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
Create(InstructionSet instruction_set,const InstructionSetFeatures * features,RelativePatcherTargetProvider * provider)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
WriteCodeAlignment(OutputStream * out,uint32_t aligned_code_delta)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
WriteThunk(OutputStream * out,const ArrayRef<const uint8_t> & thunk)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
WriteMiscThunk(OutputStream * out,const ArrayRef<const uint8_t> & thunk)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