summaryrefslogtreecommitdiffstats
path: root/sys-utils/readprofile.c
blob: 132386437620f2d101a08e6eacae28ee9d9731a2 (plain) (blame)
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
/*
 *  readprofile.c - used to read /proc/profile
 *
 *  Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it)
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License along
 *   with this program; if not, write to the Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
 * - added Native Language Support
 * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com>
 * - 64bit clean patch
 * 3Feb2001 Andrew Morton <andrewm@uow.edu.au>
 * - -M option to write profile multiplier.
 * 2001-11-07 Werner Almesberger <wa@almesberger.net>
 * - byte order auto-detection and -n option
 * 2001-11-09 Werner Almesberger <wa@almesberger.net>
 * - skip step size (index 0)
 * 2002-03-09 John Levon <moz@compsoc.man.ac.uk>
 * - make maplineno do something
 * 2002-11-28 Mads Martin Joergensen +
 * - also try /boot/System.map-`uname -r`
 * 2003-04-09 Werner Almesberger <wa@almesberger.net>
 * - fixed off-by eight error and improved heuristics in byte order detection
 * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM>
 * - added -s option; example of use:
 * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3"
 */

#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <unistd.h>

#include "nls.h"
#include "xalloc.h"
#include "closestream.h"

#define S_LEN 128

/* These are the defaults */
static char defaultmap[]="/boot/System.map";
static char defaultpro[]="/proc/profile";

static FILE *myopen(char *name, char *mode, int *flag)
{
	int len = strlen(name);

	if (!strcmp(name + len - 3, ".gz")) {
		FILE *res;
		char *cmdline = xmalloc(len + 6);
		sprintf(cmdline, "zcat %s", name);
		res = popen(cmdline, mode);
		free(cmdline);
		*flag = 1;
		return res;
	}
	*flag = 0;
	return fopen(name, mode);
}

#ifndef BOOT_SYSTEM_MAP
#define BOOT_SYSTEM_MAP "/boot/System.map-"
#endif

static char *boot_uname_r_str(void)
{
	struct utsname uname_info;
	char *s;
	size_t len;

	if (uname(&uname_info))
		return "";
	len = strlen(BOOT_SYSTEM_MAP) + strlen(uname_info.release) + 1;
	s = xmalloc(len);
	strcpy(s, BOOT_SYSTEM_MAP);
	strcat(s, uname_info.release);
	return s;
}

static void __attribute__((__noreturn__)) usage(void)
{
	FILE *out = stdout;
	fputs(USAGE_HEADER, out);
	fprintf(out, _(" %s [options]\n"), program_invocation_short_name);

	fputs(USAGE_SEPARATOR, out);
	fputs(_("Display kernel profiling information.\n"), out);

	fputs(USAGE_OPTIONS, out);
	fprintf(out,
	      _(" -m, --mapfile <mapfile>   (defaults: \"%s\" and\n"), defaultmap);
	fprintf(out,
	      _("                                      \"%s\")\n"), boot_uname_r_str());
	fprintf(out,
	      _(" -p, --profile <pro-file>  (default:  \"%s\")\n"), defaultpro);
	fputs(_(" -M, --multiplier <mult>   set the profiling multiplier to <mult>\n"), out);
	fputs(_(" -i, --info                print only info about the sampling step\n"), out);
	fputs(_(" -v, --verbose             print verbose data\n"), out);
	fputs(_(" -a, --all                 print all symbols, even if count is 0\n"), out);
	fputs(_(" -b, --histbin             print individual histogram-bin counts\n"), out);
	fputs(_(" -s, --counters            print individual counters within functions\n"), out);
	fputs(_(" -r, --reset               reset all the counters (root only)\n"), out);
	fputs(_(" -n, --no-auto             disable byte order auto-detection\n"), out);
	fputs(USAGE_SEPARATOR, out);
	printf(USAGE_HELP_OPTIONS(27));
	printf(USAGE_MAN_TAIL("readprofile(8)"));
	exit(EXIT_SUCCESS);
}

