]> CyberLeo.Net >> Repos - FreeBSD/FreeBSD.git/blob - contrib/llvm-project/lldb/source/Plugins/Process/elf-core/ProcessElfCore.h
Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
[FreeBSD/FreeBSD.git] / contrib / llvm-project / lldb / source / Plugins / Process / elf-core / ProcessElfCore.h
1 //===-- ProcessElfCore.h ----------------------------------------*- C++ -*-===//
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 // Notes about Linux Process core dumps:
8 //  1) Linux core dump is stored as ELF file.
9 //  2) The ELF file's PT_NOTE and PT_LOAD segments describes the program's
10 //     address space and thread contexts.
11 //  3) PT_NOTE segment contains note entries which describes a thread context.
12 //  4) PT_LOAD segment describes a valid contiguous range of process address
13 //     space.
14 //===----------------------------------------------------------------------===//
15
16 #ifndef liblldb_ProcessElfCore_h_
17 #define liblldb_ProcessElfCore_h_
18
19 #include <list>
20 #include <vector>
21
22 #include "lldb/Target/Process.h"
23 #include "lldb/Utility/ConstString.h"
24 #include "lldb/Utility/Status.h"
25
26 #include "Plugins/ObjectFile/ELF/ELFHeader.h"
27 #include "Plugins/Process/elf-core/RegisterUtilities.h"
28
29 struct ThreadData;
30
31 class ProcessElfCore : public lldb_private::Process {
32 public:
33   // Constructors and Destructors
34   static lldb::ProcessSP
35   CreateInstance(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp,
36                  const lldb_private::FileSpec *crash_file_path);
37
38   static void Initialize();
39
40   static void Terminate();
41
42   static lldb_private::ConstString GetPluginNameStatic();
43
44   static const char *GetPluginDescriptionStatic();
45
46   // Constructors and Destructors
47   ProcessElfCore(lldb::TargetSP target_sp, lldb::ListenerSP listener_sp,
48                  const lldb_private::FileSpec &core_file);
49
50   ~ProcessElfCore() override;
51
52   // Check if a given Process
53   bool CanDebug(lldb::TargetSP target_sp,
54                 bool plugin_specified_by_name) override;
55
56   // Creating a new process, or attaching to an existing one
57   lldb_private::Status DoLoadCore() override;
58
59   lldb_private::DynamicLoader *GetDynamicLoader() override;
60
61   // PluginInterface protocol
62   lldb_private::ConstString GetPluginName() override;
63
64   uint32_t GetPluginVersion() override;
65
66   // Process Control
67   lldb_private::Status DoDestroy() override;
68
69   void RefreshStateAfterStop() override;
70
71   lldb_private::Status WillResume() override {
72     lldb_private::Status error;
73     error.SetErrorStringWithFormat(
74         "error: %s does not support resuming processes",
75         GetPluginName().GetCString());
76     return error;
77   }
78
79   // Process Queries
80   bool IsAlive() override;
81
82   bool WarnBeforeDetach() const override { return false; }
83
84   // Process Memory
85   size_t ReadMemory(lldb::addr_t addr, void *buf, size_t size,
86                     lldb_private::Status &error) override;
87
88   size_t DoReadMemory(lldb::addr_t addr, void *buf, size_t size,
89                       lldb_private::Status &error) override;
90
91   lldb_private::Status
92   GetMemoryRegionInfo(lldb::addr_t load_addr,
93                       lldb_private::MemoryRegionInfo &region_info) override;
94
95   lldb::addr_t GetImageInfoAddress() override;
96
97   lldb_private::ArchSpec GetArchitecture();
98
99   // Returns AUXV structure found in the core file
100   lldb_private::DataExtractor GetAuxvData() override;
101
102   bool GetProcessInfo(lldb_private::ProcessInstanceInfo &info) override;
103
104 protected:
105   void Clear();
106
107   bool UpdateThreadList(lldb_private::ThreadList &old_thread_list,
108                         lldb_private::ThreadList &new_thread_list) override;
109
110 private:
111   struct NT_FILE_Entry {
112     lldb::addr_t start;
113     lldb::addr_t end;
114     lldb::addr_t file_ofs;
115     lldb_private::ConstString path;
116   };
117
118   // For ProcessElfCore only
119   typedef lldb_private::Range<lldb::addr_t, lldb::addr_t> FileRange;
120   typedef lldb_private::RangeDataVector<lldb::addr_t, lldb::addr_t, FileRange>
121       VMRangeToFileOffset;
122   typedef lldb_private::RangeDataVector<lldb::addr_t, lldb::addr_t, uint32_t>
123       VMRangeToPermissions;
124
125   lldb::ModuleSP m_core_module_sp;
126   lldb_private::FileSpec m_core_file;
127   std::string m_dyld_plugin_name;
128   DISALLOW_COPY_AND_ASSIGN(ProcessElfCore);
129
130   // True if m_thread_contexts contains valid entries
131   bool m_thread_data_valid = false;
132
133   // Contain thread data read from NOTE segments
134   std::vector<ThreadData> m_thread_data;
135
136   // AUXV structure found from the NOTE segment
137   lldb_private::DataExtractor m_auxv;
138
139   // Address ranges found in the core
140   VMRangeToFileOffset m_core_aranges;
141
142   // Permissions for all ranges
143   VMRangeToPermissions m_core_range_infos;
144
145   // NT_FILE entries found from the NOTE segment
146   std::vector<NT_FILE_Entry> m_nt_file_entries;
147
148   // Parse thread(s) data structures(prstatus, prpsinfo) from given NOTE segment
149   llvm::Error ParseThreadContextsFromNoteSegment(
150       const elf::ELFProgramHeader &segment_header,
151       lldb_private::DataExtractor segment_data);
152
153   // Returns number of thread contexts stored in the core file
154   uint32_t GetNumThreadContexts();
155
156   // Parse a contiguous address range of the process from LOAD segment
157   lldb::addr_t
158   AddAddressRangeFromLoadSegment(const elf::ELFProgramHeader &header);
159
160   llvm::Expected<std::vector<lldb_private::CoreNote>>
161   parseSegment(const lldb_private::DataExtractor &segment);
162   llvm::Error parseFreeBSDNotes(llvm::ArrayRef<lldb_private::CoreNote> notes);
163   llvm::Error parseNetBSDNotes(llvm::ArrayRef<lldb_private::CoreNote> notes);
164   llvm::Error parseOpenBSDNotes(llvm::ArrayRef<lldb_private::CoreNote> notes);
165   llvm::Error parseLinuxNotes(llvm::ArrayRef<lldb_private::CoreNote> notes);
166 };
167
168 #endif // liblldb_ProcessElfCore_h_