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954 lines
22 KiB
954 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* build-id.c |
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* |
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* build-id support |
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* |
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* Copyright (C) 2009, 2010 Red Hat Inc. |
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* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <[email protected]> |
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*/ |
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#include "util.h" // lsdir(), mkdir_p(), rm_rf() |
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#include <dirent.h> |
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#include <errno.h> |
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#include <stdio.h> |
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#include <sys/stat.h> |
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#include <sys/types.h> |
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#include "util/copyfile.h" |
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#include "dso.h" |
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#include "build-id.h" |
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#include "event.h" |
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#include "namespaces.h" |
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#include "map.h" |
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#include "symbol.h" |
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#include "thread.h" |
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#include <linux/kernel.h> |
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#include "debug.h" |
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#include "session.h" |
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#include "tool.h" |
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#include "header.h" |
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#include "vdso.h" |
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#include "path.h" |
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#include "probe-file.h" |
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#include "strlist.h" |
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|
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#ifdef HAVE_DEBUGINFOD_SUPPORT |
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#include <elfutils/debuginfod.h> |
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#endif |
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|
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#include <linux/ctype.h> |
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#include <linux/zalloc.h> |
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#include <linux/string.h> |
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#include <asm/bug.h> |
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|
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static bool no_buildid_cache; |
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|
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int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused, |
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union perf_event *event, |
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struct perf_sample *sample, |
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struct evsel *evsel __maybe_unused, |
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struct machine *machine) |
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{ |
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struct addr_location al; |
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struct thread *thread = machine__findnew_thread(machine, sample->pid, |
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sample->tid); |
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|
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if (thread == NULL) { |
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pr_err("problem processing %d event, skipping it.\n", |
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event->header.type); |
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return -1; |
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} |
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if (thread__find_map(thread, sample->cpumode, sample->ip, &al)) |
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al.map->dso->hit = 1; |
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|
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thread__put(thread); |
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return 0; |
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} |
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static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused, |
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union perf_event *event, |
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struct perf_sample *sample |
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__maybe_unused, |
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struct machine *machine) |
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{ |
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struct thread *thread = machine__findnew_thread(machine, |
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event->fork.pid, |
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event->fork.tid); |
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dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid, |
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event->fork.ppid, event->fork.ptid); |
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if (thread) { |
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machine__remove_thread(machine, thread); |
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thread__put(thread); |
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} |
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return 0; |
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} |
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struct perf_tool build_id__mark_dso_hit_ops = { |
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.sample = build_id__mark_dso_hit, |
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.mmap = perf_event__process_mmap, |
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.mmap2 = perf_event__process_mmap2, |
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.fork = perf_event__process_fork, |
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.exit = perf_event__exit_del_thread, |
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.attr = perf_event__process_attr, |
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.build_id = perf_event__process_build_id, |
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.ordered_events = true, |
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}; |
