usr.sbin/kgmon/kgmon.c

   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 1.7 2008/04/20 13:44:26 swildner 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         { NULL },
  60 };
  61
  62 struct kvmvars {
  63         kvm_t   *kd;
  64         struct gmonparam gpm;
  65 };
  66
  67 int     Bflag, bflag, hflag, kflag, rflag, pflag;
  68 int     debug = 0;
  69 int     getprof(struct kvmvars *);
  70 void    kern_readonly(int);
  71 int     openfiles(char *, char *, struct kvmvars *);
  72 void    setprof(struct kvmvars *kvp, int state);
  73 void    dumpstate(struct kvmvars *kvp);
  74 void    reset(struct kvmvars *kvp);
  75 static void usage(void);
  76
  77 int
  78 main(int argc, char **argv)
  79 {
  80         int ch, mode, disp, accessmode;
  81         struct kvmvars kvmvars;
  82         char *system, *kmemf;
  83
  84         seteuid(getuid());
  85         kmemf = NULL;
  86         system = NULL;
  87         while ((ch = getopt(argc, argv, "M:N:Bbhpr")) != -1) {
  88                 switch((char)ch) {
  89
  90                 case 'M':
  91                         kmemf = optarg;
  92                         kflag = 1;
  93                         break;
  94
  95                 case 'N':
  96                         system = optarg;
  97                         break;
  98
  99                 case 'B':
 100                         Bflag = 1;
 101                         break;
 102
 103                 case 'b':
 104                         bflag = 1;
 105                         break;
 106
 107                 case 'h':
 108                         hflag = 1;
 109                         break;
 110
 111                 case 'p':
 112                         pflag = 1;
 113                         break;
 114
 115                 case 'r':
 116                         rflag = 1;
 117                         break;
 118
 119                 default:
 120                         usage();
 121                 }
 122         }
 123         argc -= optind;
 124         argv += optind;
 125
 126 #define BACKWARD_COMPATIBILITY
 127 #ifdef  BACKWARD_COMPATIBILITY
 128         if (*argv) {
 129                 system = *argv;
 130                 if (*++argv) {
 131                         kmemf = *argv;
 132                         ++kflag;
 133                 }
 134         }
 135 #endif
 136         if (system == NULL)
 137                 system = (char *)getbootfile();
 138         accessmode = openfiles(system, kmemf, &kvmvars);
 139         mode = getprof(&kvmvars);
 140         if (hflag)
 141                 disp = GMON_PROF_OFF;
 142         else if (Bflag)
 143                 disp = GMON_PROF_HIRES;
 144         else if (bflag)
 145                 disp = GMON_PROF_ON;
 146         else
 147                 disp = mode;
 148         if (pflag)
 149                 dumpstate(&kvmvars);
 150         if (rflag)
 151                 reset(&kvmvars);
 152         if (accessmode == O_RDWR)
 153                 setprof(&kvmvars, disp);
 154         fprintf(stdout, "kgmon: kernel profiling is %s.\n",
 155                       disp == GMON_PROF_OFF ? "off" :
 156                       disp == GMON_PROF_HIRES ? "running (high resolution)" :
 157                       disp == GMON_PROF_ON ? "running" :
 158                       disp == GMON_PROF_BUSY ? "busy" :
 159                       disp == GMON_PROF_ERROR ? "off (error)" :
 160                       "in an unknown state");
 161         return (0);
 162 }
 163
 164 static void
 165 usage(void)
 166 {
 167         fprintf(stderr, "usage: kgmon [-Bbhrp] [-M core] [-N system]\n");
 168         exit(1);
 169 }
 170
 171 /*
 172  * Check that profiling is enabled and open any ncessary files.
