NativeRegisterContextWindows_arm64.cpp

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//===-- NativeRegisterContextWindows_arm64.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(__aarch64__) || defined(_M_ARM64)
 
#include "NativeRegisterContextWindows_arm64.h"
#include "NativeThreadWindows.h"
#include "ProcessWindowsLog.h"
#include "lldb/Host/HostInfo.h"
#include "lldb/Host/HostThread.h"
#include "lldb/Host/windows/HostThreadWindows.h"
 
#include "lldb/Utility/Log.h"
#include "lldb/Utility/RegisterValue.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/ScopeExit.h"
 
using namespace lldb;
using namespace lldb_private;
 
#define REG_CONTEXT_SIZE sizeof(::CONTEXT)
 
namespace {
static const uint32_t g_gpr_regnums_arm64[] = {
    gpr_x0_arm64,       gpr_x1_arm64,   gpr_x2_arm64,  gpr_x3_arm64,
    gpr_x4_arm64,       gpr_x5_arm64,   gpr_x6_arm64,  gpr_x7_arm64,
    gpr_x8_arm64,       gpr_x9_arm64,   gpr_x10_arm64, gpr_x11_arm64,
    gpr_x12_arm64,      gpr_x13_arm64,  gpr_x14_arm64, gpr_x15_arm64,
    gpr_x16_arm64,      gpr_x17_arm64,  gpr_x18_arm64, gpr_x19_arm64,
    gpr_x20_arm64,      gpr_x21_arm64,  gpr_x22_arm64, gpr_x23_arm64,
    gpr_x24_arm64,      gpr_x25_arm64,  gpr_x26_arm64, gpr_x27_arm64,
    gpr_x28_arm64,      gpr_fp_arm64,   gpr_lr_arm64,  gpr_sp_arm64,
    gpr_pc_arm64,       gpr_cpsr_arm64, gpr_w0_arm64,  gpr_w1_arm64,
    gpr_w2_arm64,       gpr_w3_arm64,   gpr_w4_arm64,  gpr_w5_arm64,
    gpr_w6_arm64,       gpr_w7_arm64,   gpr_w8_arm64,  gpr_w9_arm64,
    gpr_w10_arm64,      gpr_w11_arm64,  gpr_w12_arm64, gpr_w13_arm64,
    gpr_w14_arm64,      gpr_w15_arm64,  gpr_w16_arm64, gpr_w17_arm64,
    gpr_w18_arm64,      gpr_w19_arm64,  gpr_w20_arm64, gpr_w21_arm64,
    gpr_w22_arm64,      gpr_w23_arm64,  gpr_w24_arm64, gpr_w25_arm64,
    gpr_w26_arm64,      gpr_w27_arm64,  gpr_w28_arm64,
    LLDB_INVALID_REGNUM // Register set must be terminated with this flag
};
static_assert(((sizeof g_gpr_regnums_arm64 / sizeof g_gpr_regnums_arm64[0]) -
               1) == k_num_gpr_registers_arm64,
              "g_gpr_regnums_arm64 has wrong number of register infos");
 
static const uint32_t g_fpr_regnums_arm64[] = {
    fpu_v0_arm64,       fpu_v1_arm64,   fpu_v2_arm64,  fpu_v3_arm64,
    fpu_v4_arm64,       fpu_v5_arm64,   fpu_v6_arm64,  fpu_v7_arm64,
    fpu_v8_arm64,       fpu_v9_arm64,   fpu_v10_arm64, fpu_v11_arm64,
    fpu_v12_arm64,      fpu_v13_arm64,  fpu_v14_arm64, fpu_v15_arm64,
    fpu_v16_arm64,      fpu_v17_arm64,  fpu_v18_arm64, fpu_v19_arm64,
    fpu_v20_arm64,      fpu_v21_arm64,  fpu_v22_arm64, fpu_v23_arm64,
    fpu_v24_arm64,      fpu_v25_arm64,  fpu_v26_arm64, fpu_v27_arm64,
    fpu_v28_arm64,      fpu_v29_arm64,  fpu_v30_arm64, fpu_v31_arm64,
    fpu_s0_arm64,       fpu_s1_arm64,   fpu_s2_arm64,  fpu_s3_arm64,
    fpu_s4_arm64,       fpu_s5_arm64,   fpu_s6_arm64,  fpu_s7_arm64,
    fpu_s8_arm64,       fpu_s9_arm64,   fpu_s10_arm64, fpu_s11_arm64,
    fpu_s12_arm64,      fpu_s13_arm64,  fpu_s14_arm64, fpu_s15_arm64,
    fpu_s16_arm64,      fpu_s17_arm64,  fpu_s18_arm64, fpu_s19_arm64,
    fpu_s20_arm64,      fpu_s21_arm64,  fpu_s22_arm64, fpu_s23_arm64,
    fpu_s24_arm64,      fpu_s25_arm64,  fpu_s26_arm64, fpu_s27_arm64,
    fpu_s28_arm64,      fpu_s29_arm64,  fpu_s30_arm64, fpu_s31_arm64,
 
