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| 1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 the V8 project authors. All rights reserved. | 
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without | 
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are | 
| 4 // met: | 4 // met: | 
| 5 // | 5 // | 
| 6 //     * Redistributions of source code must retain the above copyright | 6 //     * Redistributions of source code must retain the above copyright | 
| 7 //       notice, this list of conditions and the following disclaimer. | 7 //       notice, this list of conditions and the following disclaimer. | 
| 8 //     * Redistributions in binary form must reproduce the above | 8 //     * Redistributions in binary form must reproduce the above | 
| 9 //       copyright notice, this list of conditions and the following | 9 //       copyright notice, this list of conditions and the following | 
| 10 //       disclaimer in the documentation and/or other materials provided | 10 //       disclaimer in the documentation and/or other materials provided | 
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| 49   (entry(p0, p1, p2, p3, p4)) | 49   (entry(p0, p1, p2, p3, p4)) | 
| 50 | 50 | 
| 51 typedef int (*arm_regexp_matcher)(String*, int, const byte*, const byte*, | 51 typedef int (*arm_regexp_matcher)(String*, int, const byte*, const byte*, | 
| 52                                   void*, int*, Address, int); | 52                                   void*, int*, Address, int); | 
| 53 | 53 | 
| 54 | 54 | 
| 55 // Call the generated regexp code directly. The code at the entry address | 55 // Call the generated regexp code directly. The code at the entry address | 
| 56 // should act as a function matching the type arm_regexp_matcher. | 56 // should act as a function matching the type arm_regexp_matcher. | 
| 57 // The fifth argument is a dummy that reserves the space used for | 57 // The fifth argument is a dummy that reserves the space used for | 
| 58 // the return address added by the ExitFrame in native calls. | 58 // the return address added by the ExitFrame in native calls. | 
| 59 #define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \ | 59 #define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7) \ | 
| 60   (FUNCTION_CAST<arm_regexp_matcher>(entry)(p0, p1, p2, p3, NULL, p4, p5, p6)) | 60   (FUNCTION_CAST<arm_regexp_matcher>(entry)(                              \ | 
|  | 61       p0, p1, p2, p3, NULL, p4, p5, p6, p7)) | 
| 61 | 62 | 
| 62 #define TRY_CATCH_FROM_ADDRESS(try_catch_address) \ | 63 #define TRY_CATCH_FROM_ADDRESS(try_catch_address) \ | 
| 63   (reinterpret_cast<TryCatch*>(try_catch_address)) | 64   reinterpret_cast<TryCatch*>(try_catch_address) | 
| 64 | 65 | 
| 65 // The stack limit beyond which we will throw stack overflow errors in | 66 // The stack limit beyond which we will throw stack overflow errors in | 
| 66 // generated code. Because generated code on arm uses the C stack, we | 67 // generated code. Because generated code on arm uses the C stack, we | 
| 67 // just use the C stack limit. | 68 // just use the C stack limit. | 
| 68 class SimulatorStack : public v8::internal::AllStatic { | 69 class SimulatorStack : public v8::internal::AllStatic { | 
| 69  public: | 70  public: | 
| 70   static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) { | 71   static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) { | 
| 71     return c_limit; | 72     return c_limit; | 
| 72   } | 73   } | 
| 73 | 74 | 
| 74   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) { | 75   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) { | 
