diff options
Diffstat (limited to 'kernel/tools/perf/util/map.c')
| -rw-r--r-- | kernel/tools/perf/util/map.c | 800 |
1 files changed, 800 insertions, 0 deletions
diff --git a/kernel/tools/perf/util/map.c b/kernel/tools/perf/util/map.c new file mode 100644 index 000000000..a14f08f41 --- /dev/null +++ b/kernel/tools/perf/util/map.c @@ -0,0 +1,800 @@ +#include "symbol.h" +#include <errno.h> +#include <inttypes.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include "map.h" +#include "thread.h" +#include "strlist.h" +#include "vdso.h" +#include "build-id.h" +#include "util.h" +#include "debug.h" +#include "machine.h" +#include <linux/string.h> + +const char *map_type__name[MAP__NR_TYPES] = { + [MAP__FUNCTION] = "Functions", + [MAP__VARIABLE] = "Variables", +}; + +static inline int is_anon_memory(const char *filename) +{ + return !strcmp(filename, "//anon") || + !strcmp(filename, "/dev/zero (deleted)") || + !strcmp(filename, "/anon_hugepage (deleted)"); +} + +static inline int is_no_dso_memory(const char *filename) +{ + return !strncmp(filename, "[stack", 6) || + !strncmp(filename, "/SYSV",5) || + !strcmp(filename, "[heap]"); +} + +static inline int is_android_lib(const char *filename) +{ + return !strncmp(filename, "/data/app-lib", 13) || + !strncmp(filename, "/system/lib", 11); +} + +static inline bool replace_android_lib(const char *filename, char *newfilename) +{ + const char *libname; + char *app_abi; + size_t app_abi_length, new_length; + size_t lib_length = 0; + + libname = strrchr(filename, '/'); + if (libname) + lib_length = strlen(libname); + + app_abi = getenv("APP_ABI"); + if (!app_abi) + return false; + + app_abi_length = strlen(app_abi); + + if (!strncmp(filename, "/data/app-lib", 13)) { + char *apk_path; + + if (!app_abi_length) + return false; + + new_length = 7 + app_abi_length + lib_length; + + apk_path = getenv("APK_PATH"); + if (apk_path) { + new_length += strlen(apk_path) + 1; + if (new_length > PATH_MAX) + return false; + snprintf(newfilename, new_length, + "%s/libs/%s/%s", apk_path, app_abi, libname); + } else { + if (new_length > PATH_MAX) + return false; + snprintf(newfilename, new_length, + "libs/%s/%s", app_abi, libname); + } + return true; + } + + if (!strncmp(filename, "/system/lib/", 11)) { + char *ndk, *app; + const char *arch; + size_t ndk_length; + size_t app_length; + + ndk = getenv("NDK_ROOT"); + app = getenv("APP_PLATFORM"); + + if (!(ndk && app)) + return false; + + ndk_length = strlen(ndk); + app_length = strlen(app); + + if (!(ndk_length && app_length && app_abi_length)) + return false; + + arch = !strncmp(app_abi, "arm", 3) ? "arm" : + !strncmp(app_abi, "mips", 4) ? "mips" : + !strncmp(app_abi, "x86", 3) ? "x86" : NULL; + + if (!arch) + return false; + + new_length = 27 + ndk_length + + app_length + lib_length + + strlen(arch); + + if (new_length > PATH_MAX) + return false; + snprintf(newfilename, new_length, + "%s/platforms/%s/arch-%s/usr/lib/%s", + ndk, app, arch, libname); + + return true; + } + return false; +} + +void map__init(struct map *map, enum map_type type, + u64 start, u64 end, u64 pgoff, struct dso *dso) +{ + map->type = type; + map->start = start; + map->end = end; + map->pgoff = pgoff; + map->reloc = 0; + map->dso = dso; + map->map_ip = map__map_ip; + map->unmap_ip = map__unmap_ip; + RB_CLEAR_NODE(&map->rb_node); + map->groups = NULL; + map->referenced = false; + map->erange_warned = false; +} + +struct map *map__new(struct machine *machine, u64 start, u64 len, + u64 pgoff, u32 pid, u32 d_maj, u32 d_min, u64 ino, + u64 ino_gen, u32 prot, u32 flags, char *filename, + enum map_type type, struct thread *thread) +{ + struct map *map = malloc(sizeof(*map)); + + if (map != NULL) { + char newfilename[PATH_MAX]; + struct dso *dso; + int anon, no_dso, vdso, android; + + android = is_android_lib(filename); + anon = is_anon_memory(filename); + vdso = is_vdso_map(filename); + no_dso = is_no_dso_memory(filename); + + map->maj = d_maj; + map->min = d_min; + map->ino = ino; + map->ino_generation = ino_gen; + map->prot = prot; + map->flags = flags; + + if ((anon || no_dso) && type == MAP__FUNCTION) { + snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid); + filename = newfilename; + } + + if (android) { + if (replace_android_lib(filename, newfilename)) + filename = newfilename; + } + + if (vdso) { + pgoff = 0; + dso = vdso__dso_findnew(machine, thread); + } else + dso = __dsos__findnew(&machine->user_dsos, filename); + + if (dso == NULL) + goto out_delete; + + map__init(map, type, start, start + len, pgoff, dso); + + if (anon || no_dso) { + map->map_ip = map->unmap_ip = identity__map_ip; + + /* + * Set memory without DSO as loaded. All map__find_* + * functions still return NULL, and we avoid the + * unnecessary map__load warning. + */ + if (type != MAP__FUNCTION) + dso__set_loaded(dso, map->type); + } + } + return map; +out_delete: + free(map); + return NULL; +} + +/* + * Constructor variant for modules (where we know from /proc/modules where + * they are loaded) and for vmlinux, where only after we load all the + * symbols we'll know where it starts and ends. + */ +struct map *map__new2(u64 start, struct dso *dso, enum map_type type) +{ + struct map *map = calloc(1, (sizeof(*map) + + (dso->kernel ? sizeof(struct kmap) : 0))); + if (map != NULL) { + /* + * ->end will be filled after we load all the symbols + */ + map__init(map, type, start, 0, 0, dso); + } + + return map; +} + +void map__delete(struct map *map) +{ + free(map); +} + +void map__fixup_start(struct map *map) +{ + struct rb_root *symbols = &map->dso->symbols[map->type]; + struct rb_node *nd = rb_first(symbols); + if (nd != NULL) { + struct symbol *sym = rb_entry(nd, struct symbol, rb_node); + map->start = sym->start; + } +} + +void map__fixup_end(struct map *map) +{ + struct rb_root *symbols = &map->dso->symbols[map->type]; + struct rb_node *nd = rb_last(symbols); + if (nd != NULL) { + struct symbol *sym = rb_entry(nd, struct symbol, rb_node); + map->end = sym->end; + } +} + +#define DSO__DELETED "(deleted)" + +int map__load(struct map *map, symbol_filter_t filter) +{ + const char *name = map->dso->long_name; + int nr; + + if (dso__loaded(map->dso, map->type)) + return 0; + + nr = dso__load(map->dso, map, filter); + if (nr < 0) { + if (map->dso->has_build_id) { + char sbuild_id[BUILD_ID_SIZE * 2 + 1]; + + build_id__sprintf(map->dso->build_id, + sizeof(map->dso->build_id), + sbuild_id); + pr_warning("%s with build id %s not found", + name, sbuild_id); + } else + pr_warning("Failed to open %s", name); + + pr_warning(", continuing without symbols\n"); + return -1; + } else if (nr == 0) { +#ifdef HAVE_LIBELF_SUPPORT + const size_t len = strlen(name); + const size_t real_len = len - sizeof(DSO__DELETED); + + if (len > sizeof(DSO__DELETED) && + strcmp(name + real_len + 1, DSO__DELETED) == 0) { + pr_warning("%.*s was updated (is prelink enabled?). " + "Restart the long running apps that use it!\n", + (int)real_len, name); + } else { + pr_warning("no symbols found in %s, maybe install " + "a debug package?