summaryrefslogtreecommitdiff
path: root/tools/perf/util/map.c
blob: 4d9944bbf5e47f52de2b6240a42fdb5bee8798cc (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
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
// SPDX-License-Identifier: GPL-2.0
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/string.h>
#include <linux/zalloc.h>
#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
#include "debug.h"
#include "dso.h"
#include "map.h"
#include "namespaces.h"
#include "srcline.h"
#include "symbol.h"
#include "thread.h"
#include "vdso.h"

static inline int is_android_lib(const char *filename)
{
	return strstarts(filename, "/data/app-lib/") ||
	       strstarts(filename, "/system/lib/");
}

static inline bool replace_android_lib(const char *filename, char *newfilename)
{
	const char *libname;
	char *app_abi;
	size_t app_abi_length, new_length;
	size_t lib_length = 0;

	libname  = strrchr(filename, '/');
	if (libname)
		lib_length = strlen(libname);

	app_abi = getenv("APP_ABI");
	if (!app_abi)
		return false;

	app_abi_length = strlen(app_abi);

	if (strstarts(filename, "/data/app-lib/")) {
		char *apk_path;

		if (!app_abi_length)
			return false;

		new_length = 7 + app_abi_length + lib_length;

		apk_path = getenv("APK_PATH");
		if (apk_path) {
			new_length += strlen(apk_path) + 1;
			if (new_length > PATH_MAX)
				return false;
			snprintf(newfilename, new_length,
				 "%s/libs/%s/%s", apk_path, app_abi, libname);
		} else {
			if (new_length > PATH_MAX)
				return false;
			snprintf(newfilename, new_length,
				 "libs/%s/%s", app_abi, libname);
		}
		return true;
	}

	if (strstarts(filename, "/system/lib/")) {
		char *ndk, *app;
		const char *arch;
		int ndk_length, app_length;

		ndk = getenv("NDK_ROOT");
		app = getenv("APP_PLATFORM");

		if (!(ndk && app))
			return false;

		ndk_length = strlen(ndk);
		app_length = strlen(app);

		if (!(ndk_length && app_length && app_abi_length))
			return false;

		arch = !strncmp(app_abi, "arm", 3) ? "arm" :
		       !strncmp(app_abi, "mips", 4) ? "mips" :
		       !strncmp(app_abi, "x86", 3) ? "x86" : NULL;

		if (!arch)
			return false;

		new_length = 27 + ndk_length +
			     app_length + lib_length
			   + strlen(arch);

		if (new_length > PATH_MAX)
			return false;
		snprintf(newfilename, new_length,
			"%.*s/platforms/%.*s/arch-%s/usr/lib/%s",
			ndk_length, ndk, app_length, app, arch, libname);

		return true;
	}
	return false;
}

void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
{
	map__set_start(map, start);
	map__set_end(map, end);
	map__set_pgoff(map, pgoff);
	map__set_reloc(map, 0);
	map__set_dso(map, dso__get(dso));
	map__set_map_ip(map, map__dso_map_ip);
	map__set_unmap_ip(map, map__dso_unmap_ip);
	map__set_erange_warned(map, false);
	refcount_set(map__refcnt(map), 1);
}

struct map *map__new(struct machine *machine, u64 start, u64 len,
		     u64 pgoff, struct dso_id *id,
		     u32 prot, u32 flags, struct build_id *bid,
		     char *filename, struct thread *thread)
{
	struct map *result;
	RC_STRUCT(map) *map;
	struct nsinfo *nsi = NULL;
	struct nsinfo *nnsi;

	map = malloc(sizeof(*map));
	if (ADD_RC_CHK(result, map)) {
		char newfilename[PATH_MAX];
		struct dso *dso, *header_bid_dso;
		int anon, no_dso, vdso, android;

		android = is_android_lib(filename);
		anon = is_anon_memory(filename) || flags & MAP_HUGETLB;
		vdso = is_vdso_map(filename);
		no_dso = is_no_dso_memory(filename);
		map->prot = prot;
		map->flags = flags;
		nsi = nsinfo__get(thread->nsinfo);

		if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {
			snprintf(newfilename, sizeof(newfilename),
				 "/tmp/perf-%d.map", nsinfo__pid(nsi));
			filename = newfilename;
		}

		if (android) {
			if (replace_android_lib(filename, newfilename))
				filename = newfilename;
		}

