1#include <dirent.h>
   2#include <errno.h>
   3#include <stdlib.h>
   4#include <stdio.h>
   5#include <string.h>
 
 
 
 
 
   6#include <sys/types.h>
   7#include <sys/stat.h>
   8#include <sys/param.h>
   9#include <fcntl.h>
  10#include <unistd.h>
  11#include <inttypes.h>
 
  12#include "build-id.h"
  13#include "util.h"
 
 
  14#include "debug.h"
 
  15#include "machine.h"
 
  16#include "symbol.h"
 
 
 
 
  17#include "strlist.h"
 
 
 
 
 
 
  18
  19#include <elf.h>
  20#include <limits.h>
  21#include <symbol/kallsyms.h>
  22#include <sys/utsname.h>
  23
  24static int dso__load_kernel_sym(struct dso *dso, struct map *map,
  25				symbol_filter_t filter);
  26static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
  27			symbol_filter_t filter);
  28int vmlinux_path__nr_entries;
  29char **vmlinux_path;
  30
  31struct symbol_conf symbol_conf = {
  32	.use_modules	  = true,
  33	.try_vmlinux_path = true,
  34	.annotate_src	  = true,
  35	.demangle	  = true,
  36	.symfs            = "",
 
 
 
 
 
 
 
  37};
  38
 
 
 
 
 
 
 
 
 
 
  39static enum dso_binary_type binary_type_symtab[] = {
  40	DSO_BINARY_TYPE__KALLSYMS,
  41	DSO_BINARY_TYPE__GUEST_KALLSYMS,
  42	DSO_BINARY_TYPE__JAVA_JIT,
  43	DSO_BINARY_TYPE__DEBUGLINK,
  44	DSO_BINARY_TYPE__BUILD_ID_CACHE,
 
  45	DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
  46	DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
  47	DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
  48	DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
  49	DSO_BINARY_TYPE__GUEST_KMODULE,
 
  50	DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
 
  51	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
 
  52	DSO_BINARY_TYPE__NOT_FOUND,
  53};
  54
  55#define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab)
  56
  57bool symbol_type__is_a(char symbol_type, enum map_type map_type)
  58{
  59	symbol_type = toupper(symbol_type);
  60
  61	switch (map_type) {
  62	case MAP__FUNCTION:
  63		return symbol_type == 'T' || symbol_type == 'W';
  64	case MAP__VARIABLE:
  65		return symbol_type == 'D';
  66	default:
  67		return false;
  68	}
  69}
  70
  71static int prefix_underscores_count(const char *str)
  72{
  73	const char *tail = str;
  74
  75	while (*tail == '_')
  76		tail++;
  77
  78	return tail - str;
  79}
  80
  81#define SYMBOL_A 0
  82#define SYMBOL_B 1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  83
  84static int choose_best_symbol(struct symbol *syma, struct symbol *symb)
  85{
  86	s64 a;
  87	s64 b;
  88	size_t na, nb;
  89
  90	/* Prefer a symbol with non zero length */
  91	a = syma->end - syma->start;
  92	b = symb->end - symb->start;
  93	if ((b == 0) && (a > 0))
  94		return SYMBOL_A;
  95	else if ((a == 0) && (b > 0))
  96		return SYMBOL_B;
  97
 
 
 
 
 
 
 
  98	/* Prefer a non weak symbol over a weak one */
  99	a = syma->binding == STB_WEAK;
 100	b = symb->binding == STB_WEAK;
 101	if (b && !a)
 102		return SYMBOL_A;
 103	if (a && !b)
 104		return SYMBOL_B;
 105
 106	/* Prefer a global symbol over a non global one */
 107	a = syma->binding == STB_GLOBAL;
 108	b = symb->binding == STB_GLOBAL;
 109	if (a && !b)
 110		return SYMBOL_A;
 111	if (b && !a)
 112		return SYMBOL_B;
 113
 114	/* Prefer a symbol with less underscores */
 115	a = prefix_underscores_count(syma->name);
 116	b = prefix_underscores_count(symb->name);
 117	if (b > a)
 118		return SYMBOL_A;
 119	else if (a > b)
 120		return SYMBOL_B;
 121
 122	/* Choose the symbol with the longest name */
 123	na = strlen(syma->name);
 124	nb = strlen(symb->name);
 125	if (na > nb)
 126		return SYMBOL_A;
 127	else if (na < nb)
 128		return SYMBOL_B;
 129
 130	/* Avoid "SyS" kernel syscall aliases */
 131	if (na >= 3 && !strncmp(syma->name, "SyS", 3))
 132		return SYMBOL_B;
 133	if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10))
 134		return SYMBOL_B;
 135
 136	return SYMBOL_A;
 137}
 138
 139void symbols__fixup_duplicate(struct rb_root *symbols)
 140{
 141	struct rb_node *nd;
 142	struct symbol *curr, *next;
 143
 144	nd = rb_first(symbols);
 
 
 
 145
 146	while (nd) {
 147		curr = rb_entry(nd, struct symbol, rb_node);
 148again:
 149		nd = rb_next(&curr->rb_node);
 150		next = rb_entry(nd, struct symbol, rb_node);
 151
 152		if (!nd)
 153			break;
 154
 
 155		if (curr->start != next->start)
 156			continue;
 157
 158		if (choose_best_symbol(curr, next) == SYMBOL_A) {
 159			rb_erase(&next->rb_node, symbols);
 
 
 160			symbol__delete(next);
 161			goto again;
 162		} else {
 
 
 163			nd = rb_next(&curr->rb_node);
 164			rb_erase(&curr->rb_node, symbols);
 165			symbol__delete(curr);
 166		}
 167	}
 168}
 169
 170void symbols__fixup_end(struct rb_root *symbols)
 
 171{
 172	struct rb_node *nd, *prevnd = rb_first(symbols);
 173	struct symbol *curr, *prev;
 174
 175	if (prevnd == NULL)
 176		return;
 177
 178	curr = rb_entry(prevnd, struct symbol, rb_node);
 179
 180	for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 181		prev = curr;
 182		curr = rb_entry(nd, struct symbol, rb_node);
 183
 184		if (prev->end == prev->start && prev->end != curr->start)
 185			prev->end = curr->start - 1;
 186	}
 187
 188	/* Last entry */
 189	if (curr->end == curr->start)
 190		curr->end = roundup(curr->start, 4096);
 191}
 192
 193void __map_groups__fixup_end(struct map_groups *mg, enum map_type type)
 194{
 195	struct map *prev, *curr;
 196	struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]);
 
 
 
 
 
 
 
 
 
 
 
 197
 198	if (prevnd == NULL)
 199		return;
 200
 201	curr = rb_entry(prevnd, struct map, rb_node);
 
 
 
 
 
 
 
 202
 203	for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
 204		prev = curr;
 205		curr = rb_entry(nd, struct map, rb_node);
 206		prev->end = curr->start - 1;
 207	}
 208
 209	/*
 210	 * We still haven't the actual symbols, so guess the
 211	 * last map final address.
 212	 */
 213	curr->end = ~0ULL;
 214}
 215
 216struct symbol *symbol__new(u64 start, u64 len, u8 binding, const char *name)
 217{
 218	size_t namelen = strlen(name) + 1;
 219	struct symbol *sym = calloc(1, (symbol_conf.priv_size +
 220					sizeof(*sym) + namelen));
 221	if (sym == NULL)
 222		return NULL;
 223
 224	if (symbol_conf.priv_size)
 
