| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef ART_COMPILER_LINKER_ARM_RELATIVE_PATCHER_THUMB2_H_ |
| #define ART_COMPILER_LINKER_ARM_RELATIVE_PATCHER_THUMB2_H_ |
| |
| #include "arch/arm/registers_arm.h" |
| #include "base/array_ref.h" |
| #include "base/bit_field.h" |
| #include "base/bit_utils.h" |
| #include "linker/arm/relative_patcher_arm_base.h" |
| |
| namespace art { |
| |
| namespace arm { |
| class ArmVIXLAssembler; |
| } // namespace arm |
| |
| namespace linker { |
| |
| class Thumb2RelativePatcher FINAL : public ArmBaseRelativePatcher { |
| public: |
| static constexpr uint32_t kBakerCcEntrypointRegister = 4u; |
| |
| static uint32_t EncodeBakerReadBarrierFieldData(uint32_t base_reg, |
| uint32_t holder_reg, |
| bool narrow) { |
| CheckValidReg(base_reg); |
| CheckValidReg(holder_reg); |
| DCHECK(!narrow || base_reg < 8u) << base_reg; |
| BakerReadBarrierWidth width = |
| narrow ? BakerReadBarrierWidth::kNarrow : BakerReadBarrierWidth::kWide; |
| return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kField) | |
| BakerReadBarrierFirstRegField::Encode(base_reg) | |
| BakerReadBarrierSecondRegField::Encode(holder_reg) | |
| BakerReadBarrierWidthField::Encode(width); |
| } |
| |
| static uint32_t EncodeBakerReadBarrierArrayData(uint32_t base_reg) { |
| CheckValidReg(base_reg); |
| return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kArray) | |
| BakerReadBarrierFirstRegField::Encode(base_reg) | |
| BakerReadBarrierSecondRegField::Encode(kInvalidEncodedReg) | |
| BakerReadBarrierWidthField::Encode(BakerReadBarrierWidth::kWide); |
| } |
| |
| static uint32_t EncodeBakerReadBarrierGcRootData(uint32_t root_reg, bool narrow) { |
| CheckValidReg(root_reg); |
| DCHECK(!narrow || root_reg < 8u) << root_reg; |
| BakerReadBarrierWidth width = |
| narrow ? BakerReadBarrierWidth::kNarrow : BakerReadBarrierWidth::kWide; |
| return BakerReadBarrierKindField::Encode(BakerReadBarrierKind::kGcRoot) | |
| BakerReadBarrierFirstRegField::Encode(root_reg) | |
| BakerReadBarrierSecondRegField::Encode(kInvalidEncodedReg) | |
| BakerReadBarrierWidthField::Encode(width); |
| } |
| |
| explicit Thumb2RelativePatcher(RelativePatcherTargetProvider* provider); |
| |
| void PatchCall(std::vector<uint8_t>* code, |
| uint32_t literal_offset, |
| uint32_t patch_offset, |
| uint32_t target_offset) OVERRIDE; |
| void PatchPcRelativeReference(std::vector<uint8_t>* code, |
| const LinkerPatch& patch, |
| uint32_t patch_offset, |
| uint32_t target_offset) OVERRIDE; |
| void PatchBakerReadBarrierBranch(std::vector<uint8_t>* code, |
| const LinkerPatch& patch, |
| uint32_t patch_offset) OVERRIDE; |
| |
| protected: |
| std::vector<uint8_t> CompileThunk(const ThunkKey& key) OVERRIDE; |
| std::string GetThunkDebugName(const ThunkKey& key) OVERRIDE; |
| uint32_t MaxPositiveDisplacement(const ThunkKey& key) OVERRIDE; |
| uint32_t MaxNegativeDisplacement(const ThunkKey& key) OVERRIDE; |
| |
| private: |
| static constexpr uint32_t kInvalidEncodedReg = /* pc is invalid */ 15u; |
| |
| enum class BakerReadBarrierKind : uint8_t { |
| kField, // Field get or array get with constant offset (i.e. constant index). |
| kArray, // Array get with index in register. |
| kGcRoot, // GC root load. |
| kLast = kGcRoot |
| }; |
| |
| enum class BakerReadBarrierWidth : uint8_t { |
| kWide, // 32-bit LDR (and 32-bit NEG if heap poisoning is enabled). |
| kNarrow, // 16-bit LDR (and 16-bit NEG if heap poisoning is enabled). |
| kLast = kNarrow |
| }; |
| |
| static constexpr size_t kBitsForBakerReadBarrierKind = |
| MinimumBitsToStore(static_cast<size_t>(BakerReadBarrierKind::kLast)); |
| static constexpr size_t kBitsForRegister = 4u; |
| using BakerReadBarrierKindField = |
| BitField<BakerReadBarrierKind, 0, kBitsForBakerReadBarrierKind>; |
| using BakerReadBarrierFirstRegField = |
| BitField<uint32_t, kBitsForBakerReadBarrierKind, kBitsForRegister>; |
| using BakerReadBarrierSecondRegField = |
| BitField<uint32_t, kBitsForBakerReadBarrierKind + kBitsForRegister, kBitsForRegister>; |
| static constexpr size_t kBitsForBakerReadBarrierWidth = |
| MinimumBitsToStore(static_cast<size_t>(BakerReadBarrierWidth::kLast)); |
| using BakerReadBarrierWidthField = BitField<BakerReadBarrierWidth, |
| kBitsForBakerReadBarrierKind + 2 * kBitsForRegister, |
| kBitsForBakerReadBarrierWidth>; |
| |
| static void CheckValidReg(uint32_t reg) { |
| DCHECK(reg < 12u && reg != kBakerCcEntrypointRegister) << reg; |
| } |
| |
| void CompileBakerReadBarrierThunk(arm::ArmVIXLAssembler& assembler, uint32_t encoded_data); |
| |
| void SetInsn32(std::vector<uint8_t>* code, uint32_t offset, uint32_t value); |
| static uint32_t GetInsn32(ArrayRef<const uint8_t> code, uint32_t offset); |
| |
| template <typename Vector> |
| static uint32_t GetInsn32(Vector* code, uint32_t offset); |
| |
| static uint32_t GetInsn16(ArrayRef<const uint8_t> code, uint32_t offset); |
| |
| template <typename Vector> |
| static uint32_t GetInsn16(Vector* code, uint32_t offset); |
| |
| friend class Thumb2RelativePatcherTest; |
| |
| DISALLOW_COPY_AND_ASSIGN(Thumb2RelativePatcher); |
| }; |
| |
| } // namespace linker |
| } // namespace art |
| |
| #endif // ART_COMPILER_LINKER_ARM_RELATIVE_PATCHER_THUMB2_H_ |