ARM: Add a bit to the ExtMachInst to select thumb mode.

src/arch/arm/predecoder.hh

@@ -73,6 +73,7 @@ namespace ArmISA
         void moreBytes(Addr pc, Addr fetchPC, MachInst inst)
         {
             emi = inst;
+            emi.thumb = (pc & (ULL(1) << PcTBitShift));
             emi.sevenAndFour = bits(inst, 7) && bits(inst, 4);
             emi.isMisc = (bits(inst, 24, 23) == 0x2 && bits(inst, 20) == 0);
         }

src/arch/arm/types.hh

@@ -1,4 +1,16 @@
 /*
+ * Copyright (c) 2010 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
  * Copyright (c) 2007-2008 The Florida State University
  * All rights reserved.
  *
@@ -39,6 +51,10 @@ namespace ArmISA
     typedef uint32_t MachInst;
 
     BitUnion64(ExtMachInst)
+        // Bitfields to select mode.
+        Bitfield<36>     thumb;
+        Bitfield<35>     bigThumb;
+
         // Made up bitfields that make life easier.
         Bitfield<33>     sevenAndFour;
         Bitfield<32>     isMisc;