summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/dso.c
blob: be437850edc88445fe77f2ea2b40ff154c64c104 (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
#include "symbol.h"
#include "dso.h"
#include "machine.h"
#include "util.h"
#include "debug.h"

char dso__symtab_origin(const struct dso *dso)
{
	static const char origin[] = {
		[DSO_BINARY_TYPE__KALLSYMS]		= 'k',
		[DSO_BINARY_TYPE__VMLINUX]		= 'v',
		[DSO_BINARY_TYPE__JAVA_JIT]		= 'j',
		[DSO_BINARY_TYPE__DEBUGLINK]		= 'l',
		[DSO_BINARY_TYPE__BUILD_ID_CACHE]	= 'B',
		[DSO_BINARY_TYPE__FEDORA_DEBUGINFO]	= 'f',
		[DSO_BINARY_TYPE__UBUNTU_DEBUGINFO]	= 'u',
		[DSO_BINARY_TYPE__BUILDID_DEBUGINFO]	= 'b',
		[DSO_BINARY_TYPE__SYSTEM_PATH_DSO]	= 'd',
		[DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE]	= 'K',
		[DSO_BINARY_TYPE__GUEST_KALLSYMS]	= 'g',
		[DSO_BINARY_TYPE__GUEST_KMODULE]	= 'G',
		[DSO_BINARY_TYPE__GUEST_VMLINUX]	= 'V',
	};

	if (dso == NULL || dso->symtab_type == DSO_BINARY_TYPE__NOT_FOUND)
		return '!';
	return origin[dso->symtab_type];
}

int dso__binary_type_file(struct dso *dso, enum dso_binary_type type,
			  char *root_dir, char *file, size_t size)
{
	char build_id_hex[BUILD_ID_SIZE * 2 + 1];
	int ret = 0;

	switch (type) {
	case DSO_BINARY_TYPE__DEBUGLINK: {
		char *debuglink;

		strncpy(file, dso->long_name, size);
		debuglink = file + dso->long_name_len;
		while (debuglink != file && *debuglink != '/')
			debuglink--;
		if (*debuglink == '/')
			debuglink++;
		filename__read_debuglink(dso->long_name, debuglink,
					 size - (debuglink - file));
		}
		break;
	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
		/* skip the locally configured cache if a symfs is given */
		if (symbol_conf.symfs[0] ||
		    (dso__build_id_filename(dso, file, size) == NULL))
			ret = -1;
		break;

	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
		snprintf(file, size, "%s/usr/lib/debug%s.debug",
			 symbol_conf.symfs, dso->long_name);
		break;

	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
		snprintf(file, size, "%s/usr/lib/debug%s",
			 symbol_conf.symfs, dso->long_name);
		break;

	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
		if (!dso->has_build_id) {
			ret = -1;
			break;
		}

		build_id__sprintf(dso->build_id,
				  sizeof(dso->build_id),
				  build_id_hex);
		snprintf(file, size,
			 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
			 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
		break;

	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
		snprintf(file, size, "%s%s",
			 symbol_conf.symfs, dso->long_name);
		break;

	case DSO_BINARY_TYPE__GUEST_KMODULE:
		snprintf(file, size, "%s%s%s", symbol_conf.symfs,
			 root_dir, dso->long_name);
		break;

	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
		snprintf(file, size, "%s%s", symbol_conf.symfs,
			 dso->long_name);
		break;

	default:
	case DSO_BINARY_TYPE__KALLSYMS:
	case DSO_BINARY_TYPE__VMLINUX:
	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
	case DSO_BINARY_TYPE__GUEST_VMLINUX:
	case DSO_BINARY_TYPE__JAVA_JIT:
	case DSO_BINARY_TYPE__NOT_FOUND:
		ret = -1;
		break;
	}

	return ret;
}

static int open_dso(struct dso *dso, struct machine *machine)
{
	char *root_dir = (char *) "";
	char *name;
	int fd;

