| 1 | /* |
| 2 | * Copyright (c) 1983, 1992, 1993 |
| 3 | * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * @(#) Copyright (c) 1983, 1992, 1993 The Regents of the University of California. All rights reserved. |
| 34 | * @(#)kgmon.c 8.1 (Berkeley) 6/6/93 |
| 35 | * $FreeBSD: src/usr.sbin/kgmon/kgmon.c,v 1.9 1999/08/28 01:16:42 peter Exp $ |
| 36 | * $DragonFly: src/usr.sbin/kgmon/kgmon.c,v 1.3 2003/11/03 19:31:38 eirikn Exp $ |
| 37 | */ |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/file.h> |
| 41 | #include <sys/time.h> |
| 42 | #include <sys/sysctl.h> |
| 43 | #include <sys/gmon.h> |
| 44 | #include <ctype.h> |
| 45 | #include <err.h> |
| 46 | #include <errno.h> |
| 47 | #include <kvm.h> |
| 48 | #include <limits.h> |
| 49 | #include <nlist.h> |
| 50 | #include <paths.h> |
| 51 | #include <stdio.h> |
| 52 | #include <stdlib.h> |
| 53 | #include <string.h> |
| 54 | #include <unistd.h> |
| 55 | |
| 56 | struct nlist nl[] = { |
| 57 | #define N_GMONPARAM 0 |
| 58 | { "__gmonparam" }, |
| 59 | #define N_PROFHZ 1 |
| 60 | { "_profhz" }, |
| 61 | { NULL }, |
| 62 | }; |
| 63 | |
| 64 | struct kvmvars { |
| 65 | kvm_t *kd; |
| 66 | struct gmonparam gpm; |
| 67 | }; |
| 68 | |
| 69 | int Bflag, bflag, hflag, kflag, rflag, pflag; |
| 70 | int debug = 0; |
| 71 | int getprof(struct kvmvars *); |
| 72 | int getprofhz(struct kvmvars *); |
| 73 | void kern_readonly(int); |
| 74 | int openfiles(char *, char *, struct kvmvars *); |
| 75 | void setprof(struct kvmvars *kvp, int state); |
| 76 | void dumpstate(struct kvmvars *kvp); |
| 77 | void reset(struct kvmvars *kvp); |
| 78 | static void usage(void); |
| 79 | |
| 80 | int |
| 81 | main(int argc, char **argv) |
| 82 | { |
| 83 | int ch, mode, disp, accessmode; |
| 84 | struct kvmvars kvmvars; |
| 85 | char *system, *kmemf; |
| 86 | |
| 87 | seteuid(getuid()); |
| 88 | kmemf = NULL; |
| 89 | system = NULL; |
| 90 | while ((ch = getopt(argc, argv, "M:N:Bbhpr")) != -1) { |
| 91 | switch((char)ch) { |
| 92 | |
| 93 | case 'M': |
| 94 | kmemf = optarg; |
| 95 | kflag = 1; |
| 96 | break; |
| 97 | |
| 98 | case 'N': |
| 99 | system = optarg; |
| 100 | break; |
| 101 | |
| 102 | case 'B': |
| 103 | Bflag = 1; |
| 104 | break; |
| 105 | |
| 106 | case 'b': |
| 107 | bflag = 1; |
| 108 | break; |
| 109 | |
| 110 | case 'h': |
| 111 | hflag = 1; |
| 112 | break; |
| 113 | |
| 114 | case 'p': |
| 115 | pflag = 1; |
| 116 | break; |
| 117 | |
| 118 | case 'r': |
| 119 | rflag = 1; |
| 120 | break; |
| 121 | |
| 122 | default: |
| 123 | usage(); |
| 124 | } |
| 125 | } |
| 126 | argc -= optind; |
| 127 | argv += optind; |
| 128 | |
| 129 | #define BACKWARD_COMPATIBILITY |
| 130 | #ifdef BACKWARD_COMPATIBILITY |
| 131 | if (*argv) { |
| 132 | system = *argv; |
| 133 | if (*++argv) { |
| 134 | kmemf = *argv; |
| 135 | ++kflag; |
| 136 | } |
| 137 | } |
| 138 | #endif |
| 139 | if (system == NULL) |
| 140 | system = (char *)getbootfile(); |
| 141 | accessmode = openfiles(system, kmemf, &kvmvars); |
