path: root/lldb/source/Plugins/Process/NetBSD/NativeRegisterContextNetBSD_x86_64.cpp

//===-- NativeRegisterContextNetBSD_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
//
//===----------------------------------------------------------------------===//

#if defined(__i386__) || defined(__x86_64__)

#include "NativeRegisterContextNetBSD_x86_64.h"

#include "lldb/Host/HostInfo.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegisterValue.h"
#include "lldb/Utility/Status.h"

#include "Plugins/Process/Utility/RegisterContextNetBSD_i386.h"
#include "Plugins/Process/Utility/RegisterContextNetBSD_x86_64.h"

// clang-format off
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <x86/cpu.h>
#include <x86/cpu_extended_state.h>
#include <x86/specialreg.h>
#include <elf.h>
#include <err.h>
#include <stdint.h>
#include <stdlib.h>
// clang-format on

using namespace lldb_private;
using namespace lldb_private::process_netbsd;

// Private namespace.

namespace {
// x86 64-bit general purpose registers.
static const uint32_t g_gpr_regnums_x86_64[] = {
    lldb_rax_x86_64,    lldb_rbx_x86_64,    lldb_rcx_x86_64, lldb_rdx_x86_64,
    lldb_rdi_x86_64,    lldb_rsi_x86_64,    lldb_rbp_x86_64, lldb_rsp_x86_64,
    lldb_r8_x86_64,     lldb_r9_x86_64,     lldb_r10_x86_64, lldb_r11_x86_64,
    lldb_r12_x86_64,    lldb_r13_x86_64,    lldb_r14_x86_64, lldb_r15_x86_64,
    lldb_rip_x86_64,    lldb_rflags_x86_64, lldb_cs_x86_64,  lldb_fs_x86_64,
    lldb_gs_x86_64,     lldb_ss_x86_64,     lldb_ds_x86_64,  lldb_es_x86_64,
    lldb_eax_x86_64,    lldb_ebx_x86_64,    lldb_ecx_x86_64, lldb_edx_x86_64,
    lldb_edi_x86_64,    lldb_esi_x86_64,    lldb_ebp_x86_64, lldb_esp_x86_64,
    lldb_r8d_x86_64,  // Low 32 bits or r8
    lldb_r9d_x86_64,  // Low 32 bits or r9
    lldb_r10d_x86_64, // Low 32 bits or r10
    lldb_r11d_x86_64, // Low 32 bits or r11
    lldb_r12d_x86_64, // Low 32 bits or r12
    lldb_r13d_x86_64, // Low 32 bits or r13
    lldb_r14d_x86_64, // Low 32 bits or r14
    lldb_r15d_x86_64, // Low 32 bits or r15
    lldb_ax_x86_64,     lldb_bx_x86_64,     lldb_cx_x86_64,  lldb_dx_x86_64,
    lldb_di_x86_64,     lldb_si_x86_64,     lldb_bp_x86_64,  lldb_sp_x86_64,
    lldb_r8w_x86_64,  // Low 16 bits or r8
    lldb_r9w_x86_64,  // Low 16 bits or r9
    lldb_r10w_x86_64, // Low 16 bits or r10
    lldb_r11w_x86_64, // Low 16 bits or r11
    lldb_r12w_x86_64, // Low 16 bits or r12
    lldb_r13w_x86_64, // Low 16 bits or r13
    lldb_r14w_x86_64, // Low 16 bits or r14
    lldb_r15w_x86_64, // Low 16 bits or r15
    lldb_ah_x86_64,     lldb_bh_x86_64,     lldb_ch_x86_64,  lldb_dh_x86_64,
    lldb_al_x86_64,     lldb_bl_x86_64,     lldb_cl_x86_64,  lldb_dl_x86_64,
    lldb_dil_x86_64,    lldb_sil_x86_64,    lldb_bpl_x86_64, lldb_spl_x86_64,
    lldb_r8l_x86_64,    // Low 8 bits or r8
    lldb_r9l_x86_64,    // Low 8 bits or r9
    lldb_r10l_x86_64,   // Low 8 bits or r10
    lldb_r11l_x86_64,   // Low 8 bits or r11
    lldb_r12l_x86_64,   // Low 8 bits or r12
    lldb_r13l_x86_64,   // Low 8 bits or r13
    lldb_r14l_x86_64,   // Low 8 bits or r14
    lldb_r15l_x86_64,   // Low 8 bits or r15
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_gpr_regnums_x86_64) / sizeof(g_gpr_regnums_x86_64[0])) -
                      1 ==
                  k_num_gpr_registers_x86_64,
              "g_gpr_regnums_x86_64 has wrong number of register infos");

// x86 64-bit floating point registers.
static const uint32_t g_fpu_regnums_x86_64[] = {
    lldb_fctrl_x86_64,     lldb_fstat_x86_64, lldb_ftag_x86_64,
    lldb_fop_x86_64,       lldb_fiseg_x86_64, lldb_fioff_x86_64,
    lldb_foseg_x86_64,     lldb_fooff_x86_64, lldb_mxcsr_x86_64,
    lldb_mxcsrmask_x86_64, lldb_st0_x86_64,   lldb_st1_x86_64,
    lldb_st2_x86_64,       lldb_st3_x86_64,   lldb_st4_x86_64,
    lldb_st5_x86_64,       lldb_st6_x86_64,   lldb_st7_x86_64,
    lldb_mm0_x86_64,       lldb_mm1_x86_64,   lldb_mm2_x86_64,
    lldb_mm3_x86_64,       lldb_mm4_x86_64,   lldb_mm5_x86_64,
    lldb_mm6_x86_64,       lldb_mm7_x86_64,   lldb_xmm0_x86_64,
    lldb_xmm1_x86_64,      lldb_xmm2_x86_64,  lldb_xmm3_x86_64,
    lldb_xmm4_x86_64,      lldb_xmm5_x86_64,  lldb_xmm6_x86_64,
    lldb_xmm7_x86_64,      lldb_xmm8_x86_64,  lldb_xmm9_x86_64,
    lldb_xmm10_x86_64,     lldb_xmm11_x86_64, lldb_xmm12_x86_64,
    lldb_xmm13_x86_64,     lldb_xmm14_x86_64, lldb_xmm15_x86_64,
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_fpu_regnums_x86_64) / sizeof(g_fpu_regnums_x86_64[0])) -
                      1 ==
                  k_num_fpr_registers_x86_64,
              "g_fpu_regnums_x86_64 has wrong number of register infos");

