1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
|
/*
* Copyright (c) 1983, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1992, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)kgmon.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/gmon.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <kvm.h>
#include <limits.h>
#include <nlist.h>
#include <paths.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
struct nlist nl[] = {
#define N_GMONPARAM 0
{ "__gmonparam" },
#define N_PROFHZ 1
{ "_profhz" },
{ NULL },
};
struct kvmvars {
kvm_t *kd;
struct gmonparam gpm;
};
int Bflag, bflag, hflag, kflag, rflag, pflag;
int debug = 0;
int getprof(struct kvmvars *);
int getprofhz(struct kvmvars *);
void kern_readonly(int);
int openfiles(char *, char *, struct kvmvars *);
void setprof(struct kvmvars *kvp, int state);
void dumpstate(struct kvmvars *kvp);
void reset(struct kvmvars *kvp);
static void usage(void);
int
main(int argc, char **argv)
{
int ch, mode, disp, accessmode;
struct kvmvars kvmvars;
char *system, *kmemf;
seteuid(getuid());
kmemf = NULL;
system = NULL;
while ((ch = getopt(argc, argv, "M:N:Bbhpr")) != -1) {
switch((char)ch) {
case 'M':
kmemf = optarg;
kflag = 1;
break;
case 'N':
system = optarg;
break;
case 'B':
Bflag = 1;
break;
case 'b':
bflag = 1;
break;
case 'h':
hflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'r':
rflag = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
#define BACKWARD_COMPATIBILITY
#ifdef BACKWARD_COMPATIBILITY
if (*argv) {
system = *argv;
if (*++argv) {
kmemf = *argv;
++kflag;
}
}
#endif
if (system == NULL)
system = (char *)getbootfile();
accessmode = openfiles(system, kmemf, &kvmvars);
mode = getprof(&kvmvars);
if (hflag)
disp = GMON_PROF_OFF;
else if (Bflag)
disp = GMON_PROF_HIRES;
else if (bflag)
disp = GMON_PROF_ON;
else
disp = mode;
if (pflag)
dumpstate(&kvmvars);
if (rflag)
reset(&kvmvars);
if (accessmode == O_RDWR)
setprof(&kvmvars, disp);
(void)fprintf(stdout, "kgmon: kernel profiling is %s.\n",
disp == GMON_PROF_OFF ? "off" :
disp == GMON_PROF_HIRES ? "running (high resolution)" :
disp == GMON_PROF_ON ? "running" :
disp == GMON_PROF_BUSY ? "busy" :
disp == GMON_PROF_ERROR ? "off (error)" :
"in an unknown state");
return (0);
}
static void
usage()
{
fprintf(stderr, "usage: kgmon [-Bbhrp] [-M core] [-N system]\n");
exit(1);
}
/*
* Check that profiling is enabled and open any necessary files.
*/
int
openfiles(system, kmemf, kvp)
char *system;
char *kmemf;
struct kvmvars *kvp;
{
size_t size;
int mib[3], state, openmode;
char errbuf[_POSIX2_LINE_MAX];
if (!kflag) {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_STATE;
size = sizeof state;
if (sysctl(mib, 3, &state, &size, NULL, 0) < 0)
errx(20, "profiling not defined in kernel");
if (!(Bflag || bflag || hflag || rflag ||
(pflag &&
(state == GMON_PROF_HIRES || state == GMON_PROF_ON))))
return (O_RDONLY);
(void)seteuid(0);
if (sysctl(mib, 3, NULL, NULL, &state, size) >= 0)
return (O_RDWR);
(void)seteuid(getuid());
kern_readonly(state);
return (O_RDONLY);
}
openmode = (Bflag || bflag || hflag || pflag || rflag)
? O_RDWR : O_RDONLY;
kvp->kd = kvm_openfiles(system, kmemf, NULL, openmode, errbuf);
if (kvp->kd == NULL) {
if (openmode == O_RDWR) {
openmode = O_RDONLY;
kvp->kd = kvm_openfiles(system, kmemf, NULL, O_RDONLY,
errbuf);
}
if (kvp->kd == NULL)
errx(2, "kvm_openfiles: %s", errbuf);
kern_readonly(GMON_PROF_ON);
}
if (kvm_nlist(kvp->kd, nl) < 0)
errx(3, "%s: no namelist", system);
if (!nl[N_GMONPARAM].n_value)
errx(20, "profiling not defined in kernel");
return (openmode);
}
/*
* Suppress options that require a writable kernel.
*/
void
kern_readonly(mode)
int mode;
{
(void)fprintf(stderr, "kgmon: kernel read-only: ");
if (pflag && (mode == GMON_PROF_HIRES || mode == GMON_PROF_ON))
(void)fprintf(stderr, "data may be inconsistent\n");
if (rflag)
(void)fprintf(stderr, "-r suppressed\n");
if (Bflag)
(void)fprintf(stderr, "-B suppressed\n");
if (bflag)
(void)fprintf(stderr, "-b suppressed\n");
if (hflag)
(void)fprintf(stderr, "-h suppressed\n");
rflag = Bflag = bflag = hflag = 0;
}
/*
* Get the state of kernel profiling.
