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/*
* Copyright (C) 2014 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.
*/
#ifndef ART_COMPILER_ELF_PATCHER_H_
#define ART_COMPILER_ELF_PATCHER_H_
#include "base/mutex.h"
#include "driver/compiler_driver.h"
#include "elf_file.h"
#include "mirror/art_method.h"
#include "mirror/class.h"
#include "mirror/object.h"
#include "oat_file.h"
#include "oat.h"
#include "os.h"
namespace art {
class ElfPatcher {
public:
typedef void* (*ImageAddressCallback)(void* data, mirror::Object* obj);
static bool Patch(const CompilerDriver* driver, ElfFile* elf_file,
const std::string& oat_location,
ImageAddressCallback cb, void* cb_data,
std::string* error_msg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static bool Patch(const CompilerDriver* driver, ElfFile* elf_file,
const OatFile* oat_file, uintptr_t oat_data_begin,
ImageAddressCallback cb, void* cb_data,
std::string* error_msg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
static bool Patch(const CompilerDriver* driver, ElfFile* elf_file,
const std::string& oat_location,
std::string* error_msg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
return ElfPatcher::Patch(driver, elf_file, oat_location,
DefaultImageAddressCallback, nullptr, error_msg);
}
static bool Patch(const CompilerDriver* driver, ElfFile* elf_file,
const OatFile* oat_file, uintptr_t oat_data_begin,
std::string* error_msg)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
return ElfPatcher::Patch(driver, elf_file, oat_file, oat_data_begin,
DefaultImageAddressCallback, nullptr, error_msg);
}
private:
ElfPatcher(const CompilerDriver* driver, ElfFile* elf_file, const OatFile* oat_file,
OatHeader* oat_header, uintptr_t oat_data_begin,
ImageAddressCallback cb, void* cb_data, std::string* error_msg)
: compiler_driver_(driver), elf_file_(elf_file), oat_file_(oat_file),
oat_header_(oat_header), oat_data_begin_(oat_data_begin), get_image_address_(cb),
cb_data_(cb_data), error_msg_(error_msg),
write_patches_(compiler_driver_->GetCompilerOptions().GetIncludePatchInformation()) {}
~ElfPatcher() {}
static void* DefaultImageAddressCallback(void* data_unused, mirror::Object* obj) {
return static_cast<void*>(obj);
}
bool PatchElf()
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::ArtMethod* GetTargetMethod(const CompilerDriver::CallPatchInformation* patch)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
mirror::Class* GetTargetType(const CompilerDriver::TypePatchInformation* patch)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void AddPatch(uintptr_t off);
void SetPatchLocation(const CompilerDriver::PatchInformation* patch, uint32_t value)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Takes the pointer into the oat_file_ and get the pointer in to the ElfFile.
uint32_t* GetPatchLocation(uintptr_t patch_ptr);
bool WriteOutPatchData();
uintptr_t GetBaseAddressFor(const OatFile* f) {
if (f == oat_file_) {
return oat_data_begin_;
} else {
return reinterpret_cast<uintptr_t>(f->Begin());
}
}
const CompilerDriver* compiler_driver_;
// The elf_file containing the oat_data we are patching up
ElfFile* elf_file_;
// The oat_file that is actually loaded.
const OatFile* oat_file_;
// The oat_header_ within the elf_file_
OatHeader* oat_header_;
// Where the elf_file will be loaded during normal runs.
uintptr_t oat_data_begin_;
// Callback to get image addresses.
ImageAddressCallback get_image_address_;
void* cb_data_;
std::string* error_msg_;
std::vector<uintptr_t> patches_;
std::set<uintptr_t> patches_set_;
bool write_patches_;
DISALLOW_COPY_AND_ASSIGN(ElfPatcher);
};
} // namespace art
#endif // ART_COMPILER_ELF_PATCHER_H_
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