1 //===-- UnwindAssemblyInstEmulation.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 #include "UnwindAssemblyInstEmulation.h" 11 12 #include "llvm-c/EnhancedDisassembly.h" 13 14 #include "lldb/Core/Address.h" 15 #include "lldb/Core/ArchSpec.h" 16 #include "lldb/Core/DataBufferHeap.h" 17 #include "lldb/Core/DataExtractor.h" 18 #include "lldb/Core/Disassembler.h" 19 #include "lldb/Core/Error.h" 20 #include "lldb/Core/Log.h" 21 #include "lldb/Core/PluginManager.h" 22 #include "lldb/Core/StreamString.h" 23 #include "lldb/Target/ExecutionContext.h" 24 #include "lldb/Target/Process.h" 25 #include "lldb/Target/Thread.h" 26 #include "lldb/Target/Target.h" 27 28 using namespace lldb; 29 using namespace lldb_private; 30 31 32 33 //----------------------------------------------------------------------------------------------- 34 // UnwindAssemblyInstEmulation method definitions 35 //----------------------------------------------------------------------------------------------- 36 37 bool 38 UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly (AddressRange& range, 39 Thread& thread, 40 UnwindPlan& unwind_plan) 41 { 42 if (range.GetByteSize() > 0 && 43 range.GetBaseAddress().IsValid() && 44 m_inst_emulator_ap.get()) 45 { 46 47 // The the instruction emulation subclass setup the unwind plan for the 48 // first instruction. 49 m_inst_emulator_ap->CreateFunctionEntryUnwind (unwind_plan); 50 51 // CreateFunctionEntryUnwind should have created the first row. If it 52 // doesn't, then we are done. 53 if (unwind_plan.GetRowCount() == 0) 54 return false; 55 56 ExecutionContext exe_ctx; 57 thread.CalculateExecutionContext(exe_ctx); 58 DisassemblerSP disasm_sp (Disassembler::DisassembleRange (m_arch, 59 NULL, 60 exe_ctx, 61 range)); 62 63 LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 64 65 if (disasm_sp) 66 { 67 68 m_range_ptr = ⦥ 69 m_thread_ptr = &thread; 70 m_unwind_plan_ptr = &unwind_plan; 71 72 const uint32_t addr_byte_size = m_arch.GetAddressByteSize(); 73 const bool show_address = true; 74 const bool show_bytes = true; 75 m_inst_emulator_ap->GetRegisterInfo (unwind_plan.GetRegisterKind(), 76 unwind_plan.GetInitialCFARegister(), 77 m_cfa_reg_info); 78 79 m_fp_is_cfa = false; 80 m_register_values.clear(); 81 m_pushed_regs.clear(); 82 83 // Initialize the CFA with a known value. In the 32 bit case 84 // it will be 0x80000000, and in the 64 bit case 0x8000000000000000. 85 // We use the address byte size to be safe for any future addresss sizes 86 m_initial_sp = (1ull << ((addr_byte_size * 8) - 1)); 87 RegisterValue cfa_reg_value; 88 cfa_reg_value.SetUInt (m_initial_sp, m_cfa_reg_info.byte_size); 89 SetRegisterValue (m_cfa_reg_info, cfa_reg_value); 90 91 const InstructionList &inst_list = disasm_sp->GetInstructionList (); 92 const size_t num_instructions = inst_list.GetSize(); 93 94 if (num_instructions > 0) 95 { 96 Instruction *inst = inst_list.GetInstructionAtIndex (0).get(); 97 const addr_t base_addr = inst->GetAddress().GetFileAddress(); 98 99 // Make a copy of the current instruction Row and save it in m_curr_row 100 // so we can add updates as we process the instructions. 101 UnwindPlan::RowSP last_row = unwind_plan.GetLastRow(); 102 UnwindPlan::Row *newrow = new UnwindPlan::Row; 103 if (last_row.get()) 104 *newrow = *last_row.get(); 105 m_curr_row.reset(newrow); 106 107 // Once we've seen the initial prologue instructions complete, save a 108 // copy of the CFI at that point into prologue_completed_row for possible 109 // use later. 