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int build_id__sprintf(const struct build_id *build_id, char *bf) |
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{ |
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char *bid = bf; |
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const u8 *raw = build_id->data; |
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size_t i; |
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bf[0] = 0x0; |
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for (i = 0; i < build_id->size; ++i) { |
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sprintf(bid, "%02x", *raw); |
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++raw; |
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bid += 2; |
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} |
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return (bid - bf) + 1; |
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} |
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int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id) |
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{ |
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char notes[PATH_MAX]; |
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struct build_id bid; |
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int ret; |
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|
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if (!root_dir) |
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root_dir = ""; |
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scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir); |
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ret = sysfs__read_build_id(notes, &bid); |
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if (ret < 0) |
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return ret; |
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return build_id__sprintf(&bid, sbuild_id); |
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} |
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int filename__sprintf_build_id(const char *pathname, char *sbuild_id) |
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{ |
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struct build_id bid; |
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int ret; |
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ret = filename__read_build_id(pathname, &bid); |
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if (ret < 0) |
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return ret; |
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return build_id__sprintf(&bid, sbuild_id); |
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} |
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/* asnprintf consolidates asprintf and snprintf */ |
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static int asnprintf(char **strp, size_t size, const char *fmt, ...) |
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{ |
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va_list ap; |
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int ret; |
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if (!strp) |
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return -EINVAL; |
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va_start(ap, fmt); |
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if (*strp) |
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ret = vsnprintf(*strp, size, fmt, ap); |
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else |
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ret = vasprintf(strp, fmt, ap); |
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va_end(ap); |
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return ret; |
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} |
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char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf, |
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size_t size) |
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{ |
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bool retry_old = true; |
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snprintf(bf, size, "%s/%s/%s/kallsyms", |
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buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); |
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retry: |
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if (!access(bf, F_OK)) |
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return bf; |
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if (retry_old) { |
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/* Try old style kallsyms cache */ |
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snprintf(bf, size, "%s/%s/%s", |
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buildid_dir, DSO__NAME_KALLSYMS, sbuild_id); |
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retry_old = false; |
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goto retry; |
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} |
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return NULL; |
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} |
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char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size) |
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{ |
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char *tmp = bf; |
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int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir, |
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sbuild_id, sbuild_id + 2); |
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if (ret < 0 || (tmp && size < (unsigned int)ret)) |
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return NULL; |
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return bf; |
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} |
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/* The caller is responsible to free the returned buffer. */ |
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char *build_id_cache__origname(const char *sbuild_id) |
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{ |
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char *linkname; |
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char buf[PATH_MAX]; |
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char *ret = NULL, *p; |
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size_t offs = 5; /* == strlen("../..") */ |
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ssize_t len; |
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linkname = build_id_cache__linkname(sbuild_id, NULL, 0); |
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if (!linkname) |
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return NULL; |
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len = readlink(linkname, buf, sizeof(buf) - 1); |
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if (len <= 0) |
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goto out; |
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buf[len] = '\0'; |