 173  */
 174 int
 175 openfiles(char *system, char *kmemf, struct kvmvars *kvp)
 176 {
 177         int mib[3], state, size, openmode;
 178         char errbuf[_POSIX2_LINE_MAX];
 179
 180         if (!kflag) {
 181                 mib[0] = CTL_KERN;
 182                 mib[1] = KERN_PROF;
 183                 mib[2] = GPROF_STATE;
 184                 size = sizeof state;
 185                 if (sysctl(mib, 3, &state, &size, NULL, 0) < 0)
 186                         errx(20, "profiling not defined in kernel");
 187                 if (!(Bflag || bflag || hflag || rflag ||
 188                     (pflag &&
 189                      (state == GMON_PROF_HIRES || state == GMON_PROF_ON))))
 190                         return (O_RDONLY);
 191                 seteuid(0);
 192                 if (sysctl(mib, 3, NULL, NULL, &state, size) >= 0)
 193                         return (O_RDWR);
 194                 seteuid(getuid());
 195                 kern_readonly(state);
 196                 return (O_RDONLY);
 197         }
 198         openmode = (Bflag || bflag || hflag || pflag || rflag)
 199                    ? O_RDWR : O_RDONLY;
 200         kvp->kd = kvm_openfiles(system, kmemf, NULL, openmode, errbuf);
 201         if (kvp->kd == NULL) {
 202                 if (openmode == O_RDWR) {
 203                         openmode = O_RDONLY;
 204                         kvp->kd = kvm_openfiles(system, kmemf, NULL, O_RDONLY,
 205                             errbuf);
 206                 }
 207                 if (kvp->kd == NULL)
 208                         errx(2, "kvm_openfiles: %s", errbuf);
 209                 kern_readonly(GMON_PROF_ON);
 210         }
 211         if (kvm_nlist(kvp->kd, nl) < 0)
 212                 errx(3, "%s: no namelist", system);
 213         if (!nl[N_GMONPARAM].n_value)
 214                 errx(20, "profiling not defined in kernel");
 215         return (openmode);
 216 }
 217
 218 /*
 219  * Suppress options that require a writable kernel.
 220  */
 221 void
 222 kern_readonly(int mode)
 223 {
 224         fprintf(stderr, "kgmon: kernel read-only: ");
 225         if (pflag && (mode == GMON_PROF_HIRES || mode == GMON_PROF_ON))
 226                 fprintf(stderr, "data may be inconsistent\n");
 227         if (rflag)
 228                 fprintf(stderr, "-r suppressed\n");
 229         if (Bflag)
 230                 fprintf(stderr, "-B suppressed\n");
 231         if (bflag)
 232                 fprintf(stderr, "-b suppressed\n");
 233         if (hflag)
 234                 fprintf(stderr, "-h suppressed\n");
 235         rflag = Bflag = bflag = hflag = 0;
 236 }
 237
 238 /*
 239  * Get the state of kernel profiling.
 240  */
 241 int
 242 getprof(struct kvmvars *kvp)
 243 {
 244         int mib[3], size;
 245
 246         if (kflag) {
 247                 size = kvm_read(kvp->kd, nl[N_GMONPARAM].n_value, &kvp->gpm,
 248                     sizeof kvp->gpm);
 249         } else {
 250                 mib[0] = CTL_KERN;
 251                 mib[1] = KERN_PROF;
 252                 mib[2] = GPROF_GMONPARAM;
 253                 size = sizeof kvp->gpm;
 254                 if (sysctl(mib, 3, &kvp->gpm, &size, NULL, 0) < 0)
 255                         size = 0;
 256         }
 257         if (size != sizeof kvp->gpm)
 258                 errx(4, "cannot get gmonparam: %s",
 259                     kflag ? kvm_geterr(kvp->kd) : strerror(errno));
 260         return (kvp->gpm.state);
 261 }
 262
 263 /*
 264  * Enable or disable kernel profiling according to the state variable.
