| #include <dirent.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/param.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <inttypes.h> |
| #include "build-id.h" |
| #include "util.h" |
| #include "debug.h" |
| #include "machine.h" |
| #include "symbol.h" |
| #include "strlist.h" |
| #include "intlist.h" |
| #include "header.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, |
| symbol_filter_t filter); |
| static int dso__load_guest_kernel_sym(struct dso *dso, struct map *map, |
| symbol_filter_t filter); |
| int vmlinux_path__nr_entries; |
| char **vmlinux_path; |
| |
| struct symbol_conf symbol_conf = { |
| .use_modules = true, |
| .try_vmlinux_path = true, |
| .annotate_src = true, |
| .demangle = true, |
| .demangle_kernel = false, |
| .cumulate_callchain = true, |
| .show_hist_headers = true, |
| .symfs = "", |
| }; |
| |
| 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__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__NOT_FOUND, |
| }; |
| |
| #define DSO_BINARY_TYPE__SYMTAB_CNT ARRAY_SIZE(binary_type_symtab) |
| |
| bool symbol_type__is_a(char symbol_type, enum map_type map_type) |
| { |
| symbol_type = toupper(symbol_type); |
| |
| switch (map_type) { |
| case MAP__FUNCTION: |
| return symbol_type == 'T' || symbol_type == 'W'; |
| case MAP__VARIABLE: |
| return symbol_type == 'D'; |
| default: |
| return false; |
| } |
| } |
| |
| static int prefix_underscores_count(const char *str) |
| { |
| const char *tail = str; |
| |
| while (*tail == '_') |
| tail++; |
| |
| return tail - str; |
| } |
| |
| 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 *symbols) |
| { |
| struct rb_node *nd; |
| struct symbol *curr, *next; |
| |
| nd = rb_first(symbols); |
| |
| while (nd) { |
| curr = rb_entry(nd, struct symbol, rb_node); |
| again: |
| nd = rb_next(&curr->rb_node); |
| next = rb_entry(nd, struct symbol, rb_node); |
| |
| if (!nd) |
| break; |
| |
| if (curr->start != next->start) |
| continue; |
| |
| if (choose_best_symbol(curr, next) == SYMBOL_A) { |
| rb_erase(&next->rb_node, symbols); |
| symbol__delete(next); |
| goto again; |
| } else { |
| nd = rb_next(&curr->rb_node); |
| rb_erase(&curr->rb_node, symbols); |
| symbol__delete(curr); |
| } |
| } |
| } |
| |
| void symbols__fixup_end(struct rb_root *symbols) |
| { |
| struct rb_node *nd, *prevnd = rb_first(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); |
| |
| if (prev->end == prev->start && prev->end != curr->start) |
| prev->end = curr->start; |
| } |
| |
| /* Last entry */ |
| if (curr->end == curr->start) |
| curr->end = roundup(curr->start, 4096); |
| } |
| |
| void __map_groups__fixup_end(struct map_groups *mg, enum map_type type) |
| { |
| struct maps *maps = &mg->maps[type]; |
| struct map *next, *curr; |
| |
| pthread_rwlock_wrlock(&maps->lock); |
| |
| curr = maps__first(maps); |
| if (curr == NULL) |
| goto out_unlock; |
| |
| for (next = map__next(curr); next; next = map__next(curr)) { |
| curr->end = next->start; |
| curr = next; |
| } |
| |
| /* |
| * We still haven't the actual symbols, so guess the |
| * last map final address. |
| */ |
| curr->end = ~0ULL; |
| |
| out_unlock: |
| pthread_rwlock_unlock(&maps->lock); |
| } |
| |
| struct symbol *symbol__new(u64 start, u64 len, u8 binding, 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) |
| sym = ((void *)sym) + symbol_conf.priv_size; |
| |
| sym->start = start; |
| sym->end = len ? start + len : start; |
| 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) |
| { |
| free(((void *)sym) - symbol_conf.priv_size); |
| } |
| |
| size_t symbol__fprintf(struct symbol *sym, FILE *fp) |
| { |
| return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %c %s\n", |
| sym->start, sym->end, |
| sym->binding == STB_GLOBAL ? 'g' : |
