1 files changed, 87 insertions, 0 deletions
diff --git a/ports/sysdeps/m68k/bits/byteswap.h b/ports/sysdeps/m68k/bits/byteswap.h
new file mode 100644
index 0000000000..029fb32a5c
--- /dev/null
+++ b/ports/sysdeps/m68k/bits/byteswap.h
@@ -0,0 +1,87 @@
+/* Macros to swap the order of bytes in integer values.  m68k version.
+   Copyright (C) 1997, 2002, 2008, 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
+#endif
+
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H 1
+
+/* Swap bytes in 16 bit value.  We don't provide an assembler version
+   because GCC is smart enough to generate optimal assembler output, and
+   this allows for better cse.  */
+#define __bswap_constant_16(x) \
+  ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
+
+static __inline unsigned short int
+__bswap_16 (unsigned short int __bsx)
+{
+  return __bswap_constant_16 (__bsx);
+}
+
+/* Swap bytes in 32 bit value.  */
+#define __bswap_constant_32(x) \
+  ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >>  8) |		      \
+   (((x) & 0x0000ff00u) <<  8) | (((x) & 0x000000ffu) << 24))
+
+#if !defined(__mcoldfire__)
+static __inline unsigned int
+__bswap_32 (unsigned int __bsx)
+{
+  if (__builtin_constant_p (__bsx))
+    return __bswap_constant_32 (__bsx);
+  __asm__ __volatile__ ("ror%.w %#8, %0;"
+			"swap %0;"
+			"ror%.w %#8, %0"
+			: "+d" (__bsx));
+  return __bsx;
+}
+#else
+static __inline unsigned int
+__bswap_32 (unsigned int __bsx)
+{
+  return __bswap_constant_32 (__bsx);
+}
+#endif
+
+#if defined __GNUC__ && __GNUC__ >= 2
+/* Swap bytes in 64 bit value.  */
+# define __bswap_constant_64(x) \
+  __extension__								      \
+  ((((x) & 0xff00000000000000ull) >> 56)				      \
+   | (((x) & 0x00ff000000000000ull) >> 40)				      \
+   | (((x) & 0x0000ff0000000000ull) >> 24)				      \
+   | (((x) & 0x000000ff00000000ull) >> 8)				      \
+   | (((x) & 0x00000000ff000000ull) << 8)				      \
+   | (((x) & 0x0000000000ff0000ull) << 24)				      \
+   | (((x) & 0x000000000000ff00ull) << 40)				      \
+   | (((x) & 0x00000000000000ffull) << 56))
+
+/* Swap bytes in 64 bit value.  */
+static __inline unsigned long long
+__bswap_64 (unsigned long long __bsx)
+{
+  if (__builtin_constant_p (__bsx))
+    return __bswap_constant_64 (__bsx);
+  return (__bswap_32 (__bsx >> 32)
+	  | ((unsigned long long) __bswap_32 (__bsx) << 32));
+}
+#endif
+
+#endif /* _BITS_BYTESWAP_H */