 
 
 
 225		sym = ((void *)sym) + symbol_conf.priv_size;
 
 226
 227	sym->start   = start;
 228	sym->end     = len ? start + len - 1 : start;
 
 229	sym->binding = binding;
 230	sym->namelen = namelen - 1;
 231
 232	pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n",
 233		  __func__, name, start, sym->end);
 234	memcpy(sym->name, name, namelen);
 235
 236	return sym;
 237}
 238
 239void symbol__delete(struct symbol *sym)
 240{
 241	free(((void *)sym) - symbol_conf.priv_size);
 242}
 
 243
 244size_t symbol__fprintf(struct symbol *sym, FILE *fp)
 245{
 246	return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n",
 247		       sym->start, sym->end,
 248		       sym->binding == STB_GLOBAL ? 'g' :
 249		       sym->binding == STB_LOCAL  ? 'l' : 'w',
 250		       sym->name);
 251}
 252
 253size_t symbol__fprintf_symname_offs(const struct symbol *sym,
 254				    const struct addr_location *al, FILE *fp)
 255{
 256	unsigned long offset;
 257	size_t length;
 258
 259	if (sym && sym->name) {
 260		length = fprintf(fp, "%s", sym->name);
 261		if (al) {
 262			if (al->addr < sym->end)
 263				offset = al->addr - sym->start;
 264			else
 265				offset = al->addr - al->map->start - sym->start;
 266			length += fprintf(fp, "+0x%lx", offset);
 267		}
 268		return length;
 269	} else
 270		return fprintf(fp, "[unknown]");
 271}
 272
 273size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp)
 274{
 275	return symbol__fprintf_symname_offs(sym, NULL, fp);
 276}
 277
 278void symbols__delete(struct rb_root *symbols)
 279{
 280	struct symbol *pos;
 281	struct rb_node *next = rb_first(symbols);
 282
 283	while (next) {
 284		pos = rb_entry(next, struct symbol, rb_node);
 285		next = rb_next(&pos->rb_node);
 286		rb_erase(&pos->rb_node, symbols);
 287		symbol__delete(pos);
 288	}
 289}
 290
 291void symbols__insert(struct rb_root *symbols, struct symbol *sym)
 
 292{
 293	struct rb_node **p = &symbols->rb_node;
 294	struct rb_node *parent = NULL;
 295	const u64 ip = sym->start;
 296	struct symbol *s;
 
 
 
 
 
 
 
 
 
 
 
 
 297
 298	while (*p != NULL) {
 299		parent = *p;
 300		s = rb_entry(parent, struct symbol, rb_node);
 301		if (ip < s->start)
 302			p = &(*p)->rb_left;
 303		else
 304			p = &(*p)->rb_right;
 
 
 305	}
 306	rb_link_node(&sym->rb_node, parent, p);
 307	rb_insert_color(&sym->rb_node, symbols);
 
 
 
 
 
 308}
 309
 310static struct symbol *symbols__find(struct rb_root *symbols, u64 ip)
 311{
 312	struct rb_node *n;
 313
 314	if (symbols == NULL)
 315		return NULL;
 316
 317	n = symbols->rb_node;
 318
 319	while (n) {
 320		struct symbol *s = rb_entry(n, struct symbol, rb_node);
 321
 322		if (ip < s->start)
 323			n = n->rb_left;
 324		else if (ip > s->end)
 325			n = n->rb_right;
 326		else
 327			return s;
 328	}
 329
 330	return NULL;
 331}
 332
 333static struct symbol *symbols__first(struct rb_root *symbols)
 334{
 335	struct rb_node *n = rb_first(symbols);
 336
 337	if (n)
 338		return rb_entry(n, struct symbol, rb_node);
 339
 340	return NULL;
 341}
 342
 343struct symbol_name_rb_node {
 344	struct rb_node	rb_node;
 345	struct symbol	sym;
 346};
 
 
 347
 348static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym)
 
 
 
 349{
 350	struct rb_node **p = &symbols->rb_node;
 351	struct rb_node *parent = NULL;
 352	struct symbol_name_rb_node *symn, *s;
 353
 354	symn = container_of(sym, struct symbol_name_rb_node, sym);
 
 355
 356	while (*p != NULL) {
 357		parent = *p;
 358		s = rb_entry(parent, struct symbol_name_rb_node, rb_node);
 359		if (strcmp(sym->name, s->sym.name) < 0)
 360			p = &(*p)->rb_left;
 361		else
 362			p = &(*p)->rb_right;
 363	}
 364	rb_link_node(&symn->rb_node, parent, p);
 365	rb_insert_color(&symn->rb_node, symbols);
 366}
 367
 368static void symbols__sort_by_name(struct rb_root *symbols,
 369				  struct rb_root *source)
 
 
 
 
 
 
 
 370{
 371	struct rb_node *nd;
 
 
 
 
 
 372
 373	for (nd = rb_first(source); nd; nd = rb_next(nd)) {
 
 
 
 
 374		struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
 375		symbols__insert_by_name(symbols, pos);
 
 376	}
 
 
 
 377}
 378
 379static struct symbol *symbols__find_by_name(struct rb_root *symbols,
 380					    const char *name)
 381{
 382	struct rb_node *n;
 383
 384	if (symbols == NULL)
 385		return NULL;
 
 386
 387	n = symbols->rb_node;
 
 388
 389	while (n) {
 390		struct symbol_name_rb_node *s;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 391		int cmp;
 392
 393		s = rb_entry(n, struct symbol_name_rb_node, rb_node);
 394		cmp = strcmp(name, s->sym.name);
 395
 396		if (cmp < 0)
 397			n = n->rb_left;
 398		else if (cmp > 0)
 399			n = n->rb_right;
 400		else
 401			return &s->sym;
 
 
 
 
 402	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 403
 404	return NULL;
 
 
 
 405}
 406
 407struct symbol *dso__find_symbol(struct dso *dso,
 408				enum map_type type, u64 addr)
 409{
 410	return symbols__find(&dso->symbols[type], addr);
 
 
 
 
 
 
 
 411}
 412
 413static struct symbol *dso__first_symbol(struct dso *dso, enum map_type type)
 414{
 415	return symbols__first(&dso->symbols[type]);
 
 
 416}
 417
 418struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
 419					const char *name)
 420{
 421	return symbols__find_by_name(&dso->symbol_names[type], name);
 
 
 
 
 
 422}
 423
 424void dso__sort_by_name(struct dso *dso, enum map_type type)
 425{
 426	dso__set_sorted_by_name(dso, type);
 427	return symbols__sort_by_name(&dso->symbol_names[type],
 428				     &dso->symbols[type]);
 429}
 430
 431size_t dso__fprintf_symbols_by_name(struct dso *dso,
 432				    enum map_type type, FILE *fp)
 433{
 434	size_t ret = 0;
 435	struct rb_node *nd;
 436	struct symbol_name_rb_node *pos;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 437
 438	for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) {
 439		pos = rb_entry(nd, struct symbol_name_rb_node, rb_node);
 440		fprintf(fp, "%s\n", pos->sym.name);
 
 
 441	}
 
 
 442
 443	return ret;
 
 
 
 
 
 
 
 
 
