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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_REGS_H
#define _LIBUNWINDSTACK_REGS_H
#include <stdint.h>
#include <functional>
#include <string>
#include <vector>
namespace unwindstack {
// Forward declarations.
class Elf;
enum ArchEnum : uint8_t;
class Memory;
class Regs {
public:
enum LocationEnum : uint8_t {
LOCATION_UNKNOWN = 0,
LOCATION_REGISTER,
LOCATION_SP_OFFSET,
};
struct Location {
Location(LocationEnum type, int16_t value) : type(type), value(value) {}
LocationEnum type;
int16_t value;
};
Regs(uint16_t total_regs, uint16_t sp_reg, const Location& return_loc)
: total_regs_(total_regs), sp_reg_(sp_reg), return_loc_(return_loc) {}
virtual ~Regs() = default;
virtual ArchEnum Arch() = 0;
virtual bool Is32Bit() = 0;
virtual void* RawData() = 0;
virtual uint64_t pc() = 0;
virtual uint64_t sp() = 0;
virtual uint64_t GetAdjustedPc(uint64_t rel_pc, Elf* elf) = 0;
virtual bool StepIfSignalHandler(uint64_t rel_pc, Elf* elf, Memory* process_memory) = 0;
virtual void SetFromRaw() = 0;
virtual bool SetPcFromReturnAddress(Memory* process_memory) = 0;
virtual void IterateRegisters(std::function<void(const char*, uint64_t)>) = 0;
uint16_t sp_reg() { return sp_reg_; }
uint16_t total_regs() { return total_regs_; }
static ArchEnum CurrentArch();
static Regs* RemoteGet(pid_t pid);
static Regs* CreateFromUcontext(ArchEnum arch, void* ucontext);
static Regs* CreateFromLocal();
protected:
uint16_t total_regs_;
uint16_t sp_reg_;
Location return_loc_;
};
template <typename AddressType>
class RegsImpl : public Regs {
public:
RegsImpl(uint16_t total_regs, uint16_t sp_reg, Location return_loc)
: Regs(total_regs, sp_reg, return_loc), regs_(total_regs) {}
virtual ~RegsImpl() = default;
uint64_t pc() override { return pc_; }
uint64_t sp() override { return sp_; }
void set_pc(AddressType pc) { pc_ = pc; }
void set_sp(AddressType sp) { sp_ = sp; }
bool Is32Bit() override { return sizeof(AddressType) == sizeof(uint32_t); }
inline AddressType& operator[](size_t reg) { return regs_[reg]; }
void* RawData() override { return regs_.data(); }
virtual void IterateRegisters(std::function<void(const char*, uint64_t)> fn) override {
for (size_t i = 0; i < regs_.size(); ++i) {
fn(std::to_string(i).c_str(), regs_[i]);
}
}
protected:
AddressType pc_;
AddressType sp_;
std::vector<AddressType> regs_;
};
} // namespace unwindstack
#endif // _LIBUNWINDSTACK_REGS_H
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