1//===-- DynamicLoaderFreeBSDKernel.cpp 2//------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#include "lldb/Breakpoint/StoppointCallbackContext.h" 11#include "lldb/Core/Debugger.h" 12#include "lldb/Core/Module.h" 13#include "lldb/Core/ModuleSpec.h" 14#include "lldb/Core/PluginManager.h" 15#include "lldb/Core/Section.h" 16#include "lldb/Host/StreamFile.h" 17#include "lldb/Interpreter/OptionValueProperties.h" 18#include "lldb/Symbol/ObjectFile.h" 19#include "lldb/Target/OperatingSystem.h" 20#include "lldb/Target/RegisterContext.h" 21#include "lldb/Target/StackFrame.h" 22#include "lldb/Target/Target.h" 23#include "lldb/Target/Thread.h" 24#include "lldb/Target/ThreadPlanRunToAddress.h" 25#include "lldb/Utility/DataBuffer.h" 26#include "lldb/Utility/DataBufferHeap.h" 27#include "lldb/Utility/LLDBLog.h" 28#include "lldb/Utility/Log.h" 29#include "lldb/Utility/State.h" 30 31#include "Plugins/ObjectFile/ELF/ObjectFileELF.h" 32 33#include "DynamicLoaderFreeBSDKernel.h" 34#include <memory> 35#include <mutex> 36 37using namespace lldb; 38using namespace lldb_private; 39 40LLDB_PLUGIN_DEFINE(DynamicLoaderFreeBSDKernel) 41 42void DynamicLoaderFreeBSDKernel::Initialize() { 43 PluginManager::RegisterPlugin(GetPluginNameStatic(), 44 GetPluginDescriptionStatic(), CreateInstance, 45 DebuggerInit); 46} 47 48void DynamicLoaderFreeBSDKernel::Terminate() { 49 PluginManager::UnregisterPlugin(CreateInstance); 50} 51 52llvm::StringRef DynamicLoaderFreeBSDKernel::GetPluginDescriptionStatic() { 53 return "The Dynamic Loader Plugin For FreeBSD Kernel"; 54} 55 56static bool is_kernel(Module *module) { 57 if (!module) 58 return false; 59 60 ObjectFile *objfile = module->GetObjectFile(); 61 if (!objfile) 62 return false; 63 if (objfile->GetType() != ObjectFile::eTypeExecutable) 64 return false; 65 if (objfile->GetStrata() != ObjectFile::eStrataUnknown && 66 objfile->GetStrata() != ObjectFile::eStrataKernel) 67 return false; 68 69 return true; 70} 71 72static bool is_kmod(Module *module) { 73 if (!module) 74 return false; 75 if (!module->GetObjectFile()) 76 return false; 77 ObjectFile *objfile = module->GetObjectFile(); 78 if (objfile->GetType() != ObjectFile::eTypeObjectFile && 79 objfile->GetType() != ObjectFile::eTypeSharedLibrary) 80 return false; 81 82 return true; 83} 84 85static bool is_reloc(Module *module) { 86 if (!module) 87 return false; 88 if (!module->GetObjectFile()) 89 return false; 90 ObjectFile *objfile = module->GetObjectFile(); 91 if (objfile->GetType() != ObjectFile::eTypeObjectFile) 92 return false; 93 94 return true; 95} 96 97// Instantiate Function of the FreeBSD Kernel Dynamic Loader Plugin called when 98// Register the Plugin 99DynamicLoader * 100DynamicLoaderFreeBSDKernel::CreateInstance(lldb_private::Process *process, 101 bool force) { 102 // Check the environment when the plugin is not force loaded 103 Module *exec = process->GetTarget().GetExecutableModulePointer(); 104 if (exec && !is_kernel(exec)) { 105 return nullptr; 106 } 107 if (!force) { 108 // Check if the target is kernel 109 const llvm::Triple &triple_ref = 110 process->GetTarget().GetArchitecture().GetTriple(); 111 if (!triple_ref.isOSFreeBSD()) { 112 return nullptr; 