Add kbuild.h that can be used by files under tools/

Definitions are taken from the original definitions at
include/linux/kbuild.h

This is needed to expose values from c code to assembly code.

Signed-off-by: Sagi Shahar <sagis@google.com>
---
 tools/include/linux/kbuild.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 tools/include/linux/kbuild.h

diff --git a/tools/include/linux/kbuild.h b/tools/include/linux/kbuild.h
new file mode 100644
index 000000000000..62e20ba9380e
--- /dev/null
+++ b/tools/include/linux/kbuild.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __TOOLS_LINUX_KBUILD_H
+#define __TOOLS_LINUX_KBUILD_H
+
+#include <stddef.h>
+
+#define DEFINE(sym, val) \
+	asm volatile("\n.ascii \"->" #sym " %0 " #val "\"" : : "i" (val))
+
+#define BLANK() asm volatile("\n.ascii \"->\"" : : )
+
+#define OFFSET(sym, str, mem) \
+	DEFINE(sym, offsetof(struct str, mem))
+
+#define COMMENT(x) \
+	asm volatile("\n.ascii \"->#" x "\"")
+
+#endif /* __TOOLS_LINUX_KBUILD_H */
-- 
2.51.0.338.gd7d06c2dae-goog