110 int instructions_since_last_prologue_insn = 0; // # of insns since last CFI was update 111 bool prologue_complete = false; // true if we have finished prologue setup 112 113 bool reinstate_prologue_next_instruction = false; // Next iteration, re-install the prologue row of CFI 114 115 bool last_instruction_restored_return_addr_reg = false; // re-install the prologue row of CFI if the next instruction is a branch immediate 116 117 UnwindPlan::RowSP prologue_completed_row; // copy of prologue row of CFI 118 119 // cache the pc register number (in whatever register numbering this UnwindPlan uses) for 120 // quick reference during instruction parsing. 121 uint32_t pc_reg_num = LLDB_INVALID_REGNUM; 122 RegisterInfo pc_reg_info; 123 if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info)) 124 pc_reg_num = pc_reg_info.kinds[unwind_plan.GetRegisterKind()]; 125 else 126 pc_reg_num = LLDB_INVALID_REGNUM; 127 128 // cache the return address register number (in whatever register numbering this UnwindPlan uses) for 129 // quick reference during instruction parsing. 130 uint32_t ra_reg_num = LLDB_INVALID_REGNUM; 131 RegisterInfo ra_reg_info; 132 if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, ra_reg_info)) 133 ra_reg_num = ra_reg_info.kinds[unwind_plan.GetRegisterKind()]; 134 else 135 ra_reg_num = LLDB_INVALID_REGNUM; 136 137 for (size_t idx=0; idx<num_instructions; ++idx) 138 { 139 m_curr_row_modified = false; 140 inst = inst_list.GetInstructionAtIndex (idx).get(); 141 if (inst) 142 { 143 if (log && log->GetVerbose ()) 144 { 145 StreamString strm; 146 inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize (), show_address, show_bytes, NULL); 147 log->PutCString (strm.GetData()); 148 } 149 150 m_inst_emulator_ap->SetInstruction (inst->GetOpcode(), 151 inst->GetAddress(), 152 exe_ctx.GetTargetPtr()); 153 154 m_inst_emulator_ap->EvaluateInstruction (eEmulateInstructionOptionIgnoreConditions); 155 156 // Were there any changes to the CFI while evaluating this instruction? 157 if (m_curr_row_modified) 158 { 159 reinstate_prologue_next_instruction = false; 160 m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); 161 // Append the new row 162 unwind_plan.AppendRow (m_curr_row); 163 164 // Allocate a new Row for m_curr_row, copy the current state into it 165 UnwindPlan::Row *newrow = new UnwindPlan::Row; 166 *newrow = *m_curr_row.get(); 167 m_curr_row.reset(newrow); 168 169 instructions_since_last_prologue_insn = 0; 170 171 // If the caller's pc is "same", we've just executed an epilogue and we return to the caller 172 // after this instruction completes executing. 173 // If there are any instructions past this, there must have been flow control over this 174 // epilogue so we'll reinstate the original prologue setup instructions. 175 UnwindPlan::Row::RegisterLocation pc_regloc; 176 UnwindPlan::Row::RegisterLocation ra_regloc; 177 if (prologue_complete 178 && pc_reg_num != LLDB_INVALID_REGNUM 179 && m_curr_row->GetRegisterInfo (pc_reg_num, pc_regloc) 180 && pc_regloc.IsSame()) 181 { 182 if (log && log->GetVerbose()) 183 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- pc is <same>, restore prologue instructions."); 184 reinstate_prologue_next_instruction = true; 185 } 186 else if (prologue_complete 187 && ra_reg_num != LLDB_INVALID_REGNUM 188 && m_curr_row->GetRegisterInfo (ra_reg_num, ra_regloc) 189 && ra_regloc.IsSame()) 190 { 191 if (log && log->GetVerbose()) 192 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- lr is <same>, restore prologue instruction if the next instruction is a branch immediate."); 193 last_instruction_restored_return_addr_reg = true; 194 } 195 } 196 else 197 { 198 // If the previous instruction was a return-to-caller (epilogue), and we're still executing 199 // instructions in this function, there must be a code path that jumps over that epilogue. 