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
18static 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_function_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
47int 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}