 
 444}
 445
 
 446int modules__parse(const char *filename, void *arg,
 447		   int (*process_module)(void *arg, const char *name,
 448					 u64 start))
 449{
 450	char *line = NULL;
 451	size_t n;
 452	FILE *file;
 453	int err = 0;
 454
 455	file = fopen(filename, "r");
 456	if (file == NULL)
 457		return -1;
 458
 459	while (1) {
 460		char name[PATH_MAX];
 461		u64 start;
 462		char *sep;
 463		ssize_t line_len;
 464
 465		line_len = getline(&line, &n, file);
 466		if (line_len < 0) {
 467			if (feof(file))
 468				break;
 469			err = -1;
 470			goto out;
 471		}
 472
 473		if (!line) {
 474			err = -1;
 475			goto out;
 476		}
 477
 478		line[--line_len] = '\0'; /* \n */
 479
 480		sep = strrchr(line, 'x');
 481		if (sep == NULL)
 482			continue;
 483
 484		hex2u64(sep + 1, &start);
 485
 486		sep = strchr(line, ' ');
 487		if (sep == NULL)
 488			continue;
 489
 490		*sep = '\0';
 491
 492		scnprintf(name, sizeof(name), "[%s]", line);
 493
 494		err = process_module(arg, name, start);
 
 
 
 
 495		if (err)
 496			break;
 497	}
 498out:
 499	free(line);
 500	fclose(file);
 501	return err;
 502}
 503
 504struct process_kallsyms_args {
 505	struct map *map;
 506	struct dso *dso;
 507};
 508
 509bool symbol__is_idle(struct symbol *sym)
 510{
 511	const char * const idle_symbols[] = {
 
 
 
 512		"cpu_idle",
 
 
 513		"intel_idle",
 
 514		"default_idle",
 515		"native_safe_halt",
 516		"enter_idle",
 517		"exit_idle",
 518		"mwait_idle",
 519		"mwait_idle_with_hints",
 
 520		"poll_idle",
 521		"ppc64_runlatch_off",
 522		"pseries_dedicated_idle_sleep",
 
 
 523		NULL
 524	};
 525
 526	int i;
 
 527
 528	if (!sym)
 529		return false;
 530
 531	for (i = 0; idle_symbols[i]; i++) {
 532		if (!strcmp(idle_symbols[i], sym->name))
 533			return true;
 534	}
 535
 536	return false;
 
 
 
 537}
 538
 539static int map__process_kallsym_symbol(void *arg, const char *name,
 540				       char type, u64 start)
 541{
 542	struct symbol *sym;
 543	struct process_kallsyms_args *a = arg;
 544	struct rb_root *root = &a->dso->symbols[a->map->type];
 
 
 
 545
 546	if (!symbol_type__is_a(type, a->map->type))
 
 547		return 0;
 548
 549	/*
 550	 * module symbols are not sorted so we add all
 551	 * symbols, setting length to 0, and rely on
 552	 * symbols__fixup_end() to fix it up.
 553	 */
 554	sym = symbol__new(start, 0, kallsyms2elf_type(type), name);
 555	if (sym == NULL)
 556		return -ENOMEM;
 557	/*
 558	 * We will pass the symbols to the filter later, in
 559	 * map__split_kallsyms, when we have split the maps per module
 560	 */
 561	symbols__insert(root, sym);
 562
 563	return 0;
 564}
 565
 566/*
 567 * Loads the function entries in /proc/kallsyms into kernel_map->dso,
 568 * so that we can in the next step set the symbol ->end address and then
 569 * call kernel_maps__split_kallsyms.
 570 */
 571static int dso__load_all_kallsyms(struct dso *dso, const char *filename,
 572				  struct map *map)
 573{
 574	struct process_kallsyms_args args = { .map = map, .dso = dso, };
 575	return kallsyms__parse(filename, &args, map__process_kallsym_symbol);
 576}
 577
 578static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map,
 579					 symbol_filter_t filter)
 580{
 581	struct map_groups *kmaps = map__kmap(map)->kmaps;
 582	struct map *curr_map;
 583	struct symbol *pos;
 584	int count = 0, moved = 0;
 585	struct rb_root *root = &dso->symbols[map->type];
 586	struct rb_node *next = rb_first(root);
 
 
 
 
 
 
 587
 588	while (next) {
 
 
 589		char *module;
 590
 591		pos = rb_entry(next, struct symbol, rb_node);
 592		next = rb_next(&pos->rb_node);
 593
 
 
 594		module = strchr(pos->name, '\t');
 595		if (module)
 596			*module = '\0';
 597
 598		curr_map = map_groups__find(kmaps, map->type, pos->start);
 599
 600		if (!curr_map || (filter && filter(curr_map, pos))) {
 601			rb_erase(&pos->rb_node, root);
 602			symbol__delete(pos);
 603		} else {
 604			pos->start -= curr_map->start - curr_map->pgoff;
 605			if (pos->end)
 606				pos->end -= curr_map->start - curr_map->pgoff;
 607			if (curr_map != map) {
 608				rb_erase(&pos->rb_node, root);
 609				symbols__insert(
 610					&curr_map->dso->symbols[curr_map->type],
 611					pos);
 612				++moved;
 613			} else {
 614				++count;
 615			}
 616		}
 
 
 
 
 
 
 
 
 
 617	}
 618
 619	/* Symbols have been adjusted */
 620	dso->adjust_symbols = 1;
 621
 622	return count + moved;
 623}
 624
 625/*
 626 * Split the symbols into maps, making sure there are no overlaps, i.e. the
 627 * kernel range is broken in several maps, named [kernel].N, as we don't have
 628 * the original ELF section names vmlinux have.
 629 */
 630static int dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta,
 631			       symbol_filter_t filter)
 632{
 633	struct map_groups *kmaps = map__kmap(map)->kmaps;
 634	struct machine *machine = kmaps->machine;
 635	struct map *curr_map = map;
 636	struct symbol *pos;
 637	int count = 0, moved = 0;	
 638	struct rb_root *root = &dso->symbols[map->type];
 639	struct rb_node *next = rb_first(root);
 640	int kernel_range = 0;
 
 
 
 
 
 
 
 
 641
 642	while (next) {
 643		char *module;
 644
 645		pos = rb_entry(next, struct symbol, rb_node);
 646		next = rb_next(&pos->rb_node);
 647
 648		module = strchr(pos->name, '\t');
 649		if (module) {
 
 
 650			if (!symbol_conf.use_modules)
 651				goto discard_symbol;
 652
 653			*module++ = '\0';
 654
 655			if (strcmp(curr_map->dso->short_name, module)) {
 656				if (curr_map != map &&
 657				    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 658				    machine__is_default_guest(machine)) {
 659					/*
 660					 * We assume all symbols of a module are
 661					 * continuous in * kallsyms, so curr_map
 662					 * points to a module and all its
 663					 * symbols are in its kmap. Mark it as
 664					 * loaded.
 665					 */
 666					dso__set_loaded(curr_map->dso,
 667							curr_map->type);
 668				}
 669
 670				curr_map = map_groups__find_by_name(kmaps,
 671							map->type, module);
 672				if (curr_map == NULL) {
 673					pr_debug("%s/proc/{kallsyms,modules} "
 674					         "inconsistency while looking "
 675						 "for \"%s\" module!\n",
 676						 machine->root_dir, module);
 677					curr_map = map;
 678					goto discard_symbol;
 679				}
 680
 681				if (curr_map->dso->loaded &&
 682				    !machine__is_default_guest(machine))
 683					goto discard_symbol;
 684			}
 685			/*
 686			 * So that we look just like we get from .ko files,
 687			 * i.e. not prelinked, relative to map->start.
 