    fpu_d0_arm64,       fpu_d1_arm64,   fpu_d2_arm64,  fpu_d3_arm64,
    fpu_d4_arm64,       fpu_d5_arm64,   fpu_d6_arm64,  fpu_d7_arm64,
    fpu_d8_arm64,       fpu_d9_arm64,   fpu_d10_arm64, fpu_d11_arm64,
    fpu_d12_arm64,      fpu_d13_arm64,  fpu_d14_arm64, fpu_d15_arm64,
    fpu_d16_arm64,      fpu_d17_arm64,  fpu_d18_arm64, fpu_d19_arm64,
    fpu_d20_arm64,      fpu_d21_arm64,  fpu_d22_arm64, fpu_d23_arm64,
    fpu_d24_arm64,      fpu_d25_arm64,  fpu_d26_arm64, fpu_d27_arm64,
    fpu_d28_arm64,      fpu_d29_arm64,  fpu_d30_arm64, fpu_d31_arm64,
    fpu_fpsr_arm64,     fpu_fpcr_arm64,
    LLDB_INVALID_REGNUM // Register set must be terminated with this flag
};
static_assert(((sizeof g_fpr_regnums_arm64 / sizeof g_fpr_regnums_arm64[0]) -
               1) == k_num_fpr_registers_arm64,
              "g_fpu_regnums_arm64 has wrong number of register infos");
 
static const RegisterSet g_reg_sets_arm64[] = {
    {"General Purpose Registers", "gpr", std::size(g_gpr_regnums_arm64) - 1,
     g_gpr_regnums_arm64},
    {"Floating Point Registers", "fpr", std::size(g_fpr_regnums_arm64) - 1,
     g_fpr_regnums_arm64},
};
 
enum { k_num_register_sets = 2 };
 
} // namespace
 
static RegisterInfoInterface *
CreateRegisterInfoInterface(const ArchSpec &target_arch) {
  assert((HostInfo::GetArchitecture().GetAddressByteSize() == 8) &&
         "Register setting path assumes this is a 64-bit host");
  return new RegisterInfoPOSIX_arm64(
      target_arch, RegisterInfoPOSIX_arm64::eRegsetMaskDefault);
}
 
static Status GetThreadContextLength(DWORD context_flags,
                                     DWORD &context_length) {
  Log *log = GetLog(WindowsLog::Registers);
  Status error;
 
  if (InitializeContext(nullptr, context_flags, nullptr, &context_length)) {
    error = Status::FromErrorString("InitializeContext succeeded unexpectedly");
    LLDB_LOG(log, "{0}", error);
    return error;
  }
 
  if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
    error = Status(GetLastError(), eErrorTypeWin32);
    LLDB_LOG(log,
             "InitializeContext failed with unexpected error {0}, expected "
             "ERROR_INSUFFICIENT_BUFFER",
             error);
    return error;
  }
 
  return error;
}
 
static Status GetThreadContextHelper(lldb::thread_t thread_handle,
                                     DWORD context_flags, PCONTEXT &context,
                                     DataBufferHeap *context_buffer) {
  Log *log = GetLog(WindowsLog::Registers);
  Status error;
  DWORD context_length = 0;
 
