v4.19.13 snapshot.
diff --git a/include/linux/flat.h b/include/linux/flat.h
new file mode 100644
index 0000000..569b67d
--- /dev/null
+++ b/include/linux/flat.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
+ * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
+ * The Silver Hammer Group, Ltd.
+ *
+ * This file provides the definitions and structures needed to
+ * support uClinux flat-format executables.
+ */
+#ifndef _LINUX_FLAT_H
+#define _LINUX_FLAT_H
+
+#include <uapi/linux/flat.h>
+#include <asm/flat.h>
+
+/*
+ * While it would be nice to keep this header clean, users of older
+ * tools still need this support in the kernel. So this section is
+ * purely for compatibility with old tool chains.
+ *
+ * DO NOT make changes or enhancements to the old format please, just work
+ * with the format above, except to fix bugs with old format support.
+ */
+
+#include <asm/byteorder.h>
+
+#define OLD_FLAT_VERSION 0x00000002L
+#define OLD_FLAT_RELOC_TYPE_TEXT 0
+#define OLD_FLAT_RELOC_TYPE_DATA 1
+#define OLD_FLAT_RELOC_TYPE_BSS 2
+
+typedef union {
+ unsigned long value;
+ struct {
+# if defined(mc68000) && !defined(CONFIG_COLDFIRE)
+ signed long offset : 30;
+ unsigned long type : 2;
+# define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */
+# elif defined(__BIG_ENDIAN_BITFIELD)
+ unsigned long type : 2;
+ signed long offset : 30;
+# define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */
+# elif defined(__LITTLE_ENDIAN_BITFIELD)
+ signed long offset : 30;
+ unsigned long type : 2;
+# define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */
+# else
+# error "Unknown bitfield order for flat files."
+# endif
+ } reloc;
+} flat_v2_reloc_t;
+
+#endif /* _LINUX_FLAT_H */