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d3b52f71d1
Print dso offset only for object files, and in those cases force using the dso->long_name if the dso->name starts with '[' or the dso is kcore, in order to avoid special names such as [vdso], or mixing up kcore with vmlinux. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lore.kernel.org/r/20230424055107.12105-3-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
642 lines
15 KiB
C
642 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <inttypes.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/string.h>
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#include <linux/zalloc.h>
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#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
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#include "debug.h"
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#include "dso.h"
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#include "map.h"
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#include "namespaces.h"
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#include "srcline.h"
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#include "symbol.h"
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#include "thread.h"
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#include "vdso.h"
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static inline int is_android_lib(const char *filename)
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{
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return strstarts(filename, "/data/app-lib/") ||
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strstarts(filename, "/system/lib/");
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}
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static inline bool replace_android_lib(const char *filename, char *newfilename)
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{
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const char *libname;
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char *app_abi;
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size_t app_abi_length, new_length;
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size_t lib_length = 0;
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libname = strrchr(filename, '/');
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if (libname)
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lib_length = strlen(libname);
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app_abi = getenv("APP_ABI");
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if (!app_abi)
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return false;
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app_abi_length = strlen(app_abi);
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if (strstarts(filename, "/data/app-lib/")) {
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char *apk_path;
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if (!app_abi_length)
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return false;
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new_length = 7 + app_abi_length + lib_length;
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apk_path = getenv("APK_PATH");
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if (apk_path) {
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new_length += strlen(apk_path) + 1;
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if (new_length > PATH_MAX)
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return false;
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snprintf(newfilename, new_length,
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"%s/libs/%s/%s", apk_path, app_abi, libname);
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} else {
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if (new_length > PATH_MAX)
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return false;
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snprintf(newfilename, new_length,
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"libs/%s/%s", app_abi, libname);
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}
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return true;
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}
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if (strstarts(filename, "/system/lib/")) {
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char *ndk, *app;
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const char *arch;
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int ndk_length, app_length;
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ndk = getenv("NDK_ROOT");
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app = getenv("APP_PLATFORM");
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if (!(ndk && app))
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return false;
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ndk_length = strlen(ndk);
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app_length = strlen(app);
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if (!(ndk_length && app_length && app_abi_length))
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return false;
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arch = !strncmp(app_abi, "arm", 3) ? "arm" :
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!strncmp(app_abi, "mips", 4) ? "mips" :
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!strncmp(app_abi, "x86", 3) ? "x86" : NULL;
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if (!arch)
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return false;
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new_length = 27 + ndk_length +
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app_length + lib_length
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+ strlen(arch);
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if (new_length > PATH_MAX)
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return false;
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snprintf(newfilename, new_length,
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"%.*s/platforms/%.*s/arch-%s/usr/lib/%s",
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ndk_length, ndk, app_length, app, arch, libname);
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return true;
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}
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return false;
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}
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void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
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{
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map__set_start(map, start);
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map__set_end(map, end);
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map__set_pgoff(map, pgoff);
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map__set_reloc(map, 0);
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map__set_dso(map, dso__get(dso));
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map__set_map_ip(map, map__dso_map_ip);
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map__set_unmap_ip(map, map__dso_unmap_ip);
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map__set_erange_warned(map, false);
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refcount_set(map__refcnt(map), 1);
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}
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struct map *map__new(struct machine *machine, u64 start, u64 len,
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u64 pgoff, struct dso_id *id,
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u32 prot, u32 flags, struct build_id *bid,
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char *filename, struct thread *thread)
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{
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struct map *result;
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RC_STRUCT(map) *map;
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struct nsinfo *nsi = NULL;
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struct nsinfo *nnsi;
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map = malloc(sizeof(*map));
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if (ADD_RC_CHK(result, map)) {
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char newfilename[PATH_MAX];
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struct dso *dso, *header_bid_dso;
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int anon, no_dso, vdso, android;
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android = is_android_lib(filename);
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anon = is_anon_memory(filename) || flags & MAP_HUGETLB;
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vdso = is_vdso_map(filename);
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no_dso = is_no_dso_memory(filename);
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map->prot = prot;
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map->flags = flags;
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nsi = nsinfo__get(thread->nsinfo);
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if ((anon || no_dso) && nsi && (prot & PROT_EXEC)) {
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snprintf(newfilename, sizeof(newfilename),
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"/tmp/perf-%d.map", nsinfo__pid(nsi));
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filename = newfilename;
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}
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if (android) {
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if (replace_android_lib(filename, newfilename))
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filename = newfilename;
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}
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if (vdso) {
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/* The vdso maps are always on the host and not the
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* container. Ensure that we don't use setns to look
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* them up.
