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DWARFCallFrameInfo.cpp
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1 //===-- DWARFCallFrameInfo.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 
10 #include "lldb/Core/Module.h"
11 #include "lldb/Core/Section.h"
12 #include "lldb/Core/dwarf.h"
13 #include "lldb/Host/Host.h"
14 #include "lldb/Symbol/ObjectFile.h"
15 #include "lldb/Symbol/UnwindPlan.h"
17 #include "lldb/Target/Thread.h"
18 #include "lldb/Utility/ArchSpec.h"
19 #include "lldb/Utility/LLDBLog.h"
20 #include "lldb/Utility/Log.h"
21 #include "lldb/Utility/Timer.h"
22 #include <cstring>
23 #include <list>
24 
25 using namespace lldb;
26 using namespace lldb_private;
27 using namespace lldb_private::dwarf;
28 
29 // GetDwarfEHPtr
30 //
31 // Used for calls when the value type is specified by a DWARF EH Frame pointer
32 // encoding.
33 static uint64_t
34 GetGNUEHPointer(const DataExtractor &DE, offset_t *offset_ptr,
35  uint32_t eh_ptr_enc, addr_t pc_rel_addr, addr_t text_addr,
36  addr_t data_addr) //, BSDRelocs *data_relocs) const
37 {
38  if (eh_ptr_enc == DW_EH_PE_omit)
39  return ULLONG_MAX; // Value isn't in the buffer...
40 
41  uint64_t baseAddress = 0;
42  uint64_t addressValue = 0;
43  const uint32_t addr_size = DE.GetAddressByteSize();
44  assert(addr_size == 4 || addr_size == 8);
45 
46  bool signExtendValue = false;
47  // Decode the base part or adjust our offset
48  switch (eh_ptr_enc & 0x70) {
49  case DW_EH_PE_pcrel:
50  signExtendValue = true;
51  baseAddress = *offset_ptr;
52  if (pc_rel_addr != LLDB_INVALID_ADDRESS)
53  baseAddress += pc_rel_addr;
54  // else
55  // Log::GlobalWarning ("PC relative pointer encoding found with
56  // invalid pc relative address.");
57  break;
58 
59  case DW_EH_PE_textrel:
60  signExtendValue = true;
61  if (text_addr != LLDB_INVALID_ADDRESS)
62  baseAddress = text_addr;
63  // else
64  // Log::GlobalWarning ("text relative pointer encoding being
65  // decoded with invalid text section address, setting base address
66  // to zero.");
67  break;
68 
69  case DW_EH_PE_datarel:
70  signExtendValue = true;
71  if (data_addr != LLDB_INVALID_ADDRESS)
72  baseAddress = data_addr;
73  // else
74  // Log::GlobalWarning ("data relative pointer encoding being
75  // decoded with invalid data section address, setting base address
76  // to zero.");
77  break;
78 
79  case DW_EH_PE_funcrel:
80  signExtendValue = true;
81  break;
82 
83  case DW_EH_PE_aligned: {
84  // SetPointerSize should be called prior to extracting these so the pointer
85  // size is cached
86  assert(addr_size != 0);
87  if (addr_size) {
88  // Align to a address size boundary first
89  uint32_t alignOffset = *offset_ptr % addr_size;
90  if (alignOffset)
91  offset_ptr += addr_size - alignOffset;
92  }
93  } break;
94 
95  default:
96  break;
97  }
98 
99  // Decode the value part
100  switch (eh_ptr_enc & DW_EH_PE_MASK_ENCODING) {
101  case DW_EH_PE_absptr: {
102  addressValue = DE.GetAddress(offset_ptr);
103  // if (data_relocs)
104  // addressValue = data_relocs->Relocate(*offset_ptr -
105  // addr_size, *this, addressValue);
106  } break;
107  case DW_EH_PE_uleb128:
108  addressValue = DE.GetULEB128(offset_ptr);
109  break;
110  case DW_EH_PE_udata2:
111  addressValue = DE.GetU16(offset_ptr);
112  break;
113  case DW_EH_PE_udata4:
114  addressValue = DE.GetU32(offset_ptr);
115  break;
116  case DW_EH_PE_udata8:
117  addressValue = DE.GetU64(offset_ptr);
118  break;
119  case DW_EH_PE_sleb128:
120  addressValue = DE.GetSLEB128(offset_ptr);
121  break;
122  case DW_EH_PE_sdata2:
123  addressValue = (int16_t)DE.GetU16(offset_ptr);
124  break;
125  case DW_EH_PE_sdata4:
126  addressValue = (int32_t)DE.GetU32(offset_ptr);
127  break;
128  case DW_EH_PE_sdata8:
129  addressValue = (int64_t)DE.GetU64(offset_ptr);
130  break;
131  default:
132  // Unhandled encoding type
133  assert(eh_ptr_enc);
134  break;
135  }
136 
137  // Since we promote everything to 64 bit, we may need to sign extend
138  if (signExtendValue && addr_size < sizeof(baseAddress)) {
139  uint64_t sign_bit = 1ull << ((addr_size * 8ull) - 1ull);
140  if (sign_bit & addressValue) {
141  uint64_t mask = ~sign_bit + 1;
142  addressValue |= mask;
143  }
144  }
145  return baseAddress + addressValue;
146 }
147 
148 DWARFCallFrameInfo::DWARFCallFrameInfo(ObjectFile &objfile,
