1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
9 * This command analyzes every .o file and ensures the validity of its stack
10 * trace metadata. It enforces a set of rules on asm code and C inline
11 * assembly code so that stack traces can be reliable.
13 * For more information, see tools/objtool/Documentation/stack-validation.txt.
16 #include <subcmd/parse-options.h>
18 #include <objtool/builtin.h>
19 #include <objtool/objtool.h>
21 bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, validate_dup, vmlinux, mcount, noinstr;
23 static const char * const check_usage[] = {
24 "objtool check [<options>] file.o",
28 const struct option check_options[] = {
29 OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
30 OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
31 OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
32 OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
33 OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
34 OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
35 OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
36 OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
37 OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),
38 OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
39 OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
43 int cmd_check(int argc, const char **argv)
46 struct objtool_file *file;
49 argc = parse_options(argc, argv, check_options, check_usage, 0);
52 usage_with_options(check_usage, check_options);
56 file = objtool_open_read(objname);
64 if (file->elf->changed)
65 return elf_write(file->elf);