| 75     return try_catch_address; | 76     return try_catch_address; | 
| 76   } | 77   } | 
| 77 | 78 | 
| 78   static inline void UnregisterCTryCatch() { } | 79   static inline void UnregisterCTryCatch() { } | 
| 79 }; | 80 }; | 
| 80 | 81 | 
| 81 } }  // namespace v8::internal |  | 
| 82 |  | 
| 83 #else  // !defined(USE_SIMULATOR) | 82 #else  // !defined(USE_SIMULATOR) | 
| 84 // Running with a simulator. | 83 // Running with a simulator. | 
| 85 | 84 | 
| 86 #include "constants-arm.h" | 85 #include "constants-arm.h" | 
| 87 #include "hashmap.h" | 86 #include "hashmap.h" | 
| 88 #include "assembler.h" | 87 #include "assembler.h" | 
| 89 | 88 | 
| 90 namespace v8 { | 89 namespace v8 { | 
| 91 namespace internal { | 90 namespace internal { | 
| 92 | 91 | 
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| 116 | 115 | 
| 117  private: | 116  private: | 
| 118   char data_[kPageSize];   // The cached data. | 117   char data_[kPageSize];   // The cached data. | 
| 119   static const int kValidityMapSize = kPageSize >> kLineShift; | 118   static const int kValidityMapSize = kPageSize >> kLineShift; | 
| 120   char validity_map_[kValidityMapSize];  // One byte per line. | 119   char validity_map_[kValidityMapSize];  // One byte per line. | 
| 121 }; | 120 }; | 
| 122 | 121 | 
| 123 | 122 | 
| 124 class Simulator { | 123 class Simulator { | 
| 125  public: | 124  public: | 
| 126   friend class Debugger; | 125   friend class ArmDebugger; | 
| 127   enum Register { | 126   enum Register { | 
| 128     no_reg = -1, | 127     no_reg = -1, | 
| 129     r0 = 0, r1, r2, r3, r4, r5, r6, r7, | 128     r0 = 0, r1, r2, r3, r4, r5, r6, r7, | 
| 130     r8, r9, r10, r11, r12, r13, r14, r15, | 129     r8, r9, r10, r11, r12, r13, r14, r15, | 
| 131     num_registers, | 130     num_registers, | 
| 132     sp = 13, | 131     sp = 13, | 
| 133     lr = 14, | 132     lr = 14, | 
| 134     pc = 15, | 133     pc = 15, | 
| 135     s0 = 0, s1, s2, s3, s4, s5, s6, s7, | 134     s0 = 0, s1, s2, s3, s4, s5, s6, s7, | 
| 136     s8, s9, s10, s11, s12, s13, s14, s15, | 135     s8, s9, s10, s11, s12, s13, s14, s15, | 
| 137     s16, s17, s18, s19, s20, s21, s22, s23, | 136     s16, s17, s18, s19, s20, s21, s22, s23, | 
| 138     s24, s25, s26, s27, s28, s29, s30, s31, | 137     s24, s25, s26, s27, s28, s29, s30, s31, | 
| 139     num_s_registers = 32, | 138     num_s_registers = 32, | 
| 140     d0 = 0, d1, d2, d3, d4, d5, d6, d7, | 139     d0 = 0, d1, d2, d3, d4, d5, d6, d7, | 
| 141     d8, d9, d10, d11, d12, d13, d14, d15, | 140     d8, d9, d10, d11, d12, d13, d14, d15, | 
| 142     num_d_registers = 16 | 141     num_d_registers = 16 | 
| 143   }; | 142   }; | 
| 144 | 143 | 
| 145   Simulator(); | 144   Simulator(); | 
| 146   ~Simulator(); | 145   ~Simulator(); | 
| 147 | 146 | 
| 148   // The currently executing Simulator instance. Potentially there can be one | 147   // The currently executing Simulator instance. Potentially there can be one | 
| 149   // for each native thread. | 148   // for each native thread. | 
| 150   static Simulator* current(); | 149   static Simulator* current(v8::internal::Isolate* isolate); | 
| 151 | 150 | 
| 152   // Accessors for register state. Reading the pc value adheres to the ARM | 151   // Accessors for register state. Reading the pc value adheres to the ARM | 
| 153   // architecture specification and is off by a 8 from the currently executing | 152   // architecture specification and is off by a 8 from the currently executing | 
| 154   // instruction. | 153   // instruction. | 
