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JITLoaderGDB.cpp
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1 //===-- JITLoaderGDB.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 "JITLoaderGDB.h"
12 #include "lldb/Core/Module.h"
13 #include "lldb/Core/ModuleSpec.h"
15 #include "lldb/Core/Section.h"
17 #include "lldb/Symbol/ObjectFile.h"
18 #include "lldb/Symbol/Symbol.h"
21 #include "lldb/Target/Process.h"
23 #include "lldb/Target/Target.h"
26 #include "lldb/Utility/LLDBLog.h"
27 #include "lldb/Utility/Log.h"
29 #include "llvm/Support/MathExtras.h"
30 
31 #include <memory>
32 
33 using namespace lldb;
34 using namespace lldb_private;
35 
37 
38 // Debug Interface Structures
40 
41 template <typename ptr_t> struct jit_code_entry {
42  ptr_t next_entry; // pointer
43  ptr_t prev_entry; // pointer
44  ptr_t symfile_addr; // pointer
45  uint64_t symfile_size;
46 };
47 
48 template <typename ptr_t> struct jit_descriptor {
50  uint32_t action_flag; // Values are jit_action_t
51  ptr_t relevant_entry; // pointer
52  ptr_t first_entry; // pointer
53 };
54 
55 namespace {
56 
57 enum EnableJITLoaderGDB {
58  eEnableJITLoaderGDBDefault,
59  eEnableJITLoaderGDBOn,
60  eEnableJITLoaderGDBOff,
61 };
62 
63 static constexpr OptionEnumValueElement g_enable_jit_loader_gdb_enumerators[] =
64  {
65  {
66  eEnableJITLoaderGDBDefault,
67  "default",
68  "Enable JIT compilation interface for all platforms except macOS",
69  },
70  {
71  eEnableJITLoaderGDBOn,
72  "on",
73  "Enable JIT compilation interface",
74  },
75  {
76  eEnableJITLoaderGDBOff,
77  "off",
78  "Disable JIT compilation interface",
79  },
80 };
81 
82 #define LLDB_PROPERTIES_jitloadergdb
83 #include "JITLoaderGDBProperties.inc"
84 
85 enum {
86 #define LLDB_PROPERTIES_jitloadergdb
87 #include "JITLoaderGDBPropertiesEnum.inc"
88  ePropertyEnableJITBreakpoint
89 };
90 
91 class PluginProperties : public Properties {
92 public:
93  static ConstString GetSettingName() {
95  }
96 
97  PluginProperties() {
98  m_collection_sp = std::make_shared<OptionValueProperties>(GetSettingName());
99  m_collection_sp->Initialize(g_jitloadergdb_properties);
100  }
101 
102  EnableJITLoaderGDB GetEnable() const {
103  return (EnableJITLoaderGDB)m_collection_sp->GetPropertyAtIndexAsEnumeration(
104  nullptr, ePropertyEnable,
105  g_jitloadergdb_properties[ePropertyEnable].default_uint_value);
106  }
107 };
108 
109 static PluginProperties &GetGlobalPluginProperties() {
110  static PluginProperties g_settings;
111  return g_settings;
112 }
113 
114 template <typename ptr_t>
115 bool ReadJITEntry(const addr_t from_addr, Process *process,
116  jit_code_entry<ptr_t> *entry) {
117  lldbassert(from_addr % sizeof(ptr_t) == 0);
118 
119  ArchSpec::Core core = process->GetTarget().GetArchitecture().GetCore();
120  bool i386_target = ArchSpec::kCore_x86_32_first <= core &&
121  core <= ArchSpec::kCore_x86_32_last;
122  uint8_t uint64_align_bytes = i386_target ? 4 : 8;
123  const size_t data_byte_size =
124  llvm::alignTo(sizeof(ptr_t) * 3, uint64_align_bytes) + sizeof(uint64_t);
125 
126  Status error;
127  DataBufferHeap data(data_byte_size, 0);
128  size_t bytes_read = process->ReadMemory(from_addr, data.GetBytes(),
129  data.GetByteSize(), error);
130  if (bytes_read != data_byte_size || !error.Success())
