diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/util/map.c | 920 |
1 files changed, 920 insertions, 0 deletions
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c new file mode 100644 index 000000000..769d11575 --- /dev/null +++ b/tools/perf/util/map.c @@ -0,0 +1,920 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "symbol.h" +#include <assert.h> +#include <errno.h> +#include <inttypes.h> +#include <limits.h> +#include <stdlib.h> +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */ +#include "map.h" +#include "thread.h" +#include "vdso.h" +#include "build-id.h" +#include "util.h" +#include "debug.h" +#include "machine.h" +#include <linux/string.h> +#include "srcline.h" +#include "namespaces.h" +#include "unwind.h" + +static void __maps__insert(struct maps *maps, struct map *map); + +static inline int is_anon_memory(const char *filename, u32 flags) +{ + return flags & MAP_HUGETLB || + !strcmp(filename, "//anon") || + !strncmp(filename, "/dev/zero", sizeof("/dev/zero") - 1) || + !strncmp(filename, "/anon_hugepage", sizeof("/anon_hugepage") - 1); +} + +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/", 12)) { + char *ndk, *app; + const char *arch; + int ndk_length, 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_length, ndk, app_length, app, arch, libname); + + return true; + } + return false; +} + +void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso) +{ + map->start = start; + map->end = end; + map->pgoff = pgoff; + map->reloc = 0; + map->dso = dso__get(dso); + map->map_ip = map__map_ip; + map->unmap_ip = map__unmap_ip; + RB_CLEAR_NODE(&map->rb_node); + map->groups = NULL; + map->erange_warned = false; + refcount_set(&map->refcnt, 1); +} + +struct map *map__new(struct machine *machine, u64 start, u64 len, + u64 pgoff, u32 d_maj, u32 d_min, u64 ino, + u64 ino_gen, u32 prot, u32 flags, char *filename, + struct thread *thread) +{ + struct map *map = malloc(sizeof(*map)); + struct nsinfo *nsi = NULL; + struct nsinfo *nnsi; + + 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, flags); + 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; + nsi = nsinfo__get(thread->nsinfo); + + if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) { + snprintf(newfilename, sizeof(newfilename), + "/tmp/perf-%d.map", nsi->pid); + filename = newfilename; + } + + if (android) { + if (replace_android_lib(filename, newfilename)) + filename = newfilename; + } + + if (vdso) { + /* The vdso maps are always on the host and not the + * container. Ensure that we don't use setns to look + * them up. + */ + nnsi = nsinfo__copy(nsi); + if (nnsi) { + nsinfo__put(nsi); + nnsi->need_setns = false; + nsi = nnsi; + } + pgoff = 0; + dso = machine__findnew_vdso(machine, thread); + } else + dso = machine__findnew_dso(machine, filename); + + if (dso == NULL) + goto out_delete; + + map__init(map, 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 (!(prot & PROT_EXEC)) + dso__set_loaded(dso); + } + dso->nsinfo = nsi; + dso__put(dso); + } + return map; +out_delete: + nsinfo__put(nsi); + 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) +{ + 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, start, 0, 0, dso); + } + + return map; +} + +/* + * Use this and __map__is_kmodule() for map instances that are in + * machine->kmaps, and thus have map->groups->machine all properly set, to + * disambiguate between the kernel and modules. + * + * When the need arises, introduce map__is_{kernel,kmodule)() that + * checks (map->groups != NULL && map->groups->machine != NULL && + * map->dso->kernel) before calling __map__is_{kernel,kmodule}()) + */ +bool __map__is_kernel(const struct map *map) +{ + return machine__kernel_map(map->groups->machine) == map; +} + +bool __map__is_extra_kernel_map(const struct map *map) +{ + struct kmap *kmap = __map__kmap((struct map *)map); + + return kmap && kmap->name[0]; +} + +bool map__has_symbols(const struct map *map) +{ + return dso__has_symbols(map->dso); +} + +static void map__exit(struct map *map) +{ + BUG_ON(!RB_EMPTY_NODE(&map->rb_node)); + dso__zput(map->dso); +} + +void map__delete(struct map *map) +{ + map__exit(map); + free(map); +} + +void map__put(struct map *map) +{ + if (map && refcount_dec_and_test(&map->refcnt)) + map__delete(map); +} + +void map__fixup_start(struct map *map) +{ + struct rb_root *symbols = &map->dso->symbols; + 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; + 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) +{ + const char *name = map->dso->long_name; + int nr; + + if (dso__loaded(map->dso)) + return 0; + + nr = dso__load(map->dso, map); + if (nr < 0) { + if (map->dso->has_build_id) { + char sbuild_id[SBUILD_ID_SIZE]; + + 