 
 
 
 
 
 
 
 
 
 
 688			 */
 689			pos->start = curr_map->map_ip(curr_map, pos->start);
 690			pos->end   = curr_map->map_ip(curr_map, pos->end);
 691		} else if (curr_map != map) {
 692			char dso_name[PATH_MAX];
 693			struct dso *ndso;
 694
 695			if (delta) {
 696				/* Kernel was relocated at boot time */
 697				pos->start -= delta;
 698				pos->end -= delta;
 699			}
 700
 701			if (count == 0) {
 702				curr_map = map;
 703				goto filter_symbol;
 
 704			}
 705
 706			if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
 707				snprintf(dso_name, sizeof(dso_name),
 708					"[guest.kernel].%d",
 709					kernel_range++);
 710			else
 711				snprintf(dso_name, sizeof(dso_name),
 712					"[kernel].%d",
 713					kernel_range++);
 714
 715			ndso = dso__new(dso_name);
 
 716			if (ndso == NULL)
 717				return -1;
 718
 719			ndso->kernel = dso->kernel;
 720
 721			curr_map = map__new2(pos->start, ndso, map->type);
 722			if (curr_map == NULL) {
 723				dso__delete(ndso);
 724				return -1;
 725			}
 726
 727			curr_map->map_ip = curr_map->unmap_ip = identity__map_ip;
 728			map_groups__insert(kmaps, curr_map);
 
 
 
 
 729			++kernel_range;
 730		} else if (delta) {
 731			/* Kernel was relocated at boot time */
 732			pos->start -= delta;
 733			pos->end -= delta;
 734		}
 735filter_symbol:
 736		if (filter && filter(curr_map, pos)) {
 737discard_symbol:		rb_erase(&pos->rb_node, root);
 738			symbol__delete(pos);
 739		} else {
 740			if (curr_map != map) {
 741				rb_erase(&pos->rb_node, root);
 742				symbols__insert(&curr_map->dso->symbols[curr_map->type], pos);
 743				++moved;
 744			} else
 745				++count;
 746		}
 
 
 747	}
 748
 749	if (curr_map != map &&
 750	    dso->kernel == DSO_TYPE_GUEST_KERNEL &&
 751	    machine__is_default_guest(kmaps->machine)) {
 752		dso__set_loaded(curr_map->dso, curr_map->type);
 753	}
 754
 755	return count + moved;
 756}
 757
 758bool symbol__restricted_filename(const char *filename,
 759				 const char *restricted_filename)
 760{
 761	bool restricted = false;
 762
 763	if (symbol_conf.kptr_restrict) {
 764		char *r = realpath(filename, NULL);
 765
 766		if (r != NULL) {
 767			restricted = strcmp(r, restricted_filename) == 0;
 768			free(r);
 769			return restricted;
 770		}
 771	}
 772
 773	return restricted;
 774}
 775
 776struct module_info {
 777	struct rb_node rb_node;
 778	char *name;
 779	u64 start;
 780};
 781
 782static void add_module(struct module_info *mi, struct rb_root *modules)
 783{
 784	struct rb_node **p = &modules->rb_node;
 785	struct rb_node *parent = NULL;
 786	struct module_info *m;
 787
 788	while (*p != NULL) {
 789		parent = *p;
 790		m = rb_entry(parent, struct module_info, rb_node);
 791		if (strcmp(mi->name, m->name) < 0)
 792			p = &(*p)->rb_left;
 793		else
 794			p = &(*p)->rb_right;
 795	}
 796	rb_link_node(&mi->rb_node, parent, p);
 797	rb_insert_color(&mi->rb_node, modules);
 798}
 799
 800static void delete_modules(struct rb_root *modules)
 801{
 802	struct module_info *mi;
 803	struct rb_node *next = rb_first(modules);
 804
 805	while (next) {
 806		mi = rb_entry(next, struct module_info, rb_node);
 807		next = rb_next(&mi->rb_node);
 808		rb_erase(&mi->rb_node, modules);
 809		zfree(&mi->name);
 810		free(mi);
 811	}
 812}
 813
 814static struct module_info *find_module(const char *name,
 815				       struct rb_root *modules)
 816{
 817	struct rb_node *n = modules->rb_node;
 818
 819	while (n) {
 820		struct module_info *m;
 821		int cmp;
 822
 823		m = rb_entry(n, struct module_info, rb_node);
 824		cmp = strcmp(name, m->name);
 825		if (cmp < 0)
 826			n = n->rb_left;
 827		else if (cmp > 0)
 828			n = n->rb_right;
 829		else
 830			return m;
 831	}
 832
 833	return NULL;
 834}
 835
 836static int __read_proc_modules(void *arg, const char *name, u64 start)
 
 837{
 838	struct rb_root *modules = arg;
 839	struct module_info *mi;
 840
 841	mi = zalloc(sizeof(struct module_info));
 842	if (!mi)
 843		return -ENOMEM;
 844
 845	mi->name = strdup(name);
 846	mi->start = start;
 847
 848	if (!mi->name) {
 849		free(mi);
 850		return -ENOMEM;
 851	}
 852
 853	add_module(mi, modules);
 854
 855	return 0;
 856}
 857
 858static int read_proc_modules(const char *filename, struct rb_root *modules)
 859{
 860	if (symbol__restricted_filename(filename, "/proc/modules"))
 861		return -1;
 862
 863	if (modules__parse(filename, modules, __read_proc_modules)) {
 864		delete_modules(modules);
 865		return -1;
 866	}
 867
 868	return 0;
 869}
 870
 871int compare_proc_modules(const char *from, const char *to)
 872{
 873	struct rb_root from_modules = RB_ROOT;
 874	struct rb_root to_modules = RB_ROOT;
 875	struct rb_node *from_node, *to_node;
 876	struct module_info *from_m, *to_m;
 877	int ret = -1;
 878
 879	if (read_proc_modules(from, &from_modules))
 880		return -1;
 881
 882	if (read_proc_modules(to, &to_modules))
 883		goto out_delete_from;
 884
 885	from_node = rb_first(&from_modules);
 886	to_node = rb_first(&to_modules);
 887	while (from_node) {
 888		if (!to_node)
 889			break;
 890
 891		from_m = rb_entry(from_node, struct module_info, rb_node);
 892		to_m = rb_entry(to_node, struct module_info, rb_node);
 893
 894		if (from_m->start != to_m->start ||
 895		    strcmp(from_m->name, to_m->name))
 896			break;
 897
 898		from_node = rb_next(from_node);
 899		to_node = rb_next(to_node);
 900	}
 901
 902	if (!from_node && !to_node)
 903		ret = 0;
 904
 905	delete_modules(&to_modules);
 906out_delete_from:
 907	delete_modules(&from_modules);
 908
 909	return ret;
 910}
 911
 912static int do_validate_kcore_modules(const char *filename, struct map *map,
 913				  struct map_groups *kmaps)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 914{
 915	struct rb_root modules = RB_ROOT;
 916	struct map *old_map;
 917	int err;
 918
 919	err = read_proc_modules(filename, &modules);
 920	if (err)
 921		return err;
 922
 923	old_map = map_groups__first(kmaps, map->type);
 924	while (old_map) {
 925		struct map *next = map_groups__next(old_map);
 926		struct module_info *mi;
 927
 928		if (old_map == map || old_map->start == map->start) {
 929			/* The kernel map */
 930			old_map = next;
 931			continue;
 932		}
 933
 934		/* Module must be in memory at the same address */
 935		mi = find_module(old_map->dso->short_name, &modules);
 936		if (!mi || mi->start != old_map->start) {
 937			err = -EINVAL;
 938			goto out;
 939		}
 940
 941		old_map = next;
 942	}
 943out:
 944	delete_modules(&modules);
 945	return err;
 946}
 947
 948/*
 949 * If kallsyms is referenced by name then we look for filename in the same
 950 * directory.
 951 */
 952static bool filename_from_kallsyms_filename(char *filename,
 953					    const char *base_name,
 954					    const char *kallsyms_filename)
 955{
 956	char *name;
 957
 958	strcpy(filename, kallsyms_filename);
 959	name = strrchr(filename, '/');
 960	if (!name)
 961		return false;
 962
 963	name += 1;
 964
 965	if (!strcmp(name, "kallsyms")) {
 966		strcpy(name, base_name);
 967		return true;
 968	}
 969
 970	return false;
 971}
 972
 973static int validate_kcore_modules(const char *kallsyms_filename,
 974				  struct map *map)
 975{
 976	struct map_groups *kmaps = map__kmap(map)->kmaps;
 977	char modules_filename[PATH_MAX];
 978
 
