lldb/source/Plugins/Process/Utility/RegisterContextDarwin_x86_64.cpp

//===-- RegisterContextDarwin_x86_64.cpp ----------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include <cinttypes>
#include <cstdarg>
#include <cstddef>

#include <memory>

#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/DataExtractor.h"
#include "lldb/Utility/Endian.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegisterValue.h"
#include "lldb/Utility/Scalar.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Compiler.h"

#include "RegisterContextDarwin_x86_64.h"

using namespace lldb;
using namespace lldb_private;

enum {
  gpr_rax = 0,
  gpr_rbx,
  gpr_rcx,
  gpr_rdx,
  gpr_rdi,
  gpr_rsi,
  gpr_rbp,
  gpr_rsp,
  gpr_r8,
  gpr_r9,
  gpr_r10,
  gpr_r11,
  gpr_r12,
  gpr_r13,
  gpr_r14,
  gpr_r15,
  gpr_rip,
  gpr_rflags,
  gpr_cs,
  gpr_fs,
  gpr_gs,

  fpu_fcw,
  fpu_fsw,
  fpu_ftw,
  fpu_fop,
  fpu_ip,
  fpu_cs,
  fpu_dp,
  fpu_ds,
  fpu_mxcsr,
  fpu_mxcsrmask,
  fpu_stmm0,
  fpu_stmm1,
  fpu_stmm2,
  fpu_stmm3,
  fpu_stmm4,
  fpu_stmm5,
  fpu_stmm6,
  fpu_stmm7,
  fpu_xmm0,
  fpu_xmm1,
  fpu_xmm2,
  fpu_xmm3,
  fpu_xmm4,
  fpu_xmm5,
  fpu_xmm6,
  fpu_xmm7,
  fpu_xmm8,
  fpu_xmm9,
  fpu_xmm10,
  fpu_xmm11,
  fpu_xmm12,
  fpu_xmm13,
  fpu_xmm14,
  fpu_xmm15,

  exc_trapno,
  exc_err,
  exc_faultvaddr,

  k_num_registers,

  // Aliases
  fpu_fctrl = fpu_fcw,
  fpu_fstat = fpu_fsw,
  fpu_ftag = fpu_ftw,
  fpu_fiseg = fpu_cs,
  fpu_fioff = fpu_ip,
  fpu_foseg = fpu_ds,
  fpu_fooff = fpu_dp
};

enum ehframe_dwarf_regnums {
  ehframe_dwarf_gpr_rax = 0,
  ehframe_dwarf_gpr_rdx,
  ehframe_dwarf_gpr_rcx,
  ehframe_dwarf_gpr_rbx,
  ehframe_dwarf_gpr_rsi,
  ehframe_dwarf_gpr_rdi,
  ehframe_dwarf_gpr_rbp,
  ehframe_dwarf_gpr_rsp,
  ehframe_dwarf_gpr_r8,
  ehframe_dwarf_gpr_r9,
  ehframe_dwarf_gpr_r10,
  ehframe_dwarf_gpr_r11,
  ehframe_dwarf_gpr_r12,
  ehframe_dwarf_gpr_r13,
  ehframe_dwarf_gpr_r14,
  ehframe_dwarf_gpr_r15,
  ehframe_dwarf_gpr_rip,
  ehframe_dwarf_fpu_xmm0,
  ehframe_dwarf_fpu_xmm1,
  ehframe_dwarf_fpu_xmm2,
  ehframe_dwarf_fpu_xmm3,
  ehframe_dwarf_fpu_xmm4,
  ehframe_dwarf_fpu_xmm5,
  ehframe_dwarf_fpu_xmm6,
  ehframe_dwarf_fpu_xmm7,
  ehframe_dwarf_fpu_xmm8,
  ehframe_dwarf_fpu_xmm9,
  ehframe_dwarf_fpu_xmm10,
  ehframe_dwarf_fpu_xmm11,
  ehframe_dwarf_fpu_xmm12,
  ehframe_dwarf_fpu_xmm13,
  ehframe_dwarf_fpu_xmm14,
  ehframe_dwarf_fpu_xmm15,
  ehframe_dwarf_fpu_stmm0,
  ehframe_dwarf_fpu_stmm1,
  ehframe_dwarf_fpu_stmm2,
  ehframe_dwarf_fpu_stmm3,
  ehframe_dwarf_fpu_stmm4,
  ehframe_dwarf_fpu_stmm5,
  ehframe_dwarf_fpu_stmm6,
  ehframe_dwarf_fpu_stmm7

