xref: /linux/tools/perf/util/symbol.c (revision ec63e2a4897075e427c121d863bd89c44578094f)
1 // SPDX-License-Identifier: GPL-2.0
2 #include <dirent.h>
3 #include <errno.h>
4 #include <stdlib.h>
5 #include <stdio.h>
6 #include <string.h>
7 #include <linux/kernel.h>
8 #include <linux/mman.h>
9 #include <linux/time64.h>
10 #include <sys/types.h>
11 #include <sys/stat.h>
12 #include <sys/param.h>
13 #include <fcntl.h>
14 #include <unistd.h>
15 #include <inttypes.h>
16 #include "annotate.h"
17 #include "build-id.h"
18 #include "util.h"
19 #include "debug.h"
20 #include "machine.h"
21 #include "map.h"
22 #include "symbol.h"
23 #include "strlist.h"
24 #include "intlist.h"
25 #include "namespaces.h"
26 #include "header.h"
27 #include "path.h"
28 #include "sane_ctype.h"
29 
30 #include <elf.h>
31 #include <limits.h>
32 #include <symbol/kallsyms.h>
33 #include <sys/utsname.h>
34 
35 static int dso__load_kernel_sym(struct dso *dso, struct map *map);
36 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
37 static bool symbol__is_idle(const char *name);
38 
39 int vmlinux_path__nr_entries;
40 char **vmlinux_path;
41 
42 struct symbol_conf symbol_conf = {
43 	.nanosecs		= false,
44 	.use_modules		= true,
45 	.try_vmlinux_path	= true,
46 	.demangle		= true,
47 	.demangle_kernel	= false,
48 	.cumulate_callchain	= true,
49 	.time_quantum		= 100 * NSEC_PER_MSEC, /* 100ms */
50 	.show_hist_headers	= true,
51 	.symfs			= "",
52 	.event_group		= true,
53 	.inline_name		= true,
54 	.res_sample		= 0,
55 };
56 
57 static enum dso_binary_type binary_type_symtab[] = {
58 	DSO_BINARY_TYPE__KALLSYMS,
59 	DSO_BINARY_TYPE__GUEST_KALLSYMS,
60 	DSO_BINARY_TYPE__JAVA_JIT,
61 	DSO_BINARY_TYPE__DEBUGLINK,
62 	DSO_BINARY_TYPE__BUILD_ID_CACHE,
63 	DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
64 	DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
65 	DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
66 	DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
67 	DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
68 	DSO_BINARY_TYPE__GUEST_KMODULE,
69 	DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
70 	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
71 	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
72 	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
73 	DSO_BINARY_TYPE__NOT_FOUND,
74 };
75 
76 #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
77 
78 static bool symbol_type__filter(char symbol_type)
79 {
80 	symbol_type = toupper(symbol_type);
81 	return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
82 }
83 
84 static int prefix_underscores_count(const char *str)
85 {
86 	const char *tail = str;
87 
88 	while (*tail == '_')
89 		tail++;
90 
91 	return tail - str;
92 }
93 
94 const char * __weak arch__normalize_symbol_name(const char *name)
95 {
96 	return name;
97 }
98 
99 int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
100 {
101 	return strcmp(namea, nameb);
102 }
103 
104 int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
105 					unsigned int n)
106 {
107 	return strncmp(namea, nameb, n);
108 }
109 
110 int __weak arch__choose_best_symbol(struct symbol *syma,
111 				    struct symbol *symb __maybe_unused)
112 {
113 	/* Avoid "SyS" kernel syscall aliases */
114 	if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
115 		return SYMBOL_B;
116 	if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
117 		return SYMBOL_B;
118 
119 	return SYMBOL_A;
120 }
121 
122 static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
123 {
124 	s64 a;
125 	s64 b;
126 	size_t na, nb;
127 
128 	/* Prefer a symbol with non zero length */
129 	a = syma->end - syma->start;
130 	b = symb->end - symb->start;
131 	if ((b == 0) && (a > 0))
132 		return SYMBOL_A;
133 	else if ((a == 0) && (b > 0))
134 		return SYMBOL_B;
135 
136 	/* Prefer a non weak symbol over a weak one */
137 	a = syma->binding == STB_WEAK;
138 	b = symb->binding == STB_WEAK;
139 	if (b && !a)
140 		return SYMBOL_A;
141 	if (a && !b)
142 		return SYMBOL_B;
143 
144 	/* Prefer a global symbol over a non global one */
145 	a = syma->binding == STB_GLOBAL;
146 	b = symb->binding == STB_GLOBAL;
147 	if (a && !b)
148 		return SYMBOL_A;
149 	if (b && !a)
150 		return SYMBOL_B;
151 
152 	/* Prefer a symbol with less underscores */
153 	a = prefix_underscores_count(syma->name);
154 	b = prefix_underscores_count(symb->name);
155 	if (b > a)
156 		return SYMBOL_A;
157 	else if (a > b)
158 		return SYMBOL_B;
159 
160 	/* Choose the symbol with the longest name */
161 	na = strlen(syma->name);
162 	nb = strlen(symb->name);
163 	if (na > nb)
164 		return SYMBOL_A;
165 	else if (na < nb)
166 		return SYMBOL_B;
167 
168 	return arch__choose_best_symbol(syma, symb);
169 }
170 
171 void symbols__fixup_duplicate(struct rb_root_cached *symbols)
172 {
173 	struct rb_node *nd;
174 	struct symbol *curr, *next;
175 
176 	if (symbol_conf.allow_aliases)
177 		return;
178 
179 	nd = rb_first_cached(symbols);
180 
181 	while (nd) {
182 		curr = rb_entry(nd, struct symbol, rb_node);
183 again:
184 		nd = rb_next(&curr->rb_node);
185 		next = rb_entry(nd, struct symbol, rb_node);
186 
187 		if (!nd)
188 			break;
189 
190 		if (curr->start != next->start)
191 			continue;
192 
193 		if (choose_best_symbol(curr, next) == SYMBOL_A) {
194 			rb_erase_cached(&next->rb_node, symbols);
195 			symbol__delete(next);
196 			goto again;
197 		} else {
198 			nd = rb_next(&curr->rb_node);
199 			rb_erase_cached(&curr->rb_node, symbols);
200 			symbol__delete(curr);
201 		}
202 	}
203 }
204 
205 void symbols__fixup_end(struct rb_root_cached *symbols)
206 {
207 	struct rb_node *nd, *prevnd = rb_first_cached(symbols);
208 	struct symbol *curr, *prev;
209 
210 	if (prevnd == NULL)
211 		return;
212 
213 	curr = rb_entry(prevnd, struct symbol, rb_node);
214 
215 	for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
216 		prev = curr;
217 		curr = rb_entry(nd, struct symbol, rb_node);
218 
219 		if (prev->end == prev->start && prev->end != curr->start)
220 			prev->end = curr->start;
221 	}
222 
223 	/* Last entry */
224 	if (curr->end == curr->start)
225 		curr->end = roundup(curr->start, 4096) + 4096;
226 }
227 
228 void map_groups__fixup_end(struct map_groups *mg)
229 {
230 	struct maps *maps = &mg->maps;
231 	struct map *next, *curr;
232 
233 	down_write(&maps->lock);
234 
235 	curr = maps__first(maps);
236 	if (curr == NULL)
237 		goto out_unlock;
238 
239 	for (next = map__next(curr); next; next = map__next(curr)) {
240 		if (!curr->end)
241 			curr->end = next->start;
242 		curr = next;
243 	}
244 
245 	/*
246 	 * We still haven't the actual symbols, so guess the
247 	 * last map final address.
248 	 */
249 	if (!curr->end)
250 		curr->end = ~0ULL;
251 
252 out_unlock:
253 	up_write(&maps->lock);
254 }
255 
256 struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
257 {
258 	size_t namelen = strlen(name) + 1;
259 	struct symbol *sym = calloc(1, (symbol_conf.priv_size +
260 					sizeof(*sym) + namelen));
261 	if (sym == NULL)
262 		return NULL;
263 
264 	if (symbol_conf.priv_size) {
265 		if (symbol_conf.init_annotation) {
266 			struct annotation *notes = (void *)sym;
267 			pthread_mutex_init(&notes->lock, NULL);
268 		}
269 		sym = ((void *)sym) + symbol_conf.priv_size;
270 	}
271 
272 	sym->start   = start;
273 	sym->end     = len ? start + len : start;
274 	sym->type    = type;
275 	sym->binding = binding;
276 	sym->namelen = namelen - 1;
277 
278 	pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
279 		  __func__, name, start, sym->end);
280 	memcpy(sym->name, name, namelen);
281 
282 	return sym;
283 }
284 
285 void symbol__delete(struct symbol *sym)
286 {
287 	free(((void *)sym) - symbol_conf.priv_size);
288 }
289 
290 void symbols__delete(struct rb_root_cached *symbols)
291 {
292 	struct symbol *pos;
293 	struct rb_node *next = rb_first_cached(symbols);
294 
295 	while (next) {
296 		pos = rb_entry(next, struct symbol, rb_node);
297 		next = rb_next(&pos->rb_node);
298 		rb_erase_cached(&pos->rb_node, symbols);
299 		symbol__delete(pos);
300 	}
301 }
302 
303 void __symbols__insert(struct rb_root_cached *symbols,
304 		       struct symbol *sym, bool kernel)
305 {
306 	struct rb_node **p = &symbols->rb_root.rb_node;
307 	struct rb_node *parent = NULL;
308 	const u64 ip = sym->start;
309 	struct symbol *s;
310 	bool leftmost = true;
311 
312 	if (kernel) {
313 		const char *name = sym->name;
314 		/*
315 		 * ppc64 uses function descriptors and appends a '.' to the
316 		 * start of every instruction address. Remove it.
