4 files changed, 29 insertions, 2 deletions

diff --git a/src/arch/x86/predecoder.cc b/src/arch/x86/predecoder.cc
index 5c98a1831..72b60385b 100644
--- a/src/arch/x86/predecoder.cc
+++ b/src/arch/x86/predecoder.cc
@@ -77,6 +77,7 @@ namespace X86ISA
 
         emi.modRM = 0;
         emi.sib = 0;
+        emi.mode = 0;
     }
 
     void Predecoder::process()
diff --git a/src/arch/x86/predecoder.hh b/src/arch/x86/predecoder.hh
index 0708875c1..3c858f061 100644
--- a/src/arch/x86/predecoder.hh
+++ b/src/arch/x86/predecoder.hh
@@ -176,7 +176,10 @@ namespace X86ISA
             tc(_tc), basePC(0), origPC(0), offset(0),
             outOfBytes(true), emiIsReady(false),
             state(ResetState)
-        {}
+        {
+            emi.mode.mode = LongMode;
+            emi.mode.submode = SixtyFourBitMode;
+        }
 
         ThreadContext * getTC()
         {
diff --git a/src/arch/x86/types.hh b/src/arch/x86/types.hh
index 225258358..fc9f1d82b 100644
--- a/src/arch/x86/types.hh
+++ b/src/arch/x86/types.hh
@@ -120,6 +120,24 @@ namespace X86ISA
         Bitfield<2,0> bottom3;
     EndBitUnion(Opcode)
 
+    BitUnion8(OperatingMode)
+        Bitfield<3> mode;
+        Bitfield<2,0> submode;
+    EndBitUnion(OperatingMode)
+
+    enum X86Mode {
+        LongMode,
+        LegacyMode
+    };
+
+    enum X86SubMode {
+        SixtyFourBitMode,
+        CompatabilityMode,
+        ProtectedMode,
+        Virtual8086Mode,
+        RealMode
+    };
+
     //The intermediate structure the x86 predecoder returns.
     struct ExtMachInst
     {
@@ -151,6 +169,9 @@ namespace X86ISA
         uint8_t opSize;
         //The effective address size.
         uint8_t addrSize;
+
+        //Mode information
+        OperatingMode mode;
     };
 
     inline static std::ostream &
@@ -172,6 +193,8 @@ namespace X86ISA
     inline static bool
         operator == (const ExtMachInst &emi1, const ExtMachInst &emi2)
     {
+        if(emi1.mode != emi2.mode)
+            return false;
         if(emi1.legacy != emi2.legacy)
             return false;
         if(emi1.rex != emi2.rex)
diff --git a/src/arch/x86/utility.hh b/src/arch/x86/utility.hh
index 1c98e7fbc..ed401a519 100644
--- a/src/arch/x86/utility.hh
+++ b/src/arch/x86/utility.hh
@@ -79,7 +79,7 @@ namespace __hash_namespace {
                     ((uint64_t)emi.opcode.prefixB << 8) |
                     ((uint64_t)emi.opcode.op)) ^
                     emi.immediate ^ emi.displacement ^
-                    emi.opSize;
+                    emi.mode ^ emi.opSize;
         };
     };
 }