\n", name); + } +#endif + return -1; + } + + return 0; +} + +struct symbol *map__find_symbol(struct map *map, u64 addr, + symbol_filter_t filter) +{ + if (map__load(map, filter) < 0) + return NULL; + + return dso__find_symbol(map->dso, map->type, addr); +} + +struct symbol *map__find_symbol_by_name(struct map *map, const char *name, + symbol_filter_t filter) +{ + if (map__load(map, filter) < 0) + return NULL; + + if (!dso__sorted_by_name(map->dso, map->type)) + dso__sort_by_name(map->dso, map->type); + + return dso__find_symbol_by_name(map->dso, map->type, name); +} + +struct map *map__clone(struct map *map) +{ + return memdup(map, sizeof(*map)); +} + +int map__overlap(struct map *l, struct map *r) +{ + if (l->start > r->start) { + struct map *t = l; + l = r; + r = t; + } + + if (l->end > r->start) + return 1; + + return 0; +} + +size_t map__fprintf(struct map *map, FILE *fp) +{ + return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n", + map->start, map->end, map->pgoff, map->dso->name); +} + +size_t map__fprintf_dsoname(struct map *map, FILE *fp) +{ + const char *dsoname = "[unknown]"; + + if (map && map->dso && (map->dso->name || map->dso->long_name)) { + if (symbol_conf.show_kernel_path && map->dso->long_name) + dsoname = map->dso->long_name; + else if (map->dso->name) + dsoname = map->dso->name; + } + + return fprintf(fp, "%s", dsoname); +} + +int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix, + FILE *fp) +{ + char *srcline; + int ret = 0; + + if (map && map->dso) { + srcline = get_srcline(map->dso, + map__rip_2objdump(map, addr), NULL, true); + if (srcline != SRCLINE_UNKNOWN) + ret = fprintf(fp, "%s%s", prefix, srcline); + free_srcline(srcline); + } + return ret; +} + +/** + * map__rip_2objdump - convert symbol start address to objdump address. + * @map: memory map + * @rip: symbol start address + * + * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN. + * map->dso->adjust_symbols==1 for ET_EXEC-like cases except ET_REL which is + * relative to section start. + * + * Return: Address suitable for passing to "objdump --start-address=" + */ +u64 map__rip_2objdump(struct map *map, u64 rip) +{ + if (!map->dso->adjust_symbols) + return rip; + + if (map->dso->rel) + return rip - map->pgoff; + + return map->unmap_ip(map, rip) - map->reloc; +} + +/** + * map__objdump_2mem - convert objdump address to a memory address. + * @map: memory map + * @ip: objdump address + * + * Closely related to map__rip_2objdump(), this function takes an address from + * objdump and converts it to a memory address. Note this assumes that @map + * contains the address. To be sure the result is valid, check it forwards + * e.g. map__rip_2objdump(map->map_ip(map, map__objdump_2mem(map, ip))) == ip + * + * Return: Memory address. + */ +u64 map__objdump_2mem(struct map *map, u64 ip) +{ + if (!map->dso->adjust_symbols) + return map->unmap_ip(map, ip); + + if (map->dso->rel) + return map->unmap_ip(map, ip + map->pgoff); + + return ip + map->reloc; +} + +void map_groups__init(struct map_groups *mg, struct machine *machine) +{ + int i; + for (i = 0; i < MAP__NR_TYPES; ++i) { + mg->maps[i] = RB_ROOT; + INIT_LIST_HEAD(&mg->removed_maps[i]); + } + mg->machine = machine; + mg->refcnt = 1; +} + +static void maps__delete(struct rb_root *maps) +{ + struct rb_node *next = rb_first(maps); + + while (next) { + struct map *pos = rb_entry(next, struct map, rb_node); + + next = rb_next(&pos->rb_node); + rb_erase(&pos->rb_node, maps); + map__delete(pos); + } +} + +static void maps__delete_removed(struct list_head *maps) +{ + struct map *pos, *n; + + list_for_each_entry_safe(pos, n, maps, node) { + list_del(&pos->node); + map__delete(pos); + } +} + +void map_groups__exit(struct map_groups *mg) +{ + int i; + + for (i = 0; i < MAP__NR_TYPES; ++i) { + maps__delete(&mg->maps[i]); + maps__delete_removed(&mg->removed_maps[i]); + } +} + +bool map_groups__empty(struct map_groups *mg) +{ + int i; + + for (i = 0; i < MAP__NR_TYPES; ++i) { + if (maps__first(&mg->maps[i])) + return false; + if (!list_empty(&mg->removed_maps[i])) + return false; + } + + return true; +} + +struct map_groups *map_groups__new(struct machine *machine) +{ + struct map_groups *mg = malloc(sizeof(*mg)); + + if (mg != NULL) + map_groups__init(mg, machine); + + return mg; +} + +void map_groups__delete(struct map_groups *mg) +{ + map_groups__exit(mg); + free(mg); +} + +void map_groups__put(struct map_groups *mg) +{ + if (--mg->refcnt == 0) + map_groups__delete(mg); +} + +void map_groups__flush(struct map_groups *mg) +{ + int type; + + for (type = 0; type < MAP__NR_TYPES; type++) { + struct rb_root *root = &mg->maps[type]; + struct rb_node *next = rb_first(root); + + while (next) { + struct map *pos = rb_entry(next, struct map, rb_node); + next = rb_next(&pos->rb_node); + rb_erase(&pos->rb_node, root); + /* + * We may have references to this map, for + * instance in some hist_entry instances, so + * just move them to a separate list. + */ + list_add_tail(&pos->node, &mg->removed_maps[pos->type]); + } + } +} + +struct symbol *map_groups__find_symbol(struct map_groups *mg, + enum map_type type, u64 addr, + struct map **mapp, + symbol_filter_t filter) +{ + struct map *map = map_groups__find(mg, type, addr); + + /* Ensure map is loaded before using map->map_ip */ + if (map != NULL && map__load(map, filter) >= 0) { + if (mapp != NULL) + *mapp = map; + return map__find_symbol(map, map->map_ip(map, addr), filter); + } + + return NULL; +} + +struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg, + enum map_type type, + const char *name, + struct map **mapp, + symbol_filter_t filter) +{ + struct rb_node *nd; + + for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) { + struct map *pos = rb_entry(nd, struct map, rb_node); + struct symbol *sym = map__find_symbol_by_name(pos, name, filter); + + if (sym == NULL) + continue; + if (mapp != NULL) + *mapp = pos; + return sym; + } + + return NULL; +} + +int map_groups__find_ams(struct addr_map_symbol *ams, symbol_filter_t filter) +{ + if (ams->addr < ams->map->start || ams->addr >= ams->map->end) { + if (ams->map->groups == NULL) + return -1; + ams->map = map_groups__find(ams->map->groups, ams->map->type, + ams->addr); + if (ams->map == NULL) + return -1; + } + + ams->al_addr = ams->map->map_ip(ams->map, ams->addr); + ams->sym = map__find_symbol(ams->map, ams->al_addr, filter); + + return ams->sym ? 0 : -1; +} + +size_t __map_groups__fprintf_maps(struct map_groups *mg, enum map_type type, + FILE *fp) +{ + size_t printed = fprintf(fp, "%s:\n", map_type__name[type]); + struct rb_node *nd; + + for (nd = rb_first(&mg->maps[type]); nd; nd = rb_next(nd)) { + struct map *pos = rb_entry(nd, struct map, rb_node); + printed += fprintf(fp, "Map:"); + printed += map__fprintf(pos, fp); + if (verbose > 2) { + printed += dso__fprintf(pos->dso, type, fp); + printed += fprintf(fp, "--\n"); + } + } + + return printed; +} + +static size_t map_groups__fprintf_maps(struct map_groups *mg, FILE *fp) +{ + size_t printed = 0, i; + for (i = 0; i < MAP__NR_TYPES; ++i) + printed += __map_groups__fprintf_maps(mg, i, fp); + return printed; +} + +static size_t __map_groups__fprintf_removed_maps(struct map_groups *mg, + enum map_type type, FILE *fp) +{ + struct map *pos; + size_t printed = 0; + + list_for_each_entry(pos, &mg->removed_maps[type], node) { + printed += fprintf(fp, "Map:"); + printed += map__fprintf(pos, fp); + if (verbose > 1) { + printed += dso__fprintf(pos->dso, type, fp); + printed += fprintf(fp, "--\n"); + } + } + return printed; +} + +static size_t map_groups__fprintf_removed_maps(struct map_groups *mg, + FILE *fp) +{ + size_t printed = 0, i; + for (i = 0; i < MAP__NR_TYPES; ++i) + printed += __map_groups__fprintf_removed_maps(mg, i, fp); + return