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/capability.h>
   8#include <linux/kernel.h>
   9#include <linux/mman.h>
  10#include <linux/string.h>
  11#include <linux/time64.h>
  12#include <sys/types.h>
  13#include <sys/stat.h>
  14#include <sys/param.h>
  15#include <fcntl.h>
  16#include <unistd.h>
  17#include <inttypes.h>
  18#include "annotate.h"
  19#include "build-id.h"
  20#include "cap.h"
  21#include "dso.h"
  22#include "util.h" // lsdir()
  23#include "debug.h"
  24#include "event.h"
  25#include "machine.h"
  26#include "map.h"
  27#include "symbol.h"
  28#include "map_symbol.h"
  29#include "mem-events.h"
  30#include "symsrc.h"
  31#include "strlist.h"
  32#include "intlist.h"
  33#include "namespaces.h"
  34#include "header.h"
  35#include "path.h"
  36#include <linux/ctype.h>
  37#include <linux/zalloc.h>
  38
  39#include <elf.h>
  40#include <limits.h>
  41#include <symbol/kallsyms.h>
  42#include <sys/utsname.h>
  43
  44static int dso__load_kernel_sym(struct dso *dso, struct map *map);
  45static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map);
  46static bool symbol__is_idle(const char *name);
  47
  48int vmlinux_path__nr_entries;
  49char **vmlinux_path;
  50
  51struct symbol_conf symbol_conf = {
  52	.nanosecs		= false,
  53	.use_modules		= true,
  54	.try_vmlinux_path	= true,
  55	.demangle		= true,
  56	.demangle_kernel	= false,
  57	.cumulate_callchain	= true,
  58	.time_quantum		= 100 * NSEC_PER_MSEC, /* 100ms */
  59	.show_hist_headers	= true,
  60	.symfs			= "",
  61	.event_group		= true,
  62	.inline_name		= true,
  63	.res_sample		= 0,
  64};
  65
 
 
 
 
 
 
 
 
 
 
  66static enum dso_binary_type binary_type_symtab[] = {
  67	DSO_BINARY_TYPE__KALLSYMS,
  68	DSO_BINARY_TYPE__GUEST_KALLSYMS,
  69	DSO_BINARY_TYPE__JAVA_JIT,
  70	DSO_BINARY_TYPE__DEBUGLINK,
  71	DSO_BINARY_TYPE__BUILD_ID_CACHE,
  72	DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO,
  73	DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  74	DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  75	DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  76	DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  77	DSO_BINARY_TYPE__GUEST_KMODULE,
  78	DSO_BINARY_TYPE__GUEST_KMODULE_COMP,
  79	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
  80	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP,
  81	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
  82	DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO,
  83	DSO_BINARY_TYPE__NOT_FOUND,
  84};
  85
  86#define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  87
  88static bool symbol_type__filter(char symbol_type)
  89{
  90	symbol_type = toupper(symbol_type);
  91	return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B';
  92}
  93
  94static int prefix_underscores_count(const char *str)
  95{
  96	const char *tail = str;
  97
  98	while (*tail == '_')
  99		tail++;
 100
 101	return tail - str;
 102}
 103
 104const char * __weak arch__normalize_symbol_name(const char *name)
 105{
 106	return name;
 107}
 108
 109int __weak arch__compare_symbol_names(const char *namea, const char *nameb)
 110{
 111	return strcmp(namea, nameb);
 112}
 113
 114int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb,
 115					unsigned int n)
 116{
 117	return strncmp(namea, nameb, n);
 118}
 119
 120int __weak arch__choose_best_symbol(struct symbol *syma,
 121				    struct symbol *symb __maybe_unused)
 122{
 123	/* Avoid "SyS" kernel syscall aliases */
 124	if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3))
 125		return SYMBOL_B;
 126	if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 127		return SYMBOL_B;
 128
 129	return SYMBOL_A;
 130}
 131
 132static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
 133{
 134	s64 a;
 135	s64 b;
 136	size_t na, nb;
 137
 138	/* Prefer a symbol with non zero length */
 139	a = syma->end - syma->start;
 140	b = symb->end - symb->start;
 141	if ((b == 0) && (a > 0))
 142		return SYMBOL_A;
 143	else if ((a == 0) && (b > 0))
 144		return SYMBOL_B;
 145
 146	/* Prefer a non weak symbol over a weak one */
 147	a = syma->binding == STB_WEAK;
 148	b = symb->binding == STB_WEAK;
 149	if (b && !a)
 150		return SYMBOL_A;
 151	if (a && !b)
 152		return SYMBOL_B;
 153
 154	/* Prefer a global symbol over a non global one */
 155	a = syma->binding == STB_GLOBAL;
 156	b = symb->binding == STB_GLOBAL;
 157	if (a && !b)
 158		return SYMBOL_A;
 159	if (b && !a)
 160		return SYMBOL_B;
 161
 162	/* Prefer a symbol with less underscores */
 163	a = prefix_underscores_count(syma->name);
 164	b = prefix_underscores_count(symb->name);
 165	if (b > a)
 166		return SYMBOL_A;
 167	else if (a > b)
 168		return SYMBOL_B;
 169
 170	/* Choose the symbol with the longest name */
 171	na = strlen(syma->name);
 172	nb = strlen(symb->name);
 173	if (na > nb)
 174		return SYMBOL_A;
 175	else if (na < nb)
 176		return SYMBOL_B;
 177
 178	return arch__choose_best_symbol(syma, symb);
 179}
 180
 181void symbols__fixup_duplicate(struct rb_root_cached *symbols)
 182{
 183	struct rb_node *nd;
 184	struct symbol *curr, *next;
 185
 186	if (symbol_conf.allow_aliases)
 187		return;
 188
 189	nd = rb_first_cached(symbols);
 190
 191	while (nd) {
 192		curr = rb_entry(nd, struct symbol, rb_node);
 193again:
 194		nd = rb_next(&curr->rb_node);
 195		if (!nd)
 196			break;
 197
 198		next = rb_entry(nd, struct symbol, rb_node);
 199		if (curr->start != next->start)
 200			continue;
 201
 202		if (choose_best_symbol(curr, next) == SYMBOL_A) {
 203			if (next->type == STT_GNU_IFUNC)
 204				curr->ifunc_alias = true;
 205			rb_erase_cached(&next->rb_node, symbols);
 206			symbol__delete(next);
 207			goto again;
 208		} else {
 209			if (curr->type == STT_GNU_IFUNC)
 210				next->ifunc_alias = true;
 211			nd = rb_next(&curr->rb_node);
 212			rb_erase_cached(&curr->rb_node, symbols);
 213			symbol__delete(curr);
 214		}
 215	}
 216}
 217
 218/* Update zero-sized symbols using the address of the next symbol */
 219void symbols__fixup_end(struct rb_root_cached *symbols, bool is_kallsyms)
 220{
 221	struct rb_node *nd, *prevnd = rb_first_cached(symbols);
 222	struct symbol *curr, *prev;
 223
 224	if (prevnd == NULL)
 225		return;
 226
 227	curr = rb_entry(prevnd, struct symbol, rb_node);
 228
 229	for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 230		prev = curr;
 231		curr = rb_entry(nd, struct symbol, rb_node);
 232
 233		/*
 234		 * On some architecture kernel text segment start is located at
 235		 * some low memory address, while modules are located at high
 236		 * memory addresses (or vice versa).  The gap between end of
 237		 * kernel text segment and beginning of first module's text
 238		 * segment is very big.  Therefore do not fill this gap and do
 239		 * not assign it to the kernel dso map (kallsyms).
 240		 *
 
 
 
 
 241		 * In kallsyms, it determines module symbols using '[' character
 242		 * like in:
 243		 *   ffffffffc1937000 T hdmi_driver_init  [snd_hda_codec_hdmi]
 244		 */
 245		if (prev->end == prev->start) {
 
 
 
 
 
 
 
 
 
 
 
 246			/* Last kernel/module symbol mapped to end of page */
 247			if (is_kallsyms && (!strchr(prev->name, '[') !=
 248					    !strchr(curr->name, '[')))
 
