1 /*
2 * Copyright (C) 2011 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 "image.h"
18
19 #include "base/bit_utils.h"
20 #include "base/length_prefixed_array.h"
21 #include "mirror/object_array.h"
22 #include "mirror/object_array-inl.h"
23 #include "mirror/object-inl.h"
24 #include "utils.h"
25
26 namespace art {
27
28 const uint8_t ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
29 const uint8_t ImageHeader::kImageVersion[] = { '0', '4', '3', '\0' }; // hash-based DexCache fields
30
ImageHeader(uint32_t image_begin,uint32_t image_size,ImageSection * sections,uint32_t image_roots,uint32_t oat_checksum,uint32_t oat_file_begin,uint32_t oat_data_begin,uint32_t oat_data_end,uint32_t oat_file_end,uint32_t boot_image_begin,uint32_t boot_image_size,uint32_t boot_oat_begin,uint32_t boot_oat_size,uint32_t pointer_size,bool compile_pic,bool is_pic,StorageMode storage_mode,size_t data_size)31 ImageHeader::ImageHeader(uint32_t image_begin,
32 uint32_t image_size,
33 ImageSection* sections,
34 uint32_t image_roots,
35 uint32_t oat_checksum,
36 uint32_t oat_file_begin,
37 uint32_t oat_data_begin,
38 uint32_t oat_data_end,
39 uint32_t oat_file_end,
40 uint32_t boot_image_begin,
41 uint32_t boot_image_size,
42 uint32_t boot_oat_begin,
43 uint32_t boot_oat_size,
44 uint32_t pointer_size,
45 bool compile_pic,
46 bool is_pic,
47 StorageMode storage_mode,
48 size_t data_size)
49 : image_begin_(image_begin),
50 image_size_(image_size),
51 oat_checksum_(oat_checksum),
52 oat_file_begin_(oat_file_begin),
53 oat_data_begin_(oat_data_begin),
54 oat_data_end_(oat_data_end),
55 oat_file_end_(oat_file_end),
56 boot_image_begin_(boot_image_begin),
57 boot_image_size_(boot_image_size),
58 boot_oat_begin_(boot_oat_begin),
59 boot_oat_size_(boot_oat_size),
60 patch_delta_(0),
61 image_roots_(image_roots),
62 pointer_size_(pointer_size),
63 compile_pic_(compile_pic),
64 is_pic_(is_pic),
65 storage_mode_(storage_mode),
66 data_size_(data_size) {
67 CHECK_EQ(image_begin, RoundUp(image_begin, kPageSize));
68 CHECK_EQ(oat_file_begin, RoundUp(oat_file_begin, kPageSize));
69 CHECK_EQ(oat_data_begin, RoundUp(oat_data_begin, kPageSize));
70 CHECK_LT(image_roots, oat_file_begin);
71 CHECK_LE(oat_file_begin, oat_data_begin);
72 CHECK_LT(oat_data_begin, oat_data_end);
73 CHECK_LE(oat_data_end, oat_file_end);
74 CHECK(ValidPointerSize(pointer_size_)) << pointer_size_;
75 memcpy(magic_, kImageMagic, sizeof(kImageMagic));
76 memcpy(version_, kImageVersion, sizeof(kImageVersion));
77 std::copy_n(sections, kSectionCount, sections_);
78 }
79
RelocateImage(off_t delta)80 void ImageHeader::RelocateImage(off_t delta) {
81 CHECK_ALIGNED(delta, kPageSize) << " patch delta must be page aligned";
82 oat_file_begin_ += delta;
83 oat_data_begin_ += delta;
84 oat_data_end_ += delta;
85 oat_file_end_ += delta;
86 patch_delta_ += delta;
87 RelocateImageObjects(delta);
88 RelocateImageMethods(delta);
89 }
90
RelocateImageObjects(off_t delta)91 void ImageHeader::RelocateImageObjects(off_t delta) {
92 image_begin_ += delta;
93 image_roots_ += delta;
94 }
95
RelocateImageMethods(off_t delta)96 void ImageHeader::RelocateImageMethods(off_t delta) {
97 for (size_t i = 0; i < kImageMethodsCount; ++i) {
98 image_methods_[i] += delta;
99 }
100 }
101
IsValid() const102 bool ImageHeader::IsValid() const {
103 if (memcmp(magic_, kImageMagic, sizeof(kImageMagic)) != 0) {
104 return false;
105 }
106 if (memcmp(version_, kImageVersion, sizeof(kImageVersion)) != 0) {
107 return false;
108 }
109 // Unsigned so wraparound is well defined.