| sym->binding == STB_LOCAL ? 'l' : 'w', |
| sym->name); |
| } |
| |
| size_t symbol__fprintf_symname_offs(const struct symbol *sym, |
| const struct addr_location *al, FILE *fp) |
| { |
| unsigned long offset; |
| size_t length; |
| |
| if (sym && sym->name) { |
| length = fprintf(fp, "%s", sym->name); |
| if (al) { |
| if (al->addr < sym->end) |
| offset = al->addr - sym->start; |
| else |
| offset = al->addr - al->map->start - sym->start; |
| length += fprintf(fp, "+0x%lx", offset); |
| } |
| return length; |
| } else |
| return fprintf(fp, "[unknown]"); |
| } |
| |
| size_t symbol__fprintf_symname(const struct symbol *sym, FILE *fp) |
| { |
| return symbol__fprintf_symname_offs(sym, NULL, fp); |
| } |
| |
| void symbols__delete(struct rb_root *symbols) |
| { |
| struct symbol *pos; |
| struct rb_node *next = rb_first(symbols); |
| |
| while (next) { |
| pos = rb_entry(next, struct symbol, rb_node); |
| next = rb_next(&pos->rb_node); |
| rb_erase(&pos->rb_node, symbols); |
| symbol__delete(pos); |
| } |
| } |
| |
| void symbols__insert(struct rb_root *symbols, struct symbol *sym) |
| { |
| struct rb_node **p = &symbols->rb_node; |
| struct rb_node *parent = NULL; |
| const u64 ip = sym->start; |
| struct symbol *s; |
| |
| 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; |
| } |
| rb_link_node(&sym->rb_node, parent, p); |
| rb_insert_color(&sym->rb_node, symbols); |
| } |
| |
| static struct symbol *symbols__find(struct rb_root *symbols, u64 ip) |
| { |
| struct rb_node *n; |
| |
| if (symbols == NULL) |
| return NULL; |
| |
| n = symbols->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) |
| n = n->rb_right; |
| else |
| return s; |
| } |
| |
| return NULL; |
| } |
| |
| static struct symbol *symbols__first(struct rb_root *symbols) |
| { |
| struct rb_node *n = rb_first(symbols); |
| |
| 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; |
| } |
| |
| struct symbol_name_rb_node { |
| struct rb_node rb_node; |
| struct symbol sym; |
| }; |
| |
| static void symbols__insert_by_name(struct rb_root *symbols, struct symbol *sym) |
| { |
| struct rb_node **p = &symbols->rb_node; |
| struct rb_node *parent = NULL; |
| struct symbol_name_rb_node *symn, *s; |
| |
| symn = container_of(sym, struct symbol_name_rb_node, sym); |
| |
| while (*p != NULL) { |
| parent = *p; |
| s = rb_entry(parent, struct symbol_name_rb_node, rb_node); |
| if (strcmp(sym->name, s->sym.name) < 0) |
| p = &(*p)->rb_left; |
| else |
| p = &(*p)->rb_right; |
| } |
| rb_link_node(&symn->rb_node, parent, p); |
| rb_insert_color(&symn->rb_node, symbols); |
| } |
| |
| static void symbols__sort_by_name(struct rb_root *symbols, |
| struct rb_root *source) |
| { |
| struct rb_node *nd; |
| |
| for (nd = rb_first(source); nd; nd = rb_next(nd)) { |
| struct symbol *pos = rb_entry(nd, struct symbol, rb_node); |
| symbols__insert_by_name(symbols, pos); |
| } |
| } |
| |
| static struct symbol *symbols__find_by_name(struct rb_root *symbols, |
| const char *name) |
| { |
| struct rb_node *n; |
| struct symbol_name_rb_node *s = NULL; |
| |
| if (symbols == NULL) |
| return NULL; |
| |
| n = symbols->rb_node; |
| |
| while (n) { |
| int cmp; |
| |
| s = rb_entry(n, struct symbol_name_rb_node, rb_node); |
| cmp = arch__compare_symbol_names(name, s->sym.name); |
| |
| if (cmp < 0) |
| n = n->rb_left; |
| else if (cmp > 0) |
| n = n->rb_right; |
| else |
| break; |
| } |
| |
| if (n == NULL) |
| return NULL; |
| |
| /* return first symbol that has same name (if any) */ |
| for (n = rb_prev(n); n; n = rb_prev(n)) { |
| struct symbol_name_rb_node *tmp; |
| |
| tmp = rb_entry(n, struct symbol_name_rb_node, rb_node); |
| if (arch__compare_symbol_names(tmp->sym.name, s->sym.name)) |
| break; |
| |
| s = tmp; |
| } |
| |
| return &s->sym; |
| } |
| |