 
 249				prev->end = roundup(prev->end + 4096, 4096);
 250			else
 251				prev->end = curr->start;
 252
 253			pr_debug4("%s sym:%s end:%#" PRIx64 "\n",
 254				  __func__, prev->name, prev->end);
 255		}
 256	}
 257
 258	/* Last entry */
 259	if (curr->end == curr->start)
 260		curr->end = roundup(curr->start, 4096) + 4096;
 261}
 262
 263struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name)
 264{
 265	size_t namelen = strlen(name) + 1;
 266	struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 267					sizeof(*sym) + namelen));
 268	if (sym == NULL)
 269		return NULL;
 270
 271	if (symbol_conf.priv_size) {
 272		if (symbol_conf.init_annotation) {
 273			struct annotation *notes = (void *)sym;
 274			annotation__init(notes);
 275		}
 276		sym = ((void *)sym) + symbol_conf.priv_size;
 277	}
 278
 279	sym->start   = start;
 280	sym->end     = len ? start + len : start;
 281	sym->type    = type;
 282	sym->binding = binding;
 283	sym->namelen = namelen - 1;
 284
 285	pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 286		  __func__, name, start, sym->end);
 287	memcpy(sym->name, name, namelen);
 288
 289	return sym;
 290}
 291
 292void symbol__delete(struct symbol *sym)
 293{
 294	if (symbol_conf.priv_size) {
 295		if (symbol_conf.init_annotation) {
 296			struct annotation *notes = symbol__annotation(sym);
 297
 298			annotation__exit(notes);
 299		}
 300	}
 301	free(((void *)sym) - symbol_conf.priv_size);
 302}
 303
 304void symbols__delete(struct rb_root_cached *symbols)
 305{
 306	struct symbol *pos;
 307	struct rb_node *next = rb_first_cached(symbols);
 308
 309	while (next) {
 310		pos = rb_entry(next, struct symbol, rb_node);
 311		next = rb_next(&pos->rb_node);
 312		rb_erase_cached(&pos->rb_node, symbols);
 313		symbol__delete(pos);
 314	}
 315}
 316
 317void __symbols__insert(struct rb_root_cached *symbols,
 318		       struct symbol *sym, bool kernel)
 319{
 320	struct rb_node **p = &symbols->rb_root.rb_node;
 321	struct rb_node *parent = NULL;
 322	const u64 ip = sym->start;
 323	struct symbol *s;
 324	bool leftmost = true;
 325
 326	if (kernel) {
 327		const char *name = sym->name;
 328		/*
 329		 * ppc64 uses function descriptors and appends a '.' to the
 330		 * start of every instruction address. Remove it.
 331		 */
 332		if (name[0] == '.')
 333			name++;
 334		sym->idle = symbol__is_idle(name);
 335	}
 336
 337	while (*p != NULL) {
 338		parent = *p;
 339		s = rb_entry(parent, struct symbol, rb_node);
 340		if (ip < s->start)
 341			p = &(*p)->rb_left;
 342		else {
 343			p = &(*p)->rb_right;
 344			leftmost = false;
 345		}
 346	}
 347	rb_link_node(&sym->rb_node, parent, p);
 348	rb_insert_color_cached(&sym->rb_node, symbols, leftmost);
 349}
 350
 351void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym)
 352{
 353	__symbols__insert(symbols, sym, false);
 354}
 355
 356static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip)
 357{
 358	struct rb_node *n;
 359
 360	if (symbols == NULL)
 361		return NULL;
 362
 363	n = symbols->rb_root.rb_node;
 364
 365	while (n) {
 366		struct symbol *s = rb_entry(n, struct symbol, rb_node);
 367
 368		if (ip < s->start)
 369			n = n->rb_left;
 370		else if (ip > s->end || (ip == s->end && ip != s->start))
 371			n = n->rb_right;
 372		else
 373			return s;
 374	}
 375
 376	return NULL;
 377}
 378
 379static struct symbol *symbols__first(struct rb_root_cached *symbols)
 380{
 381	struct rb_node *n = rb_first_cached(symbols);
 382
 383	if (n)
 384		return rb_entry(n, struct symbol, rb_node);
 385
 386	return NULL;
 387}
 388
 389static struct symbol *symbols__last(struct rb_root_cached *symbols)
 390{
 391	struct rb_node *n = rb_last(&symbols->rb_root);
 392
 393	if (n)
 394		return rb_entry(n, struct symbol, rb_node);
 395
 396	return NULL;
 397}
 398
 399static struct symbol *symbols__next(struct symbol *sym)
 400{
 401	struct rb_node *n = rb_next(&sym->rb_node);
 402
 403	if (n)
 404		return rb_entry(n, struct symbol, rb_node);
 405
 406	return NULL;
 407}
 408
 409static int symbols__sort_name_cmp(const void *vlhs, const void *vrhs)
 410{
 411	const struct symbol *lhs = *((const struct symbol **)vlhs);
 412	const struct symbol *rhs = *((const struct symbol **)vrhs);
 413
 414	return strcmp(lhs->name, rhs->name);
 415}
 416
 417static struct symbol **symbols__sort_by_name(struct rb_root_cached *source, size_t *len)
 418{
 419	struct rb_node *nd;
 420	struct symbol **result;
 421	size_t i = 0, size = 0;
 422
 423	for (nd = rb_first_cached(source); nd; nd = rb_next(nd))
 424		size++;
 425
 426	result = malloc(sizeof(*result) * size);
 427	if (!result)
 428		return NULL;
 429
 430	for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) {
 431		struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 432
 433		result[i++] = pos;
 434	}
 435	qsort(result, size, sizeof(*result), symbols__sort_name_cmp);
 436	*len = size;
 437	return result;
 438}
 439
 440int symbol__match_symbol_name(const char *name, const char *str,
 441			      enum symbol_tag_include includes)
 442{
 443	const char *versioning;
 444
 445	if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY &&
 446	    (versioning = strstr(name, "@@"))) {
 447		int len = strlen(str);
 448
 449		if (len < versioning - name)
 450			len = versioning - name;
 451
 452		return arch__compare_symbol_names_n(name, str, len);
 453	} else
 454		return arch__compare_symbol_names(name, str);
 455}
 456
 457static struct symbol *symbols__find_by_name(struct symbol *symbols[],
 458					    size_t symbols_len,
 459					    const char *name,
 460					    enum symbol_tag_include includes,
 461					    size_t *found_idx)
 462{
 463	size_t i, lower = 0, upper = symbols_len;
 464	struct symbol *s = NULL;
 465
 466	if (found_idx)
 467		*found_idx = SIZE_MAX;
 468
 469	if (!symbols_len)
 470		return NULL;
 471
 472	while (lower < upper) {
 473		int cmp;
 474
 475		i = (lower + upper) / 2;
 476		cmp = symbol__match_symbol_name(symbols[i]->name, name, includes);
 477
 478		if (cmp > 0)
 479			upper = i;
 480		else if (cmp < 0)
 481			lower = i + 1;
 482		else {
 483			if (found_idx)
 484				*found_idx = i;
 485			s = symbols[i];
 486			break;
 487		}
 488	}
 489	if (s && includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY) {
 490		/* return first symbol that has same name (if any) */
 491		for (; i > 0; i--) {
 492			struct symbol *tmp = symbols[i - 1];
 493
 494			if (!arch__compare_symbol_names(tmp->name, s->name)) {
 495				if (found_idx)
 496					*found_idx = i - 1;
 497				s = tmp;
 498			} else
 499				break;
 500		}
 501	}
 502	assert(!found_idx || !s || s == symbols[*found_idx]);
 503	return s;
 504}
 505
 506void dso__reset_find_symbol_cache(struct dso *dso)
 507{
 508	dso->last_find_result.addr   = 0;
 509	dso->last_find_result.symbol = NULL;
 510}
 511
 512void dso__insert_symbol(struct dso *dso, struct symbol *sym)
 513{
 514	__symbols__insert(&dso->symbols, sym, dso->kernel);
 515
 516	/* update the symbol cache if necessary */
 517	if (dso->last_find_result.addr >= sym->start &&
 518	    (dso->last_find_result.addr < sym->end ||
 519	    sym->start == sym->end)) {
 520		dso->last_find_result.symbol = sym;
 521	}
 522}
 523
 524void dso__delete_symbol(struct dso *dso, struct symbol *sym)
 525{
 526	rb_erase_cached(&sym->rb_node, &dso->symbols);
 527	symbol__delete(sym);
 528	dso__reset_find_symbol_cache(dso);
 529}
 530
 531struct symbol *dso__find_symbol(struct dso *dso, u64 addr)
 532{
 533	if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) {
 534		dso->last_find_result.addr   = addr;
 535		dso->last_find_result.symbol = symbols__find(&dso->symbols, addr);
 536	}
 537
 538	return dso->last_find_result.symbol;
 539}
 540
 541struct symbol *dso__find_symbol_nocache(struct dso *dso, u64 addr)
 542{
 543	return symbols__find(&dso->symbols, addr);
 544}
 545
 546struct symbol *dso__first_symbol(struct dso *dso)
 547{
 548	return symbols__first(&dso->symbols);
 549}
 550
 551struct symbol *dso__last_symbol(struct dso *dso)
 552{
 553	return symbols__last(&dso->symbols);
 554}
 555
 556struct symbol *dso__next_symbol(struct symbol *sym)
 557{
 558	return symbols__next(sym);
 559}
 560
 561struct symbol *dso__next_symbol_by_name(struct dso *dso, size_t *idx)
 562{
 563	if (*idx + 1 >= dso->symbol_names_len)
 564		return NULL;
 565
 566	++*idx;
 567	return dso->symbol_names[*idx];
 568}
 569
 570 /*
 571  * Returns first symbol that matched with @name.
 572  */
 573struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name, size_t *idx)
 574{
 575	struct symbol *s = symbols__find_by_name(dso->symbol_names, dso->symbol_names_len,
 576						name, SYMBOL_TAG_INCLUDE__NONE, idx);
 577	if (!s)
 578		s = symbols__find_by_name(dso->symbol_names, dso->symbol_names_len,
 579					name, SYMBOL_TAG_INCLUDE__DEFAULT_ONLY, idx);
 580	return s;
 581}
 582
 583void dso__sort_by_name(struct dso *dso)
 584{
 585	mutex_lock(&dso->lock);
 586	if (!dso__sorted_by_name(dso)) {
 587		size_t len;
 588
 589		dso->symbol_names = symbols__sort_by_name(&dso->symbols, &len);
 590		if (dso->symbol_names) {
 591			dso->symbol_names_len = len;
 592			dso__set_sorted_by_name(dso);
 593		}
 594	}
 595	mutex_unlock(&dso->lock);
 596}
 597
 598/*
 599 * While we find nice hex chars, build a long_val.
 600 * Return number of chars processed.
 601 */
 602static int hex2u64(const char *ptr, u64 *long_val)
 603{
 604	char *p;
 605
 606	*long_val = strtoull(ptr, &p, 16);
 607
 608	return p - ptr;
 609}
 610
 611
 612int modules__parse(const char *filename, void *arg,
 613		   int (*process_module)(void *arg, const char *name,
 614					 u64 start, u64 size))
 615{
 616	char *line = NULL;
 617	size_t n;
 618	FILE *file;
 619	int err = 0;
 620
 621	file = fopen(filename, "r");
 622	if (file == NULL)
 623		return -1;
 624
 625	while (1) {
 626		char name[PATH_MAX];
 627		u64 start, size;
 628		char *sep, *endptr;
 629		ssize_t line_len;
 630
 631		line_len = getline(&line, &n, file);
 632		if (line_len < 0) {
 633			if (feof(file))
 634				break;
 635			err = -1;
 636			goto out;
 637		}
 638
 639		if (!line) {
 640			err = -1;
 641			goto out;
 642		}
 643
 644		line[--line_len] = '\0'; /* \n */
 645
 646		sep = strrchr(line, 'x');
 647		if (sep == NULL)
 648			continue;
 649
 650		hex2u64(sep + 1, &start);
 651
 652		sep = strchr(line, ' ');
 653		if (sep == NULL)
 654			continue;
 655
 656		*sep = '\0';
 657
 658		scnprintf(name, sizeof(name), "[%s]", line);
 659
 660		size = strtoul(sep + 1, &endptr, 0);
 661		if (*endptr != ' ' && *endptr != '\t')
 662			continue;
 663
 664		err = process_module(arg, name, start, size);
 665		if (err)
 666			break;
 667	}
 668out:
 669	free(line);
 670	fclose(file);
 671	return err;
 672}
 673
 674/*
 675 * These are symbols in the kernel image, so make sure that
 676 * sym is from a kernel DSO.
 677 */
 678static bool symbol__is_idle(const char *name)
 679{
 680	const char * const idle_symbols[] = {
 681		"acpi_idle_do_entry",
 682		"acpi_processor_ffh_cstate_enter",
 683		"arch_cpu_idle",
 684		"cpu_idle",
 685		"cpu_startup_entry",
 686		"idle_cpu",
 687		"intel_idle",
 688		"intel_idle_ibrs",
 689		"default_idle",
 690		"native_safe_halt",
 691		"enter_idle",
 692		"exit_idle",
 693		"mwait_idle",
 694		"mwait_idle_with_hints",
 695		"mwait_idle_with_hints.constprop.0",
 696		"poll_idle",
 697		"ppc64_runlatch_off",
 698		"pseries_dedicated_idle_sleep",
 699		"psw_idle",
 700		"psw_idle_exit",
 701		NULL
 702	};
 703	int i;
 704	static struct strlist *idle_symbols_list;
 705
 706	if (idle_symbols_list)
 707		return strlist__has_entry(idle_symbols_list, name);
 708
 709	idle_symbols_list = strlist__new(NULL, NULL);
 710
 711	for (i = 0; idle_symbols[i]; i++)
 712		strlist__add(idle_symbols_list, idle_symbols[i]);
 713
 714	return strlist__has_entry(idle_symbols_list, name);
 715}
 716
 717static int map__process_kallsym_symbol(void *arg, const char *name,
 718				       char type, u64 start)
 719{
 720	struct symbol *sym;
 721	struct dso *dso = arg;
 722	struct rb_root_cached *root = &dso->symbols;
 723
 724	if (!symbol_type__filter(type))
 725		return 0;
 726
 727	/* Ignore local symbols for ARM modules */
 728	if (name[0] == '$')
 729		return 0;
 730
 731	/*
 732	 * module symbols are not sorted so we add all
 733	 * symbols, setting length to 0, and rely on
 734	 * symbols__fixup_end() to fix it up.
 735	 */
 736	sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name);
 737	if (sym == NULL)
 738		return -ENOMEM;
 739	/*
 740	 * We will pass the symbols to the filter later, in
 741	 * map__split_kallsyms, when we have split the maps per module
 742	 */
 743	__symbols__insert(root, sym, !strchr(name, '['));
 744
 745	return 0;
 746}
 747
 748/*
 749 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 750 * so that we can in the next step set the symbol ->end address and then
 751 * call kernel_maps__split_kallsyms.
 752 */
 753static int dso__load_all_kallsyms(struct dso *dso, const char *filename)
 754{
 755	return kallsyms__parse(filename, dso, map__process_kallsym_symbol);
 756}
 757
 758static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso)
 759{
 760	struct map *curr_map;
 761	struct symbol *pos;
 762	int count = 0;
 763	struct rb_root_cached old_root = dso->symbols;
 764	struct rb_root_cached *root = &dso->symbols;
 765	struct rb_node *next = rb_first_cached(root);
 766
 767	if (!kmaps)
 768		return -1;
 769
 770	*root = RB_ROOT_CACHED;
 771
 772	while (next) {
 