 
 
 979	if (!filename_from_kallsyms_filename(modules_filename, "modules",
 980					     kallsyms_filename))
 981		return -EINVAL;
 982
 983	if (do_validate_kcore_modules(modules_filename, map, kmaps))
 984		return -EINVAL;
 985
 986	return 0;
 987}
 988
 989static int validate_kcore_addresses(const char *kallsyms_filename,
 990				    struct map *map)
 991{
 992	struct kmap *kmap = map__kmap(map);
 993
 
 
 
 994	if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) {
 995		u64 start;
 996
 997		start = kallsyms__get_function_start(kallsyms_filename,
 998						     kmap->ref_reloc_sym->name);
 
 999		if (start != kmap->ref_reloc_sym->addr)
1000			return -EINVAL;
1001	}
1002
1003	return validate_kcore_modules(kallsyms_filename, map);
1004}
1005
1006struct kcore_mapfn_data {
1007	struct dso *dso;
1008	enum map_type type;
1009	struct list_head maps;
1010};
1011
1012static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
1013{
1014	struct kcore_mapfn_data *md = data;
1015	struct map *map;
1016
1017	map = map__new2(start, md->dso, md->type);
1018	if (map == NULL)
1019		return -ENOMEM;
1020
1021	map->end = map->start + len;
1022	map->pgoff = pgoff;
 
 
 
1023
1024	list_add(&map->node, &md->maps);
 
 
 
1025
1026	return 0;
1027}
1028
 
 
 
 
 
 
 
 
 
 
 
1029static int dso__load_kcore(struct dso *dso, struct map *map,
1030			   const char *kallsyms_filename)
1031{
1032	struct map_groups *kmaps = map__kmap(map)->kmaps;
1033	struct machine *machine = kmaps->machine;
1034	struct kcore_mapfn_data md;
1035	struct map *old_map, *new_map, *replacement_map = NULL;
 
1036	bool is_64_bit;
1037	int err, fd;
1038	char kcore_filename[PATH_MAX];
1039	struct symbol *sym;
 
 
 
 
 
1040
1041	/* This function requires that the map is the kernel map */
1042	if (map != machine->vmlinux_maps[map->type])
1043		return -EINVAL;
1044
1045	if (!filename_from_kallsyms_filename(kcore_filename, "kcore",
1046					     kallsyms_filename))
1047		return -EINVAL;
1048
1049	/* Modules and kernel must be present at their original addresses */
1050	if (validate_kcore_addresses(kallsyms_filename, map))
1051		return -EINVAL;
1052
1053	md.dso = dso;
1054	md.type = map->type;
1055	INIT_LIST_HEAD(&md.maps);
1056
1057	fd = open(kcore_filename, O_RDONLY);
1058	if (fd < 0)
 
 
1059		return -EINVAL;
 
1060
1061	/* Read new maps into temporary lists */
1062	err = file__read_maps(fd, md.type == MAP__FUNCTION, kcore_mapfn, &md,
1063			      &is_64_bit);
1064	if (err)
1065		goto out_err;
 
1066
1067	if (list_empty(&md.maps)) {
1068		err = -EINVAL;
1069		goto out_err;
1070	}
1071
1072	/* Remove old maps */
1073	old_map = map_groups__first(kmaps, map->type);
1074	while (old_map) {
1075		struct map *next = map_groups__next(old_map);
1076
1077		if (old_map != map)
1078			map_groups__remove(kmaps, old_map);
1079		old_map = next;
1080	}
1081
1082	/* Find the kernel map using the first symbol */
1083	sym = dso__first_symbol(dso, map->type);
1084	list_for_each_entry(new_map, &md.maps, node) {
1085		if (sym && sym->start >= new_map->start &&
1086		    sym->start < new_map->end) {
1087			replacement_map = new_map;
1088			break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1089		}
1090	}
1091
1092	if (!replacement_map)
1093		replacement_map = list_entry(md.maps.next, struct map, node);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1094
1095	/* Add new maps */
1096	while (!list_empty(&md.maps)) {
1097		new_map = list_entry(md.maps.next, struct map, node);
1098		list_del(&new_map->node);
1099		if (new_map == replacement_map) {
1100			map->start	= new_map->start;
1101			map->end	= new_map->end;
1102			map->pgoff	= new_map->pgoff;
1103			map->map_ip	= new_map->map_ip;
1104			map->unmap_ip	= new_map->unmap_ip;
1105			map__delete(new_map);
1106			/* Ensure maps are correctly ordered */
1107			map_groups__remove(kmaps, map);
1108			map_groups__insert(kmaps, map);
1109		} else {
1110			map_groups__insert(kmaps, new_map);
 
 
1111		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1112	}
1113
1114	/*
1115	 * Set the data type and long name so that kcore can be read via
1116	 * dso__data_read_addr().
1117	 */
1118	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1119		dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE;
1120	else
1121		dso->binary_type = DSO_BINARY_TYPE__KCORE;
1122	dso__set_long_name(dso, strdup(kcore_filename), true);
1123
1124	close(fd);
1125
1126	if (map->type == MAP__FUNCTION)
1127		pr_debug("Using %s for kernel object code\n", kcore_filename);
1128	else
1129		pr_debug("Using %s for kernel data\n", kcore_filename);
1130
1131	return 0;
1132
1133out_err:
1134	while (!list_empty(&md.maps)) {
1135		map = list_entry(md.maps.next, struct map, node);
1136		list_del(&map->node);
1137		map__delete(map);
 
 
 
1138	}
1139	close(fd);
1140	return -EINVAL;
1141}
1142
1143/*
1144 * If the kernel is relocated at boot time, kallsyms won't match.  Compute the
1145 * delta based on the relocation reference symbol.
1146 */
1147static int kallsyms__delta(struct map *map, const char *filename, u64 *delta)
1148{
1149	struct kmap *kmap = map__kmap(map);
1150	u64 addr;
1151
1152	if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name)
1153		return 0;
1154
1155	addr = kallsyms__get_function_start(filename,
1156					    kmap->ref_reloc_sym->name);
1157	if (!addr)
1158		return -1;
1159
1160	*delta = addr - kmap->ref_reloc_sym->addr;
1161	return 0;
1162}
1163
1164int dso__load_kallsyms(struct dso *dso, const char *filename,
1165		       struct map *map, symbol_filter_t filter)
1166{
 
