summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/map.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/util/map.c')
-rw-r--r--tools/perf/util/map.c594
1 files changed, 594 insertions, 0 deletions
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
new file mode 100644
index 000000000..f3a3d9b3a
--- /dev/null
+++ b/tools/perf/util/map.c
@@ -0,0 +1,594 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <inttypes.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <linux/string.h>
+#include <linux/zalloc.h>
+#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
+#include "debug.h"
+#include "dso.h"
+#include "map.h"
+#include "namespaces.h"
+#include "srcline.h"
+#include "symbol.h"
+#include "thread.h"
+#include "vdso.h"
+
+static inline int is_android_lib(const char *filename)
+{
+ return strstarts(filename, "/data/app-lib/") ||
+ strstarts(filename, "/system/lib/");
+}
+
+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 (strstarts(filename, "/data/app-lib/")) {
+ 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 (strstarts(filename, "/system/lib/")) {
+ 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->erange_warned = false;
+ refcount_set(&map->refcnt, 1);
+}
+
+struct map *map__new(struct machine *machine, u64 start, u64 len,
+ u64 pgoff, struct dso_id *id,
+ u32 prot, u32 flags, struct build_id *bid,
+ 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, *header_bid_dso;
+ int anon, no_dso, vdso, android;
+
+ android = is_android_lib(filename);
+ anon = is_anon_memory(filename) || flags & MAP_HUGETLB;
+ vdso = is_vdso_map(filename);
+ no_dso = is_no_dso_memory(filename);
+ 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", nsinfo__pid(nsi));
+ 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);
+ nsinfo__clear_need_setns(nnsi);
+ nsi = nnsi;
+ }
+ pgoff = 0;
+ dso = machine__findnew_vdso(machine, thread);
+ } else
+ dso = machine__findnew_dso_id(machine, filename, id);
+
+ 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);
+ }
+ mutex_lock(&dso->lock);
+ nsinfo__put(dso->nsinfo);
+ dso->nsinfo = nsi;
+ mutex_unlock(&dso->lock);
+
+ if (build_id__is_defined(bid)) {
+ dso__set_build_id(dso, bid);
+ } else {
+ /*
+ * If the mmap event had no build ID, search for an existing dso from the
+ * build ID header by name. Otherwise only the dso loaded at the time of
+ * reading the header will have the build ID set and all future mmaps will
+ * have it missing.
+ */
+ down_read(&machine->dsos.lock);
+ header_bid_dso = __dsos__find(&machine->dsos, filename, false);
+ up_read(&machine->dsos.lock);
+ if (header_bid_dso && header_bid_dso->header_build_id) {
+ dso__set_build_id(dso, &header_bid_dso->bid);
+ dso->header_build_id = 1;
+ }
+ }
+ 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;
+}
+
+bool __map__is_kernel(const struct map *map)
+{
+ if (!map->dso->kernel)
+ return false;
+ return machine__kernel_map(map__kmaps((struct map *)map)->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__is_bpf_prog(const struct map *map)
+{
+ const char *name;
+
+ if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
+ return true;
+
+ /*
+ * If PERF_RECORD_BPF_EVENT is not included, the dso will not have
+ * type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
+ * guess the type based on name.
+ */
+ name = map->dso->short_name;
+ return name && (strstr(name, "bpf_prog_") == name);
+}
+
+bool __map__is_bpf_image(const struct map *map)
+{
+ const char *name;
+
+ if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
+ return true;
+
+ /*
+ * If PERF_RECORD_KSYMBOL is not included, the dso will not have
+ * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
+ * guess the type based on name.
+ */
+ name = map->dso->short_name;
+ return name && is_bpf_image(name);
+}
+
+bool __map__is_ool(const struct map *map)
+{
+ return map->dso && map->dso->binary_type == DSO_BINARY_TYPE__OOL;
+}
+
+bool map__has_symbols(const struct map *map)
+{
+ return dso__has_symbols(map->dso);
+}
+
+static void map__exit(struct map *map)
+{
+ BUG_ON(refcount_read(&map->refcnt) != 0);
+ 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_cached *symbols = &map->dso->symbols;
+ struct rb_node *nd = rb_first_cached(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_cached *symbols = &map->dso->symbols;
+ struct rb_node *nd = rb_last(&symbols->rb_root);
+ 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->bid, sbuild_id);
+ pr_debug("%s with build id %s not found", name, sbuild_id);
+ } else
+ pr_debug("Failed to open %s", name);
+
+ pr_debug(", 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_debug("%.*s was updated (is prelink enabled?). "
+ "Restart the long running apps that use it!\n",
+ (int)real_len, name);
+ } else {
+ pr_debug("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)
+{
+ size_t size = sizeof(struct map);
+ struct map *map;
+
+ if (from->dso && from->dso->kernel)
+ size += sizeof(struct kmap);
+
+ map = memdup(from, size);
+ if (map != NULL) {
+ refcount_set(&map->refcnt, 1);
+ RB_CLEAR_NODE(&map->rb_node);
+ dso__get(map->dso);
+ }
+
+ 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)
+{
+ char buf[symbol_conf.pad_output_len_dso + 1];
+ 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;
+ }
+
+ if (symbol_conf.pad_output_len_dso) {
+ scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
+ dsoname = buf;
+ }
+
+ 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 (strncmp(srcline, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)
+ ret = fprintf(fp, "%s%s", prefix, srcline);
+ free_srcline(srcline);
+ }
+ return ret;
+}
+
+void srccode_state_free(struct srccode_state *state)
+{
+ zfree(&state->srcfile);
+ state->line = 0;
+}
+
+/**
+ * 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_SPACE__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_SPACE__USER)
+ return map->unmap_ip(map, ip - map->dso->text_offset);
+
+ return ip + map->reloc;
+}
+
+bool map__contains_symbol(const struct map *map, const struct symbol *sym)
+{
+ u64 ip = map->unmap_ip(map, sym->start);
+
+ return ip >= map->start && ip < map->end;
+}
+
+static 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 map *map__next(struct map *map)
+{
+ return map ? __map__next(map) : 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 maps *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;
+}
+
+u64 map__map_ip(const struct map *map, u64 ip)
+{
+ return ip - map->start + map->pgoff;
+}
+
+u64 map__unmap_ip(const struct map *map, u64 ip)
+{
+ return ip + map->start - map->pgoff;
+}
+
+u64 identity__map_ip(const struct map *map __maybe_unused, u64 ip)
+{
+ return ip;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 11:25:53 +0000