110 if (image_begin_ >= image_begin_ + image_size_) {
111 return false;
112 }
113 if (oat_file_begin_ > oat_file_end_) {
114 return false;
115 }
116 if (oat_data_begin_ > oat_data_end_) {
117 return false;
118 }
119 if (oat_file_begin_ >= oat_data_begin_) {
120 return false;
121 }
122 if (!IsAligned<kPageSize>(patch_delta_)) {
123 return false;
124 }
125 return true;
126 }
127
GetMagic() const128 const char* ImageHeader::GetMagic() const {
129 CHECK(IsValid());
130 return reinterpret_cast<const char*>(magic_);
131 }
132
GetImageMethod(ImageMethod index) const133 ArtMethod* ImageHeader::GetImageMethod(ImageMethod index) const {
134 CHECK_LT(static_cast<size_t>(index), kImageMethodsCount);
135 return reinterpret_cast<ArtMethod*>(image_methods_[index]);
136 }
137
SetImageMethod(ImageMethod index,ArtMethod * method)138 void ImageHeader::SetImageMethod(ImageMethod index, ArtMethod* method) {
139 CHECK_LT(static_cast<size_t>(index), kImageMethodsCount);
140 image_methods_[index] = reinterpret_cast<uint64_t>(method);
141 }
142
GetImageSection(ImageSections index) const143 const ImageSection& ImageHeader::GetImageSection(ImageSections index) const {
144 CHECK_LT(static_cast<size_t>(index), kSectionCount);
145 return sections_[index];
146 }
147
operator <<(std::ostream & os,const ImageSection & section)148 std::ostream& operator<<(std::ostream& os, const ImageSection& section) {
149 return os << "size=" << section.Size() << " range=" << section.Offset() << "-" << section.End();
150 }
151
VisitPackedArtFields(ArtFieldVisitor * visitor,uint8_t * base) const152 void ImageHeader::VisitPackedArtFields(ArtFieldVisitor* visitor, uint8_t* base) const {
153 const ImageSection& fields = GetFieldsSection();
154 for (size_t pos = 0; pos < fields.Size(); ) {
155 auto* array = reinterpret_cast<LengthPrefixedArray<ArtField>*>(base + fields.Offset() + pos);
156 for (size_t i = 0; i < array->size(); ++i) {
157 visitor->Visit(&array->At(i, sizeof(ArtField)));
158 }
159 pos += array->ComputeSize(array->size());
160 }
161 }
162
VisitPackedArtMethods(ArtMethodVisitor * visitor,uint8_t * base,PointerSize pointer_size) const163 void ImageHeader::VisitPackedArtMethods(ArtMethodVisitor* visitor,
164 uint8_t* base,
165 PointerSize pointer_size) const {
166 const size_t method_alignment = ArtMethod::Alignment(pointer_size);
167 const size_t method_size = ArtMethod::Size(pointer_size);
168 const ImageSection& methods = GetMethodsSection();
169 for (size_t pos = 0; pos < methods.Size(); ) {
170 auto* array = reinterpret_cast<LengthPrefixedArray<ArtMethod>*>(base + methods.Offset() + pos);
171 for (size_t i = 0; i < array->size(); ++i) {
172 visitor->Visit(&array->At(i, method_size, method_alignment));
173 }
174 pos += array->ComputeSize(array->size(), method_size, method_alignment);
175 }
176 const ImageSection& runtime_methods = GetRuntimeMethodsSection();
177 for (size_t pos = 0; pos < runtime_methods.Size(); ) {
178 auto* method = reinterpret_cast<ArtMethod*>(base + runtime_methods.Offset() + pos);
179 visitor->Visit(method);
180 pos += method_size;
181 }
182 }
183
GetPointerSize() const184 PointerSize ImageHeader::GetPointerSize() const {
185 return ConvertToPointerSize(pointer_size_);
186 }
187
188 } // namespace art
189