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35563771 ACM |
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 "builtin.h" | |
11 | #include <linux/compiler.h> | |
12 | #include <subcmd/parse-options.h> | |
13 | #include "debug.h" | |
14 | #include "machine.h" | |
15 | #include "symbol.h" | |
16 | ||
17 | static int __cmd_kallsyms(int argc, const char **argv) | |
18 | { | |
19 | int i; | |
20 | struct machine *machine = machine__new_kallsyms(); | |
21 | ||
22 | if (machine == NULL) { | |
23 | pr_err("Couldn't read /proc/kallsyms\n"); | |
24 | return -1; | |
25 | } | |
26 | ||
27 | for (i = 0; i < argc; ++i) { | |
28 | struct map *map; | |
29 | struct symbol *symbol = machine__find_kernel_function_by_name(machine, argv[i], &map); | |
30 | ||
31 | if (symbol == NULL) { | |
32 | printf("%s: not found\n", argv[i]); | |
33 | continue; | |
34 | } | |
35 | ||
36 | printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n", | |
37 | symbol->name, map->dso->short_name, map->dso->long_name, | |
38 | map->unmap_ip(map, symbol->start), map->unmap_ip(map, symbol->end), | |
39 | symbol->start, symbol->end); | |
40 | } | |
41 | ||
42 | machine__delete(machine); | |
43 | return 0; | |
44 | } | |
45 | ||
46 | int cmd_kallsyms(int argc, const char **argv, const char *prefix __maybe_unused) | |
47 | { | |
48 | const struct option options[] = { | |
49 | OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"), | |
50 | OPT_END() | |
51 | }; | |
52 | const char * const kallsyms_usage[] = { | |
53 | "perf kallsyms [<options>] symbol_name", | |
54 | NULL | |
55 | }; | |
56 | ||
57 | argc = parse_options(argc, argv, options, kallsyms_usage, 0); | |
58 | if (argc < 1) | |
59 | usage_with_options(kallsyms_usage, options); | |
60 | ||
61 | symbol_conf.sort_by_name = true; | |
62 | symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL); | |
63 | if (symbol__init(NULL) < 0) | |
64 | return -1; | |
65 | ||
66 | return __cmd_kallsyms(argc, argv); | |
67 | } |