/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "image.h"
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#include <lz4.h>
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#include <sstream>
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#include "base/bit_utils.h"
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#include "base/length_prefixed_array.h"
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#include "base/utils.h"
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#include "mirror/object-inl.h"
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#include "mirror/object_array-inl.h"
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#include "mirror/object_array.h"
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namespace art {
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const uint8_t ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
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const uint8_t ImageHeader::kImageVersion[] = { '0', '7', '4', '\0' }; // CRC32UpdateBB intrinsic
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ImageHeader::ImageHeader(uint32_t image_reservation_size,
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uint32_t component_count,
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uint32_t image_begin,
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uint32_t image_size,
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ImageSection* sections,
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uint32_t image_roots,
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uint32_t oat_checksum,
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uint32_t oat_file_begin,
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uint32_t oat_data_begin,
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uint32_t oat_data_end,
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uint32_t oat_file_end,
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uint32_t boot_image_begin,
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uint32_t boot_image_size,
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uint32_t pointer_size)
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: image_reservation_size_(image_reservation_size),
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component_count_(component_count),
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image_begin_(image_begin),
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image_size_(image_size),
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image_checksum_(0u),
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oat_checksum_(oat_checksum),
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oat_file_begin_(oat_file_begin),
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oat_data_begin_(oat_data_begin),
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oat_data_end_(oat_data_end),
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oat_file_end_(oat_file_end),
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boot_image_begin_(boot_image_begin),
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boot_image_size_(boot_image_size),
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image_roots_(image_roots),
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pointer_size_(pointer_size) {
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CHECK_EQ(image_begin, RoundUp(image_begin, kPageSize));
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CHECK_EQ(oat_file_begin, RoundUp(oat_file_begin, kPageSize));
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CHECK_EQ(oat_data_begin, RoundUp(oat_data_begin, kPageSize));
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CHECK_LT(image_roots, oat_file_begin);
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CHECK_LE(oat_file_begin, oat_data_begin);
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CHECK_LT(oat_data_begin, oat_data_end);
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CHECK_LE(oat_data_end, oat_file_end);
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CHECK(ValidPointerSize(pointer_size_)) << pointer_size_;
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memcpy(magic_, kImageMagic, sizeof(kImageMagic));
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memcpy(version_, kImageVersion, sizeof(kImageVersion));
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std::copy_n(sections, kSectionCount, sections_);
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}
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void ImageHeader::RelocateImage(int64_t delta) {
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CHECK_ALIGNED(delta, kPageSize) << " patch delta must be page aligned";
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oat_file_begin_ += delta;
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oat_data_begin_ += delta;
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oat_data_end_ += delta;
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oat_file_end_ += delta;
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RelocateImageObjects(delta);
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RelocateImageMethods(delta);
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}
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void ImageHeader::RelocateImageObjects(int64_t delta) {
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image_begin_ += delta;
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image_roots_ += delta;
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}
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void ImageHeader::RelocateImageMethods(int64_t delta) {
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for (size_t i = 0; i < kImageMethodsCount; ++i) {
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image_methods_[i] += delta;
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}
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}
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bool ImageHeader::IsValid() const {
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if (memcmp(magic_, kImageMagic, sizeof(kImageMagic)) != 0) {
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return false;
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}
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if (memcmp(version_, kImageVersion, sizeof(kImageVersion)) != 0) {
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return false;
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}
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if (!IsAligned<kPageSize>(image_reservation_size_)) {
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return false;
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}
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// Unsigned so wraparound is well defined.
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if (image_begin_ >= image_begin_ + image_size_) {
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return false;
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}
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if (oat_file_begin_ > oat_file_end_) {
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return false;
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}
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if (oat_data_begin_ > oat_data_end_) {
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return false;
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}
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if (oat_file_begin_ >= oat_data_begin_) {
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return false;
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}
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return true;
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}
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const char* ImageHeader::GetMagic() const {
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CHECK(IsValid());
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return reinterpret_cast<const char*>(magic_);
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}
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ArtMethod* ImageHeader::GetImageMethod(ImageMethod index) const {
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CHECK_LT(static_cast<size_t>(index), kImageMethodsCount);
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return reinterpret_cast<ArtMethod*>(image_methods_[index]);
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}
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std::ostream& operator<<(std::ostream& os, const ImageSection& section) {
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return os << "size=" << section.Size() << " range=" << section.Offset() << "-" << section.End();
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}
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void ImageHeader::VisitObjects(ObjectVisitor* visitor,
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uint8_t* base,
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PointerSize pointer_size) const {
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DCHECK_EQ(pointer_size, GetPointerSize());
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const ImageSection& objects = GetObjectsSection();
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static const size_t kStartPos = RoundUp(sizeof(ImageHeader), kObjectAlignment);
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for (size_t pos = kStartPos; pos < objects.Size(); ) {
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mirror::Object* object = reinterpret_cast<mirror::Object*>(base + objects.Offset() + pos);
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visitor->Visit(object);
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pos += RoundUp(object->SizeOf(), kObjectAlignment);
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}
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}
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PointerSize ImageHeader::GetPointerSize() const {
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return ConvertToPointerSize(pointer_size_);
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}
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bool ImageHeader::Block::Decompress(uint8_t* out_ptr,
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const uint8_t* in_ptr,
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std::string* error_msg) const {
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switch (storage_mode_) {
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case kStorageModeUncompressed: {
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CHECK_EQ(image_size_, data_size_);
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memcpy(out_ptr + image_offset_, in_ptr + data_offset_, data_size_);
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break;
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}
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case kStorageModeLZ4:
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case kStorageModeLZ4HC: {
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// LZ4HC and LZ4 have same internal format, both use LZ4_decompress.
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const size_t decompressed_size = LZ4_decompress_safe(
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reinterpret_cast<const char*>(in_ptr) + data_offset_,
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reinterpret_cast<char*>(out_ptr) + image_offset_,
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data_size_,
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image_size_);
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CHECK_EQ(decompressed_size, image_size_);
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break;
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}
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default: {
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if (error_msg != nullptr) {
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*error_msg = (std::ostringstream() << "Invalid image format " << storage_mode_).str();
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}
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return false;
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}
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}
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return true;
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}
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} // namespace art
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