};

#define GPR_OFFSET(reg)                                                        \
  (LLVM_EXTENSION offsetof(RegisterContextDarwin_x86_64::GPR, reg))
#define FPU_OFFSET(reg)                                                        \
  (LLVM_EXTENSION offsetof(RegisterContextDarwin_x86_64::FPU, reg) +           \
   sizeof(RegisterContextDarwin_x86_64::GPR))
#define EXC_OFFSET(reg)                                                        \
  (LLVM_EXTENSION offsetof(RegisterContextDarwin_x86_64::EXC, reg) +           \
   sizeof(RegisterContextDarwin_x86_64::GPR) +                                 \
   sizeof(RegisterContextDarwin_x86_64::FPU))

// These macros will auto define the register name, alt name, register size,
// register offset, encoding, format and native register. This ensures that the
// register state structures are defined correctly and have the correct sizes
// and offsets.
#define DEFINE_GPR(reg, alt)                                                   \
  #reg, alt, sizeof(((RegisterContextDarwin_x86_64::GPR *) NULL)->reg),        \
                    GPR_OFFSET(reg), eEncodingUint, eFormatHex
#define DEFINE_FPU_UINT(reg)                                                   \
  #reg, NULL, sizeof(((RegisterContextDarwin_x86_64::FPU *) NULL)->reg),       \
                     FPU_OFFSET(reg), eEncodingUint, eFormatHex
#define DEFINE_FPU_VECT(reg, i)                                                \
  #reg #i, NULL,                                                               \
      sizeof(((RegisterContextDarwin_x86_64::FPU *) NULL)->reg[i].bytes),      \
              FPU_OFFSET(reg[i]), eEncodingVector, eFormatVectorOfUInt8,       \
                         {ehframe_dwarf_fpu_##reg##i,                          \
                          ehframe_dwarf_fpu_##reg##i, LLDB_INVALID_REGNUM,     \
                          LLDB_INVALID_REGNUM, fpu_##reg##i },                 \
                          nullptr, nullptr, nullptr,
#define DEFINE_EXC(reg)                                                        \
  #reg, NULL, sizeof(((RegisterContextDarwin_x86_64::EXC *) NULL)->reg),       \
                     EXC_OFFSET(reg), eEncodingUint, eFormatHex

#define REG_CONTEXT_SIZE                                                       \
  (sizeof(RegisterContextDarwin_x86_64::GPR) +                                 \
   sizeof(RegisterContextDarwin_x86_64::FPU) +                                 \
   sizeof(RegisterContextDarwin_x86_64::EXC))