// x86 64-bit registers available via XState.
static const uint32_t g_xstate_regnums_x86_64[] = {
    lldb_ymm0_x86_64,   lldb_ymm1_x86_64,  lldb_ymm2_x86_64,  lldb_ymm3_x86_64,
    lldb_ymm4_x86_64,   lldb_ymm5_x86_64,  lldb_ymm6_x86_64,  lldb_ymm7_x86_64,
    lldb_ymm8_x86_64,   lldb_ymm9_x86_64,  lldb_ymm10_x86_64, lldb_ymm11_x86_64,
    lldb_ymm12_x86_64,  lldb_ymm13_x86_64, lldb_ymm14_x86_64, lldb_ymm15_x86_64,
    // Note: we currently do not provide them but this is needed to avoid
    // unnamed groups in SBFrame::GetRegisterContext().
    lldb_bnd0_x86_64,    lldb_bnd1_x86_64,    lldb_bnd2_x86_64,
    lldb_bnd3_x86_64,    lldb_bndcfgu_x86_64, lldb_bndstatus_x86_64,
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_xstate_regnums_x86_64) / sizeof(g_xstate_regnums_x86_64[0])) -
                      1 ==
                  k_num_avx_registers_x86_64 + k_num_mpx_registers_x86_64,
              "g_xstate_regnums_x86_64 has wrong number of register infos");

// x86 debug registers.
static const uint32_t g_dbr_regnums_x86_64[] = {
    lldb_dr0_x86_64,   lldb_dr1_x86_64,  lldb_dr2_x86_64,  lldb_dr3_x86_64,
    lldb_dr4_x86_64,   lldb_dr5_x86_64,  lldb_dr6_x86_64,  lldb_dr7_x86_64,
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_dbr_regnums_x86_64) / sizeof(g_dbr_regnums_x86_64[0])) -
                      1 ==
                  k_num_dbr_registers_x86_64,
              "g_dbr_regnums_x86_64 has wrong number of register infos");

// x86 32-bit general purpose registers.
const uint32_t g_gpr_regnums_i386[] = {
    lldb_eax_i386,      lldb_ebx_i386,    lldb_ecx_i386, lldb_edx_i386,
    lldb_edi_i386,      lldb_esi_i386,    lldb_ebp_i386, lldb_esp_i386,
    lldb_eip_i386,      lldb_eflags_i386, lldb_cs_i386,  lldb_fs_i386,
    lldb_gs_i386,       lldb_ss_i386,     lldb_ds_i386,  lldb_es_i386,
    lldb_ax_i386,       lldb_bx_i386,     lldb_cx_i386,  lldb_dx_i386,
    lldb_di_i386,       lldb_si_i386,     lldb_bp_i386,  lldb_sp_i386,
    lldb_ah_i386,       lldb_bh_i386,     lldb_ch_i386,  lldb_dh_i386,
    lldb_al_i386,       lldb_bl_i386,     lldb_cl_i386,  lldb_dl_i386,
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_gpr_regnums_i386) / sizeof(g_gpr_regnums_i386[0])) -
                      1 ==
                  k_num_gpr_registers_i386,
              "g_gpr_regnums_i386 has wrong number of register infos");

// x86 32-bit floating point registers.
const uint32_t g_fpu_regnums_i386[] = {
    lldb_fctrl_i386,    lldb_fstat_i386,     lldb_ftag_i386,  lldb_fop_i386,
    lldb_fiseg_i386,    lldb_fioff_i386,     lldb_foseg_i386, lldb_fooff_i386,
    lldb_mxcsr_i386,    lldb_mxcsrmask_i386, lldb_st0_i386,   lldb_st1_i386,
    lldb_st2_i386,      lldb_st3_i386,       lldb_st4_i386,   lldb_st5_i386,
    lldb_st6_i386,      lldb_st7_i386,       lldb_mm0_i386,   lldb_mm1_i386,
    lldb_mm2_i386,      lldb_mm3_i386,       lldb_mm4_i386,   lldb_mm5_i386,
    lldb_mm6_i386,      lldb_mm7_i386,       lldb_xmm0_i386,  lldb_xmm1_i386,
    lldb_xmm2_i386,     lldb_xmm3_i386,      lldb_xmm4_i386,  lldb_xmm5_i386,
    lldb_xmm6_i386,     lldb_xmm7_i386,
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_fpu_regnums_i386) / sizeof(g_fpu_regnums_i386[0])) -
                      1 ==
                  k_num_fpr_registers_i386,
              "g_fpu_regnums_i386 has wrong number of register infos");

// x86 64-bit registers available via XState.
static const uint32_t g_xstate_regnums_i386[] = {
    lldb_ymm0_i386,     lldb_ymm1_i386,  lldb_ymm2_i386,  lldb_ymm3_i386,
    lldb_ymm4_i386,     lldb_ymm5_i386,  lldb_ymm6_i386,  lldb_ymm7_i386,
    // Note: we currently do not provide them but this is needed to avoid
    // unnamed groups in SBFrame::GetRegisterContext().
    lldb_bnd0_i386,      lldb_bnd1_i386,    lldb_bnd2_i386,
    lldb_bnd3_i386,      lldb_bndcfgu_i386, lldb_bndstatus_i386,
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_xstate_regnums_i386) / sizeof(g_xstate_regnums_i386[0])) -
                      1 ==
                  k_num_avx_registers_i386 + k_num_mpx_registers_i386,
              "g_xstate_regnums_i386 has wrong number of register infos");

// x86 debug registers.
static const uint32_t g_dbr_regnums_i386[] = {
    lldb_dr0_i386,   lldb_dr1_i386,  lldb_dr2_i386,  lldb_dr3_i386,
    lldb_dr4_i386,   lldb_dr5_i386,  lldb_dr6_i386,  lldb_dr7_i386,
    LLDB_INVALID_REGNUM // register sets need to end with this flag
};
static_assert((sizeof(g_dbr_regnums_i386) / sizeof(g_dbr_regnums_i386[0])) -
                      1 ==
                  k_num_dbr_registers_i386,
              "g_dbr_regnums_i386 has wrong number of register infos");


// Number of register sets provided by this context.
enum { k_num_register_sets = 4 };

// Register sets for x86 32-bit.
static const RegisterSet g_reg_sets_i386[k_num_register_sets] = {
    {"General Purpose Registers", "gpr", k_num_gpr_registers_i386,
     g_gpr_regnums_i386},
    {"Floating Point Registers", "fpu", k_num_fpr_registers_i386,
     g_fpu_regnums_i386},
    {"Extended State Registers", "xstate",
     k_num_avx_registers_i386 + k_num_mpx_registers_i386,
     g_xstate_regnums_i386},
    {"Debug Registers", "dbr", k_num_dbr_registers_i386,
     g_dbr_regnums_i386},
};

// Register sets for x86 64-bit.
static const RegisterSet g_reg_sets_x86_64[k_num_register_sets] = {
    {"General Purpose Registers", "gpr", k_num_gpr_registers_x86_64,
     g_gpr_regnums_x86_64},
    {"Floating Point Registers", "fpu", k_num_fpr_registers_x86_64,
     g_fpu_regnums_x86_64},
    {"Extended State Registers", "xstate",
     k_num_avx_registers_x86_64 + k_num_mpx_registers_x86_64,
     g_xstate_regnums_x86_64},
    {"Debug Registers", "dbr", k_num_dbr_registers_x86_64,
     g_dbr_regnums_x86_64},
};

#define REG_CONTEXT_SIZE (GetRegisterInfoInterface().GetGPRSize())
} // namespace

NativeRegisterContextNetBSD *
NativeRegisterContextNetBSD::CreateHostNativeRegisterContextNetBSD(
    const ArchSpec &target_arch, NativeThreadProtocol &native_thread) {
  return new NativeRegisterContextNetBSD_x86_64(target_arch, native_thread);
}