 773		struct dso *curr_map_dso;
 774		char *module;
 775
 776		pos = rb_entry(next, struct symbol, rb_node);
 777		next = rb_next(&pos->rb_node);
 778
 779		rb_erase_cached(&pos->rb_node, &old_root);
 780		RB_CLEAR_NODE(&pos->rb_node);
 781		module = strchr(pos->name, '\t');
 782		if (module)
 783			*module = '\0';
 784
 785		curr_map = maps__find(kmaps, pos->start);
 786
 787		if (!curr_map) {
 788			symbol__delete(pos);
 789			continue;
 790		}
 791		curr_map_dso = map__dso(curr_map);
 792		pos->start -= map__start(curr_map) - map__pgoff(curr_map);
 793		if (pos->end > map__end(curr_map))
 794			pos->end = map__end(curr_map);
 795		if (pos->end)
 796			pos->end -= map__start(curr_map) - map__pgoff(curr_map);
 797		symbols__insert(&curr_map_dso->symbols, pos);
 798		++count;
 
 799	}
 800
 801	/* Symbols have been adjusted */
 802	dso->adjust_symbols = 1;
 803
 804	return count;
 805}
 806
 807/*
 808 * Split the symbols into maps, making sure there are no overlaps, i.e. the
 809 * kernel range is broken in several maps, named [kernel].N, as we don't have
 810 * the original ELF section names vmlinux have.
 811 */
 812static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta,
 813				struct map *initial_map)
 814{
 815	struct machine *machine;
 816	struct map *curr_map = initial_map;
 817	struct symbol *pos;
 818	int count = 0, moved = 0;
 819	struct rb_root_cached *root = &dso->symbols;
 820	struct rb_node *next = rb_first_cached(root);
 821	int kernel_range = 0;
 822	bool x86_64;
 823
 824	if (!kmaps)
 825		return -1;
 826
 827	machine = maps__machine(kmaps);
 828
 829	x86_64 = machine__is(machine, "x86_64");
 830
 831	while (next) {
 832		char *module;
 833
 834		pos = rb_entry(next, struct symbol, rb_node);
 835		next = rb_next(&pos->rb_node);
 836
 837		module = strchr(pos->name, '\t');
 838		if (module) {
 839			struct dso *curr_map_dso;
 840
 841			if (!symbol_conf.use_modules)
 842				goto discard_symbol;
 843
 844			*module++ = '\0';
 845			curr_map_dso = map__dso(curr_map);
 846			if (strcmp(curr_map_dso->short_name, module)) {
 847				if (!RC_CHK_EQUAL(curr_map, initial_map) &&
 848				    dso->kernel == DSO_SPACE__KERNEL_GUEST &&
 849				    machine__is_default_guest(machine)) {
 850					/*
 851					 * We assume all symbols of a module are
 852					 * continuous in * kallsyms, so curr_map
 853					 * points to a module and all its
 854					 * symbols are in its kmap. Mark it as
 855					 * loaded.
 856					 */
 857					dso__set_loaded(curr_map_dso);
 858				}
 859
 
 860				curr_map = maps__find_by_name(kmaps, module);
 861				if (curr_map == NULL) {
 862					pr_debug("%s/proc/{kallsyms,modules} "
 863					         "inconsistency while looking "
 864						 "for \"%s\" module!\n",
 865						 machine->root_dir, module);
 866					curr_map = initial_map;
 867					goto discard_symbol;
 868				}
 869				curr_map_dso = map__dso(curr_map);
 870				if (curr_map_dso->loaded &&
 871				    !machine__is_default_guest(machine))
 872					goto discard_symbol;
 873			}
 874			/*
 875			 * So that we look just like we get from .ko files,
 876			 * i.e. not prelinked, relative to initial_map->start.
 877			 */
 878			pos->start = map__map_ip(curr_map, pos->start);
 879			pos->end   = map__map_ip(curr_map, pos->end);
 880		} else if (x86_64 && is_entry_trampoline(pos->name)) {
 881			/*
 882			 * These symbols are not needed anymore since the
 883			 * trampoline maps refer to the text section and it's
 884			 * symbols instead. Avoid having to deal with
 885			 * relocations, and the assumption that the first symbol
 886			 * is the start of kernel text, by simply removing the
 887			 * symbols at this point.
 888			 */
 889			goto discard_symbol;
 890		} else if (curr_map != initial_map) {
 891			char dso_name[PATH_MAX];
 892			struct dso *ndso;
 893
 894			if (delta) {
 895				/* Kernel was relocated at boot time */
 896				pos->start -= delta;
 897				pos->end -= delta;
 898			}
 899
 900			if (count == 0) {
 901				curr_map = initial_map;
 
 902				goto add_symbol;
 903			}
 904
 905			if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
 906				snprintf(dso_name, sizeof(dso_name),
 907					"[guest.kernel].%d",
 908					kernel_range++);
 909			else
 910				snprintf(dso_name, sizeof(dso_name),
 911					"[kernel].%d",
 912					kernel_range++);
 913
 914			ndso = dso__new(dso_name);
 
 915			if (ndso == NULL)
 916				return -1;
 917
 918			ndso->kernel = dso->kernel;
 919
 920			curr_map = map__new2(pos->start, ndso);
 921			if (curr_map == NULL) {
 922				dso__put(ndso);
 923				return -1;
 924			}
 925
 926			map__set_mapping_type(curr_map, MAPPING_TYPE__IDENTITY);
 927			if (maps__insert(kmaps, curr_map)) {
 