		if (vdso) {
			/* The vdso maps are always on the host and not the
			 * container.  Ensure that we don't use setns to look
			 * them up.
			 */
			nnsi = nsinfo__copy(nsi);
			if (nnsi) {
				nsinfo__put(nsi);
				nsinfo__clear_need_setns(nnsi);
				nsi = nnsi;
			}
			pgoff = 0;
			dso = machine__findnew_vdso(machine, thread);
		} else
			dso = machine__findnew_dso_id(machine, filename, id);

		if (dso == NULL)
			goto out_delete;

		map__init(result, start, start + len, pgoff, dso);

		if (anon || no_dso) {
			map->map_ip = map->unmap_ip = identity__map_ip;

			/*
			 * Set memory without DSO as loaded. All map__find_*
			 * functions still return NULL, and we avoid the
			 * unnecessary map__load warning.
			 */
			if (!(prot & PROT_EXEC))
				dso__set_loaded(dso);
		}
		mutex_lock(&dso->lock);
		nsinfo__put(dso->nsinfo);
		dso->nsinfo = nsi;
		mutex_unlock(&dso->lock);

		if (build_id__is_defined(bid)) {
			dso__set_build_id(dso, bid);
		} else {
			/*
			 * If the mmap event had no build ID, search for an existing dso from the
			 * build ID header by name. Otherwise only the dso loaded at the time of
			 * reading the header will have the build ID set and all future mmaps will
			 * have it missing.
			 */
			down_read(&machine->dsos.lock);
			header_bid_dso = __dsos__find(&machine->dsos, filename, false);
			up_read(&machine->dsos.lock);
			if (header_bid_dso && header_bid_dso->header_build_id) {
				dso__set_build_id(dso, &header_bid_dso->bid);
				dso->header_build_id = 1;
			}
		}
		dso__put(dso);
	}
	return result;
out_delete:
	nsinfo__put(nsi);
	RC_CHK_FREE(result);
	return NULL;
}

/*
 * Constructor variant for modules (where we know from /proc/modules where
 * they are loaded) and for vmlinux, where only after we load all the
 * symbols we'll know where it starts and ends.
 */
struct map *map__new2(u64 start, struct dso *dso)
{
	struct map *result;
	RC_STRUCT(map) *map;

	map = calloc(1, sizeof(*map) + (dso->kernel ? sizeof(struct kmap) : 0));
	if (ADD_RC_CHK(result, map)) {
		/*
		 * ->end will be filled after we load all the symbols
		 */
		map__init(result, start, 0, 0, dso);
	}

	return result;
}

bool __map__is_kernel(const struct map *map)
{
	if (!map__dso(map)->kernel)
		return false;
	return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map;
}

bool __map__is_extra_kernel_map(const struct map *map)
{
	struct kmap *kmap = __map__kmap((struct map *)map);

	return kmap && kmap->name[0];
}

bool __map__is_bpf_prog(const struct map *map)
{
	const char *name;
	struct dso *dso = map__dso(map);

	if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
		return true;

	/*
	 * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
	 * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
	 * guess the type based on name.
	 */
	name = dso->short_name;
	return name && (strstr(name, "bpf_prog_") == name);
}

bool __map__is_bpf_image(const struct map *map)
{
	const char *name;
	struct dso *dso = map__dso(map);

	if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
		return true;

	/*
	 * If PERF_RECORD_KSYMBOL is not included, the dso will not have
	 * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
	 * guess the type based on name.
	 */
	name = dso->short_name;
	return name && is_bpf_image(name);
}

bool __map__is_ool(const struct map *map)
{
	const struct dso *dso = map__dso(map);

	return dso && dso->binary_type == DSO_BINARY_TYPE__OOL;
}

bool map__has_symbols(const struct map *map)
{
	return dso__has_symbols(map__dso(map));
}

static void map__exit(struct map *map)
{
	BUG_ON(refcount_read(map__refcnt(map)) != 0);
	dso__zput(RC_CHK_ACCESS(map)->dso);
}

void map__delete(struct map *map)
{
	map__exit(map);
	RC_CHK_FREE(map);
}

void map__put(struct map *map)
{
	if (map && refcount_dec_and_test(map__refcnt(map)))
		map__delete(map);
	else
		RC_CHK_PUT(map);
}

void map__fixup_start(struct map *map)
{
	struct dso *dso = map__dso(map);
	struct rb_root_cached *symbols = &dso->symbols;
	struct rb_node *nd = rb_first_cached(symbols);

	if (nd != NULL) {
		struct symbol *sym = rb_entry(nd, struct symbol, rb_node);

		map__set_start(map, sym->start);
	}
}

void map__fixup_end(struct map *map)
{
	struct dso *dso = map__dso(map);
	struct rb_root_cached *symbols = &dso->symbols;
	struct rb_node *nd = rb_last(&symbols->rb_root);

	if (nd != NULL) {
		struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
		map__set_end(map, sym->end);
	}
}