317 		 */
318 		if (name[0] == '.')
319 			name++;
320 		sym->idle = symbol__is_idle(name);
321 	}
322 
323 	while (*p != NULL) {
324 		parent = *p;
325 		s = rb_entry(parent, struct symbol, rb_node);
326 		if (ip < s->start)
327 			p = &(*p)->rb_left;
328 		else {
329 			p = &(*p)->rb_right;
330 			leftmost = false;
331 		}
332 	}
333 	rb_link_node(&sym->rb_node, parent, p);
334 	rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
335 }
336 
337 void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
338 {
339 	__symbols__insert(symbols, sym, false);
340 }
341 
342 static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
343 {
344 	struct rb_node *n;
345 
346 	if (symbols == NULL)
347 		return NULL;
348 
349 	n = symbols->rb_root.rb_node;
350 
351 	while (n) {
352 		struct symbol *s = rb_entry(n, struct symbol, rb_node);
353 
354 		if (ip < s->start)
355 			n = n->rb_left;
356 		else if (ip > s->end || (ip == s->end && ip != s->start))
357 			n = n->rb_right;
358 		else
359 			return s;
360 	}
361 
362 	return NULL;
363 }
364 
365 static struct symbol *symbols__first(struct rb_root_cached *symbols)
366 {
367 	struct rb_node *n = rb_first_cached(symbols);
368 
369 	if (n)
370 		return rb_entry(n, struct symbol, rb_node);
371 
372 	return NULL;
373 }
374 
375 static struct symbol *symbols__last(struct rb_root_cached *symbols)
376 {
377 	struct rb_node *n = rb_last(&symbols->rb_root);
378 
379 	if (n)
380 		return rb_entry(n, struct symbol, rb_node);
381 
382 	return NULL;
383 }
384 
385 static struct symbol *symbols__next(struct symbol *sym)
386 {
387 	struct rb_node *n = rb_next(&sym->rb_node);
388 
389 	if (n)
390 		return rb_entry(n, struct symbol, rb_node);
391 
392 	return NULL;
393 }
394 
395 static void symbols__insert_by_name(struct rb_root_cached *symbols, struct symbol *sym)
396 {
397 	struct rb_node **p = &symbols->rb_root.rb_node;
398 	struct rb_node *parent = NULL;
399 	struct symbol_name_rb_node *symn, *s;
400 	bool leftmost = true;
401 
402 	symn = container_of(sym, struct symbol_name_rb_node, sym);
403 
404 	while (*p != NULL) {
405 		parent = *p;
406 		s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
407 		if (strcmp(sym->name, s->sym.name) < 0)
408 			p = &(*p)->rb_left;
409 		else {
410 			p = &(*p)->rb_right;
411 			leftmost = false;
412 		}
413 	}
414 	rb_link_node(&symn->rb_node, parent, p);
415 	rb_insert_color_cached(&symn->rb_node, symbols, leftmost);
416 }
417 
418 static void symbols__sort_by_name(struct rb_root_cached *symbols,
419 				  struct rb_root_cached *source)
420 {
421 	struct rb_node *nd;
422 
423 	for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
424 		struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
425 		symbols__insert_by_name(symbols, pos);
426 	}
427 }
428 
429 int symbol__match_symbol_name(const char *name, const char *str,
430 			      enum symbol_tag_include includes)
431 {
432 	const char *versioning;
433 
434 	if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
435 	    (versioning = strstr(name, "@@"))) {
436 		int len = strlen(str);
437 
438 		if (len < versioning - name)
439 			len = versioning - name;
440 
441 		return arch__compare_symbol_names_n(name, str, len);
442 	} else
443 		return arch__compare_symbol_names(name, str);
444 }
445 
446 static struct symbol *symbols__find_by_name(struct rb_root_cached *symbols,
447 					    const char *name,
448 					    enum symbol_tag_include includes)
449 {
450 	struct rb_node *n;
451 	struct symbol_name_rb_node *s = NULL;
452 
453 	if (symbols == NULL)
454 		return NULL;
455 
456 	n = symbols->rb_root.rb_node;
457 
458 	while (n) {
459 		int cmp;
460 
461 		s = rb_entry(n, struct symbol_name_rb_node, rb_node);
462 		cmp = symbol__match_symbol_name(s->sym.name, name, includes);
463 
464 		if (cmp > 0)
465 			n = n->rb_left;
466 		else if (cmp < 0)
467 			n = n->rb_right;
468 		else
469 			break;
470 	}
471 
472 	if (n == NULL)
473 		return NULL;
474 
475 	if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY)
476 		/* return first symbol that has same name (if any) */
477 		for (n = rb_prev(n); n; n = rb_prev(n)) {
478 			struct symbol_name_rb_node *tmp;
479 
480 			tmp = rb_entry(n, struct symbol_name_rb_node, rb_node);
481 			if (arch__compare_symbol_names(tmp->sym.name, s->sym.name))
482 				break;
483 
484 			s = tmp;
485 		}
486 
487 	return &s->sym;
488 }
489 
490 void dso__reset_find_symbol_cache(struct dso *dso)
491 {
492 	dso->last_find_result.addr   = 0;
493 	dso->last_find_result.symbol = NULL;
494 }
495 
496 void dso__insert_symbol(struct dso *dso, struct symbol *sym)
497 {
498 	__symbols__insert(&dso->symbols, sym, dso->kernel);
499 
500 	/* update the symbol cache if necessary */
501 	if (dso->last_find_result.addr >= sym->start &&
502 	    (dso->last_find_result.addr < sym->end ||
503 	    sym->start == sym->end)) {
504 		dso->last_find_result.symbol = sym;
505 	}
506 }
507 
508 struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
509 {
510 	if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
511 		dso->last_find_result.addr   = addr;
512 		dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
513 	}
514 
515 	return dso->last_find_result.symbol;
516 }
517 
518 struct symbol *dso__first_symbol(struct dso *dso)
519 {
520 	return symbols__first(&dso->symbols);
521 }
522 
523 struct symbol *dso__last_symbol(struct dso *dso)
524 {
525 	return symbols__last(&dso->symbols);
526 }
527 
528 struct symbol *dso__next_symbol(struct symbol *sym)
529 {
530 	return symbols__next(sym);
531 }
532 
533 struct symbol *symbol__next_by_name(struct symbol *sym)
534 {
535 	struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym);
536 	struct rb_node *n = rb_next(&s->rb_node);
537 
538 	return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL;
539 }
540 
541  /*
542   * Returns first symbol that matched with @name.
543   */
544 struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name)
545 {
546 	struct symbol *s = symbols__find_by_name(&dso->symbol_names, name,
547 						 SYMBOL_TAG_INCLUDE__NONE);
548 	if (!s)
549 		s = symbols__find_by_name(&dso->symbol_names, name,
550 					  SYMBOL_TAG_INCLUDE__DEFAULT_ONLY);
551 	return s;
552 }
553 
554 void dso__sort_by_name(struct dso *dso)
555 {
556 	dso__set_sorted_by_name(dso);
557 	return symbols__sort_by_name(&dso->symbol_names, &dso->symbols);
558 }
559 
560 int modules__parse(const char *filename, void *arg,
561 		   int (*process_module)(void *arg, const char *name,
562 					 u64 start, u64 size))
563 {
564 	char *line = NULL;
565 	size_t n;
566 	FILE *file;
567 	int err = 0;
568 
569 	file = fopen(filename, "r");
570 	if (file == NULL)
571 		return -1;
572 
573 	while (1) {
574 		char name[PATH_MAX];
575 		u64 start, size;
576 		char *sep, *endptr;
577 		ssize_t line_len;
578 
579 		line_len = getline(&line, &n, file);
580 		if (line_len < 0) {
581 			if (feof(file))
582 				break;
583 			err = -1;
584 			goto out;
585 		}
586 
587 		if (!line) {
588 			err = -1;
589 			goto out;
590 		}
591 
592 		line[--line_len] = '\0'; /* \n */
593 
594 		sep = strrchr(line, 'x');
595 		if (sep == NULL)
596 			continue;
597 
598 		hex2u64(sep + 1, &start);
599 
600 		sep = strchr(line, ' ');
601 		if (sep == NULL)
602 			continue;
603 
604 		*sep = '\0';
605 
606 		scnprintf(name, sizeof(name), "[%s]", line);
607 
608 		size = strtoul(sep + 1, &endptr, 0);
609 		if (*endptr != ' ' && *endptr != '\t')
610 			continue;
611 
612 		err = process_module(arg, name, start, size);
613 		if (err)
614 			break;
615 	}
616 out:
617 	free(line);
618 	fclose(file);
619 	return err;
620 }
621 
622 /*
623  * These are symbols in the kernel image, so make sure that
624  * sym is from a kernel DSO.
