c08ee81529e8afeb9bea4e07763ddde1c53f3570
[releases.git] / builtin-kallsyms.c
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
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
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 }