Adds mrc instruction to arm simulator, assembler, disassembler.

runtime/vm/constants_arm.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_CONSTANTS_ARM_H_
 #define VM_CONSTANTS_ARM_H_
 
 namespace dart {
 
 // We support both VFPv3-D16 and VFPv3-D32 profiles, but currently only one at
@@ skipping 257 matching lines @@
   kOffset12Shift = 0,
   kOffset12Bits = 12,
   kOffset12Mask = 0x00000fff,
 
   // Mul instruction register fields encodings.
   kMulRdShift = 16,
   kMulRdBits = 4,
   kMulRnShift = 12,
   kMulRnBits = 4,
 
+  // MRC instruction offset field encoding

[srdjan, 2013/03/04 22:02:17]

ditto

+  kCRmShift = 0,
+  kCRmBits = 4,
+  kOpc2Shift = 5,
+  kOpc2Bits = 3,
+  kCoprocShift = 8,
+  kCoprocBits = 4,
+  kCRnShift = 16,
+  kCRnBits = 4,
+  kOpc1Shift = 21,
+  kOpc1Bits = 3,
+
   kBranchOffsetMask = 0x00ffffff
 };
 
 
 // The class Instr enables access to individual fields defined in the ARM
 // architecture instruction set encoding as described in figure A3-1.
 //
 // Example: Test whether the instruction at ptr sets the condition code bits.
 //
 // bool InstructionSetsConditionCodes(byte* ptr) {
@@ skipping 191 matching lines @@
             ((Bits(4, 4) & 0xd) == 1));
   }
 
   // Test for VFP load and store instructions of type 6.
   inline bool IsVFPLoadStore() const {
     ASSERT(ConditionField() != kSpecialCondition);
     ASSERT(TypeField() == 6);
     return ((Bits(20, 5) & 0x12) == 0x10) && (Bits(9, 3) == 5);
   }
 
+  // Only handle mrc of the id_isar0 register.
+  inline bool IsMrcIdIsar0() const {
+    ASSERT(ConditionField() != kSpecialCondition);
+    ASSERT(TypeField() == 7);
+    return (Bits(21, 3) == 0) && (Bits(16, 4) == 0) &&
+           (Bits(8, 4) == 0xf) && (Bits(5, 3) == 0) &&
+           (Bits(0, 4) == 2);
+  }
+
   // Test for VFP multiple load and store instructions of type 6.
   inline bool IsVFPMultipleLoadStore() const {
     ASSERT(ConditionField() != kSpecialCondition);
     ASSERT(TypeField() == 6);
     int32_t puw = (PUField() << 1) | Bit(21);  // don't care about D bit
     return (Bits(9, 3) == 5) && ((puw == 2) || (puw == 3) || (puw == 5));
   }
 
   // Special accessors that test for existence of a value.
   inline bool HasS()    const { return SField() == 1; }
@@ skipping 12 matching lines @@
   Instr* Next() { return this + kInstrSize; }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
 };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_ARM_H_