62 lines
2.4 KiB
C++
62 lines
2.4 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_COMPILER_LINKER_ARM_RELATIVE_PATCHER_THUMB2_H_
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#define ART_COMPILER_LINKER_ARM_RELATIVE_PATCHER_THUMB2_H_
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#include "linker/arm/relative_patcher_arm_base.h"
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namespace art {
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namespace linker {
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class Thumb2RelativePatcher FINAL : public ArmBaseRelativePatcher {
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public:
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explicit Thumb2RelativePatcher(RelativePatcherTargetProvider* provider);
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void PatchCall(std::vector<uint8_t>* code,
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uint32_t literal_offset,
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uint32_t patch_offset,
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uint32_t target_offset) OVERRIDE;
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void PatchPcRelativeReference(std::vector<uint8_t>* code,
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const LinkerPatch& patch,
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uint32_t patch_offset,
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uint32_t target_offset) OVERRIDE;
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private:
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static std::vector<uint8_t> CompileThunkCode();
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void SetInsn32(std::vector<uint8_t>* code, uint32_t offset, uint32_t value);
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static uint32_t GetInsn32(ArrayRef<const uint8_t> code, uint32_t offset);
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template <typename Vector>
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static uint32_t GetInsn32(Vector* code, uint32_t offset);
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// PC displacement from patch location; Thumb2 PC is always at instruction address + 4.
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static constexpr int32_t kPcDisplacement = 4;
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// Maximum positive and negative displacement measured from the patch location.
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// (Signed 25 bit displacement with the last bit 0 has range [-2^24, 2^24-2] measured from
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// the Thumb2 PC pointing right after the BL, i.e. 4 bytes later than the patch location.)
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static constexpr uint32_t kMaxPositiveDisplacement = (1u << 24) - 2 + kPcDisplacement;
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static constexpr uint32_t kMaxNegativeDisplacement = (1u << 24) - kPcDisplacement;
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DISALLOW_COPY_AND_ASSIGN(Thumb2RelativePatcher);
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};
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} // namespace linker
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} // namespace art
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#endif // ART_COMPILER_LINKER_ARM_RELATIVE_PATCHER_THUMB2_H_
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