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/* The link should be "../..<origpath>/<sbuild_id>" */ |
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p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */ |
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if (p && (p > buf + offs)) { |
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*p = '\0'; |
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if (buf[offs + 1] == '[') |
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offs++; /* |
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* This is a DSO name, like [kernel.kallsyms]. |
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* Skip the first '/', since this is not the |
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* cache of a regular file. |
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*/ |
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ret = strdup(buf + offs); /* Skip "../..[/]" */ |
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} |
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out: |
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free(linkname); |
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return ret; |
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} |
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/* Check if the given build_id cache is valid on current running system */ |
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static bool build_id_cache__valid_id(char *sbuild_id) |
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{ |
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char real_sbuild_id[SBUILD_ID_SIZE] = ""; |
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char *pathname; |
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int ret = 0; |
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bool result = false; |
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pathname = build_id_cache__origname(sbuild_id); |
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if (!pathname) |
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return false; |
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if (!strcmp(pathname, DSO__NAME_KALLSYMS)) |
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ret = sysfs__sprintf_build_id("/", real_sbuild_id); |
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else if (pathname[0] == '/') |
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ret = filename__sprintf_build_id(pathname, real_sbuild_id); |
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else |
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ret = -EINVAL; /* Should we support other special DSO cache? */ |
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if (ret >= 0) |
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result = (strcmp(sbuild_id, real_sbuild_id) == 0); |
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free(pathname); |
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return result; |
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} |
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static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso, |
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bool is_debug) |
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{ |
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return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : (is_debug ? |
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"debug" : "elf")); |
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} |
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char *__dso__build_id_filename(const struct dso *dso, char *bf, size_t size, |
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bool is_debug, bool is_kallsyms) |
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{ |
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bool is_vdso = dso__is_vdso((struct dso *)dso); |
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char sbuild_id[SBUILD_ID_SIZE]; |
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char *linkname; |
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bool alloc = (bf == NULL); |
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int ret; |
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if (!dso->has_build_id) |
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return NULL; |
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build_id__sprintf(&dso->bid, sbuild_id); |
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linkname = build_id_cache__linkname(sbuild_id, NULL, 0); |
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if (!linkname) |
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return NULL; |
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/* Check if old style build_id cache */ |
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if (is_regular_file(linkname)) |
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ret = asnprintf(&bf, size, "%s", linkname); |
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else |
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ret = asnprintf(&bf, size, "%s/%s", linkname, |
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build_id_cache__basename(is_kallsyms, is_vdso, |
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is_debug)); |
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if (ret < 0 || (!alloc && size < (unsigned int)ret)) |
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bf = NULL; |
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free(linkname); |
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return bf; |
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} |
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char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size, |
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bool is_debug) |
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{ |
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bool is_kallsyms = dso__is_kallsyms((struct dso *)dso); |
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return __dso__build_id_filename(dso, bf, size, is_debug, is_kallsyms); |
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} |
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#define dsos__for_each_with_build_id(pos, head) \ |
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list_for_each_entry(pos, head, node) \ |
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if (!pos->has_build_id) \ |
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continue; \ |
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else |
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static int write_buildid(const char *name, size_t name_len, struct build_id *bid, |
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pid_t pid, u16 misc, struct feat_fd *fd) |
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{ |
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int err; |
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struct perf_record_header_build_id b; |
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size_t len; |