| void dso__reset_find_symbol_cache(struct dso *dso) |
| { |
| enum map_type type; |
| |
| for (type = MAP__FUNCTION; type <= MAP__VARIABLE; ++type) { |
| dso->last_find_result[type].addr = 0; |
| dso->last_find_result[type].symbol = NULL; |
| } |
| } |
| |
| struct symbol *dso__find_symbol(struct dso *dso, |
| enum map_type type, u64 addr) |
| { |
| if (dso->last_find_result[type].addr != addr) { |
| dso->last_find_result[type].addr = addr; |
| dso->last_find_result[type].symbol = symbols__find(&dso->symbols[type], addr); |
| } |
| |
| return dso->last_find_result[type].symbol; |
| } |
| |
| struct symbol *dso__first_symbol(struct dso *dso, enum map_type type) |
| { |
| return symbols__first(&dso->symbols[type]); |
| } |
| |
| struct symbol *dso__next_symbol(struct symbol *sym) |
| { |
| return symbols__next(sym); |
| } |
| |
| struct symbol *symbol__next_by_name(struct symbol *sym) |
| { |
| struct symbol_name_rb_node *s = container_of(sym, struct symbol_name_rb_node, sym); |
| struct rb_node *n = rb_next(&s->rb_node); |
| |
| return n ? &rb_entry(n, struct symbol_name_rb_node, rb_node)->sym : NULL; |
| } |
| |
| /* |
| * Teturns first symbol that matched with @name. |
| */ |
| struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type, |
| const char *name) |
| { |
| return symbols__find_by_name(&dso->symbol_names[type], name); |
| } |
| |
| void dso__sort_by_name(struct dso *dso, enum map_type type) |
| { |
| dso__set_sorted_by_name(dso, type); |
| return symbols__sort_by_name(&dso->symbol_names[type], |
| &dso->symbols[type]); |
| } |
| |
| size_t dso__fprintf_symbols_by_name(struct dso *dso, |
| enum map_type type, FILE *fp) |
| { |
| size_t ret = 0; |
| struct rb_node *nd; |
| struct symbol_name_rb_node *pos; |
| |
| for (nd = rb_first(&dso->symbol_names[type]); nd; nd = rb_next(nd)) { |
| pos = rb_entry(nd, struct symbol_name_rb_node, rb_node); |
| fprintf(fp, "%s\n", pos->sym.name); |
| } |
| |
| return ret; |
| } |
| |
| int modules__parse(const char *filename, void *arg, |
| int (*process_module)(void *arg, const char *name, |
| u64 start)) |
| { |
| 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; |
| char *sep; |
| 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); |
| |
| err = process_module(arg, name, start); |
| if (err) |
| break; |
| } |
| out: |
| free(line); |
| fclose(file); |
| return err; |
| } |
| |
| struct process_kallsyms_args { |
| struct map *map; |
| struct dso *dso; |
| }; |
| |
| /* |
| * These are symbols in the kernel image, so make sure that |
| * sym is from a kernel DSO. |
| */ |
| bool symbol__is_idle(struct symbol *sym) |
| { |
| const char * const idle_symbols[] = { |
| "cpu_idle", |
| "cpu_startup_entry", |
| "intel_idle", |
| "default_idle", |
| "native_safe_halt", |
| "enter_idle", |
| "exit_idle", |
| "mwait_idle", |
| "mwait_idle_with_hints", |
| "poll_idle", |
| "ppc64_runlatch_off", |
| "pseries_dedicated_idle_sleep", |
| NULL |
| }; |
| |
| int i; |
| |
| if (!sym) |
| return false; |
| |
| for (i = 0; idle_symbols[i]; i++) { |
| if (!strcmp(idle_symbols[i], sym->name)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static int map__process_kallsym_symbol(void *arg, const char *name, |
| char type, u64 start) |
| { |
| struct symbol *sym; |
| struct process_kallsyms_args *a = arg; |
| struct rb_root *root = &a->dso->symbols[a->map->type]; |
| |
| if (!symbol_type__is_a(type, a->map->type)) |
| 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), 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); |
| |
| 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, |
| struct map *map) |
| { |
| struct process_kallsyms_args args = { .map = map, .dso = dso, }; |
| return kallsyms__parse(filename, &args, map__process_kallsym_symbol); |
| } |
| |
