LXR linux/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
  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                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
  48int 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}
  70