  if (!context_buffer) {
    error = Status::FromErrorString("context buffer not allocated");
    LLDB_LOG(log, "{0}", error);
    return error;
  }
 
  error = GetThreadContextLength(context_flags, context_length);
  if (error.Fail())
    return error;
 
  if (context_buffer->SetByteSize(context_length) != context_length) {
    error = Status::FromErrorString("failed to resize context buffer");
    LLDB_LOG(log, "{0}", error);
    return error;
  }
 
  if (!InitializeContext(context_buffer->GetBytes(), context_flags, &context,
                         &context_length)) {
    error = Status(GetLastError(), eErrorTypeWin32);
    LLDB_LOG(log, "InitializeContext failed with error {0}", error);
    return error;
  }
 
  if (!::GetThreadContext(thread_handle, context)) {
    error = Status(GetLastError(), eErrorTypeWin32);
    LLDB_LOG(log, "GetThreadContext failed with error {0}", error);
    return error;
  }
 
  return Status();
}
 
static Status SetThreadContextHelper(lldb::thread_t thread_handle,
                                     PCONTEXT context) {
  Log *log = GetLog(WindowsLog::Registers);
  Status error;
  if (!::SetThreadContext(thread_handle, context)) {
    error = Status(GetLastError(), eErrorTypeWin32);
    LLDB_LOG(log, "SetThreadContext failed with error {0}", error);
    return error;
  }
  return error;
}
 
std::unique_ptr<NativeRegisterContextWindows>
NativeRegisterContextWindows::CreateHostNativeRegisterContextWindows(
    const ArchSpec &target_arch, NativeThreadProtocol &native_thread) {
  // Register context for a native 64-bit application.
  return std::make_unique<NativeRegisterContextWindows_arm64>(target_arch,
                                                              native_thread);
}
 
NativeRegisterContextWindows_arm64::NativeRegisterContextWindows_arm64(
    const ArchSpec &target_arch, NativeThreadProtocol &native_thread)
    : NativeRegisterContextRegisterInfo(
          native_thread, CreateRegisterInfoInterface(target_arch)),
      m_context(nullptr), m_context_buffer(nullptr) {
  // Currently, there is no API to query the maximum supported hardware
  // breakpoints and watchpoints on Windows. The values set below are based
  // on tests conducted on Windows 11 with Snapdragon Elite X hardware.
  m_max_hwp_supported = 1;
}
 
bool NativeRegisterContextWindows_arm64::IsGPR(uint32_t reg_index) const {
  return (reg_index >= k_first_gpr_arm64 && reg_index <= k_last_gpr_arm64);
}
 
bool NativeRegisterContextWindows_arm64::IsFPR(uint32_t reg_index) const {
  return (reg_index >= k_first_fpr_arm64 && reg_index <= k_last_fpr_arm64);
}
 
uint32_t NativeRegisterContextWindows_arm64::GetRegisterSetCount() const {
  return k_num_register_sets;
}
 
const RegisterSet *
NativeRegisterContextWindows_arm64::GetRegisterSet(uint32_t set_index) const {
  if (set_index >= k_num_register_sets)
    return nullptr;
  return &g_reg_sets_arm64[set_index];
}
 
Status NativeRegisterContextWindows_arm64::GPRRead(const uint32_t reg,
                                                   RegisterValue &reg_value) {
  Status error = CacheAllRegisterValues();
  if (error.Fail())
    return error;
 
