1 /*
2  * builtin-buildid-list.c
3  *
4  * Builtin buildid-list command: list buildids in perf.data, in the running
5  * kernel and in ELF files.
6  *
7  * Copyright (C) 2009, Red Hat Inc.
8  * Copyright (C) 2009, Arnaldo Carvalho de Melo <acme@redhat.com>
9  */
10 #include "builtin.h"
11 #include "perf.h"
12 #include "util/build-id.h"
13 #include "util/cache.h"
14 #include "util/debug.h"
15 #include "util/parse-options.h"
16 #include "util/session.h"
17 #include "util/symbol.h"
18 
19 #include <libelf.h>
20 
21 static const char *input_name;
22 static bool force;
23 static bool show_kernel;
24 static bool with_hits;
25 
26 static const char * const buildid_list_usage[] = {
27 	"perf buildid-list [<options>]",
28 	NULL
29 };
30 
31 static const struct option options[] = {
32 	OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
33 	OPT_STRING('i', "input", &input_name, "file",
34 		    "input file name"),
35 	OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
36 	OPT_BOOLEAN('k', "kernel", &show_kernel, "Show current kernel build id"),
37 	OPT_INCR('v', "verbose", &verbose,
38 		    "be more verbose"),
39 	OPT_END()
40 };
41 
42 static int sysfs__fprintf_build_id(FILE *fp)
43 {
44 	u8 kallsyms_build_id[BUILD_ID_SIZE];
45 	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
46 
47 	if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
48 				 sizeof(kallsyms_build_id)) != 0)
49 		return -1;
50 
51 	build_id__sprintf(kallsyms_build_id, sizeof(kallsyms_build_id),
52 			  sbuild_id);
53 	fprintf(fp, "%s\n", sbuild_id);
54 	return 0;
55 }
56 
57 static int filename__fprintf_build_id(const char *name, FILE *fp)
58 {
59 	u8 build_id[BUILD_ID_SIZE];
60 	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
61 
62 	if (filename__read_build_id(name, build_id,
63 				    sizeof(build_id)) != sizeof(build_id))
64 		return 0;
65 
66 	build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
67 	return fprintf(fp, "%s\n", sbuild_id);
68 }
69 
70 static int perf_session__list_build_ids(void)
71 {
72 	struct perf_session *session;
73 
74 	elf_version(EV_CURRENT);
75 
76 	session = perf_session__new(input_name, O_RDONLY, force, false,
77 				    &build_id__mark_dso_hit_ops);
78 	if (session == NULL)
79 		return -1;
80 
81 	/*
82 	 * See if this is an ELF file first:
83 	 */
84 	if (filename__fprintf_build_id(session->filename, stdout))
85 		goto out;
86 
87 	/*
88 	 * in pipe-mode, the only way to get the buildids is to parse
89 	 * the record stream. Buildids are stored as RECORD_HEADER_BUILD_ID
90 	 */
91 	if (with_hits || session->fd_pipe)
92 		perf_session__process_events(session, &build_id__mark_dso_hit_ops);
93 
94 	perf_session__fprintf_dsos_buildid(session, stdout, with_hits);
95 out:
96 	perf_session__delete(session);
97 	return 0;
98 }
99 
100 static int __cmd_buildid_list(void)
101 {
102 	if (show_kernel)
103 		return sysfs__fprintf_build_id(stdout);
104 
105 	return perf_session__list_build_ids();
106 }
107 
108 int cmd_buildid_list(int argc, const char **argv, const char *prefix __used)
109 {
110 	argc = parse_options(argc, argv, options, buildid_list_usage, 0);
111 	setup_pager();
112 	return __cmd_buildid_list();
113 }
114