tools/perf/util/build-id.c

   1 /*
   2  * build-id.c
   3  *
   4  * build-id support
   5  *
   6  * Copyright (C) 2009, 2010 Red Hat Inc.
   7  * Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
   8  */
   9 #include "util.h"
  10 #include <stdio.h>
  11 #include "build-id.h"
  12 #include "event.h"
  13 #include "symbol.h"
  14 #include <linux/kernel.h>
  15
  16 static int build_id__mark_dso_hit(event_t *event, struct perf_session *session)
  17 {
  18         struct addr_location al;
  19         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  20         struct thread *thread = perf_session__findnew(session, event->ip.pid);
  21
  22         if (thread == NULL) {
  23                 pr_err("problem processing %d event, skipping it.\n",
  24                         event->header.type);
  25                 return -1;
  26         }
  27
  28         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
  29                               event->ip.pid, event->ip.ip, &al);
  30
  31         if (al.map != NULL)
  32                 al.map->dso->hit = 1;
  33
  34         return 0;
  35 }
  36
  37 struct perf_event_ops build_id__mark_dso_hit_ops = {
  38         .sample = build_id__mark_dso_hit,
  39         .mmap   = event__process_mmap,
  40         .fork   = event__process_task,
  41 };
  42
  43 char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
  44 {
  45         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
  46         const char *home;
  47
  48         if (!self->has_build_id)
  49                 return NULL;
  50
  51         build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
  52         home = getenv("HOME");
  53         if (bf == NULL) {
  54                 if (asprintf(&bf, "%s/%s/.build-id/%.2s/%s", home,
  55                              DEBUG_CACHE_DIR, build_id_hex, build_id_hex + 2) < 0)
  56                         return NULL;
  57         } else
  58                 snprintf(bf, size, "%s/%s/.build-id/%.2s/%s", home,
  59                          DEBUG_CACHE_DIR, build_id_hex, build_id_hex + 2);
  60         return bf;
  61 }