1 /* 2 * Copyright (C) 2015 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_COMPILER_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_ 18 #define ART_COMPILER_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_ 19 20 #include "base/array_ref.h" 21 #include "base/bit_field.h" 22 #include "linker/arm/relative_patcher_arm_base.h" 23 24 namespace art { 25 namespace linker { 26 27 class Arm64RelativePatcher FINAL : public ArmBaseRelativePatcher { 28 public: 29 enum class BakerReadBarrierKind : uint8_t { 30 kField, // Field get or array get with constant offset (i.e. constant index). 31 kGcRoot, // GC root load. 32 kLast 33 }; 34 EncodeBakerReadBarrierFieldData(uint32_t base_reg,uint32_t holder_reg)35 static uint32_t EncodeBakerReadBarrierFieldData(uint32_t base_reg, uint32_t holder_reg) { 36 CheckValidReg(base_reg); 37 CheckValidReg(holder_reg); 38 return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kField) | 39 BakerReadBarrierFirstRegField::Encode(base_reg) | 40 BakerReadBarrierSecondRegField::Encode(holder_reg); 41 } 42 EncodeBakerReadBarrierGcRootData(uint32_t root_reg)43 static uint32_t EncodeBakerReadBarrierGcRootData(uint32_t root_reg) { 44 CheckValidReg(root_reg); 45 return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kGcRoot) | 46 BakerReadBarrierFirstRegField::Encode(root_reg) | 47 BakerReadBarrierSecondRegField::Encode(kInvalidEncodedReg); 48 } 49 50 Arm64RelativePatcher(RelativePatcherTargetProvider* provider, 51 const Arm64InstructionSetFeatures* features); 52 53 uint32_t ReserveSpace(uint32_t offset, 54 const CompiledMethod* compiled_method, 55 MethodReference method_ref) OVERRIDE; 56 uint32_t ReserveSpaceEnd(uint32_t offset) OVERRIDE; 57 uint32_t WriteThunks(OutputStream* out, uint32_t offset) OVERRIDE; 58 void PatchCall(std::vector<uint8_t>* code, 59 uint32_t literal_offset, 60 uint32_t patch_offset, 61 uint32_t target_offset) OVERRIDE; 62 void PatchPcRelativeReference(std::vector<uint8_t>* code, 63 const LinkerPatch& patch, 64 uint32_t patch_offset, 65 uint32_t target_offset) OVERRIDE; 66 void PatchBakerReadBarrierBranch(std::vector<uint8_t>* code, 67 const LinkerPatch& patch, 68 uint32_t patch_offset) OVERRIDE; 69 70 protected: 71 static constexpr uint32_t kInvalidEncodedReg = /* sp/zr is invalid */ 31u; 72 73 ThunkKey GetBakerReadBarrierKey(const LinkerPatch& patch) OVERRIDE; 74 std::vector<uint8_t> CompileThunk(const ThunkKey& key) OVERRIDE; 75 uint32_t MaxPositiveDisplacement(ThunkType type) OVERRIDE; 76 uint32_t MaxNegativeDisplacement(ThunkType type) OVERRIDE; 77 78 private: 79 static constexpr size_t kBitsForBakerReadBarrierKind = 80 MinimumBitsToStore(static_cast<size_t>(BakerReadBarrierKind::kLast)); 81 static constexpr size_t kBitsForRegister = 5u; 82 using BakerReadBarrierKindField = 83 BitField<BakerReadBarrierKind, 0, kBitsForBakerReadBarrierKind>; 84 using BakerReadBarrierFirstRegField = 85 BitField<uint32_t, kBitsForBakerReadBarrierKind, kBitsForRegister>; 86 using BakerReadBarrierSecondRegField = 87 BitField<uint32_t, kBitsForBakerReadBarrierKind + kBitsForRegister, kBitsForRegister>; 88 CheckValidReg(uint32_t reg)89 static void CheckValidReg(uint32_t reg) { 90 DCHECK(reg < 30u && reg != 16u && reg != 17u); 91 } 92 93 static uint32_t PatchAdrp(uint32_t adrp, uint32_t disp); 94 95 static bool NeedsErratum843419Thunk(ArrayRef<const uint8_t> code, uint32_t literal_offset, 96 uint32_t patch_offset); 97 void SetInsn(std::vector<uint8_t>* code, uint32_t offset, uint32_t value); 98 static uint32_t GetInsn(ArrayRef<const uint8_t> code, uint32_t offset); 99 100 template <typename Alloc> 101 static uint32_t GetInsn(std::vector<uint8_t, Alloc>* code, uint32_t offset); 102 103 const bool fix_cortex_a53_843419_; 104 // Map original patch_offset to thunk offset. 105 std::vector<std::pair<uint32_t, uint32_t>> adrp_thunk_locations_; 106 size_t reserved_adrp_thunks_; 107 size_t processed_adrp_thunks_; 108 std::vector<uint8_t> current_method_thunks_; 109 110 friend class Arm64RelativePatcherTest; 111 112 DISALLOW_COPY_AND_ASSIGN(Arm64RelativePatcher); 113 }; 114 115 } // namespace linker 116 } // namespace art 117 118 #endif // ART_COMPILER_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_ 119