113 } 114 } 115 116 // At this point we have checked the target is a FreeBSD kernel and all we 117 // have to do is to find the kernel address 118 const addr_t kernel_address = FindFreeBSDKernel(process); 119 120 if (CheckForKernelImageAtAddress(process, kernel_address).IsValid()) 121 return new DynamicLoaderFreeBSDKernel(process, kernel_address); 122 123 return nullptr; 124} 125 126addr_t 127DynamicLoaderFreeBSDKernel::FindFreeBSDKernel(lldb_private::Process *process) { 128 addr_t kernel_addr = process->GetImageInfoAddress(); 129 if (kernel_addr == LLDB_INVALID_ADDRESS) 130 kernel_addr = FindKernelAtLoadAddress(process); 131 return kernel_addr; 132} 133 134// Get the kernel address if the kernel is not loaded with a slide 135addr_t DynamicLoaderFreeBSDKernel::FindKernelAtLoadAddress( 136 lldb_private::Process *process) { 137 Module *exe_module = process->GetTarget().GetExecutableModulePointer(); 138 139 if (!is_kernel(exe_module)) 140 return LLDB_INVALID_ADDRESS; 141 142 ObjectFile *exe_objfile = exe_module->GetObjectFile(); 143 144 if (!exe_objfile->GetBaseAddress().IsValid()) 145 return LLDB_INVALID_ADDRESS; 146 147 if (CheckForKernelImageAtAddress( 148 process, exe_objfile->GetBaseAddress().GetFileAddress()) 149 .IsValid()) 150 return exe_objfile->GetBaseAddress().GetFileAddress(); 151 152 return LLDB_INVALID_ADDRESS; 153} 154 155// Read ELF header from memry and return 156bool DynamicLoaderFreeBSDKernel::ReadELFHeader(Process *process, 157 lldb::addr_t addr, 158 llvm::ELF::Elf32_Ehdr &header, 159 bool *read_error) { 160 Status error; 161 if (read_error) 162 *read_error = false; 163 164 if (process->ReadMemory(addr, &header, sizeof(header), error) != 165 sizeof(header)) { 166 if (read_error) 167 *read_error = true; 168 return false; 169 } 170 171 if (!header.checkMagic()) 172 return false; 173 174 return true; 175} 176 177// Check the correctness of Kernel and return UUID 178lldb_private::UUID DynamicLoaderFreeBSDKernel::CheckForKernelImageAtAddress( 179 Process *process, lldb::addr_t addr, bool *read_error) { 180 Log *log = GetLog(LLDBLog::DynamicLoader); 181 182 if (addr == LLDB_INVALID_ADDRESS) { 183 if (read_error) 184 *read_error = true; 185 return UUID(); 186 } 187 188 LLDB_LOGF(log, 189 "DynamicLoaderFreeBSDKernel::CheckForKernelImageAtAddress: " 190 "looking for kernel binary at 0x%" PRIx64, 191 addr); 192 193 llvm::ELF::Elf32_Ehdr header; 194 if (!ReadELFHeader(process, addr, header)) { 195 *read_error = true; 196 return UUID(); 197 } 198 199 // Check header type 200 if (header.e_type != llvm::ELF::ET_EXEC) 201 return UUID(); 202 203 ModuleSP memory_module_sp = 204 process->ReadModuleFromMemory(FileSpec("temp_freebsd_kernel"), addr); 205 206 if (!memory_module_sp.get()) { 207 *read_error = true; 208 return UUID(); 209 } 210 211 ObjectFile *exe_objfile = memory_module_sp->GetObjectFile(); 212 if (exe_objfile == nullptr) { 213 LLDB_LOGF(log, 214 "DynamicLoaderFreeBSDKernel::CheckForKernelImageAtAddress " 215 "found a binary at 0x%" PRIx64 216 " but could not create an object file from memory", 217 addr); 218 return UUID(); 219 } 220 221 // In here, I should check is_kernel for memory_module_sp 222 // However, the