summaryrefslogtreecommitdiff
path: root/tools/perf/util/maps.c
blob: 37bd5b40000ddae82fe4a66e10b29f2e610ae0b5 (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
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <stdlib.h>
#include <linux/zalloc.h>
#include "debug.h"
#include "dso.h"
#include "map.h"
#include "maps.h"
#include "thread.h"
#include "ui/ui.h"
#include "unwind.h"

static void __maps__insert(struct maps *maps, struct map *map);

static void maps__init(struct maps *maps, struct machine *machine)
{
	maps->entries = RB_ROOT;
	init_rwsem(&maps->lock);
	maps->machine = machine;
	maps->last_search_by_name = NULL;
	maps->nr_maps = 0;
	maps->maps_by_name = NULL;
	refcount_set(&maps->refcnt, 1);
}

static void __maps__free_maps_by_name(struct maps *maps)
{
	/*
	 * Free everything to try to do it from the rbtree in the next search
	 */
	zfree(&maps->maps_by_name);
	maps->nr_maps_allocated = 0;
}

void maps__insert(struct maps *maps, struct map *map)
{
	down_write(&maps->lock);
	__maps__insert(maps, map);
	++maps->nr_maps;

	if (map->dso && map->dso->kernel) {
		struct kmap *kmap = map__kmap(map);

		if (kmap)
			kmap->kmaps = maps;
		else
			pr_err("Internal error: kernel dso with non kernel map\n");
	}


	/*
	 * If we already performed some search by name, then we need to add the just
	 * inserted map and resort.
	 */
	if (maps->maps_by_name) {
		if (maps->nr_maps > maps->nr_maps_allocated) {
			int nr_allocate = maps->nr_maps * 2;
			struct map **maps_by_name = realloc(maps->maps_by_name, nr_allocate * sizeof(map));

			if (maps_by_name == NULL) {
				__maps__free_maps_by_name(maps);
				up_write(&maps->lock);
				return;
			}

			maps->maps_by_name = maps_by_name;
			maps->nr_maps_allocated = nr_allocate;
		}
		maps->maps_by_name[maps->nr_maps - 1] = map;
		__maps__sort_by_name(maps);
	}
	up_write(&maps->lock);
}

static void __maps__remove(struct maps *maps, struct map *map)
{
	rb_erase_init(&map->rb_node, &maps->entries);
	map__put(map);
}

void maps__remove(struct maps *maps, struct map *map)
{
	down_write(&maps->lock);
	if (maps->last_search_by_name == map)
		maps->last_search_by_name = NULL;

	__maps__remove(maps, map);
	--maps->nr_maps;
	if (maps->maps_by_name)
		__maps__free_maps_by_name(maps);
	up_write(&maps->lock);
}

static void __maps__purge(struct maps *maps)
{
	struct map *pos, *next;

	maps__for_each_entry_safe(maps, pos, next) {
		rb_erase_init(&pos->rb_node,  &maps->entries);
		map__put(pos);
	}
}

static void maps__exit(struct maps *maps)
{
	down_write(&maps->lock);
	__maps__purge(maps);
	up_write(&maps->lock);
}

bool maps__empty(struct maps *maps)
{
	return !maps__first(maps);
}

struct maps *maps__new(struct machine *machine)
{
	struct maps *maps = zalloc(sizeof(*maps));

	if (maps != NULL)
		maps__init(maps, machine);

	return maps;
}

void maps__delete(struct maps *maps)
{
	maps__exit(maps);
	unwind__finish_access(maps);
	free(maps);
}

void maps__put(struct maps *maps)
{
	if (maps && refcount_dec_and_test(&maps->refcnt))
		maps__delete(maps);
}

struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
{
	struct map *map = maps__find(maps, addr);

	/* Ensure map is loaded before using map->map_ip */
	if (map != NULL && map__load(map) >= 0) {
		if (mapp != NULL)
			*mapp = map;
		return map__find_symbol(map, map->map_ip(map, addr));
	}

	return NULL;
}

struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name, struct map **mapp)
{
	struct symbol *sym;
	struct map *pos;

	down_read(&maps->lock);

	maps__for_each_entry(maps, pos) {
		sym = map__find_symbol_by_name(pos, name);

		if (sym == NULL)
			continue;
		if (!map__contains_symbol(pos, sym)) {
			sym = NULL;
			continue;
		}
		if (mapp != NULL)
			*mapp = pos;
		goto out;
	}

	sym = NULL;
out:
	up_read(&maps->lock);
	return sym;
}

int maps__find_ams(struct maps *maps, struct addr_map_symbol *ams)
{
	if (ams->addr < ams->ms.map->start || ams->addr >= ams->ms.map->end) {
		if (maps == NULL)
			return -1;
		ams->ms.map = maps__find(maps, ams->addr);
		if (ams->ms.map == NULL)
			return -1;
	}