149  SectionSP &section_sp, Type type)
150  : m_objfile(objfile), m_section_sp(section_sp), m_type(type) {}
151 
153  UnwindPlan &unwind_plan) {
154  return GetUnwindPlan(AddressRange(addr, 1), unwind_plan);
155 }
156 
158  UnwindPlan &unwind_plan) {
159  FDEEntryMap::Entry fde_entry;
160  Address addr = range.GetBaseAddress();
161 
162  // Make sure that the Address we're searching for is the same object file as
163  // this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
164  ModuleSP module_sp = addr.GetModule();
165  if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr ||
166  module_sp->GetObjectFile() != &m_objfile)
167  return false;
168 
169  if (llvm::Optional<FDEEntryMap::Entry> entry = GetFirstFDEEntryInRange(range))
170  return FDEToUnwindPlan(entry->data, addr, unwind_plan);
171  return false;
172 }
173 
175 
176  // Make sure that the Address we're searching for is the same object file as
177  // this DWARFCallFrameInfo, we only store File offsets in m_fde_index.
178  ModuleSP module_sp = addr.GetModule();
179  if (module_sp.get() == nullptr || module_sp->GetObjectFile() == nullptr ||
180  module_sp->GetObjectFile() != &m_objfile)
181  return false;
182 
183  if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
184  return false;
185  GetFDEIndex();
186  FDEEntryMap::Entry *fde_entry =
188  if (!fde_entry)
189  return false;
190 
191  range = AddressRange(fde_entry->base, fde_entry->size,
193  return true;
194 }
195 
196 llvm::Optional<DWARFCallFrameInfo::FDEEntryMap::Entry>
198  if (!m_section_sp || m_section_sp->IsEncrypted())
199  return llvm::None;
200 
201  GetFDEIndex();
202 
203  addr_t start_file_addr = range.GetBaseAddress().GetFileAddress();
204  const FDEEntryMap::Entry *fde =
206  if (fde && fde->DoesIntersect(
207  FDEEntryMap::Range(start_file_addr, range.GetByteSize())))
208  return *fde;
209 
210  return llvm::None;
211 }
212 
214  FunctionAddressAndSizeVector &function_info) {
215  GetFDEIndex();
216  const size_t count = m_fde_index.GetSize();
217  function_info.Clear();
218  if (count > 0)
219  function_info.Reserve(count);
220  for (size_t i = 0; i < count; ++i) {
221  const FDEEntryMap::Entry *func_offset_data_entry =
223  if (func_offset_data_entry) {
224  FunctionAddressAndSizeVector::Entry function_offset_entry(
225  func_offset_data_entry->base, func_offset_data_entry->size);
226  function_info.Append(function_offset_entry);
227  }
228  }
229 }
230 
233  cie_map_t::iterator pos = m_cie_map.find(cie_offset);
234 
235  if (pos != m_cie_map.end()) {
236  // Parse and cache the CIE
237  if (pos->second == nullptr)
238  pos->second = ParseCIE(cie_offset);
239 
240  return pos->second.get();
241  }
242  return nullptr;
243 }
244 
247  CIESP cie_sp(new CIE(cie_offset));
248  lldb::offset_t offset = cie_offset;
250  GetCFIData();
251  uint32_t length = m_cfi_data.GetU32(&offset);
252  dw_offset_t cie_id, end_offset;
253  bool is_64bit = (length == UINT32_MAX);
254  if (is_64bit) {
255  length = m_cfi_data.GetU64(&offset);
256  cie_id = m_cfi_data.GetU64(&offset);
257  end_offset = cie_offset + length + 12;
258  } else {
259  cie_id = m_cfi_data.GetU32(&offset);
260  end_offset = cie_offset + length + 4;
261  }
262  if (length > 0 && ((m_type == DWARF && cie_id == UINT32_MAX) ||
263  (m_type == EH && cie_id == 0ul))) {
264  size_t i;
265  // cie.offset = cie_offset;
266  // cie.length = length;
267  // cie.cieID = cieID;
268  cie_sp->ptr_encoding = DW_EH_PE_absptr; // default
269  cie_sp->version = m_cfi_data.GetU8(&offset);
270  if (cie_sp->version > CFI_VERSION4) {
272  "CIE parse error: CFI version %d is not supported\n",
273  cie_sp->version);
274  return nullptr;
275  }
276 
277  for (i = 0; i < CFI_AUG_MAX_SIZE; ++i) {
278  cie_sp->augmentation[i] = m_cfi_data.GetU8(&offset);
279  if (cie_sp->augmentation[i] == '\0') {
280  // Zero out remaining bytes in augmentation string
281  for (size_t j = i + 1; j < CFI_AUG_MAX_SIZE; ++j)
282  cie_sp->augmentation[j] = '\0';
283 
284  break;
285  }
286  }
287 
288  if (i == CFI_AUG_MAX_SIZE &&
289  cie_sp->augmentation[CFI_AUG_MAX_SIZE - 1] != '\0') {
291  "CIE parse error: CIE augmentation string was too large "
292  "for the fixed sized buffer of %d bytes.\n",
294  return nullptr;
295  }
296 
297  // m_cfi_data uses address size from target architecture of the process may
298  // ignore these fields?