| static int dso__split_kallsyms_for_kcore(struct dso *dso, struct map *map, |
| symbol_filter_t filter) |
| { |
| struct map_groups *kmaps = map__kmaps(map); |
| struct map *curr_map; |
| struct symbol *pos; |
| int count = 0; |
| struct rb_root old_root = dso->symbols[map->type]; |
| struct rb_root *root = &dso->symbols[map->type]; |
| struct rb_node *next = rb_first(root); |
| |
| if (!kmaps) |
| return -1; |
| |
| *root = RB_ROOT; |
| |
| while (next) { |
| char *module; |
| |
| pos = rb_entry(next, struct symbol, rb_node); |
| next = rb_next(&pos->rb_node); |
| |
| rb_erase_init(&pos->rb_node, &old_root); |
| |
| module = strchr(pos->name, '\t'); |
| if (module) |
| *module = '\0'; |
| |
| curr_map = map_groups__find(kmaps, map->type, pos->start); |
| |
| if (!curr_map || (filter && filter(curr_map, pos))) { |
| symbol__delete(pos); |
| continue; |
| } |
| |
| pos->start -= curr_map->start - curr_map->pgoff; |
| if (pos->end) |
| pos->end -= curr_map->start - curr_map->pgoff; |
| symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); |
| ++count; |
| } |
| |
| /* 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 dso__split_kallsyms(struct dso *dso, struct map *map, u64 delta, |
| symbol_filter_t filter) |
| { |
| struct map_groups *kmaps = map__kmaps(map); |
| struct machine *machine; |
| struct map *curr_map = map; |
| struct symbol *pos; |
| int count = 0, moved = 0; |
| struct rb_root *root = &dso->symbols[map->type]; |
| struct rb_node *next = rb_first(root); |
| int kernel_range = 0; |
| |
| if (!kmaps) |
| return -1; |
| |
| machine = kmaps->machine; |
| |
| 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) { |
| if (!symbol_conf.use_modules) |
| goto discard_symbol; |
| |
| *module++ = '\0'; |
| |
| if (strcmp(curr_map->dso->short_name, module)) { |
| if (curr_map != map && |
| dso->kernel == DSO_TYPE_GUEST_KERNEL && |
| 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, |
| curr_map->type); |
| } |
| |
| curr_map = map_groups__find_by_name(kmaps, |
| map->type, 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; |
| goto discard_symbol; |
| } |
| |
| 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 map->start. |
| */ |
| pos->start = curr_map->map_ip(curr_map, pos->start); |
| pos->end = curr_map->map_ip(curr_map, pos->end); |
| } else if (curr_map != 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) { |
| curr_map = map; |
| goto filter_symbol; |
| } |
| |
| if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
| 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); |
| if (ndso == NULL) |
| return -1; |
| |
| ndso->kernel = dso->kernel; |
| |
| curr_map = map__new2(pos->start, ndso, map->type); |
| if (curr_map == NULL) { |
| dso__put(ndso); |
| return -1; |
| } |
| |
| curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; |
| map_groups__insert(kmaps, curr_map); |
| ++kernel_range; |
| } else if (delta) { |
| /* Kernel was relocated at boot time */ |
| pos->start -= delta; |
| pos->end -= delta; |
| } |
| filter_symbol: |
| if (filter && filter(curr_map, pos)) { |
| discard_symbol: rb_erase(&pos->rb_node, root); |
| symbol__delete(pos); |
| } else { |
| if (curr_map != map) { |
| rb_erase(&pos->rb_node, root); |
| symbols__insert(&curr_map->dso->symbols[curr_map->type], pos); |
| ++moved; |
| } else |
| ++count; |
| } |
| } |
| |
| if (curr_map != map && |
| dso->kernel == DSO_TYPE_GUEST_KERNEL && |
| machine__is_default_guest(kmaps->machine)) { |
| dso__set_loaded(curr_map->dso, curr_map->type); |
| } |
| |
| 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) |
| { |
| 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(const char *filename, struct map *map, |
| struct map_groups *kmaps) |
| { |
| struct rb_root modules = RB_ROOT; |
| struct map *old_map; |
| int err; |
