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 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 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 75 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 } 103 104 const char* ImageHeader::GetMagic() const { 105 CHECK(IsValid()); 106 return reinterpret_cast<const char*>(magic_); 107 } 108 109 mirror::Object* ImageHeader::GetImageRoot(ImageRoot image_root) const { 110 return GetImageRoots()->Get(image_root); 111 } 112 113 mirror::ObjectArray<mirror::Object>* ImageHeader::GetImageRoots() const { 114 return reinterpret_cast<mirror::ObjectArray<mirror::Object>*>(image_roots_); 115 } 116 117 } // namespace art 118
