1 /*
2  * Copyright (C) 2015 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef ART_DEX2OAT_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_
18 #define ART_DEX2OAT_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_
19 
20 #include "base/array_ref.h"
21 #include "linker/arm/relative_patcher_arm_base.h"
22 
23 namespace art {
24 
25 namespace linker {
26 
27 class Arm64RelativePatcher final : public ArmBaseRelativePatcher {
28  public:
29   Arm64RelativePatcher(RelativePatcherThunkProvider* thunk_provider,
30                        RelativePatcherTargetProvider* target_provider,
31                        const Arm64InstructionSetFeatures* features);
32 
33   uint32_t ReserveSpace(uint32_t offset,
34                         const CompiledMethod* compiled_method,
35                         MethodReference method_ref) override;
36   uint32_t ReserveSpaceEnd(uint32_t offset) override;
37   uint32_t WriteThunks(OutputStream* out, uint32_t offset) override;
38   void PatchCall(std::vector<uint8_t>* code,
39                  uint32_t literal_offset,
40                  uint32_t patch_offset,
41                  uint32_t target_offset) override;
42   void PatchPcRelativeReference(std::vector<uint8_t>* code,
43                                 const LinkerPatch& patch,
44                                 uint32_t patch_offset,
45                                 uint32_t target_offset) override;
46   void PatchEntrypointCall(std::vector<uint8_t>* code,
47                            const LinkerPatch& patch,
48                            uint32_t patch_offset) override;
49   void PatchBakerReadBarrierBranch(std::vector<uint8_t>* code,
50                                    const LinkerPatch& patch,
51                                    uint32_t patch_offset) override;
52 
53  protected:
54   uint32_t MaxPositiveDisplacement(const ThunkKey& key) override;
55   uint32_t MaxNegativeDisplacement(const ThunkKey& key) override;
56 
57  private:
58   static uint32_t PatchAdrp(uint32_t adrp, uint32_t disp);
59   static void PatchBl(std::vector<uint8_t>* code, uint32_t literal_offset, uint32_t displacement);
60 
61   static bool NeedsErratum843419Thunk(ArrayRef<const uint8_t> code, uint32_t literal_offset,
62                                       uint32_t patch_offset);
63   static void SetInsn(std::vector<uint8_t>* code, uint32_t offset, uint32_t value);
64   static uint32_t GetInsn(ArrayRef<const uint8_t> code, uint32_t offset);
65 
66   template <typename Alloc>
67   static uint32_t GetInsn(std::vector<uint8_t, Alloc>* code, uint32_t offset);
68 
69   const bool fix_cortex_a53_843419_;
70   // Map original patch_offset to thunk offset.
71   std::vector<std::pair<uint32_t, uint32_t>> adrp_thunk_locations_;
72   size_t reserved_adrp_thunks_;
73   size_t processed_adrp_thunks_;
74   std::vector<uint8_t> current_method_thunks_;
75 
76   friend class Arm64RelativePatcherTest;
77 
78   DISALLOW_COPY_AND_ASSIGN(Arm64RelativePatcher);
79 };
80 
81 }  // namespace linker
82 }  // namespace art
83 
84 #endif  // ART_DEX2OAT_LINKER_ARM64_RELATIVE_PATCHER_ARM64_H_
85