131  return false;
132 
133  DataExtractor extractor(data.GetBytes(), data.GetByteSize(),
134  process->GetByteOrder(), sizeof(ptr_t));
135  lldb::offset_t offset = 0;
136  entry->next_entry = extractor.GetAddress(&offset);
137  entry->prev_entry = extractor.GetAddress(&offset);
138  entry->symfile_addr = extractor.GetAddress(&offset);
139  offset = llvm::alignTo(offset, uint64_align_bytes);
140  entry->symfile_size = extractor.GetU64(&offset);
141 
142  return true;
143 }
144 
145 } // anonymous namespace end
146 
148  : JITLoader(process), m_jit_objects(),
149  m_jit_break_id(LLDB_INVALID_BREAK_ID),
150  m_jit_descriptor_addr(LLDB_INVALID_ADDRESS) {}
151 
155 }
156 
158  if (!PluginManager::GetSettingForJITLoaderPlugin(
159  debugger, PluginProperties::GetSettingName())) {
160  const bool is_global_setting = true;
161  PluginManager::CreateSettingForJITLoaderPlugin(
162  debugger, GetGlobalPluginProperties().GetValueProperties(),
163  ConstString("Properties for the JIT LoaderGDB plug-in."),
164  is_global_setting);
165  }
166 }
167 
169  Target &target = m_process->GetTarget();
170  ModuleList &module_list = target.GetImages();
171  SetJITBreakpoint(module_list);
172 }
173 
175  Target &target = m_process->GetTarget();
176  ModuleList &module_list = target.GetImages();
177  SetJITBreakpoint(module_list);
178 }
179 
182  SetJITBreakpoint(module_list);
183 }
184 
185 // Setup the JIT Breakpoint
187  if (DidSetJITBreakpoint())
188  return;
189 
190  Log *log = GetLog(LLDBLog::JITLoader);
191  LLDB_LOGF(log, "JITLoaderGDB::%s looking for JIT register hook",
192  __FUNCTION__);
193 
194  addr_t jit_addr = GetSymbolAddress(
195  module_list, ConstString("__jit_debug_register_code"), eSymbolTypeAny);
196  if (jit_addr == LLDB_INVALID_ADDRESS)
197  return;
198 
200  module_list, ConstString("__jit_debug_descriptor"), eSymbolTypeData);
202  LLDB_LOGF(log, "JITLoaderGDB::%s failed to find JIT descriptor address",
203  __FUNCTION__);
204  return;
205  }
206 
207  LLDB_LOGF(log, "JITLoaderGDB::%s setting JIT breakpoint", __FUNCTION__);
208 
209  Breakpoint *bp =
210  m_process->GetTarget().CreateBreakpoint(jit_addr, true, false).get();
211  bp->SetCallback(JITDebugBreakpointHit, this, true);
212  bp->SetBreakpointKind("jit-debug-register");
213  m_jit_break_id = bp->GetID();
214 
215  ReadJITDescriptor(true);
216 }
217 
219  StoppointCallbackContext *context,
220  user_id_t break_id,
221  user_id_t break_loc_id) {
222  Log *log = GetLog(LLDBLog::JITLoader);
223  LLDB_LOGF(log, "JITLoaderGDB::%s hit JIT breakpoint", __FUNCTION__);
224  JITLoaderGDB *instance = static_cast<JITLoaderGDB *>(baton);
225  return instance->ReadJITDescriptor(false);
226 }
227 
228 static void updateSectionLoadAddress(const SectionList &section_list,
229  Target &target, uint64_t symbolfile_addr,
230  uint64_t symbolfile_size,
231  uint64_t &vmaddrheuristic,
232  uint64_t &min_addr, uint64_t &max_addr) {
233  const uint32_t num_sections = section_list.GetSize();
234  for (uint32_t i = 0; i < num_sections; ++i) {
235  SectionSP section_sp(section_list.GetSectionAtIndex(i));
236  if (section_sp) {
237  if (section_sp->IsFake()) {
238  uint64_t lower = (uint64_t)-1;
239  uint64_t upper = 0;
240  updateSectionLoadAddress(section_sp->GetChildren(), target,
241  symbolfile_addr, symbolfile_size,
