1 //===-- ProcessElfCore.cpp --------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
13 // Other libraries and framework includes
14 #include "lldb/Core/PluginManager.h"
15 #include "lldb/Core/Module.h"
16 #include "lldb/Core/ModuleSpec.h"
17 #include "lldb/Core/Section.h"
18 #include "lldb/Core/State.h"
19 #include "lldb/Core/DataBufferHeap.h"
20 #include "lldb/Target/Target.h"
21 #include "lldb/Target/DynamicLoader.h"
22 #include "ProcessPOSIXLog.h"
24 #include "Plugins/ObjectFile/ELF/ObjectFileELF.h"
25 #include "Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.h"
28 #include "ProcessElfCore.h"
29 #include "ThreadElfCore.h"
31 using namespace lldb_private;
34 ProcessElfCore::GetPluginNameStatic()
36 static ConstString g_name("elf-core");
41 ProcessElfCore::GetPluginDescriptionStatic()
43 return "ELF core dump plug-in.";
47 ProcessElfCore::Terminate()
49 PluginManager::UnregisterPlugin (ProcessElfCore::CreateInstance);
54 ProcessElfCore::CreateInstance (Target &target, Listener &listener, const FileSpec *crash_file)
56 lldb::ProcessSP process_sp;
58 process_sp.reset(new ProcessElfCore (target, listener, *crash_file));
63 ProcessElfCore::CanDebug(Target &target, bool plugin_specified_by_name)
65 // For now we are just making sure the file exists for a given module
66 if (!m_core_module_sp && m_core_file.Exists())
68 ModuleSpec core_module_spec(m_core_file, target.GetArchitecture());
69 Error error (ModuleList::GetSharedModule (core_module_spec, m_core_module_sp,
73 ObjectFile *core_objfile = m_core_module_sp->GetObjectFile();
74 if (core_objfile && core_objfile->GetType() == ObjectFile::eTypeCoreFile)
81 //----------------------------------------------------------------------
82 // ProcessElfCore constructor
83 //----------------------------------------------------------------------
84 ProcessElfCore::ProcessElfCore(Target& target, Listener &listener,
85 const FileSpec &core_file) :
86 Process (target, listener),
88 m_core_file (core_file),
89 m_dyld_plugin_name (),
90 m_thread_data_valid(false),
96 //----------------------------------------------------------------------
98 //----------------------------------------------------------------------
99 ProcessElfCore::~ProcessElfCore()
102 // We need to call finalize on the process before destroying ourselves
103 // to make sure all of the broadcaster cleanup goes as planned. If we
104 // destruct this class, then Process::~Process() might have problems
105 // trying to fully destroy the broadcaster.
109 //----------------------------------------------------------------------
111 //----------------------------------------------------------------------
113 ProcessElfCore::GetPluginName()
115 return GetPluginNameStatic();
119 ProcessElfCore::GetPluginVersion()
125 ProcessElfCore::AddAddressRangeFromLoadSegment(const elf::ELFProgramHeader *header)
127 lldb::addr_t addr = header->p_vaddr;
128 FileRange file_range (header->p_offset, header->p_filesz);
129 VMRangeToFileOffset::Entry range_entry(addr, header->p_memsz, file_range);
131 VMRangeToFileOffset::Entry *last_entry = m_core_aranges.Back();
133 last_entry->GetRangeEnd() == range_entry.GetRangeBase() &&
134 last_entry->data.GetRangeEnd() == range_entry.data.GetRangeBase() &&
135 last_entry->GetByteSize() == last_entry->data.GetByteSize())
137 last_entry->SetRangeEnd (range_entry.GetRangeEnd());
138 last_entry->data.SetRangeEnd (range_entry.data.GetRangeEnd());
142 m_core_aranges.Append(range_entry);
148 //----------------------------------------------------------------------
150 //----------------------------------------------------------------------
152 ProcessElfCore::DoLoadCore ()
155 if (!m_core_module_sp)
157 error.SetErrorString ("invalid core module");
161 ObjectFileELF *core = (ObjectFileELF *)(m_core_module_sp->GetObjectFile());
164 error.SetErrorString ("invalid core object file");
168 const uint32_t num_segments = core->GetProgramHeaderCount();
169 if (num_segments == 0)
171 error.SetErrorString ("core file has no sections");
177 m_thread_data_valid = true;
179 bool ranges_are_sorted = true;
180 lldb::addr_t vm_addr = 0;
181 /// Walk through segments and Thread and Address Map information.
