Re-establish mips basic infrastructure.

src/mips/simulator-mips.h

 // Copyright 2010 the V8 project authors. 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
@@ skipping 19 matching lines @@
 // MIPS binary. This Simulator allows us to run and debug MIPS code generation
 // on regular desktop machines.
 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
 // which will start execution in the Simulator or forwards to the real entry
 // on a MIPS HW platform.
 
 #ifndef V8_MIPS_SIMULATOR_MIPS_H_
 #define V8_MIPS_SIMULATOR_MIPS_H_
 
 #include "allocation.h"
+#include "constants-mips.h"
 
-#if defined(__mips) && !defined(USE_SIMULATOR)
+#if !defined(USE_SIMULATOR)
+// Running without a simulator on a native mips platform.
+
+namespace v8 {
+namespace internal {
 
 // When running without a simulator we call the entry directly.
 #define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
-  entry(p0, p1, p2, p3, p4);
+  entry(p0, p1, p2, p3, p4)
+
+typedef int (*mips_regexp_matcher)(String*, int, const byte*, const byte*,
+                                  void*, int*, Address, int);
+
+// Call the generated regexp code directly. The code at the entry address
+// should act as a function matching the type arm_regexp_matcher.
+// The fifth argument is a dummy that reserves the space used for
+// the return address added by the ExitFrame in native calls.
+#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \
+  (FUNCTION_CAST<mips_regexp_matcher>(entry)(p0, p1, p2, p3, NULL, p4, p5, p6))
+
+#define TRY_CATCH_FROM_ADDRESS(try_catch_address) \
+  (reinterpret_cast<TryCatch*>(try_catch_address))
 
 // The stack limit beyond which we will throw stack overflow errors in
 // generated code. Because generated code on mips uses the C stack, we
 // just use the C stack limit.
 class SimulatorStack : public v8::internal::AllStatic {
  public:
   static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) {
     return c_limit;
   }
 
   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
     return try_catch_address;
   }
 
   static inline void UnregisterCTryCatch() { }
 };
 
+} }  // namespace v8::internal
+
 // Calculated the stack limit beyond which we will throw stack overflow errors.
 // This macro must be called from a C++ method. It relies on being able to take
 // the address of "this" to get a value on the current execution stack and then
 // calculates the stack limit based on that value.
 // NOTE: The check for overflow is not safe as there is no guarantee that the
 // running thread has its stack in all memory up to address 0x00000000.
 #define GENERATED_CODE_STACK_LIMIT(limit) \
   (reinterpret_cast<uintptr_t>(this) >= limit ? \
       reinterpret_cast<uintptr_t>(this) - limit : 0)
 
-// Call the generated regexp code directly. The entry function pointer should
-// expect seven int/pointer sized arguments and return an int.
-#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \
-  entry(p0, p1, p2, p3, p4, p5, p6)
+#else  // !defined(USE_SIMULATOR)
+// Running with a simulator.
 
-#define TRY_CATCH_FROM_ADDRESS(try_catch_address) \
-  reinterpret_cast<TryCatch*>(try_catch_address)
+#include "hashmap.h"
 
+namespace v8 {
+namespace internal {
 
-#else  // #if !defined(__mips) || defined(USE_SIMULATOR)
+// -----------------------------------------------------------------------------
+// Utility functions
 
-// When running with the simulator transition into simulated execution at this
-// point.
-#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
-  reinterpret_cast<Object*>(\
-      assembler::mips::Simulator::current()->Call(FUNCTION_ADDR(entry), 5, \
-                                                  p0, p1, p2, p3, p4))
+class CachePage {
+ public:
+  static const int LINE_VALID = 0;
+  static const int LINE_INVALID = 1;
 
-#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \
-  assembler::mips::Simulator::current()->Call(\
-    FUNCTION_ADDR(entry), 7, p0, p1, p2, p3, p4, p5, p6)
+  static const int kPageShift = 12;
+  static const int kPageSize = 1 << kPageShift;
+  static const int kPageMask = kPageSize - 1;
+  static const int kLineShift = 2;  // The cache line is only 4 bytes right now.
+  static const int kLineLength = 1 << kLineShift;
+  static const int kLineMask = kLineLength - 1;
 
