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/*
* Copyright (C) 2016 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 _LIBUNWINDSTACK_MEMORY_H
#define _LIBUNWINDSTACK_MEMORY_H
#include <stdint.h>
#include <sys/types.h>
#include <unistd.h>
#include <atomic>
#include <map>
#include <memory>
#include <string>
#include <vector>
namespace unwindstack {
class Memory {
public:
Memory() = default;
virtual ~Memory() = default;
static std::shared_ptr<Memory> CreateProcessMemory(pid_t pid);
virtual bool ReadString(uint64_t addr, std::string* string, uint64_t max_read = UINT64_MAX);
virtual size_t Read(uint64_t addr, void* dst, size_t size) = 0;
bool ReadFully(uint64_t addr, void* dst, size_t size);
inline bool Read32(uint64_t addr, uint32_t* dst) {
return ReadFully(addr, dst, sizeof(uint32_t));
}
inline bool Read64(uint64_t addr, uint64_t* dst) {
return ReadFully(addr, dst, sizeof(uint64_t));
}
};
class MemoryBuffer : public Memory {
public:
MemoryBuffer() = default;
virtual ~MemoryBuffer() = default;
size_t Read(uint64_t addr, void* dst, size_t size) override;
uint8_t* GetPtr(size_t offset);
void Resize(size_t size) { raw_.resize(size); }
uint64_t Size() { return raw_.size(); }
private:
std::vector<uint8_t> raw_;
};
class MemoryFileAtOffset : public Memory {
public:
MemoryFileAtOffset() = default;
virtual ~MemoryFileAtOffset();
bool Init(const std::string& file, uint64_t offset, uint64_t size = UINT64_MAX);
size_t Read(uint64_t addr, void* dst, size_t size) override;
size_t Size() { return size_; }
void Clear();
protected:
size_t size_ = 0;
size_t offset_ = 0;
uint8_t* data_ = nullptr;
};
class MemoryRemote : public Memory {
public:
MemoryRemote(pid_t pid) : pid_(pid), read_redirect_func_(0) {}
virtual ~MemoryRemote() = default;
size_t Read(uint64_t addr, void* dst, size_t size) override;
pid_t pid() { return pid_; }
private:
pid_t pid_;
std::atomic_uintptr_t read_redirect_func_;
};
class MemoryLocal : public Memory {
public:
MemoryLocal() = default;
virtual ~MemoryLocal() = default;
size_t Read(uint64_t addr, void* dst, size_t size) override;
};
// MemoryRange maps one address range onto another.
// The range [src_begin, src_begin + length) in the underlying Memory is mapped onto offset,
// such that range.read(offset) is equivalent to underlying.read(src_begin).
class MemoryRange : public Memory {
public:
MemoryRange(const std::shared_ptr<Memory>& memory, uint64_t begin, uint64_t length,
uint64_t offset);
virtual ~MemoryRange() = default;
size_t Read(uint64_t addr, void* dst, size_t size) override;
uint64_t offset() { return offset_; }
uint64_t length() { return length_; }
private:
std::shared_ptr<Memory> memory_;
uint64_t begin_;
uint64_t length_;
uint64_t offset_;
};
class MemoryRanges : public Memory {
public:
MemoryRanges() = default;
virtual ~MemoryRanges() = default;
void Insert(MemoryRange* memory);
size_t Read(uint64_t addr, void* dst, size_t size) override;
private:
std::map<uint64_t, std::unique_ptr<MemoryRange>> maps_;
};
class MemoryOffline : public Memory {
public:
MemoryOffline() = default;
virtual ~MemoryOffline() = default;
bool Init(const std::string& file, uint64_t offset);
size_t Read(uint64_t addr, void* dst, size_t size) override;
private:
std::unique_ptr<MemoryRange> memory_;
};
class MemoryOfflineBuffer : public Memory {
public:
MemoryOfflineBuffer(const uint8_t* data, uint64_t start, uint64_t end);
virtual ~MemoryOfflineBuffer() = default;
void Reset(const uint8_t* data, uint64_t start, uint64_t end);
size_t Read(uint64_t addr, void* dst, size_t size) override;
private:
const uint8_t* data_;
uint64_t start_;
uint64_t end_;
};
class MemoryOfflineParts : public Memory {
public:
MemoryOfflineParts() = default;
virtual ~MemoryOfflineParts();
void Add(MemoryOffline* memory) { memories_.push_back(memory); }
size_t Read(uint64_t addr, void* dst, size_t size) override;
private:
std::vector<MemoryOffline*> memories_;
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_MEMORY_H
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