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len = name_len + 1; |
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len = PERF_ALIGN(len, NAME_ALIGN); |
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memset(&b, 0, sizeof(b)); |
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memcpy(&b.data, bid->data, bid->size); |
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b.size = (u8) bid->size; |
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misc |= PERF_RECORD_MISC_BUILD_ID_SIZE; |
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b.pid = pid; |
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b.header.misc = misc; |
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b.header.size = sizeof(b) + len; |
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err = do_write(fd, &b, sizeof(b)); |
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if (err < 0) |
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return err; |
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return write_padded(fd, name, name_len + 1, len); |
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} |
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static int machine__write_buildid_table(struct machine *machine, |
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struct feat_fd *fd) |
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{ |
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int err = 0; |
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struct dso *pos; |
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u16 kmisc = PERF_RECORD_MISC_KERNEL, |
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umisc = PERF_RECORD_MISC_USER; |
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if (!machine__is_host(machine)) { |
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kmisc = PERF_RECORD_MISC_GUEST_KERNEL; |
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umisc = PERF_RECORD_MISC_GUEST_USER; |
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} |
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dsos__for_each_with_build_id(pos, &machine->dsos.head) { |
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const char *name; |
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size_t name_len; |
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bool in_kernel = false; |
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if (!pos->hit && !dso__is_vdso(pos)) |
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continue; |
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if (dso__is_vdso(pos)) { |
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name = pos->short_name; |
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name_len = pos->short_name_len; |
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} else if (dso__is_kcore(pos)) { |
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name = machine->mmap_name; |
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name_len = strlen(name); |
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} else { |
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name = pos->long_name; |
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name_len = pos->long_name_len; |
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} |
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in_kernel = pos->kernel || |
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is_kernel_module(name, |
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PERF_RECORD_MISC_CPUMODE_UNKNOWN); |
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err = write_buildid(name, name_len, &pos->bid, machine->pid, |
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in_kernel ? kmisc : umisc, fd); |
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if (err) |
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break; |
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} |
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return err; |
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} |
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int perf_session__write_buildid_table(struct perf_session *session, |
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struct feat_fd *fd) |
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{ |
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struct rb_node *nd; |
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int err = machine__write_buildid_table(&session->machines.host, fd); |
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if (err) |
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return err; |
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for (nd = rb_first_cached(&session->machines.guests); nd; |
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nd = rb_next(nd)) { |
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struct machine *pos = rb_entry(nd, struct machine, rb_node); |
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err = machine__write_buildid_table(pos, fd); |
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if (err) |
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break; |
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} |
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return err; |
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} |
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static int __dsos__hit_all(struct list_head *head) |
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{ |
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struct dso *pos; |
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list_for_each_entry(pos, head, node) |
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pos->hit = true; |
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return 0; |
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} |
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static int machine__hit_all_dsos(struct machine *machine) |
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{ |
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return __dsos__hit_all(&machine->dsos.head); |
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} |
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|
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int dsos__hit_all(struct perf_session *session) |
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{ |
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struct rb_node *nd; |
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int err; |
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err = machine__hit_all_dsos(&session->machines.host); |
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if (err) |
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return err; |
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for (nd = rb_first_cached(&session->machines.guests); nd; |
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nd = rb_next(nd)) { |
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struct machine *pos = rb_entry(nd, struct machine, rb_node); |
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err = machine__hit_all_dsos(pos); |
