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 "env.h" 16 #include "machine.h" 17 #include "map.h" 18 #include "symbol.h" 19 20 static int __cmd_kallsyms(int argc, const char **argv) 21 { 22 int i, err; 23 struct perf_env host_env; 24 struct machine *machine = NULL; 25 26 27 perf_env__init(&host_env); 28 err = perf_env__set_cmdline(&host_env, argc, argv); 29 if (err) 30 goto out; 31 32 machine = machine__new_kallsyms(&host_env); 33 if (machine == NULL) { 34 pr_err("Couldn't read /proc/kallsyms\n"); 35 err = -1; 36 goto out; 37 } 38 39 for (i = 0; i < argc; ++i) { 40 struct map *map; 41 const struct dso *dso; 42 struct symbol *symbol = machine__find_kernel_symbol_by_name(machine, argv[i], &map); 43 44 if (symbol == NULL) { 45 printf("%s: not found\n", argv[i]); 46 continue; 47 } 48 49 dso = map__dso(map); 50 printf("%s: %s %s %#" PRIx64 "-%#" PRIx64 " (%#" PRIx64 "-%#" PRIx64")\n", 51 symbol->name, dso__short_name(dso), dso__long_name(dso), 52 map__unmap_ip(map, symbol->start), map__unmap_ip(map, symbol->end), 53 symbol->start, symbol->end); 54 } 55 out: 56 machine__delete(machine); 57 perf_env__exit(&host_env); 58 return err; 59 } 60 61 int cmd_kallsyms(int argc, const char **argv) 62 { 63 const struct option options[] = { 64 OPT_INCR('v', "verbose", &verbose, "be more verbose (show counter open errors, etc)"), 65 OPT_END() 66 }; 67 const char * const kallsyms_usage[] = { 68 "perf kallsyms [<options>] symbol_name", 69 NULL 70 }; 71 72 argc = parse_options(argc, argv, options, kallsyms_usage, 0); 73 if (argc < 1) 74 usage_with_options(kallsyms_usage, options); 75 76 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL); 77 if (symbol__init(NULL) < 0) 78 return -1; 79 80 return __cmd_kallsyms(argc, argv); 81 } 82