182 /// PT_NOTE - Contains Thread and Register information
183 /// PT_LOAD - Contains a contiguous range of Process Address Space
184 for(uint32_t i = 1; i <= num_segments; i++)
186 const elf::ELFProgramHeader *header = core->GetProgramHeaderByIndex(i);
187 assert(header != NULL);
189 DataExtractor data = core->GetSegmentDataByIndex(i);
191 // Parse thread contexts and auxv structure
192 if (header->p_type == llvm::ELF::PT_NOTE)
193 ParseThreadContextsFromNoteSegment(header, data);
195 // PT_LOAD segments contains address map
196 if (header->p_type == llvm::ELF::PT_LOAD)
198 lldb::addr_t last_addr = AddAddressRangeFromLoadSegment(header);
199 if (vm_addr > last_addr)
200 ranges_are_sorted = false;
205 if (!ranges_are_sorted)
206 m_core_aranges.Sort();
208 // Even if the architecture is set in the target, we need to override
209 // it to match the core file which is always single arch.
210 ArchSpec arch (m_core_module_sp->GetArchitecture());
212 m_target.SetArchitecture(arch);
217 lldb_private::DynamicLoader *
218 ProcessElfCore::GetDynamicLoader ()
220 if (m_dyld_ap.get() == NULL)
221 m_dyld_ap.reset (DynamicLoader::FindPlugin(this, DynamicLoaderPOSIXDYLD::GetPluginNameStatic().GetCString()));
222 return m_dyld_ap.get();
226 ProcessElfCore::UpdateThreadList (ThreadList &old_thread_list, ThreadList &new_thread_list)
228 const uint32_t num_threads = GetNumThreadContexts ();
229 if (!m_thread_data_valid)
232 for (lldb::tid_t tid = 0; tid < num_threads; ++tid)
234 const ThreadData &td = m_thread_data[tid];
235 lldb::ThreadSP thread_sp(new ThreadElfCore (*this, tid, td));
236 new_thread_list.AddThread (thread_sp);
238 return new_thread_list.GetSize(false) > 0;
242 ProcessElfCore::RefreshStateAfterStop ()
247 ProcessElfCore::DoDestroy ()
252 //------------------------------------------------------------------
254 //------------------------------------------------------------------
257 ProcessElfCore::IsAlive ()
262 //------------------------------------------------------------------
264 //------------------------------------------------------------------
266 ProcessElfCore::ReadMemory (lldb::addr_t addr, void *buf, size_t size, Error &error)
268 // Don't allow the caching that lldb_private::Process::ReadMemory does
269 // since in core files we have it all cached our our core file anyway.
