NativeRegisterContext.h

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//===-- NativeRegisterContext.h ---------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#ifndef LLDB_HOST_COMMON_NATIVEREGISTERCONTEXT_H
#define LLDB_HOST_COMMON_NATIVEREGISTERCONTEXT_H
 
#include "lldb/Host/common/NativeWatchpointList.h"
#include "lldb/Utility/RegisterInfo.h"
#include "lldb/lldb-private.h"
 
namespace lldb_private {
 
class NativeThreadProtocol;
 
enum class ExpeditedRegs { Minimal, Full };
 
class NativeRegisterContext
    : public std::enable_shared_from_this<NativeRegisterContext> {
public:
  // Constructors and Destructors
  NativeRegisterContext(NativeThreadProtocol &thread);
 
  virtual ~NativeRegisterContext();
 
  // void
  // InvalidateIfNeeded (bool force);
 
  // Subclasses must override these functions
  // virtual void
  // InvalidateAllRegisters () = 0;
 
  virtual uint32_t GetRegisterCount() const = 0;
 
  virtual uint32_t GetUserRegisterCount() const = 0;
 
  virtual const RegisterInfo *GetRegisterInfoAtIndex(uint32_t reg) const = 0;
 
  const char *GetRegisterSetNameForRegisterAtIndex(uint32_t reg_index) const;
 
  virtual uint32_t GetRegisterSetCount() const = 0;
 
  virtual const RegisterSet *GetRegisterSet(uint32_t set_index) const = 0;
 
  virtual Status ReadRegister(const RegisterInfo *reg_info,
                              RegisterValue &reg_value) = 0;
 
  virtual Status WriteRegister(const RegisterInfo *reg_info,
                               const RegisterValue &reg_value) = 0;
 
  virtual Status ReadAllRegisterValues(lldb::WritableDataBufferSP &data_sp) = 0;
 
  virtual Status WriteAllRegisterValues(const lldb::DataBufferSP &data_sp) = 0;
 
  uint32_t ConvertRegisterKindToRegisterNumber(uint32_t kind,
                                               uint32_t num) const;
 
  // Subclasses can override these functions if desired
  virtual uint32_t NumSupportedHardwareBreakpoints();
 
  virtual uint32_t SetHardwareBreakpoint(lldb::addr_t addr, size_t size);
 
  virtual bool ClearHardwareBreakpoint(uint32_t hw_idx);
 
  virtual Status ClearAllHardwareBreakpoints();
 
  virtual Status GetHardwareBreakHitIndex(uint32_t &bp_index,
                                          lldb::addr_t trap_addr);
 
  virtual uint32_t NumSupportedHardwareWatchpoints();
 
  virtual uint32_t SetHardwareWatchpoint(lldb::addr_t addr, size_t size,
                                         uint32_t watch_flags);
 
  virtual bool ClearHardwareWatchpoint(uint32_t hw_index);
 
  virtual Status ClearWatchpointHit(uint32_t hw_index);
 
  virtual Status ClearAllHardwareWatchpoints();
 
  virtual Status IsWatchpointHit(uint32_t wp_index, bool &is_hit);
 
  virtual Status GetWatchpointHitIndex(uint32_t &wp_index,
                                       lldb::addr_t trap_addr);
 
  virtual Status IsWatchpointVacant(uint32_t wp_index, bool &is_vacant);
 
  virtual lldb::addr_t GetWatchpointAddress(uint32_t wp_index);
 
  // MIPS Linux kernel returns a masked address (last 3bits are masked)
  // when a HW watchpoint is hit. However user may not have set a watchpoint on
  // this address. This function emulates the instruction at PC and finds the
  // base address used in the load/store instruction. This gives the exact
  // address used to read/write the variable being watched. For example: 'n' is
  // at 0x120010d00 and 'm' is 0x120010d04. When a watchpoint is set at 'm',
  // then watch exception is generated even when 'n' is read/written. This
  // function returns address of 'n' so that client can check whether a
  // watchpoint is set on this address or not.
  virtual lldb::addr_t GetWatchpointHitAddress(uint32_t wp_index);
 
  virtual bool HardwareSingleStep(bool enable);
 
  virtual Status
  ReadRegisterValueFromMemory(const lldb_private::RegisterInfo *reg_info,
                              lldb::addr_t src_addr, size_t src_len,
                              RegisterValue &reg_value);
 
  virtual Status
  WriteRegisterValueToMemory(const lldb_private::RegisterInfo *reg_info,
                             lldb::addr_t dst_addr, size_t dst_len,
                             const RegisterValue &reg_value);
 
  // Subclasses should not override these
  virtual lldb::tid_t GetThreadID() const;
 
  virtual NativeThreadProtocol &GetThread() { return m_thread; }
 
  virtual std::vector<uint32_t>
  GetExpeditedRegisters(ExpeditedRegs expType) const;
 
  virtual bool RegisterOffsetIsDynamic() const { return false; }
 
  const RegisterInfo *GetRegisterInfoByName(llvm::StringRef reg_name,
                                            uint32_t start_idx = 0);
 
  const RegisterInfo *GetRegisterInfo(uint32_t reg_kind, uint32_t reg_num);
 
  lldb::addr_t GetPC(lldb::addr_t fail_value = LLDB_INVALID_ADDRESS);
 
  virtual lldb::addr_t
  GetPCfromBreakpointLocation(lldb::addr_t fail_value = LLDB_INVALID_ADDRESS);
 
  Status SetPC(lldb::addr_t pc);
 
  lldb::addr_t GetSP(lldb::addr_t fail_value = LLDB_INVALID_ADDRESS);
 
  Status SetSP(lldb::addr_t sp);
 
  lldb::addr_t GetFP(lldb::addr_t fail_value = LLDB_INVALID_ADDRESS);
 
  Status SetFP(lldb::addr_t fp);
 
  const char *GetRegisterName(uint32_t reg);
 
  lldb::addr_t GetReturnAddress(lldb::addr_t fail_value = LLDB_INVALID_ADDRESS);
 
  lldb::addr_t GetFlags(lldb::addr_t fail_value = 0);
 
  lldb::addr_t ReadRegisterAsUnsigned(uint32_t reg, lldb::addr_t fail_value);
 
  lldb::addr_t ReadRegisterAsUnsigned(const RegisterInfo *reg_info,
                                      lldb::addr_t fail_value);
 
  Status WriteRegisterFromUnsigned(uint32_t reg, uint64_t uval);
 
  Status WriteRegisterFromUnsigned(const RegisterInfo *reg_info, uint64_t uval);
 
  // uint32_t
  // GetStopID () const
  // {
  //     return m_stop_id;
  // }
 
  // void
  // SetStopID (uint32_t stop_id)
  // {
  //     m_stop_id = stop_id;
  // }
 
protected:
  // Classes that inherit from RegisterContext can see and modify these
  NativeThreadProtocol
      &m_thread; // The thread that this register context belongs to.
  // uint32_t m_stop_id;             // The stop ID that any data in this
  // context is valid for
 
private:
  // For RegisterContext only
  NativeRegisterContext(const NativeRegisterContext &) = delete;
  const NativeRegisterContext &
  operator=(const NativeRegisterContext &) = delete;
};
 
} // namespace lldb_private
 
#endif // LLDB_HOST_COMMON_NATIVEREGISTERCONTEXT_H