tools/perf/builtin-kallsyms.c

   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 }