#define DSO__DELETED "(deleted)"

int map__load(struct map *map)
{
	struct dso *dso = map__dso(map);
	const char *name = dso->long_name;
	int nr;

	if (dso__loaded(dso))
		return 0;

	nr = dso__load(dso, map);
	if (nr < 0) {
		if (dso->has_build_id) {
			char sbuild_id[SBUILD_ID_SIZE];

			build_id__sprintf(&dso->bid, sbuild_id);
			pr_debug("%s with build id %s not found", name, sbuild_id);
		} else
			pr_debug("Failed to open %s", name);

		pr_debug(", continuing without symbols\n");
		return -1;
	} else if (nr == 0) {
#ifdef HAVE_LIBELF_SUPPORT
		const size_t len = strlen(name);
		const size_t real_len = len - sizeof(DSO__DELETED);

		if (len > sizeof(DSO__DELETED) &&
		    strcmp(name + real_len + 1, DSO__DELETED) == 0) {
			pr_debug("%.*s was updated (is prelink enabled?). "
				"Restart the long running apps that use it!\n",
				   (int)real_len, name);
		} else {
			pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
		}
#endif
		return -1;
	}

	return 0;
}

struct symbol *map__find_symbol(struct map *map, u64 addr)
{
	if (map__load(map) < 0)
		return NULL;

	return dso__find_symbol(map__dso(map), addr);
}

struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
{
	struct dso *dso;

	if (map__load(map) < 0)
		return NULL;

	dso = map__dso(map);
	if (!dso__sorted_by_name(dso))
		dso__sort_by_name(dso);

	return dso__find_symbol_by_name(dso, name);
}

struct map *map__clone(struct map *from)
{
	struct map *result;
	RC_STRUCT(map) *map;
	size_t size = sizeof(RC_STRUCT(map));
	struct dso *dso = map__dso(from);

	if (dso && dso->kernel)
		size += sizeof(struct kmap);

	map = memdup(RC_CHK_ACCESS(from), size);
	if (ADD_RC_CHK(result, map)) {
		refcount_set(&map->refcnt, 1);
		map->dso = dso__get(dso);
	}

	return result;
}

size_t map__fprintf(struct map *map, FILE *fp)
{
	const struct dso *dso = map__dso(map);

	return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
		       map__start(map), map__end(map), map__pgoff(map), dso->name);
}

static bool prefer_dso_long_name(const struct dso *dso, bool print_off)
{
	return dso->long_name &&
	       (symbol_conf.show_kernel_path ||
		(print_off && (dso->name[0] == '[' || dso__is_kcore(dso))));
}

static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp)
{
	char buf[symbol_conf.pad_output_len_dso + 1];
	const char *dsoname = "[unknown]";
	const struct dso *dso = map ? map__dso(map) : NULL;

	if (dso) {
		if (prefer_dso_long_name(dso, print_off))
			dsoname = dso->long_name;
		else
			dsoname = dso->name;
	}

	if (symbol_conf.pad_output_len_dso) {
		scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
		dsoname = buf;
	}

	return fprintf(fp, "%s", dsoname);
}

size_t map__fprintf_dsoname(struct map *map, FILE *fp)
{
	return __map__fprintf_dsoname(map, false, fp);
}

size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp)
{
	const struct dso *dso = map ? map__dso(map) : NULL;
	int printed = 0;

	if (print_off && (!dso || !dso__is_object_file(dso)))
		print_off = false;
	printed += fprintf(fp, " (");
	printed += __map__fprintf_dsoname(map, print_off, fp);
	if (print_off)
		printed += fprintf(fp, "+0x%" PRIx64, addr);
	printed += fprintf(fp, ")");

