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 #include "debug/method_debug_info.h"
20 #ifdef ART_ENABLE_CODEGEN_arm
21 #include "linker/arm/relative_patcher_thumb2.h"
22 #endif
23 #ifdef ART_ENABLE_CODEGEN_arm64
24 #include "linker/arm64/relative_patcher_arm64.h"
25 #endif
26 #ifdef ART_ENABLE_CODEGEN_mips
27 #include "linker/mips/relative_patcher_mips.h"
28 #endif
29 #ifdef ART_ENABLE_CODEGEN_mips64
30 #include "linker/mips64/relative_patcher_mips64.h"
31 #endif
32 #ifdef ART_ENABLE_CODEGEN_x86
33 #include "linker/x86/relative_patcher_x86.h"
34 #endif
35 #ifdef ART_ENABLE_CODEGEN_x86_64
36 #include "linker/x86_64/relative_patcher_x86_64.h"
37 #endif
38 #include "output_stream.h"
39
40 namespace art {
41 namespace linker {
42
Create(InstructionSet instruction_set,const InstructionSetFeatures * features,RelativePatcherTargetProvider * provider)43 std::unique_ptr<RelativePatcher> RelativePatcher::Create(
44 InstructionSet instruction_set,
45 const InstructionSetFeatures* features,
46 RelativePatcherTargetProvider* provider) {
47 class RelativePatcherNone FINAL : public RelativePatcher {
48 public:
49 RelativePatcherNone() { }
50
51 uint32_t ReserveSpace(uint32_t offset,
52 const CompiledMethod* compiled_method ATTRIBUTE_UNUSED,
53 MethodReference method_ref ATTRIBUTE_UNUSED) OVERRIDE {
54 return offset; // No space reserved; no patches expected.
55 }
56
57 uint32_t ReserveSpaceEnd(uint32_t offset) OVERRIDE {
58 return offset; // No space reserved; no patches expected.
59 }
60
61 uint32_t WriteThunks(OutputStream* out ATTRIBUTE_UNUSED, uint32_t offset) OVERRIDE {
62 return offset; // No thunks added; no patches expected.
63 }
64
65 void PatchCall(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
66 uint32_t literal_offset ATTRIBUTE_UNUSED,
67 uint32_t patch_offset ATTRIBUTE_UNUSED,
68 uint32_t target_offset ATTRIBUTE_UNUSED) OVERRIDE {
69 LOG(FATAL) << "Unexpected relative call patch.";
70 }
71
72 void PatchPcRelativeReference(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
73 const LinkerPatch& patch ATTRIBUTE_UNUSED,
74 uint32_t patch_offset ATTRIBUTE_UNUSED,
75 uint32_t target_offset ATTRIBUTE_UNUSED) OVERRIDE {
76 LOG(FATAL) << "Unexpected relative dex cache array patch.";
77 }
78
79 void PatchBakerReadBarrierBranch(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
80 const LinkerPatch& patch ATTRIBUTE_UNUSED,
81 uint32_t patch_offset ATTRIBUTE_UNUSED) {
82 LOG(FATAL) << "Unexpected baker read barrier branch patch.";
83 }
84
85 std::vector<debug::MethodDebugInfo> GenerateThunkDebugInfo(
86 uint32_t executable_offset ATTRIBUTE_UNUSED) OVERRIDE {
87 return std::vector<debug::MethodDebugInfo>(); // No thunks added.
88 }
89
90 private:
91 DISALLOW_COPY_AND_ASSIGN(RelativePatcherNone);
92 };
93
94 UNUSED(features);
95 UNUSED(provider);
96 switch (instruction_set) {
97 #ifdef ART_ENABLE_CODEGEN_x86
98 case InstructionSet::kX86:
99 return std::unique_ptr<RelativePatcher>(new X86RelativePatcher());
100 #endif
101 #ifdef ART_ENABLE_CODEGEN_x86_64
102 case InstructionSet::kX86_64:
103 return std::unique_ptr<RelativePatcher>(new X86_64RelativePatcher());
104 #endif
105 #ifdef ART_ENABLE_CODEGEN_arm
106 case InstructionSet::kArm:
107 // Fall through: we generate Thumb2 code for "arm".
108 case InstructionSet::kThumb2:
109 return std::unique_ptr<RelativePatcher>(new Thumb2RelativePatcher(provider));
110 #endif
111 #ifdef ART_ENABLE_CODEGEN_arm64
112 case InstructionSet::kArm64:
113 return std::unique_ptr<RelativePatcher>(
114 new Arm64RelativePatcher(provider, features->AsArm64InstructionSetFeatures()));
115 #endif
116 #ifdef ART_ENABLE_CODEGEN_mips
117 case InstructionSet::kMips:
118 return std::unique_ptr<RelativePatcher>(
119 new MipsRelativePatcher(features->AsMipsInstructionSetFeatures()));
120 #endif
121 #ifdef ART_ENABLE_CODEGEN_mips64
122 case InstructionSet::kMips64:
123 return std::unique_ptr<RelativePatcher>(new Mips64RelativePatcher());
124 #endif
125 default:
126 return std::unique_ptr<RelativePatcher>(new RelativePatcherNone);
127 }
128 }
129
WriteCodeAlignment(OutputStream * out,uint32_t aligned_code_delta)130 bool RelativePatcher::WriteCodeAlignment(OutputStream* out, uint32_t aligned_code_delta) {
131 static const uint8_t kPadding[] = {
132 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u
133 };
134 DCHECK_LE(aligned_code_delta, sizeof(kPadding));
135 if (UNLIKELY(!out->WriteFully(kPadding, aligned_code_delta))) {
136 return false;
137 }
138 size_code_alignment_ += aligned_code_delta;
139 return true;
140 }
141
WriteThunk(OutputStream * out,const ArrayRef<const uint8_t> & thunk)142 bool RelativePatcher::WriteThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) {
143 if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) {
144 return false;
145 }
146 size_relative_call_thunks_ += thunk.size();
147 return true;
148 }
149
WriteMiscThunk(OutputStream * out,const ArrayRef<const uint8_t> & thunk)150 bool RelativePatcher::WriteMiscThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) {
151 if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) {
152 return false;
153 }
154 size_misc_thunks_ += thunk.size();
155 return true;
156 }
157
158 } // namespace linker
159 } // namespace art
160