summaryrefslogtreecommitdiff
path: root/tools/proftool.c
blob: fecb9d6e99c254e412db87a4a22eb4a4d6caca91 (plain)
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
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2013 Google, Inc
 */

/* Decode and dump U-Boot profiling information */

#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <regex.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/types.h>

#include <compiler.h>
#include <trace.h>

#define MAX_LINE_LEN 500

enum {
	FUNCF_TRACE	= 1 << 0,	/* Include this function in trace */
};

struct func_info {
	unsigned long offset;
	const char *name;
	unsigned long code_size;
	unsigned long call_count;
	unsigned flags;
	/* the section this function is in */
	struct objsection_info *objsection;
};

enum trace_line_type {
	TRACE_LINE_INCLUDE,
	TRACE_LINE_EXCLUDE,
};

struct trace_configline_info {
	struct trace_configline_info *next;
	enum trace_line_type type;
	const char *name;	/* identifier name / wildcard */
	regex_t regex;		/* Regex to use if name starts with / */
};

/* The contents of the trace config file */
struct trace_configline_info *trace_config_head;

struct func_info *func_list;
int func_count;
struct trace_call *call_list;
int call_count;
int verbose;	/* Verbosity level 0=none, 1=warn, 2=notice, 3=info, 4=debug */
unsigned long text_offset;		/* text address of first function */

static void outf(int level, const char *fmt, ...)
		__attribute__ ((format (__printf__, 2, 3)));
#define error(fmt, b...) outf(0, fmt, ##b)
#define warn(fmt, b...) outf(1, fmt, ##b)
#define notice(fmt, b...) outf(2, fmt, ##b)
#define info(fmt, b...) outf(3, fmt, ##b)
#define debug(fmt, b...) outf(4, fmt, ##b)


static void outf(int level, const char *fmt, ...)
{
	if (verbose >= level) {
		va_list args;

		va_start(args, fmt);
		vfprintf(stderr, fmt, args);
		va_end(args);
	}
}

static void usage(void)
{
	fprintf(stderr,
		"Usage: proftool -cds -v3 <cmd> <profdata>\n"
		"\n"
		"Commands\n"
		"   dump-ftrace\t\tDump out textual data in ftrace format\n"
		"\n"
		"Options:\n"
		"   -m <map>\tSpecify Systen.map file\n"
		"   -t <trace>\tSpecific trace data file (from U-Boot)\n"
		"   -v <0-4>\tSpecify verbosity\n");
	exit(EXIT_FAILURE);
}

static int h_cmp_offset(const void *v1, const void *v2)
{
	const struct func_info *f1 = v1, *f2 = v2;

	return (f1->offset / FUNC_SITE_SIZE) - (f2->offset / FUNC_SITE_SIZE);
}

static int read_system_map(FILE *fin)
{
	unsigned long offset, start = 0;
	struct func_info *func;
	char buff[MAX_LINE_LEN];
	char symtype;
	char symname[MAX_LINE_LEN + 1];
	int linenum;
	int alloced;

	for (linenum = 1, alloced = func_count = 0;; linenum++) {
		int fields = 0;

		if (fgets(buff, sizeof(buff), fin))
			fields = sscanf(buff, "%lx %c %100s\n", &offset,
				&symtype, symname);
		if (fields == 2) {
			continue;
		} else if (feof(fin)) {
			break;
		} else if (fields < 2) {
			error("Map file line %d: invalid format\n", linenum);
			return 1;
		}

		/* Must be a text symbol */
		symtype = tolower(symtype);
		if (symtype != 't' && symtype != 'w')
			continue;

		if (func_count == alloced) {
			alloced += 256;
			func_list = realloc(func_list,
					sizeof(struct func_info) * alloced);
			assert(func_list);
		}
		if (!func_count)
			start = offset;

		func = &func_list[func_count++];
		memset(func, '\0', sizeof(*func));
		func->offset = offset - start;
		func->name = strdup(symname);
		func->flags = FUNCF_TRACE;	/* trace by default */

		/* Update previous function's code size */
		if (func_count > 1)
			func[-1].code_size = func->offset - func[-1].offset;
	}
	notice("%d functions found in map file\n", func_count);
	text_offset = start;
	return 0;
}

static int read_data(FILE *fin, void *buff, int size)
{
	int err;

	err = fread(buff, 1, size, fin);
	if (!err)
		return 1;
	if (err != size) {
		error("Cannot read profile file at pos %ld\n", ftell(fin));
		return -1;
	}
	return 0;
}

static struct func_info *find_func_by_offset(uint32_t offset)
{
	struct func_info key, *found;

	key.offset = offset;
	found = bsearch(&key, func_list, func_count, sizeof(struct func_info),
			h_cmp_offset);

	return found;
}

/* This finds the function which contains the given offset */
static struct func_info *find_caller_by_offset(uint32_t offset)
{
	int low;	/* least function that could be a match */
	int high;	/* greated function that could be a match */
	struct func_info key;

	low = 0;
	high = func_count - 1;
	key.offset = offset;
	while (high > low + 1) {
		int mid = (low + high) / 2;
		int result;

