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1c1a3a4729
That is not present on some libelf implementations, such as the one used in Alpine Linux: libelf-0.8.13. This ends up disabling the SDT code, that relies on this function. One alternative would be to provide an weak fallback implementation or the open coded variant used by the buildid sysfs notes reading code. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-82lh22ybedy9b9lych8xj12g@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
763 lines
17 KiB
C
763 lines
17 KiB
C
/*
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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 <acme@redhat.com>
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*/
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#include "util.h"
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#include <stdio.h>
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#include "build-id.h"
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#include "event.h"
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#include "symbol.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 "probe-file.h"
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static bool no_buildid_cache;
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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 perf_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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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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thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al);
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if (al.map != NULL)
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al.map->dso->hit = 1;
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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 u8 *build_id, int len, char *bf)
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{
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char *bid = bf;
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const u8 *raw = build_id;
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int i;
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for (i = 0; i < len; ++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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u8 build_id[BUILD_ID_SIZE];
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int ret;
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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, build_id, sizeof(build_id));
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if (ret < 0)
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return ret;
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return build_id__sprintf(build_id, sizeof(build_id), 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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u8 build_id[BUILD_ID_SIZE];
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int ret;
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ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
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if (ret < 0)
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return ret;
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else if (ret != sizeof(build_id))
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return -EINVAL;
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return build_id__sprintf(build_id, sizeof(build_id), 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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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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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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if (readlink(linkname, buf, PATH_MAX) < 0)
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goto out;
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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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static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
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{
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return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "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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{
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bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
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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->build_id, sizeof(dso->build_id), 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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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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bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size)
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{
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char *id_name = NULL, *ch;
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struct stat sb;
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char sbuild_id[SBUILD_ID_SIZE];
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if (!dso->has_build_id)
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goto err;
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build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
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id_name = build_id_cache__linkname(sbuild_id, NULL, 0);
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if (!id_name)
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goto err;
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if (access(id_name, F_OK))
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goto err;
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if (lstat(id_name, &sb) == -1)
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goto err;
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if ((size_t)sb.st_size > size - 1)
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goto err;
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if (readlink(id_name, bf, size - 1) < 0)
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goto err;
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bf[sb.st_size] = '\0';
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/*
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* link should be:
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* ../../lib/modules/4.4.0-rc4/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko/a09fe3eb3147dafa4e3b31dbd6257e4d696bdc92
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*/
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ch = strrchr(bf, '/');
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if (!ch)
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goto err;
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if (ch - 3 < bf)
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goto err;
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free(id_name);
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return strncmp(".ko", ch - 3, 3) == 0;
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err:
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pr_err("Invalid build id: %s\n", id_name ? :
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dso->long_name ? :
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dso->short_name ? :
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"[unknown]");
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free(id_name);
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return false;
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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, u8 *build_id,
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pid_t pid, u16 misc, int fd)
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{
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int err;
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struct build_id_event 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.build_id, build_id, 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 = writen(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, int fd)
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{
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int err = 0;
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char nm[PATH_MAX];
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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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machine__mmap_name(machine, nm, sizeof(nm));
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name = nm;
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name_len = strlen(nm);
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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->build_id, 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, int 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(&session->machines.guests); nd; 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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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(&session->machines.guests); nd; 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 __maybe_unused)
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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 __maybe_unused)
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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_SIZE - 3) && (d->d_name[i] == '\0');
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}
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struct strlist *build_id_cache__list_all(void)
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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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/* 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 (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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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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char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
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bool is_kallsyms, 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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if (!slash) {
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realname = realpath(name, NULL);
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if (!realname)
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return NULL;
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}
|
|
|
|
if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
|
|
is_vdso ? DSO__NAME_VDSO : realname,
|
|
sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
|
|
filename = NULL;
|
|
|
|
if (!slash)
|
|
free(realname);
|
|
|
|
return filename;
|
|
}
|
|
|
|
int build_id_cache__list_build_ids(const char *pathname,
|
|
struct strlist **result)
|
|
{
|
|
char *dir_name;
|
|
int ret = 0;
|
|
|
|
dir_name = build_id_cache__cachedir(NULL, pathname, false, false);
|
|
if (!dir_name)
|
|
return -ENOMEM;
|
|
|
|
*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 probe_cache *cache;
|
|
int ret;
|
|
|
|
cache = probe_cache__new(sbuild_id);
|
|
if (!cache)
|
|
return -1;
|
|
|
|
ret = probe_cache__scan_sdt(cache, realname);
|
|
if (ret >= 0) {
|
|
pr_debug("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) (0)
|
|
#endif
|
|
|
|
int build_id_cache__add_s(const char *sbuild_id, const char *name,
|
|
bool is_kallsyms, bool is_vdso)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *realname = NULL, *filename = NULL, *dir_name = NULL,
|
|
*linkname = zalloc(size), *tmp;
|
|
int err = -1;
|
|
|
|
if (!is_kallsyms) {
|
|
realname = realpath(name, NULL);
|
|
if (!realname)
|
|
goto out_free;
|
|
}
|
|
|
|
dir_name = build_id_cache__cachedir(sbuild_id, name,
|
|
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)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
if (access(filename, F_OK)) {
|
|
if (is_kallsyms) {
|
|
if (copyfile("/proc/kallsyms", filename))
|
|
goto out_free;
|
|
} else if (link(realname, filename) && errno != EEXIST &&
|
|
copyfile(name, 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;
|
|
|
|
/* Update SDT cache : error is just warned */
|
|
if (build_id_cache__add_sdt_cache(sbuild_id, realname) < 0)
|
|
pr_debug("Failed to update/scan SDT cache for %s\n", realname);
|
|
|
|
out_free:
|
|
if (!is_kallsyms)
|
|
free(realname);
|
|
free(filename);
|
|
free(dir_name);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
|
|
const char *name, bool is_kallsyms,
|
|
bool is_vdso)
|
|
{
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
build_id__sprintf(build_id, build_id_size, sbuild_id);
|
|
|
|
return build_id_cache__add_s(sbuild_id, name, 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)
|
|
{
|
|
bool is_kallsyms = dso__is_kallsyms(dso);
|
|
bool is_vdso = dso__is_vdso(dso);
|
|
const char *name = dso->long_name;
|
|
char nm[PATH_MAX];
|
|
|
|
if (dso__is_kcore(dso)) {
|
|
is_kallsyms = true;
|
|
machine__mmap_name(machine, nm, sizeof(nm));
|
|
name = nm;
|
|
}
|
|
return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
|
|
is_kallsyms, is_vdso);
|
|
}
|
|
|
|
static int __dsos__cache_build_ids(struct list_head *head,
|
|
struct machine *machine)
|
|
{
|
|
struct dso *pos;
|
|
int err = 0;
|
|
|
|
dsos__for_each_with_build_id(pos, head)
|
|
if (dso__cache_build_id(pos, machine))
|
|
err = -1;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int machine__cache_build_ids(struct machine *machine)
|
|
{
|
|
return __dsos__cache_build_ids(&machine->dsos.head, machine);
|
|
}
|
|
|
|
int perf_session__cache_build_ids(struct perf_session *session)
|
|
{
|
|
struct rb_node *nd;
|
|
int ret;
|
|
|
|
if (no_buildid_cache)
|
|
return 0;
|
|
|
|
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
|
|
return -1;
|
|
|
|
ret = machine__cache_build_ids(&session->machines.host);
|
|
|
|
for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
ret |= machine__cache_build_ids(pos);
|
|
}
|
|
return ret ? -1 : 0;
|
|
}
|
|
|
|
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(&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;
|
|
}
|