ReadModuleFromMemory reads wrong section so that this check 223 // will failed 224 ArchSpec kernel_arch(llvm::ELF::convertEMachineToArchName(header.e_machine)); 225 226 if (!process->GetTarget().GetArchitecture().IsCompatibleMatch(kernel_arch)) 227 process->GetTarget().SetArchitecture(kernel_arch); 228 229 std::string uuid_str; 230 if (memory_module_sp->GetUUID().IsValid()) { 231 uuid_str = "with UUID "; 232 uuid_str += memory_module_sp->GetUUID().GetAsString(); 233 } else { 234 uuid_str = "and no LC_UUID found in load commands "; 235 } 236 LLDB_LOGF(log, 237 "DynamicLoaderFreeBSDKernel::CheckForKernelImageAtAddress: " 238 "kernel binary image found at 0x%" PRIx64 " with arch '%s' %s", 239 addr, kernel_arch.GetTriple().str().c_str(), uuid_str.c_str()); 240 241 return memory_module_sp->GetUUID(); 242} 243 244void DynamicLoaderFreeBSDKernel::DebuggerInit( 245 lldb_private::Debugger &debugger) {} 246 247DynamicLoaderFreeBSDKernel::DynamicLoaderFreeBSDKernel(Process *process, 248 addr_t kernel_address) 249 : DynamicLoader(process), m_process(process), 250 m_linker_file_list_struct_addr(LLDB_INVALID_ADDRESS), 251 m_linker_file_head_addr(LLDB_INVALID_ADDRESS), 252 m_kernel_load_address(kernel_address), m_mutex() { 253 process->SetCanRunCode(false); 254} 255 256DynamicLoaderFreeBSDKernel::~DynamicLoaderFreeBSDKernel() { Clear(true); } 257 258void DynamicLoaderFreeBSDKernel::Update() { 259 LoadKernelModules(); 260 SetNotificationBreakPoint(); 261} 262 263// Create in memory Module at the load address 264bool DynamicLoaderFreeBSDKernel::KModImageInfo::ReadMemoryModule( 265 lldb_private::Process *process) { 266 Log *log = GetLog(LLDBLog::DynamicLoader); 267 if (m_memory_module_sp) 268 return true; 269 if (m_load_address == LLDB_INVALID_ADDRESS) 270 return false; 271 272 FileSpec file_spec(m_name); 273 274 ModuleSP memory_module_sp; 275 276 llvm::ELF::Elf32_Ehdr elf_eheader; 277 size_t size_to_read = 512; 278 279 if (ReadELFHeader(process, m_load_address, elf_eheader)) { 280 if (elf_eheader.e_ident[llvm::ELF::EI_CLASS] == llvm::ELF::ELFCLASS32) { 281 size_to_read = sizeof(llvm::ELF::Elf32_Ehdr) + 282 elf_eheader.e_phnum * elf_eheader.e_phentsize; 283 } else if (elf_eheader.e_ident[llvm::ELF::EI_CLASS] == 284 llvm::ELF::ELFCLASS64) { 285 llvm::ELF::Elf64_Ehdr elf_eheader; 286 Status error; 287 if (process->ReadMemory(m_load_address, &elf_eheader, sizeof(elf_eheader), 288 error) == sizeof(elf_eheader)) 289 size_to_read = sizeof(llvm::ELF::Elf64_Ehdr) + 290 elf_eheader.e_phnum * elf_eheader.e_phentsize; 291 } 292 } 293 294 memory_module_sp = 295 process->ReadModuleFromMemory(file_spec, m_load_address, size_to_read); 296 297 if (!memory_module_sp) 298 return false; 299 300 bool this_is_kernel = is_kernel(memory_module_sp.get()); 301 302 if (!m_uuid.IsValid() && memory_module_sp->GetUUID().IsValid()) 303 m_uuid = memory_module_sp->GetUUID(); 304 305 m_memory_module_sp = memory_module_sp; 306 m_is_kernel = this_is_kernel; 307 308 // The kernel binary is from memory 309 if (this_is_kernel) { 310 LLDB_LOGF(log, "KextImageInfo::ReadMemoryModule read the kernel binary out " 311 "of memory"); 312 313 if (memory_module_sp->GetArchitecture().IsValid()) 314 