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 <android-base/logging.h> 21 22 #include "arch/instruction_set_features.h" 23 #include "base/macros.h" 24 25 namespace art { 26 27 class MipsInstructionSetFeatures; 28 using MipsFeaturesUniquePtr = std::unique_ptr<const MipsInstructionSetFeatures>; 29 30 // Instruction set features relevant to the MIPS architecture. 31 class MipsInstructionSetFeatures final : public InstructionSetFeatures { 32 public: 33 // Process a CPU variant string like "r4000" and create InstructionSetFeatures. 34 static MipsFeaturesUniquePtr FromVariant(const std::string& variant, std::string* error_msg); 35 36 // Parse a bitmap and create an InstructionSetFeatures. 37 static MipsFeaturesUniquePtr FromBitmap(uint32_t bitmap); 38 39 // Turn C pre-processor #defines into the equivalent instruction set features. 40 static MipsFeaturesUniquePtr FromCppDefines(); 41 42 // Process /proc/cpuinfo and use kRuntimeISA to produce InstructionSetFeatures. 43 static MipsFeaturesUniquePtr FromCpuInfo(); 44 45 // Process the auxiliary vector AT_HWCAP entry and use kRuntimeISA to produce 46 // InstructionSetFeatures. 47 static MipsFeaturesUniquePtr FromHwcap(); 48 49 // Use assembly tests of the current runtime (ie kRuntimeISA) to determine the 50 // InstructionSetFeatures. This works around kernel bugs in AT_HWCAP and /proc/cpuinfo. 51 static MipsFeaturesUniquePtr FromAssembly(); 52 53 bool Equals(const InstructionSetFeatures* other) const override; 54 GetInstructionSet()55 InstructionSet GetInstructionSet() const override { 56 return InstructionSet::kMips; 57 } 58 59 uint32_t AsBitmap() const override; 60 61 std::string GetFeatureString() const override; 62 63 // Is this an ISA revision greater than 2 opening up new opcodes. IsMipsIsaRevGreaterThanEqual2()64 bool IsMipsIsaRevGreaterThanEqual2() const { 65 return mips_isa_gte2_; 66 } 67 68 // Floating point double registers are encoded differently based on whether the Status.FR bit is 69 // set. When the FR bit is 0 then the FPU is 32-bit, 1 its 64-bit. Return true if the code should 70 // be generated assuming Status.FR is 0. Is32BitFloatingPoint()71 bool Is32BitFloatingPoint() const { 72 return fpu_32bit_; 73 } 74 IsR6()75 bool IsR6() const { 76 return r6_; 77 } 78 79 // Does it have MSA (MIPS SIMD Architecture) support. HasMsa()80 bool HasMsa() const { 81 return msa_; 82 } 83 ~MipsInstructionSetFeatures()84 virtual ~MipsInstructionSetFeatures() {} 85 86 protected: 87 // Parse a vector of the form "fpu32", "mips2" adding these to a new MipsInstructionSetFeatures. 88 std::unique_ptr<const InstructionSetFeatures> 89 AddFeaturesFromSplitString(const std::vector<std::string>& features, 90 std::string* error_msg) const override; 91 92 private: MipsInstructionSetFeatures(bool fpu_32bit,bool mips_isa_gte2,bool r6,bool msa)93 MipsInstructionSetFeatures(bool fpu_32bit, bool mips_isa_gte2, bool r6, bool msa) 94 : InstructionSetFeatures(), 95 fpu_32bit_(fpu_32bit), 96 mips_isa_gte2_(mips_isa_gte2), 97 r6_(r6), 98 msa_(msa) { 99 // Sanity checks. 100 if (r6) { 101 CHECK(mips_isa_gte2); 102 CHECK(!fpu_32bit); 103 } 104 if (!mips_isa_gte2) { 105 CHECK(fpu_32bit); 106 } 107 } 108 109 // Bitmap positions for encoding features as a bitmap. 110 enum { 111 kFpu32Bitfield = 1 << 0, 112 kIsaRevGte2Bitfield = 1 << 1, 113 kR6 = 1 << 2, 114 kMsaBitfield = 1 << 3, 115 }; 116 117 const bool fpu_32bit_; 118 const bool mips_isa_gte2_; 119 const bool r6_; 120 const bool msa_; 121 122 DISALLOW_COPY_AND_ASSIGN(MipsInstructionSetFeatures); 123 }; 124 125 } // namespace art 126 127 #endif // ART_RUNTIME_ARCH_MIPS_INSTRUCTION_SET_FEATURES_MIPS_H_ 128