79 lines
3.1 KiB
C++
79 lines
3.1 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_ARM64_RELATIVE_PATCHER_ARM64_H_
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#define ART_COMPILER_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_
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#include "linker/arm/relative_patcher_arm_base.h"
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#include "utils/array_ref.h"
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namespace art {
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namespace linker {
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class Arm64RelativePatcher FINAL : public ArmBaseRelativePatcher {
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public:
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Arm64RelativePatcher(RelativePatcherTargetProvider* provider,
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const Arm64InstructionSetFeatures* features);
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uint32_t ReserveSpace(uint32_t offset,
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const CompiledMethod* compiled_method,
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MethodReference method_ref) OVERRIDE;
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uint32_t ReserveSpaceEnd(uint32_t offset) OVERRIDE;
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uint32_t WriteThunks(OutputStream* out, uint32_t offset) OVERRIDE;
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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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static uint32_t PatchAdrp(uint32_t adrp, uint32_t disp);
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static bool NeedsErratum843419Thunk(ArrayRef<const uint8_t> code, uint32_t literal_offset,
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uint32_t patch_offset);
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void SetInsn(std::vector<uint8_t>* code, uint32_t offset, uint32_t value);
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static uint32_t GetInsn(ArrayRef<const uint8_t> code, uint32_t offset);
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template <typename Alloc>
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static uint32_t GetInsn(std::vector<uint8_t, Alloc>* code, uint32_t offset);
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// Maximum positive and negative displacement measured from the patch location.
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// (Signed 28 bit displacement with the last bit 0 has range [-2^27, 2^27-4] measured from
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// the ARM64 PC pointing to the BL.)
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static constexpr uint32_t kMaxPositiveDisplacement = (1u << 27) - 4u;
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static constexpr uint32_t kMaxNegativeDisplacement = (1u << 27);
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// The ADRP thunk for erratum 843419 is 2 instructions, i.e. 8 bytes.
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static constexpr uint32_t kAdrpThunkSize = 8u;
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const bool fix_cortex_a53_843419_;
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// Map original patch_offset to thunk offset.
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std::vector<std::pair<uint32_t, uint32_t>> adrp_thunk_locations_;
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size_t reserved_adrp_thunks_;
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size_t processed_adrp_thunks_;
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std::vector<uint8_t> current_method_thunks_;
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DISALLOW_COPY_AND_ASSIGN(Arm64RelativePatcher);
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};
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} // namespace linker
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} // namespace art
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#endif // ART_COMPILER_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_
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