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 "machine.h"
  15#include "map.h"
  16#include "symbol.h"
  17
  18static int __cmd_kallsyms(int argc, const char **argv)
  19{
  20        int i;
  21        struct machine *machine = machine__new_kallsyms();
  22
  23        if (machine == NULL) {
  24                pr_err("Couldn't read /proc/kallsyms\n");
  25                return -1;
  26        }
  27
  28        for (i = 0; i < argc; ++i) {
  29                struct map *map;
  30                struct symbol *symbol = machine__find_kernel_symbol_by_name(machine, argv[i], &map);
  31
  32                if (symbol == NULL) {
  33                        printf("%s: not found\n", argv[i]);
  34                        continue;
  35                }
  36
  37                printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n",
  38                        symbol->name, map->dso->short_name, map->dso->long_name,
  39                        map->unmap_ip(map, symbol->start), map->unmap_ip(map, symbol->end),
  40                        symbol->start, symbol->end);
  41        }
  42
  43        machine__delete(machine);
  44        return 0;
  45}
  46
  47int cmd_kallsyms(int argc, const char **argv)
  48{
  49        const struct option options[] = {
  50        OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"),
  51        OPT_END()
  52        };
  53        const char * const kallsyms_usage[] = {
  54                "perf kallsyms [<options>] symbol_name",
  55                NULL
  56        };
  57
  58        argc = parse_options(argc, argv, options, kallsyms_usage, 0);
  59        if (argc < 1)
  60                usage_with_options(kallsyms_usage, options);
  61
  62        symbol_conf.sort_by_name = true;
  63        symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
  64        if (symbol__init(NULL) < 0)
  65                return -1;
  66
  67        return __cmd_kallsyms(argc, argv);
  68}
  69