// General purpose registers for 64 bit
static RegisterInfo g_register_infos[] = {
    {DEFINE_GPR(rax, nullptr),
     {ehframe_dwarf_gpr_rax, ehframe_dwarf_gpr_rax, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_rax},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rbx, nullptr),
     {ehframe_dwarf_gpr_rbx, ehframe_dwarf_gpr_rbx, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_rbx},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rcx, nullptr),
     {ehframe_dwarf_gpr_rcx, ehframe_dwarf_gpr_rcx, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_rcx},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rdx, nullptr),
     {ehframe_dwarf_gpr_rdx, ehframe_dwarf_gpr_rdx, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_rdx},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rdi, nullptr),
     {ehframe_dwarf_gpr_rdi, ehframe_dwarf_gpr_rdi, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_rdi},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rsi, nullptr),
     {ehframe_dwarf_gpr_rsi, ehframe_dwarf_gpr_rsi, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_rsi},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rbp, "fp"),
     {ehframe_dwarf_gpr_rbp, ehframe_dwarf_gpr_rbp, LLDB_REGNUM_GENERIC_FP,
      LLDB_INVALID_REGNUM, gpr_rbp},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rsp, "sp"),
     {ehframe_dwarf_gpr_rsp, ehframe_dwarf_gpr_rsp, LLDB_REGNUM_GENERIC_SP,
      LLDB_INVALID_REGNUM, gpr_rsp},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r8, nullptr),
     {ehframe_dwarf_gpr_r8, ehframe_dwarf_gpr_r8, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r8},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r9, nullptr),
     {ehframe_dwarf_gpr_r9, ehframe_dwarf_gpr_r9, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r9},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r10, nullptr),
     {ehframe_dwarf_gpr_r10, ehframe_dwarf_gpr_r10, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r10},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r11, nullptr),
     {ehframe_dwarf_gpr_r11, ehframe_dwarf_gpr_r11, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r11},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r12, nullptr),
     {ehframe_dwarf_gpr_r12, ehframe_dwarf_gpr_r12, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r12},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r13, nullptr),
     {ehframe_dwarf_gpr_r13, ehframe_dwarf_gpr_r13, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r13},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r14, nullptr),
     {ehframe_dwarf_gpr_r14, ehframe_dwarf_gpr_r14, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r14},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(r15, nullptr),
     {ehframe_dwarf_gpr_r15, ehframe_dwarf_gpr_r15, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_r15},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rip, "pc"),
     {ehframe_dwarf_gpr_rip, ehframe_dwarf_gpr_rip, LLDB_REGNUM_GENERIC_PC,
      LLDB_INVALID_REGNUM, gpr_rip},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(rflags, "flags"),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_REGNUM_GENERIC_FLAGS,
      LLDB_INVALID_REGNUM, gpr_rflags},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(cs, nullptr),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_cs},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(fs, nullptr),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_fs},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_GPR(gs, nullptr),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, gpr_gs},
     nullptr,
     nullptr,
     nullptr,
    },

    {DEFINE_FPU_UINT(fcw),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_fcw},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(fsw),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_fsw},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(ftw),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_ftw},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(fop),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_fop},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(ip),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_ip},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(cs),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_cs},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(dp),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_dp},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(ds),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_ds},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(mxcsr),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_mxcsr},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_UINT(mxcsrmask),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, fpu_mxcsrmask},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_FPU_VECT(stmm, 0)},
    {DEFINE_FPU_VECT(stmm, 1)},
    {DEFINE_FPU_VECT(stmm, 2)},
    {DEFINE_FPU_VECT(stmm, 3)},
    {DEFINE_FPU_VECT(stmm, 4)},
    {DEFINE_FPU_VECT(stmm, 5)},
    {DEFINE_FPU_VECT(stmm, 6)},
    {DEFINE_FPU_VECT(stmm, 7)},
    {DEFINE_FPU_VECT(xmm, 0)},
    {DEFINE_FPU_VECT(xmm, 1)},
    {DEFINE_FPU_VECT(xmm, 2)},
    {DEFINE_FPU_VECT(xmm, 3)},
    {DEFINE_FPU_VECT(xmm, 4)},
    {DEFINE_FPU_VECT(xmm, 5)},
    {DEFINE_FPU_VECT(xmm, 6)},
    {DEFINE_FPU_VECT(xmm, 7)},
    {DEFINE_FPU_VECT(xmm, 8)},
    {DEFINE_FPU_VECT(xmm, 9)},
    {DEFINE_FPU_VECT(xmm, 10)},
    {DEFINE_FPU_VECT(xmm, 11)},
    {DEFINE_FPU_VECT(xmm, 12)},
    {DEFINE_FPU_VECT(xmm, 13)},
    {DEFINE_FPU_VECT(xmm, 14)},
    {DEFINE_FPU_VECT(xmm, 15)},

