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