625  */
626 static bool symbol__is_idle(const char *name)
627 {
628 	const char * const idle_symbols[] = {
629 		"arch_cpu_idle",
630 		"cpu_idle",
631 		"cpu_startup_entry",
632 		"intel_idle",
633 		"default_idle",
634 		"native_safe_halt",
635 		"enter_idle",
636 		"exit_idle",
637 		"mwait_idle",
638 		"mwait_idle_with_hints",
639 		"poll_idle",
640 		"ppc64_runlatch_off",
641 		"pseries_dedicated_idle_sleep",
642 		NULL
643 	};
644 	int i;
645 
646 	for (i = 0; idle_symbols[i]; i++) {
647 		if (!strcmp(idle_symbols[i], name))
648 			return true;
649 	}
650 
651 	return false;
652 }
653 
654 static int map__process_kallsym_symbol(void *arg, const char *name,
655 				       char type, u64 start)
656 {
657 	struct symbol *sym;
658 	struct dso *dso = arg;
659 	struct rb_root_cached *root = &dso->symbols;
660 
661 	if (!symbol_type__filter(type))
662 		return 0;
663 
664 	/*
665 	 * module symbols are not sorted so we add all
666 	 * symbols, setting length to 0, and rely on
667 	 * symbols__fixup_end() to fix it up.
668 	 */
669 	sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
670 	if (sym == NULL)
671 		return -ENOMEM;
672 	/*
673 	 * We will pass the symbols to the filter later, in
674 	 * map__split_kallsyms, when we have split the maps per module
675 	 */
676 	__symbols__insert(root, sym, !strchr(name, '['));
677 
678 	return 0;
679 }
680 
681 /*
682  * Loads the function entries in /proc/kallsyms into kernel_map->dso,
683  * so that we can in the next step set the symbol ->end address and then
684  * call kernel_maps__split_kallsyms.
685  */
686 static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
687 {
688 	return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
689 }
690 
691 static int map_groups__split_kallsyms_for_kcore(struct map_groups *kmaps, struct dso *dso)
692 {
693 	struct map *curr_map;
694 	struct symbol *pos;
695 	int count = 0;
696 	struct rb_root_cached old_root = dso->symbols;
697 	struct rb_root_cached *root = &dso->symbols;
698 	struct rb_node *next = rb_first_cached(root);
699 
700 	if (!kmaps)
701 		return -1;
702 
703 	*root = RB_ROOT_CACHED;
704 
705 	while (next) {
706 		char *module;
707 
708 		pos = rb_entry(next, struct symbol, rb_node);
709 		next = rb_next(&pos->rb_node);
710 
711 		rb_erase_cached(&pos->rb_node, &old_root);
712 		RB_CLEAR_NODE(&pos->rb_node);
713 		module = strchr(pos->name, '\t');
714 		if (module)
715 			*module = '\0';
716 
717 		curr_map = map_groups__find(kmaps, pos->start);
718 
719 		if (!curr_map) {
720 			symbol__delete(pos);
721 			continue;
722 		}
723 
724 		pos->start -= curr_map->start - curr_map->pgoff;
725 		if (pos->end > curr_map->end)
726 			pos->end = curr_map->end;
727 		if (pos->end)
728 			pos->end -= curr_map->start - curr_map->pgoff;
729 		symbols__insert(&curr_map->dso->symbols, pos);
730 		++count;
731 	}
732 
733 	/* Symbols have been adjusted */
734 	dso->adjust_symbols = 1;
735 
736 	return count;
737 }
738 
739 /*
740  * Split the symbols into maps, making sure there are no overlaps, i.e. the
741  * kernel range is broken in several maps, named [kernel].N, as we don't have
742  * the original ELF section names vmlinux have.
743  */
744 static int map_groups__split_kallsyms(struct map_groups *kmaps, struct dso *dso, u64 delta,
745 				      struct map *initial_map)
746 {
747 	struct machine *machine;
748 	struct map *curr_map = initial_map;
749 	struct symbol *pos;
750 	int count = 0, moved = 0;
751 	struct rb_root_cached *root = &dso->symbols;
752 	struct rb_node *next = rb_first_cached(root);
753 	int kernel_range = 0;
754 	bool x86_64;
755 
756 	if (!kmaps)
757 		return -1;
758 
759 	machine = kmaps->machine;
760 
761 	x86_64 = machine__is(machine, "x86_64");
762 
763 	while (next) {
764 		char *module;
765 
766 		pos = rb_entry(next, struct symbol, rb_node);
767 		next = rb_next(&pos->rb_node);
768 
769 		module = strchr(pos->name, '\t');
770 		if (module) {
771 			if (!symbol_conf.use_modules)
772 				goto discard_symbol;
773 
774 			*module++ = '\0';
775 
776 			if (strcmp(curr_map->dso->short_name, module)) {
777 				if (curr_map != initial_map &&
778 				    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
779 				    machine__is_default_guest(machine)) {
780 					/*
781 					 * We assume all symbols of a module are
782 					 * continuous in * kallsyms, so curr_map
783 					 * points to a module and all its
784 					 * symbols are in its kmap. Mark it as
785 					 * loaded.
786 					 */
787 					dso__set_loaded(curr_map->dso);
788 				}
789 
790 				curr_map = map_groups__find_by_name(kmaps, module);
791 				if (curr_map == NULL) {
792 					pr_debug("%s/proc/{kallsyms,modules} "
793 					         "inconsistency while looking "
794 						 "for \"%s\" module!\n",
795 						 machine->root_dir, module);
796 					curr_map = initial_map;
797 					goto discard_symbol;
798 				}
799 
800 				if (curr_map->dso->loaded &&
801 				    !machine__is_default_guest(machine))
802 					goto discard_symbol;
803 			}
804 			/*
805 			 * So that we look just like we get from .ko files,
806 			 * i.e. not prelinked, relative to initial_map->start.
807 			 */
808 			pos->start = curr_map->map_ip(curr_map, pos->start);
809 			pos->end   = curr_map->map_ip(curr_map, pos->end);
810 		} else if (x86_64 && is_entry_trampoline(pos->name)) {
811 			/*
812 			 * These symbols are not needed anymore since the
813 			 * trampoline maps refer to the text section and it's
814 			 * symbols instead. Avoid having to deal with
815 			 * relocations, and the assumption that the first symbol
816 			 * is the start of kernel text, by simply removing the
817 			 * symbols at this point.