| |
| err = read_proc_modules(filename, &modules); |
| if (err) |
| return err; |
| |
| old_map = map_groups__first(kmaps, map->type); |
| while (old_map) { |
| struct map *next = map_groups__next(old_map); |
| struct module_info *mi; |
| |
| if (old_map == map || old_map->start == map->start) { |
| /* The kernel map */ |
| old_map = next; |
| continue; |
| } |
| |
| /* Module must be in memory at the same address */ |
| mi = find_module(old_map->dso->short_name, &modules); |
| if (!mi || mi->start != old_map->start) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| old_map = next; |
| } |
| out: |
| 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 map_groups *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, map, 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; |
| |
| start = kallsyms__get_function_start(kallsyms_filename, |
| kmap->ref_reloc_sym->name); |
| if (start != kmap->ref_reloc_sym->addr) |
| return -EINVAL; |
| } |
| |
| return validate_kcore_modules(kallsyms_filename, map); |
| } |
| |
| struct kcore_mapfn_data { |
| struct dso *dso; |
| enum map_type type; |
| struct list_head maps; |
| }; |
| |
| static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data) |
| { |
| struct kcore_mapfn_data *md = data; |
| struct map *map; |
| |
| map = map__new2(start, md->dso, md->type); |
| if (map == NULL) |
| return -ENOMEM; |
| |
| map->end = map->start + len; |
| map->pgoff = pgoff; |
| |
| list_add(&map->node, &md->maps); |
| |
| return 0; |
| } |
| |
| static int dso__load_kcore(struct dso *dso, struct map *map, |
| const char *kallsyms_filename) |
| { |
| struct map_groups *kmaps = map__kmaps(map); |
| struct machine *machine; |
| struct kcore_mapfn_data md; |
| struct map *old_map, *new_map, *replacement_map = NULL; |
| bool is_64_bit; |
| int err, fd; |
| char kcore_filename[PATH_MAX]; |
| struct symbol *sym; |
| |
| if (!kmaps) |
| return -EINVAL; |
| |
| machine = kmaps->machine; |
| |
| /* This function requires that the map is the kernel map */ |
| if (map != machine->vmlinux_maps[map->type]) |
| 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; |
| md.type = map->type; |
| 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, md.type == MAP__FUNCTION, 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 */ |
| old_map = map_groups__first(kmaps, map->type); |
| while (old_map) { |
| struct map *next = map_groups__next(old_map); |
| |
| if (old_map != map) |
| map_groups__remove(kmaps, old_map); |
| old_map = next; |
| } |
| |
| /* Find the kernel map using the first symbol */ |
| sym = dso__first_symbol(dso, map->type); |
| list_for_each_entry(new_map, &md.maps, node) { |
| if (sym && sym->start >= new_map->start && |
| sym->start < new_map->end) { |
| replacement_map = new_map; |
| break; |
| } |
| } |
| |
| if (!replacement_map) |
| replacement_map = list_entry(md.maps.next, struct map, node); |
| |
| /* Add new maps */ |
| while (!list_empty(&md.maps)) { |
| new_map = list_entry(md.maps.next, struct map, node); |
| list_del_init(&new_map->node); |
| if (new_map == replacement_map) { |
| map->start = new_map->start; |
| map->end = new_map->end; |
| map->pgoff = new_map->pgoff; |
| map->map_ip = new_map->map_ip; |
| map->unmap_ip = new_map->unmap_ip; |
| /* Ensure maps are correctly ordered */ |
| map__get(map); |
| map_groups__remove(kmaps, map); |
| map_groups__insert(kmaps, map); |
| map__put(map); |
| } else { |
| map_groups__insert(kmaps, new_map); |
| } |
| |
| map__put(new_map); |
| } |
| |
| /* |
| * Set the data type and long name so that kcore can be read via |
| * dso__data_read_addr(). |
| */ |
| if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
| 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->type == MAP__FUNCTION) |