-#define TRY_CATCH_FROM_ADDRESS(try_catch_address) \
-  try_catch_address == NULL ? \
-      NULL : *(reinterpret_cast<TryCatch**>(try_catch_address))
+  CachePage() {
+    memset(&validity_map_, LINE_INVALID, sizeof(validity_map_));
+  }
 
+  char* ValidityByte(int offset) {
+    return &validity_map_[offset >> kLineShift];
+  }
 
-namespace assembler {
-namespace mips {
+  char* CachedData(int offset) {
+    return &data_[offset];
+  }
+
+ private:
+  char data_[kPageSize];   // The cached data.
+  static const int kValidityMapSize = kPageSize >> kLineShift;
+  char validity_map_[kValidityMapSize];  // One byte per line.
+};
 
 class Simulator {
  public:
   friend class Debugger;
 
   // Registers are declared in order. See SMRL chapter 2.
   enum Register {
     no_reg = -1,
     zero_reg = 0,
     at,
@@ skipping 33 matching lines @@
   // for each native thread.
   static Simulator* current();
 
   // Accessors for register state. Reading the pc value adheres to the MIPS
   // architecture specification and is off by a 8 from the currently executing
   // instruction.
   void set_register(int reg, int32_t value);
   int32_t get_register(int reg) const;
   // Same for FPURegisters
   void set_fpu_register(int fpureg, int32_t value);
+  void set_fpu_register_float(int fpureg, float value);
   void set_fpu_register_double(int fpureg, double value);
   int32_t get_fpu_register(int fpureg) const;
+  int64_t get_fpu_register_long(int fpureg) const;
+  float get_fpu_register_float(int fpureg) const;
   double get_fpu_register_double(int fpureg) const;
+  void set_fcsr_bit(uint32_t cc, bool value);
+  bool test_fcsr_bit(uint32_t cc);
+  bool set_fcsr_round_error(double original, double rounded);
 
   // Special case of set_register and get_register to access the raw PC value.
   void set_pc(int32_t value);
   int32_t get_pc() const;
 
   // Accessor to the internal simulator stack area.
   uintptr_t StackLimit() const;
 
   // Executes MIPS instructions until the PC reaches end_sim_pc.
   void Execute();
 
   // Call on program start.
   static void Initialize();
 
   // V8 generally calls into generated JS code with 5 parameters and into
   // generated RegExp code with 7 parameters. This is a convenience function,
   // which sets up the simulator state and grabs the result on return.
-  int32_t Call(byte_* entry, int argument_count, ...);
+  int32_t Call(byte* entry, int argument_count, ...);
 
   // Push an address onto the JS stack.
   uintptr_t PushAddress(uintptr_t address);
 
   // Pop an address from the JS stack.
   uintptr_t PopAddress();
 
+  // ICache checking.
+  static void FlushICache(void* start, size_t size);
+
+  // Returns true if pc register contains one of the 'special_values' defined
+  // below (bad_ra, end_sim_pc).
+  bool has_bad_pc() const;
+
  private:
   enum special_values {
     // Known bad pc value to ensure that the simulator does not execute
     // without being properly setup.
     bad_ra = -1,
     // A pc value used to signal the simulator to stop execution.  Generally
     // the ra is set to this value on transition from native C code to
     // simulated execution, so that the simulator can "return" to the native
     // C code.
     end_sim_pc = -2,
@@ skipping 26 matching lines @@
   // Get Double Higher / Lower word.
   inline int32_t GetDoubleHIW(double* addr);
   inline int32_t GetDoubleLOW(double* addr);
   // Set Double Higher / Lower word.
   inline int32_t SetDoubleHIW(double* addr);
   inline int32_t SetDoubleLOW(double* addr);
 