299  if (m_type == DWARF && cie_sp->version >= CFI_VERSION4) {
300  cie_sp->address_size = m_cfi_data.GetU8(&offset);
301  cie_sp->segment_size = m_cfi_data.GetU8(&offset);
302  }
303 
304  cie_sp->code_align = (uint32_t)m_cfi_data.GetULEB128(&offset);
305  cie_sp->data_align = (int32_t)m_cfi_data.GetSLEB128(&offset);
306 
307  cie_sp->return_addr_reg_num =
308  m_type == DWARF && cie_sp->version >= CFI_VERSION3
309  ? static_cast<uint32_t>(m_cfi_data.GetULEB128(&offset))
310  : m_cfi_data.GetU8(&offset);
311 
312  if (cie_sp->augmentation[0]) {
313  // Get the length of the eh_frame augmentation data which starts with a
314  // ULEB128 length in bytes
315  const size_t aug_data_len = (size_t)m_cfi_data.GetULEB128(&offset);
316  const size_t aug_data_end = offset + aug_data_len;
317  const size_t aug_str_len = strlen(cie_sp->augmentation);
318  // A 'z' may be present as the first character of the string.
319  // If present, the Augmentation Data field shall be present. The contents
320  // of the Augmentation Data shall be interpreted according to other
321  // characters in the Augmentation String.
322  if (cie_sp->augmentation[0] == 'z') {
323  // Extract the Augmentation Data
324  size_t aug_str_idx = 0;
325  for (aug_str_idx = 1; aug_str_idx < aug_str_len; aug_str_idx++) {
326  char aug = cie_sp->augmentation[aug_str_idx];
327  switch (aug) {
328  case 'L':
329  // Indicates the presence of one argument in the Augmentation Data
330  // of the CIE, and a corresponding argument in the Augmentation
331  // Data of the FDE. The argument in the Augmentation Data of the
332  // CIE is 1-byte and represents the pointer encoding used for the
333  // argument in the Augmentation Data of the FDE, which is the
334  // address of a language-specific data area (LSDA). The size of the
335  // LSDA pointer is specified by the pointer encoding used.
336  cie_sp->lsda_addr_encoding = m_cfi_data.GetU8(&offset);
337  break;
338 
339  case 'P':
340  // Indicates the presence of two arguments in the Augmentation Data
341  // of the CIE. The first argument is 1-byte and represents the
342  // pointer encoding used for the second argument, which is the
343  // address of a personality routine handler. The size of the
344  // personality routine pointer is specified by the pointer encoding
345  // used.
346  //
347  // The address of the personality function will be stored at this
348  // location. Pre-execution, it will be all zero's so don't read it
349  // until we're trying to do an unwind & the reloc has been
350  // resolved.
351  {
352  uint8_t arg_ptr_encoding = m_cfi_data.GetU8(&offset);
353  const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
354  cie_sp->personality_loc = GetGNUEHPointer(
355  m_cfi_data, &offset, arg_ptr_encoding, pc_rel_addr,
357  }
358  break;
359 
360  case 'R':
361  // A 'R' may be present at any position after the
362  // first character of the string. The Augmentation Data shall
363  // include a 1 byte argument that represents the pointer encoding
364  // for the address pointers used in the FDE. Example: 0x1B ==
365  // DW_EH_PE_pcrel | DW_EH_PE_sdata4
366  cie_sp->ptr_encoding = m_cfi_data.GetU8(&offset);
367  break;
368  }
369  }
370  } else if (strcmp(cie_sp->augmentation, "eh") == 0) {
371  // If the Augmentation string has the value "eh", then the EH Data
372  // field shall be present
373  }
374 
375  // Set the offset to be the end of the augmentation data just in case we
376  // didn't understand any of the data.