| 155   void set_register(int reg, int32_t value); | 154   void set_register(int reg, int32_t value); | 
| 156   int32_t get_register(int reg) const; | 155   int32_t get_register(int reg) const; | 
| 157   void set_dw_register(int dreg, const int* dbl); | 156   void set_dw_register(int dreg, const int* dbl); | 
| 158 | 157 | 
| 159   // Support for VFP. | 158   // Support for VFP. | 
| 160   void set_s_register(int reg, unsigned int value); | 159   void set_s_register(int reg, unsigned int value); | 
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| 184   // which sets up the simulator state and grabs the result on return. | 183   // which sets up the simulator state and grabs the result on return. | 
| 185   int32_t Call(byte* entry, int argument_count, ...); | 184   int32_t Call(byte* entry, int argument_count, ...); | 
| 186 | 185 | 
| 187   // Push an address onto the JS stack. | 186   // Push an address onto the JS stack. | 
| 188   uintptr_t PushAddress(uintptr_t address); | 187   uintptr_t PushAddress(uintptr_t address); | 
| 189 | 188 | 
| 190   // Pop an address from the JS stack. | 189   // Pop an address from the JS stack. | 
| 191   uintptr_t PopAddress(); | 190   uintptr_t PopAddress(); | 
| 192 | 191 | 
| 193   // ICache checking. | 192   // ICache checking. | 
| 194   static void FlushICache(void* start, size_t size); | 193   static void FlushICache(v8::internal::HashMap* i_cache, void* start, | 
|  | 194                           size_t size); | 
| 195 | 195 | 
| 196   // Returns true if pc register contains one of the 'special_values' defined | 196   // Returns true if pc register contains one of the 'special_values' defined | 
| 197   // below (bad_lr, end_sim_pc). | 197   // below (bad_lr, end_sim_pc). | 
| 198   bool has_bad_pc() const; | 198   bool has_bad_pc() const; | 
| 199 | 199 | 
| 200  private: | 200  private: | 
| 201   enum special_values { | 201   enum special_values { | 
| 202     // Known bad pc value to ensure that the simulator does not execute | 202     // Known bad pc value to ensure that the simulator does not execute | 
| 203     // without being properly setup. | 203     // without being properly setup. | 
| 204     bad_lr = -1, | 204     bad_lr = -1, | 
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| 280 | 280 | 
| 281   void DecodeVMOVBetweenCoreAndSinglePrecisionRegisters(Instruction* instr); | 281   void DecodeVMOVBetweenCoreAndSinglePrecisionRegisters(Instruction* instr); | 
| 282   void DecodeVCMP(Instruction* instr); | 282   void DecodeVCMP(Instruction* instr); | 
| 283   void DecodeVCVTBetweenDoubleAndSingle(Instruction* instr); | 283   void DecodeVCVTBetweenDoubleAndSingle(Instruction* instr); | 
| 284   void DecodeVCVTBetweenFloatingPointAndInteger(Instruction* instr); | 284   void DecodeVCVTBetweenFloatingPointAndInteger(Instruction* instr); | 
| 285 | 285 | 
| 286   // Executes one instruction. | 286   // Executes one instruction. | 
| 287   void InstructionDecode(Instruction* instr); | 287   void InstructionDecode(Instruction* instr); | 
| 288 | 288 | 
| 289   // ICache. | 289   // ICache. | 
| 290   static void CheckICache(Instruction* instr); | 290   static void CheckICache(v8::internal::HashMap* i_cache, Instruction* instr); | 
| 291   static void FlushOnePage(intptr_t start, int size); | 291   static void FlushOnePage(v8::internal::HashMap* i_cache, intptr_t start, | 
| 292   static CachePage* GetCachePage(void* page); | 292                            int size); | 
|  | 293   static CachePage* GetCachePage(v8::internal::HashMap* i_cache, void* page); | 
| 293 | 294 | 
