diff options
Diffstat (limited to 'src/tools/perf/util/symbol.c')
| -rw-r--r-- | src/tools/perf/util/symbol.c | 1509 |
1 files changed, 0 insertions, 1509 deletions
diff --git a/src/tools/perf/util/symbol.c b/src/tools/perf/util/symbol.c deleted file mode 100644 index 7eb0362..0000000 --- a/src/tools/perf/util/symbol.c +++ /dev/null @@ -1,1509 +0,0 @@ -#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 <elf.h> -#include <limits.h> -#include <sys/utsname.h> - -#ifndef KSYM_NAME_LEN -#define KSYM_NAME_LEN 256 -#endif - -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, - .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__SYSTEM_PATH_KMODULE, - 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; -} - -#define SYMBOL_A 0 -#define SYMBOL_B 1 - -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; - - /* Avoid "SyS" kernel syscall aliases */ - if (na >= 3 && !strncmp(syma->name, "SyS", 3)) - return SYMBOL_B; - if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10)) - return SYMBOL_B; - - return SYMBOL_A; -} - -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); - goto again; - } else { - nd = rb_next(&curr->rb_node); - rb_erase(&curr->rb_node, symbols); - } - } -} - -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 - 1; - } - - /* 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 map *prev, *curr; - struct rb_node *nd, *prevnd = rb_first(&mg->maps[type]); - - if (prevnd == NULL) - return; - - curr = rb_entry(prevnd, struct map, rb_node); - - for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) { - prev = curr; - curr = rb_entry(nd, struct map, rb_node); - prev->end = curr->start - 1; - } - - /* - * We still haven't the actual symbols, so guess the - * last map final address. - */ - curr->end = ~0ULL; -} - -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 - 1 : 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; -} - -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; - - if (symbols == NULL) - return NULL; - - n = symbols->rb_node; - - while (n) { - struct symbol_name_rb_node *s; - int cmp; - - s = rb_entry(n, struct symbol_name_rb_node, rb_node); - cmp = strcmp(name, s->sym.name); - - if (cmp < 0) - n = n->rb_left; - else if (cmp > 0) - n = n->rb_right; - else - return &s->sym; - } - - return NULL; -} - -struct symbol *dso__find_symbol(struct dso *dso, - enum map_type type, u64 addr) -{ - return symbols__find(&dso->symbols[type], addr); -} - -struct symbol *dso__first_symbol(struct dso *dso, enum map_type type) -{ - return symbols__first(&dso->symbols[type]); -} - -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 kallsyms__parse(const char *filename, void *arg, - int (*process_symbol)(void *arg, const char *name, - char type, u64 start)) -{ - char *line = NULL; - size_t n; - int err = -1; - FILE *file = fopen(filename, "r"); - - if (file == NULL) - goto out_failure; - - err = 0; - - while (!feof(file)) { - u64 start; - int line_len, len; - char symbol_type; - char *symbol_name; - - line_len = getline(&line, &n, file); - if (line_len < 0 || !line) - break; - - line[--line_len] = '\0'; /* \n */ - - len = hex2u64(line, &start); - - len++; - if (len + 2 >= line_len) - continue; - - symbol_type = line[len]; - len += 2; - symbol_name = line + len; - len = line_len - len; - - if (len >= KSYM_NAME_LEN) { - err = -1; - break; - } - - err = process_symbol(arg, symbol_name, - symbol_type, start); - if (err) - break; - } - - free(line); - fclose(file); - return err; - -out_failure: - return -1; -} - -struct process_kallsyms_args { - struct map *map; - struct dso *dso; -}; - -static u8 kallsyms2elf_type(char type) -{ - if (type == 'W') - return STB_WEAK; - - return isupper(type) ? STB_GLOBAL : STB_LOCAL; -} - -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_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); - - 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__kmap(map)->kmaps; - struct map *curr_map; - struct symbol *pos; - int count = 0, moved = 0; - struct rb_root *root = &dso->symbols[map->type]; - struct rb_node *next = rb_first(root); - - 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) - *module = '\0'; - - curr_map = map_groups__find(kmaps, map->type, pos->start); - - if (!curr_map || (filter && filter(curr_map, pos))) { - rb_erase(&pos->rb_node, root); - symbol__delete(pos); - } else { - pos->start -= curr_map->start - curr_map->pgoff; - if (pos->end) - pos->end -= curr_map->start - curr_map->pgoff; - if (curr_map != map) { - rb_erase(&pos->rb_node, root); - symbols__insert( - &curr_map->dso->symbols[curr_map->type], - pos); - ++moved; - } else { - ++count; - } - } - } - - /* Symbols have been adjusted */ - dso->adjust_symbols = 1; - - return count + moved; -} - -/* - * 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, - symbol_filter_t filter) -{ - struct map_groups *kmaps = map__kmap(map)->kmaps; - struct