*/
int
getprof(kvp)
struct kvmvars *kvp;
{
size_t size;
int mib[3];
if (kflag) {
size = kvm_read(kvp->kd, nl[N_GMONPARAM].n_value, &kvp->gpm,
sizeof kvp->gpm);
} else {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_GMONPARAM;
size = sizeof kvp->gpm;
if (sysctl(mib, 3, &kvp->gpm, &size, NULL, 0) < 0)
size = 0;
}
/*
* Accept certain undersized "structs" from old kernels. We need
* everything up to hashfraction, and want profrate and
* histcounter_type. Assume that the kernel doesn't put garbage
* in any padding that is returned instead of profrate and
* histcounter_type. This is a bad assumption for dead kernels,
* since kvm_read() will normally return garbage for bytes beyond
* the end of the actual kernel struct, if any.
*/
if (size < offsetof(struct gmonparam, hashfraction) +
sizeof(kvp->gpm.hashfraction) || size > sizeof(kvp->gpm))
errx(4, "cannot get gmonparam: %s",
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
bzero((char *)&kvp->gpm + size, sizeof(kvp->gpm) - size);
if (kvp->gpm.profrate == 0)
kvp->gpm.profrate = getprofhz(kvp);
#ifdef __i386__
if (kvp->gpm.histcounter_type == 0) {
/*
* This fixup only works for not-so-old i386 kernels. The
* magic 16 is the kernel FUNCTION_ALIGNMENT. 64-bit
* counters are signed; smaller counters are unsigned.
*/
kvp->gpm.histcounter_type = 16 /
(kvp->gpm.textsize / kvp->gpm.kcountsize) * CHAR_BIT;
if (kvp->gpm.histcounter_type == 64)
kvp->gpm.histcounter_type = -64;
}
#endif
return (kvp->gpm.state);
}
/*
* Enable or disable kernel profiling according to the state variable.
*/
void
setprof(kvp, state)
struct kvmvars *kvp;
int state;
{
struct gmonparam *p = (struct gmonparam *)nl[N_GMONPARAM].n_value;
size_t sz;
int mib[3], oldstate;
sz = sizeof(state);
if (!kflag) {
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_STATE;
if (sysctl(mib, 3, &oldstate, &sz, NULL, 0) < 0)
goto bad;
if (oldstate == state)
return;
(void)seteuid(0);
if (sysctl(mib, 3, NULL, NULL, &state, sz) >= 0) {
(void)seteuid(getuid());
return;
}
(void)seteuid(getuid());
} else if (kvm_write(kvp->kd, (u_long)&p->state, (void *)&state, sz)
== sz)
return;
bad:
warnx("warning: cannot turn profiling %s",
state == GMON_PROF_OFF ? "off" : "on");
}
/*
* Build the gmon.out file.
*/
void
dumpstate(kvp)
struct kvmvars *kvp;
{
register FILE *fp;
struct rawarc rawarc;
struct tostruct *tos;
u_long frompc;
u_short *froms, *tickbuf;
size_t i;
int mib[3];
struct gmonhdr h;
int fromindex, endfrom, toindex;
setprof(kvp, GMON_PROF_OFF);
fp = fopen("gmon.out", "w");
if (fp == 0) {
warn("gmon.out");
return;
}
/*
* Build the gmon header and write it to a file.
*/
bzero(&h, sizeof(h));
h.lpc = kvp->gpm.lowpc;
h.hpc = kvp->gpm.highpc;
h.ncnt = kvp->gpm.kcountsize + sizeof(h);
h.version = GMONVERSION;
h.profrate = kvp->gpm.profrate;
h.histcounter_type = kvp->gpm.histcounter_type;
fwrite((char *)&h, sizeof(h), 1, fp);
/*
* Write out the tick buffer.
*/
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
if ((tickbuf = (u_short *)malloc(kvp->gpm.kcountsize)) == NULL)
errx(5, "cannot allocate kcount space");
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.kcount, (void *)tickbuf,
kvp->gpm.kcountsize);
} else {
mib[2] = GPROF_COUNT;
i = kvp->gpm.kcountsize;
if (sysctl(mib, 3, tickbuf, &i, NULL, 0) < 0)
i = 0;
}
if (i != kvp->gpm.kcountsize)
errx(6, "read ticks: read %lu, got %ld: %s",
kvp->gpm.kcountsize, (long)i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
if ((fwrite(tickbuf, kvp->gpm.kcountsize, 1, fp)) != 1)
err(7, "writing tocks to gmon.out");
free(tickbuf);
/*
* Write out the arc info.