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) +{ + if (map__load(map) < 0) + return NULL; + + return dso__find_symbol(map->dso, addr); +} + +struct symbol *map__find_symbol_by_name(struct map *map, const char *name) +{ + if (map__load(map) < 0) + return NULL; + + if (!dso__sorted_by_name(map->dso)) + dso__sort_by_name(map->dso); + + return dso__find_symbol_by_name(map->dso, name); +} + +struct map *map__clone(struct map *from) +{ + struct map *map = memdup(from, sizeof(*map)); + + if (map != NULL) { + refcount_set(&map->refcnt, 1); + RB_CLEAR_NODE(&map->rb_node); + dso__get(map->dso); + map->groups = NULL; + } + + return map; +} + +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) { + if (symbol_conf.show_kernel_path && map->dso->long_name) + dsoname = map->dso->long_name; + else + dsoname = map->dso->name; + } + + return fprintf(fp, "%s", dsoname); +} + +char *map__srcline(struct map *map, u64 addr, struct symbol *sym) +{ + if (map == NULL) + return SRCLINE_UNKNOWN; + return get_srcline(map->dso, map__rip_2objdump(map, addr), sym, true, true, addr); +} + +int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix, + FILE *fp) +{ + int ret = 0; + + if (map && map->dso) { + char *srcline = map__srcline(map, addr, NULL); + 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) +{ + struct kmap *kmap = __map__kmap(map); + + /* + * vmlinux does not have program headers for PTI entry trampolines and + * kcore may not either. However the trampoline object code is on the + * main kernel map, so just use that instead. + */ + if (kmap && is_entry_trampoline(kmap->name) && kmap->kmaps && kmap->kmaps->machine) { + struct map *kernel_map = machine__kernel_map(kmap->kmaps->machine); + + if (kernel_map) + map = kernel_map; + } + + if (!map->dso->adjust_symbols) + return rip; + + if (map->dso->rel) + return rip - map->pgoff; + + /* + * kernel modules also have DSO_TYPE_USER in dso->kernel, + * but all kernel modules are ET_REL, so won't get here. + */ + if (map->dso->kernel == DSO_TYPE_USER) + return rip + map->dso->text_offset; + + 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); + + /* + * kernel modules also have DSO_TYPE_USER in dso->kernel, + * but all kernel modules are ET_REL, so won't get here. + */ + if (map->dso->kernel == DSO_TYPE_USER) + return map->unmap_ip(map, ip - map->dso->text_offset); + + return ip + map->reloc; +} + +static void maps__init(struct maps *maps) +{ + maps->entries = RB_ROOT; + init_rwsem(&maps->lock); +} + +void map_groups__init(struct map_groups *mg, struct machine *machine) +{ + maps__init(&mg->maps); + mg->machine = machine; + refcount_set(&mg->refcnt, 1); +} + +static void __maps__purge(struct maps *maps) +{ + struct rb_root *root = &maps->entries; + 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_init(&pos->rb_node, root); + map__put(pos); + } +} + +static void maps__exit(struct maps *maps) +{ + down_write(&maps->lock); + __maps__purge(maps); + up_write(&maps->lock); +} + +void map_groups__exit(struct map_groups *mg) +{ + maps__exit(&mg->maps); +} + +bool map_groups__empty(struct map_groups *mg) +{ + return !maps__first(&mg->maps); +} + +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 && refcount_dec_and_test(&mg->refcnt)) + map_groups__delete(mg); +} + +struct symbol *map_groups__find_symbol(struct map_groups *mg, + u64 addr, struct map **mapp) +{ + struct map *map = map_groups__find(mg, addr); + + /* Ensure map is loaded before using map->map_ip */ + if (map != NULL && map__load(map) >= 0) { + if (mapp != NULL) + *mapp = map; + return map__find_symbol(map, map->map_ip(map, addr)); + } + + return NULL; +} + +static bool map__contains_symbol(struct map *map, struct symbol *sym) +{ + u64 ip = map->unmap_ip(map, sym->start); + + return ip >= map->start && ip < map->end; +} + +struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name, + struct map **mapp) +{ + struct symbol *sym; + struct rb_node *nd; + + down_read(&maps->lock); + + for (nd = rb_first(&maps->entries); nd; nd = rb_next(nd)) { + struct map *pos = rb_entry(nd, struct map, rb_node); + + sym = map__find_symbol_by_name(pos, name); + + if (sym == NULL) + continue; + if (!map__contains_symbol(pos, sym)) { + sym = NULL; + continue; + } + if (mapp != NULL) + *mapp = pos; + goto out; + } + + sym = NULL; +out: + up_read(&maps->lock); + return sym; +} + +struct symbol *map_groups__find_symbol_by_name(struct map_groups *mg, + const char *name, + struct map **mapp) +{ + return maps__find_symbol_by_name(&mg->maps, name, mapp); +} + +int map_groups__find_ams(struct addr_map_symbol *ams) +{ + 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->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); + + return ams->sym ? 