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(vm_addr: m_pcb_addr, buf: &pcb, size: 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

source code of lldb/source/Plugins/Process/FreeBSDKernel/RegisterContextFreeBSDKernel_i386.cpp