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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 <string>
#include <vector>
#include "Check.h"
class Memory {
public:
Memory() = default;
virtual ~Memory() = default;
virtual bool ReadString(uint64_t addr, std::string* string, uint64_t max_read = UINT64_MAX);
virtual bool Read(uint64_t addr, void* dst, size_t size) = 0;
inline bool ReadField(uint64_t addr, void* start, void* field, size_t size) {
if (reinterpret_cast<uintptr_t>(field) < reinterpret_cast<uintptr_t>(start)) {
return false;
}
uint64_t offset = reinterpret_cast<uintptr_t>(field) - reinterpret_cast<uintptr_t>(start);
if (__builtin_add_overflow(addr, offset, &offset)) {
return false;
}
// The read will check if offset + size overflows.
return Read(offset, field, size);
}
inline bool Read32(uint64_t addr, uint32_t* dst) {
return Read(addr, dst, sizeof(uint32_t));
}
inline bool Read64(uint64_t addr, uint64_t* dst) {
return Read(addr, dst, sizeof(uint64_t));
}
};
class MemoryBuffer : public Memory {
public:
MemoryBuffer() = default;
virtual ~MemoryBuffer() = default;
bool 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);
bool Read(uint64_t addr, void* dst, size_t size) override;
void Clear();
protected:
size_t size_ = 0;
size_t offset_ = 0;
uint8_t* data_ = nullptr;
};
class MemoryOffline : public MemoryFileAtOffset {
public:
MemoryOffline() = default;
virtual ~MemoryOffline() = default;
bool Init(const std::string& file, uint64_t offset);
bool Read(uint64_t addr, void* dst, size_t size) override;
private:
uint64_t start_;
};
class MemoryRemote : public Memory {
public:
MemoryRemote(pid_t pid) : pid_(pid) {}
virtual ~MemoryRemote() = default;
bool Read(uint64_t addr, void* dst, size_t size) override;
pid_t pid() { return pid_; }
protected:
virtual bool PtraceRead(uint64_t addr, long* value);
private:
pid_t pid_;
};
class MemoryLocal : public Memory {
public:
MemoryLocal() = default;
virtual ~MemoryLocal() = default;
bool Read(uint64_t addr, void* dst, size_t size) override;
};
class MemoryRange : public Memory {
public:
MemoryRange(Memory* memory, uint64_t begin, uint64_t end)
: memory_(memory), begin_(begin), length_(end - begin) {
CHECK(end > begin);
}
virtual ~MemoryRange() { delete memory_; }
bool Read(uint64_t addr, void* dst, size_t size) override;
private:
Memory* memory_;
uint64_t begin_;
uint64_t length_;
};
#endif // _LIBUNWINDSTACK_MEMORY_H
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