process->GetTarget().SetArchitecture(memory_module_sp->GetArchitecture()); 315 } 316 317 return true; 318} 319 320bool DynamicLoaderFreeBSDKernel::KModImageInfo::LoadImageUsingMemoryModule( 321 lldb_private::Process *process) { 322 Log *log = GetLog(LLDBLog::DynamicLoader); 323 324 if (IsLoaded()) 325 return true; 326 327 Target &target = process->GetTarget(); 328 329 if (IsKernel() && m_uuid.IsValid()) { 330 Stream &s = target.GetDebugger().GetOutputStream(); 331 s.Printf("Kernel UUID: %s\n", m_uuid.GetAsString().c_str()); 332 s.Printf("Load Address: 0x%" PRIx64 "\n", m_load_address); 333 } 334 335 // Test if the module is loaded into the taget, 336 // maybe the module is loaded manually by user by doing target module add 337 // So that we have to create the module manually 338 if (!m_module_sp) { 339 const ModuleList &target_images = target.GetImages(); 340 m_module_sp = target_images.FindModule(m_uuid); 341 342 // Search in the file system 343 if (!m_module_sp) { 344 ModuleSpec module_spec(FileSpec(GetPath()), target.GetArchitecture()); 345 if (IsKernel()) { 346 Status error; 347 if (PluginManager::DownloadObjectAndSymbolFile(module_spec, error, 348 true)) { 349 if (FileSystem::Instance().Exists(module_spec.GetFileSpec())) 350 m_module_sp = std::make_shared<Module>(module_spec.GetFileSpec(), 351 target.GetArchitecture()); 352 } 353 } 354 355 if (!m_module_sp) 356 m_module_sp = target.GetOrCreateModule(module_spec, true); 357 if (IsKernel() && !m_module_sp) { 358 Stream &s = target.GetDebugger().GetOutputStream(); 359 s.Printf("WARNING: Unable to locate kernel binary on the debugger " 360 "system.\n"); 361 } 362 } 363 364 if (m_module_sp) { 365 // If the file is not kernel or kmod, the target should be loaded once and 366 // don't reload again 367 if (!IsKernel() && !is_kmod(m_module_sp.get())) { 368 ModuleSP existing_module_sp = target.GetImages().FindModule(m_uuid); 369 if (existing_module_sp && 370 existing_module_sp->IsLoadedInTarget(&target)) { 371 LLDB_LOGF(log, 372 "'%s' with UUID %s is not a kmod or kernel, and is " 373 "already registered in target, not loading.", 374 m_name.c_str(), m_uuid.GetAsString().c_str()); 375 return true; 376 } 377 } 378 m_uuid = m_module_sp->GetUUID(); 379 380 // or append to the images 381 target.GetImages().AppendIfNeeded(m_module_sp, false); 382 } 383 } 384 385 // If this file is relocatable kernel module(x86_64), adjust it's 386 // section(PT_LOAD segment) and return Because the kernel module's load 387 // address is the text section. lldb cannot create full memory module upon 388 // relocatable file So what we do is to set the load address only. 389 if (is_kmod(m_module_sp.get()) && is_reloc(m_module_sp.get())) { 390 m_stop_id = process->GetStopID(); 391 bool changed = false; 392 m_module_sp->SetLoadAddress(target, m_load_address, true, changed); 393 return true; 394 } 395 396 if (m_module_sp) 397 ReadMemoryModule(process); 398 399 // Calculate the slides of in memory module 400 if (!m_memory_module_sp || !m_module_sp) { 401 m_module_sp.reset(); 402 return false; 403 } 404 405 ObjectFile *ondisk_object_file = m_module_sp->GetObjectFile(); 406 ObjectFile *memory_object_file = m_memory_module_sp->GetObjectFile(); 407 408 if (!ondisk_object_file || !memory_object_file) 409 m_module_sp.reset(); 410 411 // Find the slide address 412 addr_t fixed_slide = LLDB_INVALID_ADDRESS; 413 if (ObjectFileELF *memory_objfile_elf = 414 llvm::dyn_cast<ObjectFileELF>(memory_object_file)) { 415 addr_t load_address = memory_object_file->GetBaseAddress().GetFileAddress(); 416 417 if (load_address != LLDB_INVALID_ADDRESS && 418 m_load_address != load_address) { 419 fixed_slide = m_load_address - load_address; 420 LLDB_LOGF(log, 421 "kmod %s in-memory LOAD vmaddr is not correct, using a " 422 "fixed slide of 0x%" PRIx64, 423 m_name.c_str(), fixed_slide); 424 } 425 } 426 427 SectionList *ondisk_section_list = ondisk_object_file->GetSectionList(); 428 SectionList *memory_section_list = memory_object_file->GetSectionList(); 429 430 if (memory_section_list && ondisk_object_file) { 431 const uint32_t num_ondisk_sections = ondisk_section_list->GetSize(); 432 uint32_t num_load_sections = 0; 433 434 for (uint32_t section_idx = 0; section_idx < num_ondisk_sections; 435 ++section_idx) { 436 SectionSP on_disk_section_sp = 437 ondisk_section_list->GetSectionAtIndex(section_idx); 438 439 if (!on_disk_section_sp) 440 continue; 441 if (fixed_slide != LLDB_INVALID_ADDRESS) { 442 target.SetSectionLoadAddress(on_disk_section_sp, 443 on_disk_section_sp->GetFileAddress() + 444 fixed_slide); 445 446 } else { 447 const Section *memory_section = 448 memory_section_list 449 ->FindSectionByName(on_disk_section_sp->GetName()) 450 .get(); 451 if (memory_section) { 452 target.SetSectionLoadAddress(on_disk_section_sp, 453 memory_section->GetFileAddress()); 454 ++num_load_sections; 455 } 456 } 457 } 458 459 if (num_load_sections) 460 m_stop_id = process->GetStopID(); 461 else 462 m_module_sp.reset(); 463 } else { 464 m_module_sp.reset(); 465 } 466 467 if (IsLoaded() && m_module_sp && IsKernel()) { 468 Stream &s = target.GetDebugger().GetOutputStream(); 469 ObjectFile *kernel_object_file = m_module_sp->GetObjectFile(); 470 if (kernel_object_file) { 471 addr_t file_address = 472 kernel_object_file->GetBaseAddress().GetFileAddress(); 473 if (m_load_address != LLDB_INVALID_ADDRESS && 474 file_address != LLDB_INVALID_ADDRESS) { 475 s.Printf("Kernel slide 0x%" PRIx64 " in memory.\n", 476 m_load_address - file_address); 477 s.Printf("Loaded kernel file %s\n", 478 m_module_sp->GetFileSpec().GetPath().c_str()); 479 } 480 } 481 s.Flush(); 482 } 483 484 return IsLoaded(); 485} 486 487// This function is work for kernel file, others it wil reset load address and 488// return false 489bool DynamicLoaderFreeBSDKernel::KModImageInfo::LoadImageUsingFileAddress( 490 lldb_private::Process *process) { 491 if (IsLoaded()) 492 return true; 493 494 if (m_module_sp) { 495 bool changed = false; 496 if (m_module_sp->SetLoadAddress(process->GetTarget(), 0, true, changed)) 497 m_stop_id = process->GetStopID(); 498 } 499 500 return false; 501} 502 503// Get the head of found_list 504bool DynamicLoaderFreeBSDKernel::ReadKmodsListHeader() { 505 std::lock_guard<decltype(m_mutex)> guard(m_mutex); 506 507 if (m_linker_file_list_struct_addr.IsValid()) { 508 // Get tqh_first struct element from linker_files 