270 return DoReadMemory (addr, buf, size, error);
274 ProcessElfCore::DoReadMemory (lldb::addr_t addr, void *buf, size_t size, Error &error)
276 ObjectFile *core_objfile = m_core_module_sp->GetObjectFile();
278 if (core_objfile == NULL)
281 // Get the address range
282 const VMRangeToFileOffset::Entry *address_range = m_core_aranges.FindEntryThatContains (addr);
283 if (address_range == NULL || address_range->GetRangeEnd() < addr)
285 error.SetErrorStringWithFormat ("core file does not contain 0x%" PRIx64, addr);
289 // Convert the address into core file offset
290 const lldb::addr_t offset = addr - address_range->GetRangeBase();
291 const lldb::addr_t file_start = address_range->data.GetRangeBase();
292 const lldb::addr_t file_end = address_range->data.GetRangeEnd();
293 size_t bytes_to_read = size; // Number of bytes to read from the core file
294 size_t bytes_copied = 0; // Number of bytes actually read from the core file
295 size_t zero_fill_size = 0; // Padding
296 lldb::addr_t bytes_left = 0; // Number of bytes available in the core file from the given address
298 // Figure out how many on-disk bytes remain in this segment
299 // starting at the given offset
300 if (file_end > file_start + offset)
301 bytes_left = file_end - (file_start + offset);
303 // Figure out how many bytes we need to zero-fill if we are
304 // reading more bytes than available in the on-disk segment
305 if (bytes_to_read > bytes_left)
307 zero_fill_size = bytes_to_read - bytes_left;
308 bytes_to_read = bytes_left;
311 // If there is data available on the core file read it
313 bytes_copied = core_objfile->CopyData(offset + file_start, bytes_to_read, buf);
315 assert(zero_fill_size <= size);
316 // Pad remaining bytes
318 memset(((char *)buf) + bytes_copied, 0, zero_fill_size);
320 return bytes_copied + zero_fill_size;
324 ProcessElfCore::Clear()
326 m_thread_list.Clear();
330 ProcessElfCore::Initialize()
332 static bool g_initialized = false;
334 if (g_initialized == false)
336 g_initialized = true;
337 PluginManager::RegisterPlugin (GetPluginNameStatic(), GetPluginDescriptionStatic(), CreateInstance);
342 ProcessElfCore::GetImageInfoAddress()
344 Target *target = &GetTarget();
345 ObjectFile *obj_file = target->GetExecutableModule()->GetObjectFile();
346 Address addr = obj_file->GetImageInfoAddress(target);
349 return addr.GetLoadAddress(target);
350 return LLDB_INVALID_ADDRESS;
353 /// Core files PT_NOTE segment descriptor types
364 NT_FREEBSD_PRSTATUS = 1,
367 NT_FREEBSD_THRMISC = 7,
368 NT_FREEBSD_PROCSTAT_AUXV = 16
371 // Parse a FreeBSD NT_PRSTATUS note - see FreeBSD sys/procfs.h for details.
373 ParseFreeBSDPrStatus(ThreadData &thread_data, DataExtractor &data,
376 lldb::offset_t offset = 0;
377 bool lp64 = (arch.GetMachine() == llvm::Triple::mips64 ||
378 arch.GetMachine() == llvm::Triple::x86_64);
379 int pr_version = data.GetU32(&offset);
381 Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS));
385 log->Printf("FreeBSD PRSTATUS unexpected version %d", pr_version);
388 // Skip padding, pr_statussz, pr_gregsetsz, pr_fpregsetsz, pr_osreldate
394 thread_data.signo = data.GetU32(&offset); // pr_cursig
395 offset += 4; // pr_pid
399 size_t len = data.GetByteSize() - offset;
400 thread_data.gpregset = DataExtractor(data, offset, len);
404 ParseFreeBSDThrMisc(ThreadData &thread_data, DataExtractor &data)
406 lldb::offset_t offset = 0;
407 thread_data.name = data.GetCStr(&offset, 20);
410 /// Parse Thread context from PT_NOTE segment and store it in the thread list
412 /// 1) A PT_NOTE segment is composed of one or more NOTE entries.
413 /// 2) NOTE Entry contains a standard header followed by variable size data.
414 /// (see ELFNote structure)
415 /// 3) A Thread Context in a core file usually described by 3 NOTE entries.
416 /// a) NT_PRSTATUS - Register context
417 /// b) NT_PRPSINFO - Process info(pid..)
418 /// c) NT_FPREGSET - Floating point registers
419 /// 4) The NOTE entries can be in any order
420 /// 5) If a core file contains multiple thread contexts then there is two data forms
421 /// a) Each thread context(2 or more NOTE entries) contained in its own segment (PT_NOTE)
422 /// b) All thread context is stored in a single segment(PT_NOTE).
