1 /*
2 * builtin-kallsyms.c
3 *
4 * Builtin command: Look for a symbol in the running kernel and its modules
5 *
6 * Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
7 *
8 * Released under the GPL v2. (and only v2, not any later version)
9 */
10 #include <inttypes.h>
11 #include "builtin.h"
12 #include <linux/compiler.h>
13 #include <subcmd/parse-options.h>
14 #include "debug.h"
15 #include "machine.h"
16 #include "symbol.h"
17
__cmd_kallsyms(int argc,const char ** argv)18 static int __cmd_kallsyms(int argc, const char **argv)
19 {
20 int i;
21 struct machine *machine = machine__new_kallsyms();
22
23 if (machine == NULL) {
24 pr_err("Couldn't read /proc/kallsyms\n");
25 return -1;
26 }
27
28 for (i = 0; i < argc; ++i) {
29 struct map *map;
30 struct symbol *symbol = machine__find_kernel_symbol_by_name(machine, argv[i], &map);
31
32 if (symbol == NULL) {
33 printf("%s: not found\n", argv[i]);
34 continue;
35 }
36
37 printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
38 symbol->name, map->dso->short_name, map->dso->long_name,
39 map->unmap_ip(map, symbol->start), map->unmap_ip(map, symbol->end),
40 symbol->start, symbol->end);
41 }
42
43 machine__delete(machine);
44 return 0;
45 }
46
cmd_kallsyms(int argc,const char ** argv)47 int cmd_kallsyms(int argc, const char **argv)
48 {
49 const struct option options[] = {
50 OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
51 OPT_END()
52 };
53 const char * const kallsyms_usage[] = {
54 "perf kallsyms [<options>] symbol_name",
55 NULL
56 };
57
58 argc = parse_options(argc, argv, options, kallsyms_usage, 0);
59 if (argc < 1)
60 usage_with_options(kallsyms_usage, options);
61
62 symbol_conf.sort_by_name = true;
63 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
64 if (symbol__init(NULL) < 0)
65 return -1;
66
67 return __cmd_kallsyms(argc, argv);
68 }
69