// NativeRegisterContextNetBSD_x86_64 members.

static RegisterInfoInterface *
CreateRegisterInfoInterface(const ArchSpec &target_arch) {
  if (HostInfo::GetArchitecture().GetAddressByteSize() == 4) {
    // 32-bit hosts run with a RegisterContextNetBSD_i386 context.
    return new RegisterContextNetBSD_i386(target_arch);
  } else {
    assert((HostInfo::GetArchitecture().GetAddressByteSize() == 8) &&
           "Register setting path assumes this is a 64-bit host");
    // X86_64 hosts know how to work with 64-bit and 32-bit EXEs using the x86_64
    // register context.
    return new RegisterContextNetBSD_x86_64(target_arch);
  }
}

NativeRegisterContextNetBSD_x86_64::NativeRegisterContextNetBSD_x86_64(
    const ArchSpec &target_arch, NativeThreadProtocol &native_thread)
    : NativeRegisterContextNetBSD(native_thread,
                                  CreateRegisterInfoInterface(target_arch)),
      m_gpr(), m_fpr(), m_dbr() {}

// CONSIDER after local and llgs debugging are merged, register set support can
// be moved into a base x86-64 class with IsRegisterSetAvailable made virtual.
uint32_t NativeRegisterContextNetBSD_x86_64::GetRegisterSetCount() const {
  uint32_t sets = 0;
  for (uint32_t set_index = 0; set_index < k_num_register_sets; ++set_index) {
    if (GetSetForNativeRegNum(set_index) != -1)
      ++sets;
  }

  return sets;
}

const RegisterSet *
NativeRegisterContextNetBSD_x86_64::GetRegisterSet(uint32_t set_index) const {
  switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
  case llvm::Triple::x86:
    return &g_reg_sets_i386[set_index];
  case llvm::Triple::x86_64:
    return &g_reg_sets_x86_64[set_index];
  default:
    assert(false && "Unhandled target architecture.");
    return nullptr;
  }

  return nullptr;
}

static constexpr int RegNumX86ToX86_64(int regnum) {
  switch (regnum) {
  case lldb_eax_i386:
    return lldb_rax_x86_64;
  case lldb_ebx_i386:
    return lldb_rbx_x86_64;
  case lldb_ecx_i386:
    return lldb_rcx_x86_64;
  case lldb_edx_i386:
    return lldb_rdx_x86_64;
  case lldb_edi_i386:
    return lldb_rdi_x86_64;
  case lldb_esi_i386:
    return lldb_rsi_x86_64;
  case lldb_ebp_i386:
    return lldb_rbp_x86_64;
  case lldb_esp_i386:
    return lldb_rsp_x86_64;
  case lldb_eip_i386:
    return lldb_rip_x86_64;
  case lldb_eflags_i386:
    return lldb_rflags_x86_64;
  case lldb_cs_i386:
    return lldb_cs_x86_64;
  case lldb_fs_i386:
    return lldb_fs_x86_64;
  case lldb_gs_i386:
    return lldb_gs_x86_64;
  case lldb_ss_i386:
    return lldb_ss_x86_64;
  case lldb_ds_i386:
    return lldb_ds_x86_64;
  case lldb_es_i386:
    return lldb_es_x86_64;
  case lldb_fctrl_i386:
    return lldb_fctrl_x86_64;
  case lldb_fstat_i386:
    return lldb_fstat_x86_64;
  case lldb_ftag_i386:
    return lldb_ftag_x86_64;
  case lldb_fop_i386:
    return lldb_fop_x86_64;
  case lldb_fiseg_i386:
    return lldb_fiseg_x86_64;
  case lldb_fioff_i386:
    return lldb_fioff_x86_64;
  case lldb_foseg_i386:
    return lldb_foseg_x86_64;
  case lldb_fooff_i386:
    return lldb_fooff_x86_64;
  case lldb_mxcsr_i386:
    return lldb_mxcsr_x86_64;
  case lldb_mxcsrmask_i386:
    return lldb_mxcsrmask_x86_64;
  case lldb_st0_i386:
  case lldb_st1_i386:
  case lldb_st2_i386:
  case lldb_st3_i386:
  case lldb_st4_i386:
  case lldb_st5_i386:
  case lldb_st6_i386:
  case lldb_st7_i386:
    return lldb_st0_x86_64 + regnum - lldb_st0_i386;
  case lldb_mm0_i386:
  case lldb_mm1_i386:
  case lldb_mm2_i386:
  case lldb_mm3_i386:
  case lldb_mm4_i386:
  case lldb_mm5_i386:
  case lldb_mm6_i386:
  case lldb_mm7_i386:
    return lldb_mm0_x86_64 + regnum - lldb_mm0_i386;
  case lldb_xmm0_i386:
  case lldb_xmm1_i386:
  case lldb_xmm2_i386:
  case lldb_xmm3_i386:
  case lldb_xmm4_i386:
  case lldb_xmm5_i386:
  case lldb_xmm6_i386:
  case lldb_xmm7_i386:
    return lldb_xmm0_x86_64 + regnum - lldb_xmm0_i386;
  case lldb_ymm0_i386:
  case lldb_ymm1_i386:
  case lldb_ymm2_i386:
  case lldb_ymm3_i386:
  case lldb_ymm4_i386:
  case lldb_ymm5_i386:
  case lldb_ymm6_i386:
  case lldb_ymm7_i386:
    return lldb_ymm0_x86_64 + regnum - lldb_ymm0_i386;
  case lldb_dr0_i386:
  case lldb_dr1_i386:
  case lldb_dr2_i386:
  case lldb_dr3_i386:
  case lldb_dr4_i386:
  case lldb_dr5_i386:
  case lldb_dr6_i386:
  case lldb_dr7_i386:
    return lldb_dr0_x86_64 + regnum - lldb_dr0_i386;
  default:
    assert(false && "Unhandled i386 register.");
    return 0;
  }
}

int NativeRegisterContextNetBSD_x86_64::GetSetForNativeRegNum(
    int reg_num) const {
  switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
  case llvm::Triple::x86:
    if (reg_num <= k_last_gpr_i386)
      return GPRegSet;
    else if (reg_num <= k_last_fpr_i386)
      return FPRegSet;
    else if (reg_num <= k_last_avx_i386)
      return XStateRegSet; // AVX
    else if (reg_num <= lldb_dr7_i386)
      return DBRegSet; // DBR
    else
      return -1;
  case llvm::Triple::x86_64:
    if (reg_num <= k_last_gpr_x86_64)
      return GPRegSet;
    else if (reg_num <= k_last_fpr_x86_64)
      return FPRegSet;
    else if (reg_num <= k_last_avx_x86_64)
      return XStateRegSet; // AVX
    else if (reg_num <= k_last_mpxr_x86_64)
      return -1; // MPXR
    else if (reg_num <= k_last_mpxc_x86_64)
      return -1; // MPXC
    else if (reg_num <= lldb_dr7_x86_64)
      return DBRegSet; // DBR
    else
      return -1;
  default:
    assert(false && "Unhandled target architecture.");
    return -1;
  }
}