423 /// This case is little tricker since while parsing we have to find where the
424 /// new thread starts. The current implementation marks beginning of
425 /// new thread when it finds NT_PRSTATUS or NT_PRPSINFO NOTE entry.
426 /// For case (b) there may be either one NT_PRPSINFO per thread, or a single
427 /// one that applies to all threads (depending on the platform type).
429 ProcessElfCore::ParseThreadContextsFromNoteSegment(const elf::ELFProgramHeader *segment_header,
430 DataExtractor segment_data)
432 assert(segment_header && segment_header->p_type == llvm::ELF::PT_NOTE);
434 lldb::offset_t offset = 0;
435 std::unique_ptr<ThreadData> thread_data(new ThreadData);
436 bool have_prstatus = false;
437 bool have_prpsinfo = false;
439 ArchSpec arch = GetArchitecture();
440 ELFLinuxPrPsInfo prpsinfo;
441 ELFLinuxPrStatus prstatus;
445 // Loop through the NOTE entires in the segment
446 while (offset < segment_header->p_filesz)
448 ELFNote note = ELFNote();
449 note.Parse(segment_data, &offset);
451 // Beginning of new thread
452 if ((note.n_type == NT_PRSTATUS && have_prstatus) ||
453 (note.n_type == NT_PRPSINFO && have_prpsinfo))
455 assert(thread_data->gpregset.GetByteSize() > 0);
456 // Add the new thread to thread list
457 m_thread_data.push_back(*thread_data);
458 *thread_data = ThreadData();
459 have_prstatus = false;
460 have_prpsinfo = false;
463 size_t note_start, note_size;
465 note_size = llvm::RoundUpToAlignment(note.n_descsz, 4);
467 // Store the NOTE information in the current thread
468 DataExtractor note_data (segment_data, note_start, note_size);
469 if (note.n_name == "FreeBSD")
473 case NT_FREEBSD_PRSTATUS:
474 have_prstatus = true;
475 ParseFreeBSDPrStatus(*thread_data, note_data, arch);
477 case NT_FREEBSD_FPREGSET:
478 thread_data->fpregset = note_data;
480 case NT_FREEBSD_PRPSINFO:
481 have_prpsinfo = true;
483 case NT_FREEBSD_THRMISC:
484 ParseFreeBSDThrMisc(*thread_data, note_data);
486 case NT_FREEBSD_PROCSTAT_AUXV:
487 // FIXME: FreeBSD sticks an int at the beginning of the note
488 m_auxv = DataExtractor(segment_data, note_start + 4, note_size - 4);
499 have_prstatus = true;
500 prstatus.Parse(note_data, arch);
501 thread_data->signo = prstatus.pr_cursig;
502 header_size = ELFLinuxPrStatus::GetSize(arch);
503 len = note_data.GetByteSize() - header_size;
504 thread_data->gpregset = DataExtractor(note_data, header_size, len);
507 thread_data->fpregset = note_data;
510 have_prpsinfo = true;
511 prpsinfo.Parse(note_data, arch);
512 thread_data->name = prpsinfo.pr_fname;
515 m_auxv = DataExtractor(note_data);
524 // Add last entry in the note section
525 if (thread_data && thread_data->gpregset.GetByteSize() > 0)
527 m_thread_data.push_back(*thread_data);
532 ProcessElfCore::GetNumThreadContexts ()
534 if (!m_thread_data_valid)
536 return m_thread_data.size();
540 ProcessElfCore::GetArchitecture()
542 ObjectFileELF *core_file = (ObjectFileELF *)(m_core_module_sp->GetObjectFile());
544 core_file->GetArchitecture(arch);
548 const lldb::DataBufferSP
549 ProcessElfCore::GetAuxvData()
551 const uint8_t *start = m_auxv.GetDataStart();
552 size_t len = m_auxv.GetByteSize();
553 lldb::DataBufferSP buffer(new lldb_private::DataBufferHeap(start, len));