  switch (reg) {
  case gpr_x0_arm64:
  case gpr_x1_arm64:
  case gpr_x2_arm64:
  case gpr_x3_arm64:
  case gpr_x4_arm64:
  case gpr_x5_arm64:
  case gpr_x6_arm64:
  case gpr_x7_arm64:
  case gpr_x8_arm64:
  case gpr_x9_arm64:
  case gpr_x10_arm64:
  case gpr_x11_arm64:
  case gpr_x12_arm64:
  case gpr_x13_arm64:
  case gpr_x14_arm64:
  case gpr_x15_arm64:
  case gpr_x16_arm64:
  case gpr_x17_arm64:
  case gpr_x18_arm64:
  case gpr_x19_arm64:
  case gpr_x20_arm64:
  case gpr_x21_arm64:
  case gpr_x22_arm64:
  case gpr_x23_arm64:
  case gpr_x24_arm64:
  case gpr_x25_arm64:
  case gpr_x26_arm64:
  case gpr_x27_arm64:
  case gpr_x28_arm64:
    reg_value.SetUInt64(m_context->X[reg - gpr_x0_arm64]);
    break;
 
  case gpr_fp_arm64:
    reg_value.SetUInt64(m_context->Fp);
    break;
  case gpr_sp_arm64:
    reg_value.SetUInt64(m_context->Sp);
    break;
  case gpr_lr_arm64:
    reg_value.SetUInt64(m_context->Lr);
    break;
  case gpr_pc_arm64:
    reg_value.SetUInt64(m_context->Pc);
    break;
  case gpr_cpsr_arm64:
    reg_value.SetUInt32(m_context->Cpsr);
    break;
 
  case gpr_w0_arm64:
  case gpr_w1_arm64:
  case gpr_w2_arm64:
  case gpr_w3_arm64:
  case gpr_w4_arm64:
  case gpr_w5_arm64:
  case gpr_w6_arm64:
  case gpr_w7_arm64:
  case gpr_w8_arm64:
  case gpr_w9_arm64:
  case gpr_w10_arm64:
  case gpr_w11_arm64:
  case gpr_w12_arm64:
  case gpr_w13_arm64:
  case gpr_w14_arm64:
  case gpr_w15_arm64:
  case gpr_w16_arm64:
  case gpr_w17_arm64:
  case gpr_w18_arm64:
  case gpr_w19_arm64:
  case gpr_w20_arm64:
  case gpr_w21_arm64:
  case gpr_w22_arm64:
  case gpr_w23_arm64:
  case gpr_w24_arm64:
  case gpr_w25_arm64:
  case gpr_w26_arm64:
  case gpr_w27_arm64:
  case gpr_w28_arm64:
    reg_value.SetUInt32(
        static_cast<uint32_t>(m_context->X[reg - gpr_w0_arm64] & 0xffffffff));
    break;
  }
 
  return error;
}
 
Status
NativeRegisterContextWindows_arm64::GPRWrite(const uint32_t reg,
                                             const RegisterValue &reg_value) {
  auto cleanup = llvm::make_scope_exit([&]() { m_context = nullptr; });
 
  PCONTEXT context = nullptr;
  DataBufferHeap context_buffer;
  DWORD context_flags = CONTEXT_CONTROL | CONTEXT_INTEGER;
  auto thread_handle = GetThreadHandle();
 
  Status error = GetThreadContextHelper(thread_handle, context_flags, context,
                                        &context_buffer);
  if (error.Fail())
    return error;
 
  switch (reg) {
  case gpr_x0_arm64:
  case gpr_x1_arm64:
  case gpr_x2_arm64:
  case gpr_x3_arm64:
  case gpr_x4_arm64:
  case gpr_x5_arm64:
  case gpr_x6_arm64:
  case gpr_x7_arm64:
  case gpr_x8_arm64:
  case gpr_x9_arm64:
  case gpr_x10_arm64:
  case gpr_x11_arm64:
  case gpr_x12_arm64:
  case gpr_x13_arm64:
  case gpr_x14_arm64:
  case gpr_x15_arm64:
  case gpr_x16_arm64:
  case gpr_x17_arm64:
  case gpr_x18_arm64:
  case gpr_x19_arm64:
  case gpr_x20_arm64:
  case gpr_x21_arm64:
  case gpr_x22_arm64:
  case gpr_x23_arm64:
  case gpr_x24_arm64:
  case gpr_x25_arm64:
  case gpr_x26_arm64:
  case gpr_x27_arm64:
  case gpr_x28_arm64:
    context->X[reg - gpr_x0_arm64] = reg_value.GetAsUInt64();
    break;
 
