1 //===-- UnwindAssemblyInstEmulation.cpp --------------------------*- C++ 2 //-*-===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is distributed under the University of Illinois Open Source 7 // License. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 #include "UnwindAssemblyInstEmulation.h" 12 13 #include "lldb/Core/Address.h" 14 #include "lldb/Core/ArchSpec.h" 15 #include "lldb/Core/DataBufferHeap.h" 16 #include "lldb/Core/DataExtractor.h" 17 #include "lldb/Core/Disassembler.h" 18 #include "lldb/Core/Error.h" 19 #include "lldb/Core/FormatEntity.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/Target.h" 26 #include "lldb/Target/Thread.h" 27 28 using namespace lldb; 29 using namespace lldb_private; 30 31 //----------------------------------------------------------------------------------------------- 32 // UnwindAssemblyInstEmulation method definitions 33 //----------------------------------------------------------------------------------------------- 34 35 bool UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly( 36 AddressRange &range, Thread &thread, UnwindPlan &unwind_plan) { 37 if (range.GetByteSize() > 0 && range.GetBaseAddress().IsValid() && 38 m_inst_emulator_ap.get()) { 39 40 // The instruction emulation subclass setup the unwind plan for the 41 // first instruction. 42 m_inst_emulator_ap->CreateFunctionEntryUnwind(unwind_plan); 43 44 // CreateFunctionEntryUnwind should have created the first row. If it 45 // doesn't, then we are done. 46 if (unwind_plan.GetRowCount() == 0) 47 return false; 48 49 ExecutionContext exe_ctx; 50 thread.CalculateExecutionContext(exe_ctx); 51 const bool prefer_file_cache = true; 52 DisassemblerSP disasm_sp(Disassembler::DisassembleRange( 53 m_arch, NULL, NULL, exe_ctx, range, prefer_file_cache)); 54 55 Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND)); 56 57 if (disasm_sp) { 58 59 m_range_ptr = ⦥ 60 m_thread_ptr = &thread; 61 m_unwind_plan_ptr = &unwind_plan; 62 63 const uint32_t addr_byte_size = m_arch.GetAddressByteSize(); 64 const bool show_address = true; 65 const bool show_bytes = true; 66 m_inst_emulator_ap->GetRegisterInfo(unwind_plan.GetRegisterKind(), 67 unwind_plan.GetInitialCFARegister(), 68 m_cfa_reg_info); 69 70 m_fp_is_cfa = false; 71 m_register_values.clear(); 72 m_pushed_regs.clear(); 73 74 // Initialize the CFA with a known value. In the 32 bit case 75 // it will be 0x80000000, and in the 64 bit case 0x8000000000000000. 76 // We use the address byte size to be safe for any future address sizes 77 m_initial_sp = (1ull << ((addr_byte_size * 8) - 1)); 78 RegisterValue cfa_reg_value; 79 cfa_reg_value.SetUInt(m_initial_sp, m_cfa_reg_info.byte_size); 80 SetRegisterValue(m_cfa_reg_info, cfa_reg_value); 81 82 const InstructionList &inst_list = disasm_sp->GetInstructionList(); 83 const size_t num_instructions = inst_list.GetSize(); 84 85 if (num_instructions > 0) { 86 Instruction *inst = inst_list.GetInstructionAtIndex(0).get(); 87 const lldb::addr_t base_addr = inst->GetAddress().GetFileAddress(); 88 89 // Map for storing the unwind plan row and the value of the registers at 90 // a given offset. 91 // When we see a forward branch we add a new entry to this map with the 92 // actual unwind plan 93 // row and register context for the target address of the branch as the 94 // current data have 95 // to be valid for the target address of the branch too if we are in the 96 // same function. 97 std::map<lldb::addr_t, std::pair<UnwindPlan::RowSP, RegisterValueMap>> 98 saved_unwind_states; 99 100 // Make a copy of the current instruction Row and save it in m_curr_row 101 // so we can add updates as we process the instructions. 102 UnwindPlan::RowSP last_row = unwind_plan.GetLastRow(); 103 UnwindPlan::Row *newrow = new UnwindPlan::Row; 104 if (last_row.get()) 105 *newrow = *last_row.get(); 106 m_curr_row.reset(newrow); 107 108 // Add the initial state to the save list with offset 0. 