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| 1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 | 5 |
| 6 // Declares a Simulator for MIPS instructions if we are not generating a native | 6 // Declares a Simulator for MIPS instructions if we are not generating a native |
| 7 // MIPS binary. This Simulator allows us to run and debug MIPS code generation | 7 // MIPS binary. This Simulator allows us to run and debug MIPS code generation |
| 8 // on regular desktop machines. | 8 // on regular desktop machines. |
| 9 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro, | 9 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro, |
| 10 // which will start execution in the Simulator or forwards to the real entry | 10 // which will start execution in the Simulator or forwards to the real entry |
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| 68 // NOTE: The check for overflow is not safe as there is no guarantee that the | 68 // NOTE: The check for overflow is not safe as there is no guarantee that the |
| 69 // running thread has its stack in all memory up to address 0x00000000. | 69 // running thread has its stack in all memory up to address 0x00000000. |
| 70 #define GENERATED_CODE_STACK_LIMIT(limit) \ | 70 #define GENERATED_CODE_STACK_LIMIT(limit) \ |
| 71 (reinterpret_cast<uintptr_t>(this) >= limit ? \ | 71 (reinterpret_cast<uintptr_t>(this) >= limit ? \ |
| 72 reinterpret_cast<uintptr_t>(this) - limit : 0) | 72 reinterpret_cast<uintptr_t>(this) - limit : 0) |
| 73 | 73 |
| 74 #else // !defined(USE_SIMULATOR) | 74 #else // !defined(USE_SIMULATOR) |
| 75 // Running with a simulator. | 75 // Running with a simulator. |
| 76 | 76 |
| 77 #include "src/assembler.h" | 77 #include "src/assembler.h" |
| 78 #include "src/hashmap.h" | 78 #include "src/base/hashmap.h" |
| 79 | 79 |
| 80 namespace v8 { | 80 namespace v8 { |
| 81 namespace internal { | 81 namespace internal { |
| 82 | 82 |
| 83 // ----------------------------------------------------------------------------- | 83 // ----------------------------------------------------------------------------- |
| 84 // Utility functions | 84 // Utility functions |
| 85 | 85 |
| 86 class CachePage { | 86 class CachePage { |
| 87 public: | 87 public: |
| 88 static const int LINE_VALID = 0; | 88 static const int LINE_VALID = 0; |
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| 209 | 209 |
| 210 // Accessor to the internal simulator stack area. | 210 // Accessor to the internal simulator stack area. |
| 211 uintptr_t StackLimit(uintptr_t c_limit) const; | 211 uintptr_t StackLimit(uintptr_t c_limit) const; |
| 212 | 212 |
| 213 // Executes MIPS instructions until the PC reaches end_sim_pc. | 213 // Executes MIPS instructions until the PC reaches end_sim_pc. |
| 214 void Execute(); | 214 void Execute(); |
| 215 | 215 |
| 216 // Call on program start. | 216 // Call on program start. |
| 217 static void Initialize(Isolate* isolate); | 217 static void Initialize(Isolate* isolate); |
| 218 | 218 |
| 219 static void TearDown(HashMap* i_cache, Redirection* first); | 219 static void TearDown(base::HashMap* i_cache, Redirection* first); |
| 220 | 220 |
| 221 // V8 generally calls into generated JS code with 5 parameters and into | 221 // V8 generally calls into generated JS code with 5 parameters and into |
| 222 // generated RegExp code with 7 parameters. This is a convenience function, | 222 // generated RegExp code with 7 parameters. This is a convenience function, |
| 223 // which sets up the simulator state and grabs the result on return. | 223 // which sets up the simulator state and grabs the result on return. |
| 224 int32_t Call(byte* entry, int argument_count, ...); | 224 int32_t Call(byte* entry, int argument_count, ...); |
| 225 // Alternative: call a 2-argument double function. | 225 // Alternative: call a 2-argument double function. |
| 226 double CallFP(byte* entry, double d0, double d1); | 226 double CallFP(byte* entry, double d0, double d1); |
| 227 | 227 |
| 228 // Push an address onto the JS stack. | 228 // Push an address onto the JS stack. |
| 229 uintptr_t PushAddress(uintptr_t address); | 229 uintptr_t PushAddress(uintptr_t address); |
| 230 | 230 |
| 231 // Pop an address from the JS stack. | 231 // Pop an address from the JS stack. |
| 232 uintptr_t PopAddress(); | 232 uintptr_t PopAddress(); |
| 233 | 233 |
| 234 // Debugger input. | 234 // Debugger input. |
