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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 // 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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| 80 | 80 |
| 81 // Using blx may yield better code, so use it when required or when available | 81 // Using blx may yield better code, so use it when required or when available |
| 82 #if defined(USE_THUMB_INTERWORK) || defined(CAN_USE_ARMV5_INSTRUCTIONS) | 82 #if defined(USE_THUMB_INTERWORK) || defined(CAN_USE_ARMV5_INSTRUCTIONS) |
| 83 #define USE_BLX 1 | 83 #define USE_BLX 1 |
| 84 #endif | 84 #endif |
| 85 | 85 |
| 86 namespace v8 { | 86 namespace v8 { |
| 87 namespace internal { | 87 namespace internal { |
| 88 | 88 |
| 89 // Constant pool marker. | 89 // Constant pool marker. |
| 90 static const int kConstantPoolMarkerMask = 0xffe00000; | 90 const int kConstantPoolMarkerMask = 0xffe00000; |
| 91 static const int kConstantPoolMarker = 0x0c000000; | 91 const int kConstantPoolMarker = 0x0c000000; |
| 92 static const int kConstantPoolLengthMask = 0x001ffff; | 92 const int kConstantPoolLengthMask = 0x001ffff; |
| 93 | 93 |
| 94 // Number of registers in normal ARM mode. | 94 // Number of registers in normal ARM mode. |
| 95 static const int kNumRegisters = 16; | 95 const int kNumRegisters = 16; |
| 96 | 96 |
| 97 // VFP support. | 97 // VFP support. |
| 98 static const int kNumVFPSingleRegisters = 32; | 98 const int kNumVFPSingleRegisters = 32; |
| 99 static const int kNumVFPDoubleRegisters = 16; | 99 const int kNumVFPDoubleRegisters = 16; |
| 100 static const int kNumVFPRegisters = | 100 const int kNumVFPRegisters = kNumVFPSingleRegisters + kNumVFPDoubleRegisters; |
| 101 kNumVFPSingleRegisters + kNumVFPDoubleRegisters; | |
| 102 | 101 |
| 103 // PC is register 15. | 102 // PC is register 15. |
| 104 static const int kPCRegister = 15; | 103 const int kPCRegister = 15; |
| 105 static const int kNoRegister = -1; | 104 const int kNoRegister = -1; |
| 106 | 105 |
| 107 // ----------------------------------------------------------------------------- | 106 // ----------------------------------------------------------------------------- |
| 108 // Conditions. | 107 // Conditions. |
| 109 | 108 |
| 110 // Defines constants and accessor classes to assemble, disassemble and | 109 // Defines constants and accessor classes to assemble, disassemble and |
| 111 // simulate ARM instructions. | 110 // simulate ARM instructions. |
| 112 // | 111 // |
| 113 // Section references in the code refer to the "ARM Architecture Reference | 112 // Section references in the code refer to the "ARM Architecture Reference |
| 114 // Manual" from July 2005 (available at http://www.arm.com/miscPDFs/14128.pdf) | 113 // Manual" from July 2005 (available at http://www.arm.com/miscPDFs/14128.pdf) |
| 115 // | 114 // |
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| 364 // svc (formerly swi) provides a 24bit immediate value. Use bits 22:0 for | 363 // svc (formerly swi) provides a 24bit immediate value. Use bits 22:0 for |
| 365 // standard SoftwareInterrupCode. Bit 23 is reserved for the stop feature. | 364 // standard SoftwareInterrupCode. Bit 23 is reserved for the stop feature. |
| 366 enum SoftwareInterruptCodes { | 365 enum SoftwareInterruptCodes { |
| 367 // transition to C code | 366 // transition to C code |
| 368 kCallRtRedirected= 0x10, | 367 kCallRtRedirected= 0x10, |
| 369 // break point | 368 // break point |
| 370 kBreakpoint= 0x20, | 369 kBreakpoint= 0x20, |
| 371 // stop | 370 // stop |
| 372 kStopCode = 1 << 23 | 371 kStopCode = 1 << 23 |
| 373 }; | 372 }; |
| 374 static const uint32_t kStopCodeMask = kStopCode - 1; | 373 const uint32_t kStopCodeMask = kStopCode - 1; |
| 375 static const uint32_t kMaxStopCode = kStopCode - 1; | 374 const uint32_t kMaxStopCode = kStopCode - 1; |
| 376 static const int32_t kDefaultStopCode = -1; | 375 const int32_t kDefaultStopCode = -1; |
| 377 | 376 |
| 378 | 377 |
| 379 // Type of VFP register. Determines register encoding. | 378 // Type of VFP register. Determines register encoding. |
| 380 enum VFPRegPrecision { | 379 enum VFPRegPrecision { |