	return printed;
}

char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
{
	if (map == NULL)
		return SRCLINE_UNKNOWN;

	return get_srcline(map__dso(map), map__rip_2objdump(map, addr), sym, true, true, addr);
}

int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
			 FILE *fp)
{
	const struct dso *dso = map ? map__dso(map) : NULL;
	int ret = 0;

	if (dso) {
		char *srcline = map__srcline(map, addr, NULL);
		if (strncmp(srcline, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)
			ret = fprintf(fp, "%s%s", prefix, srcline);
		free_srcline(srcline);
	}
	return ret;
}

void srccode_state_free(struct srccode_state *state)
{
	zfree(&state->srcfile);
	state->line = 0;
}

/**
 * map__rip_2objdump - convert symbol start address to objdump address.
 * @map: memory map
 * @rip: symbol start address
 *
 * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
 * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is
 * relative to section start.
 *
 * Return: Address suitable for passing to "objdump --start-address="
 */
u64 map__rip_2objdump(struct map *map, u64 rip)
{
	struct kmap *kmap = __map__kmap(map);
	const struct dso *dso = map__dso(map);

	/*
	 * vmlinux does not have program headers for PTI entry trampolines and
	 * kcore may not either. However the trampoline object code is on the
	 * main kernel map, so just use that instead.
	 */
	if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps) {
		struct machine *machine = maps__machine(kmap->kmaps);

		if (machine) {
			struct map *kernel_map = machine__kernel_map(machine);

			if (kernel_map)
				map = kernel_map;
		}
	}

	if (!dso->adjust_symbols)
		return rip;

	if (dso->rel)
		return rip - map__pgoff(map);

	/*
	 * kernel modules also have DSO_TYPE_USER in dso->kernel,
	 * but all kernel modules are ET_REL, so won't get here.
	 */
	if (dso->kernel == DSO_SPACE__USER)
		return rip + dso->text_offset;

	return map__unmap_ip(map, rip) - map__reloc(map);
}

/**
 * map__objdump_2mem - convert objdump address to a memory address.
 * @map: memory map
 * @ip: objdump address
 *
 * Closely related to map__rip_2objdump(), this function takes an address from
 * objdump and converts it to a memory address.  Note this assumes that @map
 * contains the address.  To be sure the result is valid, check it forwards
 * e.g. map__rip_2objdump(map__map_ip(map, map__objdump_2mem(map, ip))) == ip
 *
 * Return: Memory address.
 */
u64 map__objdump_2mem(struct map *map, u64 ip)
{
	const struct dso *dso = map__dso(map);

	if (!dso->adjust_symbols)
		return map__unmap_ip(map, ip);

	if (dso->rel)
		return map__unmap_ip(map, ip + map__pgoff(map));

	/*
	 * kernel modules also have DSO_TYPE_USER in dso->kernel,
	 * but all kernel modules are ET_REL, so won't get here.
	 */
	if (dso->kernel == DSO_SPACE__USER)
		return map__unmap_ip(map, ip - dso->text_offset);

	return ip + map__reloc(map);
}

bool map__contains_symbol(const struct map *map, const struct symbol *sym)
{
	u64 ip = map__unmap_ip(map, sym->start);

	return ip >= map__start(map) && ip < map__end(map);
}

struct kmap *__map__kmap(struct map *map)
{
	const struct dso *dso = map__dso(map);

	if (!dso || !dso->kernel)
		return NULL;
	return (struct kmap *)(&RC_CHK_ACCESS(map)[1]);
}

struct kmap *map__kmap(struct map *map)
{
	struct kmap *kmap = __map__kmap(map);

	if (!kmap)
		pr_err("Internal error: map__kmap with a non-kernel map\n");
	return kmap;
}

struct maps *map__kmaps(struct map *map)
{
	struct kmap *kmap = map__kmap(map);

	if (!kmap || !kmap->kmaps) {
		pr_err("Internal error: map__kmaps with a non-kernel map\n");
		return NULL;
	}
	return kmap->kmaps;
}

u64 map__dso_map_ip(const struct map *map, u64 ip)
{
	return ip - map__start(map) + map__pgoff(map);
}

u64 map__dso_unmap_ip(const struct map *map, u64 ip)
{
	return ip + map__start(map) - map__pgoff(map);
}

u64 identity__map_ip(const struct map *map __maybe_unused, u64 ip)
{
	return ip;
}