From eae1e97fb002b44a9d8c46df2da1ddc1d0156ce4 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Fri, 25 May 2012 00:55:24 -0700
Subject: ISA: Make the decode function part of the ISA's decoder.

---
 src/arch/arm/SConscript       |  1 +
 src/arch/arm/decoder.cc       | 38 ++++++++++++++++++++++++++++++++++++++
 src/arch/arm/decoder.hh       | 24 +++++++++++++++++++++---
 src/arch/arm/isa/includes.isa |  1 +
 4 files changed, 61 insertions(+), 3 deletions(-)
 create mode 100644 src/arch/arm/decoder.cc

(limited to 'src/arch/arm')

diff --git a/src/arch/arm/SConscript b/src/arch/arm/SConscript
index 171c04718..0f94455bd 100644
--- a/src/arch/arm/SConscript
+++ b/src/arch/arm/SConscript
@@ -47,6 +47,7 @@ if env['TARGET_ISA'] == 'arm':
 # Workaround for bug in SCons version > 0.97d20071212
 # Scons bug id: 2006 M5 Bug id: 308 
     Dir('isa/formats')
+    Source('decoder.cc')
     Source('faults.cc')
     Source('insts/macromem.cc')
     Source('insts/mem.cc')
diff --git a/src/arch/arm/decoder.cc b/src/arch/arm/decoder.cc
new file mode 100644
index 000000000..be46ff540
--- /dev/null
+++ b/src/arch/arm/decoder.cc
@@ -0,0 +1,38 @@
+/*
+ * 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
+ */
+
+#include "arch/arm/decoder.hh"
+
+namespace ArmISA
+{
+
+DecodeCache Decoder::defaultCache;
+
+}
diff --git a/src/arch/arm/decoder.hh b/src/arch/arm/decoder.hh
index 5525b4a89..a91d70f48 100644
--- a/src/arch/arm/decoder.hh
+++ b/src/arch/arm/decoder.hh
@@ -31,13 +31,31 @@
 #ifndef __ARCH_ARM_DECODER_HH__
 #define __ARCH_ARM_DECODER_HH__
 
-#include "arch/generic/decoder.hh"
+#include "arch/types.hh"
+#include "cpu/decode_cache.hh"
+#include "cpu/static_inst_fwd.hh"
 
 namespace ArmISA
 {
 
-class Decoder : public GenericISA::Decoder
-{};
+class Decoder
+{
+  protected:
+    /// A cache of decoded instruction objects.
+    static DecodeCache defaultCache;
+
+  public:
+    StaticInstPtr decodeInst(ExtMachInst mach_inst);
+
+    /// Decode a machine instruction.
+    /// @param mach_inst The binary instruction to decode.
+    /// @retval A pointer to the corresponding StaticInst object.
+    StaticInstPtr
+    decode(ExtMachInst mach_inst, Addr addr)
+    {
+        return defaultCache.decode(this, mach_inst, addr);
+    }
+};
 
 } // namespace ArmISA
 
diff --git a/src/arch/arm/isa/includes.isa b/src/arch/arm/isa/includes.isa
index 607a5c8b8..5dd13d623 100644
--- a/src/arch/arm/isa/includes.isa
+++ b/src/arch/arm/isa/includes.isa
@@ -63,6 +63,7 @@ output header {{
 }};
 
 output decoder {{
+#include "arch/arm/decoder.hh"
 #include "arch/arm/faults.hh"
 #include "arch/arm/intregs.hh"
 #include "arch/arm/isa_traits.hh"
-- 
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