1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
 4 */
 5
 6/*
 7 * objtool check:
 8 *
 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.
12 *
13 * For more information, see tools/objtool/Documentation/stack-validation.txt.
14 */
15
16#include <subcmd/parse-options.h>
17#include <string.h>
18#include "builtin.h"
19#include "objtool.h"
20
21bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, validate_dup, vmlinux;
22
23static const char * const check_usage[] = {
24	"objtool check [<options>] file.o",
25	NULL,
26};
27
28const 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('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
38	OPT_END(),
39};
40
41int cmd_check(int argc, const char **argv)
42{
43	const char *objname, *s;
44
45	argc = parse_options(argc, argv, check_options, check_usage, 0);
46
47	if (argc != 1)
48		usage_with_options(check_usage, check_options);
49
50	objname = argv[0];
51
52	s = strstr(objname, "vmlinux.o");
53	if (s && !s[9])
54		vmlinux = true;
55
56	return check(objname, false);
57}