xref: /openbmc/linux/tools/perf/util/build-id.c (revision b34e08d5)
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,
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 }
109