Status NativeRegisterContextNetBSD_x86_64::ReadRegisterSet(uint32_t set) {
  switch (set) {
  case GPRegSet:
    return DoRegisterSet(PT_GETREGS, &m_gpr);
  case FPRegSet:
#if defined(__x86_64__)
    return DoRegisterSet(PT_GETFPREGS, &m_fpr);
#else
    return DoRegisterSet(PT_GETXMMREGS, &m_fpr);
#endif
  case DBRegSet:
    return DoRegisterSet(PT_GETDBREGS, &m_dbr);
  case XStateRegSet:
#ifdef HAVE_XSTATE
    {
      struct iovec iov = {&m_xstate, sizeof(m_xstate)};
      return DoRegisterSet(PT_GETXSTATE, &iov);
    }
#else
    return Status("XState is not supported by the kernel");
#endif
  }
  llvm_unreachable("NativeRegisterContextNetBSD_x86_64::ReadRegisterSet");
}

Status NativeRegisterContextNetBSD_x86_64::WriteRegisterSet(uint32_t set) {
  switch (set) {
  case GPRegSet:
    return DoRegisterSet(PT_SETREGS, &m_gpr);
  case FPRegSet:
#if defined(__x86_64__)
    return DoRegisterSet(PT_SETFPREGS, &m_fpr);
#else
    return DoRegisterSet(PT_SETXMMREGS, &m_fpr);
#endif
  case DBRegSet:
    return DoRegisterSet(PT_SETDBREGS, &m_dbr);
  case XStateRegSet:
#ifdef HAVE_XSTATE
    {
      struct iovec iov = {&m_xstate, sizeof(m_xstate)};
      return DoRegisterSet(PT_SETXSTATE, &iov);
    }
#else
    return Status("XState is not supported by the kernel");
#endif
  }
  llvm_unreachable("NativeRegisterContextNetBSD_x86_64::WriteRegisterSet");
}

Status
NativeRegisterContextNetBSD_x86_64::ReadRegister(const RegisterInfo *reg_info,
                                                 RegisterValue &reg_value) {
  Status error;

  if (!reg_info) {
    error.SetErrorString("reg_info NULL");
    return error;
  }

  uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
  if (reg == LLDB_INVALID_REGNUM) {
    // This is likely an internal register for lldb use only and should not be
    // directly queried.
    error.SetErrorStringWithFormat("register \"%s\" is an internal-only lldb "
                                   "register, cannot read directly",
                                   reg_info->name);
    return error;
  }

  int set = GetSetForNativeRegNum(reg);
  if (set == -1) {
    // This is likely an internal register for lldb use only and should not be
    // directly queried.
    error.SetErrorStringWithFormat("register \"%s\" is in unrecognized set",
                                   reg_info->name);
    return error;
  }

  switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
  case llvm::Triple::x86_64:
    break;
  case llvm::Triple::x86:
    reg = RegNumX86ToX86_64(reg);
    break;
  default:
    assert(false && "Unhandled target architecture.");
    error.SetErrorString("Unhandled target architecture.");
    return error;
  }

  error = ReadRegisterSet(set);
  if (error.Fail())
    return error;