 928				dso__put(ndso);
 929				return -1;
 930			}
 931			++kernel_range;
 932		} else if (delta) {
 933			/* Kernel was relocated at boot time */
 934			pos->start -= delta;
 935			pos->end -= delta;
 936		}
 937add_symbol:
 938		if (curr_map != initial_map) {
 939			struct dso *curr_map_dso = map__dso(curr_map);
 940
 941			rb_erase_cached(&pos->rb_node, root);
 942			symbols__insert(&curr_map_dso->symbols, pos);
 943			++moved;
 944		} else
 945			++count;
 946
 947		continue;
 948discard_symbol:
 949		rb_erase_cached(&pos->rb_node, root);
 950		symbol__delete(pos);
 951	}
 952
 953	if (curr_map != initial_map &&
 954	    dso->kernel == DSO_SPACE__KERNEL_GUEST &&
 955	    machine__is_default_guest(maps__machine(kmaps))) {
 956		dso__set_loaded(map__dso(curr_map));
 957	}
 958
 959	return count + moved;
 960}
 961
 962bool symbol__restricted_filename(const char *filename,
 963				 const char *restricted_filename)
 964{
 965	bool restricted = false;
 966
 967	if (symbol_conf.kptr_restrict) {
 968		char *r = realpath(filename, NULL);
 969
 970		if (r != NULL) {
 971			restricted = strcmp(r, restricted_filename) == 0;
 972			free(r);
 973			return restricted;
 974		}
 975	}
 976
 977	return restricted;
 978}
 979
 980struct module_info {
 981	struct rb_node rb_node;
 982	char *name;
 983	u64 start;
 984};
 985
 986static void add_module(struct module_info *mi, struct rb_root *modules)
 987{
 988	struct rb_node **p = &modules->rb_node;
 989	struct rb_node *parent = NULL;
 990	struct module_info *m;
 991
 992	while (*p != NULL) {
 993		parent = *p;
 994		m = rb_entry(parent, struct module_info, rb_node);
 995		if (strcmp(mi->name, m->name) < 0)
 996			p = &(*p)->rb_left;
 997		else
 998			p = &(*p)->rb_right;
 999	}
1000	rb_link_node(&mi->rb_node, parent, p);
1001	rb_insert_color(&mi->rb_node, modules);
1002}
1003
1004static void delete_modules(struct rb_root *modules)
1005{
1006	struct module_info *mi;
1007	struct rb_node *next = rb_first(modules);
1008
1009	while (next) {
1010		mi = rb_entry(next, struct module_info, rb_node);
1011		next = rb_next(&mi->rb_node);
1012		rb_erase(&mi->rb_node, modules);
1013		zfree(&mi->name);
1014		free(mi);
1015	}
1016}
1017
1018static struct module_info *find_module(const char *name,
1019				       struct rb_root *modules)
1020{
1021	struct rb_node *n = modules->rb_node;
1022
1023	while (n) {
1024		struct module_info *m;
1025		int cmp;
1026
1027		m = rb_entry(n, struct module_info, rb_node);
1028		cmp = strcmp(name, m->name);
1029		if (cmp < 0)
1030			n = n->rb_left;
1031		else if (cmp > 0)
1032			n = n->rb_right;
1033		else
1034			return m;
1035	}
1036
1037	return NULL;
1038}
1039
1040static int __read_proc_modules(void *arg, const char *name, u64 start,
1041			       u64 size __maybe_unused)
1042{
1043	struct rb_root *modules = arg;
1044	struct module_info *mi;
1045
1046	mi = zalloc(sizeof(struct module_info));
1047	if (!mi)
1048		return -ENOMEM;
1049
1050	mi->name = strdup(name);
1051	mi->start = start;
1052
1053	if (!mi->name) {
1054		free(mi);
1055		return -ENOMEM;
1056	}
1057
1058	add_module(mi, modules);
1059
1060	return 0;
1061}
1062
1063static int read_proc_modules(const char *filename, struct rb_root *modules)
1064{
1065	if (symbol__restricted_filename(filename, "/proc/modules"))
1066		return -1;
1067
1068	if (modules__parse(filename, modules, __read_proc_modules)) {
1069		delete_modules(modules);
1070		return -1;
1071	}
1072
1073	return 0;
1074}
1075
1076int compare_proc_modules(const char *from, const char *to)
1077{
1078	struct rb_root from_modules = RB_ROOT;
1079	struct rb_root to_modules = RB_ROOT;
1080	struct rb_node *from_node, *to_node;
1081	struct module_info *from_m, *to_m;
1082	int ret = -1;
1083
1084	if (read_proc_modules(from, &from_modules))
1085		return -1;
1086
1087	if (read_proc_modules(to, &to_modules))
1088		goto out_delete_from;
1089
1090	from_node = rb_first(&from_modules);
1091	to_node = rb_first(&to_modules);
1092	while (from_node) {
1093		if (!to_node)
1094			break;
1095
1096		from_m = rb_entry(from_node, struct module_info, rb_node);
1097		to_m = rb_entry(to_node, struct module_info, rb_node);
1098
1099		if (from_m->start != to_m->start ||
1100		    strcmp(from_m->name, to_m->name))
1101			break;
1102
1103		from_node = rb_next(from_node);
1104		to_node = rb_next(to_node);
1105	}
1106
1107	if (!from_node && !to_node)
1108		ret = 0;
1109
1110	delete_modules(&to_modules);
1111out_delete_from:
1112	delete_modules(&from_modules);
1113
1114	return ret;
1115}
1116
1117static int do_validate_kcore_modules_cb(struct map *old_map, void *data)
1118{
1119	struct rb_root *modules = data;
1120	struct module_info *mi;
1121	struct dso *dso;
1122
1123	if (!__map__is_kmodule(old_map))
1124		return 0;
1125
1126	dso = map__dso(old_map);
1127	/* Module must be in memory at the same address */
1128	mi = find_module(dso->short_name, modules);
1129	if (!mi || mi->start != map__start(old_map))
1130		return -EINVAL;
1131
1132	return 0;
1133}
1134
1135static int do_validate_kcore_modules(const char *filename, struct maps *kmaps)
1136{
1137	struct rb_root modules = RB_ROOT;
1138	int err;
1139
1140	err = read_proc_modules(filename, &modules);
1141	if (err)
1142		return err;
1143
1144	err = maps__for_each_map(kmaps, do_validate_kcore_modules_cb, &modules);
1145
1146	delete_modules(&modules);
1147	return err;
1148}
1149
1150/*
1151 * If kallsyms is referenced by name then we look for filename in the same
1152 * directory.
1153 */
1154static bool filename_from_kallsyms_filename(char *filename,
1155					    const char *base_name,
1156					    const char *kallsyms_filename)
1157{
1158	char *name;
1159
1160	strcpy(filename, kallsyms_filename);
1161	name = strrchr(filename, '/');
1162	if (!name)
1163		return false;
1164
1165	name += 1;
1166
1167	if (!strcmp(name, "kallsyms")) {
1168		strcpy(name, base_name);
1169		return true;
1170	}
1171
1172	return false;
1173}
1174
1175static int validate_kcore_modules(const char *kallsyms_filename,
1176				  struct map *map)
1177{
1178	struct maps *kmaps = map__kmaps(map);
1179	char modules_filename[PATH_MAX];
1180
1181	if (!kmaps)
1182		return -EINVAL;
1183
1184	if (!filename_from_kallsyms_filename(modules_filename, "modules",
1185					     kallsyms_filename))
1186		return -EINVAL;
1187
1188	if (do_validate_kcore_modules(modules_filename, kmaps))
1189		return -EINVAL;
1190
1191	return 0;
1192}
1193
1194static int validate_kcore_addresses(const char *kallsyms_filename,
1195				    struct map *map)
1196{
1197	struct kmap *kmap = map__kmap(map);
1198
1199	if (!kmap)
1200		return -EINVAL;
1201
1202	if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
1203		u64 start;
1204
1205		if (kallsyms__get_function_start(kallsyms_filename,
1206						 kmap->ref_reloc_sym->name, &start))
1207			return -ENOENT;
1208		if (start != kmap->ref_reloc_sym->addr)
1209			return -EINVAL;
1210	}
1211
1212	return validate_kcore_modules(kallsyms_filename, map);
1213}
1214
1215struct kcore_mapfn_data {
1216	struct dso *dso;
1217	struct list_head maps;
1218};
1219
1220static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1221{
1222	struct kcore_mapfn_data *md = data;
1223	struct map_list_node *list_node = map_list_node__new();
1224
1225	if (!list_node)
1226		return -ENOMEM;
1227
1228	list_node->map = map__new2(start, md->dso);
1229	if (!list_node->map) {
1230		free(list_node);
1231		return -ENOMEM;
1232	}
1233
1234	map__set_end(list_node->map, map__start(list_node->map) + len);
1235	map__set_pgoff(list_node->map, pgoff);
1236
1237	list_add(&list_node->node, &md->maps);
1238
1239	return 0;
1240}
1241
1242static bool remove_old_maps(struct map *map, void *data)
1243{
1244	const struct map *map_to_save = data;
1245
1246	/*
1247	 * We need to preserve eBPF maps even if they are covered by kcore,
1248	 * because we need to access eBPF dso for source data.
1249	 */
1250	return !RC_CHK_EQUAL(map, map_to_save) && !__map__is_bpf_prog(map);
1251}
1252
1253static int dso__load_kcore(struct dso *dso, struct map *map,
1254			   const char *kallsyms_filename)
1255{
1256	struct maps *kmaps = map__kmaps(map);
1257	struct kcore_mapfn_data md;
1258	struct map *replacement_map = NULL;
1259	struct machine *machine;
1260	bool is_64_bit;
1261	int err, fd;
1262	char kcore_filename[PATH_MAX];
1263	u64 stext;
1264
1265	if (!kmaps)
1266		return -EINVAL;
1267
1268	machine = maps__machine(kmaps);
1269
1270	/* This function requires that the map is the kernel map */
1271	if (!__map__is_kernel(map))
1272		return -EINVAL;
1273
1274	if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1275					     kallsyms_filename))
1276		return -EINVAL;
1277
1278	/* Modules and kernel must be present at their original addresses */
1279	if (validate_kcore_addresses(kallsyms_filename, map))
1280		return -EINVAL;
1281
1282	md.dso = dso;
1283	INIT_LIST_HEAD(&md.maps);
1284
1285	fd = open(kcore_filename, O_RDONLY);
1286	if (fd < 0) {
1287		pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n",
1288			 kcore_filename);
1289		return -EINVAL;
1290	}
1291
1292	/* Read new maps into temporary lists */
