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_x86
27 #include "linker/x86/relative_patcher_x86.h"
28 #endif
29 #ifdef ART_ENABLE_CODEGEN_x86_64
30 #include "linker/x86_64/relative_patcher_x86_64.h"
31 #endif
32 #include "stream/output_stream.h"
33
34 namespace art {
35 namespace linker {
36
Create(InstructionSet instruction_set,const InstructionSetFeatures * features,RelativePatcherThunkProvider * thunk_provider,RelativePatcherTargetProvider * target_provider)37 std::unique_ptr<RelativePatcher> RelativePatcher::Create(
38 InstructionSet instruction_set,
39 const InstructionSetFeatures* features,
40 RelativePatcherThunkProvider* thunk_provider,
41 RelativePatcherTargetProvider* target_provider) {
42 class RelativePatcherNone final : public RelativePatcher {
43 public:
44 RelativePatcherNone() { }
45
46 uint32_t ReserveSpace(uint32_t offset,
47 const CompiledMethod* compiled_method ATTRIBUTE_UNUSED,
48 MethodReference method_ref ATTRIBUTE_UNUSED) override {
49 return offset; // No space reserved; no patches expected.
50 }
51
52 uint32_t ReserveSpaceEnd(uint32_t offset) override {
53 return offset; // No space reserved; no patches expected.
54 }
55
56 uint32_t WriteThunks(OutputStream* out ATTRIBUTE_UNUSED, uint32_t offset) override {
57 return offset; // No thunks added; no patches expected.
58 }
59
60 void PatchCall(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
61 uint32_t literal_offset ATTRIBUTE_UNUSED,
62 uint32_t patch_offset ATTRIBUTE_UNUSED,
63 uint32_t target_offset ATTRIBUTE_UNUSED) override {
64 LOG(FATAL) << "Unexpected relative call patch.";
65 }
66
67 void PatchPcRelativeReference(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
68 const LinkerPatch& patch ATTRIBUTE_UNUSED,
69 uint32_t patch_offset ATTRIBUTE_UNUSED,
70 uint32_t target_offset ATTRIBUTE_UNUSED) override {
71 LOG(FATAL) << "Unexpected relative dex cache array patch.";
72 }
73
74 void PatchEntrypointCall(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
75 const LinkerPatch& patch ATTRIBUTE_UNUSED,
76 uint32_t patch_offset ATTRIBUTE_UNUSED) override {
77 LOG(FATAL) << "Unexpected entrypoint call patch.";
78 }
79
80 void PatchBakerReadBarrierBranch(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
81 const LinkerPatch& patch ATTRIBUTE_UNUSED,
82 uint32_t patch_offset ATTRIBUTE_UNUSED) override {
83 LOG(FATAL) << "Unexpected baker read barrier branch patch.";
84 }
85
86 std::vector<debug::MethodDebugInfo> GenerateThunkDebugInfo(
87 uint32_t executable_offset ATTRIBUTE_UNUSED) override {
88 return std::vector<debug::MethodDebugInfo>(); // No thunks added.
89 }
90
91 private:
92 DISALLOW_COPY_AND_ASSIGN(RelativePatcherNone);
93 };
94
95 UNUSED(features);
96 UNUSED(thunk_provider);
97 UNUSED(target_provider);
98 switch (instruction_set) {
99 #ifdef ART_ENABLE_CODEGEN_x86
100 case InstructionSet::kX86:
101 return std::unique_ptr<RelativePatcher>(new X86RelativePatcher());
102 #endif
103 #ifdef ART_ENABLE_CODEGEN_x86_64
104 case InstructionSet::kX86_64:
105 return std::unique_ptr<RelativePatcher>(new X86_64RelativePatcher());
106 #endif
107 #ifdef ART_ENABLE_CODEGEN_arm
108 case InstructionSet::kArm:
109 // Fall through: we generate Thumb2 code for "arm".
110 case InstructionSet::kThumb2:
111 return std::unique_ptr<RelativePatcher>(
112 new Thumb2RelativePatcher(thunk_provider, target_provider));
113 #endif
114 #ifdef ART_ENABLE_CODEGEN_arm64
115 case InstructionSet::kArm64:
116 return std::unique_ptr<RelativePatcher>(
117 new Arm64RelativePatcher(thunk_provider,
118 target_provider,
119 features->AsArm64InstructionSetFeatures()));
120 #endif
121 default:
122 return std::unique_ptr<RelativePatcher>(new RelativePatcherNone);
123 }
124 }
125
WriteCodeAlignment(OutputStream * out,uint32_t aligned_code_delta)126 bool RelativePatcher::WriteCodeAlignment(OutputStream* out, uint32_t aligned_code_delta) {
127 static const uint8_t kPadding[] = {
128 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u
129 };
130 DCHECK_LE(aligned_code_delta, sizeof(kPadding));
131 if (UNLIKELY(!out->WriteFully(kPadding, aligned_code_delta))) {
132 return false;
133 }
134 size_code_alignment_ += aligned_code_delta;
135 return true;
136 }
137
WriteThunk(OutputStream * out,const ArrayRef<const uint8_t> & thunk)138 bool RelativePatcher::WriteThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) {
139 if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) {
140 return false;
141 }
142 size_relative_call_thunks_ += thunk.size();
143 return true;
144 }
145
WriteMiscThunk(OutputStream * out,const ArrayRef<const uint8_t> & thunk)146 bool RelativePatcher::WriteMiscThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) {
147 if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) {
148 return false;
149 }
150 size_misc_thunks_ += thunk.size();
151 return true;
152 }
153
154 } // namespace linker
155 } // namespace art
156