| 381 kSinglePrecision = 0, | 380 kSinglePrecision = 0, |
| 382 kDoublePrecision = 1 | 381 kDoublePrecision = 1 |
| 383 }; | 382 }; |
| 384 | 383 |
| 385 | 384 |
| 386 // VFP FPSCR constants. | 385 // VFP FPSCR constants. |
| 387 enum VFPConversionMode { | 386 enum VFPConversionMode { |
| 388 kFPSCRRounding = 0, | 387 kFPSCRRounding = 0, |
| 389 kDefaultRoundToZero = 1 | 388 kDefaultRoundToZero = 1 |
| 390 }; | 389 }; |
| 391 | 390 |
| 392 // This mask does not include the "inexact" or "input denormal" cumulative | 391 // This mask does not include the "inexact" or "input denormal" cumulative |
| 393 // exceptions flags, because we usually don't want to check for it. | 392 // exceptions flags, because we usually don't want to check for it. |
| 394 static const uint32_t kVFPExceptionMask = 0xf; | 393 const uint32_t kVFPExceptionMask = 0xf; |
| 395 static const uint32_t kVFPInvalidOpExceptionBit = 1 << 0; | 394 const uint32_t kVFPInvalidOpExceptionBit = 1 << 0; |
| 396 static const uint32_t kVFPOverflowExceptionBit = 1 << 2; | 395 const uint32_t kVFPOverflowExceptionBit = 1 << 2; |
| 397 static const uint32_t kVFPUnderflowExceptionBit = 1 << 3; | 396 const uint32_t kVFPUnderflowExceptionBit = 1 << 3; |
| 398 static const uint32_t kVFPInexactExceptionBit = 1 << 4; | 397 const uint32_t kVFPInexactExceptionBit = 1 << 4; |
| 399 static const uint32_t kVFPFlushToZeroMask = 1 << 24; | 398 const uint32_t kVFPFlushToZeroMask = 1 << 24; |
| 400 | 399 |
| 401 static const uint32_t kVFPNConditionFlagBit = 1 << 31; | 400 const uint32_t kVFPNConditionFlagBit = 1 << 31; |
| 402 static const uint32_t kVFPZConditionFlagBit = 1 << 30; | 401 const uint32_t kVFPZConditionFlagBit = 1 << 30; |
| 403 static const uint32_t kVFPCConditionFlagBit = 1 << 29; | 402 const uint32_t kVFPCConditionFlagBit = 1 << 29; |
| 404 static const uint32_t kVFPVConditionFlagBit = 1 << 28; | 403 const uint32_t kVFPVConditionFlagBit = 1 << 28; |
| 405 | 404 |
| 406 | 405 |
| 407 // VFP rounding modes. See ARM DDI 0406B Page A2-29. | 406 // VFP rounding modes. See ARM DDI 0406B Page A2-29. |
| 408 enum VFPRoundingMode { | 407 enum VFPRoundingMode { |
| 409 RN = 0 << 22, // Round to Nearest. | 408 RN = 0 << 22, // Round to Nearest. |
| 410 RP = 1 << 22, // Round towards Plus Infinity. | 409 RP = 1 << 22, // Round towards Plus Infinity. |
| 411 RM = 2 << 22, // Round towards Minus Infinity. | 410 RM = 2 << 22, // Round towards Minus Infinity. |
| 412 RZ = 3 << 22, // Round towards zero. | 411 RZ = 3 << 22, // Round towards zero. |
| 413 | 412 |
| 414 // Aliases. | 413 // Aliases. |
| 415 kRoundToNearest = RN, | 414 kRoundToNearest = RN, |
| 416 kRoundToPlusInf = RP, | 415 kRoundToPlusInf = RP, |
| 417 kRoundToMinusInf = RM, | 416 kRoundToMinusInf = RM, |
| 418 kRoundToZero = RZ | 417 kRoundToZero = RZ |
| 419 }; | 418 }; |
| 420 | 419 |
| 421 static const uint32_t kVFPRoundingModeMask = 3 << 22; | 420 const uint32_t kVFPRoundingModeMask = 3 << 22; |
| 422 | 421 |
| 423 enum CheckForInexactConversion { | 422 enum CheckForInexactConversion { |
| 424 kCheckForInexactConversion, | 423 kCheckForInexactConversion, |
| 425 kDontCheckForInexactConversion | 424 kDontCheckForInexactConversion |
| 426 }; | 425 }; |
| 427 | 426 |
| 428 // ----------------------------------------------------------------------------- | 427 // ----------------------------------------------------------------------------- |
| 429 // Hints. | 428 // Hints. |
| 430 | 429 |
| 431 // Branch hints are not used on the ARM. They are defined so that they can | 430 // Branch hints are not used on the ARM. They are defined so that they can |
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| 766 static int Number(const char* name, bool* is_double); | 765 static int Number(const char* name, bool* is_double); |
| 767 | 766 |
| 768 private: | 767 private: |
| 769 static const char* names_[kNumVFPRegisters]; | 768 static const char* names_[kNumVFPRegisters]; |
| 770 }; | 769 }; |
| 771 | 770 |
| 772 | 771 |
| 773 } } // namespace v8::internal | 772 } } // namespace v8::internal |
| 774 | 773 |
| 775 #endif // V8_ARM_CONSTANTS_ARM_H_ | 774 #endif // V8_ARM_CONSTANTS_ARM_H_ |
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