1 //===-- RegisterContextPOSIXCore_arm64.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_arm64.h"
10 
11 #include "Plugins/Process/elf-core/RegisterUtilities.h"
12 #include "lldb/Target/Thread.h"
13 #include "lldb/Utility/RegisterValue.h"
14 
15 #include <memory>
16 
17 using namespace lldb_private;
18 
19 RegisterContextCorePOSIX_arm64::RegisterContextCorePOSIX_arm64(
20     Thread &thread, std::unique_ptr<RegisterInfoPOSIX_arm64> register_info,
21     const DataExtractor &gpregset, llvm::ArrayRef<CoreNote> notes)
22     : RegisterContextPOSIX_arm64(thread, std::move(register_info)) {
23   m_gpr_buffer = std::make_shared<DataBufferHeap>(gpregset.GetDataStart(),
24                                                   gpregset.GetByteSize());
25   m_gpr.SetData(m_gpr_buffer);
26   m_gpr.SetByteOrder(gpregset.GetByteOrder());
27 
28   m_fpregset = getRegset(
29       notes, m_register_info_up->GetTargetArchitecture().GetTriple(), FPR_Desc);
30 }
31 
32 RegisterContextCorePOSIX_arm64::~RegisterContextCorePOSIX_arm64() {}
33 
34 bool RegisterContextCorePOSIX_arm64::ReadGPR() { return true; }
35 
36 bool RegisterContextCorePOSIX_arm64::ReadFPR() { return false; }
37 
38 bool RegisterContextCorePOSIX_arm64::WriteGPR() {
39   assert(0);
40   return false;
41 }
42 
43 bool RegisterContextCorePOSIX_arm64::WriteFPR() {
44   assert(0);
45   return false;
46 }
47 
48 bool RegisterContextCorePOSIX_arm64::ReadRegister(const RegisterInfo *reg_info,
49                                                   RegisterValue &value) {
50   lldb::offset_t offset = reg_info->byte_offset;
51   if (offset + reg_info->byte_size <= GetGPRSize()) {
52     uint64_t v = m_gpr.GetMaxU64(&offset, reg_info->byte_size);
53     if (offset == reg_info->byte_offset + reg_info->byte_size) {
54       value = v;
55       return true;
56     }
57   }
58 
59   const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
60   if (reg == LLDB_INVALID_REGNUM)
61     return false;
62 
63   offset -= GetGPRSize();
64   if (IsFPR(reg) && offset + reg_info->byte_size <= GetFPUSize()) {
65     Status error;
66     value.SetFromMemoryData(reg_info, m_fpregset.GetDataStart() + offset,
67                             reg_info->byte_size, lldb::eByteOrderLittle, error);
68     return error.Success();
69   }
70 
71   return false;
72 }
73 
74 bool RegisterContextCorePOSIX_arm64::ReadAllRegisterValues(
75     lldb::DataBufferSP &data_sp) {
76   return false;
77 }
78 
79 bool RegisterContextCorePOSIX_arm64::WriteRegister(const RegisterInfo *reg_info,
80                                                    const RegisterValue &value) {
81   return false;
82 }
83 
84 bool RegisterContextCorePOSIX_arm64::WriteAllRegisterValues(
85     const lldb::DataBufferSP &data_sp) {
86   return false;
87 }
88 
89 bool RegisterContextCorePOSIX_arm64::HardwareSingleStep(bool enable) {
90   return false;
91 }
92