int main(int argc, char **argv)
{
	FILE *map;
	int proFd;
	char *mapFile, *proFile, *mult = NULL;
	size_t len = 0, indx = 1;
	unsigned long long add0 = 0;
	unsigned int step;
	unsigned int *buf, total, fn_len;
	unsigned long long fn_add = 0, next_add; /* current and next address */
	char fn_name[S_LEN], next_name[S_LEN];	/* current and next name */
	char mode[8];
	int c;
	ssize_t rc;
	int optAll = 0, optInfo = 0, optReset = 0, optVerbose = 0, optNative = 0;
	int optBins = 0, optSub = 0;
	char mapline[S_LEN];
	int maplineno = 1;
	int popenMap;		/* flag to tell if popen() has been used */
	int header_printed;

	static const struct option longopts[] = {
		{"mapfile", required_argument, NULL, 'm'},
		{"profile", required_argument, NULL, 'p'},
		{"multiplier", required_argument, NULL, 'M'},
		{"info", no_argument, NULL, 'i'},
		{"verbose", no_argument, NULL, 'v'},
		{"all", no_argument, NULL, 'a'},
		{"histbin", no_argument, NULL, 'b'},
		{"counters", no_argument, NULL, 's'},
		{"reset", no_argument, NULL, 'r'},
		{"no-auto", no_argument, NULL, 'n'},
		{"version", no_argument, NULL, 'V'},
		{"help", no_argument, NULL, 'h'},
		{NULL, 0, NULL, 0}
	};

#define next (current^1)

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	close_stdout_atexit();

	proFile = defaultpro;
	mapFile = defaultmap;

	while ((c = getopt_long(argc, argv, "m:p:M:ivabsrnVh", longopts, NULL)) != -1) {
		switch (c) {
		case 'm':
			mapFile = optarg;
			break;
		case 'n':
			optNative++;
			break;
		case 'p':
			proFile = optarg;
			break;
		case 'a':
			optAll++;
			break;
		case 'b':
			optBins++;
			break;
		case 's':
			optSub++;
			break;
		case 'i':
			optInfo++;
			break;
		case 'M':
			mult = optarg;
			break;
		case 'r':
			optReset++;
			break;
		case 'v':
			optVerbose++;
			break;

		case 'V':
			print_version(EXIT_SUCCESS);
		case 'h':
			usage();
		default:
			errtryhelp(EXIT_FAILURE);
		}
	}

	if (optReset || mult) {
		int multiplier, fd, to_write;

		/* When writing the multiplier, if the length of the
		 * write is not sizeof(int), the multiplier is not
		 * changed. */
		if (mult) {
			multiplier = strtoul(mult, NULL, 10);
			to_write = sizeof(int);
		} else {
			multiplier = 0;
			/* sth different from sizeof(int) */
			to_write = 1;
		}
		/* try to become root, just in case */
		ignore_result( setuid(0) );
		fd = open(defaultpro, O_WRONLY);
		if (fd < 0)
			err(EXIT_FAILURE, "%s", defaultpro);
		if (write(fd, &multiplier, to_write) != to_write)
			err(EXIT_FAILURE, _("error writing %s"), defaultpro);
		close(fd);
		exit(EXIT_SUCCESS);
	}

	/* Use an fd for the profiling buffer, to skip stdio overhead */
	if (((proFd = open(proFile, O_RDONLY)) < 0)
	    || ((int)(len = lseek(proFd, 0, SEEK_END)) < 0)
	    || (lseek(proFd, 0, SEEK_SET) < 0))
		err(EXIT_FAILURE, "%s", proFile);
	if (!len)
		errx(EXIT_FAILURE, "%s: %s", proFile, _("input file is empty"));

	buf = xmalloc(len);

	rc = read(proFd, buf, len);
	if (rc < 0 || (size_t) rc != len)
		err(EXIT_FAILURE, "%s", proFile);
	close(proFd);

	if (!optNative) {
		int entries = len / sizeof(*buf);
		int big = 0, small = 0;
		unsigned *p;
		size_t i;

		for (p = buf + 1; p < buf + entries; p++) {
			if (*p & ~0U << ((unsigned) sizeof(*buf) * 4U))
				big++;
			if (*p & ((1U << ((unsigned) sizeof(*buf) * 4U)) - 1U))
				small++;
		}
		if (big > small) {
			warnx(_("Assuming reversed byte order. "
				"Use -n to force native byte order."));
			for (p = buf; p < buf + entries; p++)
				for (i = 0; i < sizeof(*buf) / 2; i++) {
					unsigned char *b = (unsigned char *)p;
					unsigned char tmp;
					tmp = b[i];
					b[i] = b[sizeof(*buf) - i - 1];
					b[sizeof(*buf) - i - 1] = tmp;
				}
		}
	}