242  vmaddrheuristic, lower, upper);
243  if (lower < min_addr)
244  min_addr = lower;
245  if (upper > max_addr)
246  max_addr = upper;
247  const lldb::addr_t slide_amount = lower - section_sp->GetFileAddress();
248  section_sp->Slide(slide_amount, false);
249  section_sp->GetChildren().Slide(-slide_amount, false);
250  section_sp->SetByteSize(upper - lower);
251  } else {
252  vmaddrheuristic += 2 << section_sp->GetLog2Align();
253  uint64_t lower;
254  if (section_sp->GetFileAddress() > vmaddrheuristic)
255  lower = section_sp->GetFileAddress();
256  else {
257  lower = symbolfile_addr + section_sp->GetFileOffset();
258  section_sp->SetFileAddress(symbolfile_addr +
259  section_sp->GetFileOffset());
260  }
261  target.SetSectionLoadAddress(section_sp, lower, true);
262  uint64_t upper = lower + section_sp->GetByteSize();
263  if (lower < min_addr)
264  min_addr = lower;
265  if (upper > max_addr)
266  max_addr = upper;
267  // This is an upper bound, but a good enough heuristic
268  vmaddrheuristic += section_sp->GetByteSize();
269  }
270  }
271  }
272 }
273 
274 bool JITLoaderGDB::ReadJITDescriptor(bool all_entries) {
276  return ReadJITDescriptorImpl<uint64_t>(all_entries);
277  else
278  return ReadJITDescriptorImpl<uint32_t>(all_entries);
279 }
280 
281 template <typename ptr_t>
282 bool JITLoaderGDB::ReadJITDescriptorImpl(bool all_entries) {
284  return false;
285 
286  Log *log = GetLog(LLDBLog::JITLoader);
287  Target &target = m_process->GetTarget();
288  ModuleList &module_list = target.GetImages();
289 
290  jit_descriptor<ptr_t> jit_desc;
291  const size_t jit_desc_size = sizeof(jit_desc);
292  Status error;
293  size_t bytes_read = m_process->ReadMemory(m_jit_descriptor_addr, &jit_desc,
294  jit_desc_size, error);
295  if (bytes_read != jit_desc_size || !error.Success()) {
296  LLDB_LOGF(log, "JITLoaderGDB::%s failed to read JIT descriptor",
297  __FUNCTION__);
298  return false;
299  }
300 
301  jit_actions_t jit_action = (jit_actions_t)jit_desc.action_flag;
302  addr_t jit_relevant_entry = (addr_t)jit_desc.relevant_entry;
303  if (all_entries) {
304  jit_action = JIT_REGISTER_FN;
305  jit_relevant_entry = (addr_t)jit_desc.first_entry;
306  }
307 
308  while (jit_relevant_entry != 0) {
309  jit_code_entry<ptr_t> jit_entry;
310  if (!ReadJITEntry(jit_relevant_entry, m_process, &jit_entry)) {
311  LLDB_LOGF(log, "JITLoaderGDB::%s failed to read JIT entry at 0x%" PRIx64,
312  __FUNCTION__, jit_relevant_entry);
313  return false;
314  }
315 
316  const addr_t &symbolfile_addr = (addr_t)jit_entry.symfile_addr;
317  const size_t &symbolfile_size = (size_t)jit_entry.symfile_size;
318  ModuleSP module_sp;
319 
320  if (jit_action == JIT_REGISTER_FN) {
321  LLDB_LOGF(log,
322  "JITLoaderGDB::%s registering JIT entry at 0x%" PRIx64
323  " (%" PRIu64 " bytes)",
324  __FUNCTION__, symbolfile_addr, (uint64_t)symbolfile_size);
325 
326  char jit_name[64];
327  snprintf(jit_name, 64, "JIT(0x%" PRIx64 ")", symbolfile_addr);
328  module_sp = m_process->ReadModuleFromMemory(
329  FileSpec(jit_name), symbolfile_addr, symbolfile_size);
330 
331  if (module_sp && module_sp->GetObjectFile()) {
332  // Object formats (like ELF) have no representation for a JIT type.
333  // We will get it wrong, if we deduce it from the header.
