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_COMPILER_LINKER_X86_RELATIVE_PATCHER_X86_BASE_H_
18 #define ART_COMPILER_LINKER_X86_RELATIVE_PATCHER_X86_BASE_H_
19 
20 #include "linker/relative_patcher.h"
21 
22 namespace art {
23 namespace linker {
24 
25 class X86BaseRelativePatcher : public RelativePatcher {
26  public:
27   uint32_t ReserveSpace(uint32_t offset,
28                         const CompiledMethod* compiled_method,
29                         MethodReference method_ref) OVERRIDE;
30   uint32_t ReserveSpaceEnd(uint32_t offset) OVERRIDE;
31   uint32_t WriteThunks(OutputStream* out, uint32_t offset) OVERRIDE;
32   void PatchCall(std::vector<uint8_t>* code,
33                  uint32_t literal_offset,
34                  uint32_t patch_offset,
35                  uint32_t target_offset) OVERRIDE;
36 
37  protected:
X86BaseRelativePatcher()38   X86BaseRelativePatcher() { }
39 
40   // PC displacement from patch location; the base address of x86/x86-64 relative
41   // calls and x86-64 RIP-relative addressing is the PC of the next instruction and
42   // the patch location is 4 bytes earlier.
43   static constexpr int32_t kPcDisplacement = 4;
44 
45  private:
46   DISALLOW_COPY_AND_ASSIGN(X86BaseRelativePatcher);
47 };
48 
49 }  // namespace linker
50 }  // namespace art
51 
52 #endif  // ART_COMPILER_LINKER_X86_RELATIVE_PATCHER_X86_BASE_H_
53