machine *machine = kmaps->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; - - 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 (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__delete(ndso); - return -1; - } - - curr_map->map_ip = curr_map->unmap_ip = identity__map_ip; - map_groups__insert(kmaps, curr_map); - ++kernel_range; - } -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 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; -} - -/* - * If kallsyms is referenced by name then we look for kcore in the same - * directory. - */ -static bool kcore_filename_from_kallsyms_filename(char *kcore_filename, - const char *kallsyms_filename) -{ - char *name; - - strcpy(kcore_filename, kallsyms_filename); - name = strrchr(kcore_filename, '/'); - if (!name) - return false; - - if (!strcmp(name, "/kallsyms")) { - strcpy(name, "/kcore"); - return true; - } - - return false; -} - -static int dso__load_kcore(struct dso *dso, struct map *map, - const char *kallsyms_filename) -{ - struct map_groups *kmaps = map__kmap(map)->kmaps; - struct machine *machine = kmaps->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; - - /* This function requires that the map is the kernel map */ - if (map != machine->vmlinux_maps[map->type]) - return -EINVAL; - - if (!kcore_filename_from_kallsyms_filename(kcore_filename, - kallsyms_filename)) - return -EINVAL; - - md.dso = dso; - md.type = map->type; - INIT_LIST_HEAD(&md.maps); - - fd = open(kcore_filename, O_RDONLY); - if (fd < 0) - 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; - - 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(&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; - map__delete(new_map); - /* Ensure maps are correctly ordered */ - map_groups__remove(kmaps, map); - map_groups__insert(kmaps, map); - } else { - map_groups__insert(kmaps, 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->data_type = DSO_BINARY_TYPE__GUEST_KCORE; - else - dso->data_type = DSO_BINARY_TYPE__KCORE; - dso__set_long_name(dso, strdup(kcore_filename)); - - 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(&map->node); - map__delete(map); - } - close(fd); - return -EINVAL; -} - -int dso__load_kallsyms(struct dso *dso, const char *filename, - struct map *map, symbol_filter_t filter) -{ - if (symbol__restricted_filename(filename, "/proc/kallsyms")) - return -1; - - if (dso__load_all_kallsyms(dso, filename, map) < 0) - 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, 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; -} - -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; - - dso__set_loaded(dso, map->type); - - if (dso->kernel == DSO_TYPE_KERNEL) - return dso__load_kernel_sym(dso, map, filter); - else if (dso->kernel == DSO_TYPE_GUEST_KERNEL) - return dso__load_guest_kernel_sym(dso, map, filter); - - 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) - return -1; - - if (st.st_uid && (st.st_uid != geteuid())) { - pr_warning("File %s not owned by current user or root, " - "ignoring it.\n", dso->name); - return -1; - } - - ret = dso__load_perf_map(dso, map, filter); - dso->symtab_type = ret > 0 ? DSO_BINARY_TYPE__JAVA_JIT : - DSO_BINARY_TYPE__NOT_FOUND; - return ret; - } - - if (machine) - root_dir = machine->root_dir; - - name = malloc(PATH_MAX); - if (!name) - return -1; - - /* 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__binary_type_file(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 (!runtime_ss && symsrc__possibly_runtime(ss)) { - runtime_ss = ss; - next_slot = true; - } - - if (next_slot) { - ss_pos++; - - if (syms_ss && runtime_ss) - break; - } - - } - - 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) { - int km; - - km = dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || - dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE; - ret = dso__load_sym(dso, map, syms_ss, runtime_ss, filter, km); - } 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) - return 0; - return ret; -} - -struct map *map_groups__find_by_name(struct map_groups *mg, - enum map_type type, const char *name) -{ - struct rb_node *nd; - - for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) { - struct map *map = rb_entry(nd, struct map, rb_node); - - if (map->dso && strcmp(map->dso->short_name, name) == 0) - return map; - } - - return NULL; -} - -int dso__load_vmlinux(struct dso *dso, struct map *map, - const char *vmlinux, 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 - snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s%s", - symbol_conf.symfs, 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->data_type = DSO_BINARY_TYPE__GUEST_VMLINUX; - else - dso->data_type = DSO_BINARY_TYPE__VMLINUX; - dso__set_long_name(dso, (char *)vmlinux); - 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; - - pr_debug("Looking at the vmlinux_path (%d entries long)\n", - vmlinux_path__nr_entries + 1); - - filename = dso__build_id_filename(dso, NULL, 0); - if (filename != NULL) { - err = dso__load_vmlinux(dso, map, filename, filter); - if (err > 0) { - dso->lname_alloc = 1; - goto out; - } - free(filename); - } - - for (i = 0; i < vmlinux_path__nr_entries; ++i) { - err = dso__load_vmlinux(dso, map, vmlinux_path[i], filter); - if (err > 0) { - dso__set_long_name(dso, strdup(vmlinux_path[i])); - dso->lname_alloc = 1; - break; - } - } -out: - return err; -} - -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.vmlinux_name != NULL) { - err = dso__load_vmlinux(dso, map, - symbol_conf.vmlinux_name, filter); - if (err > 0) { - dso__set_long_name(dso, - strdup(symbol_conf.vmlinux_name)); - dso->lname_alloc = 1; - return err; - } - return err; - } - - if (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; - - /* - * Say the kernel DSO was created when processing the build-id header table, - * we have a build-id, so check if it is the same as the running kernel, - * using it if it is. - */ - if (dso->has_build_id) { - u8 kallsyms_build_id[BUILD_ID_SIZE]; - char sbuild_id[BUILD_ID_SIZE * 2 + 1]; - - if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id, - sizeof(kallsyms_build_id)) == 0) { - if (dso__build_id_equal(dso, kallsyms_build_id)) { - kallsyms_filename = "/proc/kallsyms"; - goto do_kallsyms; - } - } - /* - * Now look if we have it on the build-id cache in - * $HOME/.debug/[kernel.kallsyms]. - */ - build_id__sprintf(dso->build_id, sizeof(dso->build_id), - sbuild_id); - - if (asprintf(&kallsyms_allocated_filename, - "%s/.debug/[kernel.kallsyms]/%s", - getenv("HOME"), sbuild_id) == -1) { - pr_err("Not enough memory for kallsyms file lookup\n"); - return -1; - } - - kallsyms_filename = kallsyms_allocated_filename; - - if (access(kallsyms_filename, F_OK)) { - pr_err("No kallsyms or vmlinux with build-id %s " - "was found\n", sbuild_id); - free(kallsyms_allocated_filename); - return -1; - } - } else { - /* - * Last resort, if we don't have a build-id and couldn't find - * any vmlinux file, try the running kernel kallsyms table. - */ - kallsyms_filename = "/proc/kallsyms"; - } - -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__set_long_name(dso, strdup("[kernel.kallsyms]")); - 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, 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)) { - machine__mmap_name(machine, path, sizeof(path)); - dso__set_long_name(dso, strdup(path)); - map__fixup_start(map); - map__fixup_end(map); - } - - return err; -} - -static void vmlinux_path__exit(void) -{ - while (--vmlinux_path__nr_entries >= 0) { - free(vmlinux_path[vmlinux_path__nr_entries]); - vmlinux_path[vmlinux_path__nr_entries] = NULL; - } - - free(vmlinux_path); - vmlinux_path = NULL; -} - -static int vmlinux_path__init(void) -{ - struct utsname uts; - char bf[PATH_MAX]; - - vmlinux_path = malloc(sizeof(char *) * 5); - if (vmlinux_path == NULL) - return -1; - - vmlinux_path[vmlinux_path__nr_entries] = strdup("vmlinux"); - if (vmlinux_path[vmlinux_path__nr_entries] == NULL) - goto out_fail; - ++vmlinux_path__nr_entries; - vmlinux_path[vmlinux_path__nr_entries] = strdup("/boot/vmlinux"); - if (vmlinux_path[vmlinux_path__nr_entries] == NULL) - goto out_fail; - ++vmlinux_path__nr_entries; - - /* only try running kernel version if no symfs was given */ - if (symbol_conf.symfs[0] != 0) - return 0; - - if (uname(&uts) < 0) - return -1; - - snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release); - vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); - if (vmlinux_path[vmlinux_path__nr_entries] == NULL) - goto out_fail; - ++vmlinux_path__nr_entries; - snprintf(bf, sizeof(bf), "/lib/modules/%s/build/vmlinux", uts.release); - vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); - if (vmlinux_path[vmlinux_path__nr_entries] == NULL) - goto out_fail; - ++vmlinux_path__nr_entries; - snprintf(bf, sizeof(bf), "/usr/lib/debug/lib/modules/%s/vmlinux", - uts.release); - vmlinux_path[vmlinux_path__nr_entries] = strdup(bf); - if (vmlinux_path[vmlinux_path__nr_entries] == NULL) - goto out_fail; - ++vmlinux_path__nr_entries; - - return 0; - -out_fail: - vmlinux_path__exit(); - return -1; -} - -static int setup_list(struct strlist **list, const char *list_str, - const char *list_name) -{ - if (list_str == NULL) - return 0; - - *list = strlist__new(true, 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(void) -{ - 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() < 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_list(&symbol_conf.sym_list, - symbol_conf.sym_list_str, "symbol") < 0) - goto out_free_comm_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_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); - vmlinux_path__exit(); - symbol_conf.sym_list = symbol_conf.dso_list = symbol_conf.comm_list = NULL; - symbol_conf.initialized = false; -} |