1293	err = file__read_maps(fd, map__prot(map) & PROT_EXEC, kcore_mapfn, &md,
1294			      &is_64_bit);
1295	if (err)
1296		goto out_err;
1297	dso->is_64_bit = is_64_bit;
1298
1299	if (list_empty(&md.maps)) {
1300		err = -EINVAL;
1301		goto out_err;
1302	}
1303
1304	/* Remove old maps */
1305	maps__remove_maps(kmaps, remove_old_maps, map);
1306	machine->trampolines_mapped = false;
1307
1308	/* Find the kernel map using the '_stext' symbol */
1309	if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) {
1310		u64 replacement_size = 0;
1311		struct map_list_node *new_node;
1312
1313		list_for_each_entry(new_node, &md.maps, node) {
1314			struct map *new_map = new_node->map;
1315			u64 new_size = map__size(new_map);
1316
1317			if (!(stext >= map__start(new_map) && stext < map__end(new_map)))
1318				continue;
1319
1320			/*
1321			 * On some architectures, ARM64 for example, the kernel
1322			 * text can get allocated inside of the vmalloc segment.
1323			 * Select the smallest matching segment, in case stext
1324			 * falls within more than one in the list.
1325			 */
1326			if (!replacement_map || new_size < replacement_size) {
1327				replacement_map = new_map;
1328				replacement_size = new_size;
1329			}
1330		}
1331	}
1332
1333	if (!replacement_map)
1334		replacement_map = list_entry(md.maps.next, struct map_list_node, node)->map;
1335
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1336	/* Add new maps */
1337	while (!list_empty(&md.maps)) {
1338		struct map_list_node *new_node = list_entry(md.maps.next, struct map_list_node, node);
1339		struct map *new_map = new_node->map;
1340
1341		list_del_init(&new_node->node);
1342
1343		if (RC_CHK_EQUAL(new_map, replacement_map)) {
1344			struct map *map_ref;
1345
1346			map__set_start(map, map__start(new_map));
1347			map__set_end(map, map__end(new_map));
1348			map__set_pgoff(map, map__pgoff(new_map));
1349			map__set_mapping_type(map, map__mapping_type(new_map));
1350			/* Ensure maps are correctly ordered */
1351			map_ref = map__get(map);
1352			maps__remove(kmaps, map_ref);
1353			err = maps__insert(kmaps, map_ref);
1354			map__put(map_ref);
1355			map__put(new_map);
1356			if (err)
1357				goto out_err;
1358		} else {
1359			/*
1360			 * Merge kcore map into existing maps,
1361			 * and ensure that current maps (eBPF)
1362			 * stay intact.
1363			 */
1364			if (maps__merge_in(kmaps, new_map)) {
1365				err = -EINVAL;
1366				goto out_err;
1367			}
1368		}
1369		free(new_node);
1370	}
1371
1372	if (machine__is(machine, "x86_64")) {
1373		u64 addr;
1374
1375		/*
1376		 * If one of the corresponding symbols is there, assume the
1377		 * entry trampoline maps are too.
1378		 */
1379		if (!kallsyms__get_function_start(kallsyms_filename,
1380						  ENTRY_TRAMPOLINE_NAME,
1381						  &addr))
1382			machine->trampolines_mapped = true;
1383	}
1384
1385	/*
1386	 * Set the data type and long name so that kcore can be read via
1387	 * dso__data_read_addr().
1388	 */
1389	if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1390		dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1391	else
1392		dso->binary_type = DSO_BINARY_TYPE__KCORE;
1393	dso__set_long_name(dso, strdup(kcore_filename), true);
1394
1395	close(fd);
1396
1397	if (map__prot(map) & PROT_EXEC)
1398		pr_debug("Using %s for kernel object code\n", kcore_filename);
1399	else
1400		pr_debug("Using %s for kernel data\n", kcore_filename);
1401
1402	return 0;
1403
1404out_err:
1405	while (!list_empty(&md.maps)) {
1406		struct map_list_node *list_node;
1407
1408		list_node = list_entry(md.maps.next, struct map_list_node, node);
1409		list_del_init(&list_node->node);
1410		map__zput(list_node->map);
1411		free(list_node);
1412	}
1413	close(fd);
1414	return err;
1415}
1416
1417/*
1418 * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1419 * delta based on the relocation reference symbol.
1420 */
1421static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta)
1422{
1423	u64 addr;
1424
1425	if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1426		return 0;
1427
1428	if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr))
1429		return -1;
1430
1431	*delta = addr - kmap->ref_reloc_sym->addr;
1432	return 0;
1433}
1434
1435int __dso__load_kallsyms(struct dso *dso, const char *filename,
1436			 struct map *map, bool no_kcore)
1437{
1438	struct kmap *kmap = map__kmap(map);
1439	u64 delta = 0;
1440
1441	if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1442		return -1;
1443
1444	if (!kmap || !kmap->kmaps)
1445		return -1;
1446
1447	if (dso__load_all_kallsyms(dso, filename) < 0)
1448		return -1;
1449
1450	if (kallsyms__delta(kmap, filename, &delta))
1451		return -1;
1452
1453	symbols__fixup_end(&dso->symbols, true);
1454	symbols__fixup_duplicate(&dso->symbols);
1455
1456	if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1457		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1458	else
1459		dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1460
1461	if (!no_kcore && !dso__load_kcore(dso, map, filename))
1462		return maps__split_kallsyms_for_kcore(kmap->kmaps, dso);
1463	else
1464		return maps__split_kallsyms(kmap->kmaps, dso, delta, map);
1465}
1466
1467int dso__load_kallsyms(struct dso *dso, const char *filename,
1468		       struct map *map)
1469{
1470	return __dso__load_kallsyms(dso, filename, map, false);
1471}
1472
1473static int dso__load_perf_map(const char *map_path, struct dso *dso)
1474{
1475	char *line = NULL;
1476	size_t n;
1477	FILE *file;
1478	int nr_syms = 0;
1479
1480	file = fopen(map_path, "r");
1481	if (file == NULL)
1482		goto out_failure;
1483
1484	while (!feof(file)) {
1485		u64 start, size;
1486		struct symbol *sym;
1487		int line_len, len;
1488
1489		line_len = getline(&line, &n, file);
1490		if (line_len < 0)
1491			break;
1492
1493		if (!line)
1494			goto out_failure;
1495
1496		line[--line_len] = '\0'; /* \n */
1497
1498		len = hex2u64(line, &start);
1499
1500		len++;
1501		if (len + 2 >= line_len)
1502			continue;
1503
1504		len += hex2u64(line + len, &size);
1505
1506		len++;
1507		if (len + 2 >= line_len)
1508			continue;
1509
1510		sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len);
1511
1512		if (sym == NULL)
1513			goto out_delete_line;
1514
1515		symbols__insert(&dso->symbols, sym);
1516		nr_syms++;
1517	}
1518
1519	free(line);
1520	fclose(file);
1521
1522	return nr_syms;
1523
1524out_delete_line:
1525	free(line);
1526out_failure:
1527	return -1;
1528}
1529
1530#ifdef HAVE_LIBBFD_SUPPORT
1531#define PACKAGE 'perf'
1532#include <bfd.h>
1533
1534static int bfd_symbols__cmpvalue(const void *a, const void *b)
1535{
1536	const asymbol *as = *(const asymbol **)a, *bs = *(const asymbol **)b;
1537
1538	if (bfd_asymbol_value(as) != bfd_asymbol_value(bs))
1539		return bfd_asymbol_value(as) - bfd_asymbol_value(bs);
1540
1541	return bfd_asymbol_name(as)[0] - bfd_asymbol_name(bs)[0];
1542}
1543
1544static int bfd2elf_binding(asymbol *symbol)
1545{
1546	if (symbol->flags & BSF_WEAK)
1547		return STB_WEAK;
1548	if (symbol->flags & BSF_GLOBAL)
1549		return STB_GLOBAL;
1550	if (symbol->flags & BSF_LOCAL)
1551		return STB_LOCAL;
1552	return -1;
1553}
1554
1555int dso__load_bfd_symbols(struct dso *dso, const char *debugfile)
1556{
1557	int err = -1;
1558	long symbols_size, symbols_count, i;
1559	asection *section;
1560	asymbol **symbols, *sym;
1561	struct symbol *symbol;
1562	bfd *abfd;
1563	u64 start, len;
1564
1565	abfd = bfd_openr(debugfile, NULL);
1566	if (!abfd)
1567		return -1;
1568
1569	if (!bfd_check_format(abfd, bfd_object)) {
1570		pr_debug2("%s: cannot read %s bfd file.\n", __func__,
1571			  dso->long_name);
1572		goto out_close;
1573	}
1574
1575	if (bfd_get_flavour(abfd) == bfd_target_elf_flavour)
1576		goto out_close;
1577
1578	symbols_size = bfd_get_symtab_upper_bound(abfd);
1579	if (symbols_size == 0) {
1580		bfd_close(abfd);
1581		return 0;
1582	}
1583
1584	if (symbols_size < 0)
1585		goto out_close;
1586
1587	symbols = malloc(symbols_size);
1588	if (!symbols)
1589		goto out_close;
1590
1591	symbols_count = bfd_canonicalize_symtab(abfd, symbols);
1592	if (symbols_count < 0)
1593		goto out_free;
1594
1595	section = bfd_get_section_by_name(abfd, ".text");
1596	if (section) {
1597		for (i = 0; i < symbols_count; ++i) {
1598			if (!strcmp(bfd_asymbol_name(symbols[i]), "__ImageBase") ||
1599			    !strcmp(bfd_asymbol_name(symbols[i]), "__image_base__"))
1600				break;
1601		}
1602		if (i < symbols_count) {
1603			/* PE symbols can only have 4 bytes, so use .text high bits */
1604			dso->text_offset = section->vma - (u32)section->vma;
1605			dso->text_offset += (u32)bfd_asymbol_value(symbols[i]);
1606			dso->text_end = (section->vma - dso->text_offset) + section->size;
1607		} else {
1608			dso->text_offset = section->vma - section->filepos;
1609			dso->text_end = section->filepos + section->size;
1610		}
1611	}
1612
1613	qsort(symbols, symbols_count, sizeof(asymbol *), bfd_symbols__cmpvalue);
1614
1615#ifdef bfd_get_section
1616#define bfd_asymbol_section bfd_get_section
1617#endif
1618	for (i = 0; i < symbols_count; ++i) {
1619		sym = symbols[i];
1620		section = bfd_asymbol_section(sym);