| 142 | mode = getprof(&kvmvars); |
| 143 | if (hflag) |
| 144 | disp = GMON_PROF_OFF; |
| 145 | else if (Bflag) |
| 146 | disp = GMON_PROF_HIRES; |
| 147 | else if (bflag) |
| 148 | disp = GMON_PROF_ON; |
| 149 | else |
| 150 | disp = mode; |
| 151 | if (pflag) |
| 152 | dumpstate(&kvmvars); |
| 153 | if (rflag) |
| 154 | reset(&kvmvars); |
| 155 | if (accessmode == O_RDWR) |
| 156 | setprof(&kvmvars, disp); |
| 157 | (void)fprintf(stdout, "kgmon: kernel profiling is %s.\n", |
| 158 | disp == GMON_PROF_OFF ? "off" : |
| 159 | disp == GMON_PROF_HIRES ? "running (high resolution)" : |
| 160 | disp == GMON_PROF_ON ? "running" : |
| 161 | disp == GMON_PROF_BUSY ? "busy" : |
| 162 | disp == GMON_PROF_ERROR ? "off (error)" : |
| 163 | "in an unknown state"); |
| 164 | return (0); |
| 165 | } |
| 166 | |
| 167 | static void |
| 168 | usage() |
| 169 | { |
| 170 | fprintf(stderr, "usage: kgmon [-Bbhrp] [-M core] [-N system]\n"); |
| 171 | exit(1); |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Check that profiling is enabled and open any ncessary files. |
| 176 | */ |
| 177 | int |
| 178 | openfiles(system, kmemf, kvp) |
| 179 | char *system; |
| 180 | char *kmemf; |
| 181 | struct kvmvars *kvp; |
| 182 | { |
| 183 | int mib[3], state, size, openmode; |
| 184 | char errbuf[_POSIX2_LINE_MAX]; |
| 185 | |
| 186 | if (!kflag) { |
| 187 | mib[0] = CTL_KERN; |
| 188 | mib[1] = KERN_PROF; |
| 189 | mib[2] = GPROF_STATE; |
| 190 | size = sizeof state; |
| 191 | if (sysctl(mib, 3, &state, &size, NULL, 0) < 0) |
| 192 | errx(20, "profiling not defined in kernel"); |
| 193 | if (!(Bflag || bflag || hflag || rflag || |
| 194 | (pflag && |
| 195 | (state == GMON_PROF_HIRES || state == GMON_PROF_ON)))) |
| 196 | return (O_RDONLY); |
| 197 | (void)seteuid(0); |
| 198 | if (sysctl(mib, 3, NULL, NULL, &state, size) >= 0) |
| 199 | return (O_RDWR); |
| 200 | (void)seteuid(getuid()); |
| 201 | kern_readonly(state); |
| 202 | return (O_RDONLY); |
| 203 | } |
| 204 | openmode = (Bflag || bflag || hflag || pflag || rflag) |
| 205 | ? O_RDWR : O_RDONLY; |
| 206 | kvp->kd = kvm_openfiles(system, kmemf, NULL, openmode, errbuf); |
| 207 | if (kvp->kd == NULL) { |
| 208 | if (openmode == O_RDWR) { |
| 209 | openmode = O_RDONLY; |
| 210 | kvp->kd = kvm_openfiles(system, kmemf, NULL, O_RDONLY, |
| 211 | errbuf); |
| 212 | } |
| 213 | if (kvp->kd == NULL) |
| 214 | errx(2, "kvm_openfiles: %s", errbuf); |
| 215 | kern_readonly(GMON_PROF_ON); |
| 216 | } |
| 217 | if (kvm_nlist(kvp->kd, nl) < 0) |
| 218 | errx(3, "%s: no namelist", system); |
| 219 | if (!nl[N_GMONPARAM].n_value) |
| 220 | errx(20, "profiling not defined in kernel"); |
| 221 | return (openmode); |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Suppress options that require a writable kernel. |
| 226 | */ |
| 227 | void |
| 228 | kern_readonly(mode) |
| 229 | int mode; |
| 230 | { |
| 231 | |
| 232 | (void)fprintf(stderr, "kgmon: kernel read-only: "); |
| 233 | if (pflag && (mode == GMON_PROF_HIRES || mode == GMON_PROF_ON)) |