  switch (reg) {
#if defined(__x86_64__)
  case lldb_rax_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RAX];
    break;
  case lldb_rbx_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RBX];
    break;
  case lldb_rcx_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RCX];
    break;
  case lldb_rdx_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RDX];
    break;
  case lldb_rdi_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RDI];
    break;
  case lldb_rsi_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RSI];
    break;
  case lldb_rbp_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RBP];
    break;
  case lldb_rsp_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RSP];
    break;
  case lldb_r8_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R8];
    break;
  case lldb_r9_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R9];
    break;
  case lldb_r10_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R10];
    break;
  case lldb_r11_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R11];
    break;
  case lldb_r12_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R12];
    break;
  case lldb_r13_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R13];
    break;
  case lldb_r14_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R14];
    break;
  case lldb_r15_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_R15];
    break;
  case lldb_rip_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RIP];
    break;
  case lldb_rflags_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_RFLAGS];
    break;
  case lldb_cs_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_CS];
    break;
  case lldb_fs_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_FS];
    break;
  case lldb_gs_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_GS];
    break;
  case lldb_ss_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_SS];
    break;
  case lldb_ds_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_DS];
    break;
  case lldb_es_x86_64:
    reg_value = (uint64_t)m_gpr.regs[_REG_ES];
    break;
#else
  case lldb_rax_x86_64:
    reg_value = (uint32_t)m_gpr.r_eax;
    break;
  case lldb_rbx_x86_64:
    reg_value = (uint32_t)m_gpr.r_ebx;
    break;
  case lldb_rcx_x86_64:
    reg_value = (uint32_t)m_gpr.r_ecx;
    break;
  case lldb_rdx_x86_64:
    reg_value = (uint32_t)m_gpr.r_edx;
    break;
  case lldb_rdi_x86_64:
    reg_value = (uint32_t)m_gpr.r_edi;
    break;
  case lldb_rsi_x86_64:
    reg_value = (uint32_t)m_gpr.r_esi;
    break;
  case lldb_rsp_x86_64:
    reg_value = (uint32_t)m_gpr.r_esp;
    break;
  case lldb_rbp_x86_64:
    reg_value = (uint32_t)m_gpr.r_ebp;
    break;
  case lldb_rip_x86_64:
    reg_value = (uint32_t)m_gpr.r_eip;
    break;
  case lldb_rflags_x86_64:
    reg_value = (uint32_t)m_gpr.r_eflags;
    break;
  case lldb_cs_x86_64:
    reg_value = (uint32_t)m_gpr.r_cs;
    break;
  case lldb_fs_x86_64:
    reg_value = (uint32_t)m_gpr.r_fs;
    break;
  case lldb_gs_x86_64:
    reg_value = (uint32_t)m_gpr.r_gs;
    break;
  case lldb_ss_x86_64:
    reg_value = (uint32_t)m_gpr.r_ss;
    break;
  case lldb_ds_x86_64:
    reg_value = (uint32_t)m_gpr.r_ds;
    break;
  case lldb_es_x86_64:
    reg_value = (uint32_t)m_gpr.r_es;
    break;
#endif
  case lldb_fctrl_x86_64:
    reg_value = (uint16_t)m_fpr.fxstate.fx_cw;
    break;
  case lldb_fstat_x86_64:
    reg_value = (uint16_t)m_fpr.fxstate.fx_sw;
    break;
  case lldb_ftag_x86_64:
    reg_value = (uint16_t)m_fpr.fxstate.fx_tw;
    break;
  case lldb_fop_x86_64:
    reg_value = (uint64_t)m_fpr.fxstate.fx_opcode;
    break;
  case lldb_fiseg_x86_64:
    reg_value = (uint32_t)m_fpr.fxstate.fx_ip.fa_32.fa_seg;
    break;
  case lldb_fioff_x86_64:
    reg_value = (uint32_t)m_fpr.fxstate.fx_ip.fa_32.fa_off;
    break;
  case lldb_foseg_x86_64:
    reg_value = (uint32_t)m_fpr.fxstate.fx_dp.fa_32.fa_seg;
    break;
  case lldb_fooff_x86_64:
    reg_value = (uint32_t)m_fpr.fxstate.fx_dp.fa_32.fa_off;
    break;
  case lldb_mxcsr_x86_64:
    reg_value = (uint32_t)m_fpr.fxstate.fx_mxcsr;
    break;
  case lldb_mxcsrmask_x86_64:
    reg_value = (uint32_t)m_fpr.fxstate.fx_mxcsr_mask;
    break;
  case lldb_st0_x86_64:
  case lldb_st1_x86_64:
  case lldb_st2_x86_64:
  case lldb_st3_x86_64:
  case lldb_st4_x86_64:
  case lldb_st5_x86_64:
  case lldb_st6_x86_64:
  case lldb_st7_x86_64:
    reg_value.SetBytes(&m_fpr.fxstate.fx_87_ac[reg - lldb_st0_x86_64],
                       reg_info->byte_size, endian::InlHostByteOrder());
    break;
  case lldb_mm0_x86_64:
  case lldb_mm1_x86_64:
  case lldb_mm2_x86_64:
  case lldb_mm3_x86_64:
  case lldb_mm4_x86_64:
  case lldb_mm5_x86_64:
  case lldb_mm6_x86_64:
  case lldb_mm7_x86_64:
    reg_value.SetBytes(&m_fpr.fxstate.fx_87_ac[reg - lldb_mm0_x86_64],
                       reg_info->byte_size, endian::InlHostByteOrder());
    break;
  case lldb_xmm0_x86_64:
  case lldb_xmm1_x86_64:
  case lldb_xmm2_x86_64:
  case lldb_xmm3_x86_64:
  case lldb_xmm4_x86_64:
  case lldb_xmm5_x86_64:
  case lldb_xmm6_x86_64:
  case lldb_xmm7_x86_64:
  case lldb_xmm8_x86_64:
  case lldb_xmm9_x86_64:
  case lldb_xmm10_x86_64:
  case lldb_xmm11_x86_64:
  case lldb_xmm12_x86_64:
  case lldb_xmm13_x86_64:
  case lldb_xmm14_x86_64:
  case lldb_xmm15_x86_64:
    reg_value.SetBytes(&m_fpr.fxstate.fx_xmm[reg - lldb_xmm0_x86_64],
                       reg_info->byte_size, endian::InlHostByteOrder());
    break;
  case lldb_ymm0_x86_64:
  case lldb_ymm1_x86_64:
  case lldb_ymm2_x86_64:
  case lldb_ymm3_x86_64:
  case lldb_ymm4_x86_64:
  case lldb_ymm5_x86_64:
  case lldb_ymm6_x86_64:
  case lldb_ymm7_x86_64:
  case lldb_ymm8_x86_64:
  case lldb_ymm9_x86_64:
  case lldb_ymm10_x86_64:
  case lldb_ymm11_x86_64:
  case lldb_ymm12_x86_64:
  case lldb_ymm13_x86_64:
  case lldb_ymm14_x86_64:
  case lldb_ymm15_x86_64:
#ifdef HAVE_XSTATE
    if (!(m_xstate.xs_rfbm & XCR0_SSE) ||
        !(m_xstate.xs_rfbm & XCR0_YMM_Hi128)) {
      error.SetErrorStringWithFormat("register \"%s\" not supported by CPU/kernel",
                                     reg_info->name);
    } else {
      uint32_t reg_index = reg - lldb_ymm0_x86_64;
      YMMReg ymm = XStateToYMM(
          m_xstate.xs_fxsave.fx_xmm[reg_index].xmm_bytes,
          m_xstate.xs_ymm_hi128.xs_ymm[reg_index].ymm_bytes);
      reg_value.SetBytes(ymm.bytes, reg_info->byte_size,
                         endian::InlHostByteOrder());
    }
#else
    error.SetErrorString("XState queries not supported by the kernel");
#endif
    break;
  case lldb_dr0_x86_64:
  case lldb_dr1_x86_64:
  case lldb_dr2_x86_64:
  case lldb_dr3_x86_64:
  case lldb_dr4_x86_64:
  case lldb_dr5_x86_64:
  case lldb_dr6_x86_64:
  case lldb_dr7_x86_64:
    reg_value = (uint64_t)m_dbr.dr[reg - lldb_dr0_x86_64];
    break;
  }

  return error;
}

Status NativeRegisterContextNetBSD_x86_64::WriteRegister(
    const RegisterInfo *reg_info, const RegisterValue &reg_value) {

  Status error;

  if (!reg_info) {
    error.SetErrorString("reg_info NULL");
    return error;
  }

  uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
  if (reg == LLDB_INVALID_REGNUM) {
    // This is likely an internal register for lldb use only and should not be
    // directly queried.
    error.SetErrorStringWithFormat("register \"%s\" is an internal-only lldb "
                                   "register, cannot read directly",
                                   reg_info->name);
    return error;
  }

  int set = GetSetForNativeRegNum(reg);
  if (set == -1) {
    // This is likely an internal register for lldb use only and should not be
    // directly queried.
    error.SetErrorStringWithFormat("register \"%s\" is in unrecognized set",
                                   reg_info->name);
    return error;
  }

  switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
  case llvm::Triple::x86_64:
    break;
  case llvm::Triple::x86:
    reg = RegNumX86ToX86_64(reg);
    break;
  default:
    assert(false && "Unhandled target architecture.");
    error.SetErrorString("Unhandled target architecture.");
    return error;
  }

  error = ReadRegisterSet(set);
  if (error.Fail())
    return error;

