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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "image.h"
#include <lz4.h>
#include <sstream>
#include "base/bit_utils.h"
#include "base/length_prefixed_array.h"
#include "base/utils.h"
#include "mirror/object-inl.h"
#include "mirror/object_array-inl.h"
#include "mirror/object_array.h"
namespace art {
const uint8_t ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
const uint8_t ImageHeader::kImageVersion[] = { '0', '8', '5', '\0' }; // Single-image.
ImageHeader::ImageHeader(uint32_t image_reservation_size,
uint32_t component_count,
uint32_t image_begin,
uint32_t image_size,
ImageSection* sections,
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,
uint32_t boot_image_begin,
uint32_t boot_image_size,
uint32_t boot_image_component_count,
uint32_t boot_image_checksum,
uint32_t pointer_size)
: image_reservation_size_(image_reservation_size),
component_count_(component_count),
image_begin_(image_begin),
image_size_(image_size),
image_checksum_(0u),
oat_checksum_(oat_checksum),
oat_file_begin_(oat_file_begin),
oat_data_begin_(oat_data_begin),
oat_data_end_(oat_data_end),
oat_file_end_(oat_file_end),
boot_image_begin_(boot_image_begin),
boot_image_size_(boot_image_size),
boot_image_component_count_(boot_image_component_count),
boot_image_checksum_(boot_image_checksum),
image_roots_(image_roots),
pointer_size_(pointer_size) {
CHECK_EQ(image_begin, RoundUp(image_begin, kPageSize));
CHECK_EQ(oat_file_begin, RoundUp(oat_file_begin, kPageSize));
CHECK_EQ(oat_data_begin, RoundUp(oat_data_begin, kPageSize));
CHECK_LT(image_roots, oat_file_begin);
CHECK_LE(oat_file_begin, oat_data_begin);
CHECK_LT(oat_data_begin, oat_data_end);
CHECK_LE(oat_data_end, oat_file_end);
CHECK(ValidPointerSize(pointer_size_)) << pointer_size_;
memcpy(magic_, kImageMagic, sizeof(kImageMagic));
memcpy(version_, kImageVersion, sizeof(kImageVersion));
std::copy_n(sections, kSectionCount, sections_);
}
void ImageHeader::RelocateImageReferences(int64_t delta) {
CHECK_ALIGNED(delta, kPageSize) << "relocation delta must be page aligned";
oat_file_begin_ += delta;
oat_data_begin_ += delta;
oat_data_end_ += delta;
oat_file_end_ += delta;
image_begin_ += delta;
image_roots_ += delta;
}
void ImageHeader::RelocateBootImageReferences(int64_t delta) {
CHECK_ALIGNED(delta, kPageSize) << "relocation delta must be page aligned";
DCHECK_EQ(boot_image_begin_ != 0u, boot_image_size_ != 0u);
if (boot_image_begin_ != 0u) {
boot_image_begin_ += delta;
}
for (size_t i = 0; i < kImageMethodsCount; ++i) {
image_methods_[i] += delta;
}
}
bool ImageHeader::IsAppImage() const {
// Unlike boot image and boot image extensions which include address space for
// oat files in their reservation size, app images are loaded separately from oat
// files and their reservation size is the image size rounded up to full page.
return image_reservation_size_ == RoundUp(image_size_, kPageSize);
}
uint32_t ImageHeader::GetImageSpaceCount() const {
DCHECK(!IsAppImage());
DCHECK_NE(component_count_, 0u); // Must be the header for the first component.
// For images compiled with --single-image, there is only one oat file. To detect
// that, check whether the reservation ends at the end of the first oat file.
return (image_begin_ + image_reservation_size_ == oat_file_end_) ? 1u : component_count_;
}
bool ImageHeader::IsValid() const {
if (memcmp(magic_, kImageMagic, sizeof(kImageMagic)) != 0) {
return false;
}
if (memcmp(version_, kImageVersion, sizeof(kImageVersion)) != 0) {
return false;
}
if (!IsAligned<kPageSize>(image_reservation_size_)) {
return false;
}
// Unsigned so wraparound is well defined.
if (image_begin_ >= image_begin_ + image_size_) {
return false;
}
if (oat_file_begin_ > oat_file_end_) {
return false;
}
if (oat_data_begin_ > oat_data_end_) {
return false;
}
if (oat_file_begin_ >= oat_data_begin_) {
return false;
}
return true;
}
const char* ImageHeader::GetMagic() const {
CHECK(IsValid());
return reinterpret_cast<const char*>(magic_);
}
ArtMethod* ImageHeader::GetImageMethod(ImageMethod index) const {
CHECK_LT(static_cast<size_t>(index), kImageMethodsCount);
return reinterpret_cast<ArtMethod*>(image_methods_[index]);
}
std::ostream& operator<<(std::ostream& os, const ImageSection& section) {
return os << "size=" << section.Size() << " range=" << section.Offset() << "-" << section.End();
}
void ImageHeader::VisitObjects(ObjectVisitor* visitor,
uint8_t* base,
PointerSize pointer_size) const {
DCHECK_EQ(pointer_size, GetPointerSize());
const ImageSection& objects = GetObjectsSection();
static const size_t kStartPos = RoundUp(sizeof(ImageHeader), kObjectAlignment);
for (size_t pos = kStartPos; pos < objects.Size(); ) {
mirror::Object* object = reinterpret_cast<mirror::Object*>(base + objects.Offset() + pos);
visitor->Visit(object);
pos += RoundUp(object->SizeOf(), kObjectAlignment);
}
}
PointerSize ImageHeader::GetPointerSize() const {
return ConvertToPointerSize(pointer_size_);
}
bool ImageHeader::Block::Decompress(uint8_t* out_ptr,
const uint8_t* in_ptr,
std::string* error_msg) const {
switch (storage_mode_) {
case kStorageModeUncompressed: {
CHECK_EQ(image_size_, data_size_);
memcpy(out_ptr + image_offset_, in_ptr + data_offset_, data_size_);
break;
}
case kStorageModeLZ4:
case kStorageModeLZ4HC: {
// LZ4HC and LZ4 have same internal format, both use LZ4_decompress.
const size_t decompressed_size = LZ4_decompress_safe(
reinterpret_cast<const char*>(in_ptr) + data_offset_,
reinterpret_cast<char*>(out_ptr) + image_offset_,
data_size_,
image_size_);
CHECK_EQ(decompressed_size, image_size_);
break;
}
default: {
if (error_msg != nullptr) {
*error_msg = "Invalid image format " + storage_mode_;
}
return false;
}
}
return true;
}
} // namespace art
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