818 			 */
819 			goto discard_symbol;
820 		} else if (curr_map != initial_map) {
821 			char dso_name[PATH_MAX];
822 			struct dso *ndso;
823 
824 			if (delta) {
825 				/* Kernel was relocated at boot time */
826 				pos->start -= delta;
827 				pos->end -= delta;
828 			}
829 
830 			if (count == 0) {
831 				curr_map = initial_map;
832 				goto add_symbol;
833 			}
834 
835 			if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
836 				snprintf(dso_name, sizeof(dso_name),
837 					"[guest.kernel].%d",
838 					kernel_range++);
839 			else
840 				snprintf(dso_name, sizeof(dso_name),
841 					"[kernel].%d",
842 					kernel_range++);
843 
844 			ndso = dso__new(dso_name);
845 			if (ndso == NULL)
846 				return -1;
847 
848 			ndso->kernel = dso->kernel;
849 
850 			curr_map = map__new2(pos->start, ndso);
851 			if (curr_map == NULL) {
852 				dso__put(ndso);
853 				return -1;
854 			}
855 
856 			curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
857 			map_groups__insert(kmaps, curr_map);
858 			++kernel_range;
859 		} else if (delta) {
860 			/* Kernel was relocated at boot time */
861 			pos->start -= delta;
862 			pos->end -= delta;
863 		}
864 add_symbol:
865 		if (curr_map != initial_map) {
866 			rb_erase_cached(&pos->rb_node, root);
867 			symbols__insert(&curr_map->dso->symbols, pos);
868 			++moved;
869 		} else
870 			++count;
871 
872 		continue;
873 discard_symbol:
874 		rb_erase_cached(&pos->rb_node, root);
875 		symbol__delete(pos);
876 	}
877 
878 	if (curr_map != initial_map &&
879 	    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
880 	    machine__is_default_guest(kmaps->machine)) {
881 		dso__set_loaded(curr_map->dso);
882 	}
883 
884 	return count + moved;
885 }
886 
887 bool symbol__restricted_filename(const char *filename,
888 				 const char *restricted_filename)
889 {
890 	bool restricted = false;
891 
892 	if (symbol_conf.kptr_restrict) {
893 		char *r = realpath(filename, NULL);
894 
895 		if (r != NULL) {
896 			restricted = strcmp(r, restricted_filename) == 0;
897 			free(r);
898 			return restricted;
899 		}
900 	}
901 
902 	return restricted;
903 }
904 
905 struct module_info {
906 	struct rb_node rb_node;
907 	char *name;
908 	u64 start;
909 };
910 
911 static void add_module(struct module_info *mi, struct rb_root *modules)
912 {
913 	struct rb_node **p = &modules->rb_node;
914 	struct rb_node *parent = NULL;
915 	struct module_info *m;
916 
917 	while (*p != NULL) {
918 		parent = *p;
919 		m = rb_entry(parent, struct module_info, rb_node);
920 		if (strcmp(mi->name, m->name) < 0)
921 			p = &(*p)->rb_left;
922 		else
923 			p = &(*p)->rb_right;
924 	}
925 	rb_link_node(&mi->rb_node, parent, p);
926 	rb_insert_color(&mi->rb_node, modules);
927 }
928 
929 static void delete_modules(struct rb_root *modules)
930 {
931 	struct module_info *mi;
932 	struct rb_node *next = rb_first(modules);
933 
934 	while (next) {
935 		mi = rb_entry(next, struct module_info, rb_node);
936 		next = rb_next(&mi->rb_node);
937 		rb_erase(&mi->rb_node, modules);
938 		zfree(&mi->name);
939 		free(mi);
940 	}
941 }
942 
943 static struct module_info *find_module(const char *name,
944 				       struct rb_root *modules)
945 {
946 	struct rb_node *n = modules->rb_node;
947 
948 	while (n) {
949 		struct module_info *m;
950 		int cmp;
951 
952 		m = rb_entry(n, struct module_info, rb_node);
953 		cmp = strcmp(name, m->name);
954 		if (cmp < 0)
955 			n = n->rb_left;
956 		else if (cmp > 0)
957 			n = n->rb_right;
958 		else
959 			return m;
960 	}
961 
962 	return NULL;
963 }
964 
965 static int __read_proc_modules(void *arg, const char *name, u64 start,
966 			       u64 size __maybe_unused)
967 {
968 	struct rb_root *modules = arg;
969 	struct module_info *mi;
970 
971 	mi = zalloc(sizeof(struct module_info));
972 	if (!mi)
973 		return -ENOMEM;
974 
975 	mi->name = strdup(name);
976 	mi->start = start;
977 
978 	if (!mi->name) {
979 		free(mi);
980 		return -ENOMEM;
981 	}
982 
983 	add_module(mi, modules);
984 
985 	return 0;
986 }
987 
988 static int read_proc_modules(const char *filename, struct rb_root *modules)
989 {
990 	if (symbol__restricted_filename(filename, "/proc/modules"))
991 		return -1;
992 
993 	if (modules__parse(filename, modules, __read_proc_modules)) {
994 		delete_modules(modules);
995 		return -1;
996 	}
997 
998 	return 0;
999 }
1000 
1001 int compare_proc_modules(const char *from, const char *to)
1002 {
1003 	struct rb_root from_modules = RB_ROOT;
1004 	struct rb_root to_modules = RB_ROOT;
1005 	struct rb_node *from_node, *to_node;
1006 	struct module_info *from_m, *to_m;
1007 	int ret = -1;
1008 
1009 	if (read_proc_modules(from, &from_modules))
1010 		return -1;
1011 
1012 	if (read_proc_modules(to, &to_modules))
1013 		goto out_delete_from;
1014 
1015 	from_node = rb_first(&from_modules);
1016 	to_node = rb_first(&to_modules);
1017 	while (from_node) {
1018 		if (!to_node)
1019 			break;
1020 
1021 		from_m = rb_entry(from_node, struct module_info, rb_node);
1022 		to_m = rb_entry(to_node, struct module_info, rb_node);
1023 
1024 		if (from_m->start != to_m->start ||
1025 		    strcmp(from_m->name, to_m->name))
1026 			break;
1027 
1028 		from_node = rb_next(from_node);
1029 		to_node = rb_next(to_node);
1030 	}
1031 
1032 	if (!from_node && !to_node)
1033 		ret = 0;
1034 
1035 	delete_modules(&to_modules);
1036 out_delete_from:
1037 	delete_modules(&from_modules);
1038 
1039 	return ret;
1040 }
1041 
1042 struct map *map_groups__first(struct map_groups *mg)
1043 {
1044 	return maps__first(&mg->maps);
1045 }
1046 
1047 static int do_validate_kcore_modules(const char *filename,
1048 				  struct map_groups *kmaps)
1049 {
1050 	struct rb_root modules = RB_ROOT;
1051 	struct map *old_map;
1052 	int err;
1053 
1054 	err = read_proc_modules(filename, &modules);
1055 	if (err)
1056 		return err;
1057 
1058 	old_map = map_groups__first(kmaps);
1059 	while (old_map) {
1060 		struct map *next = map_groups__next(old_map);
1061 		struct module_info *mi;
1062 
1063 		if (!__map__is_kmodule(old_map)) {
1064 			old_map = next;
1065 			continue;
1066 		}
1067 
1068 		/* Module must be in memory at the same address */
1069 		mi = find_module(old_map->dso->short_name, &modules);
1070 		if (!mi || mi->start != old_map->start) {
1071 			err = -EINVAL;
1072 			goto out;
1073 		}
1074 
1075 		old_map = next;
1076 	}
1077 out:
1078 	delete_modules(&modules);
1079 	return err;
1080 }
1081 
1082 /*
1083  * If kallsyms is referenced by name then we look for filename in the same
1084  * directory.