| 294   // Runtime call support. | 295   // Runtime call support. | 
| 295   static void* RedirectExternalReference( | 296   static void* RedirectExternalReference( | 
| 296       void* external_function, | 297       void* external_function, | 
| 297       v8::internal::ExternalReference::Type type); | 298       v8::internal::ExternalReference::Type type); | 
| 298 | 299 | 
| 299   // For use in calls that take two double values, constructed from r0, r1, r2 | 300   // For use in calls that take two double values, constructed from r0, r1, r2 | 
| 300   // and r3. | 301   // and r3. | 
| 301   void GetFpArgs(double* x, double* y); | 302   void GetFpArgs(double* x, double* y); | 
| 302   void SetFpResult(const double& result); | 303   void SetFpResult(const double& result); | 
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| 326   bool inv_op_vfp_flag_; | 327   bool inv_op_vfp_flag_; | 
| 327   bool div_zero_vfp_flag_; | 328   bool div_zero_vfp_flag_; | 
| 328   bool overflow_vfp_flag_; | 329   bool overflow_vfp_flag_; | 
| 329   bool underflow_vfp_flag_; | 330   bool underflow_vfp_flag_; | 
| 330   bool inexact_vfp_flag_; | 331   bool inexact_vfp_flag_; | 
| 331 | 332 | 
| 332   // Simulator support. | 333   // Simulator support. | 
| 333   char* stack_; | 334   char* stack_; | 
| 334   bool pc_modified_; | 335   bool pc_modified_; | 
| 335   int icount_; | 336   int icount_; | 
| 336   static bool initialized_; |  | 
| 337 | 337 | 
| 338   // Icache simulation | 338   // Icache simulation | 
| 339   static v8::internal::HashMap* i_cache_; | 339   v8::internal::HashMap* i_cache_; | 
| 340 | 340 | 
| 341   // Registered breakpoints. | 341   // Registered breakpoints. | 
| 342   Instruction* break_pc_; | 342   Instruction* break_pc_; | 
| 343   Instr break_instr_; | 343   Instr break_instr_; | 
| 344 | 344 | 
|  | 345   v8::internal::Isolate* isolate_; | 
|  | 346 | 
| 345   // A stop is watched if its code is less than kNumOfWatchedStops. | 347   // A stop is watched if its code is less than kNumOfWatchedStops. | 
| 346   // Only watched stops support enabling/disabling and the counter feature. | 348   // Only watched stops support enabling/disabling and the counter feature. | 
| 347   static const uint32_t kNumOfWatchedStops = 256; | 349   static const uint32_t kNumOfWatchedStops = 256; | 
| 348 | 350 | 
| 349   // Breakpoint is disabled if bit 31 is set. | 351   // Breakpoint is disabled if bit 31 is set. | 
| 350   static const uint32_t kStopDisabledBit = 1 << 31; | 352   static const uint32_t kStopDisabledBit = 1 << 31; | 
| 351 | 353 | 
| 352   // A stop is enabled, meaning the simulator will stop when meeting the | 354   // A stop is enabled, meaning the simulator will stop when meeting the | 
| 353   // instruction, if bit 31 of watched_stops[code].count is unset. | 355   // instruction, if bit 31 of watched_stops[code].count is unset. | 
| 354   // The value watched_stops[code].count & ~(1 << 31) indicates how many times | 356   // The value watched_stops[code].count & ~(1 << 31) indicates how many times | 
| 355   // the breakpoint was hit or gone through. | 357   // the breakpoint was hit or gone through. | 
| 356   struct StopCountAndDesc { | 358   struct StopCountAndDesc { | 
| 357     uint32_t count; | 359     uint32_t count; | 
| 358     char* desc; | 360     char* desc; | 
| 359   }; | 361   }; | 
| 360   StopCountAndDesc watched_stops[kNumOfWatchedStops]; | 362   StopCountAndDesc watched_stops[kNumOfWatchedStops]; | 
| 361 }; | 363 }; | 
| 362 | 364 | 
| 363 | 365 | 
