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 <[email protected]>
   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 #include "debug.h"
  16 #include "session.h"
  17 #include "tool.h"
  18
  19 int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
  20                            union perf_event *event,
  21                            struct perf_sample *sample,
  22                            struct perf_evsel *evsel __maybe_unused,
  23                            struct machine *machine)
  24 {
  25         struct addr_location al;
  26         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
  27         struct thread *thread = machine__findnew_thread(machine, sample->pid,
  28                                                         sample->pid);
  29
  30         if (thread == NULL) {
  31                 pr_err("problem processing %d event, skipping it.\n",
  32                         event->header.type);
  33                 return -1;
  34         }
  35
  36         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
  37                               sample->ip, &al);
  38
  39         if (al.map != NULL)
  40                 al.map->dso->hit = 1;
  41
  42         return 0;
  43 }
  44
  45 static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
  46                                        union perf_event *event,
  47                                        struct perf_sample *sample
  48                                        __maybe_unused,
  49                                        struct machine *machine)
  50 {
  51         struct thread *thread = machine__findnew_thread(machine,
  52                                                         event->fork.pid,
  53                                                         event->fork.tid);
  54
  55         dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
  56                     event->fork.ppid, event->fork.ptid);
  57
  58         if (thread) {
  59                 rb_erase(&thread->rb_node, &machine->threads);
  60                 machine->last_match = NULL;
  61                 thread__delete(thread);
  62         }
  63
  64         return 0;
  65 }
  66
  67 struct perf_tool build_id__mark_dso_hit_ops = {
  68         .sample = build_id__mark_dso_hit,
  69         .mmap   = perf_event__process_mmap,
  70         .mmap2  = perf_event__process_mmap2,
  71         .fork   = perf_event__process_fork,
  72         .exit   = perf_event__exit_del_thread,
  73         .attr            = perf_event__process_attr,
  74         .build_id        = perf_event__process_build_id,
  75 };
  76
  77 int build_id__sprintf(const u8 *build_id, int len, char *bf)
  78 {
  79         char *bid = bf;
  80         const u8 *raw = build_id;
  81         int i;
  82
  83         for (i = 0; i < len; ++i) {
  84                 sprintf(bid, "%02x", *raw);
  85                 ++raw;
  86                 bid += 2;
  87         }
  88
  89         return raw - build_id;
  90 }
  91
  92 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
  93 {
  94         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
  95
  96         if (!dso->has_build_id)
  97                 return NULL;
  98
  99         build_id__sprintf(dso->build_id, sizeof(dso->build_id), build_id_hex);
 100         if (bf == NULL) {
 101                 if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
 102                              build_id_hex, build_id_hex + 2) < 0)
 103                         return NULL;
 104         } else
 105                 snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
 106                          build_id_hex, build_id_hex + 2);
 107         return bf;
 108 }