377  offset = (uint32_t)aug_data_end;
378  }
379 
380  if (end_offset > offset) {
381  cie_sp->inst_offset = offset;
382  cie_sp->inst_length = end_offset - offset;
383  }
384  while (offset < end_offset) {
385  uint8_t inst = m_cfi_data.GetU8(&offset);
386  uint8_t primary_opcode = inst & 0xC0;
387  uint8_t extended_opcode = inst & 0x3F;
388 
389  if (!HandleCommonDwarfOpcode(primary_opcode, extended_opcode,
390  cie_sp->data_align, offset,
391  cie_sp->initial_row))
392  break; // Stop if we hit an unrecognized opcode
393  }
394  }
395 
396  return cie_sp;
397 }
398 
400  if (!m_cfi_data_initialized) {
401  Log *log = GetLog(LLDBLog::Unwind);
402  if (log)
403  m_objfile.GetModule()->LogMessage(log, "Reading EH frame info");
405  m_cfi_data_initialized = true;
406  }
407 }
408 // Scan through the eh_frame or debug_frame section looking for FDEs and noting
409 // the start/end addresses of the functions and a pointer back to the
410 // function's FDE for later expansion. Internalize CIEs as we come across them.
411 
413  if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
414  return;
415 
417  return;
418 
419  std::lock_guard<std::mutex> guard(m_fde_index_mutex);
420 
421  if (m_fde_index_initialized) // if two threads hit the locker
422  return;
423 
424  LLDB_SCOPED_TIMERF("%s - %s", LLVM_PRETTY_FUNCTION,
426 
427  bool clear_address_zeroth_bit = false;
428  if (ArchSpec arch = m_objfile.GetArchitecture()) {
429  if (arch.GetTriple().getArch() == llvm::Triple::arm ||
430  arch.GetTriple().getArch() == llvm::Triple::thumb)
431  clear_address_zeroth_bit = true;
432  }
433 
434  lldb::offset_t offset = 0;
436  GetCFIData();
437  while (m_cfi_data.ValidOffsetForDataOfSize(offset, 8)) {
438  const dw_offset_t current_entry = offset;
439  dw_offset_t cie_id, next_entry, cie_offset;
440  uint32_t len = m_cfi_data.GetU32(&offset);
441  bool is_64bit = (len == UINT32_MAX);
442  if (is_64bit) {
443  len = m_cfi_data.GetU64(&offset);
444  cie_id = m_cfi_data.GetU64(&offset);
445  next_entry = current_entry + len + 12;
446  cie_offset = current_entry + 12 - cie_id;
447  } else {
448  cie_id = m_cfi_data.GetU32(&offset);
449  next_entry = current_entry + len + 4;
450  cie_offset = current_entry + 4 - cie_id;
451  }
452 
453  if (next_entry > m_cfi_data.GetByteSize() + 1) {
454  Host::SystemLog(Host::eSystemLogError, "error: Invalid fde/cie next "
455  "entry offset of 0x%x found in "
456  "cie/fde at 0x%x\n",
457  next_entry, current_entry);
458  // Don't trust anything in this eh_frame section if we find blatantly
459  // invalid data.
460  m_fde_index.Clear();
462  return;
463  }
464 
465  // An FDE entry contains CIE_pointer in debug_frame in same place as cie_id
466  // in eh_frame. CIE_pointer is an offset into the .debug_frame section. So,
467  // variable cie_offset should be equal to cie_id for debug_frame.
468  // FDE entries with cie_id == 0 shouldn't be ignored for it.
469  if ((cie_id == 0 && m_type == EH) || cie_id == UINT32_MAX || len == 0) {
470  auto cie_sp = ParseCIE(current_entry);
471  if (!cie_sp) {
472  // Cannot parse, the reason is already logged
473  m_fde_index.Clear();
475  return;
476  }
477 
478  m_cie_map[current_entry] = std::move(cie_sp);
479  offset = next_entry;
480  continue;
481  }
482 
483  if (m_type == DWARF)
484  cie_offset = cie_id;
485 
486  if (cie_offset > m_cfi_data.GetByteSize()) {
488  "error: Invalid cie offset of 0x%x "
489  "found in cie/fde at 0x%x\n",
490  cie_offset, current_entry);
491  // Don't trust anything in this eh_frame section if we find blatantly
492  // invalid data.
493  m_fde_index.Clear();
495  return;
496  }
497 
498  const CIE *cie = GetCIE(cie_offset);
499  if (cie) {
500  const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
501  const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
502  const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
503 
504  lldb::addr_t addr =
505  GetGNUEHPointer(m_cfi_data, &offset, cie->ptr_encoding, pc_rel_addr,
506  text_addr, data_addr);
507  if (clear_address_zeroth_bit)
508  addr &= ~1ull;
509 
510  lldb::addr_t length = GetGNUEHPointer(
512  pc_rel_addr, text_addr, data_addr);
513  FDEEntryMap::Entry fde(addr, length, current_entry);
514  m_fde_index.Append(fde);
515  } else {
516  Host::SystemLog(Host::eSystemLogError, "error: unable to find CIE at "
517  "0x%8.8x for cie_id = 0x%8.8x for "
518  "entry at 0x%8.8x.\n",
519  cie_offset, cie_id, current_entry);
520  }
521  offset = next_entry;
522  }
523  m_fde_index.Sort();
525 }
526 
528  Address startaddr,
529  UnwindPlan &unwind_plan) {
530  Log *log = GetLog(LLDBLog::Unwind);
531  lldb::offset_t offset = dwarf_offset;
532  lldb::offset_t current_entry = offset;
533 
534  if (m_section_sp.get() == nullptr || m_section_sp->IsEncrypted())
535  return false;
536 
538  GetCFIData();
539 
540  uint32_t length = m_cfi_data.GetU32(&offset);
541  dw_offset_t cie_offset;
542  bool is_64bit = (length == UINT32_MAX);
543  if (is_64bit) {
544  length = m_cfi_data.GetU64(&offset);
545  cie_offset = m_cfi_data.GetU64(&offset);
546  } else {
547  cie_offset = m_cfi_data.GetU32(&offset);
548  }
549 
550  // FDE entries with zeroth cie_offset may occur for debug_frame.
