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
19static 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
48int 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}