  switch (reg) {
#if defined(__x86_64__)
  case lldb_rax_x86_64:
    m_gpr.regs[_REG_RAX] = reg_value.GetAsUInt64();
    break;
  case lldb_rbx_x86_64:
    m_gpr.regs[_REG_RBX] = reg_value.GetAsUInt64();
    break;
  case lldb_rcx_x86_64:
    m_gpr.regs[_REG_RCX] = reg_value.GetAsUInt64();
    break;
  case lldb_rdx_x86_64:
    m_gpr.regs[_REG_RDX] = reg_value.GetAsUInt64();
    break;
  case lldb_rdi_x86_64:
    m_gpr.regs[_REG_RDI] = reg_value.GetAsUInt64();
    break;
  case lldb_rsi_x86_64:
    m_gpr.regs[_REG_RSI] = reg_value.GetAsUInt64();
    break;
  case lldb_rbp_x86_64:
    m_gpr.regs[_REG_RBP] = reg_value.GetAsUInt64();
    break;
  case lldb_rsp_x86_64:
    m_gpr.regs[_REG_RSP] = reg_value.GetAsUInt64();
    break;
  case lldb_r8_x86_64:
    m_gpr.regs[_REG_R8] = reg_value.GetAsUInt64();
    break;
  case lldb_r9_x86_64:
    m_gpr.regs[_REG_R9] = reg_value.GetAsUInt64();
    break;
  case lldb_r10_x86_64:
    m_gpr.regs[_REG_R10] = reg_value.GetAsUInt64();
    break;
  case lldb_r11_x86_64:
    m_gpr.regs[_REG_R11] = reg_value.GetAsUInt64();
    break;
  case lldb_r12_x86_64:
    m_gpr.regs[_REG_R12] = reg_value.GetAsUInt64();
    break;
  case lldb_r13_x86_64:
    m_gpr.regs[_REG_R13] = reg_value.GetAsUInt64();
    break;
  case lldb_r14_x86_64:
    m_gpr.regs[_REG_R14] = reg_value.GetAsUInt64();
    break;
  case lldb_r15_x86_64:
    m_gpr.regs[_REG_R15] = reg_value.GetAsUInt64();
    break;
  case lldb_rip_x86_64:
    m_gpr.regs[_REG_RIP] = reg_value.GetAsUInt64();
    break;
  case lldb_rflags_x86_64:
    m_gpr.regs[_REG_RFLAGS] = reg_value.GetAsUInt64();
    break;
  case lldb_cs_x86_64:
    m_gpr.regs[_REG_CS] = reg_value.GetAsUInt64();
    break;
  case lldb_fs_x86_64:
    m_gpr.regs[_REG_FS] = reg_value.GetAsUInt64();
    break;
  case lldb_gs_x86_64:
    m_gpr.regs[_REG_GS] = reg_value.GetAsUInt64();
    break;
  case lldb_ss_x86_64:
    m_gpr.regs[_REG_SS] = reg_value.GetAsUInt64();
    break;
  case lldb_ds_x86_64:
    m_gpr.regs[_REG_DS] = reg_value.GetAsUInt64();
    break;
  case lldb_es_x86_64:
    m_gpr.regs[_REG_ES] = reg_value.GetAsUInt64();
    break;
#else
  case lldb_rax_x86_64:
    m_gpr.r_eax = reg_value.GetAsUInt32();
    break;
  case lldb_rbx_x86_64:
    m_gpr.r_ebx = reg_value.GetAsUInt32();
    break;
  case lldb_rcx_x86_64:
    m_gpr.r_ecx = reg_value.GetAsUInt32();
    break;
  case lldb_rdx_x86_64:
    m_gpr.r_edx = reg_value.GetAsUInt32();
    break;
  case lldb_rdi_x86_64:
    m_gpr.r_edi = reg_value.GetAsUInt32();
    break;
  case lldb_rsi_x86_64:
    m_gpr.r_esi = reg_value.GetAsUInt32();
    break;
  case lldb_rsp_x86_64:
    m_gpr.r_esp = reg_value.GetAsUInt32();
    break;
  case lldb_rbp_x86_64:
    m_gpr.r_ebp = reg_value.GetAsUInt32();
    break;
  case lldb_rip_x86_64:
    m_gpr.r_eip = reg_value.GetAsUInt32();
    break;
  case lldb_rflags_x86_64:
    m_gpr.r_eflags = reg_value.GetAsUInt32();
    break;
  case lldb_cs_x86_64:
    m_gpr.r_cs = reg_value.GetAsUInt32();
    break;
  case lldb_fs_x86_64:
    m_gpr.r_fs = reg_value.GetAsUInt32();
    break;
  case lldb_gs_x86_64:
    m_gpr.r_gs = reg_value.GetAsUInt32();
    break;
  case lldb_ss_x86_64:
    m_gpr.r_ss = reg_value.GetAsUInt32();
    break;
  case lldb_ds_x86_64:
    m_gpr.r_ds = reg_value.GetAsUInt32();
    break;
  case lldb_es_x86_64:
    m_gpr.r_es = reg_value.GetAsUInt32();
    break;
#endif
  case lldb_fctrl_x86_64:
    m_fpr.fxstate.fx_cw = reg_value.GetAsUInt16();
    break;
  case lldb_fstat_x86_64:
    m_fpr.fxstate.fx_sw = reg_value.GetAsUInt16();
    break;
  case lldb_ftag_x86_64:
    m_fpr.fxstate.fx_tw = reg_value.GetAsUInt16();
    break;
  case lldb_fop_x86_64:
    m_fpr.fxstate.fx_opcode = reg_value.GetAsUInt16();
    break;
  case lldb_fiseg_x86_64:
    m_fpr.fxstate.fx_ip.fa_32.fa_seg = reg_value.GetAsUInt32();
    break;
  case lldb_fioff_x86_64:
    m_fpr.fxstate.fx_ip.fa_32.fa_off = reg_value.GetAsUInt32();
    break;
  case lldb_foseg_x86_64:
    m_fpr.fxstate.fx_dp.fa_32.fa_seg = reg_value.GetAsUInt32();
    break;
  case lldb_fooff_x86_64:
    m_fpr.fxstate.fx_dp.fa_32.fa_off = reg_value.GetAsUInt32();
    break;
  case lldb_mxcsr_x86_64:
    m_fpr.fxstate.fx_mxcsr = reg_value.GetAsUInt32();
    break;
  case lldb_mxcsrmask_x86_64:
    m_fpr.fxstate.fx_mxcsr_mask = reg_value.GetAsUInt32();
    break;
  case lldb_st0_x86_64:
  case lldb_st1_x86_64:
  case lldb_st2_x86_64:
  case lldb_st3_x86_64:
  case lldb_st4_x86_64:
  case lldb_st5_x86_64:
  case lldb_st6_x86_64:
  case lldb_st7_x86_64:
    ::memcpy(&m_fpr.fxstate.fx_87_ac[reg - lldb_st0_x86_64],
             reg_value.GetBytes(), reg_value.GetByteSize());
    break;
  case lldb_mm0_x86_64:
  case lldb_mm1_x86_64:
  case lldb_mm2_x86_64:
  case lldb_mm3_x86_64:
  case lldb_mm4_x86_64:
  case lldb_mm5_x86_64:
  case lldb_mm6_x86_64:
  case lldb_mm7_x86_64:
    ::memcpy(&m_fpr.fxstate.fx_87_ac[reg - lldb_mm0_x86_64],
             reg_value.GetBytes(), reg_value.GetByteSize());
    break;
  case lldb_xmm0_x86_64:
  case lldb_xmm1_x86_64:
  case lldb_xmm2_x86_64:
  case lldb_xmm3_x86_64:
  case lldb_xmm4_x86_64:
  case lldb_xmm5_x86_64:
  case lldb_xmm6_x86_64:
  case lldb_xmm7_x86_64:
  case lldb_xmm8_x86_64:
  case lldb_xmm9_x86_64:
  case lldb_xmm10_x86_64:
  case lldb_xmm11_x86_64:
  case lldb_xmm12_x86_64:
  case lldb_xmm13_x86_64:
  case lldb_xmm14_x86_64:
  case lldb_xmm15_x86_64:
    ::memcpy(&m_fpr.fxstate.fx_xmm[reg - lldb_xmm0_x86_64],
             reg_value.GetBytes(), reg_value.GetByteSize());
    break;
  case lldb_ymm0_x86_64:
  case lldb_ymm1_x86_64:
  case lldb_ymm2_x86_64:
  case lldb_ymm3_x86_64:
  case lldb_ymm4_x86_64:
  case lldb_ymm5_x86_64:
  case lldb_ymm6_x86_64:
  case lldb_ymm7_x86_64:
  case lldb_ymm8_x86_64:
  case lldb_ymm9_x86_64:
  case lldb_ymm10_x86_64:
  case lldb_ymm11_x86_64:
  case lldb_ymm12_x86_64:
  case lldb_ymm13_x86_64:
  case lldb_ymm14_x86_64:
  case lldb_ymm15_x86_64:
#ifdef HAVE_XSTATE
    if (!(m_xstate.xs_rfbm & XCR0_SSE) ||
        !(m_xstate.xs_rfbm & XCR0_YMM_Hi128)) {
      error.SetErrorStringWithFormat("register \"%s\" not supported by CPU/kernel",
                                     reg_info->name);
    } else {
      uint32_t reg_index = reg - lldb_ymm0_x86_64;
      YMMReg ymm;
      ::memcpy(ymm.bytes, reg_value.GetBytes(), reg_value.GetByteSize());
      YMMToXState(ymm,
          m_xstate.xs_fxsave.fx_xmm[reg_index].xmm_bytes,
          m_xstate.xs_ymm_hi128.xs_ymm[reg_index].ymm_bytes);
    }
#else
    error.SetErrorString("XState not supported by the kernel");
#endif
    break;
  case lldb_dr0_x86_64:
  case lldb_dr1_x86_64:
  case lldb_dr2_x86_64:
  case lldb_dr3_x86_64:
  case lldb_dr4_x86_64:
  case lldb_dr5_x86_64:
  case lldb_dr6_x86_64:
  case lldb_dr7_x86_64:
    m_dbr.dr[reg - lldb_dr0_x86_64] = reg_value.GetAsUInt64();
    break;
  }