1085  */
1086 static bool filename_from_kallsyms_filename(char *filename,
1087 					    const char *base_name,
1088 					    const char *kallsyms_filename)
1089 {
1090 	char *name;
1091 
1092 	strcpy(filename, kallsyms_filename);
1093 	name = strrchr(filename, '/');
1094 	if (!name)
1095 		return false;
1096 
1097 	name += 1;
1098 
1099 	if (!strcmp(name, "kallsyms")) {
1100 		strcpy(name, base_name);
1101 		return true;
1102 	}
1103 
1104 	return false;
1105 }
1106 
1107 static int validate_kcore_modules(const char *kallsyms_filename,
1108 				  struct map *map)
1109 {
1110 	struct map_groups *kmaps = map__kmaps(map);
1111 	char modules_filename[PATH_MAX];
1112 
1113 	if (!kmaps)
1114 		return -EINVAL;
1115 
1116 	if (!filename_from_kallsyms_filename(modules_filename, "modules",
1117 					     kallsyms_filename))
1118 		return -EINVAL;
1119 
1120 	if (do_validate_kcore_modules(modules_filename, kmaps))
1121 		return -EINVAL;
1122 
1123 	return 0;
1124 }
1125 
1126 static int validate_kcore_addresses(const char *kallsyms_filename,
1127 				    struct map *map)
1128 {
1129 	struct kmap *kmap = map__kmap(map);
1130 
1131 	if (!kmap)
1132 		return -EINVAL;
1133 
1134 	if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1135 		u64 start;
1136 
1137 		if (kallsyms__get_function_start(kallsyms_filename,
1138 						 kmap->ref_reloc_sym->name, &start))
1139 			return -ENOENT;
1140 		if (start != kmap->ref_reloc_sym->addr)
1141 			return -EINVAL;
1142 	}
1143 
1144 	return validate_kcore_modules(kallsyms_filename, map);
1145 }
1146 
1147 struct kcore_mapfn_data {
1148 	struct dso *dso;
1149 	struct list_head maps;
1150 };
1151 
1152 static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1153 {
1154 	struct kcore_mapfn_data *md = data;
1155 	struct map *map;
1156 
1157 	map = map__new2(start, md->dso);
1158 	if (map == NULL)
1159 		return -ENOMEM;
1160 
1161 	map->end = map->start + len;
1162 	map->pgoff = pgoff;
1163 
1164 	list_add(&map->node, &md->maps);
1165 
1166 	return 0;
1167 }
1168 
1169 static int dso__load_kcore(struct dso *dso, struct map *map,
1170 			   const char *kallsyms_filename)
1171 {
1172 	struct map_groups *kmaps = map__kmaps(map);
1173 	struct kcore_mapfn_data md;
1174 	struct map *old_map, *new_map, *replacement_map = NULL;
1175 	struct machine *machine;
1176 	bool is_64_bit;
1177 	int err, fd;
1178 	char kcore_filename[PATH_MAX];
1179 	u64 stext;
1180 
1181 	if (!kmaps)
1182 		return -EINVAL;
1183 
1184 	machine = kmaps->machine;
1185 
1186 	/* This function requires that the map is the kernel map */
1187 	if (!__map__is_kernel(map))
1188 		return -EINVAL;
1189 
1190 	if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1191 					     kallsyms_filename))
1192 		return -EINVAL;
1193 
1194 	/* Modules and kernel must be present at their original addresses */
1195 	if (validate_kcore_addresses(kallsyms_filename, map))
1196 		return -EINVAL;
1197 
1198 	md.dso = dso;
1199 	INIT_LIST_HEAD(&md.maps);
1200 
1201 	fd = open(kcore_filename, O_RDONLY);
1202 	if (fd < 0) {
1203 		pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1204 			 kcore_filename);
1205 		return -EINVAL;
1206 	}
1207 
1208 	/* Read new maps into temporary lists */
1209 	err = file__read_maps(fd, map->prot & PROT_EXEC, kcore_mapfn, &md,
1210 			      &is_64_bit);
1211 	if (err)
1212 		goto out_err;
1213 	dso->is_64_bit = is_64_bit;
1214 
1215 	if (list_empty(&md.maps)) {
1216 		err = -EINVAL;
1217 		goto out_err;
1218 	}
1219 
1220 	/* Remove old maps */
1221 	old_map = map_groups__first(kmaps);
1222 	while (old_map) {
1223 		struct map *next = map_groups__next(old_map);
1224 
1225 		if (old_map != map)
1226 			map_groups__remove(kmaps, old_map);
1227 		old_map = next;
1228 	}
1229 	machine->trampolines_mapped = false;
1230 
1231 	/* Find the kernel map using the '_stext' symbol */
1232 	if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1233 		list_for_each_entry(new_map, &md.maps, node) {
1234 			if (stext >= new_map->start && stext < new_map->end) {
1235 				replacement_map = new_map;
1236 				break;
1237 			}
1238 		}
1239 	}
1240 
1241 	if (!replacement_map)
1242 		replacement_map = list_entry(md.maps.next, struct map, node);
1243 
1244 	/* Add new maps */
1245 	while (!list_empty(&md.maps)) {
1246 		new_map = list_entry(md.maps.next, struct map, node);
1247 		list_del_init(&new_map->node);
1248 		if (new_map == replacement_map) {
1249 			map->start	= new_map->start;
1250 			map->end	= new_map->end;
1251 			map->pgoff	= new_map->pgoff;
1252 			map->map_ip	= new_map->map_ip;
1253 			map->unmap_ip	= new_map->unmap_ip;
1254 			/* Ensure maps are correctly ordered */
1255 			map__get(map);
1256 			map_groups__remove(kmaps, map);
1257 			map_groups__insert(kmaps, map);
1258 			map__put(map);
1259 		} else {
1260 			map_groups__insert(kmaps, new_map);
1261 		}
1262 
1263 		map__put(new_map);
1264 	}
1265 
1266 	if (machine__is(machine, "x86_64")) {
1267 		u64 addr;
1268 
1269 		/*
1270 		 * If one of the corresponding symbols is there, assume the
1271 		 * entry trampoline maps are too.
1272 		 */
1273 		if (!kallsyms__get_function_start(kallsyms_filename,
1274 						  ENTRY_TRAMPOLINE_NAME,
1275 						  &addr))
1276 			machine->trampolines_mapped = true;
1277 	}
1278 
1279 	/*
1280 	 * Set the data type and long name so that kcore can be read via
1281 	 * dso__data_read_addr().
1282 	 */
1283 	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1284 		dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1285 	else
1286 		dso->binary_type = DSO_BINARY_TYPE__KCORE;
1287 	dso__set_long_name(dso, strdup(kcore_filename), true);
1288 
1289 	close(fd);
1290 
1291 	if (map->prot & PROT_EXEC)
1292 		pr_debug("Using %s for kernel object code\n", kcore_filename);
1293 	else
1294 		pr_debug("Using %s for kernel data\n", kcore_filename);
1295 
1296 	return 0;
1297 
1298 out_err:
1299 	while (!list_empty(&md.maps)) {
1300 		map = list_entry(md.maps.next, struct map, node);
1301 		list_del_init(&map->node);
1302 		map__put(map);
1303 	}
1304 	close(fd);
1305 	return -EINVAL;
1306 }
1307 
1308 /*
1309  * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1310  * delta based on the relocation reference symbol.
1311  */
1312 static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1313 {
1314 	u64 addr;
1315 
1316 	if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1317 		return 0;
1318 
1319 	if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1320 		return -1;
1321 
1322 	*delta = addr - kmap->ref_reloc_sym->addr;
1323 	return 0;
1324 }
1325 
1326 int __dso__load_kallsyms(struct dso *dso, const char *filename,
1327 			 struct map *map, bool no_kcore)
1328 {
1329 	struct kmap *kmap = map__kmap(map);
1330 	u64 delta = 0;
1331 
1332 	if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1333 		return -1;
1334 
1335 	if (!kmap || !kmap->kmaps)
1336 		return -1;
1337 
1338 	if (dso__load_all_kallsyms(dso, filename) < 0)
1339 		return -1;
1340 
1341 	if (kallsyms__delta(kmap, filename, &delta))
1342 		return -1;
1343 
1344 	symbols__fixup_end(&dso->symbols);
1345 	symbols__fixup_duplicate(&dso->symbols);
1346 
1347 	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1348 		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1349 	else
1350 		dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1351 
1352 	if (!no_kcore && !dso__load_kcore(dso, map, filename))
1353 		return map_groups__split_kallsyms_for_kcore(kmap->kmaps, dso);
1354 	else
1355 		return map_groups__split_kallsyms(kmap->kmaps, dso, delta, map);
1356 }
1357 
1358 int dso__load_kallsyms(struct dso *dso, const char *filename,
1359 		       struct map *map)
1360 {
1361 	return __dso__load_kallsyms(dso, filename, map, false);
1362 }
1363 
1364 static int dso__load_perf_map(const char *map_path, struct dso *dso)
1365 {
1366 	char *line = NULL;
1367 	size_t n;
1368 	FILE *file;
1369 	int nr_syms = 0;
1370 
1371 	file = fopen(map_path, "r");
1372 	if (file == NULL)
1373 		goto out_failure;
1374 
1375 	while (!feof(file)) {
1376 		u64 start, size;
1377 		struct symbol *sym;
1378 		int line_len, len;
1379 
1380 		line_len = getline(&line, &n, file);
1381 		if (line_len < 0)
1382 			break;
1383 
1384 		if (!line)
1385 			goto out_failure;
1386 
1387 		line[--line_len] = '\0'; /* \n */
1388 
1389 		len = hex2u64(line, &start);
1390 
1391 		len++;
1392 		if (len + 2 >= line_len)
1393 			continue;
1394 
1395 		len += hex2u64(line + len, &size);
1396 
1397 		len++;
1398 		if (len + 2 >= line_len)
1399 			continue;
1400 
1401 		sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1402 
1403 		if (sym == NULL)
1404 			goto out_delete_line;
1405 
1406 		symbols__insert(&dso->symbols, sym);
1407 		nr_syms++;
1408 	}
1409 
1410 	free(line);
1411 	fclose(file);
1412 
1413 	return nr_syms;
1414 
1415 out_delete_line:
1416 	free(line);
1417 out_failure:
1418 	return -1;
1419 }
1420 
1421 static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1422 					   enum dso_binary_type type)
1423 {
1424 	switch (type) {
1425 	case DSO_BINARY_TYPE__JAVA_JIT:
1426 	case DSO_BINARY_TYPE__DEBUGLINK:
1427 	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1428 	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1429 	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1430 	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1431 	case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1432 		return !kmod && dso->kernel == DSO_TYPE_USER;
1433 
1434 	case DSO_BINARY_TYPE__KALLSYMS:
1435 	case DSO_BINARY_TYPE__VMLINUX:
1436 	case DSO_BINARY_TYPE__KCORE:
1437 		return dso->kernel == DSO_TYPE_KERNEL;
1438 
1439 	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1440 	case DSO_BINARY_TYPE__GUEST_VMLINUX:
1441 	case DSO_BINARY_TYPE__GUEST_KCORE:
1442 		return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1443 
1444 	case DSO_BINARY_TYPE__GUEST_KMODULE:
1445 	case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1446 	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1447 	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1448 		/*
1449 		 * kernel modules know their symtab type - it's set when
1450 		 * creating a module dso in machine__findnew_module_map().