	ams->al_addr = ams->ms.map->map_ip(ams->ms.map, ams->addr);
	ams->ms.sym = map__find_symbol(ams->ms.map, ams->al_addr);

	return ams->ms.sym ? 0 : -1;
}

size_t maps__fprintf(struct maps *maps, FILE *fp)
{
	size_t printed = 0;
	struct map *pos;

	down_read(&maps->lock);

	maps__for_each_entry(maps, pos) {
		printed += fprintf(fp, "Map:");
		printed += map__fprintf(pos, fp);
		if (verbose > 2) {
			printed += dso__fprintf(pos->dso, fp);
			printed += fprintf(fp, "--\n");
		}
	}

	up_read(&maps->lock);

	return printed;
}

int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
{
	struct rb_root *root;
	struct rb_node *next, *first;
	int err = 0;

	down_write(&maps->lock);

	root = &maps->entries;

	/*
	 * Find first map where end > map->start.
	 * Same as find_vma() in kernel.
	 */
	next = root->rb_node;
	first = NULL;
	while (next) {
		struct map *pos = rb_entry(next, struct map, rb_node);

		if (pos->end > map->start) {
			first = next;
			if (pos->start <= map->start)
				break;
			next = next->rb_left;
		} else
			next = next->rb_right;
	}

	next = first;
	while (next) {
		struct map *pos = rb_entry(next, struct map, rb_node);
		next = rb_next(&pos->rb_node);

		/*
		 * Stop if current map starts after map->end.
		 * Maps are ordered by start: next will not overlap for sure.
		 */
		if (pos->start >= map->end)
			break;

		if (verbose >= 2) {

			if (use_browser) {
				pr_debug("overlapping maps in %s (disable tui for more info)\n",
					   map->dso->name);
			} else {
				fputs("overlapping maps:\n", fp);
				map__fprintf(map, fp);
				map__fprintf(pos, fp);
			}
		}

		rb_erase_init(&pos->rb_node, root);
		/*
		 * Now check if we need to create new maps for areas not
		 * overlapped by the new map:
		 */
		if (map->start > pos->start) {
			struct map *before = map__clone(pos);

			if (before == NULL) {
				err = -ENOMEM;
				goto put_map;
			}

			before->end = map->start;
			__maps__insert(maps, before);
			if (verbose >= 2 && !use_browser)
				map__fprintf(before, fp);
			map__put(before);
		}

		if (map->end < pos->end) {
			struct map *after = map__clone(pos);

			if (after == NULL) {
				err = -ENOMEM;
				goto put_map;
			}

			after->start = map->end;
			after->pgoff += map->end - pos->start;
			assert(pos->map_ip(pos, map->end) == after->map_ip(after, map->end));
			__maps__insert(maps, after);
			if (verbose >= 2 && !use_browser)
				map__fprintf(after, fp);
			map__put(after);
		}
put_map:
		map__put(pos);

		if (err)
			goto out;
	}

	err = 0;
out:
	up_write(&maps->lock);
	return err;
}

/*
 * XXX This should not really _copy_ te maps, but refcount them.
 */
int maps__clone(struct thread *thread, struct maps *parent)
{
	struct maps *maps = thread->maps;
	int err;
	struct map *map;

	down_read(&parent->lock);

	maps__for_each_entry(parent, map) {
		struct map *new = map__clone(map);

		if (new == NULL) {
			err = -ENOMEM;
			goto out_unlock;
		}

		err = unwind__prepare_access(maps, new, NULL);
		if (err)
			goto out_unlock;

		maps__insert(maps, new);
		map__put(new);
	}

	err = 0;
out_unlock:
	up_read(&parent->lock);
	return err;
}

static void __maps__insert(struct maps *maps, struct map *map)
{
	struct rb_node **p = &maps->entries.rb_node;
	struct rb_node *parent = NULL;
	const u64 ip = map->start;
	struct map *m;

	while (*p != NULL) {
		parent = *p;
		m = rb_entry(parent, struct map, rb_node);
		if (ip < m->start)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	rb_link_node(&map->rb_node, parent, p);
	rb_insert_color(&map->rb_node, &maps->entries);
	map__get(map);
}

struct map *maps__find(struct maps *maps, u64 ip)
{
	struct rb_node *p;
	struct map *m;

	down_read(&maps->lock);

	p = maps->entries.rb_node;
	while (p != NULL) {
		m = rb_entry(p, struct map, rb_node);
		if (ip < m->start)
			p = p->rb_left;
		else if (ip >= m->end)
			p = p->rb_right;
		else
			goto out;
	}

	m = NULL;
out:
	up_read(&maps->lock);
	return m;
}

struct map *maps__first(struct maps *maps)
{
	struct rb_node *first = rb_first(&maps->entries);

	if (first)
		return rb_entry(first, struct map, rb_node);
	return NULL;
}