| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Arnaldo Carvalho de Melo | 2635 | 22.82% | 146 | 42.94% |
| Ian Rogers | 2416 | 20.93% | 30 | 8.82% |
| Adrian Hunter | 2375 | 20.57% | 27 | 7.94% |
| Jiri Olsa | 973 | 8.43% | 20 | 5.88% |
| Namhyung Kim | 457 | 3.96% | 21 | 6.18% |
| Anton Blanchard | 375 | 3.25% | 6 | 1.76% |
| Remi Bernon | 373 | 3.23% | 2 | 0.59% |
| Jin Yao | 223 | 1.93% | 1 | 0.29% |
| David Ahern | 196 | 1.70% | 6 | 1.76% |
| Masami Hiramatsu | 167 | 1.45% | 9 | 2.65% |
| Paul A. Clarke | 143 | 1.24% | 1 | 0.29% |
| Ekaterina Tumanova | 127 | 1.10% | 2 | 0.59% |
| Yanmin Zhang | 125 | 1.08% | 1 | 0.29% |
| James Clark | 100 | 0.87% | 2 | 0.59% |
| Krister Johansen | 78 | 0.68% | 5 | 1.47% |
| Chris Phlipot | 70 | 0.61% | 2 | 0.59% |
| Naveen N. Rao | 61 | 0.53% | 2 | 0.59% |
| He Kuang | 58 | 0.50% | 1 | 0.29% |
| Athira Rajeev | 58 | 0.50% | 2 | 0.59% |
| Davidlohr Bueso A | 58 | 0.50% | 1 | 0.29% |
| Thomas Richter | 44 | 0.38% | 2 | 0.59% |
| Pekka J Enberg | 43 | 0.37% | 1 | 0.29% |
| Kim Phillips | 42 | 0.36% | 2 | 0.59% |
| Wang Nan | 41 | 0.36% | 3 | 0.88% |
| Lei Ming | 36 | 0.31% | 1 | 0.29% |
| Igor Lubashev | 35 | 0.30% | 1 | 0.29% |
| Tommi Rantala | 32 | 0.28% | 1 | 0.29% |
| Frédéric Weisbecker | 31 | 0.27% | 4 | 1.18% |
| Andi Kleen | 21 | 0.18% | 3 | 0.88% |
| Ingo Molnar | 17 | 0.15% | 4 | 1.18% |
| Lexi Shao | 13 | 0.11% | 1 | 0.29% |
| Arjan van de Ven | 10 | 0.09% | 1 | 0.29% |
| Chenggang Qin | 10 | 0.09% | 1 | 0.29% |
| Willy Tarreau | 10 | 0.09% | 1 | 0.29% |
| Cody P Schafer | 10 | 0.09% | 3 | 0.88% |
| Mike Galbraith | 7 | 0.06% | 2 | 0.59% |
| Peter Zijlstra | 7 | 0.06% | 1 | 0.29% |
| John Kacur | 7 | 0.06% | 2 | 0.59% |
| Andy Shevchenko | 6 | 0.05% | 1 | 0.29% |
| Dima Kogan | 6 | 0.05% | 1 | 0.29% |
| Avi Kivity | 5 | 0.04% | 1 | 0.29% |
| Milian Wolff | 5 | 0.04% | 1 | 0.29% |
| Paul Mackerras | 5 | 0.04% | 1 | 0.29% |
| Victor Kamensky | 5 | 0.04% | 1 | 0.29% |
| Sven Schnelle | 4 | 0.03% | 1 | 0.29% |
| Song Liu | 3 | 0.03% | 1 | 0.29% |
| Li Zhang | 3 | 0.03% | 1 | 0.29% |
| Alexander Yarygin | 3 | 0.03% | 1 | 0.29% |
| Hari Bathini | 3 | 0.03% | 1 | 0.29% |
| Eric Saint Etienne | 2 | 0.02% | 1 | 0.29% |
| Srikar Dronamraju | 2 | 0.02% | 1 | 0.29% |
| Daniel Borkmann | 2 | 0.02% | 1 | 0.29% |
| Ricardo Ribalda Delgado | 2 | 0.02% | 1 | 0.29% |
| Kan Liang | 2 | 0.02% | 1 | 0.29% |
| Greg Kroah-Hartman | 1 | 0.01% | 1 | 0.29% |
| Nicholas Fraser | 1 | 0.01% | 1 | 0.29% |
| Irina Tirdea | 1 | 0.01% | 1 | 0.29% |
| Total | 11545 | 340 |
// SPDX-License-Identifier: GPL-2.0 #include <dirent.h> #include <errno.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <linux/capability.h> #include <linux/kernel.h> #include <linux/mman.h> #include <linux/string.h> #include <linux/time64.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/param.h> #include <fcntl.h> #include <unistd.h> #include <inttypes.h> #include "annotate.h" #include "build-id.h" #include "cap.h" #include "dso.h" #include "util.h" // lsdir() #include "debug.h" #include "event.h" #include "machine.h" #include "map.h" #include "symbol.h" #include "map_symbol.h" #include "mem-events.h" #include "symsrc.h" #include "strlist.h" #include "intlist.h" #include "namespaces.h" #include "header.h" #include "path.h" #include <linux/ctype.h> #include <linux/zalloc.h> #include <elf.h> #include <limits.h> #include <symbol/kallsyms.h> #include <sys/utsname.h> static int dso__load_kernel_sym(struct dso *dso, struct map *map); static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map); static bool symbol__is_idle(const char *name); int vmlinux_path__nr_entries; char **vmlinux_path; struct symbol_conf symbol_conf = { .nanosecs = false, .use_modules = true, .try_vmlinux_path = true, .demangle = true, .demangle_kernel = false, .cumulate_callchain = true, .time_quantum = 100 * NSEC_PER_MSEC, /* 100ms */ .show_hist_headers = true, .symfs = "", .event_group = true, .inline_name = true, .res_sample = 0, }; struct map_list_node { struct list_head node; struct map *map; }; static struct map_list_node *map_list_node__new(void) { return malloc(sizeof(struct map_list_node)); } static enum dso_binary_type binary_type_symtab[] = { DSO_BINARY_TYPE__KALLSYMS, DSO_BINARY_TYPE__GUEST_KALLSYMS, DSO_BINARY_TYPE__JAVA_JIT, DSO_BINARY_TYPE__DEBUGLINK, DSO_BINARY_TYPE__BUILD_ID_CACHE, DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO, DSO_BINARY_TYPE__FEDORA_DEBUGINFO, DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, DSO_BINARY_TYPE__BUILDID_DEBUGINFO, DSO_BINARY_TYPE__SYSTEM_PATH_DSO, DSO_BINARY_TYPE__GUEST_KMODULE, DSO_BINARY_TYPE__GUEST_KMODULE_COMP, DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE, DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP, DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO, DSO_BINARY_TYPE__NOT_FOUND, }; #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab) static bool symbol_type__filter(char symbol_type) { symbol_type = toupper(symbol_type); return symbol_type == 'T' || symbol_type == 'W' || symbol_type == 'D' || symbol_type == 'B'; } static int prefix_underscores_count(const char *str) { const char *tail = str; while (*tail == '_') tail++; return tail - str; } const char * __weak arch__normalize_symbol_name(const char *name) { return name; } int __weak arch__compare_symbol_names(const char *namea, const char *nameb) { return strcmp(namea, nameb); } int __weak arch__compare_symbol_names_n(const char *namea, const char *nameb, unsigned int n) { return strncmp(namea, nameb, n); } int __weak arch__choose_best_symbol(struct symbol *syma, struct symbol *symb __maybe_unused) { /* Avoid "SyS" kernel syscall aliases */ if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3)) return SYMBOL_B; if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10)) return SYMBOL_B; return SYMBOL_A; } static int choose_best_symbol(struct symbol *syma, struct symbol *symb) { s64 a; s64 b; size_t na, nb; /* Prefer a symbol with non zero length */ a = syma->end - syma->start; b = symb->end - symb->start; if ((b == 0) && (a > 0)) return SYMBOL_A; else if ((a == 0) && (b > 0)) return SYMBOL_B; /* Prefer a non weak symbol over a weak one */ a = syma->binding == STB_WEAK; b = symb->binding == STB_WEAK; if (b && !a) return SYMBOL_A; if (a && !b) return SYMBOL_B; /* Prefer a global symbol over a non global one */ a = syma->binding == STB_GLOBAL; b = symb->binding == STB_GLOBAL; if (a && !b) return SYMBOL_A; if (b && !a) return SYMBOL_B; /* Prefer a symbol with less underscores */ a = prefix_underscores_count(syma->name); b = prefix_underscores_count(symb->name); if (b > a) return SYMBOL_A; else if (a > b) return SYMBOL_B; /* Choose the symbol with the longest name */ na = strlen(syma->name); nb = strlen(symb->name); if (na > nb) return SYMBOL_A; else if (na < nb) return SYMBOL_B; return arch__choose_best_symbol(syma, symb); } void symbols__fixup_duplicate(struct rb_root_cached *symbols) { struct rb_node *nd; struct symbol *curr, *next; if (symbol_conf.allow_aliases) return; nd = rb_first_cached(symbols); while (nd) { curr = rb_entry(nd, struct symbol, rb_node); again: nd = rb_next(&curr->rb_node); if (!nd) break; next = rb_entry(nd, struct symbol, rb_node); if (curr->start != next->start) continue; if (choose_best_symbol(curr, next) == SYMBOL_A) { if (next->type == STT_GNU_IFUNC) curr->ifunc_alias = true; rb_erase_cached(&next->rb_node, symbols); symbol__delete(next); goto again; } else { if (curr->type == STT_GNU_IFUNC) next->ifunc_alias = true; nd = rb_next(&curr->rb_node); rb_erase_cached(&curr->rb_node, symbols); symbol__delete(curr); } } } /* Update zero-sized symbols using the address of the next symbol */ void symbols__fixup_end(struct rb_root_cached *symbols, bool is_kallsyms) { struct rb_node *nd, *prevnd = rb_first_cached(symbols); struct symbol *curr, *prev; if (prevnd == NULL) return; curr = rb_entry(prevnd, struct symbol, rb_node); for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { prev = curr; curr = rb_entry(nd, struct symbol, rb_node); /* * On some architecture kernel text segment start is located at * some low memory address, while modules are located at high * memory addresses (or vice versa). The gap between end of * kernel text segment and beginning of first module's text * segment is very big. Therefore do not fill this gap and do * not assign it to the kernel dso map (kallsyms). * * Also BPF code can be allocated separately from text segments * and modules. So the last entry in a module should not fill * the gap too. * * In kallsyms, it determines module symbols using '[' character * like in: * ffffffffc1937000 T hdmi_driver_init [snd_hda_codec_hdmi] */ if (prev->end == prev->start) { const char *prev_mod; const char *curr_mod; if (!is_kallsyms) { prev->end = curr->start; continue; } prev_mod = strchr(prev->name, '['); curr_mod = strchr(curr->name, '['); /* Last kernel/module symbol mapped to end of page */ if (!prev_mod != !curr_mod) prev->end = roundup(prev->end + 4096, 4096); /* Last symbol in the previous module */ else if (prev_mod && strcmp(prev_mod, curr_mod)) prev->end = roundup(prev->end + 4096, 4096); else prev->end = curr->start; pr_debug4("%s sym:%s end:%#" PRIx64 "\n", __func__, prev->name, prev->end); } } /* Last entry */ if (curr->end == curr->start) curr->end = roundup(curr->start, 4096) + 4096; } struct symbol *symbol__new(u64 start, u64 len, u8 binding, u8 type, const char *name) { size_t namelen = strlen(name) + 1; struct symbol *sym = calloc(1, (symbol_conf.priv_size + sizeof(*sym) + namelen)); if (sym == NULL) return NULL; if (symbol_conf.priv_size) { if (symbol_conf.init_annotation) { struct annotation *notes = (void *)sym; annotation__init(notes); } sym = ((void *)sym) + symbol_conf.priv_size; } sym->start = start; sym->end = len ? start + len : start; sym->type = type; sym->binding = binding; sym->namelen = namelen - 1; pr_debug4("%s: %s %#" PRIx64 "-%#" PRIx64 "\n", __func__, name, start, sym->end); memcpy(sym->name, name, namelen); return sym; } void symbol__delete(struct symbol *sym) { if (symbol_conf.priv_size) { if (symbol_conf.init_annotation) { struct annotation *notes = symbol__annotation(sym); annotation__exit(notes); } } free(((void *)sym) - symbol_conf.priv_size); } void symbols__delete(struct rb_root_cached *symbols) { struct symbol *pos; struct rb_node *next = rb_first_cached(symbols); while (next) { pos = rb_entry(next, struct symbol, rb_node); next = rb_next(&pos->rb_node); rb_erase_cached(&pos->rb_node, symbols); symbol__delete(pos); } } void __symbols__insert(struct rb_root_cached *symbols, struct symbol *sym, bool kernel) { struct rb_node **p = &symbols->rb_root.rb_node; struct rb_node *parent = NULL; const u64 ip = sym->start; struct symbol *s; bool leftmost = true; if (kernel) { const char *name = sym->name; /* * ppc64 uses function descriptors and appends a '.' to the * start of every instruction address. Remove it. */ if (name[0] == '.') name++; sym->idle = symbol__is_idle(name); } while (*p != NULL) { parent = *p; s = rb_entry(parent, struct symbol, rb_node); if (ip < s->start) p = &(*p)->rb_left; else { p = &(*p)->rb_right; leftmost = false; } } rb_link_node(&sym->rb_node, parent, p); rb_insert_color_cached(&sym->rb_node, symbols, leftmost); } void symbols__insert(struct rb_root_cached *symbols, struct symbol *sym) { __symbols__insert(symbols, sym, false); } static struct symbol *symbols__find(struct rb_root_cached *symbols, u64 ip) { struct rb_node *n; if (symbols == NULL) return NULL; n = symbols->rb_root.rb_node; while (n) { struct symbol *s = rb_entry(n, struct symbol, rb_node); if (ip < s->start) n = n->rb_left; else if (ip > s->end || (ip == s->end && ip != s->start)) n = n->rb_right; else return s; } return NULL; } static struct symbol *symbols__first(struct rb_root_cached *symbols) { struct rb_node *n = rb_first_cached(symbols); if (n) return rb_entry(n, struct symbol, rb_node); return NULL; } static struct symbol *symbols__last(struct rb_root_cached *symbols) { struct rb_node *n = rb_last(&symbols->rb_root); if (n) return rb_entry(n, struct symbol, rb_node); return NULL; } static struct symbol *symbols__next(struct symbol *sym) { struct rb_node *n = rb_next(&sym->rb_node); if (n) return rb_entry(n, struct symbol, rb_node); return NULL; } static int symbols__sort_name_cmp(const void *vlhs, const void *vrhs) { const struct symbol *lhs = *((const struct symbol **)vlhs); const struct symbol *rhs = *((const struct symbol **)vrhs); return strcmp(lhs->name, rhs->name); } static struct symbol **symbols__sort_by_name(struct rb_root_cached *source, size_t *len) { struct rb_node *nd; struct symbol **result; size_t i = 0, size = 0; for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) size++; result = malloc(sizeof(*result) * size); if (!result) return NULL; for (nd = rb_first_cached(source); nd; nd = rb_next(nd)) { struct symbol *pos = rb_entry(nd, struct symbol, rb_node); result[i++] = pos; } qsort(result, size, sizeof(*result), symbols__sort_name_cmp); *len = size; return result; } int symbol__match_symbol_name(const char *name, const char *str, enum symbol_tag_include includes) { const char *versioning; if (includes == SYMBOL_TAG_INCLUDE__DEFAULT_ONLY && (versioning = strstr(name, "@@"))) { int len = strlen(str); if (len < versioning - name) len = versioning - name; return arch__compare_symbol_names_n(name, str, len); } else return arch__compare_symbol_names(name, str); } static struct symbol *symbols__find_by_name(struct symbol *symbols[], size_t symbols_len, const char *name, enum symbol_tag_include includes, size_t *found_idx) { size_t i, lower = 0, upper = symbols_len; struct symbol *s = NULL; if (found_idx) *found_idx = SIZE_MAX; if (!symbols_len) return NULL; while (lower < upper) { int cmp; i = (lower + upper) / 2; cmp = symbol__match_symbol_name(symbols[i]->name, name, includes); if (cmp > 0) upper = i; else if (cmp < 0) lower = i + 1; else { if (found_idx) *found_idx = i; s = symbols[i]; break; } } if (s && includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY) { /* return first symbol that has same name (if any) */ for (; i > 0; i--) { struct symbol *tmp = symbols[i - 1]; if (!arch__compare_symbol_names(tmp->name, s->name)) { if (found_idx) *found_idx = i - 1; s = tmp; } else break; } } assert(!found_idx || !s || s == symbols[*found_idx]); return s; } void dso__reset_find_symbol_cache(struct dso *dso) { dso->last_find_result.addr = 0; dso->last_find_result.symbol = NULL; } void dso__insert_symbol(struct dso *dso, struct symbol *sym) { __symbols__insert(&dso->symbols, sym, dso->kernel); /* update the symbol cache if necessary */ if (dso->last_find_result.addr >= sym->start && (dso->last_find_result.addr < sym->end || sym->start == sym->end)) { dso->last_find_result.symbol = sym; } } void dso__delete_symbol(struct dso *dso, struct symbol *sym) { rb_erase_cached(&sym->rb_node, &dso->symbols); symbol__delete(sym); dso__reset_find_symbol_cache(dso); } struct symbol *dso__find_symbol(struct dso *dso, u64 addr) { if (dso->last_find_result.addr != addr || dso->last_find_result.symbol == NULL) { dso->last_find_result.addr = addr; dso->last_find_result.symbol = symbols__find(&dso->symbols, addr); } return dso->last_find_result.symbol; } struct symbol *dso__find_symbol_nocache(struct dso *dso, u64 addr) { return symbols__find(&dso->symbols, addr); } struct symbol *dso__first_symbol(struct dso *dso) { return symbols__first(&dso->symbols); } struct symbol *dso__last_symbol(struct dso *dso) { return symbols__last(&dso->symbols); } struct symbol *dso__next_symbol(struct symbol *sym) { return symbols__next(sym); } struct symbol *dso__next_symbol_by_name(struct dso *dso, size_t *idx) { if (*idx + 1 >= dso->symbol_names_len) return NULL; ++*idx; return dso->symbol_names[*idx]; } /* * Returns first symbol that matched with @name. */ struct symbol *dso__find_symbol_by_name(struct dso *dso, const char *name, size_t *idx) { struct symbol *s = symbols__find_by_name(dso->symbol_names, dso->symbol_names_len, name, SYMBOL_TAG_INCLUDE__NONE, idx); if (!s) s = symbols__find_by_name(dso->symbol_names, dso->symbol_names_len, name, SYMBOL_TAG_INCLUDE__DEFAULT_ONLY, idx); return s; } void dso__sort_by_name(struct dso *dso) { mutex_lock(&dso->lock); if (!dso__sorted_by_name(dso)) { size_t len; dso->symbol_names = symbols__sort_by_name(&dso->symbols, &len); if (dso->symbol_names) { dso->symbol_names_len = len; dso__set_sorted_by_name(dso); } } mutex_unlock(&dso->lock); } /* * While we find nice hex chars, build a long_val. * Return number of chars processed. */ static int hex2u64(const char *ptr, u64 *long_val) { char *p; *long_val = strtoull(ptr, &p, 16); return p - ptr; } int modules__parse(const char *filename, void *arg, int (*process_module)(void *arg, const char *name, u64 start, u64 size)) { char *line = NULL; size_t n; FILE *file; int err = 0; file = fopen(filename, "r"); if (file == NULL) return -1; while (1) { char name[PATH_MAX]; u64 start, size; char *sep, *endptr; ssize_t line_len; line_len = getline(&line, &n, file); if (line_len < 0) { if (feof(file)) break; err = -1; goto out; } if (!line) { err = -1; goto out; } line[--line_len] = '\0'; /* \n */ sep = strrchr(line, 'x'); if (sep == NULL) continue; hex2u64(sep + 1, &start); sep = strchr(line, ' '); if (sep == NULL) continue; *sep = '\0'; scnprintf(name, sizeof(name), "[%s]", line); size = strtoul(sep + 1, &endptr, 0); if (*endptr != ' ' && *endptr != '\t') continue; err = process_module(arg, name, start, size); if (err) break; } out: free(line); fclose(file); return err; } /* * These are symbols in the kernel image, so make sure that * sym is from a kernel DSO. */ static bool symbol__is_idle(const char *name) { const char * const idle_symbols[] = { "acpi_idle_do_entry", "acpi_processor_ffh_cstate_enter", "arch_cpu_idle", "cpu_idle", "cpu_startup_entry", "idle_cpu", "intel_idle", "intel_idle_ibrs", "default_idle", "native_safe_halt", "enter_idle", "exit_idle", "mwait_idle", "mwait_idle_with_hints", "mwait_idle_with_hints.constprop.0", "poll_idle", "ppc64_runlatch_off", "pseries_dedicated_idle_sleep", "psw_idle", "psw_idle_exit", NULL }; int i; static struct strlist *idle_symbols_list; if (idle_symbols_list) return strlist__has_entry(idle_symbols_list, name); idle_symbols_list = strlist__new(NULL, NULL); for (i = 0; idle_symbols[i]; i++) strlist__add(idle_symbols_list, idle_symbols[i]); return strlist__has_entry(idle_symbols_list, name); } static int map__process_kallsym_symbol(void *arg, const char *name, char type, u64 start) { struct symbol *sym; struct dso *dso = arg; struct rb_root_cached *root = &dso->symbols; if (!symbol_type__filter(type)) return 0; /* Ignore local symbols for ARM modules */ if (name[0] == '$') return 0; /* * module symbols are not sorted so we add all * symbols, setting length to 0, and rely on * symbols__fixup_end() to fix it up. */ sym = symbol__new(start, 0, kallsyms2elf_binding(type), kallsyms2elf_type(type), name); if (sym == NULL) return -ENOMEM; /* * We will pass the symbols to the filter later, in * map__split_kallsyms, when we have split the maps per module */ __symbols__insert(root, sym, !strchr(name, '[')); return 0; } /* * Loads the function entries in /proc/kallsyms into kernel_map->dso, * so that we can in the next step set the symbol ->end address and then * call kernel_maps__split_kallsyms. */ static int dso__load_all_kallsyms(struct dso *dso, const char *filename) { return kallsyms__parse(filename, dso, map__process_kallsym_symbol); } static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso) { struct symbol *pos; int count = 0; struct rb_root_cached old_root = dso->symbols; struct rb_root_cached *root = &dso->symbols; struct rb_node *next = rb_first_cached(root); if (!kmaps) return -1; *root = RB_ROOT_CACHED; while (next) { struct map *curr_map; struct dso *curr_map_dso; char *module; pos = rb_entry(next, struct symbol, rb_node); next = rb_next(&pos->rb_node); rb_erase_cached(&pos->rb_node, &old_root); RB_CLEAR_NODE(&pos->rb_node); module = strchr(pos->name, '\t'); if (module) *module = '\0'; curr_map = maps__find(kmaps, pos->start); if (!curr_map) { symbol__delete(pos); continue; } curr_map_dso = map__dso(curr_map); pos->start -= map__start(curr_map) - map__pgoff(curr_map); if (pos->end > map__end(curr_map)) pos->end = map__end(curr_map); if (pos->end) pos->end -= map__start(curr_map) - map__pgoff(curr_map); symbols__insert(&curr_map_dso->symbols, pos); ++count; map__put(curr_map); } /* Symbols have been adjusted */ dso->adjust_symbols = 1; return count; } /* * Split the symbols into maps, making sure there are no overlaps, i.e. the * kernel range is broken in several maps, named [kernel].N, as we don't have * the original ELF section names vmlinux have. */ static int maps__split_kallsyms(struct maps *kmaps, struct dso *dso, u64 delta, struct map *initial_map) { struct machine *machine; struct map *curr_map = map__get(initial_map); struct symbol *pos; int count = 0, moved = 0; struct rb_root_cached *root = &dso->symbols; struct rb_node *next = rb_first_cached(root); int kernel_range = 0; bool x86_64; if (!kmaps) return -1; machine = maps__machine(kmaps); x86_64 = machine__is(machine, "x86_64"); while (next) { char *module; pos = rb_entry(next, struct symbol, rb_node); next = rb_next(&pos->rb_node); module = strchr(pos->name, '\t'); if (module) { struct dso *curr_map_dso; if (!symbol_conf.use_modules) goto discard_symbol; *module++ = '\0'; curr_map_dso = map__dso(curr_map); if (strcmp(curr_map_dso->short_name, module)) { if (!RC_CHK_EQUAL(curr_map, initial_map) && dso->kernel == DSO_SPACE__KERNEL_GUEST && machine__is_default_guest(machine)) { /* * We assume all symbols of a module are * continuous in * kallsyms, so curr_map * points to a module and all its * symbols are in its kmap. Mark it as * loaded. */ dso__set_loaded(curr_map_dso); } map__zput(curr_map); curr_map = maps__find_by_name(kmaps, module); if (curr_map == NULL) { pr_debug("%s/proc/{kallsyms,modules} " "inconsistency while looking " "for \"%s\" module!