 265  */
 266 void
 267 setprof(struct kvmvars *kvp, int state)
 268 {
 269         struct gmonparam *p = (struct gmonparam *)nl[N_GMONPARAM].n_value;
 270         int mib[3], sz, oldstate;
 271
 272         sz = sizeof(state);
 273         if (!kflag) {
 274                 mib[0] = CTL_KERN;
 275                 mib[1] = KERN_PROF;
 276                 mib[2] = GPROF_STATE;
 277                 if (sysctl(mib, 3, &oldstate, &sz, NULL, 0) < 0)
 278                         goto bad;
 279                 if (oldstate == state)
 280                         return;
 281                 seteuid(0);
 282                 if (sysctl(mib, 3, NULL, NULL, &state, sz) >= 0) {
 283                         seteuid(getuid());
 284                         return;
 285                 }
 286                 seteuid(getuid());
 287         } else if (kvm_write(kvp->kd, (u_long)&p->state, (void *)&state, sz)
 288             == sz)
 289                 return;
 290 bad:
 291         warnx("warning: cannot turn profiling %s",
 292             state == GMON_PROF_OFF ? "off" : "on");
 293 }
 294
 295 /*
 296  * Build the gmon.out file.
 297  */
 298 void
 299 dumpstate(struct kvmvars *kvp)
 300 {
 301         FILE *fp;
 302         struct rawarc rawarc;
 303         struct tostruct *tos;
 304         u_long frompc;
 305         u_short *froms, *tickbuf;
 306         int mib[3], i;
 307         struct gmonhdr h;
 308         int fromindex, endfrom, toindex;
 309
 310         setprof(kvp, GMON_PROF_OFF);
 311         fp = fopen("gmon.out", "w");
 312         if (fp == 0) {
 313                 warn("gmon.out");
 314                 return;
 315         }
 316
 317         /*
 318          * Build the gmon header and write it to a file.
 319          */
 320         bzero(&h, sizeof(h));
 321         h.lpc = kvp->gpm.lowpc;
 322         h.hpc = kvp->gpm.highpc;
 323         h.ncnt = kvp->gpm.kcountsize + sizeof(h);
 324         h.version = GMONVERSION;
 325         h.profrate = kvp->gpm.profrate;
 326         fwrite((char *)&h, sizeof(h), 1, fp);
 327
 328         /*
 329          * Write out the tick buffer.
 330          */
 331         mib[0] = CTL_KERN;
 332         mib[1] = KERN_PROF;
 333         if ((tickbuf = (u_short *)malloc(kvp->gpm.kcountsize)) == NULL)
 334                 errx(5, "cannot allocate kcount space");
 335         if (kflag) {
 336                 i = kvm_read(kvp->kd, (u_long)kvp->gpm.kcount, (void *)tickbuf,
 337                     kvp->gpm.kcountsize);
 338         } else {
 339                 mib[2] = GPROF_COUNT;
 340                 i = kvp->gpm.kcountsize;
 341                 if (sysctl(mib, 3, tickbuf, &i, NULL, 0) < 0)
 342                         i = 0;
 343         }
 344         if (i != kvp->gpm.kcountsize)
 345                 errx(6, "read ticks: read %u, got %d: %s",
 346                     kvp->gpm.kcountsize, i,
 347                     kflag ? kvm_geterr(kvp->kd) : strerror(errno));
 348         if ((fwrite(tickbuf, kvp->gpm.kcountsize, 1, fp)) != 1)
 349                 err(7, "writing tocks to gmon.out");
 350         free(tickbuf);
 351
 352         /*
 353          * Write out the arc info.
