ProcessMachCore.cpp revision 5f35a4be95aed0e5b2cb36f7d785bcbfc67284ae
1//===-- ProcessMachCore.cpp ------------------------------------------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// C Includes 11#include <errno.h> 12#include <stdlib.h> 13 14// C++ Includes 15#include "llvm/Support/MachO.h" 16#include "llvm/Support/MathExtras.h" 17 18// Other libraries and framework includes 19#include "lldb/Core/Debugger.h" 20#include "lldb/Core/PluginManager.h" 21#include "lldb/Core/Module.h" 22#include "lldb/Core/ModuleSpec.h" 23#include "lldb/Core/Section.h" 24#include "lldb/Core/State.h" 25#include "lldb/Host/Host.h" 26#include "lldb/Symbol/ObjectFile.h" 27#include "lldb/Target/Target.h" 28#include "lldb/Target/Thread.h" 29 30// Project includes 31#include "ProcessMachCore.h" 32#include "ThreadMachCore.h" 33#include "StopInfoMachException.h" 34 35#include "Plugins/DynamicLoader/MacOSX-DYLD/DynamicLoaderMacOSXDYLD.h" 36#include "Plugins/DynamicLoader/Darwin-Kernel/DynamicLoaderDarwinKernel.h" 37 38using namespace lldb; 39using namespace lldb_private; 40 41const char * 42ProcessMachCore::GetPluginNameStatic() 43{ 44 return "mach-o-core"; 45} 46 47const char * 48ProcessMachCore::GetPluginDescriptionStatic() 49{ 50 return "Mach-O core file debugging plug-in."; 51} 52 53void 54ProcessMachCore::Terminate() 55{ 56 PluginManager::UnregisterPlugin (ProcessMachCore::CreateInstance); 57} 58 59 60lldb::ProcessSP 61ProcessMachCore::CreateInstance (Target &target, Listener &listener, const FileSpec *crash_file) 62{ 63 lldb::ProcessSP process_sp; 64 if (crash_file) 65 process_sp.reset(new ProcessMachCore (target, listener, *crash_file)); 66 return process_sp; 67} 68 69bool 70ProcessMachCore::CanDebug(Target &target, bool plugin_specified_by_name) 71{ 72 if (plugin_specified_by_name) 73 return true; 74 75 // For now we are just making sure the file exists for a given module 76 if (!m_core_module_sp && m_core_file.Exists()) 77 { 78 ModuleSpec core_module_spec(m_core_file, target.GetArchitecture()); 79 Error error (ModuleList::GetSharedModule (core_module_spec, 80 m_core_module_sp, 81 NULL, 82 NULL, 83 NULL)); 84 85 if (m_core_module_sp) 86 { 87 const llvm::Triple &triple_ref = m_core_module_sp->GetArchitecture().GetTriple(); 88 if (triple_ref.getVendor() == llvm::Triple::Apple) 89 { 90 ObjectFile *core_objfile = m_core_module_sp->GetObjectFile(); 91 if (core_objfile && core_objfile->GetType() == ObjectFile::eTypeCoreFile) 92 return true; 93 } 94 } 95 } 96 return false; 97} 98 99//---------------------------------------------------------------------- 100// ProcessMachCore constructor 101//---------------------------------------------------------------------- 102ProcessMachCore::ProcessMachCore(Target& target, Listener &listener, const FileSpec &core_file) : 103 Process (target, listener), 104 m_core_aranges (), 105 m_core_module_sp (), 106 m_core_file (core_file), 107 m_dyld_addr (LLDB_INVALID_ADDRESS), 108 m_dyld_plugin_name () 109{ 110} 111 112//---------------------------------------------------------------------- 113// Destructor 114//---------------------------------------------------------------------- 115ProcessMachCore::~ProcessMachCore() 116{ 117 Clear(); 118 // We need to call finalize on the process before destroying ourselves 119 // to make sure all of the broadcaster cleanup goes as planned. If we 120 // destruct this class, then Process::~Process() might have problems 121 // trying to fully destroy the broadcaster. 