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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 "base/bit_utils.h"
#include "mirror/object_array.h"
#include "mirror/object_array-inl.h"
#include "mirror/object-inl.h"
namespace art {
const uint8_t ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
const uint8_t ImageHeader::kImageVersion[] = { '0', '1', '7', '\0' };
ImageHeader::ImageHeader(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 pointer_size,
bool compile_pic)
: image_begin_(image_begin),
image_size_(image_size),
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),
patch_delta_(0),
image_roots_(image_roots),
pointer_size_(pointer_size),
compile_pic_(compile_pic) {
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_begin, image_roots);
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::RelocateImage(off_t delta) {
CHECK_ALIGNED(delta, kPageSize) << " patch delta must be page aligned";
image_begin_ += delta;
oat_file_begin_ += delta;
oat_data_begin_ += delta;
oat_data_end_ += delta;
oat_file_end_ += delta;
image_roots_ += delta;
patch_delta_ += delta;
for (size_t i = 0; i < kImageMethodsCount; ++i) {
image_methods_[i] += delta;
}
}
bool ImageHeader::IsValid() const {
if (memcmp(magic_, kImageMagic, sizeof(kImageMagic)) != 0) {
return false;
}
if (memcmp(version_, kImageVersion, sizeof(kImageVersion)) != 0) {
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;
}
if (image_roots_ <= image_begin_ || oat_file_begin_ <= image_roots_) {
return false;
}
if (!IsAligned<kPageSize>(patch_delta_)) {
return false;
}
return true;
}
const char* ImageHeader::GetMagic() const {
CHECK(IsValid());
return reinterpret_cast<const char*>(magic_);
}
mirror::Object* ImageHeader::GetImageRoot(ImageRoot image_root) const {
return GetImageRoots()->Get(image_root);
}
mirror::ObjectArray<mirror::Object>* ImageHeader::GetImageRoots() const {
// Need a read barrier as it's not visited during root scan.
// Pass in the address of the local variable to the read barrier
// rather than image_roots_ because it won't move (asserted below)
// and it's a const member.
mirror::ObjectArray<mirror::Object>* image_roots =
reinterpret_cast<mirror::ObjectArray<mirror::Object>*>(image_roots_);
mirror::ObjectArray<mirror::Object>* result =
ReadBarrier::BarrierForRoot<mirror::ObjectArray<mirror::Object>, kWithReadBarrier, true>(
&image_roots);
DCHECK_EQ(image_roots, result);
return result;
}
ArtMethod* ImageHeader::GetImageMethod(ImageMethod index) const {
CHECK_LT(static_cast<size_t>(index), kImageMethodsCount);
return reinterpret_cast<ArtMethod*>(image_methods_[index]);
}
void ImageHeader::SetImageMethod(ImageMethod index, ArtMethod* method) {
CHECK_LT(static_cast<size_t>(index), kImageMethodsCount);
image_methods_[index] = reinterpret_cast<uint64_t>(method);
}
const ImageSection& ImageHeader::GetImageSection(ImageSections index) const {
CHECK_LT(static_cast<size_t>(index), kSectionCount);
return sections_[index];
}
std::ostream& operator<<(std::ostream& os, const ImageSection& section) {
return os << "size=" << section.Size() << " range=" << section.Offset() << "-" << section.End();
}
} // namespace art
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