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 <stdlib.h>
19#include <objtool/builtin.h>
20#include <objtool/objtool.h>
21
22bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
23     validate_dup, vmlinux, mcount, noinstr, backup;
24
25static const char * const check_usage[] = {
26	"objtool check [<options>] file.o",
27	NULL,
28};
29
30static const char * const env_usage[] = {
31	"OBJTOOL_ARGS=\"<options>\"",
32	NULL,
33};
34
35const struct option check_options[] = {
36	OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
37	OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
38	OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
39	OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
40	OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
41	OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
42	OPT_BOOLEAN('s', "stats", &stats, "print statistics"),
43	OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
44	OPT_BOOLEAN('n', "noinstr", &noinstr, "noinstr validation for vmlinux.o"),
45	OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
46	OPT_BOOLEAN('M', "mcount", &mcount, "generate __mcount_loc"),
47	OPT_BOOLEAN('B', "backup", &backup, "create .orig files before modification"),
48	OPT_END(),
49};
50
51int cmd_parse_options(int argc, const char **argv, const char * const usage[])
52{
53	const char *envv[16] = { };
54	char *env;
55	int envc;
56
57	env = getenv("OBJTOOL_ARGS");
58	if (env) {
59		envv[0] = "OBJTOOL_ARGS";
60		for (envc = 1; envc < ARRAY_SIZE(envv); ) {
61			envv[envc++] = env;
62			env = strchr(env, ' ');
63			if (!env)
64				break;
65			*env = '\0';
66			env++;
67		}
68
69		parse_options(envc, envv, check_options, env_usage, 0);
70	}
71
72	argc = parse_options(argc, argv, check_options, usage, 0);
73	if (argc != 1)
74		usage_with_options(usage, check_options);
75	return argc;
76}
77
78int cmd_check(int argc, const char **argv)
79{
80	const char *objname;
81	struct objtool_file *file;
82	int ret;
83
84	argc = cmd_parse_options(argc, argv, check_usage);
85	objname = argv[0];
86
87	file = objtool_open_read(objname);
88	if (!file)
89		return 1;
90
91	ret = check(file);
92	if (ret)
93		return ret;
94
95	if (file->elf->changed)
96		return elf_write(file->elf);
97
98	return 0;
99}

 
 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
32bool no_fp, no_unreachable, retpoline, module;
 
33
34static const char * const check_usage[] = {
35	"objtool check [<options>] file.o",
36	NULL,
37};
38
 
 
 
 
 
39const 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_END(),
45};
46
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
47int cmd_check(int argc, const char **argv)
48{
49	const char *objname;
 
 
50
51	argc = parse_options(argc, argv, check_options, check_usage, 0);
 
52
53	if (argc != 1)
54		usage_with_options(check_usage, check_options);
 
 
 
 
 
55
56	objname = argv[0];
 
57
58	return check(objname, false);
59}