builtin-kallsyms.c

   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
  19 static 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
  48 int 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 }