1167	u64 delta = 0;
1168
1169	if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1170		return -1;
1171
1172	if (dso__load_all_kallsyms(dso, filename, map) < 0)
 
 
 
1173		return -1;
1174
1175	if (kallsyms__delta(map, filename, &delta))
1176		return -1;
1177
1178	symbols__fixup_duplicate(&dso->symbols[map->type]);
1179	symbols__fixup_end(&dso->symbols[map->type]);
1180
1181	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1182		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;
1183	else
1184		dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS;
1185
1186	if (!dso__load_kcore(dso, map, filename))
1187		return dso__split_kallsyms_for_kcore(dso, map, filter);
1188	else
1189		return dso__split_kallsyms(dso, map, delta, filter);
 
 
 
 
 
 
1190}
1191
1192static int dso__load_perf_map(struct dso *dso, struct map *map,
1193			      symbol_filter_t filter)
1194{
1195	char *line = NULL;
1196	size_t n;
1197	FILE *file;
1198	int nr_syms = 0;
1199
1200	file = fopen(dso->long_name, "r");
1201	if (file == NULL)
1202		goto out_failure;
1203
1204	while (!feof(file)) {
1205		u64 start, size;
1206		struct symbol *sym;
1207		int line_len, len;
1208
1209		line_len = getline(&line, &n, file);
1210		if (line_len < 0)
1211			break;
1212
1213		if (!line)
1214			goto out_failure;
1215
1216		line[--line_len] = '\0'; /* \n */
1217
1218		len = hex2u64(line, &start);
1219
1220		len++;
1221		if (len + 2 >= line_len)
1222			continue;
1223
1224		len += hex2u64(line + len, &size);
1225
1226		len++;
1227		if (len + 2 >= line_len)
1228			continue;
1229
1230		sym = symbol__new(start, size, STB_GLOBAL, line + len);
1231
1232		if (sym == NULL)
1233			goto out_delete_line;
1234
1235		if (filter && filter(map, sym))
1236			symbol__delete(sym);
1237		else {
1238			symbols__insert(&dso->symbols[map->type], sym);
1239			nr_syms++;
1240		}
1241	}
1242
1243	free(line);
1244	fclose(file);
1245
1246	return nr_syms;
1247
1248out_delete_line:
1249	free(line);
1250out_failure:
1251	return -1;
1252}
1253
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1254static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
1255					   enum dso_binary_type type)
1256{
1257	switch (type) {
1258	case DSO_BINARY_TYPE__JAVA_JIT:
1259	case DSO_BINARY_TYPE__DEBUGLINK:
1260	case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
1261	case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
1262	case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
 
1263	case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
1264	case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
1265		return !kmod && dso->kernel == DSO_TYPE_USER;
1266
1267	case DSO_BINARY_TYPE__KALLSYMS:
1268	case DSO_BINARY_TYPE__VMLINUX:
1269	case DSO_BINARY_TYPE__KCORE:
1270		return dso->kernel == DSO_TYPE_KERNEL;
1271
1272	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
1273	case DSO_BINARY_TYPE__GUEST_VMLINUX:
1274	case DSO_BINARY_TYPE__GUEST_KCORE:
1275		return dso->kernel == DSO_TYPE_GUEST_KERNEL;
1276
1277	case DSO_BINARY_TYPE__GUEST_KMODULE:
 
1278	case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
 
1279		/*
1280		 * kernel modules know their symtab type - it's set when
1281		 * creating a module dso in machine__new_module().
1282		 */
1283		return kmod && dso->symtab_type == type;
1284
1285	case DSO_BINARY_TYPE__BUILD_ID_CACHE:
 
1286		return true;
1287
 
 
 
1288	case DSO_BINARY_TYPE__NOT_FOUND:
1289	default:
1290		return false;
1291	}
1292}
1293
1294int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1295{
1296	char *name;
1297	int ret = -1;
1298	u_int i;
1299	struct machine *machine;
1300	char *root_dir = (char *) "";
1301	int ss_pos = 0;
1302	struct symsrc ss_[2];
1303	struct symsrc *syms_ss = NULL, *runtime_ss = NULL;
1304	bool kmod;
 
 
 
 
 
1305
1306	dso__set_loaded(dso, map->type);
 
1307
1308	if (dso->kernel == DSO_TYPE_KERNEL)
1309		return dso__load_kernel_sym(dso, map, filter);
1310	else if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1311		return dso__load_guest_kernel_sym(dso, map, filter);
 
 
 
1312
1313	if (map->groups && map->groups->machine)
1314		machine = map->groups->machine;
1315	else
1316		machine = NULL;
1317
1318	dso->adjust_symbols = 0;
 
 
 
 
1319
1320	if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
1321		struct stat st;
1322
1323		if (lstat(dso->name, &st) < 0)
1324			return -1;
 
 
 
1325
1326		if (st.st_uid && (st.st_uid != geteuid())) {
1327			pr_warning("File %s not owned by current user or root, "
1328				"ignoring it.\n", dso->name);
1329			return -1;
1330		}
 
 
1331
1332		ret = dso__load_perf_map(dso, map, filter);
1333		dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT :
1334					     DSO_BINARY_TYPE__NOT_FOUND;
1335		return ret;
 
 
1336	}
1337
1338	if (machine)
1339		root_dir = machine->root_dir;
1340
1341	name = malloc(PATH_MAX);
1342	if (!name)
1343		return -1;
1344
1345	kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1346		dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
 
 
 
 
 
 
 
 
1347
1348	/*
1349	 * Iterate over candidate debug images.
1350	 * Keep track of "interesting" ones (those which have a symtab, dynsym,
1351	 * and/or opd section) for processing.
1352	 */
1353	for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) {
1354		struct symsrc *ss = &ss_[ss_pos];
1355		bool next_slot = false;
 
 
 
 
1356
1357		enum dso_binary_type symtab_type = binary_type_symtab[i];
1358
 
 
 
1359		if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type))
1360			continue;
1361
1362		if (dso__read_binary_type_filename(dso, symtab_type,
1363						   root_dir, name, PATH_MAX))
1364			continue;
1365
1366		/* Name is now the name of the next image to try */
1367		if (symsrc__init(ss, dso, name, symtab_type) < 0)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1368			continue;
1369
1370		if (!syms_ss && symsrc__has_symtab(ss)) {
1371			syms_ss = ss;
1372			next_slot = true;
1373			if (!dso->symsrc_filename)
1374				dso->symsrc_filename = strdup(name);
1375		}
1376
1377		if (!runtime_ss && symsrc__possibly_runtime(ss)) {
1378			runtime_ss = ss;
1379			next_slot = true;
1380		}
1381
1382		if (next_slot) {
1383			ss_pos++;
1384
 
 
 
1385			if (syms_ss && runtime_ss)
1386				break;
1387		} else {
1388			symsrc__destroy(ss);
1389		}
1390
1391	}
1392
1393	if (!runtime_ss && !syms_ss)
1394		goto out_free;
1395
1396	if (runtime_ss && !syms_ss) {
1397		syms_ss = runtime_ss;
1398	}
1399
1400	/* We'll have to hope for the best */
1401	if (!runtime_ss && syms_ss)
1402		runtime_ss = syms_ss;
1403
1404	if (syms_ss)
1405		ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, kmod);
1406	else
1407		ret = -1;
1408
1409	if (ret > 0) {
1410		int nr_plt;
1411
1412		nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter);
1413		if (nr_plt > 0)
1414			ret += nr_plt;
1415	}
1416
1417	for (; ss_pos > 0; ss_pos--)
1418		symsrc__destroy(&ss_[ss_pos - 1]);
1419out_free:
1420	free(name);
1421	if (ret < 0 && strstr(dso->name, " (deleted)") != NULL)
1422		return 0;
1423	return ret;
1424}
1425
1426struct map *map_groups__find_by_name(struct map_groups *mg,
1427				     enum map_type type, const char *name)
1428{
1429	struct rb_node *nd;
1430
1431	for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) {
1432		struct map *map = rb_entry(nd, struct map, rb_node);
1433
1434		if (map->dso && strcmp(map->dso->short_name, name) == 0)
1435			return map;
1436	}
1437
1438	return NULL;
1439}
1440
 
