1 /* 2 * builtin-kallsyms.c 3 * 4 * Builtin command: Look for a symbol in the running kernel and its modules 5 * 6 * Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> 7 * 8 * Released under the GPL v2. (and only v2, not any later version) 9 */ 10 #include <inttypes.h> 11 #include "builtin.h" 12 #include <linux/compiler.h> 13 #include <subcmd/parse-options.h> 14 #include "debug.h" 15 #include "machine.h" 16 #include "symbol.h" 17 18 static 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_function_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 47 int 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