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 } 71