\n", machine->root_dir, module); curr_map = map__get(initial_map); goto discard_symbol; } curr_map_dso = map__dso(curr_map); if (curr_map_dso->loaded && !machine__is_default_guest(machine)) goto discard_symbol; } /* * So that we look just like we get from .ko files, * i.e. not prelinked, relative to initial_map->start. */ pos->start = map__map_ip(curr_map, pos->start); pos->end = map__map_ip(curr_map, pos->end); } else if (x86_64 && is_entry_trampoline(pos->name)) { /* * These symbols are not needed anymore since the * trampoline maps refer to the text section and it's * symbols instead. Avoid having to deal with * relocations, and the assumption that the first symbol * is the start of kernel text, by simply removing the * symbols at this point. */ goto discard_symbol; } else if (!RC_CHK_EQUAL(curr_map, initial_map)) { char dso_name[PATH_MAX]; struct dso *ndso; if (delta) { /* Kernel was relocated at boot time */ pos->start -= delta; pos->end -= delta; } if (count == 0) { map__zput(curr_map); curr_map = map__get(initial_map); goto add_symbol; } if (dso->kernel == DSO_SPACE__KERNEL_GUEST) snprintf(dso_name, sizeof(dso_name), "[guest.kernel].%d", kernel_range++); else snprintf(dso_name, sizeof(dso_name), "[kernel].%d", kernel_range++); ndso = dso__new(dso_name); map__zput(curr_map); if (ndso == NULL) return -1; ndso->kernel = dso->kernel; curr_map = map__new2(pos->start, ndso); if (curr_map == NULL) { dso__put(ndso); return -1; } map__set_mapping_type(curr_map, MAPPING_TYPE__IDENTITY); if (maps__insert(kmaps, curr_map)) { map__zput(curr_map); dso__put(ndso); return -1; } ++kernel_range; } else if (delta) { /* Kernel was relocated at boot time */ pos->start -= delta; pos->end -= delta; } add_symbol: if (!RC_CHK_EQUAL(curr_map, initial_map)) { struct dso *curr_map_dso = map__dso(curr_map); rb_erase_cached(&pos->rb_node, root); symbols__insert(&curr_map_dso->symbols, pos); ++moved; } else ++count; continue; discard_symbol: rb_erase_cached(&pos->rb_node, root); symbol__delete(pos); } if (!RC_CHK_EQUAL(curr_map, initial_map) && dso->kernel == DSO_SPACE__KERNEL_GUEST && machine__is_default_guest(maps__machine(kmaps))) { dso__set_loaded(map__dso(curr_map)); } map__put(curr_map); return count + moved; } bool symbol__restricted_filename(const char *filename, const char *restricted_filename) { bool restricted = false; if (symbol_conf.kptr_restrict) { char *r = realpath(filename, NULL); if (r != NULL) { restricted = strcmp(r, restricted_filename) == 0; free(r); return restricted; } } return restricted; } struct module_info { struct rb_node rb_node; char *name; u64 start; }; static void add_module(struct module_info *mi, struct rb_root *modules) { struct rb_node **p = &modules->rb_node; struct rb_node *parent = NULL; struct module_info *m; while (*p != NULL) { parent = *p; m = rb_entry(parent, struct module_info, rb_node); if (strcmp(mi->name, m->name) < 0) p = &(*p)->rb_left; else p = &(*p)->rb_right; } rb_link_node(&mi->rb_node, parent, p); rb_insert_color(&mi->rb_node, modules); } static void delete_modules(struct rb_root *modules) { struct module_info *mi; struct rb_node *next = rb_first(modules); while (next) { mi = rb_entry(next, struct module_info, rb_node); next = rb_next(&mi->rb_node); rb_erase(&mi->rb_node, modules); zfree(&mi->name); free(mi); } } static struct module_info *find_module(const char *name, struct rb_root *modules) { struct rb_node *n = modules->rb_node; while (n) { struct module_info *m; int cmp; m = rb_entry(n, struct module_info, rb_node); cmp = strcmp(name, m->name); if (cmp < 0) n = n->rb_left; else if (cmp > 0) n = n->rb_right; else return m; } return NULL; } static int __read_proc_modules(void *arg, const char *name, u64 start, u64 size __maybe_unused) { struct rb_root *modules = arg; struct module_info *mi; mi = zalloc(sizeof(struct module_info)); if (!mi) return -ENOMEM; mi->name = strdup(name); mi->start = start; if (!mi->name) { free(mi); return -ENOMEM; } add_module(mi, modules); return 0; } static int read_proc_modules(const char *filename, struct rb_root *modules) { if (symbol__restricted_filename(filename, "/proc/modules")) return -1; if (modules__parse(filename, modules, __read_proc_modules)) { delete_modules(modules); return -1; } return 0; } int compare_proc_modules(const char *from, const char *to) { struct rb_root from_modules = RB_ROOT; struct rb_root to_modules = RB_ROOT; struct rb_node *from_node, *to_node; struct module_info *from_m, *to_m; int ret = -1; if (read_proc_modules(from, &from_modules)) return -1; if (read_proc_modules(to, &to_modules)) goto out_delete_from; from_node = rb_first(&from_modules); to_node = rb_first(&to_modules); while (from_node) { if (!to_node) break; from_m = rb_entry(from_node, struct module_info, rb_node); to_m = rb_entry(to_node, struct module_info, rb_node); if (from_m->start != to_m->start || strcmp(from_m->name, to_m->name)) break; from_node = rb_next(from_node); to_node = rb_next(to_node); } if (!from_node && !to_node) ret = 0; delete_modules(&to_modules); out_delete_from: delete_modules(&from_modules); return ret; } static int do_validate_kcore_modules_cb(struct map *old_map, void *data) { struct rb_root *modules = data; struct module_info *mi; struct dso *dso; if (!__map__is_kmodule(old_map)) return 0; dso = map__dso(old_map); /* Module must be in memory at the same address */ mi = find_module(dso->short_name, modules); if (!mi || mi->start != map__start(old_map)) return -EINVAL; return 0; } static int do_validate_kcore_modules(const char *filename, struct maps *kmaps) { struct rb_root modules = RB_ROOT; int err; err = read_proc_modules(filename, &modules); if (err) return err; err = maps__for_each_map(kmaps, do_validate_kcore_modules_cb, &modules); delete_modules(&modules); return err; } /* * If kallsyms is referenced by name then we look for filename in the same * directory. */ static bool filename_from_kallsyms_filename(char *filename, const char *base_name, const char *kallsyms_filename) { char *name; strcpy(filename, kallsyms_filename); name = strrchr(filename, '/'); if (!name) return false; name += 1; if (!strcmp(name, "kallsyms")) { strcpy(name, base_name); return true; } return false; } static int validate_kcore_modules(const char *kallsyms_filename, struct map *map) { struct maps *kmaps = map__kmaps(map); char modules_filename[PATH_MAX]; if (!kmaps) return -EINVAL; if (!filename_from_kallsyms_filename(modules_filename, "modules", kallsyms_filename)) return -EINVAL; if (do_validate_kcore_modules(modules_filename, kmaps)) return -EINVAL; return 0; } static int validate_kcore_addresses(const char *kallsyms_filename, struct map *map) { struct kmap *kmap = map__kmap(map); if (!kmap) return -EINVAL; if (kmap->ref_reloc_sym && kmap->ref_reloc_sym->name) { u64 start; if (kallsyms__get_function_start(kallsyms_filename, kmap->ref_reloc_sym->name, &start)) return -ENOENT; if (start != kmap->ref_reloc_sym->addr) return -EINVAL; } return validate_kcore_modules(kallsyms_filename, map); } struct kcore_mapfn_data { struct dso *dso; struct list_head maps; }; static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data) { struct kcore_mapfn_data *md = data; struct map_list_node *list_node = map_list_node__new(); if (!list_node) return -ENOMEM; list_node->map = map__new2(start, md->dso); if (!list_node->map) { free(list_node); return -ENOMEM; } map__set_end(list_node->map, map__start(list_node->map) + len); map__set_pgoff(list_node->map, pgoff); list_add(&list_node->node, &md->maps); return 0; } static bool remove_old_maps(struct map *map, void *data) { const struct map *map_to_save = data; /* * We need to preserve eBPF maps even if they are covered by kcore, * because we need to access eBPF dso for source data. */ return !RC_CHK_EQUAL(map, map_to_save) && !