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*/
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nnsi = nsinfo__copy(nsi);
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if (nnsi) {
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nsinfo__put(nsi);
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nsinfo__clear_need_setns(nnsi);
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nsi = nnsi;
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}
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pgoff = 0;
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dso = machine__findnew_vdso(machine, thread);
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} else
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dso = machine__findnew_dso_id(machine, filename, id);
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if (dso == NULL)
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goto out_delete;
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map__init(result, start, start + len, pgoff, dso);
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if (anon || no_dso) {
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map->map_ip = map->unmap_ip = identity__map_ip;
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/*
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* Set memory without DSO as loaded. All map__find_*
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* functions still return NULL, and we avoid the
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* unnecessary map__load warning.
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*/
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if (!(prot & PROT_EXEC))
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dso__set_loaded(dso);
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}
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mutex_lock(&dso->lock);
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nsinfo__put(dso->nsinfo);
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dso->nsinfo = nsi;
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mutex_unlock(&dso->lock);
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if (build_id__is_defined(bid)) {
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dso__set_build_id(dso, bid);
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} else {
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/*
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* If the mmap event had no build ID, search for an existing dso from the
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* build ID header by name. Otherwise only the dso loaded at the time of
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* reading the header will have the build ID set and all future mmaps will
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* have it missing.
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*/
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down_read(&machine->dsos.lock);
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header_bid_dso = __dsos__find(&machine->dsos, filename, false);
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up_read(&machine->dsos.lock);
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if (header_bid_dso && header_bid_dso->header_build_id) {
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dso__set_build_id(dso, &header_bid_dso->bid);
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dso->header_build_id = 1;
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}
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}
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dso__put(dso);
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}
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return result;
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out_delete:
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nsinfo__put(nsi);
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RC_CHK_FREE(result);
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return NULL;
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}
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/*
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* Constructor variant for modules (where we know from /proc/modules where
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* they are loaded) and for vmlinux, where only after we load all the
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* symbols we'll know where it starts and ends.
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*/
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struct map *map__new2(u64 start, struct dso *dso)
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{
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struct map *result;
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RC_STRUCT(map) *map;
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map = calloc(1, sizeof(*map) + (dso->kernel ? sizeof(struct kmap) : 0));
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if (ADD_RC_CHK(result, map)) {
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/*
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* ->end will be filled after we load all the symbols
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*/
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map__init(result, start, 0, 0, dso);
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}
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return result;
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}
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bool __map__is_kernel(const struct map *map)
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{
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if (!map__dso(map)->kernel)
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return false;
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return machine__kernel_map(maps__machine(map__kmaps((struct map *)map))) == map;
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}
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bool __map__is_extra_kernel_map(const struct map *map)
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{
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struct kmap *kmap = __map__kmap((struct map *)map);
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return kmap && kmap->name[0];
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}
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bool __map__is_bpf_prog(const struct map *map)
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{
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const char *name;
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struct dso *dso = map__dso(map);
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if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
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return true;
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/*
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* If PERF_RECORD_BPF_EVENT is not included, the dso will not have
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* type of DSO_BINARY_TYPE__BPF_PROG_INFO. In such cases, we can
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* guess the type based on name.
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*/
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name = dso->short_name;
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return name && (strstr(name, "bpf_prog_") == name);
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}
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bool __map__is_bpf_image(const struct map *map)
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{
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const char *name;
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struct dso *dso = map__dso(map);
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if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
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return true;
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/*
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* If PERF_RECORD_KSYMBOL is not included, the dso will not have
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* type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
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* guess the type based on name.