122 Finalize(); 123} 124 125//---------------------------------------------------------------------- 126// PluginInterface 127//---------------------------------------------------------------------- 128const char * 129ProcessMachCore::GetPluginName() 130{ 131 return "Process debugging plug-in that loads mach-o core files."; 132} 133 134const char * 135ProcessMachCore::GetShortPluginName() 136{ 137 return GetPluginNameStatic(); 138} 139 140uint32_t 141ProcessMachCore::GetPluginVersion() 142{ 143 return 1; 144} 145 146bool 147ProcessMachCore::GetDynamicLoaderAddress (lldb::addr_t addr) 148{ 149 llvm::MachO::mach_header header; 150 Error error; 151 if (DoReadMemory (addr, &header, sizeof(header), error) != sizeof(header)) 152 return false; 153 if (header.magic == llvm::MachO::HeaderMagic32Swapped || 154 header.magic == llvm::MachO::HeaderMagic64Swapped) 155 { 156 header.magic = llvm::ByteSwap_32(header.magic); 157 header.cputype = llvm::ByteSwap_32(header.cputype); 158 header.cpusubtype = llvm::ByteSwap_32(header.cpusubtype); 159 header.filetype = llvm::ByteSwap_32(header.filetype); 160 header.ncmds = llvm::ByteSwap_32(header.ncmds); 161 header.sizeofcmds = llvm::ByteSwap_32(header.sizeofcmds); 162 header.flags = llvm::ByteSwap_32(header.flags); 163 } 164 165 // TODO: swap header if needed... 166 //printf("0x%16.16" PRIx64 ": magic = 0x%8.8x, file_type= %u\n", vaddr, header.magic, header.filetype); 167 if (header.magic == llvm::MachO::HeaderMagic32 || 168 header.magic == llvm::MachO::HeaderMagic64) 169 { 170 // Check MH_EXECUTABLE to see if we can find the mach image 171 // that contains the shared library list. The dynamic loader 172 // (dyld) is what contains the list for user applications, 173 // and the mach kernel contains a global that has the list 174 // of kexts to load 175 switch (header.filetype) 176 { 177 case llvm::MachO::HeaderFileTypeDynamicLinkEditor: 178 //printf("0x%16.16" PRIx64 ": file_type = MH_DYLINKER\n", vaddr); 179 // Address of dyld "struct mach_header" in the core file 180 m_dyld_plugin_name = DynamicLoaderMacOSXDYLD::GetPluginNameStatic(); 181 m_dyld_addr = addr; 182 return true; 183 184 case llvm::MachO::HeaderFileTypeExecutable: 185 //printf("0x%16.16" PRIx64 ": file_type = MH_EXECUTE\n", vaddr); 186 // Check MH_EXECUTABLE file types to see if the dynamic link object flag 187 // is NOT set. If it isn't, then we have a mach_kernel. 188 if ((header.flags & llvm::MachO::HeaderFlagBitIsDynamicLinkObject) == 0) 189 { 190 m_dyld_plugin_name = DynamicLoaderDarwinKernel::GetPluginNameStatic(); 191 // Address of the mach kernel "struct mach_header" in the core file. 192 m_dyld_addr = addr; 193 return true; 194 } 195 break; 196 } 197 } 198 return false; 199} 200 201//---------------------------------------------------------------------- 202// Process Control 203//---------------------------------------------------------------------- 204Error 205ProcessMachCore::DoLoadCore () 206{ 207 Error error; 208 if (!m_core_module_sp) 209 { 210 error.SetErrorString ("invalid core module"); 211 return error; 212 } 213 214 ObjectFile *core_objfile = m_core_module_sp->GetObjectFile(); 215 if (core_objfile == NULL) 216 { 217 error.SetErrorString ("invalid core object file"); 218 return error; 219 } 220 SectionList *section_list = core_objfile->GetSectionList(); 221 if (section_list == NULL) 222 { 223 error.SetErrorString ("core file has no sections"); 224 return error; 225 } 226 227 const uint32_t num_sections = section_list->GetNumSections(0); 228 if (num_sections == 0) 229 { 230 error.SetErrorString ("core file has no sections"); 231 return error; 232 } 233 234 SetCanJIT(false); 235 236 llvm::MachO::mach_header header; 237 DataExtractor data (&header, 238 sizeof(header), 239 m_core_module_sp->GetArchitecture().GetByteOrder(), 240 m_core_module_sp->GetArchitecture().GetAddressByteSize()); 241 242 bool ranges_are_sorted = true; 243 addr_t vm_addr = 0; 244 for (uint32_t i=0; i<num_sections; ++i) 245 { 246 Section *section = section_list->GetSectionAtIndex (i).get(); 247 if (section) 248 { 249 lldb::addr_t section_vm_addr = section->GetFileAddress(); 250 FileRange file_range (section->GetFileOffset(), section->GetFileSize()); 251 VMRangeToFileOffset::Entry range_entry (section_vm_addr, 252 section->GetByteSize(), 253 file_range); 254 255 if (vm_addr > section_vm_addr) 256 ranges_are_sorted = false; 257 vm_addr = section->GetFileAddress(); 258 VMRangeToFileOffset::Entry *last_entry = m_core_aranges.Back(); 259// printf ("LC_SEGMENT[%u] arange=[0x%16.16" PRIx64 " - 0x%16.16" PRIx64 "), frange=[0x%8.8x - 0x%8.8x)\n", 260// i, 261// range_entry.GetRangeBase(), 262// range_entry.GetRangeEnd(), 263// range_entry.data.GetRangeBase(), 264// range_entry.data.GetRangeEnd()); 265 266 if (last_entry && 267 last_entry->GetRangeEnd() == range_entry.GetRangeBase() && 268 last_entry->data.GetRangeEnd() == range_entry.data.GetRangeBase()) 269 { 270 last_entry->SetRangeEnd (range_entry.GetRangeEnd()); 271 last_entry->data.SetRangeEnd (range_entry.data.GetRangeEnd()); 272 //puts("combine"); 273 } 274 else 275 { 276 m_core_aranges.Append(range_entry); 277 } 278 279 // After we have added this section to our m_core_aranges map, 280 // we can check the start of the section to see if it might 281 // contain dyld for user space apps, or the mach kernel file 282 // for kernel cores. 283 if (m_dyld_addr == LLDB_INVALID_ADDRESS) 284 GetDynamicLoaderAddress (section_vm_addr); 285 } 286 } 287 if (!ranges_are_sorted) 288 { 289 m_core_aranges.Sort(); 290 } 291 292 // Even if the architecture is set in the target, we need to override 293 // it to match the core file which is always single arch. 294 ArchSpec arch (m_core_module_sp->GetArchitecture()); 295 if (arch.GetCore() == ArchSpec::eCore_x86_32_i486) 296 { 297 arch.SetTriple ("i386", m_target.GetPlatform().get()); 298 } 299 if (arch.IsValid()) 300 m_target.SetArchitecture(arch); 301 302 if (m_dyld_addr == LLDB_INVALID_ADDRESS) 303 { 304 // Check the magic kernel address for the mach image header address in case 305 // it is there. 306 if (arch.GetAddressByteSize() == 8) 307 { 308 Error header_addr_error; 309 addr_t header_addr = ReadPointerFromMemory (0xffffff8000002010ull, header_addr_error); 310 if (header_addr != LLDB_INVALID_ADDRESS) 311 GetDynamicLoaderAddress (header_addr); 312 } 313 else 314 { 315 Error header_addr_error; 316 addr_t header_addr = ReadPointerFromMemory (0xffff0110, header_addr_error); 317 if (header_addr != LLDB_INVALID_ADDRESS) 318 GetDynamicLoaderAddress (header_addr); 319 } 320 } 321 322 return error; 323} 324 325lldb_private::DynamicLoader * 326ProcessMachCore::GetDynamicLoader () 327{ 328 if (m_dyld_ap.get() == NULL) 329 m_dyld_ap.reset (DynamicLoader::FindPlugin(this, m_dyld_plugin_name.empty() ? NULL : m_dyld_plugin_name.c_str())); 330 return m_dyld_ap.get(); 331} 332 333bool 334ProcessMachCore::UpdateThreadList (ThreadList &old_thread_list, ThreadList &new_thread_list) 335{ 336 if (old_thread_list.GetSize(false) == 0) 337 { 338 // Make up the thread the first time this is called so we can setup our one and only 339 // core thread state. 