| 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)) { |
| map = list_entry(md.maps.next, struct map, node); |
| list_del_init(&map->node); |
| map__put(map); |
| } |
| close(fd); |
| return -EINVAL; |
| } |
| |
| /* |
| * 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 map *map, const char *filename, u64 *delta) |
| { |
| struct kmap *kmap = map__kmap(map); |
| u64 addr; |
| |
| if (!kmap) |
| return -1; |
| |
| if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->name) |
| return 0; |
| |
| addr = kallsyms__get_function_start(filename, |
| kmap->ref_reloc_sym->name); |
| if (!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, symbol_filter_t filter) |
| { |
| u64 delta = 0; |
| |
| if (symbol__restricted_filename(filename, "/proc/kallsyms")) |
| return -1; |
| |
| if (dso__load_all_kallsyms(dso, filename, map) < 0) |
| return -1; |
| |
| if (kallsyms__delta(map, filename, &delta)) |
| return -1; |
| |
| symbols__fixup_duplicate(&dso->symbols[map->type]); |
| symbols__fixup_end(&dso->symbols[map->type]); |
| |
| if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
| dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS; |
| else |
| dso->symtab_type = DSO_BINARY_TYPE__KALLSYMS; |
| |
| if (!dso__load_kcore(dso, map, filename)) |
| return dso__split_kallsyms_for_kcore(dso, map, filter); |
| else |
| return dso__split_kallsyms(dso, map, delta, filter); |
| } |
| |
| static int dso__load_perf_map(struct dso *dso, struct map *map, |
| symbol_filter_t filter) |
| { |
| char *line = NULL; |
| size_t n; |
| FILE *file; |
| int nr_syms = 0; |
| |
| file = fopen(dso->long_name, "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, line + len); |
| |
| if (sym == NULL) |
| goto out_delete_line; |
| |
| if (filter && filter(map, sym)) |
| symbol__delete(sym); |
| else { |
| symbols__insert(&dso->symbols[map->type], sym); |
| nr_syms++; |
| } |
| } |
| |
| free(line); |
| fclose(file); |
| |
| return nr_syms; |
| |
| out_delete_line: |
| free(line); |
| out_failure: |
| return -1; |
| } |
| |
| 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__BUILDID_DEBUGINFO: |
| case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO: |
| return !kmod && dso->kernel == DSO_TYPE_USER; |
| |
| case DSO_BINARY_TYPE__KALLSYMS: |
| case DSO_BINARY_TYPE__VMLINUX: |
| case DSO_BINARY_TYPE__KCORE: |
| return dso->kernel == DSO_TYPE_KERNEL; |
| |
| case DSO_BINARY_TYPE__GUEST_KALLSYMS: |
| case DSO_BINARY_TYPE__GUEST_VMLINUX: |
| case DSO_BINARY_TYPE__GUEST_KCORE: |
| return dso->kernel == DSO_TYPE_GUEST_KERNEL; |
| |
| 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__findnew_module_map(). |
| */ |
| return kmod && dso->symtab_type == type; |
| |
| case DSO_BINARY_TYPE__BUILD_ID_CACHE: |
| return true; |
| |
| case DSO_BINARY_TYPE__NOT_FOUND: |
| default: |
| return false; |
| } |
| } |
| |
| int dso__load(struct dso *dso, struct map *map, symbol_filter_t filter) |
| { |
| char *name; |
| int ret = -1; |
| u_int i; |
| struct machine *machine; |
| char *root_dir = (char *) ""; |
| int ss_pos = 0; |
| struct symsrc ss_[2]; |
| struct symsrc *syms_ss = NULL, *runtime_ss = NULL; |
| bool kmod; |
| unsigned char build_id[BUILD_ID_SIZE]; |
| |
| pthread_mutex_lock(&dso->lock); |
| |
| /* check again under the dso->lock */ |
| if (dso__loaded(dso, map->type)) { |
| ret = 1; |
| goto out; |
| } |
| |
| if (dso->kernel) { |
| if (dso->kernel == DSO_TYPE_KERNEL) |
| ret = dso__load_kernel_sym(dso, map, filter); |
| else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
| ret = dso__load_guest_kernel_sym(dso, map, filter); |
| |
| goto out; |
| } |
| |
| if (map->groups && map->groups->machine) |
| machine = map->groups->machine; |
| else |
| machine = NULL; |
| |
| dso->adjust_symbols = 0; |
| |
| if (strncmp(dso->name, "/tmp/perf-", 10) == 0) { |