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*/
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name = dso->short_name;
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return name && is_bpf_image(name);
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}
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bool __map__is_ool(const struct map *map)
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{
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const struct dso *dso = map__dso(map);
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return dso && dso->binary_type == DSO_BINARY_TYPE__OOL;
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}
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bool map__has_symbols(const struct map *map)
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{
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return dso__has_symbols(map__dso(map));
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}
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static void map__exit(struct map *map)
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{
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BUG_ON(refcount_read(map__refcnt(map)) != 0);
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dso__zput(RC_CHK_ACCESS(map)->dso);
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}
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void map__delete(struct map *map)
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{
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map__exit(map);
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RC_CHK_FREE(map);
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}
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void map__put(struct map *map)
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{
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if (map && refcount_dec_and_test(map__refcnt(map)))
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map__delete(map);
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else
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RC_CHK_PUT(map);
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}
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void map__fixup_start(struct map *map)
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{
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struct dso *dso = map__dso(map);
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struct rb_root_cached *symbols = &dso->symbols;
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struct rb_node *nd = rb_first_cached(symbols);
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if (nd != NULL) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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map__set_start(map, sym->start);
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}
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}
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void map__fixup_end(struct map *map)
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{
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struct dso *dso = map__dso(map);
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struct rb_root_cached *symbols = &dso->symbols;
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struct rb_node *nd = rb_last(&symbols->rb_root);
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if (nd != NULL) {
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struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
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map__set_end(map, sym->end);
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}
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}
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#define DSO__DELETED "(deleted)"
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int map__load(struct map *map)
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{
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struct dso *dso = map__dso(map);
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const char *name = dso->long_name;
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int nr;
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if (dso__loaded(dso))
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return 0;
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nr = dso__load(dso, map);
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if (nr < 0) {
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if (dso->has_build_id) {
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char sbuild_id[SBUILD_ID_SIZE];
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build_id__sprintf(&dso->bid, sbuild_id);
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pr_debug("%s with build id %s not found", name, sbuild_id);
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} else
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pr_debug("Failed to open %s", name);
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pr_debug(", continuing without symbols\n");
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return -1;
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} else if (nr == 0) {
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#ifdef HAVE_LIBELF_SUPPORT
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const size_t len = strlen(name);
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const size_t real_len = len - sizeof(DSO__DELETED);
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if (len > sizeof(DSO__DELETED) &&
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strcmp(name + real_len + 1, DSO__DELETED) == 0) {
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pr_debug("%.*s was updated (is prelink enabled?). "
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"Restart the long running apps that use it!\n",
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(int)real_len, name);
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} else {
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pr_debug("no symbols found in %s, maybe install a debug package?\n", name);
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}
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#endif
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return -1;
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}
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return 0;
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}
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struct symbol *map__find_symbol(struct map *map, u64 addr)
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{
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if (map__load(map) < 0)
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return NULL;
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return dso__find_symbol(map__dso(map), addr);
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}
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struct symbol *map__find_symbol_by_name(struct map *map, const char *name)
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{
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struct dso *dso;
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if (map__load(map) < 0)
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return NULL;
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dso = map__dso(map);
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if (!dso__sorted_by_name(dso))
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dso__sort_by_name(dso);
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return dso__find_symbol_by_name(dso, name);
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}
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struct map *map__clone(struct map *from)
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{
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struct map *result;
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RC_STRUCT(map) *map;
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size_t size = sizeof(RC_STRUCT(map));