*/
if ((froms = (u_short *)malloc(kvp->gpm.fromssize)) == NULL)
errx(8, "cannot allocate froms space");
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.froms, (void *)froms,
kvp->gpm.fromssize);
} else {
mib[2] = GPROF_FROMS;
i = kvp->gpm.fromssize;
if (sysctl(mib, 3, froms, &i, NULL, 0) < 0)
i = 0;
}
if (i != kvp->gpm.fromssize)
errx(9, "read froms: read %lu, got %ld: %s",
kvp->gpm.fromssize, (long)i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
if ((tos = (struct tostruct *)malloc(kvp->gpm.tossize)) == NULL)
errx(10, "cannot allocate tos space");
if (kflag) {
i = kvm_read(kvp->kd, (u_long)kvp->gpm.tos, (void *)tos,
kvp->gpm.tossize);
} else {
mib[2] = GPROF_TOS;
i = kvp->gpm.tossize;
if (sysctl(mib, 3, tos, &i, NULL, 0) < 0)
i = 0;
}
if (i != kvp->gpm.tossize)
errx(11, "read tos: read %lu, got %ld: %s",
kvp->gpm.tossize, (long)i,
kflag ? kvm_geterr(kvp->kd) : strerror(errno));
if (debug)
warnx("lowpc 0x%lx, textsize 0x%lx",
(unsigned long)kvp->gpm.lowpc, kvp->gpm.textsize);
endfrom = kvp->gpm.fromssize / sizeof(*froms);
for (fromindex = 0; fromindex < endfrom; ++fromindex) {
if (froms[fromindex] == 0)
continue;
frompc = (u_long)kvp->gpm.lowpc +
(fromindex * kvp->gpm.hashfraction * sizeof(*froms));
for (toindex = froms[fromindex]; toindex != 0;
toindex = tos[toindex].link) {
if (debug)
warnx("[mcleanup] frompc 0x%lx selfpc 0x%lx "
"count %ld", frompc, tos[toindex].selfpc,
tos[toindex].count);
rawarc.raw_frompc = frompc;
rawarc.raw_selfpc = (u_long)tos[toindex].selfpc;
rawarc.raw_count = tos[toindex].count;
fwrite((char *)&rawarc, sizeof(rawarc), 1, fp);
}
}
fclose(fp);
}
/*
* Get the profiling rate.
*/
int
getprofhz(kvp)
struct kvmvars *kvp;
{
size_t size;
int mib[2], profrate;
struct clockinfo clockrate;
if (kflag) {
profrate = 1;
if (kvm_read(kvp->kd, nl[N_PROFHZ].n_value, &profrate,
sizeof profrate) != sizeof profrate)
warnx("get clockrate: %s", kvm_geterr(kvp->kd));
return (profrate);
}
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
clockrate.profhz = 1;
size = sizeof clockrate;
if (sysctl(mib, 2, &clockrate, &size, NULL, 0) < 0)
warn("get clockrate");
return (clockrate.profhz);
}
/*
* Reset the kernel profiling date structures.
*/
void
reset(kvp)
struct kvmvars *kvp;
{
char *zbuf;
u_long biggest;
int mib[3];
setprof(kvp, GMON_PROF_OFF);
biggest = kvp->gpm.kcountsize;
if (kvp->gpm.fromssize > biggest)
biggest = kvp->gpm.fromssize;
if (kvp->gpm.tossize > biggest)
biggest = kvp->gpm.tossize;
if ((zbuf = (char *)malloc(biggest)) == NULL)
errx(12, "cannot allocate zbuf space");
bzero(zbuf, biggest);
if (kflag) {
if (kvm_write(kvp->kd, (u_long)kvp->gpm.kcount, zbuf,
kvp->gpm.kcountsize) != kvp->gpm.kcountsize)
errx(13, "tickbuf zero: %s", kvm_geterr(kvp->kd));
if (kvm_write(kvp->kd, (u_long)kvp->gpm.froms, zbuf,
kvp->gpm.fromssize) != kvp->gpm.fromssize)
errx(14, "froms zero: %s", kvm_geterr(kvp->kd));
if (kvm_write(kvp->kd, (u_long)kvp->gpm.tos, zbuf,
kvp->gpm.tossize) != kvp->gpm.tossize)
errx(15, "tos zero: %s", kvm_geterr(kvp->kd));
return;
}
(void)seteuid(0);
mib[0] = CTL_KERN;
mib[1] = KERN_PROF;
mib[2] = GPROF_COUNT;
if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.kcountsize) < 0)
err(13, "tickbuf zero");
mib[2] = GPROF_FROMS;
if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.fromssize) < 0)
err(14, "froms zero");
mib[2] = GPROF_TOS;
if (sysctl(mib, 3, NULL, NULL, zbuf, kvp->gpm.tossize) < 0)
err(15, "tos zero");
(void)seteuid(getuid());
free(zbuf);
}
|