551  assert(!(m_type == EH && 0 == cie_offset) && cie_offset != UINT32_MAX);
552 
553  // Translate the CIE_id from the eh_frame format, which is relative to the
554  // FDE offset, into a __eh_frame section offset
555  if (m_type == EH) {
556  unwind_plan.SetSourceName("eh_frame CFI");
557  cie_offset = current_entry + (is_64bit ? 12 : 4) - cie_offset;
559  } else {
560  unwind_plan.SetSourceName("DWARF CFI");
561  // In theory the debug_frame info should be valid at all call sites
562  // ("asynchronous unwind info" as it is sometimes called) but in practice
563  // gcc et al all emit call frame info for the prologue and call sites, but
564  // not for the epilogue or all the other locations during the function
565  // reliably.
567  }
569 
570  const CIE *cie = GetCIE(cie_offset);
571  assert(cie != nullptr);
572 
573  const dw_offset_t end_offset = current_entry + length + (is_64bit ? 12 : 4);
574 
575  const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress();
576  const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS;
577  const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS;
578  lldb::addr_t range_base =
579  GetGNUEHPointer(m_cfi_data, &offset, cie->ptr_encoding, pc_rel_addr,
580  text_addr, data_addr);
581  lldb::addr_t range_len = GetGNUEHPointer(
583  pc_rel_addr, text_addr, data_addr);
584  AddressRange range(range_base, m_objfile.GetAddressByteSize(),
586  range.SetByteSize(range_len);
587 
588  addr_t lsda_data_file_address = LLDB_INVALID_ADDRESS;
589 
590  if (cie->augmentation[0] == 'z') {
591  uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
592  if (aug_data_len != 0 && cie->lsda_addr_encoding != DW_EH_PE_omit) {
593  offset_t saved_offset = offset;
594  lsda_data_file_address =
596  pc_rel_addr, text_addr, data_addr);
597  if (offset - saved_offset != aug_data_len) {
598  // There is more in the augmentation region than we know how to process;
599  // don't read anything.
600  lsda_data_file_address = LLDB_INVALID_ADDRESS;
601  }
602  offset = saved_offset;
603  }
604  offset += aug_data_len;
605  }
606  unwind_plan.SetUnwindPlanForSignalTrap(
607  strchr(cie->augmentation, 'S') ? eLazyBoolYes : eLazyBoolNo);
608 
609  Address lsda_data;
610  Address personality_function_ptr;
611 
612  if (lsda_data_file_address != LLDB_INVALID_ADDRESS &&
614  m_objfile.GetModule()->ResolveFileAddress(lsda_data_file_address,
615  lsda_data);
616  m_objfile.GetModule()->ResolveFileAddress(cie->personality_loc,
617  personality_function_ptr);
618  }
619 
620  if (lsda_data.IsValid() && personality_function_ptr.IsValid()) {
621  unwind_plan.SetLSDAAddress(lsda_data);
622  unwind_plan.SetPersonalityFunctionPtr(personality_function_ptr);
623  }
624 
625  uint32_t code_align = cie->code_align;
626  int32_t data_align = cie->data_align;
627 
628  unwind_plan.SetPlanValidAddressRange(range);
629  UnwindPlan::Row *cie_initial_row = new UnwindPlan::Row;
630  *cie_initial_row = cie->initial_row;
631  UnwindPlan::RowSP row(cie_initial_row);
632 
633  unwind_plan.SetRegisterKind(GetRegisterKind());
635 
636  std::vector<UnwindPlan::RowSP> stack;
637 
639  while (m_cfi_data.ValidOffset(offset) && offset < end_offset) {
640  uint8_t inst = m_cfi_data.GetU8(&offset);
641  uint8_t primary_opcode = inst & 0xC0;
642  uint8_t extended_opcode = inst & 0x3F;
643 
644  if (!HandleCommonDwarfOpcode(primary_opcode, extended_opcode, data_align,
645  offset, *row)) {
646  if (primary_opcode) {
647  switch (primary_opcode) {
648  case DW_CFA_advance_loc: // (Row Creation Instruction)
649  { // 0x40 - high 2 bits are 0x1, lower 6 bits are delta
650  // takes a single argument that represents a constant delta. The
651  // required action is to create a new table row with a location value
652  // that is computed by taking the current entry's location value and
653  // adding (delta * code_align). All other values in the new row are
654  // initially identical to the current row.