    {DEFINE_EXC(trapno),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, exc_trapno},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_EXC(err),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, exc_err},
     nullptr,
     nullptr,
     nullptr,
    },
    {DEFINE_EXC(faultvaddr),
     {LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM,
      LLDB_INVALID_REGNUM, exc_faultvaddr},
     nullptr,
     nullptr,
     nullptr,
     }};

static size_t k_num_register_infos = std::size(g_register_infos);

RegisterContextDarwin_x86_64::RegisterContextDarwin_x86_64(
    Thread &thread, uint32_t concrete_frame_idx)
    : RegisterContext(thread, concrete_frame_idx), gpr(), fpu(), exc() {
  uint32_t i;
  for (i = 0; i < kNumErrors; i++) {
    gpr_errs[i] = -1;
    fpu_errs[i] = -1;
    exc_errs[i] = -1;
  }
}

RegisterContextDarwin_x86_64::~RegisterContextDarwin_x86_64() = default;

void RegisterContextDarwin_x86_64::InvalidateAllRegisters() {
  InvalidateAllRegisterStates();
}

size_t RegisterContextDarwin_x86_64::GetRegisterCount() {
  assert(k_num_register_infos == k_num_registers);
  return k_num_registers;
}

const RegisterInfo *
RegisterContextDarwin_x86_64::GetRegisterInfoAtIndex(size_t reg) {
  assert(k_num_register_infos == k_num_registers);
  if (reg < k_num_registers)
    return &g_register_infos[reg];
  return nullptr;
}

size_t RegisterContextDarwin_x86_64::GetRegisterInfosCount() {
  return k_num_register_infos;
}

const lldb_private::RegisterInfo *
RegisterContextDarwin_x86_64::GetRegisterInfos() {
  return g_register_infos;
}

static uint32_t g_gpr_regnums[] = {
    gpr_rax, gpr_rbx, gpr_rcx, gpr_rdx,    gpr_rdi, gpr_rsi, gpr_rbp,
    gpr_rsp, gpr_r8,  gpr_r9,  gpr_r10,    gpr_r11, gpr_r12, gpr_r13,
    gpr_r14, gpr_r15, gpr_rip, gpr_rflags, gpr_cs,  gpr_fs,  gpr_gs};

static uint32_t g_fpu_regnums[] = {
    fpu_fcw,   fpu_fsw,   fpu_ftw,   fpu_fop,       fpu_ip,    fpu_cs,
    fpu_dp,    fpu_ds,    fpu_mxcsr, fpu_mxcsrmask, fpu_stmm0, fpu_stmm1,
    fpu_stmm2, fpu_stmm3, fpu_stmm4, fpu_stmm5,     fpu_stmm6, fpu_stmm7,
    fpu_xmm0,  fpu_xmm1,  fpu_xmm2,  fpu_xmm3,      fpu_xmm4,  fpu_xmm5,
    fpu_xmm6,  fpu_xmm7,  fpu_xmm8,  fpu_xmm9,      fpu_xmm10, fpu_xmm11,
    fpu_xmm12, fpu_xmm13, fpu_xmm14, fpu_xmm15};

static uint32_t g_exc_regnums[] = {exc_trapno, exc_err, exc_faultvaddr};

// Number of registers in each register set
const size_t k_num_gpr_registers = std::size(g_gpr_regnums);
const size_t k_num_fpu_registers = std::size(g_fpu_regnums);
const size_t k_num_exc_registers = std::size(g_exc_regnums);

// Register set definitions. The first definitions at register set index of
// zero is for all registers, followed by other registers sets. The register
// information for the all register set need not be filled in.
static const RegisterSet g_reg_sets[] = {
    {
        "General Purpose Registers", "gpr", k_num_gpr_registers, g_gpr_regnums,
    },
    {"Floating Point Registers", "fpu", k_num_fpu_registers, g_fpu_regnums},
    {"Exception State Registers", "exc", k_num_exc_registers, g_exc_regnums}};

const size_t k_num_regsets = std::size(g_reg_sets);

size_t RegisterContextDarwin_x86_64::GetRegisterSetCount() {
  return k_num_regsets;
}