  return WriteRegisterSet(set);
}

Status NativeRegisterContextNetBSD_x86_64::ReadAllRegisterValues(
    lldb::DataBufferSP &data_sp) {
  Status error;

  data_sp.reset(new DataBufferHeap(REG_CONTEXT_SIZE, 0));
  error = ReadRegisterSet(GPRegSet);
  if (error.Fail())
    return error;

  uint8_t *dst = data_sp->GetBytes();
  ::memcpy(dst, &m_gpr, GetRegisterInfoInterface().GetGPRSize());
  dst += GetRegisterInfoInterface().GetGPRSize();

  return error;
}

Status NativeRegisterContextNetBSD_x86_64::WriteAllRegisterValues(
    const lldb::DataBufferSP &data_sp) {
  Status error;

  if (!data_sp) {
    error.SetErrorStringWithFormat(
        "NativeRegisterContextNetBSD_x86_64::%s invalid data_sp provided",
        __FUNCTION__);
    return error;
  }

  if (data_sp->GetByteSize() != REG_CONTEXT_SIZE) {
    error.SetErrorStringWithFormat(
        "NativeRegisterContextNetBSD_x86_64::%s data_sp contained mismatched "
        "data size, expected %zu, actual %" PRIu64,
        __FUNCTION__, REG_CONTEXT_SIZE, data_sp->GetByteSize());
    return error;
  }

  uint8_t *src = data_sp->GetBytes();
  if (src == nullptr) {
    error.SetErrorStringWithFormat("NativeRegisterContextNetBSD_x86_64::%s "
                                   "DataBuffer::GetBytes() returned a null "
                                   "pointer",
                                   __FUNCTION__);
    return error;
  }
  ::memcpy(&m_gpr, src, GetRegisterInfoInterface().GetGPRSize());

  error = WriteRegisterSet(GPRegSet);
  if (error.Fail())
    return error;
  src += GetRegisterInfoInterface().GetGPRSize();

  return error;
}

int NativeRegisterContextNetBSD_x86_64::GetDR(int num) const {
  assert(num >= 0 && num <= 7);
  switch (GetRegisterInfoInterface().GetTargetArchitecture().GetMachine()) {
  case llvm::Triple::x86:
    return lldb_dr0_i386 + num;
  case llvm::Triple::x86_64:
    return lldb_dr0_x86_64 + num;
  default:
    return -1;
  }
}

Status NativeRegisterContextNetBSD_x86_64::IsWatchpointHit(uint32_t wp_index,
                                                           bool &is_hit) {
  if (wp_index >= NumSupportedHardwareWatchpoints())
    return Status("Watchpoint index out of range");

  RegisterValue reg_value;
  const RegisterInfo *const reg_info = GetRegisterInfoAtIndex(GetDR(6));
  Status error = ReadRegister(reg_info, reg_value);
  if (error.Fail()) {
    is_hit = false;
    return error;
  }

  uint64_t status_bits = reg_value.GetAsUInt64();

  is_hit = status_bits & (1 << wp_index);

  return error;
}

Status NativeRegisterContextNetBSD_x86_64::GetWatchpointHitIndex(
    uint32_t &wp_index, lldb::addr_t trap_addr) {
  uint32_t num_hw_wps = NumSupportedHardwareWatchpoints();
  for (wp_index = 0; wp_index < num_hw_wps; ++wp_index) {
    bool is_hit;
    Status error = IsWatchpointHit(wp_index, is_hit);
    if (error.Fail()) {
      wp_index = LLDB_INVALID_INDEX32;
      return error;
    } else if (is_hit) {
      return error;
    }
  }
  wp_index = LLDB_INVALID_INDEX32;
  return Status();
}

Status NativeRegisterContextNetBSD_x86_64::IsWatchpointVacant(uint32_t wp_index,
                                                              bool &is_vacant) {
  if (wp_index >= NumSupportedHardwareWatchpoints())
    return Status("Watchpoint index out of range");

  RegisterValue reg_value;
  const RegisterInfo *const reg_info = GetRegisterInfoAtIndex(GetDR(7));
  Status error = ReadRegister(reg_info, reg_value);
  if (error.Fail()) {
    is_vacant = false;
    return error;
  }

  uint64_t control_bits = reg_value.GetAsUInt64();

  is_vacant = !(control_bits & (1 << (2 * wp_index + 1)));

  return error;
}

Status NativeRegisterContextNetBSD_x86_64::SetHardwareWatchpointWithIndex(
    lldb::addr_t addr, size_t size, uint32_t watch_flags, uint32_t wp_index) {

  if (wp_index >= NumSupportedHardwareWatchpoints())
    return Status("Watchpoint index out of range");

  // Read only watchpoints aren't supported on x86_64. Fall back to read/write
  // waitchpoints instead.
  // TODO: Add logic to detect when a write happens and ignore that watchpoint
  // hit.
  if (watch_flags == 0x2)
    watch_flags = 0x3;

  if (watch_flags != 0x1 && watch_flags != 0x3)
    return Status("Invalid read/write bits for watchpoint");

  if (size != 1 && size != 2 && size != 4 && size != 8)
    return Status("Invalid size for watchpoint");

  bool is_vacant;
  Status error = IsWatchpointVacant(wp_index, is_vacant);
  if (error.Fail())
    return error;
  if (!is_vacant)
    return Status("Watchpoint index not vacant");

  const RegisterInfo *const reg_info_dr7 = GetRegisterInfoAtIndex(GetDR(7));
  RegisterValue dr7_value;
  error = ReadRegister(reg_info_dr7, dr7_value);
  if (error.Fail())
    return error;

