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