const RegisterSet *
RegisterContextDarwin_x86_64::GetRegisterSet(size_t reg_set) {
  if (reg_set < k_num_regsets)
    return &g_reg_sets[reg_set];
  return nullptr;
}

int RegisterContextDarwin_x86_64::GetSetForNativeRegNum(int reg_num) {
  if (reg_num < fpu_fcw)
    return GPRRegSet;
  else if (reg_num < exc_trapno)
    return FPURegSet;
  else if (reg_num < k_num_registers)
    return EXCRegSet;
  return -1;
}

int RegisterContextDarwin_x86_64::ReadGPR(bool force) {
  int set = GPRRegSet;
  if (force || !RegisterSetIsCached(set)) {
    SetError(set, Read, DoReadGPR(GetThreadID(), set, gpr));
  }
  return GetError(GPRRegSet, Read);
}

int RegisterContextDarwin_x86_64::ReadFPU(bool force) {
  int set = FPURegSet;
  if (force || !RegisterSetIsCached(set)) {
    SetError(set, Read, DoReadFPU(GetThreadID(), set, fpu));
  }
  return GetError(FPURegSet, Read);
}

int RegisterContextDarwin_x86_64::ReadEXC(bool force) {
  int set = EXCRegSet;
  if (force || !RegisterSetIsCached(set)) {
    SetError(set, Read, DoReadEXC(GetThreadID(), set, exc));
  }
  return GetError(EXCRegSet, Read);
}

int RegisterContextDarwin_x86_64::WriteGPR() {
  int set = GPRRegSet;
  if (!RegisterSetIsCached(set)) {
    SetError(set, Write, -1);
    return -1;
  }
  SetError(set, Write, DoWriteGPR(GetThreadID(), set, gpr));
  SetError(set, Read, -1);
  return GetError(set, Write);
}

int RegisterContextDarwin_x86_64::WriteFPU() {
  int set = FPURegSet;
  if (!RegisterSetIsCached(set)) {
    SetError(set, Write, -1);
    return -1;
  }
  SetError(set, Write, DoWriteFPU(GetThreadID(), set, fpu));
  SetError(set, Read, -1);
  return GetError(set, Write);
}

int RegisterContextDarwin_x86_64::WriteEXC() {
  int set = EXCRegSet;
  if (!RegisterSetIsCached(set)) {
    SetError(set, Write, -1);
    return -1;
  }
  SetError(set, Write, DoWriteEXC(GetThreadID(), set, exc));
  SetError(set, Read, -1);
  return GetError(set, Write);
}

int RegisterContextDarwin_x86_64::ReadRegisterSet(uint32_t set, bool force) {
  switch (set) {
  case GPRRegSet:
    return ReadGPR(force);
  case FPURegSet:
    return ReadFPU(force);
  case EXCRegSet:
    return ReadEXC(force);
  default:
    break;
  }
  return -1;
}

int RegisterContextDarwin_x86_64::WriteRegisterSet(uint32_t set) {
  // Make sure we have a valid context to set.
  switch (set) {
  case GPRRegSet:
    return WriteGPR();
  case FPURegSet:
    return WriteFPU();
  case EXCRegSet:
    return WriteEXC();
  default:
    break;
  }
  return -1;
}

bool RegisterContextDarwin_x86_64::ReadRegister(const RegisterInfo *reg_info,
                                                RegisterValue &value) {
  const uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
  int set = RegisterContextDarwin_x86_64::GetSetForNativeRegNum(reg);
  if (set == -1)
    return false;

  if (ReadRegisterSet(set, false) != 0)
    return false;

  switch (reg) {
  case gpr_rax:
  case gpr_rbx:
  case gpr_rcx:
  case gpr_rdx:
  case gpr_rdi:
  case gpr_rsi:
  case gpr_rbp:
  case gpr_rsp:
  case gpr_r8:
  case gpr_r9:
  case gpr_r10:
  case gpr_r11:
  case gpr_r12:
  case gpr_r13:
  case gpr_r14:
  case gpr_r15:
  case gpr_rip:
  case gpr_rflags:
  case gpr_cs:
  case gpr_fs:
  case gpr_gs:
    value = (&gpr.rax)[reg - gpr_rax];
    break;