1451 		 */
1452 		return kmod && dso->symtab_type == type;
1453 
1454 	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1455 	case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1456 		return true;
1457 
1458 	case DSO_BINARY_TYPE__BPF_PROG_INFO:
1459 	case DSO_BINARY_TYPE__NOT_FOUND:
1460 	default:
1461 		return false;
1462 	}
1463 }
1464 
1465 /* Checks for the existence of the perf-<pid>.map file in two different
1466  * locations.  First, if the process is a separate mount namespace, check in
1467  * that namespace using the pid of the innermost pid namespace.  If's not in a
1468  * namespace, or the file can't be found there, try in the mount namespace of
1469  * the tracing process using our view of its pid.
1470  */
1471 static int dso__find_perf_map(char *filebuf, size_t bufsz,
1472 			      struct nsinfo **nsip)
1473 {
1474 	struct nscookie nsc;
1475 	struct nsinfo *nsi;
1476 	struct nsinfo *nnsi;
1477 	int rc = -1;
1478 
1479 	nsi = *nsip;
1480 
1481 	if (nsi->need_setns) {
1482 		snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsi->nstgid);
1483 		nsinfo__mountns_enter(nsi, &nsc);
1484 		rc = access(filebuf, R_OK);
1485 		nsinfo__mountns_exit(&nsc);
1486 		if (rc == 0)
1487 			return rc;
1488 	}
1489 
1490 	nnsi = nsinfo__copy(nsi);
1491 	if (nnsi) {
1492 		nsinfo__put(nsi);
1493 
1494 		nnsi->need_setns = false;
1495 		snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nnsi->tgid);
1496 		*nsip = nnsi;
1497 		rc = 0;
1498 	}
1499 
1500 	return rc;
1501 }
1502 
1503 int dso__load(struct dso *dso, struct map *map)
1504 {
1505 	char *name;
1506 	int ret = -1;
1507 	u_int i;
1508 	struct machine *machine;
1509 	char *root_dir = (char *) "";
1510 	int ss_pos = 0;
1511 	struct symsrc ss_[2];
1512 	struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1513 	bool kmod;
1514 	bool perfmap;
1515 	unsigned char build_id[BUILD_ID_SIZE];
1516 	struct nscookie nsc;
1517 	char newmapname[PATH_MAX];
1518 	const char *map_path = dso->long_name;
1519 
1520 	perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1521 	if (perfmap) {
1522 		if (dso->nsinfo && (dso__find_perf_map(newmapname,
1523 		    sizeof(newmapname), &dso->nsinfo) == 0)) {
1524 			map_path = newmapname;
1525 		}
1526 	}
1527 
1528 	nsinfo__mountns_enter(dso->nsinfo, &nsc);
1529 	pthread_mutex_lock(&dso->lock);
1530 
1531 	/* check again under the dso->lock */
1532 	if (dso__loaded(dso)) {
1533 		ret = 1;
1534 		goto out;
1535 	}
1536 
1537 	if (map->groups && map->groups->machine)
1538 		machine = map->groups->machine;
1539 	else
1540 		machine = NULL;
1541 
1542 	if (dso->kernel) {
1543 		if (dso->kernel == DSO_TYPE_KERNEL)
1544 			ret = dso__load_kernel_sym(dso, map);
1545 		else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1546 			ret = dso__load_guest_kernel_sym(dso, map);
1547 
1548 		if (machine__is(machine, "x86_64"))
1549 			machine__map_x86_64_entry_trampolines(machine, dso);
1550 		goto out;
1551 	}
1552 
1553 	dso->adjust_symbols = 0;
1554 
1555 	if (perfmap) {
1556 		ret = dso__load_perf_map(map_path, dso);
1557 		dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1558 					     DSO_BINARY_TYPE__NOT_FOUND;
1559 		goto out;
1560 	}
1561 
1562 	if (machine)
1563 		root_dir = machine->root_dir;
1564 
1565 	name = malloc(PATH_MAX);
1566 	if (!name)
1567 		goto out;
1568 
1569 	kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1570 		dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1571 		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1572 		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1573 
1574 
1575 	/*
1576 	 * Read the build id if possible. This is required for
1577 	 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1578 	 */
1579 	if (!dso->has_build_id &&
1580 	    is_regular_file(dso->long_name)) {
1581 	    __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1582 	    if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
1583 		dso__set_build_id(dso, build_id);
1584 	}
1585 
1586 	/*
1587 	 * Iterate over candidate debug images.
1588 	 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1589 	 * and/or opd section) for processing.
1590 	 */
1591 	for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1592 		struct symsrc *ss = &ss_[ss_pos];
1593 		bool next_slot = false;
1594 		bool is_reg;
1595 		bool nsexit;
1596 		int sirc = -1;
1597 
1598 		enum dso_binary_type symtab_type = binary_type_symtab[i];
1599 
1600 		nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1601 		    symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1602 
1603 		if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1604 			continue;
1605 
1606 		if (dso__read_binary_type_filename(dso, symtab_type,
1607 						   root_dir, name, PATH_MAX))
1608 			continue;
1609 
1610 		if (nsexit)
1611 			nsinfo__mountns_exit(&nsc);
1612 
1613 		is_reg = is_regular_file(name);
1614 		if (is_reg)
1615 			sirc = symsrc__init(ss, dso, name, symtab_type);
1616 
1617 		if (nsexit)
1618 			nsinfo__mountns_enter(dso->nsinfo, &nsc);
1619 
1620 		if (!is_reg || sirc < 0)
1621 			continue;
1622 
1623 		if (!syms_ss && symsrc__has_symtab(ss)) {
1624 			syms_ss = ss;
1625 			next_slot = true;
1626 			if (!dso->symsrc_filename)
1627 				dso->symsrc_filename = strdup(name);
1628 		}
1629 
1630 		if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1631 			runtime_ss = ss;
1632 			next_slot = true;
1633 		}
1634 
1635 		if (next_slot) {
1636 			ss_pos++;
1637 
1638 			if (syms_ss && runtime_ss)
1639 				break;
1640 		} else {
1641 			symsrc__destroy(ss);
1642 		}
1643 
1644 	}
1645 
1646 	if (!runtime_ss && !syms_ss)
1647 		goto out_free;
1648 
1649 	if (runtime_ss && !syms_ss) {
1650 		syms_ss = runtime_ss;
1651 	}
1652 
1653 	/* We'll have to hope for the best */
1654 	if (!runtime_ss && syms_ss)
1655 		runtime_ss = syms_ss;
1656 
1657 	if (syms_ss)
1658 		ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1659 	else
1660 		ret = -1;
1661 
1662 	if (ret > 0) {
1663 		int nr_plt;
1664 
1665 		nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1666 		if (nr_plt > 0)
1667 			ret += nr_plt;
1668 	}
1669 
1670 	for (; ss_pos > 0; ss_pos--)
1671 		symsrc__destroy(&ss_[ss_pos - 1]);
1672 out_free:
1673 	free(name);
1674 	if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1675 		ret = 0;
1676 out:
1677 	dso__set_loaded(dso);
1678 	pthread_mutex_unlock(&dso->lock);
1679 	nsinfo__mountns_exit(&nsc);
1680 
1681 	return ret;
1682 }
1683 
1684 struct map *map_groups__find_by_name(struct map_groups *mg, const char *name)
1685 {
1686 	struct maps *maps = &mg->maps;
1687 	struct map *map;
1688 	struct rb_node *node;
1689 
1690 	down_read(&maps->lock);
1691 
1692 	for (node = maps->names.rb_node; node; ) {
1693 		int rc;
1694 
1695 		map = rb_entry(node, struct map, rb_node_name);
1696 
1697 		rc = strcmp(map->dso->short_name, name);
1698 		if (rc < 0)
1699 			node = node->rb_left;
1700 		else if (rc > 0)
1701 			node = node->rb_right;
1702 		else
1703 
1704 			goto out_unlock;
1705 	}
1706 
1707 	map = NULL;
1708 
1709 out_unlock:
1710 	up_read(&maps->lock);
1711 	return map;
1712 }
1713 
1714 int dso__load_vmlinux(struct dso *dso, struct map *map,
1715 		      const char *vmlinux, bool vmlinux_allocated)
1716 {
1717 	int err = -1;
1718 	struct symsrc ss;
1719 	char symfs_vmlinux[PATH_MAX];
1720 	enum dso_binary_type symtab_type;
1721 
1722 	if (vmlinux[0] == '/')