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if (err) |
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return err; |
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} |
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return 0; |
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} |
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void disable_buildid_cache(void) |
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{ |
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no_buildid_cache = true; |
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} |
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static bool lsdir_bid_head_filter(const char *name __maybe_unused, |
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struct dirent *d) |
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{ |
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return (strlen(d->d_name) == 2) && |
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isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]); |
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} |
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static bool lsdir_bid_tail_filter(const char *name __maybe_unused, |
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struct dirent *d) |
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{ |
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int i = 0; |
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while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3) |
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i++; |
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return (i >= SBUILD_ID_MIN_SIZE - 3) && (i <= SBUILD_ID_SIZE - 3) && |
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(d->d_name[i] == '\0'); |
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} |
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struct strlist *build_id_cache__list_all(bool validonly) |
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{ |
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struct strlist *toplist, *linklist = NULL, *bidlist; |
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struct str_node *nd, *nd2; |
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char *topdir, *linkdir = NULL; |
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char sbuild_id[SBUILD_ID_SIZE]; |
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|
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/* for filename__ functions */ |
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if (validonly) |
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symbol__init(NULL); |
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|
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/* Open the top-level directory */ |
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if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0) |
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return NULL; |
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bidlist = strlist__new(NULL, NULL); |
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if (!bidlist) |
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goto out; |
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toplist = lsdir(topdir, lsdir_bid_head_filter); |
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if (!toplist) { |
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pr_debug("Error in lsdir(%s): %d\n", topdir, errno); |
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/* If there is no buildid cache, return an empty list */ |
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if (errno == ENOENT) |
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goto out; |
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goto err_out; |
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} |
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strlist__for_each_entry(nd, toplist) { |
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if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0) |
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goto err_out; |
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/* Open the lower-level directory */ |
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linklist = lsdir(linkdir, lsdir_bid_tail_filter); |
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if (!linklist) { |
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pr_debug("Error in lsdir(%s): %d\n", linkdir, errno); |
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goto err_out; |
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} |
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strlist__for_each_entry(nd2, linklist) { |
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if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s", |
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nd->s, nd2->s) > SBUILD_ID_SIZE - 1) |
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goto err_out; |
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if (validonly && !build_id_cache__valid_id(sbuild_id)) |
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continue; |
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if (strlist__add(bidlist, sbuild_id) < 0) |
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goto err_out; |
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} |
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strlist__delete(linklist); |
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zfree(&linkdir); |
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} |
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out_free: |
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strlist__delete(toplist); |
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out: |
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free(topdir); |
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|
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return bidlist; |
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err_out: |
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strlist__delete(linklist); |
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zfree(&linkdir); |
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strlist__delete(bidlist); |
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bidlist = NULL; |
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goto out_free; |
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} |
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static bool str_is_build_id(const char *maybe_sbuild_id, size_t len) |
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{ |
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size_t i; |
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|
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for (i = 0; i < len; i++) { |
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if (!isxdigit(maybe_sbuild_id[i])) |
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return false; |
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} |
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return true; |
