build-id.c revision e6817ec1d8ab31fc7b01906e305f848542df6413 
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
17static int build_id__mark_dso_hit(union perf_event *event,
18				  struct perf_sample *sample __used,
19				  struct perf_evsel *evsel __used,
20				  struct perf_session *session)
21{
22	struct addr_location al;
23	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
24	struct thread *thread = perf_session__findnew(session, event->ip.pid);
25
26	if (thread == NULL) {
27		pr_err("problem processing %d event, skipping it.\n",
28			event->header.type);
29		return -1;
30	}
31
32	thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
33			      event->ip.pid, event->ip.ip, &al);
34
35	if (al.map != NULL)
36		al.map->dso->hit = 1;
37
38	return 0;
39}
40
41static int perf_event__exit_del_thread(union perf_event *event,
42				       struct perf_sample *sample __used,
43				       struct perf_session *session)
44{
45	struct thread *thread = perf_session__findnew(session, event->fork.tid);
46
47	dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
48		    event->fork.ppid, event->fork.ptid);
49
50	if (thread) {
51		rb_erase(&thread->rb_node, &session->threads);
52		session->last_match = NULL;
53		thread__delete(thread);
54	}
55
56	return 0;
57}
58
59struct perf_event_ops build_id__mark_dso_hit_ops = {
60	.sample	= build_id__mark_dso_hit,
61	.mmap	= perf_event__process_mmap,
62	.fork	= perf_event__process_task,
63	.exit	= perf_event__exit_del_thread,
64};
65
66char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
67{
68	char build_id_hex[BUILD_ID_SIZE * 2 + 1];
69
70	if (!self->has_build_id)
71		return NULL;
72
73	build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
74	if (bf == NULL) {
75		if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
76			     build_id_hex, build_id_hex + 2) < 0)
77			return NULL;
78	} else
79		snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
80			 build_id_hex, build_id_hex + 2);
81	return bf;
82}
83