1 /*
2  * Copyright (C) 2016 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_COMPILER_LINKER_MIPS_RELATIVE_PATCHER_MIPS_H_
18 #define ART_COMPILER_LINKER_MIPS_RELATIVE_PATCHER_MIPS_H_
19 
20 #include "linker/relative_patcher.h"
21 #include "arch/mips/instruction_set_features_mips.h"
22 
23 namespace art {
24 namespace linker {
25 
26 class MipsRelativePatcher FINAL : public RelativePatcher {
27  public:
MipsRelativePatcher(const MipsInstructionSetFeatures * features)28   explicit MipsRelativePatcher(const MipsInstructionSetFeatures* features)
29       : is_r6(features->IsR6()) {}
30 
31   uint32_t ReserveSpace(uint32_t offset,
32                         const CompiledMethod* compiled_method,
33                         MethodReference method_ref) OVERRIDE;
34   uint32_t ReserveSpaceEnd(uint32_t offset) OVERRIDE;
35   uint32_t WriteThunks(OutputStream* out, uint32_t offset) OVERRIDE;
36   void PatchCall(std::vector<uint8_t>* code,
37                  uint32_t literal_offset,
38                  uint32_t patch_offset,
39                  uint32_t target_offset) OVERRIDE;
40   void PatchPcRelativeReference(std::vector<uint8_t>* code,
41                                 const LinkerPatch& patch,
42                                 uint32_t patch_offset,
43                                 uint32_t target_offset) OVERRIDE;
44   void PatchBakerReadBarrierBranch(std::vector<uint8_t>* code,
45                                    const LinkerPatch& patch,
46                                    uint32_t patch_offset) OVERRIDE;
47 
48  private:
49   // We'll maximize the range of a single load instruction for dex cache array accesses
50   // by aligning offset -32768 with the offset of the first used element.
51   static constexpr uint32_t kDexCacheArrayLwOffset = 0x8000;
52   bool is_r6;
53 
54   DISALLOW_COPY_AND_ASSIGN(MipsRelativePatcher);
55 };
56 
57 }  // namespace linker
58 }  // namespace art
59 
60 #endif  // ART_COMPILER_LINKER_MIPS_RELATIVE_PATCHER_MIPS_H_
61