655  unwind_plan.AppendRow(row);
656  UnwindPlan::Row *newrow = new UnwindPlan::Row;
657  *newrow = *row.get();
658  row.reset(newrow);
659  row->SlideOffset(extended_opcode * code_align);
660  break;
661  }
662 
663  case DW_CFA_restore: { // 0xC0 - high 2 bits are 0x3, lower 6 bits are
664  // register
665  // takes a single argument that represents a register number. The
666  // required action is to change the rule for the indicated register
667  // to the rule assigned it by the initial_instructions in the CIE.
668  uint32_t reg_num = extended_opcode;
669  // We only keep enough register locations around to unwind what is in
670  // our thread, and these are organized by the register index in that
671  // state, so we need to convert our eh_frame register number from the
672  // EH frame info, to a register index
673 
674  if (unwind_plan.IsValidRowIndex(0) &&
675  unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num,
676  reg_location))
677  row->SetRegisterInfo(reg_num, reg_location);
678  break;
679  }
680  }
681  } else {
682  switch (extended_opcode) {
683  case DW_CFA_set_loc: // 0x1 (Row Creation Instruction)
684  {
685  // DW_CFA_set_loc takes a single argument that represents an address.
686  // The required action is to create a new table row using the
687  // specified address as the location. All other values in the new row
688  // are initially identical to the current row. The new location value
689  // should always be greater than the current one.
690  unwind_plan.AppendRow(row);
691  UnwindPlan::Row *newrow = new UnwindPlan::Row;
692  *newrow = *row.get();
693  row.reset(newrow);
694  row->SetOffset(m_cfi_data.GetAddress(&offset) -
695  startaddr.GetFileAddress());
696  break;
697  }
698 
699  case DW_CFA_advance_loc1: // 0x2 (Row Creation Instruction)
700  {
701  // takes a single uword argument that represents a constant delta.
702  // This instruction is identical to DW_CFA_advance_loc except for the
703  // encoding and size of the delta argument.
704  unwind_plan.AppendRow(row);
705  UnwindPlan::Row *newrow = new UnwindPlan::Row;
706  *newrow = *row.get();
707  row.reset(newrow);
708  row->SlideOffset(m_cfi_data.GetU8(&offset) * code_align);
709  break;
710  }
711 
712  case DW_CFA_advance_loc2: // 0x3 (Row Creation Instruction)
713  {
714  // takes a single uword argument that represents a constant delta.
715  // This instruction is identical to DW_CFA_advance_loc except for the
716  // encoding and size of the delta argument.
717  unwind_plan.AppendRow(row);
718  UnwindPlan::Row *newrow = new UnwindPlan::Row;
719  *newrow = *row.get();
720  row.reset(newrow);
721  row->SlideOffset(m_cfi_data.GetU16(&offset) * code_align);
722  break;
723  }
724 
725  case DW_CFA_advance_loc4: // 0x4 (Row Creation Instruction)
726  {
727  // takes a single uword argument that represents a constant delta.
728  // This instruction is identical to DW_CFA_advance_loc except for the
729  // encoding and size of the delta argument.
730  unwind_plan.AppendRow(row);
731  UnwindPlan::Row *newrow = new UnwindPlan::Row;
732  *newrow = *row.get();
733  row.reset(newrow);
734  row->SlideOffset(m_cfi_data.GetU32(&offset) * code_align);
735  break;
736  }
737 
738  case DW_CFA_restore_extended: // 0x6
739  {
740  // takes a single unsigned LEB128 argument that represents a register
741  // number. This instruction is identical to DW_CFA_restore except for
742  // the encoding and size of the register argument.
743  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
744  if (unwind_plan.IsValidRowIndex(0) &&
745  unwind_plan.GetRowAtIndex(0)->GetRegisterInfo(reg_num,
746  reg_location))
747  row->SetRegisterInfo(reg_num, reg_location);
748  break;
749  }
750 
751  case DW_CFA_remember_state: // 0xA
752  {
753  // These instructions define a stack of information. Encountering the
754  // DW_CFA_remember_state instruction means to save the rules for
755  // every register on the current row on the stack. Encountering the
756  // DW_CFA_restore_state instruction means to pop the set of rules off
757  // the stack and place them in the current row. (This operation is
758  // useful for compilers that move epilogue code into the body of a
759  // function.)
760  stack.push_back(row);
761  UnwindPlan::Row *newrow = new UnwindPlan::Row;
762  *newrow = *row.get();
763  row.reset(newrow);
764  break;
765  }
766 
767  case DW_CFA_restore_state: // 0xB
768  {
769  // These instructions define a stack of information. Encountering the
770  // DW_CFA_remember_state instruction means to save the rules for
771  // every register on the current row on the stack. Encountering the
772  // DW_CFA_restore_state instruction means to pop the set of rules off
773  // the stack and place them in the current row. (This operation is
774  // useful for compilers that move epilogue code into the body of a
775  // function.)