| 235 void set_last_debugger_input(char* input); | 235 void set_last_debugger_input(char* input); |
| 236 char* last_debugger_input() { return last_debugger_input_; } | 236 char* last_debugger_input() { return last_debugger_input_; } |
| 237 | 237 |
| 238 // ICache checking. | 238 // ICache checking. |
| 239 static void FlushICache(v8::internal::HashMap* i_cache, void* start, | 239 static void FlushICache(base::HashMap* i_cache, void* start, size_t size); |
| 240 size_t size); | |
| 241 | 240 |
| 242 // Returns true if pc register contains one of the 'special_values' defined | 241 // Returns true if pc register contains one of the 'special_values' defined |
| 243 // below (bad_ra, end_sim_pc). | 242 // below (bad_ra, end_sim_pc). |
| 244 bool has_bad_pc() const; | 243 bool has_bad_pc() const; |
| 245 | 244 |
| 246 private: | 245 private: |
| 247 enum special_values { | 246 enum special_values { |
| 248 // Known bad pc value to ensure that the simulator does not execute | 247 // Known bad pc value to ensure that the simulator does not execute |
| 249 // without being properly setup. | 248 // without being properly setup. |
| 250 bad_ra = -1, | 249 bad_ra = -1, |
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| 394 if (instr->IsForbiddenInBranchDelay()) { | 393 if (instr->IsForbiddenInBranchDelay()) { |
| 395 V8_Fatal(__FILE__, __LINE__, | 394 V8_Fatal(__FILE__, __LINE__, |
| 396 "Eror:Unexpected %i opcode in a branch delay slot.", | 395 "Eror:Unexpected %i opcode in a branch delay slot.", |
| 397 instr->OpcodeValue()); | 396 instr->OpcodeValue()); |
| 398 } | 397 } |
| 399 InstructionDecode(instr); | 398 InstructionDecode(instr); |
| 400 SNPrintF(trace_buf_, " "); | 399 SNPrintF(trace_buf_, " "); |
| 401 } | 400 } |
| 402 | 401 |
| 403 // ICache. | 402 // ICache. |
| 404 static void CheckICache(v8::internal::HashMap* i_cache, Instruction* instr); | 403 static void CheckICache(base::HashMap* i_cache, Instruction* instr); |
| 405 static void FlushOnePage(v8::internal::HashMap* i_cache, intptr_t start, | 404 static void FlushOnePage(base::HashMap* i_cache, intptr_t start, int size); |
| 406 int size); | 405 static CachePage* GetCachePage(base::HashMap* i_cache, void* page); |
| 407 static CachePage* GetCachePage(v8::internal::HashMap* i_cache, void* page); | |
| 408 | 406 |
| 409 enum Exception { | 407 enum Exception { |
| 410 none, | 408 none, |
| 411 kIntegerOverflow, | 409 kIntegerOverflow, |
| 412 kIntegerUnderflow, | 410 kIntegerUnderflow, |
| 413 kDivideByZero, | 411 kDivideByZero, |
| 414 kNumExceptions | 412 kNumExceptions |
| 415 }; | 413 }; |
| 416 | 414 |
| 417 // Exceptions. | 415 // Exceptions. |
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| 443 static const size_t stack_size_ = 1 * 1024*1024; | 441 static const size_t stack_size_ = 1 * 1024*1024; |
| 444 char* stack_; | 442 char* stack_; |
| 445 bool pc_modified_; | 443 bool pc_modified_; |
| 446 uint64_t icount_; | 444 uint64_t icount_; |
| 447 int break_count_; | 445 int break_count_; |
| 448 | 446 |
| 449 // Debugger input. | 447 // Debugger input. |
| 450 char* last_debugger_input_; | 448 char* last_debugger_input_; |
| 451 | 449 |
| 452 // Icache simulation. | 450 // Icache simulation. |
| 453 v8::internal::HashMap* i_cache_; | 451 base::HashMap* i_cache_; |
| 454 | 452 |
| 455 v8::internal::Isolate* isolate_; | 453 v8::internal::Isolate* isolate_; |
| 456 | 454 |
| 457 // Registered breakpoints. | 455 // Registered breakpoints. |
| 458 Instruction* break_pc_; | 456 Instruction* break_pc_; |
| 459 Instr break_instr_; | 457 Instr break_instr_; |
| 460 | 458 |
| 461 // Stop is disabled if bit 31 is set. | 459 // Stop is disabled if bit 31 is set. |
| 462 static const uint32_t kStopDisabledBit = 1 << 31; | 460 static const uint32_t kStopDisabledBit = 1 << 31; |
| 463 | 461 |
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| 505 static inline void UnregisterCTryCatch(Isolate* isolate) { | 503 static inline void UnregisterCTryCatch(Isolate* isolate) { |
| 506 Simulator::current(isolate)->PopAddress(); | 504 Simulator::current(isolate)->PopAddress(); |
| 507 } | 505 } |
| 508 }; | 506 }; |
| 509 | 507 |
| 510 } // namespace internal | 508 } // namespace internal |
| 511 } // namespace v8 | 509 } // namespace v8 |
| 512 | 510 |
| 513 #endif // !defined(USE_SIMULATOR) | 511 #endif // !defined(USE_SIMULATOR) |
| 514 #endif // V8_MIPS_SIMULATOR_MIPS_H_ | 512 #endif // V8_MIPS_SIMULATOR_MIPS_H_ |
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