509 Status error; 510 addr_t address = m_process->ReadPointerFromMemory( 511 m_linker_file_list_struct_addr.GetLoadAddress(&m_process->GetTarget()), 512 error); 513 if (address != LLDB_INVALID_ADDRESS && error.Success()) { 514 m_linker_file_head_addr = Address(address); 515 } else { 516 m_linker_file_list_struct_addr.Clear(); 517 return false; 518 } 519 520 if (!m_linker_file_head_addr.IsValid() || 521 m_linker_file_head_addr.GetFileAddress() == 0) { 522 m_linker_file_list_struct_addr.Clear(); 523 return false; 524 } 525 } 526 return true; 527} 528 529// Parse Kmod info in found_list 530bool DynamicLoaderFreeBSDKernel::ParseKmods(Address linker_files_head_addr) { 531 std::lock_guard<decltype(m_mutex)> guard(m_mutex); 532 KModImageInfo::collection_type linker_files_list; 533 Log *log = GetLog(LLDBLog::DynamicLoader); 534 535 if (!ReadAllKmods(linker_files_head_addr, linker_files_list)) 536 return false; 537 LLDB_LOGF( 538 log, 539 "Kmod-changed breakpoint hit, there are %zu kernel modules currently.\n", 540 linker_files_list.size()); 541 542 ModuleList &modules = m_process->GetTarget().GetImages(); 543 ModuleList remove_modules; 544 ModuleList add_modules; 545 546 for (ModuleSP module : modules.Modules()) { 547 if (is_kernel(module.get())) 548 continue; 549 if (is_kmod(module.get())) 550 remove_modules.AppendIfNeeded(module); 551 } 552 553 m_process->GetTarget().ModulesDidUnload(remove_modules, false); 554 555 for (KModImageInfo &image_info : linker_files_list) { 556 if (m_kld_name_to_uuid.find(image_info.GetName()) != 557 m_kld_name_to_uuid.end()) 558 image_info.SetUUID(m_kld_name_to_uuid[image_info.GetName()]); 559 bool failed_to_load = false; 560 if (!image_info.LoadImageUsingMemoryModule(m_process)) { 561 image_info.LoadImageUsingFileAddress(m_process); 562 failed_to_load = true; 563 } else { 564 m_linker_files_list.push_back(image_info); 565 m_kld_name_to_uuid[image_info.GetName()] = image_info.GetUUID(); 566 } 567 568 if (!failed_to_load) 569 add_modules.AppendIfNeeded(image_info.GetModule()); 570 } 571 m_process->GetTarget().ModulesDidLoad(add_modules); 572 return true; 573} 574 575// Read all kmod from a given arrays of list 576bool DynamicLoaderFreeBSDKernel::ReadAllKmods( 577 Address linker_files_head_addr, 578 KModImageInfo::collection_type &kmods_list) { 579 580 // Get offset of next member and load address symbol 581 static ConstString kld_off_address_symbol_name("kld_off_address"); 582 static ConstString kld_off_next_symbol_name("kld_off_next"); 583 static ConstString kld_off_filename_symbol_name("kld_off_filename"); 584 static ConstString kld_off_pathname_symbol_name("kld_off_pathname"); 585 const Symbol *kld_off_address_symbol = 586 m_kernel_image_info.GetModule()->FindFirstSymbolWithNameAndType( 587 kld_off_address_symbol_name, eSymbolTypeData); 588 const Symbol *kld_off_next_symbol = 589 m_kernel_image_info.GetModule()->FindFirstSymbolWithNameAndType( 590 kld_off_next_symbol_name, eSymbolTypeData); 591 const Symbol *kld_off_filename_symbol = 592 m_kernel_image_info.GetModule()->FindFirstSymbolWithNameAndType( 593 kld_off_filename_symbol_name, eSymbolTypeData); 594 const Symbol *kld_off_pathname_symbol = 595 