| 234 | (void)fprintf(stderr, "data may be inconsistent\n"); |
| 235 | if (rflag) |
| 236 | (void)fprintf(stderr, "-r supressed\n"); |
| 237 | if (Bflag) |
| 238 | (void)fprintf(stderr, "-B supressed\n"); |
| 239 | if (bflag) |
| 240 | (void)fprintf(stderr, "-b supressed\n"); |
| 241 | if (hflag) |
| 242 | (void)fprintf(stderr, "-h supressed\n"); |
| 243 | rflag = Bflag = bflag = hflag = 0; |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * Get the state of kernel profiling. |
| 248 | */ |
| 249 | int |
| 250 | getprof(kvp) |
| 251 | struct kvmvars *kvp; |
| 252 | { |
| 253 | int mib[3], size; |
| 254 | |
| 255 | if (kflag) { |
| 256 | size = kvm_read(kvp->kd, nl[N_GMONPARAM].n_value, &kvp->gpm, |
| 257 | sizeof kvp->gpm); |
| 258 | } else { |
| 259 | mib[0] = CTL_KERN; |
| 260 | mib[1] = KERN_PROF; |
| 261 | mib[2] = GPROF_GMONPARAM; |
| 262 | size = sizeof kvp->gpm; |
| 263 | if (sysctl(mib, 3, &kvp->gpm, &size, NULL, 0) < 0) |
| 264 | size = 0; |
| 265 | } |
| 266 | if (size != sizeof kvp->gpm) |
| 267 | errx(4, "cannot get gmonparam: %s", |
| 268 | kflag ? kvm_geterr(kvp->kd) : strerror(errno)); |
| 269 | return (kvp->gpm.state); |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * Enable or disable kernel profiling according to the state variable. |
| 274 | */ |
| 275 | void |
| 276 | setprof(kvp, state) |
| 277 | struct kvmvars *kvp; |
| 278 | int state; |
| 279 | { |
| 280 | struct gmonparam *p = (struct gmonparam *)nl[N_GMONPARAM].n_value; |
| 281 | int mib[3], sz, oldstate; |
| 282 | |
| 283 | sz = sizeof(state); |
| 284 | if (!kflag) { |
| 285 | mib[0] = CTL_KERN; |
| 286 | mib[1] = KERN_PROF; |
| 287 | mib[2] = GPROF_STATE; |
| 288 | if (sysctl(mib, 3, &oldstate, &sz, NULL, 0) < 0) |
| 289 | goto bad; |
| 290 | if (oldstate == state) |
| 291 | return; |
| 292 | (void)seteuid(0); |
| 293 | if (sysctl(mib, 3, NULL, NULL, &state, sz) >= 0) { |
| 294 | (void)seteuid(getuid()); |
| 295 | return; |
| 296 | } |
| 297 | (void)seteuid(getuid()); |
| 298 | } else if (kvm_write(kvp->kd, (u_long)&p->state, (void *)&state, sz) |
| 299 | == sz) |
| 300 | return; |
| 301 | bad: |
| 302 | warnx("warning: cannot turn profiling %s", |
| 303 | state == GMON_PROF_OFF ? "off" : "on"); |
| 304 | } |
| 305 | |
| 306 | /* |
| 307 | * Build the gmon.out file. |
| 308 | */ |
| 309 | void |
| 310 | dumpstate(kvp) |
| 311 | struct kvmvars *kvp; |
| 312 | { |
| 313 | register FILE *fp; |
| 314 | struct rawarc rawarc; |
| 315 | struct tostruct *tos; |
| 316 | u_long frompc; |
| 317 | u_short *froms, *tickbuf; |
| 318 | int mib[3], i; |
| 319 | struct gmonhdr h; |
| 320 | int fromindex, endfrom, toindex; |
| 321 | |
| 322 | setprof(kvp, GMON_PROF_OFF); |
| 323 | fp = fopen("gmon.out", "w"); |
| 324 | if (fp == 0) { |
| 325 | warn("gmon.out"); |
| 326 | return; |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * Build the gmon header and write it to a file. |
| 331 | */ |
| 332 | bzero(&h, sizeof(h)); |