	step = buf[0];
	if (optInfo) {
		printf(_("Sampling_step: %u\n"), step);
		exit(EXIT_SUCCESS);
	}

	total = 0;

	map = myopen(mapFile, "r", &popenMap);
	if (map == NULL && mapFile == defaultmap) {
		mapFile = boot_uname_r_str();
		map = myopen(mapFile, "r", &popenMap);
	}
	if (map == NULL)
		err(EXIT_FAILURE, "%s", mapFile);

	while (fgets(mapline, S_LEN, map)) {
		if (sscanf(mapline, "%llx %7[^\n ] %127[^\n ]", &fn_add, mode, fn_name) != 3)
			errx(EXIT_FAILURE, _("%s(%i): wrong map line"), mapFile,
			     maplineno);
		/* only elf works like this */
		if (!strcmp(fn_name, "_stext") || !strcmp(fn_name, "__stext")) {
			add0 = fn_add;
			break;
		}
		maplineno++;
	}

	if (!add0)
		errx(EXIT_FAILURE, _("can't find \"_stext\" in %s"), mapFile);

	/*
	 * Main loop.
	 */
	while (fgets(mapline, S_LEN, map)) {
		unsigned int this = 0;
		int done = 0;

		if (sscanf(mapline, "%llx %7[^\n ] %127[^\n ]", &next_add, mode, next_name) != 3)
			errx(EXIT_FAILURE, _("%s(%i): wrong map line"), mapFile,
			     maplineno);
		header_printed = 0;

		/* the kernel only profiles up to _etext */
		if (!strcmp(next_name, "_etext") ||
		    !strcmp(next_name, "__etext"))
			done = 1;
		else {
			/* ignore any LEADING (before a '[tT]' symbol
			 * is found) Absolute symbols and __init_end
			 * because some architectures place it before
			 * .text section */
			if ((*mode == 'A' || *mode == '?')
			    && (total == 0 || !strcmp(next_name, "__init_end")))
				continue;
			if (*mode != 'T' && *mode != 't' &&
			    *mode != 'W' && *mode != 'w')
				break;	/* only text is profiled */
		}

		if (indx >= len / sizeof(*buf))
			errx(EXIT_FAILURE,
			     _("profile address out of range. Wrong map file?"));

		while (indx < (next_add - add0) / step) {
			if (optBins && (buf[indx] || optAll)) {
				if (!header_printed) {
					printf("%s:\n", fn_name);
					header_printed = 1;
				}
				printf("\t%llx\t%u\n", (indx - 1) * step + add0,
				       buf[indx]);
			}
			this += buf[indx++];
		}
		total += this;

		if (optBins) {
			if (optVerbose || this > 0)
				printf("  total\t\t\t\t%u\n", this);
		} else if ((this || optAll) &&
			   (fn_len = next_add - fn_add) != 0) {
			if (optVerbose)
				printf("%016llx %-40s %6u %8.4f\n", fn_add,
				       fn_name, this, this / (double)fn_len);
			else
				printf("%6u %-40s %8.4f\n",
				       this, fn_name, this / (double)fn_len);
			if (optSub) {
				unsigned long long scan;

				for (scan = (fn_add - add0) / step + 1;
				     scan < (next_add - add0) / step;
				     scan++) {
					unsigned long long addr;
					addr = (scan - 1) * step + add0;
					printf("\t%#llx\t%s+%#llx\t%u\n",
					       addr, fn_name, addr - fn_add,
					       buf[scan]);
				}
			}
		}

		fn_add = next_add;
		strcpy(fn_name, next_name);

		maplineno++;
		if (done)
			break;
	}

	/* clock ticks, out of kernel text - probably modules */
	printf("%6u %s\n", buf[len / sizeof(*buf) - 1], "*unknown*");

	/* trailer */
	if (optVerbose)
		printf("%016x %-40s %6u %8.4f\n",
		       0, "total", total, total / (double)(fn_add - add0));
	else
		printf("%6u %-40s %8.4f\n",
		       total, _("total"), total / (double)(fn_add - add0));

	popenMap ? pclose(map) : fclose(map);
	exit(EXIT_SUCCESS);
}