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 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 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 73 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 } 101 102 const char* ImageHeader::GetMagic() const { 103 CHECK(IsValid()); 104 return reinterpret_cast<const char*>(magic_); 105 } 106 107 mirror::Object* ImageHeader::GetImageRoot(ImageRoot image_root) const { 108 return GetImageRoots()->Get(image_root); 109 } 110 111 mirror::ObjectArray<mirror::Object>* ImageHeader::GetImageRoots() const { 112 return reinterpret_cast<mirror::ObjectArray<mirror::Object>*>(image_roots_); 113 } 114 115 } // namespace art 116