0 : -1; +} + +static size_t maps__fprintf(struct maps *maps, FILE *fp) +{ + size_t printed = 0; + struct rb_node *nd; + + down_read(&maps->lock); + + for (nd = rb_first(&maps->entries); 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, fp); + printed += fprintf(fp, "--\n"); + } + } + + up_read(&maps->lock); + + return printed; +} + +size_t map_groups__fprintf(struct map_groups *mg, FILE *fp) +{ + return maps__fprintf(&mg->maps, fp); +} + +static void __map_groups__insert(struct map_groups *mg, struct map *map) +{ + __maps__insert(&mg->maps, map); + map->groups = mg; +} + +static int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp) +{ + struct rb_root *root; + struct rb_node *next, *first; + int err = 0; + + down_write(&maps->lock); + + root = &maps->entries; + + /* + * Find first map where end > map->start. + * Same as find_vma() in kernel. + */ + next = root->rb_node; + first = NULL; + while (next) { + struct map *pos = rb_entry(next, struct map, rb_node); + + if (pos->end > map->start) { + first = next; + if (pos->start <= map->start) + break; + next = next->rb_left; + } else + next = next->rb_right; + } + + next = first; + while (next) { + struct map *pos = rb_entry(next, struct map, rb_node); + next = rb_next(&pos->rb_node); + + /* + * Stop if current map starts after map->end. + * Maps are ordered by start: next will not overlap for sure. + */ + if (pos->start >= map->end) + break; + + if (verbose >= 2) { + + if (use_browser) { + pr_warning("overlapping maps in %s " + "(disable tui for more info)\n", + map->dso->name); + } else { + fputs("overlapping maps:\n", fp); + map__fprintf(map, fp); + map__fprintf(pos, fp); + } + } + + rb_erase_init(&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 put_map; + } + + before->end = map->start; + __map_groups__insert(pos->groups, before); + if (verbose >= 2 && !use_browser) + map__fprintf(before, fp); + map__put(before); + } + + if (map->end < pos->end) { + struct map *after = map__clone(pos); + + if (after == NULL) { + err = -ENOMEM; + goto put_map; + } + + after->start = map->end; + after->pgoff += map->end - pos->start; + assert(pos->map_ip(pos, map->end) == after->map_ip(after, map->end)); + __map_groups__insert(pos->groups, after); + if (verbose >= 2 && !use_browser) + map__fprintf(after, fp); + map__put(after); + } +put_map: + map__put(pos); + + if (err) + goto out; + } + + err = 0; +out: + up_write(&maps->lock); + return err; +} + +int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map, + FILE *fp) +{ + return maps__fixup_overlappings(&mg->maps, map, fp); +} + +/* + * XXX This should not really _copy_ te maps, but refcount them. + */ +int map_groups__clone(struct thread *thread, struct map_groups *parent) +{ + struct map_groups *mg = thread->mg; + int err = -ENOMEM; + struct map *map; + struct maps *maps = &parent->maps; + + down_read(&maps->lock); + + for (map = maps__first(maps); map; map = map__next(map)) { + struct map *new = map__clone(map); + if (new == NULL) + goto out_unlock; + + err = unwind__prepare_access(thread, new, NULL); + if (err) + goto out_unlock; + + map_groups__insert(mg, new); + map__put(new); + } + + err = 0; +out_unlock: + up_read(&maps->lock); + return err; +} + +static void __maps__insert(struct maps *maps, struct map *map) +{ + struct rb_node **p = &maps->entries.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->entries); + map__get(map); +} + +void maps__insert(struct maps *maps, struct map *map) +{ + down_write(&maps->lock); + __maps__insert(maps, map); + up_write(&maps->lock); +} + +static void __maps__remove(struct maps *maps, struct map *map) +{ + rb_erase_init(&map->rb_node, &maps->entries); + map__put(map); +} + +void maps__remove(struct maps *maps, struct map *map) +{ + down_write(&maps->lock); + __maps__remove(maps, map); + up_write(&maps->lock); +} + +struct map *maps__find(struct maps *maps, u64 ip) +{ + struct rb_node **p, *parent = NULL; + struct map *m; + + down_read(&maps->lock); + + p = &maps->entries.rb_node; + 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 + goto out; + } + + m = NULL; +out: + up_read(&maps->lock); + return m; +} + +struct map *maps__first(struct maps *maps) +{ + struct rb_node *first = rb_first(&maps->entries); + + if (first) + return rb_entry(first, struct map, rb_node); + return NULL; +} + +struct map *map__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) + return NULL; + return (struct kmap *)(map + 1); +} + +struct kmap *map__kmap(struct map *map) +{ + struct kmap *kmap = __map__kmap(map); + + if (!kmap) + pr_err("Internal error: map__kmap with a non-kernel map\n"); + return kmap; +} + +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; +} |