| struct stat st; |
| |
| if (lstat(dso->name, &st) < 0) |
| goto out; |
| |
| if (!symbol_conf.force && st.st_uid && (st.st_uid != geteuid())) { |
| pr_warning("File %s not owned by current user or root, " |
| "ignoring it (use -f to override).\n", dso->name); |
| goto out; |
| } |
| |
| ret = dso__load_perf_map(dso, map, filter); |
| 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; |
| |
| 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; |
| |
| |
| /* |
| * Read the build id if possible. This is required for |
| * DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work |
| */ |
| if (filename__read_build_id(dso->name, build_id, BUILD_ID_SIZE) > 0) |
| dso__set_build_id(dso, build_id); |
| |
| /* |
| * 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; |
| |
| enum dso_binary_type symtab_type = binary_type_symtab[i]; |
| |
| 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; |
| |
| /* Name is now the name of the next image to try */ |
| if (symsrc__init(ss, dso, name, symtab_type) < 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, filter, kmod); |
| else |
| ret = -1; |
| |
| if (ret > 0) { |
| int nr_plt; |
| |
| nr_plt = dso__synthesize_plt_symbols(dso, runtime_ss, map, filter); |
| 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, map->type); |
| pthread_mutex_unlock(&dso->lock); |
| |
| return ret; |
| } |
| |
| struct map *map_groups__find_by_name(struct map_groups *mg, |
| enum map_type type, const char *name) |
| { |
| struct maps *maps = &mg->maps[type]; |
| struct map *map; |
| |
| pthread_rwlock_rdlock(&maps->lock); |
| |
| for (map = maps__first(maps); map; map = map__next(map)) { |
| if (map->dso && strcmp(map->dso->short_name, name) == 0) |
| goto out_unlock; |
| } |
| |
| map = NULL; |
| |
| out_unlock: |
| pthread_rwlock_unlock(&maps->lock); |
| return map; |
| } |
| |
| int dso__load_vmlinux(struct dso *dso, struct map *map, |
| const char *vmlinux, bool vmlinux_allocated, |
| symbol_filter_t filter) |
| { |
| 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_TYPE_GUEST_KERNEL) |
| 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; |
| |
| err = dso__load_sym(dso, map, &ss, &ss, filter, 0); |
| symsrc__destroy(&ss); |
| |
| if (err > 0) { |
| if (dso->kernel == DSO_TYPE_GUEST_KERNEL) |
| dso->binary_type = DSO_BINARY_TYPE__GUEST_VMLINUX; |
| else |
| dso->binary_type = DSO_BINARY_TYPE__VMLINUX; |
| dso__set_long_name(dso, vmlinux, vmlinux_allocated); |
| dso__set_loaded(dso, map->type); |
| pr_debug("Using %s for symbols\n", symfs_vmlinux); |
| } |
| |
| return err; |
| } |
| |
| int dso__load_vmlinux_path(struct dso *dso, struct map *map, |
| symbol_filter_t filter) |
| { |
| 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, filter); |
| if (err > 0) |
| goto out; |
| } |
| |
| if (!symbol_conf.ignore_vmlinux_buildid) |
| filename = dso__build_id_filename(dso, NULL, 0); |
| if (filename != NULL) { |
| err = dso__load_vmlinux(dso, map, filename, true, filter); |
| if (err > 0) |
| goto out; |
| free(filename); |
| } |
| out: |
| return err; |
| } |
| |
| static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz) |
| { |
| char kallsyms_filename[PATH_MAX]; |
| struct dirent *dent; |
| int ret = -1; |
| DIR *d; |
| |
| d = opendir(dir); |
| if (!d) |
| return -1; |
| |
| while (1) { |
| dent = readdir(d); |
| if (!dent) |
| break; |
| if (dent->d_type != DT_DIR) |
| continue; |
| scnprintf(kallsyms_filename, sizeof(kallsyms_filename), |
| "%s/%s/kallsyms", dir, dent->d_name); |
| if (!validate_kcore_addresses(kallsyms_filename, map)) { |
| strlcpy(dir, kallsyms_filename, dir_sz); |
| ret = 0; |
| break; |
| } |
| } |
| |
| closedir(d); |
| |
| return ret; |
| } |
| |
| static char *dso__find_kallsyms(struct dso *dso, struct map *map) |