  // for watchpoints 0, 1, 2, or 3, respectively, set bits 1, 3, 5, or 7
  uint64_t enable_bit = 1 << (2 * wp_index + 1);

  // set bits 16-17, 20-21, 24-25, or 28-29
  // with 0b01 for write, and 0b11 for read/write
  uint64_t rw_bits = watch_flags << (16 + 4 * wp_index);

  // set bits 18-19, 22-23, 26-27, or 30-31
  // with 0b00, 0b01, 0b10, or 0b11
  // for 1, 2, 8 (if supported), or 4 bytes, respectively
  uint64_t size_bits = (size == 8 ? 0x2 : size - 1) << (18 + 4 * wp_index);

  uint64_t bit_mask = (0x3 << (2 * wp_index)) | (0xF << (16 + 4 * wp_index));

  uint64_t control_bits = dr7_value.GetAsUInt64() & ~bit_mask;

  control_bits |= enable_bit | rw_bits | size_bits;

  const RegisterInfo *const reg_info_drN =
      GetRegisterInfoAtIndex(GetDR(wp_index));
  RegisterValue drN_value;
  error = ReadRegister(reg_info_drN, drN_value);
  if (error.Fail())
    return error;

  // clear dr6 if address or bits changed (i.e. we're not reenabling the same
  // watchpoint)
  if (drN_value.GetAsUInt64() != addr ||
      (dr7_value.GetAsUInt64() & bit_mask) != (rw_bits | size_bits)) {
    ClearWatchpointHit(wp_index);

    error = WriteRegister(reg_info_drN, RegisterValue(addr));
    if (error.Fail())
      return error;
  }

  error = WriteRegister(reg_info_dr7, RegisterValue(control_bits));
  if (error.Fail())
    return error;

  error.Clear();
  return error;
}

bool NativeRegisterContextNetBSD_x86_64::ClearHardwareWatchpoint(
    uint32_t wp_index) {
  if (wp_index >= NumSupportedHardwareWatchpoints())
    return false;

  // for watchpoints 0, 1, 2, or 3, respectively, clear bits 0-1, 2-3, 4-5
  // or 6-7 of the debug control register (DR7)
  const RegisterInfo *const reg_info_dr7 = GetRegisterInfoAtIndex(GetDR(7));
  RegisterValue reg_value;
  Status error = ReadRegister(reg_info_dr7, reg_value);
  if (error.Fail())
    return false;
  uint64_t bit_mask = 0x3 << (2 * wp_index);
  uint64_t control_bits = reg_value.GetAsUInt64() & ~bit_mask;

  return WriteRegister(reg_info_dr7, RegisterValue(control_bits)).Success();
}

Status NativeRegisterContextNetBSD_x86_64::ClearWatchpointHit(uint32_t wp_index) {
  if (wp_index >= NumSupportedHardwareWatchpoints())
    return Status("Watchpoint index out of range");

  // for watchpoints 0, 1, 2, or 3, respectively, check bits 0, 1, 2, or 3 of
  // the debug status register (DR6)
  const RegisterInfo *const reg_info_dr6 = GetRegisterInfoAtIndex(GetDR(6));
  RegisterValue reg_value;
  Status error = ReadRegister(reg_info_dr6, reg_value);
  if (error.Fail())
    return error;

  uint64_t bit_mask = 1 << wp_index;
  uint64_t status_bits = reg_value.GetAsUInt64() & ~bit_mask;
  return WriteRegister(reg_info_dr6, RegisterValue(status_bits));
}

Status NativeRegisterContextNetBSD_x86_64::ClearAllHardwareWatchpoints() {
  RegisterValue reg_value;

  // clear bits {0-4} of the debug status register (DR6)
  const RegisterInfo *const reg_info_dr6 = GetRegisterInfoAtIndex(GetDR(6));
  Status error = ReadRegister(reg_info_dr6, reg_value);
  if (error.Fail())
    return error;
  uint64_t bit_mask = 0xF;
  uint64_t status_bits = reg_value.GetAsUInt64() & ~bit_mask;
  error = WriteRegister(reg_info_dr6, RegisterValue(status_bits));
  if (error.Fail())
    return error;

  // clear bits {0-7,16-31} of the debug control register (DR7)
  const RegisterInfo *const reg_info_dr7 = GetRegisterInfoAtIndex(GetDR(7));
  error = ReadRegister(reg_info_dr7, reg_value);
  if (error.Fail())
    return error;
  bit_mask = 0xFF | (0xFFFF << 16);
  uint64_t control_bits = reg_value.GetAsUInt64() & ~bit_mask;
  return WriteRegister(reg_info_dr7, RegisterValue(control_bits));
}

uint32_t NativeRegisterContextNetBSD_x86_64::SetHardwareWatchpoint(
    lldb::addr_t addr, size_t size, uint32_t watch_flags) {
  Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_WATCHPOINTS));
  const uint32_t num_hw_watchpoints = NumSupportedHardwareWatchpoints();
  for (uint32_t wp_index = 0; wp_index < num_hw_watchpoints; ++wp_index) {
    bool is_vacant;
    Status error = IsWatchpointVacant(wp_index, is_vacant);
    if (is_vacant) {
      error = SetHardwareWatchpointWithIndex(addr, size, watch_flags, wp_index);
      if (error.Success())
        return wp_index;
    }
    if (error.Fail() && log) {
      LLDB_LOGF(log, "NativeRegisterContextNetBSD_x86_64::%s Error: %s",
                __FUNCTION__, error.AsCString());
    }
  }
  return LLDB_INVALID_INDEX32;
}

lldb::addr_t
NativeRegisterContextNetBSD_x86_64::GetWatchpointAddress(uint32_t wp_index) {
  if (wp_index >= NumSupportedHardwareWatchpoints())
    return LLDB_INVALID_ADDRESS;
  RegisterValue reg_value;
  const RegisterInfo *const reg_info_drN =
      GetRegisterInfoAtIndex(GetDR(wp_index));
  if (ReadRegister(reg_info_drN, reg_value).Fail())
    return LLDB_INVALID_ADDRESS;
  return reg_value.GetAsUInt64();
}

uint32_t NativeRegisterContextNetBSD_x86_64::NumSupportedHardwareWatchpoints() {
  // Available debug address registers: dr0, dr1, dr2, dr3
  return 4;
}

Status NativeRegisterContextNetBSD_x86_64::CopyHardwareWatchpointsFrom(
    NativeRegisterContextNetBSD &source) {
  auto &r_source = static_cast<NativeRegisterContextNetBSD_x86_64&>(source);
  Status res = r_source.ReadRegisterSet(DBRegSet);
  if (!res.Fail()) {
    // copy dbregs only if any watchpoints were set
    if ((r_source.m_dbr.dr[7] & 0xFF) == 0)
      return res;

    m_dbr = r_source.m_dbr;
    res = WriteRegisterSet(DBRegSet);
  }
  return res;
}

#endif // defined(__x86_64__)