334  module_sp->GetObjectFile()->SetType(ObjectFile::eTypeJIT);
335 
336  // load the symbol table right away
337  module_sp->GetObjectFile()->GetSymtab();
338 
339  m_jit_objects.insert(std::make_pair(symbolfile_addr, module_sp));
340  if (auto image_object_file =
341  llvm::dyn_cast<ObjectFileMachO>(module_sp->GetObjectFile())) {
342  const SectionList *section_list = image_object_file->GetSectionList();
343  if (section_list) {
344  uint64_t vmaddrheuristic = 0;
345  uint64_t lower = (uint64_t)-1;
346  uint64_t upper = 0;
347  updateSectionLoadAddress(*section_list, target, symbolfile_addr,
348  symbolfile_size, vmaddrheuristic, lower,
349  upper);
350  }
351  } else {
352  bool changed = false;
353  module_sp->SetLoadAddress(target, 0, true, changed);
354  }
355 
356  module_list.AppendIfNeeded(module_sp);
357 
358  ModuleList module_list;
359  module_list.Append(module_sp);
360  target.ModulesDidLoad(module_list);
361  } else {
362  LLDB_LOGF(log,
363  "JITLoaderGDB::%s failed to load module for "
364  "JIT entry at 0x%" PRIx64,
365  __FUNCTION__, symbolfile_addr);
366  }
367  } else if (jit_action == JIT_UNREGISTER_FN) {
368  LLDB_LOGF(log, "JITLoaderGDB::%s unregistering JIT entry at 0x%" PRIx64,
369  __FUNCTION__, symbolfile_addr);
370 
371  JITObjectMap::iterator it = m_jit_objects.find(symbolfile_addr);
372  if (it != m_jit_objects.end()) {
373  module_sp = it->second;
374  ObjectFile *image_object_file = module_sp->GetObjectFile();
375  if (image_object_file) {
376  const SectionList *section_list = image_object_file->GetSectionList();
377  if (section_list) {
378  const uint32_t num_sections = section_list->GetSize();
379  for (uint32_t i = 0; i < num_sections; ++i) {
380  SectionSP section_sp(section_list->GetSectionAtIndex(i));
381  if (section_sp) {
382  target.GetSectionLoadList().SetSectionUnloaded(section_sp);
383  }
384  }
385  }
386  }
387  module_list.Remove(module_sp);
388  m_jit_objects.erase(it);
389  }
390  } else if (jit_action == JIT_NOACTION) {
391  // Nothing to do
392  } else {
393  assert(false && "Unknown jit action");
394  }
395 
396  if (all_entries)
397  jit_relevant_entry = (addr_t)jit_entry.next_entry;
398  else
399  jit_relevant_entry = 0;
400  }
401 
402  return false; // Continue Running.
403 }
404 
405 // PluginInterface protocol
406 JITLoaderSP JITLoaderGDB::CreateInstance(Process *process, bool force) {
407  JITLoaderSP jit_loader_sp;
408  bool enable;
409  switch (GetGlobalPluginProperties().GetEnable()) {
410  case EnableJITLoaderGDB::eEnableJITLoaderGDBOn:
411  enable = true;
412  break;
413  case EnableJITLoaderGDB::eEnableJITLoaderGDBOff:
414  enable = false;
415  break;
416  case EnableJITLoaderGDB::eEnableJITLoaderGDBDefault:
417  ArchSpec arch(process->GetTarget().GetArchitecture());
418  enable = arch.GetTriple().getVendor() != llvm::Triple::Apple;
419  break;
420  }
421  if (enable)
422  jit_loader_sp = std::make_shared<JITLoaderGDB>(process);
423  return jit_loader_sp;
424 }
425 
427  return "JIT loader plug-in that watches for JIT events using the GDB "
428  "interface.";
429 }
430 
432  PluginManager::RegisterPlugin(GetPluginNameStatic(),
435 }
436 
438  PluginManager::UnregisterPlugin(CreateInstance);
439 }
440 
443 }
444 
446  ConstString name,
447  SymbolType symbol_type) const {
448  SymbolContextList target_symbols;
449  Target &target = m_process->GetTarget();
450 
451  module_list.FindSymbolsWithNameAndType(name, symbol_type, target_symbols);
452  if (target_symbols.IsEmpty())
453  return LLDB_INVALID_ADDRESS;
454 
455  SymbolContext sym_ctx;
456  target_symbols.GetContextAtIndex(0, sym_ctx);
457 
458  const Address jit_descriptor_addr = sym_ctx.symbol->GetAddress();
459  if (!jit_descriptor_addr.IsValid())
460  return LLDB_INVALID_ADDRESS;
461 
462  const addr_t jit_addr = jit_descriptor_addr.GetLoadAddress(&target);
463  return jit_addr;
464 }
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