340 ObjectFile *core_objfile = m_core_module_sp->GetObjectFile(); 341 342 if (core_objfile) 343 { 344 const uint32_t num_threads = core_objfile->GetNumThreadContexts (); 345 for (lldb::tid_t tid = 0; tid < num_threads; ++tid) 346 { 347 ThreadSP thread_sp(new ThreadMachCore (*this, tid)); 348 new_thread_list.AddThread (thread_sp); 349 } 350 } 351 } 352 else 353 { 354 const uint32_t num_threads = old_thread_list.GetSize(false); 355 for (uint32_t i=0; i<num_threads; ++i) 356 new_thread_list.AddThread (old_thread_list.GetThreadAtIndex (i)); 357 } 358 return new_thread_list.GetSize(false) > 0; 359} 360 361void 362ProcessMachCore::RefreshStateAfterStop () 363{ 364 // Let all threads recover from stopping and do any clean up based 365 // on the previous thread state (if any). 366 m_thread_list.RefreshStateAfterStop(); 367 //SetThreadStopInfo (m_last_stop_packet); 368} 369 370Error 371ProcessMachCore::DoDestroy () 372{ 373 return Error(); 374} 375 376//------------------------------------------------------------------ 377// Process Queries 378//------------------------------------------------------------------ 379 380bool 381ProcessMachCore::IsAlive () 382{ 383 return true; 384} 385 386//------------------------------------------------------------------ 387// Process Memory 388//------------------------------------------------------------------ 389size_t 390ProcessMachCore::ReadMemory (addr_t addr, void *buf, size_t size, Error &error) 391{ 392 // Don't allow the caching that lldb_private::Process::ReadMemory does 393 // since in core files we have it all cached our our core file anyway. 394 return DoReadMemory (addr, buf, size, error); 395} 396 397size_t 398ProcessMachCore::DoReadMemory (addr_t addr, void *buf, size_t size, Error &error) 399{ 400 ObjectFile *core_objfile = m_core_module_sp->GetObjectFile(); 401 402 if (core_objfile) 403 { 404 const VMRangeToFileOffset::Entry *core_memory_entry = m_core_aranges.FindEntryThatContains (addr); 405 if (core_memory_entry) 406 { 407 const addr_t offset = addr - core_memory_entry->GetRangeBase(); 408 const addr_t bytes_left = core_memory_entry->GetRangeEnd() - addr; 409 size_t bytes_to_read = size; 410 if (bytes_to_read > bytes_left) 411 bytes_to_read = bytes_left; 412 return core_objfile->CopyData (core_memory_entry->data.GetRangeBase() + offset, bytes_to_read, buf); 413 } 414 else 415 { 416 error.SetErrorStringWithFormat ("core file does not contain 0x%" PRIx64, addr); 417 } 418 } 419 return 0; 420} 421 422void 423ProcessMachCore::Clear() 424{ 425 m_thread_list.Clear(); 426} 427 428void 429ProcessMachCore::Initialize() 430{ 431 static bool g_initialized = false; 432 433 if (g_initialized == false) 434 { 435 g_initialized = true; 436 PluginManager::RegisterPlugin (GetPluginNameStatic(), 437 GetPluginDescriptionStatic(), 438 CreateInstance); 439 } 440} 441 442addr_t 443ProcessMachCore::GetImageInfoAddress() 444{ 445 return m_dyld_addr; 446} 447 448 449lldb_private::ObjectFile * 450ProcessMachCore::GetCoreObjectFile () 451{ 452 return m_core_module_sp->GetObjectFile(); 453} 454