tools/objtool/builtin-check.c

/*
 * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

/*
 * objtool check:
 *
 * This command analyzes every .o file and ensures the validity of its stack
 * trace metadata.  It enforces a set of rules on asm code and C inline
 * assembly code so that stack traces can be reliable.
 *
 * For more information, see tools/objtool/Documentation/stack-validation.txt.
 */

#include <subcmd/parse-options.h>
#include "builtin.h"
#include "check.h"

bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess;

static const char * const check_usage[] = {
	"objtool check [<options>] file.o",
	NULL,
};

const struct option check_options[] = {
	OPT_BOOLEAN('f', "no-fp", &no_fp, "Skip frame pointer validation"),
	OPT_BOOLEAN('u', "no-unreachable", &no_unreachable, "Skip 'unreachable instruction' warnings"),
	OPT_BOOLEAN('r', "retpoline", &retpoline, "Validate retpoline assumptions"),
	OPT_BOOLEAN('m', "module", &module, "Indicates the object will be part of a kernel module"),
	OPT_BOOLEAN('b', "backtrace", &backtrace, "unwind on error"),
	OPT_BOOLEAN('a', "uaccess", &uaccess, "enable uaccess checking"),
	OPT_END(),
};

int cmd_check(int argc, const char **argv)
{
	const char *objname;

	argc = parse_options(argc, argv, check_options, check_usage, 0);

	if (argc != 1)
		usage_with_options(check_usage, check_options);

	objname = argv[0];

	return check(objname, false);
}