1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * builtin-kallsyms.c
4 *
5 * Builtin command: Look for a symbol in the running kernel and its modules
6 *
7 * Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
8 */
9 #include <inttypes.h>
10 #include "builtin.h"
11 #include <linux/compiler.h>
12 #include <subcmd/parse-options.h>
13 #include "debug.h"
14 #include "dso.h"
15 #include "machine.h"
16 #include "map.h"
17 #include "symbol.h"
18
__cmd_kallsyms(int argc,const char ** argv)19 static int __cmd_kallsyms(int argc, const char **argv)
20 {
21 int i;
22 struct machine *machine = machine__new_kallsyms();
23
24 if (machine == NULL) {
25 pr_err("Couldn't read /proc/kallsyms\n");
26 return -1;
27 }
28
29 for (i = 0; i < argc; ++i) {
30 struct map *map;
31 const struct dso *dso;
32 struct symbol *symbol = machine__find_kernel_symbol_by_name(machine, argv[i], &map);
33
34 if (symbol == NULL) {
35 printf("%s: not found\n", argv[i]);
36 continue;
37 }
38
39 dso = map__dso(map);
40 printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
41 symbol->name, dso->short_name, dso->long_name,
42 map__unmap_ip(map, symbol->start), map__unmap_ip(map, symbol->end),
43 symbol->start, symbol->end);
44 }
45
46 machine__delete(machine);
47 return 0;
48 }
49
cmd_kallsyms(int argc,const char ** argv)50 int cmd_kallsyms(int argc, const char **argv)
51 {
52 const struct option options[] = {
53 OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
54 OPT_END()
55 };
56 const char * const kallsyms_usage[] = {
57 "perf kallsyms [<options>] symbol_name",
58 NULL
59 };
60
61 argc = parse_options(argc, argv, options, kallsyms_usage, 0);
62 if (argc < 1)
63 usage_with_options(kallsyms_usage, options);
64
65 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
66 if (symbol__init(NULL) < 0)
67 return -1;
68
69 return __cmd_kallsyms(argc, argv);
70 }
71