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', '0', '9', '\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)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 : image_begin_(image_begin),
40 image_size_(image_size),
41 image_bitmap_offset_(image_bitmap_offset),
42 image_bitmap_size_(image_bitmap_size),
43 oat_checksum_(oat_checksum),
44 oat_file_begin_(oat_file_begin),
45 oat_data_begin_(oat_data_begin),
46 oat_data_end_(oat_data_end),
47 oat_file_end_(oat_file_end),
48 patch_delta_(0),
49 image_roots_(image_roots) {
50 CHECK_EQ(image_begin, RoundUp(image_begin, kPageSize));
51 CHECK_EQ(oat_file_begin, RoundUp(oat_file_begin, kPageSize));
52 CHECK_EQ(oat_data_begin, RoundUp(oat_data_begin, kPageSize));
53 CHECK_LT(image_begin, image_roots);
54 CHECK_LT(image_roots, oat_file_begin);
55 CHECK_LE(oat_file_begin, oat_data_begin);
56 CHECK_LT(oat_data_begin, oat_data_end);
57 CHECK_LE(oat_data_end, oat_file_end);
58 memcpy(magic_, kImageMagic, sizeof(kImageMagic));
59 memcpy(version_, kImageVersion, sizeof(kImageVersion));
60 }
61
RelocateImage(off_t delta)62 void ImageHeader::RelocateImage(off_t delta) {
63 CHECK_ALIGNED(delta, kPageSize) << " patch delta must be page aligned";
64 image_begin_ += delta;
65 oat_file_begin_ += delta;
66 oat_data_begin_ += delta;
67 oat_data_end_ += delta;
68 oat_file_end_ += delta;
69 image_roots_ += delta;
70 patch_delta_ += delta;
71 }
72
IsValid() const73 bool ImageHeader::IsValid() const {
74 if (memcmp(magic_, kImageMagic, sizeof(kImageMagic)) != 0) {
75 return false;
76 }
77 if (memcmp(version_, kImageVersion, sizeof(kImageVersion)) != 0) {
78 return false;
79 }
80 // Unsigned so wraparound is well defined.
81 if (image_begin_ >= image_begin_ + image_size_) {
82 return false;
83 }
84 if (oat_file_begin_ > oat_file_end_) {
85 return false;
86 }
87 if (oat_data_begin_ > oat_data_end_) {
88 return false;
89 }
90 if (oat_file_begin_ >= oat_data_begin_) {
91 return false;
92 }
93 if (image_roots_ <= image_begin_ || oat_file_begin_ <= image_roots_) {
94 return false;
95 }
96 if (!IsAligned<kPageSize>(patch_delta_)) {
97 return false;
98 }
99 return true;
100 }
101
GetMagic() const102 const char* ImageHeader::GetMagic() const {
103 CHECK(IsValid());
104 return reinterpret_cast<const char*>(magic_);
105 }
106
GetImageRoot(ImageRoot image_root) const107 mirror::Object* ImageHeader::GetImageRoot(ImageRoot image_root) const {
108 return GetImageRoots()->Get(image_root);
109 }
110
GetImageRoots() const111 mirror::ObjectArray<mirror::Object>* ImageHeader::GetImageRoots() const {
112 return reinterpret_cast<mirror::ObjectArray<mirror::Object>*>(image_roots_);
113 }
114
115 } // namespace art
116