1//===-- RegisterContextFreeBSDKernel_i386.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 "RegisterContextFreeBSDKernel_i386.h"
10
11#include "lldb/Target/Process.h"
12#include "lldb/Target/Thread.h"
13#include "lldb/Utility/RegisterValue.h"
14#include "llvm/Support/Endian.h"
15
16using namespace lldb;
17using namespace lldb_private;
18
19RegisterContextFreeBSDKernel_i386::RegisterContextFreeBSDKernel_i386(
20    Thread &thread, RegisterInfoInterface *register_info, lldb::addr_t pcb_addr)
21    : RegisterContextPOSIX_x86(thread, 0, register_info), m_pcb_addr(pcb_addr) {
22}
23
24bool RegisterContextFreeBSDKernel_i386::ReadGPR() { return true; }
25
26bool RegisterContextFreeBSDKernel_i386::ReadFPR() { return true; }
27
28bool RegisterContextFreeBSDKernel_i386::WriteGPR() {
29  assert(0);
30  return false;
31}
32
33bool RegisterContextFreeBSDKernel_i386::WriteFPR() {
34  assert(0);
35  return false;
36}
37
38bool RegisterContextFreeBSDKernel_i386::ReadRegister(
39    const RegisterInfo *reg_info, RegisterValue &value) {
40  if (m_pcb_addr == LLDB_INVALID_ADDRESS)
41    return false;
42
43  struct {
44    llvm::support::ulittle32_t edi;
45    llvm::support::ulittle32_t esi;
46    llvm::support::ulittle32_t ebp;
47    llvm::support::ulittle32_t esp;
48    llvm::support::ulittle32_t ebx;
49    llvm::support::ulittle32_t eip;
50  } pcb;
51
52  Status error;
53  size_t rd =
54      m_thread.GetProcess()->ReadMemory(m_pcb_addr, &pcb, sizeof(pcb), error);
55  if (rd != sizeof(pcb))
56    return false;
57
58  uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
59  switch (reg) {
60#define REG(x)                                                                 \
61  case lldb_##x##_i386:                                                      \
62    value = pcb.x;                                                             \
63    break;
64
65    REG(edi);
66    REG(esi);
67    REG(ebp);
68    REG(esp);
69    REG(eip);
70
71#undef REG
72
73  default:
74    return false;
75  }
76
77  return true;
78}
79
80bool RegisterContextFreeBSDKernel_i386::WriteRegister(
81    const RegisterInfo *reg_info, const RegisterValue &value) {
82  return false;
83}
84