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struct dso *dso = map__dso(from);
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if (dso && dso->kernel)
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size += sizeof(struct kmap);
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map = memdup(RC_CHK_ACCESS(from), size);
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if (ADD_RC_CHK(result, map)) {
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refcount_set(&map->refcnt, 1);
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map->dso = dso__get(dso);
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}
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return result;
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}
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size_t map__fprintf(struct map *map, FILE *fp)
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{
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const struct dso *dso = map__dso(map);
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return fprintf(fp, " %" PRIx64 "-%" PRIx64 " %" PRIx64 " %s\n",
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map__start(map), map__end(map), map__pgoff(map), dso->name);
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}
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static bool prefer_dso_long_name(const struct dso *dso, bool print_off)
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{
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return dso->long_name &&
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(symbol_conf.show_kernel_path ||
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(print_off && (dso->name[0] == '[' || dso__is_kcore(dso))));
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}
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static size_t __map__fprintf_dsoname(struct map *map, bool print_off, FILE *fp)
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{
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char buf[symbol_conf.pad_output_len_dso + 1];
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const char *dsoname = "[unknown]";
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const struct dso *dso = map ? map__dso(map) : NULL;
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if (dso) {
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if (prefer_dso_long_name(dso, print_off))
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dsoname = dso->long_name;
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else
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dsoname = dso->name;
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}
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if (symbol_conf.pad_output_len_dso) {
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scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
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dsoname = buf;
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}
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return fprintf(fp, "%s", dsoname);
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}
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size_t map__fprintf_dsoname(struct map *map, FILE *fp)
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{
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return __map__fprintf_dsoname(map, false, fp);
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}
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size_t map__fprintf_dsoname_dsoff(struct map *map, bool print_off, u64 addr, FILE *fp)
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{
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const struct dso *dso = map ? map__dso(map) : NULL;
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int printed = 0;
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if (print_off && (!dso || !dso__is_object_file(dso)))
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print_off = false;
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printed += fprintf(fp, " (");
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printed += __map__fprintf_dsoname(map, print_off, fp);
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if (print_off)
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printed += fprintf(fp, "+0x%" PRIx64, addr);
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printed += fprintf(fp, ")");
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return printed;
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}
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char *map__srcline(struct map *map, u64 addr, struct symbol *sym)
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{
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if (map == NULL)
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return SRCLINE_UNKNOWN;
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return get_srcline(map__dso(map), map__rip_2objdump(map, addr), sym, true, true, addr);
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}
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int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
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FILE *fp)
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{
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const struct dso *dso = map ? map__dso(map) : NULL;
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int ret = 0;
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if (dso) {
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char *srcline = map__srcline(map, addr, NULL);
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if (strncmp(srcline, SRCLINE_UNKNOWN, strlen(SRCLINE_UNKNOWN)) != 0)
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ret = fprintf(fp, "%s%s", prefix, srcline);
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free_srcline(srcline);
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}
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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);
|
|
const struct dso *dso = map__dso(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) {
|
|
struct machine *machine = maps__machine(kmap->kmaps);
|
|
|
|
if (machine) {
|
|
struct map *kernel_map = machine__kernel_map(machine);
|
|
|
|
if (kernel_map)
|
|
map = kernel_map;
|
|
}
|
|
}
|
|
|
|
if (!dso->adjust_symbols)
|
|
return rip;
|
|
|
|
if (dso->rel)
|
|
return rip - map__pgoff(map);
|
|
|
|
/*
|
|
* kernel modules also have DSO_TYPE_USER in dso->kernel,
|
|
* but all kernel modules are ET_REL, so won't get here.
|
|
*/
|
|
if (dso->kernel == DSO_SPACE__USER)
|
|
return rip + dso->text_offset;
|
|
|
|
return map__unmap_ip(map, rip) - map__reloc(map);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
const struct dso *dso = map__dso(map);
|
|
|
|
if (!dso->adjust_symbols)
|
|
return map__unmap_ip(map, ip);
|
|
|
|
if (dso->rel)
|
|
return map__unmap_ip(map, ip + map__pgoff(map));
|
|
|
|
/*
|
|
* kernel modules also have DSO_TYPE_USER in dso->kernel,
|
|
* but all kernel modules are ET_REL, so won't get here.
|
|
*/
|
|
if (dso->kernel == DSO_SPACE__USER)
|
|
return map__unmap_ip(map, ip - dso->text_offset);
|
|
|
|
return ip + map__reloc(map);
|
|
}
|
|
|
|
bool map__contains_symbol(const struct map *map, const struct symbol *sym)
|
|
{
|
|
u64 ip = map__unmap_ip(map, sym->start);
|
|
|
|
return ip >= map__start(map) && ip < map__end(map);
|
|
}
|
|
|
|
struct kmap *__map__kmap(struct map *map)
|
|
{
|
|
const struct dso *dso = map__dso(map);
|
|
|
|
if (!dso || !dso->kernel)
|
|
return NULL;
|
|
return (struct kmap *)(&RC_CHK_ACCESS(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__dso_map_ip(const struct map *map, u64 ip)
|
|
{
|
|
return ip - map__start(map) + map__pgoff(map);
|
|
}
|
|
|
|
u64 map__dso_unmap_ip(const struct map *map, u64 ip)
|
|
{
|
|
return ip + map__start(map) - map__pgoff(map);
|
|
}
|
|
|
|
u64 identity__map_ip(const struct map *map __maybe_unused, u64 ip)
|
|
{
|
|
return ip;
|
|
}
|