| 333 | h.lpc = kvp->gpm.lowpc; |
| 334 | h.hpc = kvp->gpm.highpc; |
| 335 | h.ncnt = kvp->gpm.kcountsize + sizeof(h); |
| 336 | h.version = GMONVERSION; |
| 337 | h.profrate = kvp->gpm.profrate; |
| 338 | if (h.profrate == 0) |
| 339 | h.profrate = getprofhz(kvp); /* ancient kernel */ |
| 340 | fwrite((char *)&h, sizeof(h), 1, fp); |
| 341 | |
| 342 | /* |
| 343 | * Write out the tick buffer. |
| 344 | */ |
| 345 | mib[0] = CTL_KERN; |
| 346 | mib[1] = KERN_PROF; |
| 347 | if ((tickbuf = (u_short *)malloc(kvp->gpm.kcountsize)) == NULL) |
| 348 | errx(5, "cannot allocate kcount space"); |
| 349 | if (kflag) { |
| 350 | i = kvm_read(kvp->kd, (u_long)kvp->gpm.kcount, (void *)tickbuf, |
| 351 | kvp->gpm.kcountsize); |
| 352 | } else { |
| 353 | mib[2] = GPROF_COUNT; |
| 354 | i = kvp->gpm.kcountsize; |
| 355 | if (sysctl(mib, 3, tickbuf, &i, NULL, 0) < 0) |
| 356 | i = 0; |
| 357 | } |
| 358 | if (i != kvp->gpm.kcountsize) |
| 359 | errx(6, "read ticks: read %u, got %d: %s", |
| 360 | kvp->gpm.kcountsize, i, |
| 361 | kflag ? kvm_geterr(kvp->kd) : strerror(errno)); |
| 362 | if ((fwrite(tickbuf, kvp->gpm.kcountsize, 1, fp)) != 1) |
| 363 | err(7, "writing tocks to gmon.out"); |
| 364 | free(tickbuf); |
| 365 | |
| 366 | /* |
| 367 | * Write out the arc info. |
| 368 | */ |
| 369 | if ((froms = (u_short *)malloc(kvp->gpm.fromssize)) == NULL) |
| 370 | errx(8, "cannot allocate froms space"); |
| 371 | if (kflag) { |
| 372 | i = kvm_read(kvp->kd, (u_long)kvp->gpm.froms, (void *)froms, |
| 373 | kvp->gpm.fromssize); |
| 374 | } else { |
| 375 | mib[2] = GPROF_FROMS; |
| 376 | i = kvp->gpm.fromssize; |
| 377 | if (sysctl(mib, 3, froms, &i, NULL, 0) < 0) |
| 378 | i = 0; |
| 379 | } |
| 380 | if (i != kvp->gpm.fromssize) |
| 381 | errx(9, "read froms: read %u, got %d: %s", |
| 382 | kvp->gpm.fromssize, i, |
| 383 | kflag ? kvm_geterr(kvp->kd) : strerror(errno)); |
| 384 | if ((tos = (struct tostruct *)malloc(kvp->gpm.tossize)) == NULL) |
| 385 | errx(10, "cannot allocate tos space"); |
| 386 | if (kflag) { |
| 387 | i = kvm_read(kvp->kd, (u_long)kvp->gpm.tos, (void *)tos, |
| 388 | kvp->gpm.tossize); |
| 389 | } else { |
| 390 | mib[2] = GPROF_TOS; |
| 391 | i = kvp->gpm.tossize; |
| 392 | if (sysctl(mib, 3, tos, &i, NULL, 0) < 0) |
| 393 | i = 0; |
| 394 | } |
| 395 | if (i != kvp->gpm.tossize) |
| 396 | errx(11, "read tos: read %u, got %d: %s", |
| 397 | kvp->gpm.tossize, i, |
| 398 | kflag ? kvm_geterr(kvp->kd) : strerror(errno)); |
| 399 | if (debug) |
| 400 | warnx("lowpc 0x%x, textsize 0x%x", |
| 401 | kvp->gpm.lowpc, kvp->gpm.textsize); |
| 402 | endfrom = kvp->gpm.fromssize / sizeof(*froms); |
| 403 | for (fromindex = 0; fromindex < endfrom; ++fromindex) { |
| 404 | if (froms[fromindex] == 0) |
| 405 | continue; |
| 406 | frompc = (u_long)kvp->gpm.lowpc + |
| 407 | (fromindex * kvp->gpm.hashfraction * sizeof(*froms)); |
| 408 | for (toindex = froms[fromindex]; toindex != 0; |
| 409 | toindex = tos[toindex].link) { |
| 410 | if (debug) |