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} |
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|
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/* Return the valid complete build-id */ |
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char *build_id_cache__complement(const char *incomplete_sbuild_id) |
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{ |
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struct strlist *bidlist; |
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struct str_node *nd, *cand = NULL; |
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char *sbuild_id = NULL; |
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size_t len = strlen(incomplete_sbuild_id); |
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|
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if (len >= SBUILD_ID_SIZE || |
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!str_is_build_id(incomplete_sbuild_id, len)) |
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return NULL; |
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bidlist = build_id_cache__list_all(true); |
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if (!bidlist) |
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return NULL; |
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|
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strlist__for_each_entry(nd, bidlist) { |
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if (strncmp(nd->s, incomplete_sbuild_id, len) != 0) |
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continue; |
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if (cand) { /* Error: There are more than 2 candidates. */ |
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cand = NULL; |
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break; |
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} |
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cand = nd; |
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} |
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if (cand) |
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sbuild_id = strdup(cand->s); |
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strlist__delete(bidlist); |
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|
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return sbuild_id; |
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} |
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char *build_id_cache__cachedir(const char *sbuild_id, const char *name, |
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struct nsinfo *nsi, bool is_kallsyms, |
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bool is_vdso) |
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{ |
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char *realname = (char *)name, *filename; |
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bool slash = is_kallsyms || is_vdso; |
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|
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if (!slash) { |
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realname = nsinfo__realpath(name, nsi); |
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if (!realname) |
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return NULL; |
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} |
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|
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if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "", |
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is_vdso ? DSO__NAME_VDSO : realname, |
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sbuild_id ? "/" : "", sbuild_id ?: "") < 0) |
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filename = NULL; |
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|
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if (!slash) |
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free(realname); |
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|
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return filename; |
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} |
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|
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int build_id_cache__list_build_ids(const char *pathname, struct nsinfo *nsi, |
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struct strlist **result) |
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{ |
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char *dir_name; |
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int ret = 0; |
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|
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dir_name = build_id_cache__cachedir(NULL, pathname, nsi, false, false); |
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if (!dir_name) |
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return -ENOMEM; |
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|
|
*result = lsdir(dir_name, lsdir_no_dot_filter); |
|
if (!*result) |
|
ret = -errno; |
|
free(dir_name); |
|
|
|
return ret; |
|
} |
|
|
|
#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT) |
|
static int build_id_cache__add_sdt_cache(const char *sbuild_id, |
|
const char *realname, |
|
struct nsinfo *nsi) |
|
{ |
|
struct probe_cache *cache; |
|
int ret; |
|
struct nscookie nsc; |
|
|
|
cache = probe_cache__new(sbuild_id, nsi); |
|
if (!cache) |
|
return -1; |
|
|
|
nsinfo__mountns_enter(nsi, &nsc); |
|
ret = probe_cache__scan_sdt(cache, realname); |
|
nsinfo__mountns_exit(&nsc); |
|
if (ret >= 0) { |
|
pr_debug4("Found %d SDTs in %s\n", ret, realname); |
|
if (probe_cache__commit(cache) < 0) |
|
ret = -1; |
|
} |
|
probe_cache__delete(cache); |
|
return ret; |
|
} |
|
#else |
|
#define build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) (0) |
|
#endif |
|
|
|
static char *build_id_cache__find_debug(const char *sbuild_id, |
|
struct nsinfo *nsi) |
|
{ |
|
char *realname = NULL; |
|
char *debugfile; |
|
struct nscookie nsc; |
|
size_t len = 0; |
|
|
|
debugfile = calloc(1, PATH_MAX); |
|
if (!debugfile) |
|
goto out; |
|
|
|
len = __symbol__join_symfs(debugfile, PATH_MAX, |
|
"/usr/lib/debug/.build-id/"); |
|
snprintf(debugfile + len, PATH_MAX - len, "%.2s/%s.debug", sbuild_id, |
|
sbuild_id + 2); |
|
|
|
nsinfo__mountns_enter(nsi, &nsc); |
|
realname = realpath(debugfile, NULL); |
|
if (realname && access(realname, R_OK)) |
|
zfree(&realname); |
|
nsinfo__mountns_exit(&nsc); |
|
|
|
#ifdef HAVE_DEBUGINFOD_SUPPORT |
|
if (realname == NULL) { |
|
debuginfod_client* c = debuginfod_begin(); |
|
if (c != NULL) { |
|
int fd = debuginfod_find_debuginfo(c, |
|
(const unsigned char*)sbuild_id, 0, |
|
&realname); |
|
if (fd >= 0) |
|
close(fd); /* retaining reference by realname */ |
|
debuginfod_end(c); |
|
} |
|
} |
|
#endif |
|
|
|
out: |
|
free(debugfile); |
|
return realname; |
|
} |
|
|
|
int |
|
build_id_cache__add(const char *sbuild_id, const char *name, const char *realname, |
|
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) |
|
{ |
|
const size_t size = PATH_MAX; |
|