 
 
 
1441int dso__load_vmlinux(struct dso *dso, struct map *map,
1442		      const char *vmlinux, bool vmlinux_allocated,
1443		      symbol_filter_t filter)
1444{
1445	int err = -1;
1446	struct symsrc ss;
1447	char symfs_vmlinux[PATH_MAX];
1448	enum dso_binary_type symtab_type;
1449
1450	if (vmlinux[0] == '/')
1451		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux);
1452	else
1453		snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s",
1454			 symbol_conf.symfs, vmlinux);
1455
1456	if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1457		symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1458	else
1459		symtab_type = DSO_BINARY_TYPE__VMLINUX;
1460
1461	if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type))
 
 
1462		return -1;
 
 
 
 
 
 
 
 
 
 
 
1463
1464	err = dso__load_sym(dso, map, &ss, &ss, filter, 0);
1465	symsrc__destroy(&ss);
1466
1467	if (err > 0) {
1468		if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
1469			dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX;
1470		else
1471			dso->binary_type = DSO_BINARY_TYPE__VMLINUX;
1472		dso__set_long_name(dso, vmlinux, vmlinux_allocated);
1473		dso__set_loaded(dso, map->type);
1474		pr_debug("Using %s for symbols\n", symfs_vmlinux);
1475	}
1476
1477	return err;
1478}
1479
1480int dso__load_vmlinux_path(struct dso *dso, struct map *map,
1481			   symbol_filter_t filter)
1482{
1483	int i, err = 0;
1484	char *filename;
1485
1486	pr_debug("Looking at the vmlinux_path (%d entries long)\n",
1487		 vmlinux_path__nr_entries + 1);
1488
1489	filename = dso__build_id_filename(dso, NULL, 0);
1490	if (filename != NULL) {
1491		err = dso__load_vmlinux(dso, map, filename, true, filter);
1492		if (err > 0)
1493			goto out;
1494		free(filename);
1495	}
1496
1497	for (i = 0; i < vmlinux_path__nr_entries; ++i) {
1498		err = dso__load_vmlinux(dso, map, vmlinux_path[i], false, filter);
 
 
1499		if (err > 0)
1500			break;
1501	}
1502out:
1503	return err;
1504}
1505
 
 
 
 
 
 
 
1506static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
1507{
1508	char kallsyms_filename[PATH_MAX];
1509	struct dirent *dent;
1510	int ret = -1;
1511	DIR *d;
 
1512
1513	d = opendir(dir);
1514	if (!d)
1515		return -1;
1516
1517	while (1) {
1518		dent = readdir(d);
1519		if (!dent)
1520			break;
1521		if (dent->d_type != DT_DIR)
1522			continue;
1523		scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
1524			  "%s/%s/kallsyms", dir, dent->d_name);
1525		if (!validate_kcore_addresses(kallsyms_filename, map)) {
1526			strlcpy(dir, kallsyms_filename, dir_sz);
1527			ret = 0;
1528			break;
1529		}
1530	}
1531
1532	closedir(d);
1533
1534	return ret;
1535}
1536
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1537static char *dso__find_kallsyms(struct dso *dso, struct map *map)
1538{
1539	u8 host_build_id[BUILD_ID_SIZE];
1540	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
1541	bool is_host = false;
1542	char path[PATH_MAX];
1543
1544	if (!dso->has_build_id) {
1545		/*
1546		 * Last resort, if we don't have a build-id and couldn't find
1547		 * any vmlinux file, try the running kernel kallsyms table.
1548		 */
1549		goto proc_kallsyms;
1550	}
1551
1552	if (sysfs__read_build_id("/sys/kernel/notes", host_build_id,
1553				 sizeof(host_build_id)) == 0)
1554		is_host = dso__build_id_equal(dso, host_build_id);
1555
1556	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1557
1558	scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir,
1559		  sbuild_id);
1560
1561	/* Use /proc/kallsyms if possible */
1562	if (is_host) {
1563		DIR *d;
1564		int fd;
1565
1566		/* If no cached kcore go with /proc/kallsyms */
1567		d = opendir(path);
1568		if (!d)
1569			goto proc_kallsyms;
1570		closedir(d);
1571
1572		/*
1573		 * Do not check the build-id cache, until we know we cannot use
1574		 * /proc/kcore.
 
 
 
1575		 */
1576		fd = open("/proc/kcore", O_RDONLY);
1577		if (fd != -1) {
1578			close(fd);
1579			/* If module maps match go with /proc/kallsyms */
1580			if (!validate_kcore_addresses("/proc/kallsyms", map))
1581				goto proc_kallsyms;
1582		}
1583
1584		/* Find kallsyms in build-id cache with kcore */
1585		if (!find_matching_kcore(map, path, sizeof(path)))
1586			return strdup(path);
1587
1588		goto proc_kallsyms;
1589	}
1590
 
 
1591	/* Find kallsyms in build-id cache with kcore */
 
 
 
1592	if (!find_matching_kcore(map, path, sizeof(path)))
1593		return strdup(path);
1594
1595	scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s",
1596		  buildid_dir, sbuild_id);
 
 
 
1597
1598	if (access(path, F_OK)) {
 
1599		pr_err("No kallsyms or vmlinux with build-id %s was found\n",
1600		       sbuild_id);
1601		return NULL;
1602	}
1603
1604	return strdup(path);
1605
1606proc_kallsyms:
1607	return strdup("/proc/kallsyms");
1608}
1609
1610static int dso__load_kernel_sym(struct dso *dso, struct map *map,
1611				symbol_filter_t filter)
1612{
1613	int err;
1614	const char *kallsyms_filename = NULL;
1615	char *kallsyms_allocated_filename = NULL;
 
 
1616	/*
1617	 * Step 1: if the user specified a kallsyms or vmlinux filename, use
1618	 * it and only it, reporting errors to the user if it cannot be used.
1619	 *
1620	 * For instance, try to analyse an ARM perf.data file _without_ a
1621	 * build-id, or if the user specifies the wrong path to the right
1622	 * vmlinux file, obviously we can't fallback to another vmlinux (a
1623	 * x86_86 one, on the machine where analysis is being performed, say),
1624	 * or worse, /proc/kallsyms.
1625	 *
1626	 * If the specified file _has_ a build-id and there is a build-id
1627	 * section in the perf.data file, we will still do the expected
1628	 * validation in dso__load_vmlinux and will bail out if they don't
1629	 * match.
1630	 */
1631	if (symbol_conf.kallsyms_name != NULL) {
1632		kallsyms_filename = symbol_conf.kallsyms_name;
1633		goto do_kallsyms;
1634	}
1635
1636	if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) {
1637		return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name,
1638					 false, filter);
 
 
 
 
 
 
 
 
 
 
 