  case fpu_fcw:
    value = fpu.fcw;
    break;

  case fpu_fsw:
    value = fpu.fsw;
    break;

  case fpu_ftw:
    value = fpu.ftw;
    break;

  case fpu_fop:
    value = fpu.fop;
    break;

  case fpu_ip:
    value = fpu.ip;
    break;

  case fpu_cs:
    value = fpu.cs;
    break;

  case fpu_dp:
    value = fpu.dp;
    break;

  case fpu_ds:
    value = fpu.ds;
    break;

  case fpu_mxcsr:
    value = fpu.mxcsr;
    break;

  case fpu_mxcsrmask:
    value = fpu.mxcsrmask;
    break;

  case fpu_stmm0:
  case fpu_stmm1:
  case fpu_stmm2:
  case fpu_stmm3:
  case fpu_stmm4:
  case fpu_stmm5:
  case fpu_stmm6:
  case fpu_stmm7:
    value.SetBytes(fpu.stmm[reg - fpu_stmm0].bytes, reg_info->byte_size,
                   endian::InlHostByteOrder());
    break;

  case fpu_xmm0:
  case fpu_xmm1:
  case fpu_xmm2:
  case fpu_xmm3:
  case fpu_xmm4:
  case fpu_xmm5:
  case fpu_xmm6:
  case fpu_xmm7:
  case fpu_xmm8:
  case fpu_xmm9:
  case fpu_xmm10:
  case fpu_xmm11:
  case fpu_xmm12:
  case fpu_xmm13:
  case fpu_xmm14:
  case fpu_xmm15:
    value.SetBytes(fpu.xmm[reg - fpu_xmm0].bytes, reg_info->byte_size,
                   endian::InlHostByteOrder());
    break;

  case exc_trapno:
    value = exc.trapno;
    break;

  case exc_err:
    value = exc.err;
    break;

  case exc_faultvaddr:
    value = exc.faultvaddr;
    break;

  default:
    return false;
  }
  return true;
}

bool RegisterContextDarwin_x86_64::WriteRegister(const RegisterInfo *reg_info,
                                                 const RegisterValue &value) {
  const uint32_t reg = reg_info->kinds[eRegisterKindLLDB];
  int set = RegisterContextDarwin_x86_64::GetSetForNativeRegNum(reg);

  if (set == -1)
    return false;

  if (ReadRegisterSet(set, false) != 0)
    return false;

  switch (reg) {
  case gpr_rax:
  case gpr_rbx:
  case gpr_rcx:
  case gpr_rdx:
  case gpr_rdi:
  case gpr_rsi:
  case gpr_rbp:
  case gpr_rsp:
  case gpr_r8:
  case gpr_r9:
  case gpr_r10:
  case gpr_r11:
  case gpr_r12:
  case gpr_r13:
  case gpr_r14:
  case gpr_r15:
  case gpr_rip:
  case gpr_rflags:
  case gpr_cs:
  case gpr_fs:
  case gpr_gs:
    (&gpr.rax)[reg - gpr_rax] = value.GetAsUInt64();
    break;

  case fpu_fcw:
    fpu.fcw = value.GetAsUInt16();
    break;

  case fpu_fsw:
    fpu.fsw = value.GetAsUInt16();
    break;

  case fpu_ftw:
    fpu.ftw = value.GetAsUInt8();
    break;

  case fpu_fop:
    fpu.fop = value.GetAsUInt16();
    break;

  case fpu_ip:
    fpu.ip = value.GetAsUInt32();
    break;

  case fpu_cs:
    fpu.cs = value.GetAsUInt16();
    break;

  case fpu_dp:
    fpu.dp = value.GetAsUInt32();
    break;

  case fpu_ds:
    fpu.ds = value.GetAsUInt16();
    break;

