v4.19.13 snapshot.
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
new file mode 100644
index 0000000..694abc6
--- /dev/null
+++ b/tools/objtool/builtin-check.c
@@ -0,0 +1,59 @@
+/*
+ * 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;
+
+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_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);
+}