1//===-- RegisterContextFreeBSDKernel_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 "RegisterContextFreeBSDKernel_x86_64.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_x86_64::RegisterContextFreeBSDKernel_x86_64(
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_x86_64::ReadGPR() { return true; }
25
26bool RegisterContextFreeBSDKernel_x86_64::ReadFPR() { return true; }
27
28bool RegisterContextFreeBSDKernel_x86_64::WriteGPR() {
29 assert(0);
30 return false;
31}
32
33bool RegisterContextFreeBSDKernel_x86_64::WriteFPR() {
34 assert(0);
35 return false;
36}
37
38bool RegisterContextFreeBSDKernel_x86_64::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::ulittle64_t r15;
45 llvm::support::ulittle64_t r14;
46 llvm::support::ulittle64_t r13;
47 llvm::support::ulittle64_t r12;
48 llvm::support::ulittle64_t rbp;
49 llvm::support::ulittle64_t rsp;
50 llvm::support::ulittle64_t rbx;
51 llvm::support::ulittle64_t rip;
52 } pcb;
53
54 Status error;
55 size_t rd =
56 m_thread.GetProcess()->ReadMemory(vm_addr: m_pcb_addr, buf: &pcb, size: sizeof(pcb), error);
57 if (rd != sizeof(pcb))
58 return false;
59
60 uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
61 switch (reg) {
62#define REG(x) \
63 case lldb_##x##_x86_64: \
64 value = pcb.x; \
65 break;
66
67 REG(r15);
68 REG(r14);
69 REG(r13);
70 REG(r12);
71 REG(rbp);
72 REG(rsp);
73 REG(rbx);
74 REG(rip);
75
76#undef REG
77
78 default:
79 return false;
80 }
81
82 return true;
83}
84
85bool RegisterContextFreeBSDKernel_x86_64::WriteRegister(
86 const RegisterInfo *reg_info, const RegisterValue &value) {
87 return false;
88}
89

source code of lldb/source/Plugins/Process/FreeBSDKernel/RegisterContextFreeBSDKernel_x86_64.cpp