  case fpu_mxcsr:
    fpu.mxcsr = value.GetAsUInt32();
    break;

  case fpu_mxcsrmask:
    fpu.mxcsrmask = value.GetAsUInt32();
    break;

  case fpu_stmm0:
  case fpu_stmm1:
  case fpu_stmm2:
  case fpu_stmm3:
  case fpu_stmm4:
  case fpu_stmm5:
  case fpu_stmm6:
  case fpu_stmm7:
    ::memcpy(fpu.stmm[reg - fpu_stmm0].bytes, value.GetBytes(),
             value.GetByteSize());
    break;

  case fpu_xmm0:
  case fpu_xmm1:
  case fpu_xmm2:
  case fpu_xmm3:
  case fpu_xmm4:
  case fpu_xmm5:
  case fpu_xmm6:
  case fpu_xmm7:
  case fpu_xmm8:
  case fpu_xmm9:
  case fpu_xmm10:
  case fpu_xmm11:
  case fpu_xmm12:
  case fpu_xmm13:
  case fpu_xmm14:
  case fpu_xmm15:
    ::memcpy(fpu.xmm[reg - fpu_xmm0].bytes, value.GetBytes(),
             value.GetByteSize());
    return false;

  case exc_trapno:
    exc.trapno = value.GetAsUInt32();
    break;

  case exc_err:
    exc.err = value.GetAsUInt32();
    break;

  case exc_faultvaddr:
    exc.faultvaddr = value.GetAsUInt64();
    break;

  default:
    return false;
  }
  return WriteRegisterSet(set) == 0;
}

bool RegisterContextDarwin_x86_64::ReadAllRegisterValues(
    lldb::WritableDataBufferSP &data_sp) {
  data_sp = std::make_shared<DataBufferHeap>(REG_CONTEXT_SIZE, 0);
  if (ReadGPR(false) == 0 && ReadFPU(false) == 0 && ReadEXC(false) == 0) {
    uint8_t *dst = data_sp->GetBytes();
    ::memcpy(dst, &gpr, sizeof(gpr));
    dst += sizeof(gpr);

    ::memcpy(dst, &fpu, sizeof(fpu));
    dst += sizeof(gpr);

    ::memcpy(dst, &exc, sizeof(exc));
    return true;
  }
  return false;
}

bool RegisterContextDarwin_x86_64::WriteAllRegisterValues(
    const lldb::DataBufferSP &data_sp) {
  if (data_sp && data_sp->GetByteSize() == REG_CONTEXT_SIZE) {
    const uint8_t *src = data_sp->GetBytes();
    ::memcpy(&gpr, src, sizeof(gpr));
    src += sizeof(gpr);

    ::memcpy(&fpu, src, sizeof(fpu));
    src += sizeof(gpr);

    ::memcpy(&exc, src, sizeof(exc));
    uint32_t success_count = 0;
    if (WriteGPR() == 0)
      ++success_count;
    if (WriteFPU() == 0)
      ++success_count;
    if (WriteEXC() == 0)
      ++success_count;
    return success_count == 3;
  }
  return false;
}