  case gpr_fp_arm64:
    context->Fp = reg_value.GetAsUInt64();
    break;
  case gpr_sp_arm64:
    context->Sp = reg_value.GetAsUInt64();
    break;
  case gpr_lr_arm64:
    context->Lr = reg_value.GetAsUInt64();
    break;
  case gpr_pc_arm64:
    context->Pc = reg_value.GetAsUInt64();
    break;
  case gpr_cpsr_arm64:
    context->Cpsr = reg_value.GetAsUInt32();
    break;
 
  case gpr_w0_arm64:
  case gpr_w1_arm64:
  case gpr_w2_arm64:
  case gpr_w3_arm64:
  case gpr_w4_arm64:
  case gpr_w5_arm64:
  case gpr_w6_arm64:
  case gpr_w7_arm64:
  case gpr_w8_arm64:
  case gpr_w9_arm64:
  case gpr_w10_arm64:
  case gpr_w11_arm64:
  case gpr_w12_arm64:
  case gpr_w13_arm64:
  case gpr_w14_arm64:
  case gpr_w15_arm64:
  case gpr_w16_arm64:
  case gpr_w17_arm64:
  case gpr_w18_arm64:
  case gpr_w19_arm64:
  case gpr_w20_arm64:
  case gpr_w21_arm64:
  case gpr_w22_arm64:
  case gpr_w23_arm64:
  case gpr_w24_arm64:
  case gpr_w25_arm64:
  case gpr_w26_arm64:
  case gpr_w27_arm64:
  case gpr_w28_arm64:
    context->X[reg - gpr_w0_arm64] = reg_value.GetAsUInt32();
    break;
  }
 
  return SetThreadContextHelper(thread_handle, context);
}
 
Status NativeRegisterContextWindows_arm64::FPRRead(const uint32_t reg,
                                                   RegisterValue &reg_value) {
  Status error = CacheAllRegisterValues();
  if (error.Fail())
    return error;
 
  switch (reg) {
  case fpu_v0_arm64:
  case fpu_v1_arm64:
  case fpu_v2_arm64:
  case fpu_v3_arm64:
  case fpu_v4_arm64:
  case fpu_v5_arm64:
  case fpu_v6_arm64:
  case fpu_v7_arm64:
  case fpu_v8_arm64:
  case fpu_v9_arm64:
  case fpu_v10_arm64:
  case fpu_v11_arm64:
  case fpu_v12_arm64:
  case fpu_v13_arm64:
  case fpu_v14_arm64:
  case fpu_v15_arm64:
  case fpu_v16_arm64:
  case fpu_v17_arm64:
  case fpu_v18_arm64:
  case fpu_v19_arm64:
  case fpu_v20_arm64:
  case fpu_v21_arm64:
  case fpu_v22_arm64:
  case fpu_v23_arm64:
  case fpu_v24_arm64:
  case fpu_v25_arm64:
  case fpu_v26_arm64:
  case fpu_v27_arm64:
  case fpu_v28_arm64:
  case fpu_v29_arm64:
  case fpu_v30_arm64:
  case fpu_v31_arm64:
    reg_value.SetBytes(m_context->V[reg - fpu_v0_arm64].B, 16,
                       endian::InlHostByteOrder());
    break;
 
  case fpu_s0_arm64:
  case fpu_s1_arm64:
  case fpu_s2_arm64:
  case fpu_s3_arm64:
  case fpu_s4_arm64:
  case fpu_s5_arm64:
  case fpu_s6_arm64:
  case fpu_s7_arm64:
  case fpu_s8_arm64:
  case fpu_s9_arm64:
  case fpu_s10_arm64:
  case fpu_s11_arm64:
  case fpu_s12_arm64:
  case fpu_s13_arm64:
  case fpu_s14_arm64:
  case fpu_s15_arm64:
  case fpu_s16_arm64:
  case fpu_s17_arm64:
  case fpu_s18_arm64:
  case fpu_s19_arm64:
  case fpu_s20_arm64:
  case fpu_s21_arm64:
  case fpu_s22_arm64:
  case fpu_s23_arm64:
  case fpu_s24_arm64:
  case fpu_s25_arm64:
  case fpu_s26_arm64:
  case fpu_s27_arm64:
  case fpu_s28_arm64:
  case fpu_s29_arm64:
  case fpu_s30_arm64:
  case fpu_s31_arm64:
    reg_value.SetFloat(m_context->V[reg - fpu_s0_arm64].S[0]);
    break;
 
