Move backend specific files to separate directories.

src/simulator-arm.h

-// Copyright 2008 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
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-// Declares a Simulator for ARM instructions if we are not generating a native
-// ARM binary. This Simulator allows us to run and debug ARM 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 ARM HW platform.
-
-#ifndef V8_SIMULATOR_ARM_H_
-#define V8_SIMULATOR_ARM_H_
-
-#if defined(__arm__)
-
-// 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)
-
-// 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.
-#define GENERATED_CODE_STACK_LIMIT(limit) \
-  (reinterpret_cast<uintptr_t>(this) - limit)
-
-#else  // defined(__arm__)
-
-// When running with the simulator transition into simulated execution at this
-// point.
-#define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \
-  assembler::arm::Simulator::current()->Call((int32_t)entry, (int32_t)p0, \
-    (int32_t)p1, (int32_t)p2, (int32_t)p3, (int32_t)p4)
-
-// The simulator has its own stack. Thus it has a different stack limit from
-// the C-based native code.
-#define GENERATED_CODE_STACK_LIMIT(limit) \
-  (assembler::arm::Simulator::current()->StackLimit())
-
-
-#include "constants-arm.h"
-
-
-namespace assembler { namespace arm {
-
-class Simulator {
- public:
-  friend class Debugger;
-
-  enum Register {
-    no_reg = -1,
-    r0 = 0, r1, r2, r3, r4, r5, r6, r7,
-    r8, r9, r10, r11, r12, r13, r14, r15,
-    num_registers,
-    sp = 13,
-    lr = 14,
-    pc = 15
-  };
-
-  Simulator();
-  ~Simulator();
-
-  // The currently executing Simulator instance. Potentially there can be one
-  // for each native thread.
-  static Simulator* current();
-
-  // Accessors for register state. Reading the pc value adheres to the ARM
-  // 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;
-
-  // 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 ARM instructions until the PC reaches end_sim_pc.
-  void Execute();
-
-  // V8 generally calls into generated code with 5 parameters. This is a
-  // convenience function, which sets up the simulator state and grabs the
-  // result on return.
-  v8::internal::Object* Call(int32_t entry, int32_t p0, int32_t p1,
-                             int32_t p2, int32_t p3, int32_t p4);
-
- private:
-  enum special_values {
-    // Known bad pc value to ensure that the simulator does not execute
-    // without being properly setup.
-    bad_lr = -1,
-    // A pc value used to signal the simulator to stop execution.  Generally
-    // the lr 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
-  };
-
-  // Unsupported instructions use Format to print an error and stop execution.
-  void Format(Instr* instr, const char* format);
-
-  // Checks if the current instruction should be executed based on its
-  // condition bits.
-  bool ConditionallyExecute(Instr* instr);
-
-  // Helper functions to set the conditional flags in the architecture state.
-  void SetNZFlags(int32_t val);
-  void SetCFlag(bool val);
-  void SetVFlag(bool val);
-  bool CarryFrom(int32_t left, int32_t right);
-  bool BorrowFrom(int32_t left, int32_t right);
-  bool OverflowFrom(int32_t alu_out,
-                    int32_t left,
-                    int32_t right,
-                    bool addition);
-
-  // Helper functions to decode common "addressing" modes
-  int32_t GetShiftRm(Instr* instr, bool* carry_out);
-  int32_t GetImm(Instr* instr, bool* carry_out);
-  void HandleRList(Instr* instr, bool load);
-  void SoftwareInterrupt(Instr* instr);
-
-  // Read and write memory.
-  inline uint8_t ReadBU(int32_t addr);
-  inline int8_t ReadB(int32_t addr);
-  inline void WriteB(int32_t addr, uint8_t value);
-  inline void WriteB(int32_t addr, int8_t value);
-
-  inline uint16_t ReadHU(int32_t addr, Instr* instr);
-  inline int16_t ReadH(int32_t addr, Instr* instr);
-  // Note: Overloaded on the sign of the value.
-  inline void WriteH(int32_t addr, uint16_t value, Instr* instr);
-  inline void WriteH(int32_t addr, int16_t value, Instr* instr);
-
-  inline int ReadW(int32_t addr, Instr* instr);
-  inline void WriteW(int32_t addr, int value, Instr* instr);
-
-  // Executing is handled based on the instruction type.
-  void DecodeType01(Instr* instr);  // both type 0 and type 1 rolled into one
-  void DecodeType2(Instr* instr);
-  void DecodeType3(Instr* instr);
-  void DecodeType4(Instr* instr);
-  void DecodeType5(Instr* instr);
-  void DecodeType6(Instr* instr);
-  void DecodeType7(Instr* instr);
-
-  // Executes one instruction.
-  void InstructionDecode(Instr* instr);
-
-  // For use in calls that take two double values, constructed from r0, r1, r2
-  // and r3.
-  void GetFpArgs(double* x, double* y);
-  void SetFpResult(const double& result);
-  void TrashCallerSaveRegisters();
-
-  // architecture state
-  int32_t registers_[16];
-  bool n_flag_;
-  bool z_flag_;
-  bool c_flag_;
-  bool v_flag_;
-
-  // simulator support
-  char* stack_;
-  bool pc_modified_;
-  int icount_;
-
-  // registered breakpoints
-  Instr* break_pc_;
-  instr_t break_instr_;
-};
-
-} }  // namespace assembler::arm
-
-#endif  // defined(__arm__)
-
-#endif  // V8_SIMULATOR_ARM_H_