1 files changed, 74 insertions, 0 deletions
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
new file mode 100644
index 000000000..447a49c03
--- /dev/null
+++ b/tools/objtool/builtin-check.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2015-2017 Josh Poimboeuf <jpoimboe@redhat.com>
+ */
+
+/*
+ * 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 <string.h>
+#include "builtin.h"
+#include "objtool.h"
+
+bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats,
+     validate_dup, vmlinux, sls, unret, rethunk;
+
+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(0,   "rethunk", &rethunk, "validate and annotate rethunk usage"),
+	OPT_BOOLEAN(0,   "unret", &unret, "validate entry unret placement"),
+	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_BOOLEAN('s', "stats", &stats, "print statistics"),
+	OPT_BOOLEAN('d', "duplicate", &validate_dup, "duplicate validation for vmlinux.o"),
+	OPT_BOOLEAN('l', "vmlinux", &vmlinux, "vmlinux.o validation"),
+	OPT_BOOLEAN('S', "sls", &sls, "validate straight-line-speculation"),
+	OPT_END(),
+};
+
+int cmd_check(int argc, const char **argv)
+{
+	const char *objname, *s;
+	struct objtool_file *file;
+	int ret;
+
+	argc = parse_options(argc, argv, check_options, check_usage, 0);
+
+	if (argc != 1)
+		usage_with_options(check_usage, check_options);
+
+	objname = argv[0];
+
+	s = strstr(objname, "vmlinux.o");
+	if (s && !s[9])
+		vmlinux = true;
+
+	file = objtool_open_read(objname);
+	if (!file)
+		return 1;
+
+	ret = check(file);
+	if (ret)
+		return ret;
+
+	if (file->elf->changed)
+		return elf_write(file->elf);
+
+	return 0;
+}