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 struct symbol *symbol = machine__find_kernel_symbol_by_name(machine, argv[i], &map);
32
33 if (symbol == NULL) {
34 printf("%s: not found\n", argv[i]);
35 continue;
36 }
37
38 printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
39 symbol->name, map->dso->short_name, map->dso->long_name,
40 map->unmap_ip(map, symbol->start), map->unmap_ip(map, symbol->end),
41 symbol->start, symbol->end);
42 }
43
44 machine__delete(machine);
45 return 0;
46 }
47
cmd_kallsyms(int argc,const char ** argv)48 int cmd_kallsyms(int argc, const char **argv)
49 {
50 const struct option options[] = {
51 OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
52 OPT_END()
53 };
54 const char * const kallsyms_usage[] = {
55 "perf kallsyms [<options>] symbol_name",
56 NULL
57 };
58
59 argc = parse_options(argc, argv, options, kallsyms_usage, 0);
60 if (argc < 1)
61 usage_with_options(kallsyms_usage, options);
62
63 symbol_conf.sort_by_name = true;
64 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
65 if (symbol__init(NULL) < 0)
66 return -1;
67
68 return __cmd_kallsyms(argc, argv);
69 }
70