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 #include "linker/relative_patcher.h" 18 19 #ifdef ART_ENABLE_CODEGEN_arm 20 #include "linker/arm/relative_patcher_thumb2.h" 21 #endif 22 #ifdef ART_ENABLE_CODEGEN_arm64 23 #include "linker/arm64/relative_patcher_arm64.h" 24 #endif 25 #ifdef ART_ENABLE_CODEGEN_mips 26 #include "linker/mips/relative_patcher_mips.h" 27 #endif 28 #ifdef ART_ENABLE_CODEGEN_mips64 29 #include "linker/mips64/relative_patcher_mips64.h" 30 #endif 31 #ifdef ART_ENABLE_CODEGEN_x86 32 #include "linker/x86/relative_patcher_x86.h" 33 #endif 34 #ifdef ART_ENABLE_CODEGEN_x86_64 35 #include "linker/x86_64/relative_patcher_x86_64.h" 36 #endif 37 #include "output_stream.h" 38 39 namespace art { 40 namespace linker { 41 42 std::unique_ptr<RelativePatcher> RelativePatcher::Create( 43 InstructionSet instruction_set, 44 const InstructionSetFeatures* features, 45 RelativePatcherTargetProvider* provider) { 46 class RelativePatcherNone FINAL : public RelativePatcher { 47 public: 48 RelativePatcherNone() { } 49 50 uint32_t ReserveSpace(uint32_t offset, 51 const CompiledMethod* compiled_method ATTRIBUTE_UNUSED, 52 MethodReference method_ref ATTRIBUTE_UNUSED) OVERRIDE { 53 return offset; // No space reserved; no patches expected. 54 } 55 56 uint32_t ReserveSpaceEnd(uint32_t offset) OVERRIDE { 57 return offset; // No space reserved; no patches expected. 58 } 59 60 uint32_t WriteThunks(OutputStream* out ATTRIBUTE_UNUSED, uint32_t offset) OVERRIDE { 61 return offset; // No thunks added; no patches expected. 62 } 63 64 void PatchCall(std::vector<uint8_t>* code ATTRIBUTE_UNUSED, 65 uint32_t literal_offset ATTRIBUTE_UNUSED, 66 uint32_t patch_offset ATTRIBUTE_UNUSED, 67 uint32_t target_offset ATTRIBUTE_UNUSED) OVERRIDE { 68 LOG(FATAL) << "Unexpected relative call patch."; 69 } 70 71 void PatchPcRelativeReference(std::vector<uint8_t>* code ATTRIBUTE_UNUSED, 72 const LinkerPatch& patch ATTRIBUTE_UNUSED, 73 uint32_t patch_offset ATTRIBUTE_UNUSED, 74 uint32_t target_offset ATTRIBUTE_UNUSED) OVERRIDE { 75 LOG(FATAL) << "Unexpected relative dex cache array patch."; 76 } 77 78 void PatchBakerReadBarrierBranch(std::vector<uint8_t>* code ATTRIBUTE_UNUSED, 79 const LinkerPatch& patch ATTRIBUTE_UNUSED, 80 uint32_t patch_offset ATTRIBUTE_UNUSED) { 81 LOG(FATAL) << "Unexpected baker read barrier branch patch."; 82 } 83 84 private: 85 DISALLOW_COPY_AND_ASSIGN(RelativePatcherNone); 86 }; 87 88 UNUSED(features); 89 UNUSED(provider); 90 switch (instruction_set) { 91 #ifdef ART_ENABLE_CODEGEN_x86 92 case kX86: 93 return std::unique_ptr<RelativePatcher>(new X86RelativePatcher()); 94 #endif 95 #ifdef ART_ENABLE_CODEGEN_x86_64 96 case kX86_64: 97 return std::unique_ptr<RelativePatcher>(new X86_64RelativePatcher()); 98 #endif 99 #ifdef ART_ENABLE_CODEGEN_arm 100 case kArm: 101 // Fall through: we generate Thumb2 code for "arm". 102 case kThumb2: 103 return std::unique_ptr<RelativePatcher>(new Thumb2RelativePatcher(provider)); 104 #endif 105 #ifdef ART_ENABLE_CODEGEN_arm64 106 case kArm64: 107 return std::unique_ptr<RelativePatcher>( 108 new Arm64RelativePatcher(provider, features->AsArm64InstructionSetFeatures())); 109 #endif 110 #ifdef ART_ENABLE_CODEGEN_mips 111 case kMips: 112 return std::unique_ptr<RelativePatcher>( 113 new MipsRelativePatcher(features->AsMipsInstructionSetFeatures())); 114 #endif 115 #ifdef ART_ENABLE_CODEGEN_mips64 116 case kMips64: 117 return std::unique_ptr<RelativePatcher>(new Mips64RelativePatcher()); 118 #endif 119 default: 120 return std::unique_ptr<RelativePatcher>(new RelativePatcherNone); 121 } 122 } 123 124 bool RelativePatcher::WriteCodeAlignment(OutputStream* out, uint32_t aligned_code_delta) { 125 static const uint8_t kPadding[] = { 126 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u 127 }; 128 DCHECK_LE(aligned_code_delta, sizeof(kPadding)); 129 if (UNLIKELY(!out->WriteFully(kPadding, aligned_code_delta))) { 130 return false; 131 } 132 size_code_alignment_ += aligned_code_delta; 133 return true; 134 } 135 136 bool RelativePatcher::WriteThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) { 137 if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) { 138 return false; 139 } 140 size_relative_call_thunks_ += thunk.size(); 141 return true; 142 } 143 144 bool RelativePatcher::WriteMiscThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) { 145 if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) { 146 return false; 147 } 148 size_misc_thunks_ += thunk.size(); 149 return true; 150 } 151 152 } // namespace linker 153 } // namespace art 154