776  if (stack.empty()) {
777  LLDB_LOGF(log,
778  "DWARFCallFrameInfo::%s(dwarf_offset: %" PRIx32
779  ", startaddr: %" PRIx64
780  " encountered DW_CFA_restore_state but state stack "
781  "is empty. Corrupt unwind info?",
782  __FUNCTION__, dwarf_offset, startaddr.GetFileAddress());
783  break;
784  }
785  lldb::addr_t offset = row->GetOffset();
786  row = stack.back();
787  stack.pop_back();
788  row->SetOffset(offset);
789  break;
790  }
791 
792  case DW_CFA_GNU_args_size: // 0x2e
793  {
794  // The DW_CFA_GNU_args_size instruction takes an unsigned LEB128
795  // operand representing an argument size. This instruction specifies
796  // the total of the size of the arguments which have been pushed onto
797  // the stack.
798 
799  // TODO: Figure out how we should handle this.
800  m_cfi_data.GetULEB128(&offset);
801  break;
802  }
803 
804  case DW_CFA_val_offset: // 0x14
805  case DW_CFA_val_offset_sf: // 0x15
806  default:
807  break;
808  }
809  }
810  }
811  }
812  unwind_plan.AppendRow(row);
813 
814  return true;
815 }
816 
818  uint8_t extended_opcode,
819  int32_t data_align,
820  lldb::offset_t &offset,
821  UnwindPlan::Row &row) {
823 
824  if (primary_opcode) {
825  switch (primary_opcode) {
826  case DW_CFA_offset: { // 0x80 - high 2 bits are 0x2, lower 6 bits are
827  // register
828  // takes two arguments: an unsigned LEB128 constant representing a
829  // factored offset and a register number. The required action is to
830  // change the rule for the register indicated by the register number to
831  // be an offset(N) rule with a value of (N = factored offset *
832  // data_align).
833  uint8_t reg_num = extended_opcode;
834  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
835  reg_location.SetAtCFAPlusOffset(op_offset);
836  row.SetRegisterInfo(reg_num, reg_location);
837  return true;
838  }
839  }
840  } else {
841  switch (extended_opcode) {
842  case DW_CFA_nop: // 0x0
843  return true;
844 
845  case DW_CFA_offset_extended: // 0x5
846  {
847  // takes two unsigned LEB128 arguments representing a register number and
848  // a factored offset. This instruction is identical to DW_CFA_offset
849  // except for the encoding and size of the register argument.
850  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
851  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align;
853  reg_location.SetAtCFAPlusOffset(op_offset);
854  row.SetRegisterInfo(reg_num, reg_location);
855  return true;
856  }
857 
858  case DW_CFA_undefined: // 0x7
859  {
860  // takes a single unsigned LEB128 argument that represents a register
861  // number. The required action is to set the rule for the specified
862  // register to undefined.
863  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
865  reg_location.SetUndefined();
866  row.SetRegisterInfo(reg_num, reg_location);
867  return true;
868  }
869 
870  case DW_CFA_same_value: // 0x8
871  {
872  // takes a single unsigned LEB128 argument that represents a register
873  // number. The required action is to set the rule for the specified
874  // register to same value.
875  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
877  reg_location.SetSame();
878  row.SetRegisterInfo(reg_num, reg_location);
879  return true;
880  }
881 
882  case DW_CFA_register: // 0x9
883  {
884  // takes two unsigned LEB128 arguments representing register numbers. The
885  // required action is to set the rule for the first register to be the
886  // second register.
887  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
888  uint32_t other_reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
890  reg_location.SetInRegister(other_reg_num);
891  row.SetRegisterInfo(reg_num, reg_location);
892  return true;
893  }
894 
895  case DW_CFA_def_cfa: // 0xC (CFA Definition Instruction)
896  {
897  // Takes two unsigned LEB128 operands representing a register number and
898  // a (non-factored) offset. The required action is to define the current
899  // CFA rule to use the provided register and offset.
900  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
901  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
902  row.GetCFAValue().SetIsRegisterPlusOffset(reg_num, op_offset);
903  return true;
904  }
905 
906  case DW_CFA_def_cfa_register: // 0xD (CFA Definition Instruction)
907  {
908  // takes a single unsigned LEB128 argument representing a register
909  // number. The required action is to define the current CFA rule to use
910  // the provided register (but to keep the old offset).
911  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
912  row.GetCFAValue().SetIsRegisterPlusOffset(reg_num,
913  row.GetCFAValue().GetOffset());
914  return true;
915  }
916 
917  case DW_CFA_def_cfa_offset: // 0xE (CFA Definition Instruction)
918  {
919  // Takes a single unsigned LEB128 operand representing a (non-factored)
920  // offset. The required action is to define the current CFA rule to use
921  // the provided offset (but to keep the old register).
