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authorDavid McCullough <davidm@snapgear.com>2003-10-14 11:52:32 +0000
committerDavid McCullough <davidm@snapgear.com>2003-10-14 11:52:32 +0000
commit94b92c2fab333403aa43fd55ec858fdbf666f8c3 (patch)
tree10e30871a37756c010dbbb26326bf934ba434552 /libc/sysdeps/linux/microblaze/bits/byteswap.h
parent34c5a8290b32d93beca6ae8f9c346bbadf408591 (diff)
Microblaze port from the uClinux-dist,
contributed by John Williams <jwilliams@itee.uq.edu.au>
Diffstat (limited to 'libc/sysdeps/linux/microblaze/bits/byteswap.h')
-rw-r--r--libc/sysdeps/linux/microblaze/bits/byteswap.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/microblaze/bits/byteswap.h b/libc/sysdeps/linux/microblaze/bits/byteswap.h
new file mode 100644
index 000000000..9b6a5d722
--- /dev/null
+++ b/libc/sysdeps/linux/microblaze/bits/byteswap.h
@@ -0,0 +1,41 @@
+/*
+ * libc/sysdeps/linux/microblaze/bits/byteswap.h -- Macros to swap the order
+ * of bytes in integer values
+ *
+ * Copyright (C) 2001 NEC Corporation
+ * Copyright (C) 2001 Miles Bader <miles@gnu.org>
+ * Copyright (C) 1997,1998,2001 Free Software Foundation, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License. See the file COPYING.LIB in the main
+ * directory of this archive for more details.
+ */
+
+#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. */
+#define __bswap_constant_16(x) \
+ ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+
+# define __bswap_16(x) __bswap_constant_16 (x)
+
+/* Swap bytes in 32 bit value. */
+#define __bswap_constant_32(x) \
+ ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
+ (((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
+
+# define __bswap_32(x) __bswap_constant_32 (x)
+
+#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]; } __bswap_64_v, __bswap_64_r; \
+ __bswap_64_v.__ll = (x); \
+ __bswap_64_r.__l[0] = __bswap_32 (__bswap_64_v.__l[1]); \
+ __bswap_64_r.__l[1] = __bswap_32 (__bswap_64_v.__l[0]); \
+ __bswap_64_r.__ll; }))
+#endif