tools/perf/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                 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
  50 int 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 }