__map__is_bpf_prog(map); } static int dso__load_kcore(struct dso *dso, struct map *map, const char *kallsyms_filename) { struct maps *kmaps = map__kmaps(map); struct kcore_mapfn_data md; struct map *replacement_map = NULL; struct machine *machine; bool is_64_bit; int err, fd; char kcore_filename[PATH_MAX]; u64 stext; if (!kmaps) return -EINVAL; machine = maps__machine(kmaps); /* This function requires that the map is the kernel map */ if (!__map__is_kernel(map)) return -EINVAL; if (!filename_from_kallsyms_filename(kcore_filename, "kcore", kallsyms_filename)) return -EINVAL; /* Modules and kernel must be present at their original addresses */ if (validate_kcore_addresses(kallsyms_filename, map)) return -EINVAL; md.dso = dso; INIT_LIST_HEAD(&md.maps); fd = open(kcore_filename, O_RDONLY); if (fd < 0) { pr_debug("Failed to open %s. Note /proc/kcore requires CAP_SYS_RAWIO capability to access.\n", kcore_filename); return -EINVAL; } /* Read new maps into temporary lists */ err = file__read_maps(fd, map__prot(map) & PROT_EXEC, kcore_mapfn, &md, &is_64_bit); if (err) goto out_err; dso->is_64_bit = is_64_bit; if (list_empty(&md.maps)) { err = -EINVAL; goto out_err; } /* Remove old maps */ maps__remove_maps(kmaps, remove_old_maps, map); machine->trampolines_mapped = false; /* Find the kernel map using the '_stext' symbol */ if (!kallsyms__get_function_start(kallsyms_filename, "_stext", &stext)) { u64 replacement_size = 0; struct map_list_node *new_node; list_for_each_entry(new_node, &md.maps, node) { struct map *new_map = new_node->map; u64 new_size = map__size(new_map); if (!(stext >= map__start(new_map) && stext < map__end(new_map))) continue; /* * On some architectures, ARM64 for example, the kernel * text can get allocated inside of the vmalloc segment. * Select the smallest matching segment, in case stext * falls within more than one in the list. */ if (!replacement_map || new_size < replacement_size) { replacement_map = new_map; replacement_size = new_size; } } } if (!replacement_map) replacement_map = list_entry(md.maps.next, struct map_list_node, node)->map; /* Add new maps */ while (!list_empty(&md.maps)) { struct map_list_node *new_node = list_entry(md.maps.next, struct map_list_node, node); struct map *new_map = new_node->map; list_del_init(&new_node->node); if (RC_CHK_EQUAL(new_map, replacement_map)) { struct map *map_ref; map__set_start(map, map__start(new_map)); map__set_end(map, map__end(new_map)); map__set_pgoff(map, map__pgoff(new_map)); map__set_mapping_type(map, map__mapping_type(new_map)); /* Ensure maps are correctly ordered */ map_ref = map__get(map); maps__remove(kmaps, map_ref); err = maps__insert(kmaps, map_ref); map__put(map_ref); map__put(new_map); if (err) goto out_err; } else { /* * Merge kcore map into existing maps, * and ensure that current maps (eBPF) * stay intact. */ if (maps__merge_in(kmaps, new_map)) { err = -EINVAL; goto out_err; } } free(new_node); } if (machine__is(machine, "x86_64")) { u64 addr; /* * If one of the corresponding symbols is there, assume the * entry trampoline maps are too. */ if (!kallsyms__get_function_start(kallsyms_filename, ENTRY_TRAMPOLINE_NAME, &addr)) machine->trampolines_mapped = true; } /* * Set the data type and long name so that kcore can be read via * dso__data_read_addr(). */ if (dso->kernel == DSO_SPACE__KERNEL_GUEST) dso->binary_type = DSO_BINARY_TYPE__GUEST_KCORE; else dso->binary_type = DSO_BINARY_TYPE__KCORE; dso__set_long_name(dso, strdup(kcore_filename), true); close(fd); if (map__prot(map) & PROT_EXEC) pr_debug("Using %s for kernel object code\n", kcore_filename); else pr_debug("Using %s for kernel data\n", kcore_filename); return 0; out_err: while (!list_empty(&md.maps)) { struct map_list_node *list_node; list_node = list_entry(md.maps.next, struct map_list_node, node); list_del_init(&list_node->node); map__zput(list_node->map); free(list_node); } close(fd); return err; } /* * If the kernel is relocated at boot time, kallsyms won't match. Compute the * delta based on the relocation reference symbol. */ static int kallsyms__delta(struct kmap *kmap, const char *filename, u64 *delta) { u64 addr; if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name) return 0; if (kallsyms__get_function_start(filename, kmap->ref_reloc_sym->name, &addr)) return -1; *delta = addr - kmap->ref_reloc_sym->addr; return 0; } int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map, bool no_kcore) { struct kmap *kmap = map__kmap(map); u64 delta = 0; if (symbol__restricted_filename(filename, "/proc/kallsyms")) return -1; if (!kmap || !kmap->kmaps) return -1; if (dso__load_all_kallsyms(dso, filename) < 0) return -1; if (kallsyms__delta(kmap, filename, &delta)) return -1; symbols__fixup_end(&dso->symbols, true); symbols__fixup_duplicate(&dso->symbols); if (dso->kernel == DSO_SPACE__KERNEL_GUEST) dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; else dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; if (!no_kcore && !dso__load_kcore(dso, map, filename)) return maps__split_kallsyms_for_kcore(kmap->kmaps, dso); else return maps__split_kallsyms(kmap->kmaps, dso, delta, map); } int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map) { return __dso__load_kallsyms(dso, filename, map, false); } static int dso__load_perf_map(const char *map_path, struct dso *dso) { char *line = NULL; size_t n; FILE *file; int nr_syms = 0; file = fopen(map_path, "r"); if (file == NULL) goto out_failure; while (!feof(file)) { u64 start, size; struct symbol *sym; int line_len, len; line_len = getline(&line, &n, file); if (line_len < 0) break; if (!line) goto out_failure; line[--line_len] = '\0'; /* \n */ len = hex2u64(line, &start); len++; if (len + 2 >= line_len) continue; len += hex2u64(line + len, &size); len++; if (len + 2 >= line_len) continue; sym = symbol__new(start, size, STB_GLOBAL, STT_FUNC, line + len); if (sym == NULL) goto out_delete_line; symbols__insert(&dso->symbols, sym); nr_syms++; } free(line); fclose(file); return nr_syms; out_delete_line: free(line); out_failure: return -1; } #ifdef HAVE_LIBBFD_SUPPORT #define PACKAGE 'perf' #include <bfd.h> static int bfd_symbols__cmpvalue(const void *a, const void *b) { const asymbol *as = *(const asymbol **)a, *bs = *(const asymbol **)b; if (bfd_asymbol_value(as) != bfd_asymbol_value(bs)) return bfd_asymbol_value(as) - bfd_asymbol_value(bs); return bfd_asymbol_name(as)[0] - bfd_asymbol_name(bs)[0]; } static int bfd2elf_binding(asymbol *symbol) { if (symbol->flags & BSF_WEAK) return STB_WEAK; if (symbol->flags & BSF_GLOBAL) return STB_GLOBAL; if (symbol->flags & BSF_LOCAL) return STB_LOCAL; return -1; } int dso__load_bfd_symbols(struct dso *dso, const char *debugfile) { int err = -1; long symbols_size, symbols_count, i; asection *section; asymbol **symbols, *sym; struct symbol *symbol; bfd *abfd; u64 start, len; abfd = bfd_openr(debugfile, NULL); if (!abfd) return -1; if (!bfd_check_format(abfd, bfd_object)) { pr_debug2("%s: cannot read %s bfd file.