1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_ARCH_MIPS_INSTRUCTION_SET_FEATURES_MIPS_H_ 18 #define ART_RUNTIME_ARCH_MIPS_INSTRUCTION_SET_FEATURES_MIPS_H_ 19 20 #include "arch/instruction_set_features.h" 21 22 namespace art { 23 24 // Instruction set features relevant to the MIPS architecture. 25 class MipsInstructionSetFeatures FINAL : public InstructionSetFeatures { 26 public: 27 // Process a CPU variant string like "r4000" and create InstructionSetFeatures. 28 static const MipsInstructionSetFeatures* FromVariant(const std::string& variant, 29 std::string* error_msg); 30 31 // Parse a bitmap and create an InstructionSetFeatures. 32 static const MipsInstructionSetFeatures* FromBitmap(uint32_t bitmap); 33 34 // Turn C pre-processor #defines into the equivalent instruction set features. 35 static const MipsInstructionSetFeatures* FromCppDefines(); 36 37 // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures. 38 static const MipsInstructionSetFeatures* FromCpuInfo(); 39 40 // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce 41 // InstructionSetFeatures. 42 static const MipsInstructionSetFeatures* FromHwcap(); 43 44 // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the 45 // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo. 46 static const MipsInstructionSetFeatures* FromAssembly(); 47 48 bool Equals(const InstructionSetFeatures* other) const OVERRIDE; 49 GetInstructionSet()50 InstructionSet GetInstructionSet() const OVERRIDE { 51 return kMips; 52 } 53 54 uint32_t AsBitmap() const OVERRIDE; 55 56 std::string GetFeatureString() const OVERRIDE; 57 58 // Is this an ISA revision greater than 2 opening up new opcodes. IsMipsIsaRevGreaterThanEqual2()59 bool IsMipsIsaRevGreaterThanEqual2() const { 60 return mips_isa_gte2_; 61 } 62 63 // Floating point double registers are encoded differently based on whether the Status.FR bit is 64 // set. When the FR bit is 0 then the FPU is 32-bit, 1 its 64-bit. Return true if the code should 65 // be generated assuming Status.FR is 0. Is32BitFloatingPoint()66 bool Is32BitFloatingPoint() const { 67 return fpu_32bit_; 68 } 69 IsR6()70 bool IsR6() const { 71 return r6_; 72 } 73 ~MipsInstructionSetFeatures()74 virtual ~MipsInstructionSetFeatures() {} 75 76 protected: 77 // Parse a vector of the form "fpu32", "mips2" adding these to a new MipsInstructionSetFeatures. 78 virtual const InstructionSetFeatures* 79 AddFeaturesFromSplitString(const bool smp, const std::vector<std::string>& features, 80 std::string* error_msg) const OVERRIDE; 81 82 private: MipsInstructionSetFeatures(bool smp,bool fpu_32bit,bool mips_isa_gte2,bool r6)83 MipsInstructionSetFeatures(bool smp, bool fpu_32bit, bool mips_isa_gte2, bool r6) 84 : InstructionSetFeatures(smp), fpu_32bit_(fpu_32bit), mips_isa_gte2_(mips_isa_gte2), r6_(r6) 85 {} 86 87 // Bitmap positions for encoding features as a bitmap. 88 enum { 89 kSmpBitfield = 1, 90 kFpu32Bitfield = 2, 91 kIsaRevGte2Bitfield = 4, 92 kR6 = 8, 93 }; 94 95 const bool fpu_32bit_; 96 const bool mips_isa_gte2_; 97 const bool r6_; 98 99 DISALLOW_COPY_AND_ASSIGN(MipsInstructionSetFeatures); 100 }; 101 102 } // namespace art 103 104 #endif // ART_RUNTIME_ARCH_MIPS_INSTRUCTION_SET_FEATURES_MIPS_H_ 105