printed; +} + +size_t map_groups__fprintf(struct map_groups *mg, FILE *fp) +{ + size_t printed = map_groups__fprintf_maps(mg, fp); + printed += fprintf(fp, "Removed maps:\n"); + return printed + map_groups__fprintf_removed_maps(mg, fp); +} + +int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map, + FILE *fp) +{ + struct rb_root *root = &mg->maps[map->type]; + struct rb_node *next = rb_first(root); + int err = 0; + + while (next) { + struct map *pos = rb_entry(next, struct map, rb_node); + next = rb_next(&pos->rb_node); + + if (!map__overlap(pos, map)) + continue; + + if (verbose >= 2) { + fputs("overlapping maps:\n", fp); + map__fprintf(map, fp); + map__fprintf(pos, fp); + } + + rb_erase(&pos->rb_node, root); + /* + * Now check if we need to create new maps for areas not + * overlapped by the new map: + */ + if (map->start > pos->start) { + struct map *before = map__clone(pos); + + if (before == NULL) { + err = -ENOMEM; + goto move_map; + } + + before->end = map->start; + map_groups__insert(mg, before); + if (verbose >= 2) + map__fprintf(before, fp); + } + + if (map->end < pos->end) { + struct map *after = map__clone(pos); + + if (after == NULL) { + err = -ENOMEM; + goto move_map; + } + + after->start = map->end; + map_groups__insert(mg, after); + if (verbose >= 2) + map__fprintf(after, fp); + } +move_map: + /* + * If we have references, just move them to a separate list. + */ + if (pos->referenced) + list_add_tail(&pos->node, &mg->removed_maps[map->type]); + else + map__delete(pos); + + if (err) + return err; + } + + return 0; +} + +/* + * XXX This should not really _copy_ te maps, but refcount them. + */ +int map_groups__clone(struct map_groups *mg, + struct map_groups *parent, enum map_type type) +{ + struct rb_node *nd; + for (nd = rb_first(&parent->maps[type]); nd; nd = rb_next(nd)) { + struct map *map = rb_entry(nd, struct map, rb_node); + struct map *new = map__clone(map); + if (new == NULL) + return -ENOMEM; + map_groups__insert(mg, new); + } + return 0; +} + +void maps__insert(struct rb_root *maps, struct map *map) +{ + struct rb_node **p = &maps->rb_node; + struct rb_node *parent = NULL; + const u64 ip = map->start; + struct map *m; + + while (*p != NULL) { + parent = *p; + m = rb_entry(parent, struct map, rb_node); + if (ip < m->start) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + } + + rb_link_node(&map->rb_node, parent, p); + rb_insert_color(&map->rb_node, maps); +} + +void maps__remove(struct rb_root *maps, struct map *map) +{ + rb_erase(&map->rb_node, maps); +} + +struct map *maps__find(struct rb_root *maps, u64 ip) +{ + struct rb_node **p = &maps->rb_node; + struct rb_node *parent = NULL; + struct map *m; + + while (*p != NULL) { + parent = *p; + m = rb_entry(parent, struct map, rb_node); + if (ip < m->start) + p = &(*p)->rb_left; + else if (ip >= m->end) + p = &(*p)->rb_right; + else + return m; + } + + return NULL; +} + +struct map *maps__first(struct rb_root *maps) +{ + struct rb_node *first = rb_first(maps); + + if (first) + return rb_entry(first, struct map, rb_node); + return NULL; +} + +struct map *maps__next(struct map *map) +{ + struct rb_node *next = rb_next(&map->rb_node); + + if (next) + return rb_entry(next, struct map, rb_node); + return NULL; +} + +struct kmap *map__kmap(struct map *map) +{ + if (!map->dso || !map->dso->kernel) { + pr_err("Internal error: map__kmap with a non-kernel map\n"); + return NULL; + } + return (struct kmap *)(map + 1); +} + +struct map_groups *map__kmaps(struct map *map) +{ + struct kmap *kmap = map__kmap(map); + + if (!kmap || !kmap->kmaps) { + pr_err("Internal error: map__kmaps with a non-kernel map\n"); + return NULL; + } + return kmap->kmaps; +} |