  case fpu_d0_arm64:
  case fpu_d1_arm64:
  case fpu_d2_arm64:
  case fpu_d3_arm64:
  case fpu_d4_arm64:
  case fpu_d5_arm64:
  case fpu_d6_arm64:
  case fpu_d7_arm64:
  case fpu_d8_arm64:
  case fpu_d9_arm64:
  case fpu_d10_arm64:
  case fpu_d11_arm64:
  case fpu_d12_arm64:
  case fpu_d13_arm64:
  case fpu_d14_arm64:
  case fpu_d15_arm64:
  case fpu_d16_arm64:
  case fpu_d17_arm64:
  case fpu_d18_arm64:
  case fpu_d19_arm64:
  case fpu_d20_arm64:
  case fpu_d21_arm64:
  case fpu_d22_arm64:
  case fpu_d23_arm64:
  case fpu_d24_arm64:
  case fpu_d25_arm64:
  case fpu_d26_arm64:
  case fpu_d27_arm64:
  case fpu_d28_arm64:
  case fpu_d29_arm64:
  case fpu_d30_arm64:
  case fpu_d31_arm64:
    reg_value.SetDouble(m_context->V[reg - fpu_d0_arm64].D[0]);
    break;
 
  case fpu_fpsr_arm64:
    reg_value.SetUInt32(m_context->Fpsr);
    break;
 
  case fpu_fpcr_arm64:
    reg_value.SetUInt32(m_context->Fpcr);
    break;
  }
 
  return error;
}
 
Status
NativeRegisterContextWindows_arm64::FPRWrite(const uint32_t reg,
                                             const RegisterValue &reg_value) {
  auto cleanup = llvm::make_scope_exit([&]() { m_context = nullptr; });
 
  PCONTEXT context = nullptr;
  DataBufferHeap context_buffer;
  DWORD context_flags = CONTEXT_CONTROL | CONTEXT_FLOATING_POINT;
  auto thread_handle = GetThreadHandle();
 
  Status error = GetThreadContextHelper(thread_handle, context_flags, context,
                                        &context_buffer);
  if (error.Fail())
    return error;
 
  switch (reg) {
  case fpu_v0_arm64:
  case fpu_v1_arm64:
  case fpu_v2_arm64:
  case fpu_v3_arm64:
  case fpu_v4_arm64:
  case fpu_v5_arm64:
  case fpu_v6_arm64:
  case fpu_v7_arm64:
  case fpu_v8_arm64:
  case fpu_v9_arm64:
  case fpu_v10_arm64:
  case fpu_v11_arm64:
  case fpu_v12_arm64:
  case fpu_v13_arm64:
  case fpu_v14_arm64:
  case fpu_v15_arm64:
  case fpu_v16_arm64:
  case fpu_v17_arm64:
  case fpu_v18_arm64:
  case fpu_v19_arm64:
  case fpu_v20_arm64:
  case fpu_v21_arm64:
  case fpu_v22_arm64:
  case fpu_v23_arm64:
  case fpu_v24_arm64:
  case fpu_v25_arm64:
  case fpu_v26_arm64:
  case fpu_v27_arm64:
  case fpu_v28_arm64:
  case fpu_v29_arm64:
  case fpu_v30_arm64:
  case fpu_v31_arm64:
    memcpy(context->V[reg - fpu_v0_arm64].B, reg_value.GetBytes(), 16);
    break;
 