		result = h_cmp_offset(&key, &func_list[mid]);
		if (result > 0)
			low = mid;
		else if (result < 0)
			high = mid;
		else
			return &func_list[mid];
	}

	return low >= 0 ? &func_list[low] : NULL;
}

static int read_calls(FILE *fin, size_t count)
{
	struct trace_call *call_data;
	int i;

	notice("call count: %zu\n", count);
	call_list = (struct trace_call *)calloc(count, sizeof(*call_data));
	if (!call_list) {
		error("Cannot allocate call_list\n");
		return -1;
	}
	call_count = count;

	call_data = call_list;
	for (i = 0; i < count; i++, call_data++) {
		if (read_data(fin, call_data, sizeof(*call_data)))
			return 1;
	}
	return 0;
}

static int read_profile(FILE *fin, int *not_found)
{
	struct trace_output_hdr hdr;

	*not_found = 0;
	while (!feof(fin)) {
		int err;

		err = read_data(fin, &hdr, sizeof(hdr));
		if (err == 1)
			break; /* EOF */
		else if (err)
			return 1;

		switch (hdr.type) {
		case TRACE_CHUNK_FUNCS:
			/* Ignored at present */
			break;

		case TRACE_CHUNK_CALLS:
			if (read_calls(fin, hdr.rec_count))
				return 1;
			break;
		}
	}
	return 0;
}

static int read_map_file(const char *fname)
{
	FILE *fmap;
	int err = 0;

	fmap = fopen(fname, "r");
	if (!fmap) {
		error("Cannot open map file '%s'\n", fname);
		return 1;
	}
	if (fmap) {
		err = read_system_map(fmap);
		fclose(fmap);
	}
	return err;
}

static int read_profile_file(const char *fname)
{
	int not_found = INT_MAX;
	FILE *fprof;
	int err;

	fprof = fopen(fname, "rb");
	if (!fprof) {
		error("Cannot open profile data file '%s'\n",
		      fname);
		return 1;
	} else {
		err = read_profile(fprof, &not_found);
		fclose(fprof);
		if (err)
			return err;

		if (not_found) {
			warn("%d profile functions could not be found in the map file - are you sure that your profile data and map file correspond?\n",
			     not_found);
			return 1;
		}
	}
	return 0;
}

static int regex_report_error(regex_t *regex, int err, const char *op,
			      const char *name)
{
	char buf[200];

	regerror(err, regex, buf, sizeof(buf));
	error("Regex error '%s' in %s '%s'\n", buf, op, name);
	return -1;
}

static void check_trace_config_line(struct trace_configline_info *item)
{
	struct func_info *func, *end;
	int err;

	debug("Checking trace config line '%s'\n", item->name);
	for (func = func_list, end = func + func_count; func < end; func++) {
		err = regexec(&item->regex, func->name, 0, NULL, 0);
		debug("   - regex '%s', string '%s': %d\n", item->name,
		      func->name, err);
		if (err == REG_NOMATCH)
			continue;

		if (err) {
			regex_report_error(&item->regex, err, "match",
					   item->name);
			break;
		}

		/* It matches, so perform the action */
		switch (item->type) {
		case TRACE_LINE_INCLUDE:
			info("      include %s at %lx\n", func->name,
			     text_offset + func->offset);
			func->flags |= FUNCF_TRACE;
			break;

		case TRACE_LINE_EXCLUDE:
			info("      exclude %s at %lx\n", func->name,
			     text_offset + func->offset);
			func->flags &= ~FUNCF_TRACE;
			break;
		}
	}
}

static void check_trace_config(void)
{
	struct trace_configline_info *line;

	for (line = trace_config_head; line; line = line->next)
		check_trace_config_line(line);
}

/**
 * Check the functions to see if they each have an objsection. If not, then
 * the linker must have eliminated them.
 */
static void check_functions(void)
{
	struct func_info *func, *end;
	unsigned long removed_code_size = 0;
	int not_found = 0;

	/* Look for missing functions */
	for (func = func_list, end = func + func_count; func < end; func++) {
		if (!func->objsection) {
			removed_code_size += func->code_size;
			not_found++;
		}
	}

	/* Figure out what functions we want to trace */
	check_trace_config();

	warn("%d functions removed by linker, %ld code size\n",
	     not_found, removed_code_size);
}

static int read_trace_config(FILE *fin)
{
	char buff[200];
	int linenum = 0;
	struct trace_configline_info **tailp = &trace_config_head;

	while (fgets(buff, sizeof(buff), fin)) {
		int len = strlen(buff);
		struct trace_configline_info *line;
		char *saveptr;
		char *s, *tok;
		int err;

		linenum++;
		if (len && buff[len - 1] == '\n')
			buff[len - 1] = '\0';

