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authorGabe Black <gblack@eecs.umich.edu>2006-02-03 00:16:44 -0500
committerGabe Black <gblack@eecs.umich.edu>2006-02-03 00:16:44 -0500
commit2939a7089ad89e38b24f96143dbd3c4292ac0287 (patch)
tree70c8435015aa0615f9287ce8de437407087b12e5 /sim/byteswap.hh
parent3d2773195c4d7ecd710ceda19612c1dc228fb1e0 (diff)
downloadgem5-2939a7089ad89e38b24f96143dbd3c4292ac0287.tar.xz
byte_swap.hh was removed from arch/alpha/, and replaced by sim/byteswap.hh. The new file uses LittleEndianGuest and BigEndianGuest namespaces to allow selecting the appropriate functions.
arch/alpha/alpha_linux_process.cc: arch/alpha/alpha_tru64_process.cc: Added the endianness namespace. This may change. cpu/exec_context.hh: Changed the include path for byteswap, and forced LittleEndianness for lack of a better solution. cpu/o3/alpha_cpu.hh: Forced LittleEndianness, for lack of a better solution. cpu/o3/alpha_cpu_impl.hh: Cleared away some commented out code. cpu/o3/fetch_impl.hh: Changed the include patch for byteswap, and forced LittleEndianness for lack of a better solution. cpu/simple/cpu.cc: Added an include for byteswap.hh, and fixed the SimpleCPU to LittleEndian. This cpu only does alpha, so that's fine. dev/disk_image.cc: Changed the include path of byteswap.hh kern/freebsd/freebsd_system.cc: kern/linux/linux_system.cc: Added an include for byteswap.hh, and forced LittleEndianness for lack of a better solution. sim/system.cc: Forced LittleEndianness for lack of a better solution. --HG-- extra : convert_revision : b95d3e1265a825e04bd77622a3ac09fbac6bd206
Diffstat (limited to 'sim/byteswap.hh')
-rw-r--r--sim/byteswap.hh141
1 files changed, 141 insertions, 0 deletions
diff --git a/sim/byteswap.hh b/sim/byteswap.hh
new file mode 100644
index 000000000..12d63b6b6
--- /dev/null
+++ b/sim/byteswap.hh
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+//The purpose of this file is to provide endainness conversion utility
+//functions. Depending on the endianness of the guest system, either
+//the LittleEndianGuest or BigEndianGuest namespace is used.
+
+#ifndef __SIM_BYTE_SWAP_HH__
+#define __SIM_BYTE_SWAP_HH__
+
+#include "sim/host.hh"
+
+// This lets us figure out what the byte order of the host system is
+#if defined(linux)
+#include <endian.h>
+#else
+#include <machine/endian.h>
+#endif
+
+//These functions actually perform the swapping for parameters
+//of various bit lengths
+static inline uint64_t
+swap_byte64(uint64_t x)
+{
+ return (uint64_t)((((uint64_t)(x) & 0xff) << 56) |
+ ((uint64_t)(x) & 0xff00ULL) << 40 |
+ ((uint64_t)(x) & 0xff0000ULL) << 24 |
+ ((uint64_t)(x) & 0xff000000ULL) << 8 |
+ ((uint64_t)(x) & 0xff00000000ULL) >> 8 |
+ ((uint64_t)(x) & 0xff0000000000ULL) >> 24 |
+ ((uint64_t)(x) & 0xff000000000000ULL) >> 40 |
+ ((uint64_t)(x) & 0xff00000000000000ULL) >> 56) ;
+}
+
+static inline uint32_t
+swap_byte32(uint32_t x)
+{
+ return (uint32_t)(((uint32_t)(x) & 0xff) << 24 |
+ ((uint32_t)(x) & 0xff00) << 8 | ((uint32_t)(x) & 0xff0000) >> 8 |
+ ((uint32_t)(x) & 0xff000000) >> 24);
+
+}
+
+static inline uint16_t
+swap_byte16(uint16_t x)
+{
+ return (uint16_t)(((uint16_t)(x) & 0xff) << 8 |
+ ((uint16_t)(x) & 0xff00) >> 8);
+}
+
+//This lets the compiler figure out how to call the swap_byte functions above
+//for different data types.
+static inline uint64_t swap_byte(uint64_t x) {return swap_byte64(x);} \
+static inline int64_t swap_byte(int64_t x) {return swap_byte64((uint64_t)x);} \
+static inline uint32_t swap_byte(uint32_t x) {return swap_byte32(x);} \
+static inline int32_t swap_byte(int32_t x) {return swap_byte32((uint32_t)x);} \
+static inline uint16_t swap_byte(uint16_t x) {return swap_byte32(x);} \
+static inline int16_t swap_byte(int16_t x) {return swap_byte16((uint16_t)x);} \
+static inline uint8_t swap_byte(uint8_t x) {return x;} \
+static inline int8_t swap_byte(int8_t x) {return x;} \
+static inline double swap_byte(double x) {return swap_byte64((uint64_t)x);} \
+static inline float swap_byte(float x) {return swap_byte32((uint32_t)x);}
+
+//The conversion functions with fixed endianness on both ends don't need to
+//be in a namespace
+template <typename T> static inline T betole(T value) {return swap_byte(value);}
+template <typename T> static inline T letobe(T value) {return swap_byte(value);}
+
+//For conversions not involving the guest system, we can define the functions
+//conditionally based on the BYTE_ORDER macro and outside of the namespaces
+#if BYTE_ORDER == BIG_ENDIAN
+template <typename T> static inline T htole(T value) {return swap_byte(value);}
+template <typename T> static inline T letoh(T value) {return swap_byte(value);}
+template <typename T> static inline T htobe(T value) {return value;}
+template <typename T> static inline T betoh(T value) {return value;}
+#elif BYTE_ORDER == LITTLE_ENDIAN
+template <typename T> static inline T htole(T value) {return value;}
+template <typename T> static inline T letoh(T value) {return value;}
+template <typename T> static inline T htobe(T value) {return swap_byte(value);}
+template <typename T> static inline T betoh(T value) {return swap_byte(value);}
+#else
+ #error Invalid Endianess
+#endif
+
+namespace BigEndianGuest
+{
+ template <typename T>
+ static inline T gtole(T value) {return betole(value);}
+ template <typename T>
+ static inline T letog(T value) {return letobe(value);}
+ template <typename T>
+ static inline T gtobe(T value) {return value;}
+ template <typename T>
+ static inline T betog(T value) {return value;}
+ template <typename T>
+ static inline T htog(T value) {return htobe(value);}
+ template <typename T>
+ static inline T gtoh(T value) {return betoh(value);}
+}
+
+namespace LittleEndianGuest
+{
+ template <typename T>
+ static inline T gtole(T value) {return value;}
+ template <typename T>
+ static inline T letog(T value) {return value;}
+ template <typename T>
+ static inline T gtobe(T value) {return letobe(value);}
+ template <typename T>
+ static inline T betog(T value) {return betole(value);}
+ template <typename T>
+ static inline T htog(T value) {return htole(value);}
+ template <typename T>
+ static inline T gtoh(T value) {return letoh(value);}
+}
+#endif // __SIM_BYTE_SWAP_HH__