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