| 364 // When running with the simulator transition into simulated execution at this | 366 // When running with the simulator transition into simulated execution at this | 
| 365 // point. | 367 // point. | 
| 366 #define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \ | 368 #define CALL_GENERATED_CODE(entry, p0, p1, p2, p3, p4) \ | 
| 367   reinterpret_cast<Object*>(Simulator::current()->Call( \ | 369   reinterpret_cast<Object*>(Simulator::current(Isolate::Current())->Call( \ | 
| 368       FUNCTION_ADDR(entry), 5, p0, p1, p2, p3, p4)) | 370       FUNCTION_ADDR(entry), 5, p0, p1, p2, p3, p4)) | 
| 369 | 371 | 
| 370 #define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6) \ | 372 #define CALL_GENERATED_REGEXP_CODE(entry, p0, p1, p2, p3, p4, p5, p6, p7) \ | 
| 371   Simulator::current()->Call(entry, 8, p0, p1, p2, p3, NULL, p4, p5, p6) | 373   Simulator::current(Isolate::Current())->Call( \ | 
|  | 374       entry, 9, p0, p1, p2, p3, NULL, p4, p5, p6, p7) | 
| 372 | 375 | 
| 373 #define TRY_CATCH_FROM_ADDRESS(try_catch_address) \ | 376 #define TRY_CATCH_FROM_ADDRESS(try_catch_address)                              \ | 
| 374   try_catch_address == \ | 377   try_catch_address == NULL ?                                                  \ | 
| 375       NULL ? NULL : *(reinterpret_cast<TryCatch**>(try_catch_address)) | 378       NULL : *(reinterpret_cast<TryCatch**>(try_catch_address)) | 
| 376 | 379 | 
| 377 | 380 | 
| 378 // The simulator has its own stack. Thus it has a different stack limit from | 381 // The simulator has its own stack. Thus it has a different stack limit from | 
| 379 // the C-based native code.  Setting the c_limit to indicate a very small | 382 // the C-based native code.  Setting the c_limit to indicate a very small | 
| 380 // stack cause stack overflow errors, since the simulator ignores the input. | 383 // stack cause stack overflow errors, since the simulator ignores the input. | 
| 381 // This is unlikely to be an issue in practice, though it might cause testing | 384 // This is unlikely to be an issue in practice, though it might cause testing | 
| 382 // trouble down the line. | 385 // trouble down the line. | 
| 383 class SimulatorStack : public v8::internal::AllStatic { | 386 class SimulatorStack : public v8::internal::AllStatic { | 
| 384  public: | 387  public: | 
| 385   static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) { | 388   static inline uintptr_t JsLimitFromCLimit(uintptr_t c_limit) { | 
| 386     return Simulator::current()->StackLimit(); | 389     return Simulator::current(Isolate::Current())->StackLimit(); | 
| 387   } | 390   } | 
| 388 | 391 | 
| 389   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) { | 392   static inline uintptr_t RegisterCTryCatch(uintptr_t try_catch_address) { | 
| 390     Simulator* sim = Simulator::current(); | 393     Simulator* sim = Simulator::current(Isolate::Current()); | 
| 391     return sim->PushAddress(try_catch_address); | 394     return sim->PushAddress(try_catch_address); | 
| 392   } | 395   } | 
| 393 | 396 | 
| 394   static inline void UnregisterCTryCatch() { | 397   static inline void UnregisterCTryCatch() { | 
| 395     Simulator::current()->PopAddress(); | 398     Simulator::current(Isolate::Current())->PopAddress(); | 
| 396   } | 399   } | 
| 397 }; | 400 }; | 
| 398 | 401 | 
| 399 } }  // namespace v8::internal | 402 } }  // namespace v8::internal | 
| 400 | 403 | 
| 401 #endif  // !defined(USE_SIMULATOR) | 404 #endif  // !defined(USE_SIMULATOR) | 
| 402 #endif  // V8_ARM_SIMULATOR_ARM_H_ | 405 #endif  // V8_ARM_SIMULATOR_ARM_H_ | 
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