m_kernel_image_info.GetModule()->FindFirstSymbolWithNameAndType( 596 kld_off_pathname_symbol_name, eSymbolTypeData); 597 598 if (!kld_off_address_symbol || !kld_off_next_symbol || 599 !kld_off_filename_symbol || !kld_off_pathname_symbol) 600 return false; 601 602 Status error; 603 const int32_t kld_off_address = m_process->ReadSignedIntegerFromMemory( 604 kld_off_address_symbol->GetAddress().GetLoadAddress( 605 &m_process->GetTarget()), 606 4, 0, error); 607 if (error.Fail()) 608 return false; 609 const int32_t kld_off_next = m_process->ReadSignedIntegerFromMemory( 610 kld_off_next_symbol->GetAddress().GetLoadAddress(&m_process->GetTarget()), 611 4, 0, error); 612 if (error.Fail()) 613 return false; 614 const int32_t kld_off_filename = m_process->ReadSignedIntegerFromMemory( 615 kld_off_filename_symbol->GetAddress().GetLoadAddress( 616 &m_process->GetTarget()), 617 4, 0, error); 618 if (error.Fail()) 619 return false; 620 621 const int32_t kld_off_pathname = m_process->ReadSignedIntegerFromMemory( 622 kld_off_pathname_symbol->GetAddress().GetLoadAddress( 623 &m_process->GetTarget()), 624 4, 0, error); 625 if (error.Fail()) 626 return false; 627 628 // Parse KMods 629 addr_t kld_load_addr(LLDB_INVALID_ADDRESS); 630 char kld_filename[255]; 631 char kld_pathname[255]; 632 addr_t current_kld = 633 linker_files_head_addr.GetLoadAddress(&m_process->GetTarget()); 634 635 while (current_kld != 0) { 636 addr_t kld_filename_addr = 637 m_process->ReadPointerFromMemory(current_kld + kld_off_filename, error); 638 if (error.Fail()) 639 return false; 640 addr_t kld_pathname_addr = 641 m_process->ReadPointerFromMemory(current_kld + kld_off_pathname, error); 642 if (error.Fail()) 643 return false; 644 645 m_process->ReadCStringFromMemory(kld_filename_addr, kld_filename, 646 sizeof(kld_filename), error); 647 if (error.Fail()) 648 return false; 649 m_process->ReadCStringFromMemory(kld_pathname_addr, kld_pathname, 650 sizeof(kld_pathname), error); 651 if (error.Fail()) 652 return false; 653 kld_load_addr = 654 m_process->ReadPointerFromMemory(current_kld + kld_off_address, error); 655 if (error.Fail()) 656 return false; 657 658 kmods_list.emplace_back(); 659 KModImageInfo &kmod_info = kmods_list.back(); 660 kmod_info.SetName(kld_filename); 661 kmod_info.SetLoadAddress(kld_load_addr); 662 kmod_info.SetPath(kld_pathname); 663 664 current_kld = 665 m_process->ReadPointerFromMemory(current_kld + kld_off_next, error); 666 if (kmod_info.GetName() == "kernel") 667 kmods_list.pop_back(); 668 if (error.Fail()) 669 return false; 670 } 671 672 return true; 673} 674 675// Read all kmods 676void DynamicLoaderFreeBSDKernel::ReadAllKmods() { 677 std::lock_guard<decltype(m_mutex)> guard(m_mutex); 678 679 if (ReadKmodsListHeader()) { 680 if (m_linker_file_head_addr.IsValid()) { 681 if (!ParseKmods(m_linker_file_head_addr)) 682 m_linker_files_list.clear(); 683 } 684 } 685} 686 687// Load all Kernel Modules 688void DynamicLoaderFreeBSDKernel::LoadKernelModules() { 689 Log *log = GetLog(LLDBLog::DynamicLoader); 690 LLDB_LOGF(log, "DynamicLoaderFreeBSDKernel::LoadKernelModules " 691 "Start loading Kernel Module"); 692 693 // Initialize Kernel Image Information at the first time 