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 "mirror/object_array.h"
20 #include "mirror/object_array-inl.h"
21 #include "mirror/object-inl.h"
22 #include "utils.h"
23
24 namespace art {
25
26 const byte ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
27 const byte ImageHeader::kImageVersion[] = { '0', '1', '2', '\0' };
28
ImageHeader(uint32_t image_begin,uint32_t image_size,uint32_t image_bitmap_offset,uint32_t image_bitmap_size,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,bool compile_pic)29 ImageHeader::ImageHeader(uint32_t image_begin,
30 uint32_t image_size,
31 uint32_t image_bitmap_offset,
32 uint32_t image_bitmap_size,
33 uint32_t image_roots,
34 uint32_t oat_checksum,
35 uint32_t oat_file_begin,
36 uint32_t oat_data_begin,
37 uint32_t oat_data_end,
38 uint32_t oat_file_end,
39 bool compile_pic)
40 : image_begin_(image_begin),
41 image_size_(image_size),
42 image_bitmap_offset_(image_bitmap_offset),
43 image_bitmap_size_(image_bitmap_size),
44 oat_checksum_(oat_checksum),
45 oat_file_begin_(oat_file_begin),
46 oat_data_begin_(oat_data_begin),
47 oat_data_end_(oat_data_end),
48 oat_file_end_(oat_file_end),
49 patch_delta_(0),
50 image_roots_(image_roots),
51 compile_pic_(compile_pic) {
52 CHECK_EQ(image_begin, RoundUp(image_begin, kPageSize));
53 CHECK_EQ(oat_file_begin, RoundUp(oat_file_begin, kPageSize));
54 CHECK_EQ(oat_data_begin, RoundUp(oat_data_begin, kPageSize));
55 CHECK_LT(image_begin, image_roots);
56 CHECK_LT(image_roots, oat_file_begin);
57 CHECK_LE(oat_file_begin, oat_data_begin);
58 CHECK_LT(oat_data_begin, oat_data_end);
59 CHECK_LE(oat_data_end, oat_file_end);
60 memcpy(magic_, kImageMagic, sizeof(kImageMagic));
61 memcpy(version_, kImageVersion, sizeof(kImageVersion));
62 }
63
RelocateImage(off_t delta)64 void ImageHeader::RelocateImage(off_t delta) {
65 CHECK_ALIGNED(delta, kPageSize) << " patch delta must be page aligned";
66 image_begin_ += delta;
67 oat_file_begin_ += delta;
68 oat_data_begin_ += delta;
69 oat_data_end_ += delta;
70 oat_file_end_ += delta;
71 image_roots_ += delta;
72 patch_delta_ += delta;
73 }
74
IsValid() const75 bool ImageHeader::IsValid() const {
76 if (memcmp(magic_, kImageMagic, sizeof(kImageMagic)) != 0) {
77 return false;
78 }
79 if (memcmp(version_, kImageVersion, sizeof(kImageVersion)) != 0) {
80 return false;
81 }
82 // Unsigned so wraparound is well defined.
83 if (image_begin_ >= image_begin_ + image_size_) {
84 return false;
85 }
86 if (oat_file_begin_ > oat_file_end_) {
87 return false;
88 }
89 if (oat_data_begin_ > oat_data_end_) {
90 return false;
91 }
92 if (oat_file_begin_ >= oat_data_begin_) {
93 return false;
94 }
95 if (image_roots_ <= image_begin_ || oat_file_begin_ <= image_roots_) {
96 return false;
97 }
98 if (!IsAligned<kPageSize>(patch_delta_)) {
99 return false;
100 }
101 return true;
102 }
103
GetMagic() const104 const char* ImageHeader::GetMagic() const {
105 CHECK(IsValid());
106 return reinterpret_cast<const char*>(magic_);
107 }
108
GetImageRoot(ImageRoot image_root) const109 mirror::Object* ImageHeader::GetImageRoot(ImageRoot image_root) const {
110 return GetImageRoots()->Get(image_root);
111 }
112
GetImageRoots() const113 mirror::ObjectArray<mirror::Object>* ImageHeader::GetImageRoots() const {
114 return reinterpret_cast<mirror::ObjectArray<mirror::Object>*>(image_roots_);
115 }
116
117 } // namespace art
118