	name = malloc(PATH_MAX);
	if (!name)
		return -ENOMEM;

	if (machine)
		root_dir = machine->root_dir;

	if (dso__binary_type_file(dso, dso->data_type,
				  root_dir, name, PATH_MAX)) {
		free(name);
		return -EINVAL;
	}

	fd = open(name, O_RDONLY);
	free(name);
	return fd;
}

int dso__data_fd(struct dso *dso, struct machine *machine)
{
	static enum dso_binary_type binary_type_data[] = {
		DSO_BINARY_TYPE__BUILD_ID_CACHE,
		DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
		DSO_BINARY_TYPE__NOT_FOUND,
	};
	int i = 0;

	if (dso->data_type != DSO_BINARY_TYPE__NOT_FOUND)
		return open_dso(dso, machine);

	do {
		int fd;

		dso->data_type = binary_type_data[i++];

		fd = open_dso(dso, machine);
		if (fd >= 0)
			return fd;

	} while (dso->data_type != DSO_BINARY_TYPE__NOT_FOUND);

	return -EINVAL;
}

static void
dso_cache__free(struct rb_root *root)
{
	struct rb_node *next = rb_first(root);

	while (next) {
		struct dso_cache *cache;

		cache = rb_entry(next, struct dso_cache, rb_node);
		next = rb_next(&cache->rb_node);
		rb_erase(&cache->rb_node, root);
		free(cache);
	}
}

static struct dso_cache*
dso_cache__find(struct rb_root *root, u64 offset)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct dso_cache *cache;

	while (*p != NULL) {
		u64 end;

		parent = *p;
		cache = rb_entry(parent, struct dso_cache, rb_node);
		end = cache->offset + DSO__DATA_CACHE_SIZE;

		if (offset < cache->offset)
			p = &(*p)->rb_left;
		else if (offset >= end)
			p = &(*p)->rb_right;
		else
			return cache;
	}
	return NULL;
}

static void
dso_cache__insert(struct rb_root *root, struct dso_cache *new)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct dso_cache *cache;
	u64 offset = new->offset;

	while (*p != NULL) {
		u64 end;

		parent = *p;
		cache = rb_entry(parent, struct dso_cache, rb_node);
		end = cache->offset + DSO__DATA_CACHE_SIZE;

		if (offset < cache->offset)
			p = &(*p)->rb_left;
		else if (offset >= end)
			p = &(*p)->rb_right;
	}

	rb_link_node(&new->rb_node, parent, p);
	rb_insert_color(&new->rb_node, root);
}

static ssize_t
dso_cache__memcpy(struct dso_cache *cache, u64 offset,
		  u8 *data, u64 size)
{
	u64 cache_offset = offset - cache->offset;
	u64 cache_size   = min(cache->size - cache_offset, size);

	memcpy(data, cache->data + cache_offset, cache_size);
	return cache_size;
}

static ssize_t
dso_cache__read(struct dso *dso, struct machine *machine,
		 u64 offset, u8 *data, ssize_t size)
{
	struct dso_cache *cache;
	ssize_t ret;
	int fd;

	fd = dso__data_fd(dso, machine);
	if (fd < 0)
		return -1;

	do {
		u64 cache_offset;

		ret = -ENOMEM;

		cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
		if (!cache)
			break;

		cache_offset = offset & DSO__DATA_CACHE_MASK;
		ret = -EINVAL;

		if (-1 == lseek(fd, cache_offset, SEEK_SET))
			break;

		ret = read(fd, cache->data, DSO__DATA_CACHE_SIZE);
		if (ret <= 0)
			break;

		cache->offset = cache_offset;
		cache->size   = ret;
		dso_cache__insert(&dso->cache, cache);

		ret = dso_cache__memcpy(cache, offset, data, size);

