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		const struct dso *dso;
32		struct symbol *symbol = machine__find_kernel_symbol_by_name(machine, argv[i], &map);
33
34		if (symbol == NULL) {
35			printf("%s: not found\n", argv[i]);
36			continue;
37		}
38
39		dso = map__dso(map);
40		printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
41			symbol->name, dso->short_name, dso->long_name,
42			map__unmap_ip(map, symbol->start), map__unmap_ip(map, symbol->end),
43			symbol->start, symbol->end);
44	}
45
46	machine__delete(machine);
47	return 0;
48}
49
50int cmd_kallsyms(int argc, const char **argv)
51{
52	const struct option options[] = {
53	OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
54	OPT_END()
55	};
56	const char * const kallsyms_usage[] = {
57		"perf kallsyms [<options>] symbol_name",
58		NULL
59	};
60
61	argc = parse_options(argc, argv, options, kallsyms_usage, 0);
62	if (argc < 1)
63		usage_with_options(kallsyms_usage, options);
64
65	symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
66	if (symbol__init(NULL) < 0)
67		return -1;
68
69	return __cmd_kallsyms(argc, argv);
70}
71