char *filename = NULL, *dir_name = NULL, *linkname = zalloc(size), *tmp; |
|
char *debugfile = NULL; |
|
int err = -1; |
|
|
|
dir_name = build_id_cache__cachedir(sbuild_id, name, nsi, is_kallsyms, |
|
is_vdso); |
|
if (!dir_name) |
|
goto out_free; |
|
|
|
/* Remove old style build-id cache */ |
|
if (is_regular_file(dir_name)) |
|
if (unlink(dir_name)) |
|
goto out_free; |
|
|
|
if (mkdir_p(dir_name, 0755)) |
|
goto out_free; |
|
|
|
/* Save the allocated buildid dirname */ |
|
if (asprintf(&filename, "%s/%s", dir_name, |
|
build_id_cache__basename(is_kallsyms, is_vdso, |
|
false)) < 0) { |
|
filename = NULL; |
|
goto out_free; |
|
} |
|
|
|
if (access(filename, F_OK)) { |
|
if (is_kallsyms) { |
|
if (copyfile("/proc/kallsyms", filename)) |
|
goto out_free; |
|
} else if (nsi && nsi->need_setns) { |
|
if (copyfile_ns(name, filename, nsi)) |
|
goto out_free; |
|
} else if (link(realname, filename) && errno != EEXIST && |
|
copyfile(name, filename)) |
|
goto out_free; |
|
} |
|
|
|
/* Some binaries are stripped, but have .debug files with their symbol |
|
* table. Check to see if we can locate one of those, since the elf |
|
* file itself may not be very useful to users of our tools without a |
|
* symtab. |
|
*/ |
|
if (!is_kallsyms && !is_vdso && |
|
strncmp(".ko", name + strlen(name) - 3, 3)) { |
|
debugfile = build_id_cache__find_debug(sbuild_id, nsi); |
|
if (debugfile) { |
|
zfree(&filename); |
|
if (asprintf(&filename, "%s/%s", dir_name, |
|
build_id_cache__basename(false, false, true)) < 0) { |
|
filename = NULL; |
|
goto out_free; |
|
} |
|
if (access(filename, F_OK)) { |
|
if (nsi && nsi->need_setns) { |
|
if (copyfile_ns(debugfile, filename, |
|
nsi)) |
|
goto out_free; |
|
} else if (link(debugfile, filename) && |
|
errno != EEXIST && |
|
copyfile(debugfile, filename)) |
|
goto out_free; |
|
} |
|
} |
|
} |
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
|
goto out_free; |
|
tmp = strrchr(linkname, '/'); |
|
*tmp = '\0'; |
|
|
|
if (access(linkname, X_OK) && mkdir_p(linkname, 0755)) |
|
goto out_free; |
|
|
|
*tmp = '/'; |
|
tmp = dir_name + strlen(buildid_dir) - 5; |
|
memcpy(tmp, "../..", 5); |
|
|
|
if (symlink(tmp, linkname) == 0) { |
|
err = 0; |
|
} else if (errno == EEXIST) { |
|
char path[PATH_MAX]; |
|
ssize_t len; |
|
|
|
len = readlink(linkname, path, sizeof(path) - 1); |
|
if (len <= 0) { |
|
pr_err("Cant read link: %s\n", linkname); |
|
goto out_free; |
|
} |
|
path[len] = '\0'; |
|
|
|
if (strcmp(tmp, path)) { |
|
pr_debug("build <%s> already linked to %s\n", |
|
sbuild_id, linkname); |
|
} |
|
err = 0; |
|
} |
|
|
|
/* Update SDT cache : error is just warned */ |
|
if (realname && |
|
build_id_cache__add_sdt_cache(sbuild_id, realname, nsi) < 0) |
|
pr_debug4("Failed to update/scan SDT cache for %s\n", realname); |
|
|
|
out_free: |
|
free(filename); |
|
free(debugfile); |
|
free(dir_name); |
|
free(linkname); |
|
return err; |
|
} |
|
|
|
int build_id_cache__add_s(const char *sbuild_id, const char *name, |
|
struct nsinfo *nsi, bool is_kallsyms, bool is_vdso) |
|
{ |
|
char *realname = NULL; |
|
int err = -1; |
|
|
|
if (!is_kallsyms) { |
|
if (!is_vdso) |
|
realname = nsinfo__realpath(name, nsi); |
|
else |
|
realname = realpath(name, NULL); |
|
if (!realname) |
|
goto out_free; |
|
} |
|
|
|
err = build_id_cache__add(sbuild_id, name, realname, nsi, is_kallsyms, is_vdso); |
|
|
|
out_free: |
|
if (!is_kallsyms) |
|
free(realname); |
|
return err; |
|
} |
|
|
|
static int build_id_cache__add_b(const struct build_id *bid, |
|
const char *name, struct nsinfo *nsi, |
|
bool is_kallsyms, bool is_vdso) |
|
{ |
|
char sbuild_id[SBUILD_ID_SIZE]; |
|
|
|
build_id__sprintf(bid, sbuild_id); |
|
|
|
return build_id_cache__add_s(sbuild_id, name, nsi, is_kallsyms, |
|
is_vdso); |
|
} |
|
|
|
bool build_id_cache__cached(const char *sbuild_id) |
|
{ |
|
bool ret = false; |
|
char *filename = build_id_cache__linkname(sbuild_id, NULL, 0); |
|
|
|
if (filename && !access(filename, F_OK)) |
|
ret = true; |
|
free(filename); |
|
|
|
return ret; |
|
} |
|
|
|
int build_id_cache__remove_s(const char *sbuild_id) |
|
{ |
|
const size_t size = PATH_MAX; |
|
char *filename = zalloc(size), |
|
*linkname = zalloc(size), *tmp; |
|
int err = -1; |
|
|
|
if (filename == NULL || linkname == NULL) |
|
goto out_free; |
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size)) |
|
goto out_free; |
|
|
|
if (access(linkname, F_OK)) |
|
goto out_free; |
|
|
|
if (readlink(linkname, filename, size - 1) < 0) |
|
goto out_free; |
|
|
|
if (unlink(linkname)) |
|
goto out_free; |
|
|
|
/* |
|
* Since the link is relative, we must make it absolute: |
|
*/ |
|
tmp = strrchr(linkname, '/') + 1; |
|
snprintf(tmp, size - (tmp - linkname), "%s", filename); |
|
|
|
if (rm_rf(linkname)) |
|
goto out_free; |
|
|
|
err = 0; |
|
out_free: |
|
free(filename); |
|
free(linkname); |
|
return err; |
|
} |
|
|
|
static int dso__cache_build_id(struct dso *dso, struct machine *machine, |
|
void *priv __maybe_unused) |
|
{ |
|
bool is_kallsyms = dso__is_kallsyms(dso); |
|
bool is_vdso = dso__is_vdso(dso); |
|
const char *name = dso->long_name; |
|
|
|
if (!dso->has_build_id) |
|
return 0; |
|
|
|
if (dso__is_kcore(dso)) { |
|
is_kallsyms = true; |
|
name = machine->mmap_name; |
|
} |
|
return build_id_cache__add_b(&dso->bid, name, dso->nsinfo, |
|
is_kallsyms, is_vdso); |
|
} |
|
|
|
static int |
|
machines__for_each_dso(struct machines *machines, machine__dso_t fn, void *priv) |
|
{ |
|
int ret = machine__for_each_dso(&machines->host, fn, priv); |
|
struct rb_node *nd; |
|
|
|
for (nd = rb_first_cached(&machines->guests); nd; |
|
nd = rb_next(nd)) { |
|
struct machine *pos = rb_entry(nd, struct machine, rb_node); |
|
|
|
ret |= machine__for_each_dso(pos, fn, priv); |
|
} |
|
return ret ? -1 : 0; |
|
} |
|
|
|
int __perf_session__cache_build_ids(struct perf_session *session, |
|
machine__dso_t fn, void *priv) |
|
{ |
|
if (no_buildid_cache) |
|
return 0; |
|
|
|
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST) |
|
return -1; |
|
|
|
return machines__for_each_dso(&session->machines, fn, priv) ? -1 : 0; |
|
} |
|
|
|
int perf_session__cache_build_ids(struct perf_session *session) |
|
{ |
|
return __perf_session__cache_build_ids(session, dso__cache_build_id, NULL); |
|
} |
|
|
|
static bool machine__read_build_ids(struct machine *machine, bool with_hits) |
|
{ |
|
return __dsos__read_build_ids(&machine->dsos.head, with_hits); |
|
} |
|
|
|
bool perf_session__read_build_ids(struct perf_session *session, bool with_hits) |
|
{ |
|
struct rb_node *nd; |
|
bool ret = machine__read_build_ids(&session->machines.host, with_hits); |
|
|
|
for (nd = rb_first_cached(&session->machines.guests); nd; |
|
nd = rb_next(nd)) { |
|
struct machine *pos = rb_entry(nd, struct machine, rb_node); |
|
ret |= machine__read_build_ids(pos, with_hits); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
void build_id__init(struct build_id *bid, const u8 *data, size_t size) |
|
{ |
|
WARN_ON(size > BUILD_ID_SIZE); |
|
memcpy(bid->data, data, size); |
|
bid->size = size; |
|
} |
|
|
|
bool build_id__is_defined(const struct build_id *bid) |
|
{ |
|
return bid && bid->size ? !!memchr_inv(bid->data, 0, bid->size) : false; |
|
}
|
|
|