1723 		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1724 	else
1725 		symbol__join_symfs(symfs_vmlinux, vmlinux);
1726 
1727 	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1728 		symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1729 	else
1730 		symtab_type = DSO_BINARY_TYPE__VMLINUX;
1731 
1732 	if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
1733 		return -1;
1734 
1735 	err = dso__load_sym(dso, map, &ss, &ss, 0);
1736 	symsrc__destroy(&ss);
1737 
1738 	if (err > 0) {
1739 		if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1740 			dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1741 		else
1742 			dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1743 		dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1744 		dso__set_loaded(dso);
1745 		pr_debug("Using %s for symbols\n", symfs_vmlinux);
1746 	}
1747 
1748 	return err;
1749 }
1750 
1751 int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1752 {
1753 	int i, err = 0;
1754 	char *filename = NULL;
1755 
1756 	pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1757 		 vmlinux_path__nr_entries + 1);
1758 
1759 	for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1760 		err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1761 		if (err > 0)
1762 			goto out;
1763 	}
1764 
1765 	if (!symbol_conf.ignore_vmlinux_buildid)
1766 		filename = dso__build_id_filename(dso, NULL, 0, false);
1767 	if (filename != NULL) {
1768 		err = dso__load_vmlinux(dso, map, filename, true);
1769 		if (err > 0)
1770 			goto out;
1771 		free(filename);
1772 	}
1773 out:
1774 	return err;
1775 }
1776 
1777 static bool visible_dir_filter(const char *name, struct dirent *d)
1778 {
1779 	if (d->d_type != DT_DIR)
1780 		return false;
1781 	return lsdir_no_dot_filter(name, d);
1782 }
1783 
1784 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1785 {
1786 	char kallsyms_filename[PATH_MAX];
1787 	int ret = -1;
1788 	struct strlist *dirs;
1789 	struct str_node *nd;
1790 
1791 	dirs = lsdir(dir, visible_dir_filter);
1792 	if (!dirs)
1793 		return -1;
1794 
1795 	strlist__for_each_entry(nd, dirs) {
1796 		scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1797 			  "%s/%s/kallsyms", dir, nd->s);
1798 		if (!validate_kcore_addresses(kallsyms_filename, map)) {
1799 			strlcpy(dir, kallsyms_filename, dir_sz);
1800 			ret = 0;
1801 			break;
1802 		}
1803 	}
1804 
1805 	strlist__delete(dirs);
1806 
1807 	return ret;
1808 }
1809 
1810 /*
1811  * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
1812  * since access(R_OK) only checks with real UID/GID but open() use effective
1813  * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
1814  */
1815 static bool filename__readable(const char *file)
1816 {
1817 	int fd = open(file, O_RDONLY);
1818 	if (fd < 0)
1819 		return false;
1820 	close(fd);
1821 	return true;
1822 }
1823 
1824 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1825 {
1826 	u8 host_build_id[BUILD_ID_SIZE];
1827 	char sbuild_id[SBUILD_ID_SIZE];
1828 	bool is_host = false;
1829 	char path[PATH_MAX];
1830 
1831 	if (!dso->has_build_id) {
1832 		/*
1833 		 * Last resort, if we don't have a build-id and couldn't find
1834 		 * any vmlinux file, try the running kernel kallsyms table.
1835 		 */
1836 		goto proc_kallsyms;
1837 	}
1838 
1839 	if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1840 				 sizeof(host_build_id)) == 0)
1841 		is_host = dso__build_id_equal(dso, host_build_id);
1842 
1843 	/* Try a fast path for /proc/kallsyms if possible */
1844 	if (is_host) {
1845 		/*
1846 		 * Do not check the build-id cache, unless we know we cannot use
1847 		 * /proc/kcore or module maps don't match to /proc/kallsyms.
1848 		 * To check readability of /proc/kcore, do not use access(R_OK)
1849 		 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
1850 		 * can't check it.
1851 		 */
1852 		if (filename__readable("/proc/kcore") &&
1853 		    !validate_kcore_addresses("/proc/kallsyms", map))
1854 			goto proc_kallsyms;
1855 	}
1856 
1857 	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1858 
1859 	/* Find kallsyms in build-id cache with kcore */
1860 	scnprintf(path, sizeof(path), "%s/%s/%s",
1861 		  buildid_dir, DSO__NAME_KCORE, sbuild_id);
1862 
1863 	if (!find_matching_kcore(map, path, sizeof(path)))
1864 		return strdup(path);
1865 
1866 	/* Use current /proc/kallsyms if possible */
1867 	if (is_host) {
1868 proc_kallsyms:
1869 		return strdup("/proc/kallsyms");
1870 	}
1871 
1872 	/* Finally, find a cache of kallsyms */
1873 	if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
1874 		pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1875 		       sbuild_id);
1876 		return NULL;
1877 	}
1878 
1879 	return strdup(path);
1880 }
1881 
1882 static int dso__load_kernel_sym(struct dso *dso, struct map *map)
1883 {
1884 	int err;
1885 	const char *kallsyms_filename = NULL;
1886 	char *kallsyms_allocated_filename = NULL;
1887 	/*
1888 	 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1889 	 * it and only it, reporting errors to the user if it cannot be used.
1890 	 *
1891 	 * For instance, try to analyse an ARM perf.data file _without_ a
1892 	 * build-id, or if the user specifies the wrong path to the right
1893 	 * vmlinux file, obviously we can't fallback to another vmlinux (a
1894 	 * x86_86 one, on the machine where analysis is being performed, say),
1895 	 * or worse, /proc/kallsyms.
1896 	 *
1897 	 * If the specified file _has_ a build-id and there is a build-id
1898 	 * section in the perf.data file, we will still do the expected
1899 	 * validation in dso__load_vmlinux and will bail out if they don't
1900 	 * match.
1901 	 */
1902 	if (symbol_conf.kallsyms_name != NULL) {
1903 		kallsyms_filename = symbol_conf.kallsyms_name;
1904 		goto do_kallsyms;
1905 	}
1906 
1907 	if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1908 		return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
1909 	}
1910 
1911 	if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1912 		err = dso__load_vmlinux_path(dso, map);
1913 		if (err > 0)
1914 			return err;
1915 	}
1916 
1917 	/* do not try local files if a symfs was given */
1918 	if (symbol_conf.symfs[0] != 0)
1919 		return -1;
1920 
1921 	kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1922 	if (!kallsyms_allocated_filename)
1923 		return -1;
1924 
1925 	kallsyms_filename = kallsyms_allocated_filename;
1926 
1927 do_kallsyms:
1928 	err = dso__load_kallsyms(dso, kallsyms_filename, map);
1929 	if (err > 0)
1930 		pr_debug("Using %s for symbols\n", kallsyms_filename);
1931 	free(kallsyms_allocated_filename);
1932 
1933 	if (err > 0 && !dso__is_kcore(dso)) {
1934 		dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
1935 		dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
1936 		map__fixup_start(map);
1937 		map__fixup_end(map);
1938 	}
1939 
1940 	return err;
1941 }
1942 
1943 static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
1944 {
1945 	int err;
1946 	const char *kallsyms_filename = NULL;
1947 	struct machine *machine;
1948 	char path[PATH_MAX];
1949 
1950 	if (!map->groups) {
1951 		pr_debug("Guest kernel map hasn't the point to groups\n");
1952 		return -1;
1953 	}
1954 	machine = map->groups->machine;
1955 
1956 	if (machine__is_default_guest(machine)) {
1957 		/*
1958 		 * if the user specified a vmlinux filename, use it and only
1959 		 * it, reporting errors to the user if it cannot be used.