\n", __func__, dso->long_name); goto out_close; } if (bfd_get_flavour(abfd) == bfd_target_elf_flavour) goto out_close; symbols_size = bfd_get_symtab_upper_bound(abfd); if (symbols_size == 0) { bfd_close(abfd); return 0; } if (symbols_size < 0) goto out_close; symbols = malloc(symbols_size); if (!symbols) goto out_close; symbols_count = bfd_canonicalize_symtab(abfd, symbols); if (symbols_count < 0) goto out_free; section = bfd_get_section_by_name(abfd, ".text"); if (section) { for (i = 0; i < symbols_count; ++i) { if (!strcmp(bfd_asymbol_name(symbols[i]), "__ImageBase") || !strcmp(bfd_asymbol_name(symbols[i]), "__image_base__")) break; } if (i < symbols_count) { /* PE symbols can only have 4 bytes, so use .text high bits */ dso->text_offset = section->vma - (u32)section->vma; dso->text_offset += (u32)bfd_asymbol_value(symbols[i]); dso->text_end = (section->vma - dso->text_offset) + section->size; } else { dso->text_offset = section->vma - section->filepos; dso->text_end = section->filepos + section->size; } } qsort(symbols, symbols_count, sizeof(asymbol *), bfd_symbols__cmpvalue); #ifdef bfd_get_section #define bfd_asymbol_section bfd_get_section #endif for (i = 0; i < symbols_count; ++i) { sym = symbols[i]; section = bfd_asymbol_section(sym); if (bfd2elf_binding(sym) < 0) continue; while (i + 1 < symbols_count && bfd_asymbol_section(symbols[i + 1]) == section && bfd2elf_binding(symbols[i + 1]) < 0) i++; if (i + 1 < symbols_count && bfd_asymbol_section(symbols[i + 1]) == section) len = symbols[i + 1]->value - sym->value; else len = section->size - sym->value; start = bfd_asymbol_value(sym) - dso->text_offset; symbol = symbol__new(start, len, bfd2elf_binding(sym), STT_FUNC, bfd_asymbol_name(sym)); if (!symbol) goto out_free; symbols__insert(&dso->symbols, symbol); } #ifdef bfd_get_section #undef bfd_asymbol_section #endif symbols__fixup_end(&dso->symbols, false); symbols__fixup_duplicate(&dso->symbols); dso->adjust_symbols = 1; err = 0; out_free: free(symbols); out_close: bfd_close(abfd); return err; } #endif static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, enum dso_binary_type type) { switch (type) { case DSO_BINARY_TYPE__JAVA_JIT: case DSO_BINARY_TYPE__DEBUGLINK: case DSO_BINARY_TYPE__SYSTEM_PATH_DSO: case DSO_BINARY_TYPE__FEDORA_DEBUGINFO: case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO: case DSO_BINARY_TYPE__MIXEDUP_UBUNTU_DEBUGINFO: case DSO_BINARY_TYPE__BUILDID_DEBUGINFO: case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO: return !kmod && dso->kernel == DSO_SPACE__USER; case DSO_BINARY_TYPE__KALLSYMS: case DSO_BINARY_TYPE__VMLINUX: case DSO_BINARY_TYPE__KCORE: return dso->kernel == DSO_SPACE__KERNEL; case DSO_BINARY_TYPE__GUEST_KALLSYMS: case DSO_BINARY_TYPE__GUEST_VMLINUX: case DSO_BINARY_TYPE__GUEST_KCORE: return dso->kernel == DSO_SPACE__KERNEL_GUEST; case DSO_BINARY_TYPE__GUEST_KMODULE: case DSO_BINARY_TYPE__GUEST_KMODULE_COMP: case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE: case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP: /* * kernel modules know their symtab type - it's set when * creating a module dso in machine__addnew_module_map(). */ return kmod && dso->symtab_type == type; case DSO_BINARY_TYPE__BUILD_ID_CACHE: case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO: return true; case DSO_BINARY_TYPE__BPF_PROG_INFO: case DSO_BINARY_TYPE__BPF_IMAGE: case DSO_BINARY_TYPE__OOL: case DSO_BINARY_TYPE__NOT_FOUND: default: return false; } } /* Checks for the existence of the perf-<pid>.map file in two different * locations. First, if the process is a separate mount namespace, check in * that namespace using the pid of the innermost pid namespace. If's not in a * namespace, or the file can't be found there, try in the mount namespace of * the tracing process using our view of its pid. */ static int dso__find_perf_map(char *filebuf, size_t bufsz, struct nsinfo **nsip) { struct nscookie nsc; struct nsinfo *nsi; struct nsinfo *nnsi; int rc = -1; nsi = *nsip; if (nsinfo__need_setns(nsi)) { snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__nstgid(nsi)); nsinfo__mountns_enter(nsi, &nsc); rc = access(filebuf, R_OK); nsinfo__mountns_exit(&nsc); if (rc == 0) return rc; } nnsi = nsinfo__copy(nsi); if (nnsi) { nsinfo__put(nsi); nsinfo__clear_need_setns(nnsi); snprintf(filebuf, bufsz, "/tmp/perf-%d.map", nsinfo__tgid(nnsi)); *nsip = nnsi; rc = 0; } return rc; } int dso__load(struct dso *dso, struct map *map) { char *name; int ret = -1; u_int i; struct machine *machine = NULL; char *root_dir = (char *) ""; int ss_pos = 0; struct symsrc ss_[2]; struct symsrc *syms_ss = NULL, *runtime_ss = NULL; bool kmod; bool perfmap; struct build_id bid; struct nscookie nsc; char newmapname[PATH_MAX]; const char *map_path = dso->long_name; mutex_lock(&dso->lock); perfmap = strncmp(dso->name, "/tmp/perf-", 10) == 0; if (perfmap) { if (dso->nsinfo && (dso__find_perf_map(newmapname, sizeof(newmapname), &dso->nsinfo) == 0)) { map_path = newmapname; } } nsinfo__mountns_enter(dso->nsinfo, &nsc); /* check again under the dso->lock */ if (dso__loaded(dso)) { ret = 1; goto out; } kmod = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP || dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE || dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP; if (dso->kernel && !kmod) { if (dso->kernel == DSO_SPACE__KERNEL) ret = dso__load_kernel_sym(dso, map); else if (dso->kernel == DSO_SPACE__KERNEL_GUEST) ret = dso__load_guest_kernel_sym(dso, map); machine = maps__machine(map__kmaps(map)); if (machine__is(machine, "x86_64")) machine__map_x86_64_entry_trampolines(machine, dso); goto out; } dso->adjust_symbols = 0; if (perfmap) { ret = dso__load_perf_map(map_path, dso); dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : DSO_BINARY_TYPE__NOT_FOUND; goto out; } if (machine) root_dir = machine->root_dir; name = malloc(PATH_MAX); if (!name) goto out; /* * Read the build id if possible. This is required for * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work */ if (!dso->has_build_id && is_regular_file(dso->long_name)) { __symbol__join_symfs(name, PATH_MAX, dso->long_name); if (filename__read_build_id(name, &bid) > 0) dso__set_build_id(dso, &bid); } /* * Iterate over candidate debug images. * Keep track of "interesting" ones (those which have a symtab, dynsym, * and/or opd section) for processing. */ for (i = 0; i < DSO_BINARY_TYPE__SYMTAB_CNT; i++) { struct symsrc *ss = &ss_[ss_pos]; bool next_slot = false; bool is_reg; bool nsexit; int bfdrc = -1; int sirc = -1; enum dso_binary_type symtab_type = binary_type_symtab[i]; nsexit = (symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE || symtab_type == DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO); if (!dso__is_compatible_symtab_type(dso, kmod, symtab_type)) continue; if (dso__read_binary_type_filename(dso, symtab_type, root_dir, name, PATH_MAX)) continue; if (nsexit) nsinfo__mountns_exit(&nsc); is_reg = is_regular_file(name); if (!is_reg && errno == ENOENT && dso->nsinfo) { char *new_name = dso__filename_with_chroot(dso, name); if (new_name) { is_reg = is_regular_file(new_name); strlcpy(name, new_name, PATH_MAX); free(new_name); } } #ifdef HAVE_LIBBFD_SUPPORT if (is_reg) bfdrc = dso__load_bfd_symbols(dso, name); #endif if (is_reg && bfdrc < 0) sirc = symsrc__init(ss, dso, name, symtab_type); if (nsexit) nsinfo__mountns_enter(dso->nsinfo, &nsc); if (bfdrc == 0) { ret = 0; break; } if (!is_reg || sirc < 0) continue; if (!syms_ss && symsrc__has_symtab(ss)) { syms_ss = ss; next_slot = true; if (!dso->symsrc_filename) dso->symsrc_filename = strdup(name); } if (!runtime_ss && symsrc__possibly_runtime(ss)) { runtime_ss = ss; next_slot = true; } if (next_slot) { ss_pos++; if (syms_ss && runtime_ss) break; } else { symsrc__destroy(ss); } } if (!runtime_ss && !syms_ss) goto out_free; if (runtime_ss && !syms_ss) { syms_ss = runtime_ss; } /* We'll have to hope for the best */ if (!runtime_ss && syms_ss) runtime_ss = syms_ss; if (syms_ss) ret = dso__load_sym(dso, map, syms_ss, runtime_ss, kmod); else ret = -1; if (ret > 0) { int nr_plt; nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss); if (nr_plt > 0) ret += nr_plt; } for (; ss_pos > 0; ss_pos--) symsrc__destroy(&ss_[ss_pos - 1]); out_free: free(name); if (ret < 0 && strstr(dso->name, " (deleted)") != NULL) ret = 0; out: dso__set_loaded(dso); mutex_unlock(&dso->lock); nsinfo__mountns_exit(&nsc); return ret; } int dso__load_vmlinux(struct dso *dso, struct map *map, const char *vmlinux, bool vmlinux_allocated) { int err = -1; struct symsrc ss; char symfs_vmlinux[PATH_MAX]; enum dso_binary_type symtab_type; if (vmlinux[0] == '/') snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s", vmlinux); else symbol__join_symfs(symfs_vmlinux, vmlinux); if (dso->kernel == DSO_SPACE__KERNEL_GUEST) symtab_type = DSO_BINARY_TYPE__GUEST_VMLINUX; else symtab_type = DSO_BINARY_TYPE__VMLINUX; if (symsrc__init(&ss, dso, symfs_vmlinux, symtab_type)) return -1; /* * dso__load_sym() may copy 'dso' which will result in the copies having * an incorrect long name unless we set it here first. */ dso__set_long_name(dso, vmlinux, vmlinux_allocated); if (dso->kernel == DSO_SPACE__KERNEL_GUEST) dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX; else dso->binary_type = DSO_BINARY_TYPE__VMLINUX; err = dso__load_sym(dso, map, &ss, &ss, 0); symsrc__destroy(&ss); if (err > 0) { dso__set_loaded(dso); pr_debug("Using %s for symbols\n", symfs_vmlinux); } return err; } int dso__load_vmlinux_path(struct dso *dso, struct map *map) { int i, err = 0; char *filename = NULL; pr_debug("Looking at the vmlinux_path (%d entries long)\n", vmlinux_path__nr_entries + 1); for (i = 0; i < vmlinux_path__nr_entries; ++i) { err = dso__load_vmlinux(dso, map, vmlinux_path[i], false); if (err > 0) goto out; } if (!symbol_conf.ignore_vmlinux_buildid) filename = dso__build_id_filename(dso, NULL, 0, false); if (filename != NULL) { err = dso__load_vmlinux(dso, map, filename, true); if (err > 0) goto out; free(filename); } out: return err; } static bool visible_dir_filter(const char *name, struct dirent *d) { if (d->d_type != DT_DIR) return false; return lsdir_no_dot_filter(name, d); } static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz) { char kallsyms_filename[PATH_MAX]; int ret = -1; struct strlist *dirs; struct str_node *nd; dirs = lsdir(dir, visible_dir_filter); if (!dirs) return -1; strlist__for_each_entry(nd, dirs) { scnprintf(kallsyms_filename, sizeof(kallsyms_filename), "%s/%s/kallsyms", dir, nd->s); if (!validate_kcore_addresses(kallsyms_filename, map)) { strlcpy(dir, kallsyms_filename, dir_sz); ret = 0; break; } } strlist__delete(dirs); return ret; } /* * Use open(O_RDONLY) to check readability directly instead of access(R_OK) * since access(R_OK) only checks with real UID/GID but open() use effective * UID/GID and actual capabilities (e.g. /proc/kcore requires CAP_SYS_RAWIO). */ static bool filename__readable(const char *file) { int fd = open(file, O_RDONLY); if (fd < 0) return false; close(fd); return true; } static char *dso__find_kallsyms(struct dso *dso, struct map *map) { struct build_id bid; char sbuild_id[SBUILD_ID_SIZE]; bool is_host = false; char path[PATH_MAX]; if (!dso->has_build_id) { /* * Last resort, if we don't have a build-id and couldn't find * any vmlinux file, try the running kernel kallsyms table. */ goto proc_kallsyms; } if (sysfs__read_build_id("/sys/kernel/notes", &bid) == 0) is_host = dso__build_id_equal(dso, &bid); /* Try a fast path for /proc/kallsyms if possible */ if (is_host) { /* * Do not check the build-id cache, unless we know we cannot use * /proc/kcore or module maps don't match to /proc/kallsyms. * To check readability of /proc/kcore, do not use access(R_OK) * since /proc/kcore requires CAP_SYS_RAWIO to read and access * can't check it. */ if (filename__readable("/proc/kcore") && !validate_kcore_addresses("/proc/kallsyms", map)) goto proc_kallsyms; } build_id__sprintf(&dso->bid, sbuild_id); /* Find kallsyms in build-id cache with kcore */ scnprintf(path, sizeof(path), "%s/%s/%s", buildid_dir, DSO__NAME_KCORE, sbuild_id); if (!find_matching_kcore(map, path, sizeof(path))) return strdup(path); /* Use current /proc/kallsyms if possible */ if (is_host) { proc_kallsyms: return strdup("/proc/kallsyms"); } /* Finally, find a cache of kallsyms */ if (!build_id_cache__kallsyms_path(sbuild_id, path, sizeof(path))) { pr_err("No kallsyms or vmlinux with build-id %s was found\n", sbuild_id); return NULL; } return strdup(path); } static int dso__load_kernel_sym(struct dso *dso, struct map *map) { int err; const char *kallsyms_filename = NULL; char *kallsyms_allocated_filename = NULL; char *filename = NULL; /* * Step 1: if the user specified a kallsyms or vmlinux filename, use * it and only it, reporting errors to the user if it cannot be used. * * For instance, try to analyse an ARM perf.data file _without_ a * build-id, or if the user specifies the wrong path to the right * vmlinux file, obviously we can't fallback to another vmlinux (a * x86_86 one, on the machine where analysis is being performed, say), * or worse, /proc/kallsyms. * * If the specified file _has_ a build-id and there is a build-id * section in the perf.data file, we will still do the expected * validation in dso__load_vmlinux and will bail out if they don't * match. */ if (symbol_conf.kallsyms_name != NULL) { kallsyms_filename = symbol_conf.kallsyms_name; goto do_kallsyms; } if (!symbol_conf.ignore_vmlinux && symbol_conf.vmlinux_name != NULL) { return dso__load_vmlinux(dso, map, symbol_conf.vmlinux_name, false); } /* * Before checking on common vmlinux locations, check if it's * stored as standard build id binary (not kallsyms) under * .debug cache. */ if (!symbol_conf.ignore_vmlinux_buildid) filename = __dso__build_id_filename(dso, NULL, 0, false, false); if (filename != NULL) { err = dso__load_vmlinux(dso, map, filename, true); if (err > 0) return err; free(filename); } if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) { err = dso__load_vmlinux_path(dso, map); if (err > 0) return err; } /* do not try local files if a symfs was given */ if (symbol_conf.symfs[0] != 0) return -1; kallsyms_allocated_filename = dso__find_kallsyms(dso, map); if (!kallsyms_allocated_filename) return -1; kallsyms_filename = kallsyms_allocated_filename; do_kallsyms: err = dso__load_kallsyms(dso, kallsyms_filename, map); if (err > 0) pr_debug("Using %s for symbols\n", kallsyms_filename); free(kallsyms_allocated_filename); if (err > 0 && !dso__is_kcore(dso)) { dso->binary_type = DSO_BINARY_TYPE__KALLSYMS; dso__set_long_name(dso, DSO__NAME_KALLSYMS, false); map__fixup_start(map); map__fixup_end(map); } return err; } static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map) { int err; const char *kallsyms_filename; struct machine *machine = maps__machine(map__kmaps(map)); char path[PATH_MAX]; if (machine->kallsyms_filename) { kallsyms_filename = machine->kallsyms_filename; } else if (machine__is_default_guest(machine)) { /* * if the user specified a vmlinux filename, use it and only * it, reporting errors to the user if it cannot be used. * Or use file guest_kallsyms inputted by user on commandline */ if (symbol_conf.default_guest_vmlinux_name != NULL) { err = dso__load_vmlinux(dso, map, symbol_conf.default_guest_vmlinux_name, false); return err; } kallsyms_filename = symbol_conf.default_guest_kallsyms; if (!kallsyms_filename) return -1; } else { sprintf(path, "%s/proc/kallsyms", machine->root_dir); kallsyms_filename = path; } err = dso__load_kallsyms(dso, kallsyms_filename, map); if (err > 0) pr_debug("Using %s for symbols\n", kallsyms_filename); if (err > 0 && !dso__is_kcore(dso)) { dso->binary_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; dso__set_long_name(dso, machine->mmap_name, false); map__fixup_start(map); map__fixup_end(map); } return err; } static void vmlinux_path__exit(void) { while (--vmlinux_path__nr_entries >= 0) zfree(&vmlinux_path[vmlinux_path__nr_entries]); vmlinux_path__nr_entries = 0; zfree(&vmlinux_path); } static const char * const vmlinux_paths[] = { "vmlinux", "/boot/vmlinux" }; static const char * const vmlinux_paths_upd[] = { "/boot/vmlinux-%s", "/usr/lib/debug/boot/vmlinux-%s", "/lib/modules/%s/build/vmlinux", "/usr/lib/debug/lib/modules/%s/vmlinux", "/usr/lib/debug/boot/vmlinux-%s.debug" }; static int vmlinux_path__add(const char *new_entry) { vmlinux_path[vmlinux_path__nr_entries] = strdup(new_entry); if (vmlinux_path[vmlinux_path__nr_entries] == NULL) return -1; ++vmlinux_path__nr_entries; return 0; } static int vmlinux_path__init(struct perf_env *env) { struct utsname uts; char bf[PATH_MAX]; char *kernel_version; unsigned int i; vmlinux_path = malloc(sizeof(char *) * (ARRAY_SIZE(vmlinux_paths) + ARRAY_SIZE(vmlinux_paths_upd))); if (vmlinux_path == NULL) return -1; for (i = 0; i < ARRAY_SIZE(vmlinux_paths); i++) if (vmlinux_path__add(vmlinux_paths[i]) < 0) goto out_fail; /* only try kernel version if no symfs was given */ if (symbol_conf.symfs[0] != 0) return 0; if (env) { kernel_version = env->os_release; } else { if (uname(&uts) < 0) goto out_fail; kernel_version = uts.release; } for (i = 0; i < ARRAY_SIZE(vmlinux_paths_upd); i++) { snprintf(bf, sizeof(bf), vmlinux_paths_upd[i], kernel_version); if (vmlinux_path__add(bf) < 0) goto out_fail; } return 0; out_fail: vmlinux_path__exit(); return -1; } int setup_list(struct strlist **list, const char *list_str, const char *list_name) { if (list_str == NULL) return 0; *list = strlist__new(list_str, NULL); if (!*list) { pr_err("problems parsing %s list\n", list_name); return -1; } symbol_conf.has_filter = true; return 0; } int setup_intlist(struct intlist **list, const char *list_str, const char *list_name) { if (list_str == NULL) return 0; *list = intlist__new(list_str); if (!*list) { pr_err("problems parsing %s list\n", list_name); return -1; } return 0; } static int setup_addrlist(struct intlist **addr_list, struct strlist *sym_list) { struct str_node *pos, *tmp; unsigned long val; char *sep; const char *end; int i = 0, err; *addr_list = intlist__new(NULL); if (!*addr_list) return -1; strlist__for_each_entry_safe(pos, tmp, sym_list) { errno = 0; val = strtoul(pos->s, &sep, 16); if (errno || (sep == pos->s)) continue; if (*sep != '\0') { end = pos->s + strlen(pos->s) - 1; while (end >= sep && isspace(*end)) end--; if (end >= sep) continue; } err = intlist__add(*addr_list, val); if (err) break; strlist__remove(sym_list, pos); i++; } if (i == 0) { intlist__delete(*addr_list); *addr_list = NULL; } return 0; } static bool symbol__read_kptr_restrict(void) { bool value = false; FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); if (fp != NULL) { char line[8]; if (fgets(line, sizeof(line), fp) != NULL) value = perf_cap__capable(CAP_SYSLOG) ? (atoi(line) >= 2) : (atoi(line) != 0); fclose(fp); } /* Per kernel/kallsyms.c: * we also restrict when perf_event_paranoid > 1 w/o CAP_SYSLOG */ if (perf_event_paranoid() > 1 && !perf_cap__capable(CAP_SYSLOG)) value = true; return value; } int symbol__annotation_init(void) { if (symbol_conf.init_annotation) return 0; if (symbol_conf.initialized) { pr_err("Annotation needs to be init before symbol__init()\n"); return -1; } symbol_conf.priv_size += sizeof(struct annotation); symbol_conf.init_annotation = true; return 0; } int symbol__init(struct perf_env *env) { const char *symfs; if (symbol_conf.initialized) return 0; symbol_conf.priv_size = PERF_ALIGN(symbol_conf.priv_size, sizeof(u64)); symbol__elf_init(); if (symbol_conf.try_vmlinux_path && vmlinux_path__init(env) < 0) return -1; if (symbol_conf.field_sep && *symbol_conf.field_sep == '.') { pr_err("'.' is the only non valid --field-separator argument\n"); return -1; } if (setup_list(&symbol_conf.dso_list, symbol_conf.dso_list_str, "dso") < 0) return -1; if (setup_list(&symbol_conf.comm_list, symbol_conf.comm_list_str, "comm") < 0) goto out_free_dso_list; if (setup_intlist(&symbol_conf.pid_list, symbol_conf.pid_list_str, "pid") < 0) goto out_free_comm_list; if (setup_intlist(&symbol_conf.tid_list, symbol_conf.tid_list_str, "tid") < 0) goto out_free_pid_list; if (setup_list(&symbol_conf.sym_list, symbol_conf.sym_list_str, "symbol") < 0) goto out_free_tid_list; if (symbol_conf.sym_list && setup_addrlist(&symbol_conf.addr_list, symbol_conf.sym_list) < 0) goto out_free_sym_list; if (setup_list(&symbol_conf.bt_stop_list, symbol_conf.bt_stop_list_str, "symbol") < 0) goto out_free_sym_list; /* * A path to symbols of "/" is identical to "" * reset here for simplicity. */ symfs = realpath(symbol_conf.symfs, NULL); if (symfs == NULL) symfs = symbol_conf.symfs; if (strcmp(symfs, "/") == 0) symbol_conf.symfs = ""; if (symfs != symbol_conf.symfs) free((void *)symfs); symbol_conf.kptr_restrict = symbol__read_kptr_restrict(); symbol_conf.initialized = true; return 0; out_free_sym_list: strlist__delete(symbol_conf.sym_list); intlist__delete(symbol_conf.addr_list); out_free_tid_list: intlist__delete(symbol_conf.tid_list); out_free_pid_list: intlist__delete(symbol_conf.pid_list); out_free_comm_list: strlist__delete(symbol_conf.comm_list); out_free_dso_list: strlist__delete(symbol_conf.dso_list); return -1; } void symbol__exit(void) { if (!symbol_conf.initialized) return; strlist__delete(symbol_conf.bt_stop_list); strlist__delete(symbol_conf.sym_list); strlist__delete(symbol_conf.dso_list); strlist__delete(symbol_conf.comm_list); intlist__delete(symbol_conf.tid_list); intlist__delete(symbol_conf.pid_list); intlist__delete(symbol_conf.addr_list); vmlinux_path__exit(); symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; symbol_conf.bt_stop_list = NULL; symbol_conf.initialized = false; } int symbol__config_symfs(const struct option *opt __maybe_unused, const char *dir, int unset __maybe_unused) { char *bf = NULL; int ret; symbol_conf.symfs = strdup(dir); if (symbol_conf.symfs == NULL) return -ENOMEM; /* skip the locally configured cache if a symfs is given, and * config buildid dir to symfs/.debug */ ret = asprintf(&bf, "%s/%s", dir, ".debug"); if (ret < 0) return -ENOMEM; set_buildid_dir(bf); free(bf); return 0; } struct mem_info *mem_info__get(struct mem_info *mi) { if (mi) refcount_inc(&mi->refcnt); return mi; } void mem_info__put(struct mem_info *mi) { if (mi && refcount_dec_and_test(&mi->refcnt)) { addr_map_symbol__exit(&mi->iaddr); addr_map_symbol__exit(&mi->daddr); free(mi); } } struct mem_info *mem_info__new(void) { struct mem_info *mi = zalloc(sizeof(*mi)); if (mi) refcount_set(&mi->refcnt, 1); return mi; } /* * Checks that user supplied symbol kernel files are accessible because * the default mechanism for accessing elf files fails silently. i.e. if * debug syms for a build ID aren't found perf carries on normally. When * they are user supplied we should assume that the user doesn't want to * silently fail. */ int symbol__validate_sym_arguments(void) { if (symbol_conf.vmlinux_name && access(symbol_conf.vmlinux_name, R_OK)) { pr_err("Invalid file: %s\n", symbol_conf.vmlinux_name); return -EINVAL; } if (symbol_conf.kallsyms_name && access(symbol_conf.kallsyms_name, R_OK)) { pr_err("Invalid file: %s\n", symbol_conf.kallsyms_name); return -EINVAL; } return 0; }
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