARMS) 219 errx(1, "too many parameters"); 220 switch (c) { 221 case 's': 222 if (kvm_read(kd, (u_long)buf[i].ktr_parms[parm], 223 sbuf[parm], sizeof(sbuf[parm])) == -1) 224 strcpy(sbuf[parm], "(null)"); 225 sbuf[parm][sizeof(sbuf[0]) - 1] = '\0'; 226 parms[parm] = (u_long)sbuf[parm]; 227 parm++; 228 break; 229 default: 230 parms[parm] = buf[i].ktr_parms[parm]; 231 parm++; 232 break; 233 } 234 } 235 fprintf(out, "%6d ", i); 236 if (cflag) 237 fprintf(out, "%3d ", buf[i].ktr_cpu); 238 if (tflag) 239 fprintf(out, "%16ju ", 240 (uintmax_t)buf[i].ktr_timestamp); 241 if (fflag) { 242 if (kvm_read(kd, (u_long)buf[i].ktr_file, fbuf, 243 sizeof(fbuf)) == -1) 244 strcpy(fbuf, "(null)"); 245 snprintf(obuf, sizeof(obuf), "%s:%d", fbuf, 246 buf[i].ktr_line); 247 fprintf(out, "%-40s ", obuf); 248 } 249 fprintf(out, desc, parms[0], parms[1], parms[2], parms[3], 250 parms[4], parms[5]); 251 fprintf(out, "\n"); 252 if (!iflag) { 253 if (i == index) 254 break; 255 i = (i - 1) & (entries - 1); 256 } else { 257 if (++i == entries) 258 break; 259 } 260 } 261 262 return (0); 263 } 264 265 static void 266 usage(void) 267 { 268 errx(1, USAGE); 269 } 270