| 411 | warnx("[mcleanup] frompc 0x%x selfpc 0x%x count %d", |
| 412 | frompc, tos[toindex].selfpc, |
| 413 | tos[toindex].count); |
| 414 | rawarc.raw_frompc = frompc; |
| 415 | rawarc.raw_selfpc = (u_long)tos[toindex].selfpc; |
| 416 | rawarc.raw_count = tos[toindex].count; |
| 417 | fwrite((char *)&rawarc, sizeof(rawarc), 1, fp); |
| 418 | } |
| 419 | } |
| 420 | fclose(fp); |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * Get the profiling rate. |
| 425 | */ |
| 426 | int |
| 427 | getprofhz(kvp) |
| 428 | struct kvmvars *kvp; |
| 429 | { |
| 430 | int mib[2], size, profrate; |
| 431 | struct clockinfo clockrate; |
| 432 | |
| 433 | if (kflag) { |
| 434 | profrate = 1; |
| 435 | if (kvm_read(kvp->kd, nl[N_PROFHZ].n_value, &profrate, |
| 436 | sizeof profrate) != sizeof profrate) |
| 437 | warnx("get clockrate: %s", kvm_geterr(kvp->kd)); |
| 438 | return (profrate); |
| 439 | } |
| 440 | mib[0] = CTL_KERN; |
| 441 | mib[1] = KERN_CLOCKRATE; |
| 442 | clockrate.profhz = 1; |
| 443 | size = sizeof clockrate; |
| 444 | if (sysctl(mib, 2, &clockrate, &size, NULL, 0) < 0) |
| 445 | warn("get clockrate"); |
| 446 | return (clockrate.profhz); |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * Reset the kernel profiling date structures. |
| 451 | */ |
| 452 | void |
| 453 | reset(kvp) |
| 454 | struct kvmvars *kvp; |
| 455 | { |
| 456 | char *zbuf; |
| 457 | u_long biggest; |
| 458 | int mib[3]; |
| 459 | |
| 460 | setprof(kvp, GMON_PROF_OFF); |
| 461 | |
| 462 | biggest = kvp->gpm.kcountsize; |
| 463 | if (kvp->gpm.fromssize > biggest) |
| 464 | biggest = kvp->gpm.fromssize; |
| 465 | if (kvp->gpm.tossize > biggest) |
| 466 | biggest = kvp->gpm.tossize; |
| 467 | if ((zbuf = (char *)malloc(biggest)) == NULL) |
| 468 | errx(12, "cannot allocate zbuf space"); |
| 469 | bzero(zbuf, biggest); |
| 470 | if (kflag) { |
| 471 | if (kvm_write(kvp->kd, (u_long)kvp->gpm.kcount, zbuf, |
| 472 | kvp->gpm.kcountsize) != kvp->gpm.kcountsize) |
| 473 | errx(13, "tickbuf zero: %s", kvm_geterr(kvp->kd)); |
| 474 | if (kvm_write(kvp->kd, (u_long)kvp->gpm.froms, zbuf, |
| 475 | kvp->gpm.fromssize) != kvp->gpm.fromssize) |
| 476 | errx(14, "froms zero: %s", kvm_geterr(kvp->kd)); |
| 477 | if (kvm_write(kvp->kd, (u_long)kvp->gpm.tos, zbuf, |
| 478 | kvp->gpm.tossize) != kvp->gpm.tossize) |
| 479 | errx(15, "tos zero: %s", kvm_geterr(kvp->kd)); |
| 480 | return; |
| 481 | } |
| 482 | (void)seteuid(0); |
| 483 | mib[0] = CTL_KERN; |
| 484 | mib[1] = KERN_PROF; |
| 485 | mib[2] = GPROF_COUNT; |
| 486 | if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.kcountsize) < 0) |
| 487 | err(13, "tickbuf zero"); |
| 488 | mib[2] = GPROF_FROMS; |
| 489 | if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.fromssize) < 0) |
| 490 | err(14, "froms zero"); |
| 491 | mib[2] = GPROF_TOS; |
| 492 | if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.tossize) < 0) |
| 493 | err(15, "tos zero"); |
| 494 | (void)seteuid(getuid()); |
| 495 | free(zbuf); |
| 496 | } |