 
1639	}
1640
1641	if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) {
1642		err = dso__load_vmlinux_path(dso, map, filter);
1643		if (err > 0)
1644			return err;
1645	}
1646
1647	/* do not try local files if a symfs was given */
1648	if (symbol_conf.symfs[0] != 0)
1649		return -1;
1650
1651	kallsyms_allocated_filename = dso__find_kallsyms(dso, map);
1652	if (!kallsyms_allocated_filename)
1653		return -1;
1654
1655	kallsyms_filename = kallsyms_allocated_filename;
1656
1657do_kallsyms:
1658	err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1659	if (err > 0)
1660		pr_debug("Using %s for symbols\n", kallsyms_filename);
1661	free(kallsyms_allocated_filename);
1662
1663	if (err > 0 && !dso__is_kcore(dso)) {
1664		dso__set_long_name(dso, "[kernel.kallsyms]", false);
 
1665		map__fixup_start(map);
1666		map__fixup_end(map);
1667	}
1668
1669	return err;
1670}
1671
1672static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map,
1673				      symbol_filter_t filter)
1674{
1675	int err;
1676	const char *kallsyms_filename = NULL;
1677	struct machine *machine;
1678	char path[PATH_MAX];
1679
1680	if (!map->groups) {
1681		pr_debug("Guest kernel map hasn't the point to groups\n");
1682		return -1;
1683	}
1684	machine = map->groups->machine;
1685
1686	if (machine__is_default_guest(machine)) {
1687		/*
1688		 * if the user specified a vmlinux filename, use it and only
1689		 * it, reporting errors to the user if it cannot be used.
1690		 * Or use file guest_kallsyms inputted by user on commandline
1691		 */
1692		if (symbol_conf.default_guest_vmlinux_name != NULL) {
1693			err = dso__load_vmlinux(dso, map,
1694						symbol_conf.default_guest_vmlinux_name,
1695						false, filter);
1696			return err;
1697		}
1698
1699		kallsyms_filename = symbol_conf.default_guest_kallsyms;
1700		if (!kallsyms_filename)
1701			return -1;
1702	} else {
1703		sprintf(path, "%s/proc/kallsyms", machine->root_dir);
1704		kallsyms_filename = path;
1705	}
1706
1707	err = dso__load_kallsyms(dso, kallsyms_filename, map, filter);
1708	if (err > 0)
1709		pr_debug("Using %s for symbols\n", kallsyms_filename);
1710	if (err > 0 && !dso__is_kcore(dso)) {
1711		machine__mmap_name(machine, path, sizeof(path));
1712		dso__set_long_name(dso, strdup(path), true);
1713		map__fixup_start(map);
1714		map__fixup_end(map);
1715	}
1716
1717	return err;
1718}
1719
1720static void vmlinux_path__exit(void)
1721{
1722	while (--vmlinux_path__nr_entries >= 0)
1723		zfree(&vmlinux_path[vmlinux_path__nr_entries]);
 
1724
1725	zfree(&vmlinux_path);
1726}
1727
1728static int vmlinux_path__init(void)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1729{
1730	struct utsname uts;
1731	char bf[PATH_MAX];
 
 
1732
1733	vmlinux_path = malloc(sizeof(char *) * 5);
 
1734	if (vmlinux_path == NULL)
1735		return -1;
1736
1737	vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux");
1738	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1739		goto out_fail;
1740	++vmlinux_path__nr_entries;
1741	vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux");
1742	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1743		goto out_fail;
1744	++vmlinux_path__nr_entries;
1745
1746	/* only try running kernel version if no symfs was given */
1747	if (symbol_conf.symfs[0] != 0)
1748		return 0;
1749
1750	if (uname(&uts) < 0)
1751		return -1;
 
 
 
1752
1753	snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
1754	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1755	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1756		goto out_fail;
1757	++vmlinux_path__nr_entries;
1758	snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release);
1759	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1760	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1761		goto out_fail;
1762	++vmlinux_path__nr_entries;
1763	snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux",
1764		 uts.release);
1765	vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
1766	if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
1767		goto out_fail;
1768	++vmlinux_path__nr_entries;
1769
1770	return 0;
1771
1772out_fail:
1773	vmlinux_path__exit();
1774	return -1;
1775}
1776
1777int setup_list(struct strlist **list, const char *list_str,
1778		      const char *list_name)
1779{
1780	if (list_str == NULL)
1781		return 0;
1782
1783	*list = strlist__new(true, list_str);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1784	if (!*list) {
1785		pr_err("problems parsing %s list\n", list_name);
1786		return -1;
1787	}
1788	return 0;
1789}
1790
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1791static bool symbol__read_kptr_restrict(void)
1792{
1793	bool value = false;
 
 
 
1794
1795	if (geteuid() != 0) {
1796		FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");
1797		if (fp != NULL) {
1798			char line[8];
1799
1800			if (fgets(line, sizeof(line), fp) != NULL)
1801				value = atoi(line) != 0;
1802
1803			fclose(fp);
1804		}
1805	}
1806
 
 
 
 
 
 
1807	return value;
1808}
1809
1810int symbol__init(void)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1811{
1812	const char *symfs;
1813
1814	if (symbol_conf.initialized)
1815		return 0;
1816
1817	symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64));
1818
1819	symbol__elf_init();
1820
1821	if (symbol_conf.sort_by_name)
1822		symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) -
1823					  sizeof(struct symbol));
1824
1825	if (symbol_conf.try_vmlinux_path && vmlinux_path__init() < 0)
1826		return -1;
1827
1828	if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') {
1829		pr_err("'.' is the only non valid --field-separator argument\n");
1830		return -1;
1831	}
1832
1833	if (setup_list(&symbol_conf.dso_list,
1834		       symbol_conf.dso_list_str, "dso") < 0)
1835		return -1;
1836
1837	if (setup_list(&symbol_conf.comm_list,
1838		       symbol_conf.comm_list_str, "comm") < 0)
1839		goto out_free_dso_list;
1840
 
 
 
 
 
 
 
 
1841	if (setup_list(&symbol_conf.sym_list,
1842		       symbol_conf.sym_list_str, "symbol") < 0)
1843		goto out_free_comm_list;
 
 
 
 
 
 
 
 
1844
1845	/*
1846	 * A path to symbols of "/" is identical to ""
1847	 * reset here for simplicity.
1848	 */
1849	symfs = realpath(symbol_conf.symfs, NULL);
1850	if (symfs == NULL)
1851		symfs = symbol_conf.symfs;
1852	if (strcmp(symfs, "/") == 0)
1853		symbol_conf.symfs = "";
1854	if (symfs != symbol_conf.symfs)
1855		free((void *)symfs);
1856
1857	symbol_conf.kptr_restrict = symbol__read_kptr_restrict();
1858
1859	symbol_conf.initialized = true;
1860	return 0;
1861
 
 
 
 
 
 
 
1862out_free_comm_list:
1863	strlist__delete(symbol_conf.comm_list);
1864out_free_dso_list:
1865	strlist__delete(symbol_conf.dso_list);
1866	return -1;
1867}
1868
1869void symbol__exit(void)
1870{
1871	if (!symbol_conf.initialized)
1872		return;
 
1873	strlist__delete(symbol_conf.sym_list);
1874	strlist__delete(symbol_conf.dso_list);
1875	strlist__delete(symbol_conf.comm_list);
 
 
 
1876	vmlinux_path__exit();
1877	symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL;
 
1878	symbol_conf.initialized = false;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1879}