200 // Also detect the case where we epilogue & branch imm to another function (tail-call opt) 201 // instead of a normal pop lr-into-pc exit. 202 // Reinstate the frame setup from the prologue. 203 if (reinstate_prologue_next_instruction 204 || (m_curr_insn_is_branch_immediate && last_instruction_restored_return_addr_reg)) 205 { 206 if (log && log->GetVerbose()) 207 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- Reinstating prologue instruction set"); 208 UnwindPlan::Row *newrow = new UnwindPlan::Row; 209 *newrow = *prologue_completed_row.get(); 210 m_curr_row.reset(newrow); 211 m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); 212 unwind_plan.AppendRow(m_curr_row); 213 214 newrow = new UnwindPlan::Row; 215 *newrow = *m_curr_row.get(); 216 m_curr_row.reset(newrow); 217 218 reinstate_prologue_next_instruction = false; 219 last_instruction_restored_return_addr_reg = false; 220 m_curr_insn_is_branch_immediate = false; 221 } 222 223 // clear both of these if either one wasn't set 224 if (last_instruction_restored_return_addr_reg) 225 { 226 last_instruction_restored_return_addr_reg = false; 227 } 228 if (m_curr_insn_is_branch_immediate) 229 { 230 m_curr_insn_is_branch_immediate = false; 231 } 232 233 // If we haven't seen any prologue instructions for a while (4 instructions in a row), 234 // the function prologue has probably completed. Save a copy of that Row. 235 if (prologue_complete == false && instructions_since_last_prologue_insn++ > 3) 236 { 237 prologue_complete = true; 238 UnwindPlan::Row *newrow = new UnwindPlan::Row; 239 *newrow = *m_curr_row.get(); 240 prologue_completed_row.reset(newrow); 241 if (log && log->GetVerbose()) 242 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- prologue has been set up, saving a copy."); 243 } 244 } 245 } 246 } 247 } 248 } 249 250 if (log && log->GetVerbose ()) 251 { 252 StreamString strm; 253 lldb::addr_t base_addr = range.GetBaseAddress().GetLoadAddress(thread.CalculateTarget().get()); 254 strm.Printf ("Resulting unwind rows for [0x%llx - 0x%llx):", base_addr, base_addr + range.GetByteSize()); 255 unwind_plan.Dump(strm, &thread, base_addr); 256 log->PutCString (strm.GetData()); 257 } 258 return unwind_plan.GetRowCount() > 0; 259 } 260 return false; 261 } 262 263 bool 264 UnwindAssemblyInstEmulation::GetFastUnwindPlan (AddressRange& func, 265 Thread& thread, 266 UnwindPlan &unwind_plan) 267 { 268 return false; 269 } 270 271 bool 272 UnwindAssemblyInstEmulation::FirstNonPrologueInsn (AddressRange& func, 273 const ExecutionContext &exe_ctx, 274 Address& first_non_prologue_insn) 275 { 276 return false; 277 } 278 279 UnwindAssembly * 280 UnwindAssemblyInstEmulation::CreateInstance (const ArchSpec &arch) 281 { 282 std::auto_ptr<EmulateInstruction> inst_emulator_ap (EmulateInstruction::FindPlugin (arch, eInstructionTypePrologueEpilogue, NULL)); 283 // Make sure that all prologue instructions are handled 284 if (inst_emulator_ap.get()) 285 return new UnwindAssemblyInstEmulation (arch, inst_emulator_ap.release()); 286 return NULL; 287 } 288 289 290 //------------------------------------------------------------------ 291 // PluginInterface protocol in UnwindAssemblyParser_x86 292 //------------------------------------------------------------------ 293 294 const char * 295 UnwindAssemblyInstEmulation::GetPluginName() 296 { 297 return "UnwindAssemblyInstEmulation"; 298 } 299 300 const char * 301 UnwindAssemblyInstEmulation::GetShortPluginName() 302 { 303 return "unwindassembly.inst-emulation"; 