Adds MIPS instructions to simulator, assembler, disassembler

runtime/vm/simulator_mips.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.
 
 // Declares a Simulator for MIPS instructions if we are not generating a native
 // MIPS binary. This Simulator allows us to run and debug MIPS code generation
 // on regular desktop machines.
 // Dart calls into generated code by "calling" the InvokeDartCode stub,
 // which will start execution in the Simulator or forwards to the real entry
 // on a MIPS HW platform.
@@ skipping 57 matching lines @@
   int32_t lo_reg_;
 
   int32_t registers_[kNumberOfCpuRegisters];
   uword pc_;
 
   // Simulator support.
   char* stack_;
   int icount_;
   bool delay_slot_;
 
+  // Illegal memory access support.
+  static bool IsIllegalAddress(uword addr) {
+    return addr < 64*1024;
+  }
+
   bool OverflowFrom(int32_t alu_out,
                     int32_t left,
                     int32_t right,
                     bool addition);
 
   void set_pc(uword value) { pc_ = value; }
 
   void Format(Instr* instr, const char* format);
 
+  inline int8_t ReadB(uword addr);
+  inline uint8_t ReadBU(uword addr);
+  inline int16_t ReadH(uword addr, Instr* instr);
+  inline uint16_t ReadHU(uword addr, Instr *instr);
+  inline int ReadW(uword addr, Instr* instr);
+
+  inline void WriteB(uword addr, uint8_t value);
+  inline void WriteH(uword addr, uint16_t value, Instr* isntr);
+  inline void WriteW(uword addr, int value, Instr* instr);
+
   void DecodeSpecial(Instr* instr);
   void DecodeSpecial2(Instr* instr);
+  void DecodeSpecial3(Instr *instr);
   void InstructionDecode(Instr* instr);
 
   void Execute();
   void ExecuteDelaySlot();
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_MIPS_H_