RegisterContextDarwin_i386.h

//===-- RegisterContextDarwin_i386.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_SOURCE_PLUGINS_PROCESS_UTILITY_REGISTERCONTEXTDARWIN_I386_H
#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_REGISTERCONTEXTDARWIN_I386_H

#include "lldb/Target/RegisterContext.h"
#include "lldb/lldb-private.h"

class RegisterContextDarwin_i386 : public lldb_private::RegisterContext {
public:
  RegisterContextDarwin_i386(lldb_private::Thread &thread,
                             uint32_t concrete_frame_idx);

  ~RegisterContextDarwin_i386() override;

  void InvalidateAllRegisters() override;

  size_t GetRegisterCount() override;

  const lldb_private::RegisterInfo *GetRegisterInfoAtIndex(size_t reg) override;

  size_t GetRegisterSetCount() override;

  const lldb_private::RegisterSet *GetRegisterSet(size_t set) override;

  bool ReadRegister(const lldb_private::RegisterInfo *reg_info,
                    lldb_private::RegisterValue &value) override;

  bool WriteRegister(const lldb_private::RegisterInfo *reg_info,
                     const lldb_private::RegisterValue &value) override;

  bool ReadAllRegisterValues(lldb::WritableDataBufferSP &data_sp) override;

  bool WriteAllRegisterValues(const lldb::DataBufferSP &data_sp) override;

  uint32_t ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,
                                               uint32_t num) override;

  bool HardwareSingleStep(bool enable) override;

  struct GPR {
    uint32_t eax;
    uint32_t ebx;
    uint32_t ecx;
    uint32_t edx;
    uint32_t edi;
    uint32_t esi;
    uint32_t ebp;
    uint32_t esp;
    uint32_t ss;
    uint32_t eflags;
    uint32_t eip;
    uint32_t cs;
    uint32_t ds;
    uint32_t es;
    uint32_t fs;
    uint32_t gs;
  };

  struct MMSReg {
    uint8_t bytes[10];
    uint8_t pad[6];
  };

  struct XMMReg {
    uint8_t bytes[16];
  };

  struct FPU {
    uint32_t pad[2];
    uint16_t fcw;
    uint16_t fsw;
    uint8_t ftw;
    uint8_t pad1;
    uint16_t fop;
    uint32_t ip;
    uint16_t cs;
    uint16_t pad2;
    uint32_t dp;
    uint16_t ds;
    uint16_t pad3;
    uint32_t mxcsr;
    uint32_t mxcsrmask;
    MMSReg stmm[8];
    XMMReg xmm[8];
    uint8_t pad4[14 * 16];
    int pad5;
  };

  struct EXC {
    uint32_t trapno;
    uint32_t err;
    uint32_t faultvaddr;
  };

protected:
  enum { GPRRegSet = 1, FPURegSet = 2, EXCRegSet = 3 };

  enum {
    GPRWordCount = sizeof(GPR) / sizeof(uint32_t),
    FPUWordCount = sizeof(FPU) / sizeof(uint32_t),
    EXCWordCount = sizeof(EXC) / sizeof(uint32_t)
  };

  enum { Read = 0, Write = 1, kNumErrors = 2 };

  GPR gpr;
  FPU fpu;
  EXC exc;
  int gpr_errs[2]; // Read/Write errors
  int fpu_errs[2]; // Read/Write errors
  int exc_errs[2]; // Read/Write errors

  void InvalidateAllRegisterStates() {
    SetError(GPRRegSet, Read, -1);
    SetError(FPURegSet, Read, -1);
    SetError(EXCRegSet, Read, -1);
  }

  int GetError(int flavor, uint32_t err_idx) const {
    if (err_idx < kNumErrors) {
      switch (flavor) {
      // When getting all errors, just OR all values together to see if
      // we got any kind of error.
      case GPRRegSet:
        return gpr_errs[err_idx];
      case FPURegSet:
        return fpu_errs[err_idx];
      case EXCRegSet:
        return exc_errs[err_idx];
      default:
        break;
      }
    }
    return -1;
  }

  bool SetError(int flavor, uint32_t err_idx, int err) {
    if (err_idx < kNumErrors) {
      switch (flavor) {
      case GPRRegSet:
        gpr_errs[err_idx] = err;
        return true;

      case FPURegSet:
        fpu_errs[err_idx] = err;
        return true;

      case EXCRegSet:
        exc_errs[err_idx] = err;
        return true;

      default:
        break;
      }
    }
    return false;
  }

  bool RegisterSetIsCached(int set) const { return GetError(set, Read) == 0; }

  void LogGPR(lldb_private::Log *log, const char *title);

  int ReadGPR(bool force);

  int ReadFPU(bool force);

  int ReadEXC(bool force);

  int WriteGPR();

  int WriteFPU();

  int WriteEXC();

  // Subclasses override these to do the actual reading.
  virtual int DoReadGPR(lldb::tid_t tid, int flavor, GPR &gpr) = 0;

  virtual int DoReadFPU(lldb::tid_t tid, int flavor, FPU &fpu) = 0;

  virtual int DoReadEXC(lldb::tid_t tid, int flavor, EXC &exc) = 0;

  virtual int DoWriteGPR(lldb::tid_t tid, int flavor, const GPR &gpr) = 0;

  virtual int DoWriteFPU(lldb::tid_t tid, int flavor, const FPU &fpu) = 0;

  virtual int DoWriteEXC(lldb::tid_t tid, int flavor, const EXC &exc) = 0;

  int ReadRegisterSet(uint32_t set, bool force);

  int WriteRegisterSet(uint32_t set);

  static uint32_t GetRegisterNumber(uint32_t reg_kind, uint32_t reg_num);

  static int GetSetForNativeRegNum(int reg_num);

  static size_t GetRegisterInfosCount();

  static const lldb_private::RegisterInfo *GetRegisterInfos();
};

#endif // LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_REGISTERCONTEXTDARWIN_I386_H