uint32_t RegisterContextDarwin_x86_64::ConvertRegisterKindToRegisterNumber(
    lldb::RegisterKind kind, uint32_t reg) {
  if (kind == eRegisterKindGeneric) {
    switch (reg) {
    case LLDB_REGNUM_GENERIC_PC:
      return gpr_rip;
    case LLDB_REGNUM_GENERIC_SP:
      return gpr_rsp;
    case LLDB_REGNUM_GENERIC_FP:
      return gpr_rbp;
    case LLDB_REGNUM_GENERIC_FLAGS:
      return gpr_rflags;
    case LLDB_REGNUM_GENERIC_RA:
    default:
      break;
    }
  } else if (kind == eRegisterKindEHFrame || kind == eRegisterKindDWARF) {
    switch (reg) {
    case ehframe_dwarf_gpr_rax:
      return gpr_rax;
    case ehframe_dwarf_gpr_rdx:
      return gpr_rdx;
    case ehframe_dwarf_gpr_rcx:
      return gpr_rcx;
    case ehframe_dwarf_gpr_rbx:
      return gpr_rbx;
    case ehframe_dwarf_gpr_rsi:
      return gpr_rsi;
    case ehframe_dwarf_gpr_rdi:
      return gpr_rdi;
    case ehframe_dwarf_gpr_rbp:
      return gpr_rbp;
    case ehframe_dwarf_gpr_rsp:
      return gpr_rsp;
    case ehframe_dwarf_gpr_r8:
      return gpr_r8;
    case ehframe_dwarf_gpr_r9:
      return gpr_r9;
    case ehframe_dwarf_gpr_r10:
      return gpr_r10;
    case ehframe_dwarf_gpr_r11:
      return gpr_r11;
    case ehframe_dwarf_gpr_r12:
      return gpr_r12;
    case ehframe_dwarf_gpr_r13:
      return gpr_r13;
    case ehframe_dwarf_gpr_r14:
      return gpr_r14;
    case ehframe_dwarf_gpr_r15:
      return gpr_r15;
    case ehframe_dwarf_gpr_rip:
      return gpr_rip;
    case ehframe_dwarf_fpu_xmm0:
      return fpu_xmm0;
    case ehframe_dwarf_fpu_xmm1:
      return fpu_xmm1;
    case ehframe_dwarf_fpu_xmm2:
      return fpu_xmm2;
    case ehframe_dwarf_fpu_xmm3:
      return fpu_xmm3;
    case ehframe_dwarf_fpu_xmm4:
      return fpu_xmm4;
    case ehframe_dwarf_fpu_xmm5:
      return fpu_xmm5;
    case ehframe_dwarf_fpu_xmm6:
      return fpu_xmm6;
    case ehframe_dwarf_fpu_xmm7:
      return fpu_xmm7;
    case ehframe_dwarf_fpu_xmm8:
      return fpu_xmm8;
    case ehframe_dwarf_fpu_xmm9:
      return fpu_xmm9;
    case ehframe_dwarf_fpu_xmm10:
      return fpu_xmm10;
    case ehframe_dwarf_fpu_xmm11:
      return fpu_xmm11;
    case ehframe_dwarf_fpu_xmm12:
      return fpu_xmm12;
    case ehframe_dwarf_fpu_xmm13:
      return fpu_xmm13;
    case ehframe_dwarf_fpu_xmm14:
      return fpu_xmm14;
    case ehframe_dwarf_fpu_xmm15:
      return fpu_xmm15;
    case ehframe_dwarf_fpu_stmm0:
      return fpu_stmm0;
    case ehframe_dwarf_fpu_stmm1:
      return fpu_stmm1;
    case ehframe_dwarf_fpu_stmm2:
      return fpu_stmm2;
    case ehframe_dwarf_fpu_stmm3:
      return fpu_stmm3;
    case ehframe_dwarf_fpu_stmm4:
      return fpu_stmm4;
    case ehframe_dwarf_fpu_stmm5:
      return fpu_stmm5;
    case ehframe_dwarf_fpu_stmm6:
      return fpu_stmm6;
    case ehframe_dwarf_fpu_stmm7:
      return fpu_stmm7;
    default:
      break;
    }
  } else if (kind == eRegisterKindLLDB) {
    return reg;
  }
  return LLDB_INVALID_REGNUM;
}

bool RegisterContextDarwin_x86_64::HardwareSingleStep(bool enable) {
  if (ReadGPR(true) != 0)
    return false;

  const uint64_t trace_bit = 0x100ull;
  if (enable) {

    if (gpr.rflags & trace_bit)
      return true; // trace bit is already set, there is nothing to do
    else
      gpr.rflags |= trace_bit;
  } else {
    if (gpr.rflags & trace_bit)
      gpr.rflags &= ~trace_bit;
    else
      return true; // trace bit is clear, there is nothing to do
  }

  return WriteGPR() == 0;
}