 354          */
 355         if ((froms = (u_short *)malloc(kvp->gpm.fromssize)) == NULL)
 356                 errx(8, "cannot allocate froms space");
 357         if (kflag) {
 358                 i = kvm_read(kvp->kd, (u_long)kvp->gpm.froms, (void *)froms,
 359                     kvp->gpm.fromssize);
 360         } else {
 361                 mib[2] = GPROF_FROMS;
 362                 i = kvp->gpm.fromssize;
 363                 if (sysctl(mib, 3, froms, &i, NULL, 0) < 0)
 364                         i = 0;
 365         }
 366         if (i != kvp->gpm.fromssize)
 367                 errx(9, "read froms: read %u, got %d: %s",
 368                     kvp->gpm.fromssize, i,
 369                     kflag ? kvm_geterr(kvp->kd) : strerror(errno));
 370         if ((tos = (struct tostruct *)malloc(kvp->gpm.tossize)) == NULL)
 371                 errx(10, "cannot allocate tos space");
 372         if (kflag) {
 373                 i = kvm_read(kvp->kd, (u_long)kvp->gpm.tos, (void *)tos,
 374                     kvp->gpm.tossize);
 375         } else {
 376                 mib[2] = GPROF_TOS;
 377                 i = kvp->gpm.tossize;
 378                 if (sysctl(mib, 3, tos, &i, NULL, 0) < 0)
 379                         i = 0;
 380         }
 381         if (i != kvp->gpm.tossize)
 382                 errx(11, "read tos: read %u, got %d: %s",
 383                     kvp->gpm.tossize, i,
 384                     kflag ? kvm_geterr(kvp->kd) : strerror(errno));
 385         if (debug)
 386                 warnx("lowpc 0x%x, textsize 0x%x",
 387                               kvp->gpm.lowpc, kvp->gpm.textsize);
 388         endfrom = kvp->gpm.fromssize / sizeof(*froms);
 389         for (fromindex = 0; fromindex < endfrom; ++fromindex) {
 390                 if (froms[fromindex] == 0)
 391                         continue;
 392                 frompc = (u_long)kvp->gpm.lowpc +
 393                     (fromindex * kvp->gpm.hashfraction * sizeof(*froms));
 394                 for (toindex = froms[fromindex]; toindex != 0;
 395                    toindex = tos[toindex].link) {
 396                         if (debug)
 397                             warnx("[mcleanup] frompc 0x%x selfpc 0x%x count %d",
 398                             frompc, tos[toindex].selfpc,
 399                             tos[toindex].count);
 400                         rawarc.raw_frompc = frompc;
 401                         rawarc.raw_selfpc = (u_long)tos[toindex].selfpc;
 402                         rawarc.raw_count = tos[toindex].count;
 403                         fwrite((char *)&rawarc, sizeof(rawarc), 1, fp);
 404                 }
 405         }
 406         fclose(fp);
 407 }
 408
 409 /*
 410  * Reset the kernel profiling date structures.
 411  */
 412 void
 413 reset(struct kvmvars *kvp)
 414 {
 415         char *zbuf;
 416         u_long biggest;
 417         int mib[3];
 418
 419         setprof(kvp, GMON_PROF_OFF);
 420
 421         biggest = kvp->gpm.kcountsize;
 422         if (kvp->gpm.fromssize > biggest)
 423                 biggest = kvp->gpm.fromssize;
 424         if (kvp->gpm.tossize > biggest)
 425                 biggest = kvp->gpm.tossize;
 426         if ((zbuf = (char *)malloc(biggest)) == NULL)
 427                 errx(12, "cannot allocate zbuf space");
 428         bzero(zbuf, biggest);
 429         if (kflag) {
 430                 if (kvm_write(kvp->kd, (u_long)kvp->gpm.kcount, zbuf,
 431                     kvp->gpm.kcountsize) != kvp->gpm.kcountsize)
 432                         errx(13, "tickbuf zero: %s", kvm_geterr(kvp->kd));
 433                 if (kvm_write(kvp->kd, (u_long)kvp->gpm.froms, zbuf,
 434                     kvp->gpm.fromssize) != kvp->gpm.fromssize)
 435                         errx(14, "froms zero: %s", kvm_geterr(kvp->kd));
 436                 if (kvm_write(kvp->kd, (u_long)kvp->gpm.tos, zbuf,
 437                     kvp->gpm.tossize) != kvp->gpm.tossize)
 438                         errx(15, "tos zero: %s", kvm_geterr(kvp->kd));
 439                 return;
 440         }
 441         seteuid(0);
 442         mib[0] = CTL_KERN;
 443         mib[1] = KERN_PROF;
 444         mib[2] = GPROF_COUNT;
 445         if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.kcountsize) < 0)
 446                 err(13, "tickbuf zero");
 447         mib[2] = GPROF_FROMS;
 448         if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.fromssize) < 0)
 449                 err(14, "froms zero");
 450         mib[2] = GPROF_TOS;
 451         if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.tossize) < 0)
 452                 err(15, "tos zero");
 453         seteuid(getuid());
 454         free(zbuf);
 455 }