304 } 305 306 307 uint32_t 308 UnwindAssemblyInstEmulation::GetPluginVersion() 309 { 310 return 1; 311 } 312 313 void 314 UnwindAssemblyInstEmulation::Initialize() 315 { 316 PluginManager::RegisterPlugin (GetPluginNameStatic(), 317 GetPluginDescriptionStatic(), 318 CreateInstance); 319 } 320 321 void 322 UnwindAssemblyInstEmulation::Terminate() 323 { 324 PluginManager::UnregisterPlugin (CreateInstance); 325 } 326 327 328 const char * 329 UnwindAssemblyInstEmulation::GetPluginNameStatic() 330 { 331 return "UnwindAssemblyInstEmulation"; 332 } 333 334 const char * 335 UnwindAssemblyInstEmulation::GetPluginDescriptionStatic() 336 { 337 return "Instruction emulation based unwind information."; 338 } 339 340 341 uint64_t 342 UnwindAssemblyInstEmulation::MakeRegisterKindValuePair (const RegisterInfo ®_info) 343 { 344 uint32_t reg_kind, reg_num; 345 if (EmulateInstruction::GetBestRegisterKindAndNumber (®_info, reg_kind, reg_num)) 346 return (uint64_t)reg_kind << 24 | reg_num; 347 return 0ull; 348 } 349 350 void 351 UnwindAssemblyInstEmulation::SetRegisterValue (const RegisterInfo ®_info, const RegisterValue ®_value) 352 { 353 m_register_values[MakeRegisterKindValuePair (reg_info)] = reg_value; 354 } 355 356 bool 357 UnwindAssemblyInstEmulation::GetRegisterValue (const RegisterInfo ®_info, RegisterValue ®_value) 358 { 359 const uint64_t reg_id = MakeRegisterKindValuePair (reg_info); 360 RegisterValueMap::const_iterator pos = m_register_values.find(reg_id); 361 if (pos != m_register_values.end()) 362 { 363 reg_value = pos->second; 364 return true; // We had a real value that comes from an opcode that wrote 365 // to it... 366 } 367 // We are making up a value that is recognizable... 368 reg_value.SetUInt(reg_id, reg_info.byte_size); 369 return false; 370 } 371 372 373 size_t 374 UnwindAssemblyInstEmulation::ReadMemory (EmulateInstruction *instruction, 375 void *baton, 376 const EmulateInstruction::Context &context, 377 lldb::addr_t addr, 378 void *dst, 379 size_t dst_len) 380 { 381 LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 382 383 if (log && log->GetVerbose ()) 384 { 385 StreamString strm; 386 strm.Printf ("UnwindAssemblyInstEmulation::ReadMemory (addr = 0x%16.16llx, dst = %p, dst_len = %llu, context = ", 387 addr, 388 dst, 389 (uint64_t)dst_len); 390 context.Dump(strm, instruction); 391 log->PutCString (strm.GetData ()); 392 } 393 memset (dst, 0, dst_len); 394 return dst_len; 395 } 396 397 size_t 398 UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, 399 void *baton, 400 const EmulateInstruction::Context &context, 401 lldb::addr_t addr, 402 const void *dst, 403 size_t dst_len) 404 { 405 if (baton && dst && dst_len) 406 return ((UnwindAssemblyInstEmulation *)baton)->WriteMemory (instruction, context, addr, dst, dst_len); 407 return 0; 408 } 409 410 size_t 411 UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, 412 const EmulateInstruction::Context &context, 413 lldb::addr_t addr, 414 const void *dst, 415 size_t dst_len) 416 { 417 DataExtractor data (dst, 418 dst_len, 419 instruction->GetArchitecture ().GetByteOrder(), 420 instruction->GetArchitecture ().GetAddressByteSize()); 421 422 LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 423 424 if (log && log->GetVerbose ()) 425 { 426 StreamString strm; 427 428 strm.PutCString ("UnwindAssemblyInstEmulation::WriteMemory ("); 429 data.Dump(&strm, 0, eFormatBytes, 1, dst_len, UINT32_MAX, addr, 0, 0); 430 strm.PutCString (", context = "); 431 context.Dump(strm, instruction); 432 log->PutCString (strm.GetData()); 433 } 434 435 const bool can_replace = true; 436 const bool cant_replace = false; 437 438 switch (context.type) 439 { 440 default: 441 case EmulateInstruction::eContextInvalid: 442 case EmulateInstruction::eContextReadOpcode: 443 case EmulateInstruction::eContextImmediate: 444 case EmulateInstruction::eContextAdjustBaseRegister: 445 case EmulateInstruction::eContextRegisterPlusOffset: 446 case EmulateInstruction::eContextAdjustPC: 447 case EmulateInstruction::eContextRegisterStore: 448 case EmulateInstruction::eContextRegisterLoad: 449 case EmulateInstruction::eContextRelativeBranchImmediate: 450 case EmulateInstruction::eContextAbsoluteBranchRegister: 451 case EmulateInstruction::eContextSupervisorCall: 452 case EmulateInstruction::eContextTableBranchReadMemory: 453 case EmulateInstruction::eContextWriteRegisterRandomBits: 454 case EmulateInstruction::eContextWriteMemoryRandomBits: 455 case EmulateInstruction::eContextArithmetic: 456 case EmulateInstruction::eContextAdvancePC: 457 case EmulateInstruction::eContextReturnFromException: 458 case EmulateInstruction::eContextPopRegisterOffStack: 459 case EmulateInstruction::eContextAdjustStackPointer: 460 break; 461 462 case EmulateInstruction::eContextPushRegisterOnStack: 463 { 464 uint32_t reg_num = LLDB_INVALID_REGNUM; 465 bool is_return_address_reg = false; 466 const uint32_t unwind_reg_kind = m_unwind_plan_ptr->GetRegisterKind(); 467 if (context.info_type == EmulateInstruction::eInfoTypeRegisterToRegisterPlusOffset) 468 { 469 reg_num = context.info.RegisterToRegisterPlusOffset.data_reg.kinds[unwind_reg_kind]; 470 if (context.info.RegisterToRegisterPlusOffset.data_reg.kinds[eRegisterKindGeneric] == LLDB_REGNUM_GENERIC_RA) 471 is_return_address_reg = true; 472 } 473 else 474 { 475 assert (!"unhandled case, add code to handle this!"); 476 } 477 478 if (reg_num != LLDB_INVALID_REGNUM) 479 { 480 if (m_pushed_regs.find (reg_num) == m_pushed_regs.end()) 481 { 482 m_pushed_regs[reg_num] = addr; 483 const int32_t offset = addr - m_initial_sp; 484 m_curr_row->SetRegisterLocationToAtCFAPlusOffset (reg_num, offset, cant_replace); 485 m_curr_row_modified = true; 486 if (is_return_address_reg) 487 { 488 // This push was pushing the return address register, 489 // so this is also how we will unwind the PC... 490 RegisterInfo pc_reg_info; 491 if (instruction->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info)) 492 { 493 uint32_t pc_reg_num = pc_reg_info.kinds[unwind_reg_kind]; 494 if (pc_reg_num != LLDB_INVALID_REGNUM) 495 { 496 m_curr_row->SetRegisterLocationToAtCFAPlusOffset (pc_reg_num, offset, can_replace); 497 m_curr_row_modified = true; 498 } 499 } 500 } 501 } 502 } 503 } 504 break; 505 506 } 507 508 return dst_len; 509 } 510 511 bool 512 UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, 513 void *baton, 514 const RegisterInfo *reg_info, 515 RegisterValue ®_value) 516 { 517 518 if (baton && reg_info) 519 return ((UnwindAssemblyInstEmulation *)baton)->ReadRegister (instruction, reg_info, reg_value); 520 return false; 521 } 522 bool 523 UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, 524 const RegisterInfo *reg_info, 525 RegisterValue ®_value) 526 { 527 bool synthetic = GetRegisterValue (*reg_info, reg_value); 528 529 LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 530 531 if (log && log->GetVerbose ()) 532 { 533 534 StreamString strm; 535 strm.Printf ("UnwindAssemblyInstEmulation::ReadRegister (name = \"%s\") => synthetic_value = %i, value = ", reg_info->name, synthetic); 536 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 537 log->PutCString(strm.GetData()); 538 } 539 return true; 540 } 541 542 bool 543 UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, 