  case fpu_s0_arm64:
  case fpu_s1_arm64:
  case fpu_s2_arm64:
  case fpu_s3_arm64:
  case fpu_s4_arm64:
  case fpu_s5_arm64:
  case fpu_s6_arm64:
  case fpu_s7_arm64:
  case fpu_s8_arm64:
  case fpu_s9_arm64:
  case fpu_s10_arm64:
  case fpu_s11_arm64:
  case fpu_s12_arm64:
  case fpu_s13_arm64:
  case fpu_s14_arm64:
  case fpu_s15_arm64:
  case fpu_s16_arm64:
  case fpu_s17_arm64:
  case fpu_s18_arm64:
  case fpu_s19_arm64:
  case fpu_s20_arm64:
  case fpu_s21_arm64:
  case fpu_s22_arm64:
  case fpu_s23_arm64:
  case fpu_s24_arm64:
  case fpu_s25_arm64:
  case fpu_s26_arm64:
  case fpu_s27_arm64:
  case fpu_s28_arm64:
  case fpu_s29_arm64:
  case fpu_s30_arm64:
  case fpu_s31_arm64:
    context->V[reg - fpu_s0_arm64].S[0] = reg_value.GetAsFloat();
    break;
 
  case fpu_d0_arm64:
  case fpu_d1_arm64:
  case fpu_d2_arm64:
  case fpu_d3_arm64:
  case fpu_d4_arm64:
  case fpu_d5_arm64:
  case fpu_d6_arm64:
  case fpu_d7_arm64:
  case fpu_d8_arm64:
  case fpu_d9_arm64:
  case fpu_d10_arm64:
  case fpu_d11_arm64:
  case fpu_d12_arm64:
  case fpu_d13_arm64:
  case fpu_d14_arm64:
  case fpu_d15_arm64:
  case fpu_d16_arm64:
  case fpu_d17_arm64:
  case fpu_d18_arm64:
  case fpu_d19_arm64:
  case fpu_d20_arm64:
  case fpu_d21_arm64:
  case fpu_d22_arm64:
  case fpu_d23_arm64:
  case fpu_d24_arm64:
  case fpu_d25_arm64:
  case fpu_d26_arm64:
  case fpu_d27_arm64:
  case fpu_d28_arm64:
  case fpu_d29_arm64:
  case fpu_d30_arm64:
  case fpu_d31_arm64:
    context->V[reg - fpu_d0_arm64].D[0] = reg_value.GetAsDouble();
    break;
 
  case fpu_fpsr_arm64:
    context->Fpsr = reg_value.GetAsUInt32();
    break;
 
  case fpu_fpcr_arm64:
    context->Fpcr = reg_value.GetAsUInt32();
    break;
  }
 
  return SetThreadContextHelper(thread_handle, context);
}
 
Status
NativeRegisterContextWindows_arm64::ReadRegister(const RegisterInfo *reg_info,
                                                 RegisterValue &reg_value) {
  Status error;
  if (!reg_info) {
    error = Status::FromErrorString("reg_info NULL");
    return error;
  }
 
  const 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 = Status::FromErrorStringWithFormat(
        "register \"%s\" is an internal-only lldb "
        "register, cannot read directly",
        reg_info->name);
    return error;
  }
 
  if (IsGPR(reg))
    return GPRRead(reg, reg_value);
 
  if (IsFPR(reg))
    return FPRRead(reg, reg_value);
 
  return Status::FromErrorString("unimplemented");
}
 
Status NativeRegisterContextWindows_arm64::WriteRegister(
    const RegisterInfo *reg_info, const RegisterValue &reg_value) {
  Status error;
 
  if (!reg_info) {
    error = Status::FromErrorString("reg_info NULL");
    return error;
  }
 
  const 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 written.
    error = Status::FromErrorStringWithFormat(
        "register \"%s\" is an internal-only lldb "
        "register, cannot write directly",
        reg_info->name);
    return error;
  }
 
  if (IsGPR(reg))
    return GPRWrite(reg, reg_value);
 
  if (IsFPR(reg))
    return FPRWrite(reg, reg_value);
 
  return Status::FromErrorString("unimplemented");
}
 
Status NativeRegisterContextWindows_arm64::ReadAllRegisterValues(
    lldb::WritableDataBufferSP &data_sp) {
  Log *log = GetLog(WindowsLog::Registers);
 