		/* skip blank lines and comments */
		for (s = buff; *s == ' ' || *s == '\t'; s++)
			;
		if (!*s || *s == '#')
			continue;

		line = (struct trace_configline_info *)calloc(1,
							      sizeof(*line));
		if (!line) {
			error("Cannot allocate config line\n");
			return -1;
		}

		tok = strtok_r(s, " \t", &saveptr);
		if (!tok) {
			error("Invalid trace config data on line %d\n",
			      linenum);
			return -1;
		}
		if (0 == strcmp(tok, "include-func")) {
			line->type = TRACE_LINE_INCLUDE;
		} else if (0 == strcmp(tok, "exclude-func")) {
			line->type = TRACE_LINE_EXCLUDE;
		} else {
			error("Unknown command in trace config data line %d\n",
			      linenum);
			return -1;
		}

		tok = strtok_r(NULL, " \t", &saveptr);
		if (!tok) {
			error("Missing pattern in trace config data line %d\n",
			      linenum);
			return -1;
		}

		err = regcomp(&line->regex, tok, REG_NOSUB);
		if (err) {
			int r = regex_report_error(&line->regex, err,
						   "compile", tok);
			free(line);
			return r;
		}

		/* link this new one to the end of the list */
		line->name = strdup(tok);
		line->next = NULL;
		*tailp = line;
		tailp = &line->next;
	}

	if (!feof(fin)) {
		error("Cannot read from trace config file at position %ld\n",
		      ftell(fin));
		return -1;
	}
	return 0;
}

static int read_trace_config_file(const char *fname)
{
	FILE *fin;
	int err;

	fin = fopen(fname, "r");
	if (!fin) {
		error("Cannot open trace_config file '%s'\n", fname);
		return -1;
	}
	err = read_trace_config(fin);
	fclose(fin);
	return err;
}

static void out_func(ulong func_offset, int is_caller, const char *suffix)
{
	struct func_info *func;

	func = (is_caller ? find_caller_by_offset : find_func_by_offset)
		(func_offset);

	if (func)
		printf("%s%s", func->name, suffix);
	else
		printf("%lx%s", func_offset, suffix);
}

/*
 * # tracer: function
 * #
 * #           TASK-PID   CPU#    TIMESTAMP  FUNCTION
 * #              | |      |          |         |
 * #           bash-4251  [01] 10152.583854: path_put <-path_walk
 * #           bash-4251  [01] 10152.583855: dput <-path_put
 * #           bash-4251  [01] 10152.583855: _atomic_dec_and_lock <-dput
 */
static int make_ftrace(void)
{
	struct trace_call *call;
	int missing_count = 0, skip_count = 0;
	int i;

	printf("# tracer: ftrace\n"
		"#\n"
		"#           TASK-PID   CPU#    TIMESTAMP  FUNCTION\n"
		"#              | |      |          |         |\n");
	for (i = 0, call = call_list; i < call_count; i++, call++) {
		struct func_info *func = find_func_by_offset(call->func);
		ulong time = call->flags & FUNCF_TIMESTAMP_MASK;

		if (TRACE_CALL_TYPE(call) != FUNCF_ENTRY &&
		    TRACE_CALL_TYPE(call) != FUNCF_EXIT)
			continue;
		if (!func) {
			warn("Cannot find function at %lx\n",
			     text_offset + call->func);
			missing_count++;
			continue;
		}

		if (!(func->flags & FUNCF_TRACE)) {
			debug("Funcion '%s' is excluded from trace\n",
			      func->name);
			skip_count++;
			continue;
		}

		printf("%16s-%-5d [01] %lu.%06lu: ", "uboot", 1,
		       time / 1000000, time % 1000000);

		out_func(call->func, 0, " <- ");
		out_func(call->caller, 1, "\n");
	}
	info("ftrace: %d functions not found, %d excluded\n", missing_count,
	     skip_count);

	return 0;
}

static int prof_tool(int argc, char * const argv[],
		     const char *prof_fname, const char *map_fname,
		     const char *trace_config_fname)
{
	int err = 0;

	if (read_map_file(map_fname))
		return -1;
	if (prof_fname && read_profile_file(prof_fname))
		return -1;
	if (trace_config_fname && read_trace_config_file(trace_config_fname))
		return -1;

	check_functions();

	for (; argc; argc--, argv++) {
		const char *cmd = *argv;

		if (0 == strcmp(cmd, "dump-ftrace"))
			err = make_ftrace();
		else
			warn("Unknown command '%s'\n", cmd);
	}

	return err;
}

int main(int argc, char *argv[])
{
	const char *map_fname = "System.map";
	const char *prof_fname = NULL;
	const char *trace_config_fname = NULL;
	int opt;

	verbose = 2;
	while ((opt = getopt(argc, argv, "m:p:t:v:")) != -1) {
		switch (opt) {
		case 'm':
			map_fname = optarg;
			break;

		case 'p':
			prof_fname = optarg;
			break;

		case 't':
			trace_config_fname = optarg;
			break;

		case 'v':
			verbose = atoi(optarg);
			break;

		default:
			usage();
		}
	}
	argc -= optind; argv += optind;
	if (argc < 1)
		usage();

	debug("Debug enabled\n");
	return prof_tool(argc, argv, prof_fname, map_fname,
			 trace_config_fname);
}