	} while (0);

	if (ret <= 0)
		free(cache);

	close(fd);
	return ret;
}

static ssize_t dso_cache_read(struct dso *dso, struct machine *machine,
			      u64 offset, u8 *data, ssize_t size)
{
	struct dso_cache *cache;

	cache = dso_cache__find(&dso->cache, offset);
	if (cache)
		return dso_cache__memcpy(cache, offset, data, size);
	else
		return dso_cache__read(dso, machine, offset, data, size);
}

ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
			      u64 offset, u8 *data, ssize_t size)
{
	ssize_t r = 0;
	u8 *p = data;

	do {
		ssize_t ret;

		ret = dso_cache_read(dso, machine, offset, p, size);
		if (ret < 0)
			return ret;

		/* Reached EOF, return what we have. */
		if (!ret)
			break;

		BUG_ON(ret > size);

		r      += ret;
		p      += ret;
		offset += ret;
		size   -= ret;

	} while (size);

	return r;
}

ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
			    struct machine *machine, u64 addr,
			    u8 *data, ssize_t size)
{
	u64 offset = map->map_ip(map, addr);
	return dso__data_read_offset(dso, machine, offset, data, size);
}

struct map *dso__new_map(const char *name)
{
	struct map *map = NULL;
	struct dso *dso = dso__new(name);

	if (dso)
		map = map__new2(0, dso, MAP__FUNCTION);

	return map;
}

struct dso *dso__kernel_findnew(struct machine *machine, const char *name,
		    const char *short_name, int dso_type)
{
	/*
	 * The kernel dso could be created by build_id processing.
	 */
	struct dso *dso = __dsos__findnew(&machine->kernel_dsos, name);

	/*
	 * We need to run this in all cases, since during the build_id
	 * processing we had no idea this was the kernel dso.
	 */
	if (dso != NULL) {
		dso__set_short_name(dso, short_name);
		dso->kernel = dso_type;
	}

	return dso;
}

void dso__set_long_name(struct dso *dso, char *name)
{
	if (name == NULL)
		return;
	dso->long_name = name;
	dso->long_name_len = strlen(name);
}

void dso__set_short_name(struct dso *dso, const char *name)
{
	if (name == NULL)
		return;
	dso->short_name = name;
	dso->short_name_len = strlen(name);
}

static void dso__set_basename(struct dso *dso)
{
	dso__set_short_name(dso, basename(dso->long_name));
}

int dso__name_len(const struct dso *dso)
{
	if (!dso)
		return strlen("[unknown]");
	if (verbose)
		return dso->long_name_len;

	return dso->short_name_len;
}

bool dso__loaded(const struct dso *dso, enum map_type type)
{
	return dso->loaded & (1 << type);
}

bool dso__sorted_by_name(const struct dso *dso, enum map_type type)
{
	return dso->sorted_by_name & (1 << type);
}

void dso__set_sorted_by_name(struct dso *dso, enum map_type type)
{
	dso->sorted_by_name |= (1 << type);
}

struct dso *dso__new(const char *name)
{
	struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);

	if (dso != NULL) {
		int i;
		strcpy(dso->name, name);
		dso__set_long_name(dso, dso->name);
		dso__set_short_name(dso, dso->name);
		for (i = 0; i < MAP__NR_TYPES; ++i)
			dso->symbols[i] = dso->symbol_names[i] = RB_ROOT;
		dso->cache = RB_ROOT;
		dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
		dso->data_type   = DSO_BINARY_TYPE__NOT_FOUND;
		dso->loaded = 0;
		dso->sorted_by_name = 0;
		dso->has_build_id = 0;
		dso->kernel = DSO_TYPE_USER;
		dso->needs_swap = DSO_SWAP__UNSET;
		INIT_LIST_HEAD(&dso->node);
	}

	return dso;
}

void dso__delete(struct dso *dso)
{
	int i;
	for (i = 0; i < MAP__NR_TYPES; ++i)
		symbols__delete(&dso->symbols[i]);
	if (dso->sname_alloc)
		free((char *)dso->short_name);
	if (dso->lname_alloc)
		free(dso->long_name);
	dso_cache__free(&dso->cache);
	free(dso);
}

