1 /* 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef ECMASCRIPT_DEOPTIMIZER_RELCATOR_H 17 #define ECMASCRIPT_DEOPTIMIZER_RELCATOR_H 18 19 #include "ecmascript/common.h" 20 #if !WIN_OR_MAC_OR_IOS_PLATFORM 21 22 #include <elf.h> 23 #include <optional> 24 #include "ecmascript/ecma_macros.h" 25 26 namespace panda::ecmascript { 27 struct RelocateTextInfo { 28 uintptr_t textAddr_ {0}; 29 uintptr_t relaTextAddr_ {0}; 30 uintptr_t relaTextSize_ {0}; 31 }; 32 33 struct SymAndStrTabInfo { 34 uintptr_t symAddr_ {0}; 35 uintptr_t symSize_ {0}; 36 uintptr_t strAddr_ {0}; 37 uintptr_t strSize_ {0}; 38 }; 39 40 class Relocator { 41 public: Relocator(RelocateTextInfo relaText,SymAndStrTabInfo symAndStrTabInfo)42 PUBLIC_API Relocator(RelocateTextInfo relaText, SymAndStrTabInfo symAndStrTabInfo) 43 :relocateTextInfo_(relaText), symAndStrTabInfo_(symAndStrTabInfo) {}; 44 45 PUBLIC_API bool RelocateBySymbolId(Elf64_Word symbolId, uintptr_t patchAddr); 46 PUBLIC_API bool RelocateBySymbol(const char* symbol, uintptr_t patchAddr); 47 PUBLIC_API void DumpRelocateText(); 48 ~Relocator() = default; 49 private: 50 bool HasSymStrTable() const; 51 bool HasRelocateText() const; 52 std::optional<Elf64_Word> GetSymbol(const char* symbol) const; 53 bool Relocate(Elf64_Rela *sec, uintptr_t symbolAddr, uintptr_t patchAddr); 54 static bool BlInRange(intptr_t imm); 55 GetSymbol(Elf64_Rela * cur)56 Elf64_Word GetSymbol(Elf64_Rela *cur) const 57 { 58 Elf64_Word id = (cur->r_info >> 32); // 32: get high 32 bits 59 return id; 60 } 61 GetType(Elf64_Rela * cur)62 Elf64_Word GetType(Elf64_Rela *cur) const 63 { 64 return (cur->r_info & 0xffffffffL); // 0xffffffff :get lower 32 bits 65 } 66 67 // These accessors and mutators are identical to those defined for ELF32 68 // symbol table entries. GetBinding(Elf64_Sym * cur)69 unsigned char GetBinding(Elf64_Sym *cur) const 70 { 71 return cur->st_info >> 4; // 4: offset 72 } 73 GetType(Elf64_Sym * cur)74 unsigned char GetType(Elf64_Sym *cur) const 75 { 76 return cur->st_info & 0x0f; // f: get lowest 4 bits 77 } 78 79 RelocateTextInfo relocateTextInfo_ {0}; 80 SymAndStrTabInfo symAndStrTabInfo_ {0}; 81 }; 82 } // panda::ecmascript 83 #endif 84 #endif // ECMASCRIPT_DEOPTIMIZER_RELCATOR_H 85 86