diff --git a/gcc/config/csky/csky-modes.def b/gcc/config/csky/csky-modes.def
index a2427ff17c7..9062efcf929 100644
--- a/gcc/config/csky/csky-modes.def
+++ b/gcc/config/csky/csky-modes.def
@@ -1,2 +1,22 @@
+;; C-SKY extra machine modes.
+;; Copyright (C) 2018-2021 Free Software Foundation, Inc.
+;; Contributed by C-SKY Microsystems and Mentor Graphics.
+;;
+;; This file is part of GCC.
+;;
+;; GCC 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 3, or (at your option)
+;; any later version.
+;;
+;; GCC 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 GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.  */
+
 /* Float modes.  */
 FLOAT_MODE (HF, 2, ieee_half_format);        /* Half-precision floating point */
diff --git a/gcc/config/csky/csky_insn_fpuv2.md b/gcc/config/csky/csky_insn_fpuv2.md
index 0a680f8bf35..d56b61f4032 100644
--- a/gcc/config/csky/csky_insn_fpuv2.md
+++ b/gcc/config/csky/csky_insn_fpuv2.md
@@ -1,3 +1,22 @@
+;; C-SKY FPUV2 instruction descriptions.
+;; Copyright (C) 2018-2021 Free Software Foundation, Inc.
+;; Contributed by C-SKY Microsystems and Mentor Graphics.
+;;
+;; This file is part of GCC.
+;;
+;; GCC 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 3, or (at your option)
+;; any later version.
+;;
+;; GCC 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 GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.  */
 
 ;; -------------------------------------------------------------------------
 ;; Float Abs instructions
diff --git a/gcc/config/csky/csky_insn_fpuv3.md b/gcc/config/csky/csky_insn_fpuv3.md
index 053673c49d2..b5f47980fa6 100644
--- a/gcc/config/csky/csky_insn_fpuv3.md
+++ b/gcc/config/csky/csky_insn_fpuv3.md
@@ -1,3 +1,22 @@
+;; C-SKY FPUV3 instruction descriptions.
+;; Copyright (C) 2018-2021 Free Software Foundation, Inc.
+;; Contributed by C-SKY Microsystems and Mentor Graphics.
+;;
+;; This file is part of GCC.
+;;
+;; GCC 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 3, or (at your option)
+;; any later version.
+;;
+;; GCC 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 GCC; see the file COPYING3.  If not see
+;; <http://www.gnu.org/licenses/>.  */
 
 (define_c_enum "unspec" [
   UNSPEC_MAXNM_F3
diff --git a/gcc/testsuite/gcc.target/csky/fpuv3/fpuv3.exp b/gcc/testsuite/gcc.target/csky/fpuv3/fpuv3.exp
index 1170e12ac28..68c166cd485 100644
--- a/gcc/testsuite/gcc.target/csky/fpuv3/fpuv3.exp
+++ b/gcc/testsuite/gcc.target/csky/fpuv3/fpuv3.exp
@@ -1,20 +1,21 @@
-# Copyright (C) 1997, 2004, 2006, 2007 Free Software Foundation, Inc.
-
+# GCC testsuite for C-SKY targets FPUV3 instructions.
+# Copyright (C) 2012-2021 Free Software Foundation, Inc.
+# Contributed by C-SKY Microsystems and Mentor Graphics.
+#
 # 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 3 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 GCC; see the file COPYING3.  If not see
 # <http://www.gnu.org/licenses/>.
 
-# GCC testsuite that uses the `dg.exp' driver.
 
 # Exit immediately if this isn't a csky target.
 if { ![istarget csky*-*-*]} then {