694 if (m_kernel_image_info.GetLoadAddress() == LLDB_INVALID_ADDRESS) { 695 ModuleSP module_sp = m_process->GetTarget().GetExecutableModule(); 696 if (is_kernel(module_sp.get())) { 697 m_kernel_image_info.SetModule(module_sp); 698 m_kernel_image_info.SetIsKernel(true); 699 } 700 701 // Set name for kernel 702 llvm::StringRef kernel_name("freebsd_kernel"); 703 module_sp = m_kernel_image_info.GetModule(); 704 if (module_sp.get() && module_sp->GetObjectFile() && 705 !module_sp->GetObjectFile()->GetFileSpec().GetFilename().IsEmpty()) 706 kernel_name = module_sp->GetObjectFile() 707 ->GetFileSpec() 708 .GetFilename() 709 .GetStringRef(); 710 m_kernel_image_info.SetName(kernel_name.data()); 711 712 if (m_kernel_image_info.GetLoadAddress() == LLDB_INVALID_ADDRESS) { 713 m_kernel_image_info.SetLoadAddress(m_kernel_load_address); 714 } 715 716 // Build In memory Module 717 if (m_kernel_image_info.GetLoadAddress() != LLDB_INVALID_ADDRESS) { 718 // If the kernel is not loaded in the memory, use file to load 719 if (!m_kernel_image_info.LoadImageUsingMemoryModule(m_process)) 720 m_kernel_image_info.LoadImageUsingFileAddress(m_process); 721 } 722 } 723 724 LoadOperatingSystemPlugin(false); 725 726 if (!m_kernel_image_info.IsLoaded() || !m_kernel_image_info.GetModule()) { 727 m_kernel_image_info.Clear(); 728 return; 729 } 730 731 static ConstString modlist_symbol_name("linker_files"); 732 733 const Symbol *symbol = 734 m_kernel_image_info.GetModule()->FindFirstSymbolWithNameAndType( 735 modlist_symbol_name, lldb::eSymbolTypeData); 736 737 if (symbol) { 738 m_linker_file_list_struct_addr = symbol->GetAddress(); 739 ReadAllKmods(); 740 } else { 741 LLDB_LOGF(log, "DynamicLoaderFreeBSDKernel::LoadKernelModules " 742 "cannot file modlist symbol"); 743 } 744} 745 746// Update symbol when use kldload by setting callback function on kldload 747void DynamicLoaderFreeBSDKernel::SetNotificationBreakPoint() {} 748 749// Hook called when attach to a process 750void DynamicLoaderFreeBSDKernel::DidAttach() { 751 PrivateInitialize(m_process); 752 Update(); 753} 754 755// Hook called after attach to a process 756void DynamicLoaderFreeBSDKernel::DidLaunch() { 757 PrivateInitialize(m_process); 758 Update(); 759} 760 761// Clear all member except kernel address 762void DynamicLoaderFreeBSDKernel::Clear(bool clear_process) { 763 std::lock_guard<decltype(m_mutex)> guard(m_mutex); 764 if (clear_process) 765 m_process = nullptr; 766 m_linker_file_head_addr.Clear(); 767 m_linker_file_list_struct_addr.Clear(); 768 m_kernel_image_info.Clear(); 769 m_linker_files_list.clear(); 770} 771 772// Reinitialize class 773void DynamicLoaderFreeBSDKernel::PrivateInitialize(Process *process) { 774 Clear(true); 775 m_process = process; 776} 777 778ThreadPlanSP DynamicLoaderFreeBSDKernel::GetStepThroughTrampolinePlan( 779 lldb_private::Thread &thread, bool stop_others) { 780 Log *log = GetLog(LLDBLog::Step); 781 LLDB_LOGF(log, "DynamicLoaderFreeBSDKernel::GetStepThroughTrampolinePlan is " 782 "not yet implemented."); 783 return {}; 784} 785 786Status DynamicLoaderFreeBSDKernel::CanLoadImage() { 787 Status error("shared object cannot be loaded into kernel"); 788 return error; 789} 790