  Status error = CacheAllRegisterValues();
  if (error.Fail())
    return error;
 
  if (!m_context_buffer) {
    error = Status::FromErrorString("register context buffer is not available");
    LLDB_LOG(log, "{0}", error);
    return error;
  }
 
  data_sp = std::make_shared<DataBufferHeap>(m_context_buffer->GetBytes(),
                                             m_context_buffer->GetByteSize());
 
  return error;
}
 
Status NativeRegisterContextWindows_arm64::WriteAllRegisterValues(
    const lldb::DataBufferSP &data_sp) {
  auto cleanup = llvm::make_scope_exit([&]() { m_context = nullptr; });
 
  Log *log = GetLog(WindowsLog::Registers);
  Status error;
 
  if (!data_sp) {
    error = Status::FromErrorString("invalid data_sp");
    LLDB_LOG(log, "{0}", error);
    return error;
  }
 
  DWORD context_flags = CONTEXT_ALL;
  DWORD context_length = 0;
 
  error = GetThreadContextLength(context_flags, context_length);
  if (error.Fail())
    return error;
 
  if (data_sp->GetByteSize() != context_length) {
    error = Status::FromErrorStringWithFormatv(
        "data_sp contained mismatched data size, expected {0}, actual {1}",
        context_length, data_sp->GetByteSize());
    LLDB_LOG(log, "{0}", error);
    return error;
  }
 
  PCONTEXT context = nullptr;
  DataBufferHeap context_buffer;
  error = GetThreadContextHelper(GetThreadHandle(), context_flags, context,
                                 &context_buffer);
  if (error.Fail())
    return error;
 
  ::memcpy(context_buffer.GetBytes(), data_sp->GetBytes(), context_length);
 
  return SetThreadContextHelper(GetThreadHandle(), context);
}
 
llvm::Error NativeRegisterContextWindows_arm64::ReadHardwareDebugInfo() {
  Status error = CacheAllRegisterValues();
  if (error.Fail())
    return error.ToError();
 
  for (uint32_t i = 0; i < m_max_hwp_supported; i++) {
    m_hwp_regs[i].address = m_context->Wvr[i];
    m_hwp_regs[i].control = m_context->Wcr[i];
  }
 
  return llvm::Error::success();
}
 
llvm::Error
NativeRegisterContextWindows_arm64::WriteHardwareDebugRegs(DREGType hwbType) {
  auto cleanup = llvm::make_scope_exit([&]() { m_context = nullptr; });
 
  PCONTEXT context = nullptr;
  DataBufferHeap context_buffer;
  DWORD context_flags = CONTEXT_DEBUG_REGISTERS;
  auto thread_handle = GetThreadHandle();
 
  Status error = GetThreadContextHelper(thread_handle, context_flags, context,
                                        &context_buffer);
  if (error.Fail())
    return error.ToError();
 
  if (hwbType == eDREGTypeWATCH) {
    for (uint32_t i = 0; i < m_max_hwp_supported; i++) {
      context->Wvr[i] = m_hwp_regs[i].address;
      context->Wcr[i] = m_hwp_regs[i].control;
    }
  }
 
  return SetThreadContextHelper(GetThreadHandle(), context).ToError();
}
 
void NativeRegisterContextWindows_arm64::InvalidateAllRegisters() {
  m_context = nullptr;
  m_context_buffer.reset();
}
 
Status NativeRegisterContextWindows_arm64::CacheAllRegisterValues() {
  Status error;
  DWORD context_flags = CONTEXT_ALL;
 
  if (m_context && (m_context->ContextFlags & context_flags) == context_flags)
    return error;
 
  m_context = nullptr;
 
  if (!m_context_buffer)
    m_context_buffer = std::make_shared<DataBufferHeap>();
 
  error = GetThreadContextHelper(GetThreadHandle(), context_flags, m_context,
                                 m_context_buffer.get());
 
  if (error.Fail())
    m_context = nullptr;
 
  return error;
}
 
#endif // defined(__aarch64__) || defined(_M_ARM64)