1621		if (bfd2elf_binding(sym) < 0)
1622			continue;
1623
1624		while (i + 1 < symbols_count &&
1625		       bfd_asymbol_section(symbols[i + 1]) == section &&
1626		       bfd2elf_binding(symbols[i + 1]) < 0)
1627			i++;
1628
1629		if (i + 1 < symbols_count &&
1630		    bfd_asymbol_section(symbols[i + 1]) == section)
1631			len = symbols[i + 1]->value - sym->value;
1632		else
1633			len = section->size - sym->value;
1634
1635		start = bfd_asymbol_value(sym) - dso->text_offset;
1636		symbol = symbol__new(start, len, bfd2elf_binding(sym), STT_FUNC,
1637				     bfd_asymbol_name(sym));
1638		if (!symbol)
1639			goto out_free;
1640
1641		symbols__insert(&dso->symbols, symbol);
1642	}
1643#ifdef bfd_get_section
1644#undef bfd_asymbol_section
1645#endif
1646
1647	symbols__fixup_end(&dso->symbols, false);
1648	symbols__fixup_duplicate(&dso->symbols);
1649	dso->adjust_symbols = 1;
1650
1651	err = 0;
1652out_free:
1653	free(symbols);
1654out_close:
1655	bfd_close(abfd);
1656	return err;
1657}
1658#endif
1659
1660static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1661					   enum dso_binary_type type)
1662{
1663	switch (type) {
1664	case DSO_BINARY_TYPE__JAVA_JIT:
1665	case DSO_BINARY_TYPE__DEBUGLINK:
1666	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1667	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1668	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
1669	case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO:
1670	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1671	case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1672		return !kmod && dso->kernel == DSO_SPACE__USER;
1673
1674	case DSO_BINARY_TYPE__KALLSYMS:
1675	case DSO_BINARY_TYPE__VMLINUX:
1676	case DSO_BINARY_TYPE__KCORE:
1677		return dso->kernel == DSO_SPACE__KERNEL;
1678
1679	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1680	case DSO_BINARY_TYPE__GUEST_VMLINUX:
1681	case DSO_BINARY_TYPE__GUEST_KCORE:
1682		return dso->kernel == DSO_SPACE__KERNEL_GUEST;
1683
1684	case DSO_BINARY_TYPE__GUEST_KMODULE:
1685	case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
1686	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
1687	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
1688		/*
1689		 * kernel modules know their symtab type - it's set when
1690		 * creating a module dso in machine__addnew_module_map().
1691		 */
1692		return kmod && dso->symtab_type == type;
1693
1694	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
1695	case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
1696		return true;
1697
1698	case DSO_BINARY_TYPE__BPF_PROG_INFO:
1699	case DSO_BINARY_TYPE__BPF_IMAGE:
1700	case DSO_BINARY_TYPE__OOL:
1701	case DSO_BINARY_TYPE__NOT_FOUND:
1702	default:
1703		return false;
1704	}
1705}
1706
1707/* Checks for the existence of the perf-<pid>.map file in two different
1708 * locations.  First, if the process is a separate mount namespace, check in
1709 * that namespace using the pid of the innermost pid namespace.  If's not in a
1710 * namespace, or the file can't be found there, try in the mount namespace of
1711 * the tracing process using our view of its pid.
1712 */
1713static int dso__find_perf_map(char *filebuf, size_t bufsz,
1714			      struct nsinfo **nsip)
1715{
1716	struct nscookie nsc;
1717	struct nsinfo *nsi;
1718	struct nsinfo *nnsi;
1719	int rc = -1;
1720
1721	nsi = *nsip;
1722
1723	if (nsinfo__need_setns(nsi)) {
1724		snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__nstgid(nsi));
1725		nsinfo__mountns_enter(nsi, &nsc);
1726		rc = access(filebuf, R_OK);
1727		nsinfo__mountns_exit(&nsc);
1728		if (rc == 0)
1729			return rc;
1730	}
1731
1732	nnsi = nsinfo__copy(nsi);
1733	if (nnsi) {
1734		nsinfo__put(nsi);
1735
1736		nsinfo__clear_need_setns(nnsi);
1737		snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__tgid(nnsi));
1738		*nsip = nnsi;
1739		rc = 0;
1740	}
1741
1742	return rc;
1743}
1744
1745int dso__load(struct dso *dso, struct map *map)
1746{
1747	char *name;
1748	int ret = -1;
1749	u_int i;
1750	struct machine *machine = NULL;
1751	char *root_dir = (char *) "";
1752	int ss_pos = 0;
1753	struct symsrc ss_[2];
1754	struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1755	bool kmod;
1756	bool perfmap;
1757	struct build_id bid;
1758	struct nscookie nsc;
1759	char newmapname[PATH_MAX];
1760	const char *map_path = dso->long_name;
1761
1762	mutex_lock(&dso->lock);
1763	perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0;
1764	if (perfmap) {
1765		if (dso->nsinfo && (dso__find_perf_map(newmapname,
1766		    sizeof(newmapname), &dso->nsinfo) == 0)) {
1767			map_path = newmapname;
1768		}
1769	}
1770
1771	nsinfo__mountns_enter(dso->nsinfo, &nsc);
1772
1773	/* check again under the dso->lock */
1774	if (dso__loaded(dso)) {
1775		ret = 1;
1776		goto out;
1777	}
1778
1779	kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1780		dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
1781		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE ||
1782		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
1783
1784	if (dso->kernel && !kmod) {
1785		if (dso->kernel == DSO_SPACE__KERNEL)
1786			ret = dso__load_kernel_sym(dso, map);
1787		else if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1788			ret = dso__load_guest_kernel_sym(dso, map);
1789
1790		machine = maps__machine(map__kmaps(map));
1791		if (machine__is(machine, "x86_64"))
1792			machine__map_x86_64_entry_trampolines(machine, dso);
1793		goto out;
1794	}
1795
1796	dso->adjust_symbols = 0;
1797
1798	if (perfmap) {
1799		ret = dso__load_perf_map(map_path, dso);
1800		dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1801					     DSO_BINARY_TYPE__NOT_FOUND;
1802		goto out;
1803	}
1804
1805	if (machine)
1806		root_dir = machine->root_dir;
1807
1808	name = malloc(PATH_MAX);
1809	if (!name)
1810		goto out;
1811
1812	/*
1813	 * Read the build id if possible. This is required for
1814	 * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
1815	 */
1816	if (!dso->has_build_id &&
1817	    is_regular_file(dso->long_name)) {
1818	    __symbol__join_symfs(name, PATH_MAX, dso->long_name);
1819		if (filename__read_build_id(name, &bid) > 0)
1820			dso__set_build_id(dso, &bid);
1821	}
1822
1823	/*
1824	 * Iterate over candidate debug images.
1825	 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1826	 * and/or opd section) for processing.
1827	 */
1828	for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1829		struct symsrc *ss = &ss_[ss_pos];
1830		bool next_slot = false;
1831		bool is_reg;
1832		bool nsexit;
1833		int bfdrc = -1;
1834		int sirc = -1;
1835
1836		enum dso_binary_type symtab_type = binary_type_symtab[i];
1837
1838		nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE ||
1839		    symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO);
1840
1841		if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1842			continue;
1843
1844		if (dso__read_binary_type_filename(dso, symtab_type,
1845						   root_dir, name, PATH_MAX))
1846			continue;
1847
1848		if (nsexit)
1849			nsinfo__mountns_exit(&nsc);
1850
1851		is_reg = is_regular_file(name);
1852		if (!is_reg && errno == ENOENT && dso->nsinfo) {
1853			char *new_name = dso__filename_with_chroot(dso, name);
1854			if (new_name) {
1855				is_reg = is_regular_file(new_name);
1856				strlcpy(name, new_name, PATH_MAX);
1857				free(new_name);
1858			}
1859		}
1860
1861#ifdef HAVE_LIBBFD_SUPPORT
1862		if (is_reg)
1863			bfdrc = dso__load_bfd_symbols(dso, name);
1864#endif
1865		if (is_reg && bfdrc < 0)
1866			sirc = symsrc__init(ss, dso, name, symtab_type);
1867
1868		if (nsexit)
1869			nsinfo__mountns_enter(dso->nsinfo, &nsc);
1870
1871		if (bfdrc == 0) {
1872			ret = 0;
1873			break;
1874		}
1875
1876		if (!is_reg || sirc < 0)
1877			continue;
1878
1879		if (!syms_ss && symsrc__has_symtab(ss)) {
1880			syms_ss = ss;
1881			next_slot = true;
1882			if (!dso->symsrc_filename)
1883				dso->symsrc_filename = strdup(name);
1884		}
1885
1886		if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1887			runtime_ss = ss;
1888			next_slot = true;
1889		}
1890
1891		if (next_slot) {
1892			ss_pos++;
1893
1894			if (syms_ss && runtime_ss)
1895				break;
1896		} else {
1897			symsrc__destroy(ss);
1898		}
1899
1900	}
1901
1902	if (!runtime_ss && !syms_ss)
1903		goto out_free;
1904
1905	if (runtime_ss && !syms_ss) {
1906		syms_ss = runtime_ss;
1907	}
1908
1909	/* We'll have to hope for the best */
1910	if (!runtime_ss && syms_ss)
1911		runtime_ss = syms_ss;
1912
1913	if (syms_ss)
1914		ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod);
1915	else
1916		ret = -1;
1917
1918	if (ret > 0) {
1919		int nr_plt;
1920
1921		nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss);
1922		if (nr_plt > 0)
1923			ret += nr_plt;
1924	}
1925
1926	for (; ss_pos > 0; ss_pos--)
1927		symsrc__destroy(&ss_[ss_pos - 1]);
1928out_free:
1929	free(name);
1930	if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1931		ret = 0;
1932out:
1933	dso__set_loaded(dso);
1934	mutex_unlock(&dso->lock);
1935	nsinfo__mountns_exit(&nsc);
1936
1937	return ret;
1938}
1939
 
