1//===-- RegisterContextPOSIXCore_x86_64.cpp -------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "RegisterContextPOSIXCore_x86_64.h"
10#include "lldb/Target/Thread.h"
11#include "lldb/Utility/DataExtractor.h"
12#include "lldb/Utility/RegisterValue.h"
13
14using namespace lldb_private;
15
16RegisterContextCorePOSIX_x86_64::RegisterContextCorePOSIX_x86_64(
17    Thread &thread, RegisterInfoInterface *register_info,
18    const DataExtractor &gpregset, llvm::ArrayRef<CoreNote> notes)
19    : RegisterContextPOSIX_x86(thread, 0, register_info) {
20  size_t size, len;
21
22  size = GetGPRSize();
23  m_gpregset.reset(new uint8_t[size]);
24  len =
25      gpregset.ExtractBytes(0, size, lldb::eByteOrderLittle, m_gpregset.get());
26  if (len != size)
27    m_gpregset.reset();
28
29  DataExtractor fpregset = getRegset(
30      notes, register_info->GetTargetArchitecture().GetTriple(), FPR_Desc);
31  size = sizeof(FXSAVE);
32  m_fpregset.reset(new uint8_t[size]);
33  len =
34      fpregset.ExtractBytes(0, size, lldb::eByteOrderLittle, m_fpregset.get());
35  if (len != size)
36    m_fpregset.reset();
37}
38
39bool RegisterContextCorePOSIX_x86_64::ReadGPR() {
40  return m_gpregset != nullptr;
41}
42
43bool RegisterContextCorePOSIX_x86_64::ReadFPR() {
44  return m_fpregset != nullptr;
45}
46
47bool RegisterContextCorePOSIX_x86_64::WriteGPR() {
48  assert(0);
49  return false;
50}
51
52bool RegisterContextCorePOSIX_x86_64::WriteFPR() {
53  assert(0);
54  return false;
55}
56
57bool RegisterContextCorePOSIX_x86_64::ReadRegister(const RegisterInfo *reg_info,
58                                                   RegisterValue &value) {
59  const uint8_t *src;
60  size_t offset;
61  const size_t fxsave_offset = reg_info->byte_offset - GetFXSAVEOffset();
62  // make the offset relative to the beginning of the FXSAVE structure because
63  // this is the data that we have (not the entire UserArea)
64
65  if (m_gpregset && reg_info->byte_offset < GetGPRSize()) {
66    src = m_gpregset.get();
67    offset = reg_info->byte_offset;
68  } else if (m_fpregset && fxsave_offset < sizeof(FXSAVE)) {
69    src = m_fpregset.get();
70    offset = fxsave_offset;
71  } else {
72    return false;
73  }
74
75  Status error;
76  value.SetFromMemoryData(*reg_info, src + offset, reg_info->byte_size,
77                          lldb::eByteOrderLittle, error);
78
79  return error.Success();
80}
81
82bool RegisterContextCorePOSIX_x86_64::ReadAllRegisterValues(
83    lldb::WritableDataBufferSP &data_sp) {
84  return false;
85}
86
87bool RegisterContextCorePOSIX_x86_64::WriteRegister(
88    const RegisterInfo *reg_info, const RegisterValue &value) {
89  return false;
90}
91
92bool RegisterContextCorePOSIX_x86_64::WriteAllRegisterValues(
93    const lldb::DataBufferSP &data_sp) {
94  return false;
95}
96
97bool RegisterContextCorePOSIX_x86_64::HardwareSingleStep(bool enable) {
98  return false;
99}
100