| { |
| u8 host_build_id[BUILD_ID_SIZE]; |
| char sbuild_id[BUILD_ID_SIZE * 2 + 1]; |
| 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", host_build_id, |
| sizeof(host_build_id)) == 0) |
| is_host = dso__build_id_equal(dso, host_build_id); |
| |
| build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id); |
| |
| scnprintf(path, sizeof(path), "%s/[kernel.kcore]/%s", buildid_dir, |
| sbuild_id); |
| |
| /* Use /proc/kallsyms if possible */ |
| if (is_host) { |
| DIR *d; |
| int fd; |
| |
| /* If no cached kcore go with /proc/kallsyms */ |
| d = opendir(path); |
| if (!d) |
| goto proc_kallsyms; |
| closedir(d); |
| |
| /* |
| * Do not check the build-id cache, until we know we cannot use |
| * /proc/kcore. |
| */ |
| fd = open("/proc/kcore", O_RDONLY); |
| if (fd != -1) { |
| close(fd); |
| /* If module maps match go with /proc/kallsyms */ |
| if (!validate_kcore_addresses("/proc/kallsyms", map)) |
| goto proc_kallsyms; |
| } |
| |
| /* Find kallsyms in build-id cache with kcore */ |
| if (!find_matching_kcore(map, path, sizeof(path))) |
| return strdup(path); |
| |
| goto proc_kallsyms; |
| } |
| |
| /* Find kallsyms in build-id cache with kcore */ |
| if (!find_matching_kcore(map, path, sizeof(path))) |
| return strdup(path); |
| |
| scnprintf(path, sizeof(path), "%s/[kernel.kallsyms]/%s", |
| buildid_dir, sbuild_id); |
| |
| if (access(path, F_OK)) { |
| pr_err("No kallsyms or vmlinux with build-id %s was found\n", |
| sbuild_id); |
| return NULL; |
| } |
| |
| return strdup(path); |
| |
| proc_kallsyms: |
| return strdup("/proc/kallsyms"); |
| } |
| |
| static int dso__load_kernel_sym(struct dso *dso, struct map *map, |
| symbol_filter_t filter) |
| { |
| int err; |
| const char *kallsyms_filename = NULL; |
| char *kallsyms_allocated_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, filter); |
| } |
| |
| if (!symbol_conf.ignore_vmlinux && vmlinux_path != NULL) { |
| err = dso__load_vmlinux_path(dso, map, filter); |
| 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, filter); |
| 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, "[kernel.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, |
| symbol_filter_t filter) |
| { |
| int err; |
| const char *kallsyms_filename = NULL; |
| struct machine *machine; |
| char path[PATH_MAX]; |
| |
| if (!map->groups) { |
| pr_debug("Guest kernel map hasn't the point to groups\n"); |
| return -1; |
| } |
| machine = map->groups->machine; |
| |
| 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, filter); |
| 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, filter); |
| 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; |
| machine__mmap_name(machine, path, sizeof(path)); |
| dso__set_long_name(dso, strdup(path), true); |
| 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" |
| }; |
| |
| 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 bool symbol__read_kptr_restrict(void) |
| { |
| bool value = false; |
| |
| if (geteuid() != 0) { |
| FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); |
| if (fp != NULL) { |
| char line[8]; |
| |
| if (fgets(line, sizeof(line), fp) != NULL) |
| value = atoi(line) != 0; |
| |
| fclose(fp); |
| } |
| } |
| |
| return value; |
| } |
| |
| 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.sort_by_name) |
| symbol_conf.priv_size += (sizeof(struct symbol_name_rb_node) - |
| sizeof(struct symbol)); |
| |
| 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; |
| |
| /* |
| * 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_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.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); |
| vmlinux_path__exit(); |
| symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; |
| symbol_conf.initialized = false; |
| } |