544 void *baton, 545 const EmulateInstruction::Context &context, 546 const RegisterInfo *reg_info, 547 const RegisterValue ®_value) 548 { 549 if (baton && reg_info) 550 return ((UnwindAssemblyInstEmulation *)baton)->WriteRegister (instruction, context, reg_info, reg_value); 551 return false; 552 } 553 bool 554 UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, 555 const EmulateInstruction::Context &context, 556 const RegisterInfo *reg_info, 557 const RegisterValue ®_value) 558 { 559 LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 560 561 if (log && log->GetVerbose ()) 562 { 563 564 StreamString strm; 565 strm.Printf ("UnwindAssemblyInstEmulation::WriteRegister (name = \"%s\", value = ", reg_info->name); 566 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 567 strm.PutCString (", context = "); 568 context.Dump(strm, instruction); 569 log->PutCString(strm.GetData()); 570 } 571 572 const bool must_replace = true; 573 SetRegisterValue (*reg_info, reg_value); 574 575 switch (context.type) 576 { 577 default: 578 case EmulateInstruction::eContextInvalid: 579 case EmulateInstruction::eContextReadOpcode: 580 case EmulateInstruction::eContextImmediate: 581 case EmulateInstruction::eContextAdjustBaseRegister: 582 case EmulateInstruction::eContextRegisterPlusOffset: 583 case EmulateInstruction::eContextAdjustPC: 584 case EmulateInstruction::eContextRegisterStore: 585 case EmulateInstruction::eContextRegisterLoad: 586 case EmulateInstruction::eContextAbsoluteBranchRegister: 587 case EmulateInstruction::eContextSupervisorCall: 588 case EmulateInstruction::eContextTableBranchReadMemory: 589 case EmulateInstruction::eContextWriteRegisterRandomBits: 590 case EmulateInstruction::eContextWriteMemoryRandomBits: 591 case EmulateInstruction::eContextArithmetic: 592 case EmulateInstruction::eContextAdvancePC: 593 case EmulateInstruction::eContextReturnFromException: 594 case EmulateInstruction::eContextPushRegisterOnStack: 595 // { 596 // const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 597 // if (reg_num != LLDB_INVALID_REGNUM) 598 // { 599 // const bool can_replace_only_if_unspecified = true; 600 // 601 // m_curr_row.SetRegisterLocationToUndefined (reg_num, 602 // can_replace_only_if_unspecified, 603 // can_replace_only_if_unspecified); 604 // m_curr_row_modified = true; 605 // } 606 // } 607 break; 608 609 case EmulateInstruction::eContextRelativeBranchImmediate: 610 { 611 612 { 613 m_curr_insn_is_branch_immediate = true; 614 } 615 } 616 break; 617 618 case EmulateInstruction::eContextPopRegisterOffStack: 619 { 620 const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 621 if (reg_num != LLDB_INVALID_REGNUM) 622 { 623 m_curr_row->SetRegisterLocationToSame (reg_num, must_replace); 624 m_curr_row_modified = true; 625 } 626 } 627 break; 628 629 case EmulateInstruction::eContextSetFramePointer: 630 if (!m_fp_is_cfa) 631 { 632 m_fp_is_cfa = true; 633 m_cfa_reg_info = *reg_info; 634 const uint32_t cfa_reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 635 assert (cfa_reg_num != LLDB_INVALID_REGNUM); 636 m_curr_row->SetCFARegister(cfa_reg_num); 637 m_curr_row->SetCFAOffset(m_initial_sp - reg_value.GetAsUInt64()); 638 m_curr_row_modified = true; 639 } 640 break; 641 642 case EmulateInstruction::eContextAdjustStackPointer: 643 // If we have created a frame using the frame pointer, don't follow 644 // subsequent adjustments to the stack pointer. 645 if (!m_fp_is_cfa) 646 { 647 m_curr_row->SetCFAOffset (m_initial_sp - reg_value.GetAsUInt64()); 648 m_curr_row_modified = true; 649 } 650 break; 651 } 652 return true; 653 } 654 655 656