 
 
 
1940int dso__load_vmlinux(struct dso *dso, struct map *map,
1941		      const char *vmlinux, bool vmlinux_allocated)
1942{
1943	int err = -1;
1944	struct symsrc ss;
1945	char symfs_vmlinux[PATH_MAX];
1946	enum dso_binary_type symtab_type;
1947
1948	if (vmlinux[0] == '/')
1949		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1950	else
1951		symbol__join_symfs(symfs_vmlinux, vmlinux);
1952
1953	if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1954		symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1955	else
1956		symtab_type = DSO_BINARY_TYPE__VMLINUX;
1957
1958	if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
 
 
1959		return -1;
 
1960
1961	/*
1962	 * dso__load_sym() may copy 'dso' which will result in the copies having
1963	 * an incorrect long name unless we set it here first.
1964	 */
1965	dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1966	if (dso->kernel == DSO_SPACE__KERNEL_GUEST)
1967		dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1968	else
1969		dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1970
1971	err = dso__load_sym(dso, map, &ss, &ss, 0);
1972	symsrc__destroy(&ss);
1973
1974	if (err > 0) {
1975		dso__set_loaded(dso);
1976		pr_debug("Using %s for symbols\n", symfs_vmlinux);
1977	}
1978
1979	return err;
1980}
1981
1982int dso__load_vmlinux_path(struct dso *dso, struct map *map)
1983{
1984	int i, err = 0;
1985	char *filename = NULL;
1986
1987	pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1988		 vmlinux_path__nr_entries + 1);
1989
1990	for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1991		err = dso__load_vmlinux(dso, map, vmlinux_path[i], false);
1992		if (err > 0)
1993			goto out;
1994	}
1995
1996	if (!symbol_conf.ignore_vmlinux_buildid)
1997		filename = dso__build_id_filename(dso, NULL, 0, false);
1998	if (filename != NULL) {
1999		err = dso__load_vmlinux(dso, map, filename, true);
2000		if (err > 0)
2001			goto out;
2002		free(filename);
2003	}
2004out:
2005	return err;
2006}
2007
2008static bool visible_dir_filter(const char *name, struct dirent *d)
2009{
2010	if (d->d_type != DT_DIR)
2011		return false;
2012	return lsdir_no_dot_filter(name, d);
2013}
2014
2015static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
2016{
2017	char kallsyms_filename[PATH_MAX];
2018	int ret = -1;
2019	struct strlist *dirs;
2020	struct str_node *nd;
2021
2022	dirs = lsdir(dir, visible_dir_filter);
2023	if (!dirs)
2024		return -1;
2025
2026	strlist__for_each_entry(nd, dirs) {
2027		scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
2028			  "%s/%s/kallsyms", dir, nd->s);
2029		if (!validate_kcore_addresses(kallsyms_filename, map)) {
2030			strlcpy(dir, kallsyms_filename, dir_sz);
2031			ret = 0;
2032			break;
2033		}
2034	}
2035
2036	strlist__delete(dirs);
2037
2038	return ret;
2039}
2040
2041/*
2042 * Use open(O_RDONLY) to check readability directly instead of access(R_OK)
2043 * since access(R_OK) only checks with real UID/GID but open() use effective
2044 * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO).
2045 */
2046static bool filename__readable(const char *file)
2047{
2048	int fd = open(file, O_RDONLY);
2049	if (fd < 0)
2050		return false;
2051	close(fd);
2052	return true;
2053}
2054
2055static char *dso__find_kallsyms(struct dso *dso, struct map *map)
2056{
2057	struct build_id bid;
2058	char sbuild_id[SBUILD_ID_SIZE];
2059	bool is_host = false;
2060	char path[PATH_MAX];
2061
2062	if (!dso->has_build_id) {
2063		/*
2064		 * Last resort, if we don't have a build-id and couldn't find
2065		 * any vmlinux file, try the running kernel kallsyms table.
2066		 */
2067		goto proc_kallsyms;
2068	}
2069
2070	if (sysfs__read_build_id("/sys/kernel/notes", &bid) == 0)
2071		is_host = dso__build_id_equal(dso, &bid);
2072
2073	/* Try a fast path for /proc/kallsyms if possible */
2074	if (is_host) {
2075		/*
2076		 * Do not check the build-id cache, unless we know we cannot use
2077		 * /proc/kcore or module maps don't match to /proc/kallsyms.
2078		 * To check readability of /proc/kcore, do not use access(R_OK)
2079		 * since /proc/kcore requires CAP_SYS_RAWIO to read and access
2080		 * can't check it.
2081		 */
2082		if (filename__readable("/proc/kcore") &&
2083		    !validate_kcore_addresses("/proc/kallsyms", map))
2084			goto proc_kallsyms;
2085	}
2086
2087	build_id__sprintf(&dso->bid, sbuild_id);
2088
2089	/* Find kallsyms in build-id cache with kcore */
2090	scnprintf(path, sizeof(path), "%s/%s/%s",
2091		  buildid_dir, DSO__NAME_KCORE, sbuild_id);
2092
2093	if (!find_matching_kcore(map, path, sizeof(path)))
2094		return strdup(path);
2095
2096	/* Use current /proc/kallsyms if possible */
2097	if (is_host) {
2098proc_kallsyms:
2099		return strdup("/proc/kallsyms");
2100	}
2101
2102	/* Finally, find a cache of kallsyms */
2103	if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) {
2104		pr_err("No kallsyms or vmlinux with build-id %s was found\n",
2105		       sbuild_id);
2106		return NULL;
2107	}
2108
2109	return strdup(path);
2110}
2111
2112static int dso__load_kernel_sym(struct dso *dso, struct map *map)
2113{
2114	int err;
2115	const char *kallsyms_filename = NULL;
2116	char *kallsyms_allocated_filename = NULL;
2117	char *filename = NULL;
2118
2119	/*
2120	 * Step 1: if the user specified a kallsyms or vmlinux filename, use
2121	 * it and only it, reporting errors to the user if it cannot be used.
2122	 *
2123	 * For instance, try to analyse an ARM perf.data file _without_ a
2124	 * build-id, or if the user specifies the wrong path to the right
2125	 * vmlinux file, obviously we can't fallback to another vmlinux (a
2126	 * x86_86 one, on the machine where analysis is being performed, say),
2127	 * or worse, /proc/kallsyms.
2128	 *
2129	 * If the specified file _has_ a build-id and there is a build-id
2130	 * section in the perf.data file, we will still do the expected
2131	 * validation in dso__load_vmlinux and will bail out if they don't
2132	 * match.
2133	 */
2134	if (symbol_conf.kallsyms_name != NULL) {
2135		kallsyms_filename = symbol_conf.kallsyms_name;
2136		goto do_kallsyms;
2137	}
2138
2139	if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
2140		return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false);
2141	}
2142
2143	/*
2144	 * Before checking on common vmlinux locations, check if it's
2145	 * stored as standard build id binary (not kallsyms) under
2146	 * .debug cache.
2147	 */
2148	if (!symbol_conf.ignore_vmlinux_buildid)
2149		filename = __dso__build_id_filename(dso, NULL, 0, false, false);
2150	if (filename != NULL) {
2151		err = dso__load_vmlinux(dso, map, filename, true);
2152		if (err > 0)
2153			return err;
2154		free(filename);
2155	}
2156
2157	if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
2158		err = dso__load_vmlinux_path(dso, map);
2159		if (err > 0)
2160			return err;
2161	}
2162
2163	/* do not try local files if a symfs was given */
2164	if (symbol_conf.symfs[0] != 0)
2165		return -1;
2166
2167	kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
2168	if (!kallsyms_allocated_filename)
2169		return -1;
2170
2171	kallsyms_filename = kallsyms_allocated_filename;
2172
2173do_kallsyms:
2174	err = dso__load_kallsyms(dso, kallsyms_filename, map);
2175	if (err > 0)
2176		pr_debug("Using %s for symbols\n", kallsyms_filename);
2177	free(kallsyms_allocated_filename);
2178
2179	if (err > 0 && !dso__is_kcore(dso)) {
2180		dso->binary_type = DSO_BINARY_TYPE__KALLSYMS;
2181		dso__set_long_name(dso, DSO__NAME_KALLSYMS, false);
2182		map__fixup_start(map);
2183		map__fixup_end(map);
2184	}
2185
2186	return err;
2187}
2188
2189static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map)
2190{
2191	int err;
2192	const char *kallsyms_filename;
2193	struct machine *machine = maps__machine(map__kmaps(map));
2194	char path[PATH_MAX];
2195
2196	if (machine->kallsyms_filename) {
2197		kallsyms_filename = machine->kallsyms_filename;
2198	} else if (machine__is_default_guest(machine)) {
2199		/*
2200		 * if the user specified a vmlinux filename, use it and only
2201		 * it, reporting errors to the user if it cannot be used.
2202		 * Or use file guest_kallsyms inputted by user on commandline
2203		 */
2204		if (symbol_conf.default_guest_vmlinux_name != NULL) {
2205			err = dso__load_vmlinux(dso, map,
2206						symbol_conf.default_guest_vmlinux_name,
2207						false);
2208			return err;
2209		}
2210
2211		kallsyms_filename = symbol_conf.default_guest_kallsyms;
2212		if (!kallsyms_filename)
2213			return -1;
2214	} else {
2215		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
2216		kallsyms_filename = path;
2217	}
2218
2219	err = dso__load_kallsyms(dso, kallsyms_filename, map);
2220	if (err > 0)
2221		pr_debug("Using %s for symbols\n", kallsyms_filename);
2222	if (err > 0 && !dso__is_kcore(dso)) {
2223		dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
2224		dso__set_long_name(dso, machine->mmap_name, false);
2225		map__fixup_start(map);
2226		map__fixup_end(map);
2227	}
2228
2229	return err;
2230}
2231
2232static void vmlinux_path__exit(void)
2233{
2234	while (--vmlinux_path__nr_entries >= 0)
