From aade13769fc6c666bb855e0745e042c82f9941d6 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Sat, 2 Jul 2011 22:34:29 -0700
Subject: ISA: Use readBytes/writeBytes for all instruction level memory
 operations.

---
 src/arch/x86/memhelpers.hh | 120 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/arch/x86/memhelpers.hh

(limited to 'src/arch/x86/memhelpers.hh')

diff --git a/src/arch/x86/memhelpers.hh b/src/arch/x86/memhelpers.hh
new file mode 100644
index 000000000..9dd54b937
--- /dev/null
+++ b/src/arch/x86/memhelpers.hh
@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2011 Google
+ * 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.
+ *
+ * Authors: Gabe Black
+ */
+
+#ifndef __ARCH_X86_MEMHELPERS_HH__
+#define __ARCH_X86_MEMHELPERS_HH__
+
+#include "base/types.hh"
+#include "sim/byteswap.hh"
+#include "sim/fault_fwd.hh"
+#include "sim/insttracer.hh"
+
+namespace X86ISA
+{
+
+template <class XC>
+Fault
+readMemTiming(XC *xc, Trace::InstRecord *traceData, Addr addr,
+        uint64_t &mem, unsigned dataSize, unsigned flags)
+{
+    return xc->readBytes(addr, (uint8_t *)&mem, dataSize, flags);
+}
+
+static inline uint64_t
+getMem(PacketPtr pkt, unsigned dataSize, Trace::InstRecord *traceData)
+{
+    uint64_t mem;
+    switch (dataSize) {
+      case 1:
+        mem = pkt->get<uint8_t>();
+        break;
+      case 2:
+        mem = pkt->get<uint16_t>();
+        break;
+      case 4:
+        mem = pkt->get<uint32_t>();
+        break;
+      case 8:
+        mem = pkt->get<uint64_t>();
+        break;
+      default:
+        panic("Unhandled size in getMem.\n");
+    }
+    if (traceData)
+        traceData->setData(mem);
+    return mem;
+}
+
+template <class XC>
+Fault
+readMemAtomic(XC *xc, Trace::InstRecord *traceData, Addr addr, uint64_t &mem,
+        unsigned dataSize, unsigned flags)
+{
+    memset(&mem, 0, sizeof(mem));
+    Fault fault = readMemTiming(xc, traceData, addr, mem, dataSize, flags);
+    if (fault == NoFault) {
+        // If LE to LE, this is a nop, if LE to BE, the actual data ends up
+        // in the right place because the LSBs where at the low addresses on
+        // access. This doesn't work for BE guests.
+        mem = gtoh(mem);
+        if (traceData)
+            traceData->setData(mem);
+    }
+    return fault;
+}
+
+template <class XC>
+Fault
+writeMemTiming(XC *xc, Trace::InstRecord *traceData, uint64_t mem,
+        unsigned dataSize, Addr addr, unsigned flags, uint64_t *res)
+{
+    if (traceData) {
+        traceData->setData(mem);
+    }
+    mem = TheISA::htog(mem);
+    return xc->writeBytes((uint8_t *)&mem, dataSize, addr, flags, res);
+}
+
+template <class XC>
+Fault
+writeMemAtomic(XC *xc, Trace::InstRecord *traceData, uint64_t mem,
+        unsigned dataSize, Addr addr, unsigned flags, uint64_t *res)
+{
+    Fault fault = writeMemTiming(xc, traceData, mem, dataSize, addr, flags,
+            res);
+    if (fault == NoFault && res != NULL) {
+        *res = gtoh(*res);
+    }
+    return fault;
+}
+
+}
+
+#endif
-- 
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