1960 		 * Or use file guest_kallsyms inputted by user on commandline
1961 		 */
1962 		if (symbol_conf.default_guest_vmlinux_name != NULL) {
1963 			err = dso__load_vmlinux(dso, map,
1964 						symbol_conf.default_guest_vmlinux_name,
1965 						false);
1966 			return err;
1967 		}
1968 
1969 		kallsyms_filename = symbol_conf.default_guest_kallsyms;
1970 		if (!kallsyms_filename)
1971 			return -1;
1972 	} else {
1973 		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1974 		kallsyms_filename = path;
1975 	}
1976 
1977 	err = dso__load_kallsyms(dso, kallsyms_filename, map);
1978 	if (err > 0)
1979 		pr_debug("Using %s for symbols\n", kallsyms_filename);
1980 	if (err > 0 && !dso__is_kcore(dso)) {
1981 		dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1982 		dso__set_long_name(dso, machine->mmap_name, false);
1983 		map__fixup_start(map);
1984 		map__fixup_end(map);
1985 	}
1986 
1987 	return err;
1988 }
1989 
1990 static void vmlinux_path__exit(void)
1991 {
1992 	while (--vmlinux_path__nr_entries >= 0)
1993 		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
1994 	vmlinux_path__nr_entries = 0;
1995 
1996 	zfree(&vmlinux_path);
1997 }
1998 
1999 static const char * const vmlinux_paths[] = {
2000 	"vmlinux",
2001 	"/boot/vmlinux"
2002 };
2003 
2004 static const char * const vmlinux_paths_upd[] = {
2005 	"/boot/vmlinux-%s",
2006 	"/usr/lib/debug/boot/vmlinux-%s",
2007 	"/lib/modules/%s/build/vmlinux",
2008 	"/usr/lib/debug/lib/modules/%s/vmlinux",
2009 	"/usr/lib/debug/boot/vmlinux-%s.debug"
2010 };
2011 
2012 static int vmlinux_path__add(const char *new_entry)
2013 {
2014 	vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2015 	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2016 		return -1;
2017 	++vmlinux_path__nr_entries;
2018 
2019 	return 0;
2020 }
2021 
2022 static int vmlinux_path__init(struct perf_env *env)
2023 {
2024 	struct utsname uts;
2025 	char bf[PATH_MAX];
2026 	char *kernel_version;
2027 	unsigned int i;
2028 
2029 	vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2030 			      ARRAY_SIZE(vmlinux_paths_upd)));
2031 	if (vmlinux_path == NULL)
2032 		return -1;
2033 
2034 	for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2035 		if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2036 			goto out_fail;
2037 
2038 	/* only try kernel version if no symfs was given */
2039 	if (symbol_conf.symfs[0] != 0)
2040 		return 0;
2041 
2042 	if (env) {
2043 		kernel_version = env->os_release;
2044 	} else {
2045 		if (uname(&uts) < 0)
2046 			goto out_fail;
2047 
2048 		kernel_version = uts.release;
2049 	}
2050 
2051 	for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2052 		snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2053 		if (vmlinux_path__add(bf) < 0)
2054 			goto out_fail;
2055 	}
2056 
2057 	return 0;
2058 
2059 out_fail:
2060 	vmlinux_path__exit();
2061 	return -1;
2062 }
2063 
2064 int setup_list(struct strlist **list, const char *list_str,
2065 		      const char *list_name)
2066 {
2067 	if (list_str == NULL)
2068 		return 0;
2069 
2070 	*list = strlist__new(list_str, NULL);
2071 	if (!*list) {
2072 		pr_err("problems parsing %s list\n", list_name);
2073 		return -1;
2074 	}
2075 
2076 	symbol_conf.has_filter = true;
2077 	return 0;
2078 }
2079 
2080 int setup_intlist(struct intlist **list, const char *list_str,
2081 		  const char *list_name)
2082 {
2083 	if (list_str == NULL)
2084 		return 0;
2085 
2086 	*list = intlist__new(list_str);
2087 	if (!*list) {
2088 		pr_err("problems parsing %s list\n", list_name);
2089 		return -1;
2090 	}
2091 	return 0;
2092 }
2093 
2094 static bool symbol__read_kptr_restrict(void)
2095 {
2096 	bool value = false;
2097 	FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2098 
2099 	if (fp != NULL) {
2100 		char line[8];
2101 
2102 		if (fgets(line, sizeof(line), fp) != NULL)
2103 			value = ((geteuid() != 0) || (getuid() != 0)) ?
2104 					(atoi(line) != 0) :
2105 					(atoi(line) == 2);
2106 
2107 		fclose(fp);
2108 	}
2109 
2110 	return value;
2111 }
2112 
2113 int symbol__annotation_init(void)
2114 {
2115 	if (symbol_conf.init_annotation)
2116 		return 0;
2117 
2118 	if (symbol_conf.initialized) {
2119 		pr_err("Annotation needs to be init before symbol__init()\n");
2120 		return -1;
2121 	}
2122 
2123 	symbol_conf.priv_size += sizeof(struct annotation);
2124 	symbol_conf.init_annotation = true;
2125 	return 0;
2126 }
2127 
2128 int symbol__init(struct perf_env *env)
2129 {
2130 	const char *symfs;
2131 
2132 	if (symbol_conf.initialized)
2133 		return 0;
2134 
2135 	symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2136 
2137 	symbol__elf_init();
2138 
2139 	if (symbol_conf.sort_by_name)
2140 		symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
2141 					  sizeof(struct symbol));
2142 
2143 	if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2144 		return -1;
2145 
2146 	if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2147 		pr_err("'.' is the only non valid --field-separator argument\n");
2148 		return -1;
2149 	}
2150 
2151 	if (setup_list(&symbol_conf.dso_list,
2152 		       symbol_conf.dso_list_str, "dso") < 0)
2153 		return -1;
2154 
2155 	if (setup_list(&symbol_conf.comm_list,
2156 		       symbol_conf.comm_list_str, "comm") < 0)
2157 		goto out_free_dso_list;
2158 
2159 	if (setup_intlist(&symbol_conf.pid_list,
2160 		       symbol_conf.pid_list_str, "pid") < 0)
2161 		goto out_free_comm_list;
2162 
2163 	if (setup_intlist(&symbol_conf.tid_list,
2164 		       symbol_conf.tid_list_str, "tid") < 0)
2165 		goto out_free_pid_list;
2166 
2167 	if (setup_list(&symbol_conf.sym_list,
2168 		       symbol_conf.sym_list_str, "symbol") < 0)
2169 		goto out_free_tid_list;
2170 
2171 	if (setup_list(&symbol_conf.bt_stop_list,
2172 		       symbol_conf.bt_stop_list_str, "symbol") < 0)
2173 		goto out_free_sym_list;
2174 
2175 	/*
2176 	 * A path to symbols of "/" is identical to ""
2177 	 * reset here for simplicity.
2178 	 */
2179 	symfs = realpath(symbol_conf.symfs, NULL);
2180 	if (symfs == NULL)
2181 		symfs = symbol_conf.symfs;
2182 	if (strcmp(symfs, "/") == 0)
2183 		symbol_conf.symfs = "";
2184 	if (symfs != symbol_conf.symfs)
2185 		free((void *)symfs);
2186 
2187 	symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2188 
2189 	symbol_conf.initialized = true;
2190 	return 0;
2191 
2192 out_free_sym_list:
2193 	strlist__delete(symbol_conf.sym_list);
2194 out_free_tid_list:
2195 	intlist__delete(symbol_conf.tid_list);
2196 out_free_pid_list:
2197 	intlist__delete(symbol_conf.pid_list);
2198 out_free_comm_list:
2199 	strlist__delete(symbol_conf.comm_list);
2200 out_free_dso_list:
2201 	strlist__delete(symbol_conf.dso_list);
2202 	return -1;
2203 }
2204 
2205 void symbol__exit(void)
2206 {
2207 	if (!symbol_conf.initialized)
2208 		return;
2209 	strlist__delete(symbol_conf.bt_stop_list);
2210 	strlist__delete(symbol_conf.sym_list);
2211 	strlist__delete(symbol_conf.dso_list);
2212 	strlist__delete(symbol_conf.comm_list);
2213 	intlist__delete(symbol_conf.tid_list);
2214 	intlist__delete(symbol_conf.pid_list);
2215 	vmlinux_path__exit();
2216 	symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2217 	symbol_conf.bt_stop_list = NULL;
2218 	symbol_conf.initialized = false;
2219 }
2220 
2221 int symbol__config_symfs(const struct option *opt __maybe_unused,
2222 			 const char *dir, int unset __maybe_unused)
2223 {
2224 	char *bf = NULL;
2225 	int ret;
2226 
2227 	symbol_conf.symfs = strdup(dir);
2228 	if (symbol_conf.symfs == NULL)
2229 		return -ENOMEM;
2230 
2231 	/* skip the locally configured cache if a symfs is given, and
2232 	 * config buildid dir to symfs/.debug
2233 	 */
2234 	ret = asprintf(&bf, "%s/%s", dir, ".debug");
2235 	if (ret < 0)
2236 		return -ENOMEM;
2237 
2238 	set_buildid_dir(bf);
2239 
2240 	free(bf);
2241 	return 0;
2242 }
2243 
2244 struct mem_info *mem_info__get(struct mem_info *mi)
2245 {
2246 	if (mi)
2247 		refcount_inc(&mi->refcnt);
2248 	return mi;
2249 }
2250 
2251 void mem_info__put(struct mem_info *mi)
2252 {
2253 	if (mi && refcount_dec_and_test(&mi->refcnt))
2254 		free(mi);
2255 }
2256 
2257 struct mem_info *mem_info__new(void)
2258 {
2259 	struct mem_info *mi = zalloc(sizeof(*mi));
2260 
2261 	if (mi)
2262 		refcount_set(&mi->refcnt, 1);
2263 	return mi;
2264 }
2265