void dso__set_build_id(struct dso *dso, void *build_id)
{
	memcpy(dso->build_id, build_id, sizeof(dso->build_id));
	dso->has_build_id = 1;
}

bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
{
	return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
}

void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
{
	char path[PATH_MAX];

	if (machine__is_default_guest(machine))
		return;
	sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
	if (sysfs__read_build_id(path, dso->build_id,
				 sizeof(dso->build_id)) == 0)
		dso->has_build_id = true;
}

int dso__kernel_module_get_build_id(struct dso *dso,
				    const char *root_dir)
{
	char filename[PATH_MAX];
	/*
	 * kernel module short names are of the form "[module]" and
	 * we need just "module" here.
	 */
	const char *name = dso->short_name + 1;

	snprintf(filename, sizeof(filename),
		 "%s/sys/module/%.*s/notes/.note.gnu.build-id",
		 root_dir, (int)strlen(name) - 1, name);

	if (sysfs__read_build_id(filename, dso->build_id,
				 sizeof(dso->build_id)) == 0)
		dso->has_build_id = true;

	return 0;
}

bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
{
	bool have_build_id = false;
	struct dso *pos;

	list_for_each_entry(pos, head, node) {
		if (with_hits && !pos->hit)
			continue;
		if (pos->has_build_id) {
			have_build_id = true;
			continue;
		}
		if (filename__read_build_id(pos->long_name, pos->build_id,
					    sizeof(pos->build_id)) > 0) {
			have_build_id	  = true;
			pos->has_build_id = true;
		}
	}

	return have_build_id;
}

void dsos__add(struct list_head *head, struct dso *dso)
{
	list_add_tail(&dso->node, head);
}

struct dso *dsos__find(struct list_head *head, const char *name)
{
	struct dso *pos;

	list_for_each_entry(pos, head, node)
		if (strcmp(pos->long_name, name) == 0)
			return pos;
	return NULL;
}

struct dso *__dsos__findnew(struct list_head *head, const char *name)
{
	struct dso *dso = dsos__find(head, name);

	if (!dso) {
		dso = dso__new(name);
		if (dso != NULL) {
			dsos__add(head, dso);
			dso__set_basename(dso);
		}
	}

	return dso;
}

size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
			       bool with_hits)
{
	struct dso *pos;
	size_t ret = 0;

	list_for_each_entry(pos, head, node) {
		if (with_hits && !pos->hit)
			continue;
		ret += dso__fprintf_buildid(pos, fp);
		ret += fprintf(fp, " %s\n", pos->long_name);
	}
	return ret;
}

size_t __dsos__fprintf(struct list_head *head, FILE *fp)
{
	struct dso *pos;
	size_t ret = 0;

	list_for_each_entry(pos, head, node) {
		int i;
		for (i = 0; i < MAP__NR_TYPES; ++i)
			ret += dso__fprintf(pos, i, fp);
	}

	return ret;
}

size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
{
	char sbuild_id[BUILD_ID_SIZE * 2 + 1];

	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
	return fprintf(fp, "%s", sbuild_id);
}

size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp)
{
	struct rb_node *nd;
	size_t ret = fprintf(fp, "dso: %s (", dso->short_name);

	if (dso->short_name != dso->long_name)
		ret += fprintf(fp, "%s, ", dso->long_name);
	ret += fprintf(fp, "%s, %sloaded, ", map_type__name[type],
		       dso__loaded(dso, type) ? "" : "NOT ");
	ret += dso__fprintf_buildid(dso, fp);
	ret += fprintf(fp, ")\n");
	for (nd = rb_first(&dso->symbols[type]); nd; nd = rb_next(nd)) {
		struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
		ret += symbol__fprintf(pos, fp);
	}

	return ret;
}
OpenPOWER on IntegriCloud