| /* |
| * 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 |