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