 
   // Executing is handled based on the instruction type.
   void DecodeTypeRegister(Instruction* instr);
+
+  // Helper function for DecodeTypeRegister.
+  void ConfigureTypeRegister(Instruction* instr,
+                             int32_t& alu_out,
+                             int64_t& i64hilo,
+                             uint64_t& u64hilo,
+                             int32_t& next_pc,
+                             bool& do_interrupt);
+
   void DecodeTypeImmediate(Instruction* instr);
   void DecodeTypeJump(Instruction* instr);
 
   // Used for breakpoints and traps.
   void SoftwareInterrupt(Instruction* instr);
 
   // Executes one instruction.
   void InstructionDecode(Instruction* instr);
   // Execute one instruction placed in a branch delay slot.
   void BranchDelayInstructionDecode(Instruction* instr) {
     if (instr->IsForbiddenInBranchDelay()) {
       V8_Fatal(__FILE__, __LINE__,
                "Eror:Unexpected %i opcode in a branch delay slot.",
-               instr->OpcodeField());
+               instr->OpcodeValue());
     }
     InstructionDecode(instr);
   }
 
+  // ICache.
+  static void CheckICache(Instruction* instr);
+  static void FlushOnePage(intptr_t start, int size);
+  static CachePage* GetCachePage(void* page);
+
+
   enum Exception {
     none,
     kIntegerOverflow,
     kIntegerUnderflow,
     kDivideByZero,
     kNumExceptions
   };
   int16_t exceptions[kNumExceptions];
 
   // Exceptions.
   void SignalExceptions();
 
   // Runtime call support.
   static void* RedirectExternalReference(void* external_function,
-                                         bool fp_return);
+                                         ExternalReference::Type type);
 
   // Used for real time calls that takes two double values as arguments and
   // returns a double.
   void SetFpResult(double result);
 
   // Architecture state.
   // Registers.
   int32_t registers_[kNumSimuRegisters];
   // Coprocessor Registers.
   int32_t FPUregisters_[kNumFPURegisters];
+  // FPU control register.
+  uint32_t FCSR_;
 
   // Simulator support.
+  // Allocate 1MB for stack.
+  static const size_t stack_size_ = 1 * 1024*1024;
   char* stack_;
   bool pc_modified_;
   int icount_;
   static bool initialized_;
+  int break_count_;
+
+  // Icache simulation
+  static v8::internal::HashMap* i_cache_;
 
   // Registered breakpoints.
   Instruction* break_pc_;
   Instr break_instr_;
 };
 
-} }   // namespace assembler::mips
+
+// When running with the simulator transition into simulated execution at this
+// point.
+#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
+  reinterpret_cast<Object*>(Simulator::current()->Call( \
+      FUNCTION_ADDR(entry), 5, p0, p1, p2, p3, p4))
+
+#define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \
+  Simulator::current()->Call(entry, 8, p0, p1, p2, p3, NULL, p4, p5, p6)
+
+#define TRY_CATCH_FROM_ADDRESS(try_catch_address) \
+  try_catch_address == \
+      NULL ? NULL : *(reinterpret_cast<TryCatch**>(try_catch_address))
 
 
 // The simulator has its own stack. Thus it has a different stack limit from
 // the C-based native code.  Setting the c_limit to indicate a very small
 // stack cause stack overflow errors, since the simulator ignores the input.
 // This is unlikely to be an issue in practice, though it might cause testing
 // trouble down the line.
 class SimulatorStack : public v8::internal::AllStatic {
  public:
   static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) {
-    return assembler::mips::Simulator::current()->StackLimit();
+    return Simulator::current()->StackLimit();
   }
 
   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) {
-    assembler::mips::Simulator* sim = assembler::mips::Simulator::current();
+    Simulator* sim = Simulator::current();
     return sim->PushAddress(try_catch_address);
   }
 
   static inline void UnregisterCTryCatch() {
-    assembler::mips::Simulator::current()->PopAddress();
+    Simulator::current()->PopAddress();
   }
 };
 
-#endif  // !defined(__mips) || defined(USE_SIMULATOR)
+} }  // namespace v8::internal
 
+#endif  // !defined(USE_SIMULATOR)
 #endif  // V8_MIPS_SIMULATOR_MIPS_H_