922  int32_t op_offset = (int32_t)m_cfi_data.GetULEB128(&offset);
924  row.GetCFAValue().GetRegisterNumber(), op_offset);
925  return true;
926  }
927 
928  case DW_CFA_def_cfa_expression: // 0xF (CFA Definition Instruction)
929  {
930  size_t block_len = (size_t)m_cfi_data.GetULEB128(&offset);
931  const uint8_t *block_data =
932  static_cast<const uint8_t *>(m_cfi_data.GetData(&offset, block_len));
933  row.GetCFAValue().SetIsDWARFExpression(block_data, block_len);
934  return true;
935  }
936 
937  case DW_CFA_expression: // 0x10
938  {
939  // Takes two operands: an unsigned LEB128 value representing a register
940  // number, and a DW_FORM_block value representing a DWARF expression. The
941  // required action is to change the rule for the register indicated by
942  // the register number to be an expression(E) rule where E is the DWARF
943  // expression. That is, the DWARF expression computes the address. The
944  // value of the CFA is pushed on the DWARF evaluation stack prior to
945  // execution of the DWARF expression.
946  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
947  uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
948  const uint8_t *block_data =
949  static_cast<const uint8_t *>(m_cfi_data.GetData(&offset, block_len));
951  reg_location.SetAtDWARFExpression(block_data, block_len);
952  row.SetRegisterInfo(reg_num, reg_location);
953  return true;
954  }
955 
956  case DW_CFA_offset_extended_sf: // 0x11
957  {
958  // takes two operands: an unsigned LEB128 value representing a register
959  // number and a signed LEB128 factored offset. This instruction is
960  // identical to DW_CFA_offset_extended except that the second operand is
961  // signed and factored.
962  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
963  int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
965  reg_location.SetAtCFAPlusOffset(op_offset);
966  row.SetRegisterInfo(reg_num, reg_location);
967  return true;
968  }
969 
970  case DW_CFA_def_cfa_sf: // 0x12 (CFA Definition Instruction)
971  {
972  // Takes two operands: an unsigned LEB128 value representing a register
973  // number and a signed LEB128 factored offset. This instruction is
974  // identical to DW_CFA_def_cfa except that the second operand is signed
975  // and factored.
976  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
977  int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
978  row.GetCFAValue().SetIsRegisterPlusOffset(reg_num, op_offset);
979  return true;
980  }
981 
982  case DW_CFA_def_cfa_offset_sf: // 0x13 (CFA Definition Instruction)
983  {
984  // takes a signed LEB128 operand representing a factored offset. This
985  // instruction is identical to DW_CFA_def_cfa_offset except that the
986  // operand is signed and factored.
987  int32_t op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align;
988  uint32_t cfa_regnum = row.GetCFAValue().GetRegisterNumber();
989  row.GetCFAValue().SetIsRegisterPlusOffset(cfa_regnum, op_offset);
990  return true;
991  }
992 
993  case DW_CFA_val_expression: // 0x16
994  {
995  // takes two operands: an unsigned LEB128 value representing a register
996  // number, and a DW_FORM_block value representing a DWARF expression. The
997  // required action is to change the rule for the register indicated by
998  // the register number to be a val_expression(E) rule where E is the
999  // DWARF expression. That is, the DWARF expression computes the value of
1000  // the given register. The value of the CFA is pushed on the DWARF
1001  // evaluation stack prior to execution of the DWARF expression.
1002  uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset);
1003  uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset);
1004  const uint8_t *block_data =
1005  (const uint8_t *)m_cfi_data.GetData(&offset, block_len);
1006  reg_location.SetIsDWARFExpression(block_data, block_len);
1007  row.SetRegisterInfo(reg_num, reg_location);
1008  return true;
1009  }
1010  }
1011  }
1012  return false;
1013 }
1014 
1016  const std::function<bool(lldb::addr_t, uint32_t, dw_offset_t)> &callback) {
1017  GetFDEIndex();
1018 
1019  for (size_t i = 0, c = m_fde_index.GetSize(); i < c; ++i) {
1020  const FDEEntryMap::Entry &entry = m_fde_index.GetEntryRef(i);
1021  if (!callback(entry.base, entry.size, entry.data))
1022  break;
1023  }
1024 }
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@ EH
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Definition: DWARFCallFrameInfo.h:35
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Definition: DWARFCallFrameInfo.h:149
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Definition: DataExtractor.cpp:425
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Definition: AddressRange.h:237
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Definition: lldb-defines.h:74
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Definition: SBCommandInterpreterRunOptions.h:16
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Definition: DataExtractor.cpp:347
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Definition: DataExtractor.h:337
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Definition: Host.h:89
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Definition: DWARFCallFrameInfo.cpp:232
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Definition: Address.cpp:283
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Get the number of bytes contained in this object.
Definition: DataExtractor.h:270
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Definition: UnwindPlan.h:53
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Definition: FileSpec.cpp:340
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