1 /* 2 * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com> 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 /* 19 * objtool check: 20 * 21 * This command analyzes every .o file and ensures the validity of its stack 22 * trace metadata. It enforces a set of rules on asm code and C inline 23 * assembly code so that stack traces can be reliable. 24 * 25 * For more information, see tools/objtool/Documentation/stack-validation.txt. 26 */ 27 28 #include <subcmd/parse-options.h> 29 #include "builtin.h" 30 #include "check.h" 31 32 bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess; 33 34 static const char * const check_usage[] = { 35 "objtool check [<options>] file.o", 36 NULL, 37 }; 38 39 const struct option check_options[] = { 40 OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"), 41 OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"), 42 OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"), 43 OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"), 44 OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"), 45 OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"), 46 OPT_END(), 47 }; 48 49 int cmd_check(int argc, const char **argv) 50 { 51 const char *objname; 52 53 argc = parse_options(argc, argv, check_options, check_usage, 0); 54 55 if (argc != 1) 56 usage_with_options(check_usage, check_options); 57 58 objname = argv[0]; 59 60 return check(objname, false); 61 } 62