71 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * builtin-kallsyms.c4 *5 * Builtin command: Look for a symbol in the running kernel and its modules6 *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 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), dso__long_name(dso),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 50int 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 NULL59 };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}71