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      1 /*
      2  * Copyright (C) 2012 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 "elf_writer.h"
     18 
     19 #include "art_method-inl.h"
     20 #include "base/unix_file/fd_file.h"
     21 #include "class_linker.h"
     22 #include "dex_file-inl.h"
     23 #include "dex_method_iterator.h"
     24 #include "driver/compiler_driver.h"
     25 #include "elf_file.h"
     26 #include "invoke_type.h"
     27 #include "mirror/object-inl.h"
     28 #include "oat.h"
     29 #include "scoped_thread_state_change.h"
     30 
     31 namespace art {
     32 
     33 uintptr_t ElfWriter::GetOatDataAddress(ElfFile* elf_file) {
     34   uintptr_t oatdata_address = elf_file->FindSymbolAddress(SHT_DYNSYM,
     35                                                            "oatdata",
     36                                                            false);
     37   CHECK_NE(0U, oatdata_address);
     38   return oatdata_address;
     39 }
     40 
     41 void ElfWriter::GetOatElfInformation(File* file,
     42                                      size_t* oat_loaded_size,
     43                                      size_t* oat_data_offset) {
     44   std::string error_msg;
     45   std::unique_ptr<ElfFile> elf_file(ElfFile::Open(file,
     46                                                   false,
     47                                                   false,
     48                                                   /*low_4gb*/false,
     49                                                   &error_msg));
     50   CHECK(elf_file.get() != nullptr) << error_msg;
     51 
     52   bool success = elf_file->GetLoadedSize(oat_loaded_size, &error_msg);
     53   CHECK(success) << error_msg;
     54   CHECK_NE(0U, *oat_loaded_size);
     55   *oat_data_offset = GetOatDataAddress(elf_file.get());
     56   CHECK_NE(0U, *oat_data_offset);
     57 }
     58 
     59 bool ElfWriter::Fixup(File* file, uintptr_t oat_data_begin) {
     60   std::string error_msg;
     61   std::unique_ptr<ElfFile> elf_file(ElfFile::Open(file, true, false, /*low_4gb*/false, &error_msg));
     62   CHECK(elf_file.get() != nullptr) << error_msg;
     63 
     64   // Lookup "oatdata" symbol address.
     65   uintptr_t oatdata_address = ElfWriter::GetOatDataAddress(elf_file.get());
     66   uintptr_t base_address = oat_data_begin - oatdata_address;
     67 
     68   return elf_file->Fixup(base_address);
     69 }
     70 
     71 }  // namespace art
     72