2235		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
2236	vmlinux_path__nr_entries = 0;
2237
2238	zfree(&vmlinux_path);
2239}
2240
2241static const char * const vmlinux_paths[] = {
2242	"vmlinux",
2243	"/boot/vmlinux"
2244};
2245
2246static const char * const vmlinux_paths_upd[] = {
2247	"/boot/vmlinux-%s",
2248	"/usr/lib/debug/boot/vmlinux-%s",
2249	"/lib/modules/%s/build/vmlinux",
2250	"/usr/lib/debug/lib/modules/%s/vmlinux",
2251	"/usr/lib/debug/boot/vmlinux-%s.debug"
2252};
2253
2254static int vmlinux_path__add(const char *new_entry)
2255{
2256	vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry);
2257	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
2258		return -1;
2259	++vmlinux_path__nr_entries;
2260
2261	return 0;
2262}
2263
2264static int vmlinux_path__init(struct perf_env *env)
2265{
2266	struct utsname uts;
2267	char bf[PATH_MAX];
2268	char *kernel_version;
2269	unsigned int i;
2270
2271	vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) +
2272			      ARRAY_SIZE(vmlinux_paths_upd)));
2273	if (vmlinux_path == NULL)
2274		return -1;
2275
2276	for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++)
2277		if (vmlinux_path__add(vmlinux_paths[i]) < 0)
2278			goto out_fail;
2279
2280	/* only try kernel version if no symfs was given */
2281	if (symbol_conf.symfs[0] != 0)
2282		return 0;
2283
2284	if (env) {
2285		kernel_version = env->os_release;
2286	} else {
2287		if (uname(&uts) < 0)
2288			goto out_fail;
2289
2290		kernel_version = uts.release;
2291	}
2292
2293	for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) {
2294		snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version);
2295		if (vmlinux_path__add(bf) < 0)
2296			goto out_fail;
2297	}
2298
2299	return 0;
2300
2301out_fail:
2302	vmlinux_path__exit();
2303	return -1;
2304}
2305
2306int setup_list(struct strlist **list, const char *list_str,
2307		      const char *list_name)
2308{
2309	if (list_str == NULL)
2310		return 0;
2311
2312	*list = strlist__new(list_str, NULL);
2313	if (!*list) {
2314		pr_err("problems parsing %s list\n", list_name);
2315		return -1;
2316	}
2317
2318	symbol_conf.has_filter = true;
2319	return 0;
2320}
2321
2322int setup_intlist(struct intlist **list, const char *list_str,
2323		  const char *list_name)
2324{
2325	if (list_str == NULL)
2326		return 0;
2327
2328	*list = intlist__new(list_str);
2329	if (!*list) {
2330		pr_err("problems parsing %s list\n", list_name);
2331		return -1;
2332	}
2333	return 0;
2334}
2335
2336static int setup_addrlist(struct intlist **addr_list, struct strlist *sym_list)
2337{
2338	struct str_node *pos, *tmp;
2339	unsigned long val;
2340	char *sep;
2341	const char *end;
2342	int i = 0, err;
2343
2344	*addr_list = intlist__new(NULL);
2345	if (!*addr_list)
2346		return -1;
2347
2348	strlist__for_each_entry_safe(pos, tmp, sym_list) {
2349		errno = 0;
2350		val = strtoul(pos->s, &sep, 16);
2351		if (errno || (sep == pos->s))
2352			continue;
2353
2354		if (*sep != '\0') {
2355			end = pos->s + strlen(pos->s) - 1;
2356			while (end >= sep && isspace(*end))
2357				end--;
2358
2359			if (end >= sep)
2360				continue;
2361		}
2362
2363		err = intlist__add(*addr_list, val);
2364		if (err)
2365			break;
2366
2367		strlist__remove(sym_list, pos);
2368		i++;
2369	}
2370
2371	if (i == 0) {
2372		intlist__delete(*addr_list);
2373		*addr_list = NULL;
2374	}
2375
2376	return 0;
2377}
2378
2379static bool symbol__read_kptr_restrict(void)
2380{
2381	bool value = false;
2382	FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
2383
2384	if (fp != NULL) {
2385		char line[8];
2386
2387		if (fgets(line, sizeof(line), fp) != NULL)
2388			value = perf_cap__capable(CAP_SYSLOG) ?
2389					(atoi(line) >= 2) :
2390					(atoi(line) != 0);
2391
2392		fclose(fp);
2393	}
2394
2395	/* Per kernel/kallsyms.c:
2396	 * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG
2397	 */
2398	if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG))
2399		value = true;
2400
2401	return value;
2402}
2403
2404int symbol__annotation_init(void)
2405{
2406	if (symbol_conf.init_annotation)
2407		return 0;
2408
2409	if (symbol_conf.initialized) {
2410		pr_err("Annotation needs to be init before symbol__init()\n");
2411		return -1;
2412	}
2413
2414	symbol_conf.priv_size += sizeof(struct annotation);
2415	symbol_conf.init_annotation = true;
2416	return 0;
2417}
2418
2419int symbol__init(struct perf_env *env)
2420{
2421	const char *symfs;
2422
2423	if (symbol_conf.initialized)
2424		return 0;
2425
2426	symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
2427
2428	symbol__elf_init();
2429
2430	if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0)
2431		return -1;
2432
2433	if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
2434		pr_err("'.' is the only non valid --field-separator argument\n");
2435		return -1;
2436	}
2437
2438	if (setup_list(&symbol_conf.dso_list,
2439		       symbol_conf.dso_list_str, "dso") < 0)
2440		return -1;
2441
2442	if (setup_list(&symbol_conf.comm_list,
2443		       symbol_conf.comm_list_str, "comm") < 0)
2444		goto out_free_dso_list;
2445
2446	if (setup_intlist(&symbol_conf.pid_list,
2447		       symbol_conf.pid_list_str, "pid") < 0)
2448		goto out_free_comm_list;
2449
2450	if (setup_intlist(&symbol_conf.tid_list,
2451		       symbol_conf.tid_list_str, "tid") < 0)
2452		goto out_free_pid_list;
2453
2454	if (setup_list(&symbol_conf.sym_list,
2455		       symbol_conf.sym_list_str, "symbol") < 0)
2456		goto out_free_tid_list;
2457
2458	if (symbol_conf.sym_list &&
2459	    setup_addrlist(&symbol_conf.addr_list, symbol_conf.sym_list) < 0)
2460		goto out_free_sym_list;
2461
2462	if (setup_list(&symbol_conf.bt_stop_list,
2463		       symbol_conf.bt_stop_list_str, "symbol") < 0)
2464		goto out_free_sym_list;
2465
2466	/*
2467	 * A path to symbols of "/" is identical to ""
2468	 * reset here for simplicity.
2469	 */
2470	symfs = realpath(symbol_conf.symfs, NULL);
2471	if (symfs == NULL)
2472		symfs = symbol_conf.symfs;
2473	if (strcmp(symfs, "/") == 0)
2474		symbol_conf.symfs = "";
2475	if (symfs != symbol_conf.symfs)
2476		free((void *)symfs);
2477
2478	symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
2479
2480	symbol_conf.initialized = true;
2481	return 0;
2482
2483out_free_sym_list:
2484	strlist__delete(symbol_conf.sym_list);
2485	intlist__delete(symbol_conf.addr_list);
2486out_free_tid_list:
2487	intlist__delete(symbol_conf.tid_list);
2488out_free_pid_list:
2489	intlist__delete(symbol_conf.pid_list);
2490out_free_comm_list:
2491	strlist__delete(symbol_conf.comm_list);
2492out_free_dso_list:
2493	strlist__delete(symbol_conf.dso_list);
2494	return -1;
2495}
2496
2497void symbol__exit(void)
2498{
2499	if (!symbol_conf.initialized)
2500		return;
2501	strlist__delete(symbol_conf.bt_stop_list);
2502	strlist__delete(symbol_conf.sym_list);
2503	strlist__delete(symbol_conf.dso_list);
2504	strlist__delete(symbol_conf.comm_list);
2505	intlist__delete(symbol_conf.tid_list);
2506	intlist__delete(symbol_conf.pid_list);
2507	intlist__delete(symbol_conf.addr_list);
2508	vmlinux_path__exit();
2509	symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
2510	symbol_conf.bt_stop_list = NULL;
2511	symbol_conf.initialized = false;
2512}
2513
2514int symbol__config_symfs(const struct option *opt __maybe_unused,
2515			 const char *dir, int unset __maybe_unused)
2516{
2517	char *bf = NULL;
2518	int ret;
2519
2520	symbol_conf.symfs = strdup(dir);
2521	if (symbol_conf.symfs == NULL)
2522		return -ENOMEM;
2523
2524	/* skip the locally configured cache if a symfs is given, and
2525	 * config buildid dir to symfs/.debug
2526	 */
2527	ret = asprintf(&bf, "%s/%s", dir, ".debug");
2528	if (ret < 0)
2529		return -ENOMEM;
2530
2531	set_buildid_dir(bf);
2532
2533	free(bf);
2534	return 0;
2535}
2536
2537struct mem_info *mem_info__get(struct mem_info *mi)
2538{
2539	if (mi)
2540		refcount_inc(&mi->refcnt);
2541	return mi;
2542}
2543
2544void mem_info__put(struct mem_info *mi)
2545{
2546	if (mi && refcount_dec_and_test(&mi->refcnt)) {
2547		addr_map_symbol__exit(&mi->iaddr);
2548		addr_map_symbol__exit(&mi->daddr);
2549		free(mi);
2550	}
2551}
2552
2553struct mem_info *mem_info__new(void)
2554{
2555	struct mem_info *mi = zalloc(sizeof(*mi));
2556
2557	if (mi)
2558		refcount_set(&mi->refcnt, 1);
2559	return mi;
2560}
2561
2562/*
2563 * Checks that user supplied symbol kernel files are accessible because
2564 * the default mechanism for accessing elf files fails silently. i.e. if
2565 * debug syms for a build ID aren't found perf carries on normally. When
2566 * they are user supplied we should assume that the user doesn't want to
2567 * silently fail.
2568 */
2569int symbol__validate_sym_arguments(void)
2570{
2571	if (symbol_conf.vmlinux_name &&
2572	    access(symbol_conf.vmlinux_name, R_OK)) {
2573		pr_err("Invalid file: %s\n", symbol_conf.vmlinux_name);
2574		return -EINVAL;
2575	}
2576	if (symbol_conf.kallsyms_name &&
2577	    access(symbol_conf.kallsyms_name, R_OK)) {
2578		pr_err("Invalid file: %s\n", symbol_conf.kallsyms_name);
2579		return -EINVAL;
2580	}
2581	return 0;
2582}