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authorEric Andersen <andersen@codepoet.org>2002-02-02 19:03:57 +0000
committerEric Andersen <andersen@codepoet.org>2002-02-02 19:03:57 +0000
commit8dc1d08d0c3a5abe3856b04a5a864227fe0ba62d (patch)
tree65d254a60aec64fb933cf3c4c11ffa7235e02413 /libc/sysdeps/linux/h8300/bits/byteswap.h
parent327b0c83302af0a288c65a03f4f2c82af321bd28 (diff)
Add in support for the Hitach H8/300H architecture,
contributed by Yoshinori Sato <qzb04471@nifty.ne.jp>
Diffstat (limited to 'libc/sysdeps/linux/h8300/bits/byteswap.h')
-rw-r--r--libc/sysdeps/linux/h8300/bits/byteswap.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/h8300/bits/byteswap.h b/libc/sysdeps/linux/h8300/bits/byteswap.h
new file mode 100644
index 000000000..56909f5c0
--- /dev/null
+++ b/libc/sysdeps/linux/h8300/bits/byteswap.h
@@ -0,0 +1,67 @@
+/* Macros to swap the order of bytes in integer values. m68k version.
+ Copyright (C) 1997 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H
+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
+#endif
+
+/* 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_16(x) \
+ ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+
+/* Swap bytes in 32 bit value. */
+#define __bswap_constant_32(x) \
+ ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
+ (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
+
+#if defined __GNUC__ && __GNUC__ >= 2
+# define __bswap_32(x) \
+ __extension__ \
+ ({ unsigned int __v; \
+ if (__builtin_constant_p (x)) \
+ __v = __bswap_constant_32 (x); \
+ else \
+ __asm__ __volatile__ ("mov.l %0,er0\n\t" \
+ "mov.b r0l,r1h\n\t" \
+ "mov.b r0h,r1l\n\t" \
+ "mov.w r1,e1\n\t" \
+ "mov.w e0,r0\n\t" \
+ "mov.b r0l,r1h\n\t" \
+ "mov.b r0h,r1l\n\t" \
+ "mov.l er1,%0" \
+ : "=d" (__v) \
+ : "0" (x): "er0","er1"); \
+ __v; })
+#else
+# define __bswap_32(x) __bswap_constant_32 (x)
+#endif
+
+#if defined __GNUC__ && __GNUC__ >= 2
+/* Swap bytes in 64 bit value. */
+# define __bswap_64(x) \
+ __extension__ \
+ ({ union { unsigned long long int __ll; \
+ unsigned long int __l[2]; } __v, __r; \
+ __v.__ll = (x); \
+ __r.__l[0] = __bswap_32 (__v.__l[1]); \
+ __r.__l[1] = __bswap_32 (__v.__l[0]); \
+ __r.__ll; })
+#endif