| /* |
| * 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 "linker/arm/relative_patcher_arm_base.h" |
| |
| namespace art { |
| namespace linker { |
| |
| class Thumb2RelativePatcher FINAL : public ArmBaseRelativePatcher { |
| public: |
| 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 PatchDexCacheReference(std::vector<uint8_t>* code, const LinkerPatch& patch, |
| uint32_t patch_offset, uint32_t target_offset) OVERRIDE; |
| |
| private: |
| static std::vector<uint8_t> CompileThunkCode(); |
| |
| 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); |
| |
| // PC displacement from patch location; Thumb2 PC is always at instruction address + 4. |
| static constexpr int32_t kPcDisplacement = 4; |
| |
| // Maximum positive and negative displacement measured from the patch location. |
| // (Signed 25 bit displacement with the last bit 0 has range [-2^24, 2^24-2] measured from |
| // the Thumb2 PC pointing right after the BL, i.e. 4 bytes later than the patch location.) |
| static constexpr uint32_t kMaxPositiveDisplacement = (1u << 24) - 2 + kPcDisplacement; |
| static constexpr uint32_t kMaxNegativeDisplacement = (1u << 24) - kPcDisplacement; |
| |
| DISALLOW_COPY_AND_ASSIGN(Thumb2RelativePatcher); |
| }; |
| |
| } // namespace linker |
| } // namespace art |
| |
| #endif // ART_COMPILER_LINKER_ARM_RELATIVE_PATCHER_THUMB2_H_ |