109 saved_unwind_states.insert({0, {last_row, m_register_values}}); 110 111 // cache the pc register number (in whatever register numbering this 112 // UnwindPlan uses) for 113 // quick reference during instruction parsing. 114 RegisterInfo pc_reg_info; 115 m_inst_emulator_ap->GetRegisterInfo( 116 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info); 117 118 // cache the return address register number (in whatever register 119 // numbering this UnwindPlan uses) for 120 // quick reference during instruction parsing. 121 RegisterInfo ra_reg_info; 122 m_inst_emulator_ap->GetRegisterInfo( 123 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, ra_reg_info); 124 125 // The architecture dependent condition code of the last processed 126 // instruction. 127 EmulateInstruction::InstructionCondition last_condition = 128 EmulateInstruction::UnconditionalCondition; 129 lldb::addr_t condition_block_start_offset = 0; 130 131 for (size_t idx = 0; idx < num_instructions; ++idx) { 132 m_curr_row_modified = false; 133 m_forward_branch_offset = 0; 134 135 inst = inst_list.GetInstructionAtIndex(idx).get(); 136 if (inst) { 137 lldb::addr_t current_offset = 138 inst->GetAddress().GetFileAddress() - base_addr; 139 auto it = saved_unwind_states.upper_bound(current_offset); 140 assert(it != saved_unwind_states.begin() && 141 "Unwind row for the function entry missing"); 142 --it; // Move it to the row corresponding to the current offset 143 144 // If the offset of m_curr_row don't match with the offset we see in 145 // saved_unwind_states 146 // then we have to update m_curr_row and m_register_values based on 147 // the saved values. It 148 // is happenning after we processed an epilogue and a return to 149 // caller instruction. 150 if (it->second.first->GetOffset() != m_curr_row->GetOffset()) { 151 UnwindPlan::Row *newrow = new UnwindPlan::Row; 152 *newrow = *it->second.first; 153 m_curr_row.reset(newrow); 154 m_register_values = it->second.second; 155 } 156 157 m_inst_emulator_ap->SetInstruction( 158 inst->GetOpcode(), inst->GetAddress(), exe_ctx.GetTargetPtr()); 159 160 if (last_condition != 161 m_inst_emulator_ap->GetInstructionCondition()) { 162 if (m_inst_emulator_ap->GetInstructionCondition() != 163 EmulateInstruction::UnconditionalCondition && 164 saved_unwind_states.count(current_offset) == 0) { 165 // If we don't have a saved row for the current offset then save 166 // our 167 // current state because we will have to restore it after the 168 // conditional block. 169 auto new_row = 170 std::make_shared<UnwindPlan::Row>(*m_curr_row.get()); 171 saved_unwind_states.insert( 172 {current_offset, {new_row, m_register_values}}); 173 } 174 175 // If the last instruction was conditional with a different 176 // condition 177 // then the then current condition then restore the condition. 178 if (last_condition != 179 EmulateInstruction::UnconditionalCondition) { 180 const auto &saved_state = 181 saved_unwind_states.at(condition_block_start_offset); 182 m_curr_row = 183 std::make_shared<UnwindPlan::Row>(*saved_state.first); 184 m_curr_row->SetOffset(current_offset); 185 m_register_values = saved_state.second; 186 bool replace_existing = 187 true; // The last instruction might already 188 // created a row for this offset and 189 // we want to overwrite it. 190 unwind_plan.InsertRow( 191 std::make_shared<UnwindPlan::Row>(*m_curr_row), 192 replace_existing); 193 } 194 195 // We are starting a new conditional block at the catual offset 196 condition_block_start_offset = current_offset; 197 } 198 199 if (log && log->GetVerbose()) { 200 StreamString strm; 201 lldb_private::FormatEntity::Entry format; 202 FormatEntity::Parse("${frame.pc}: ", format); 203 inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize(), show_address, 204 show_bytes, NULL, NULL, NULL, &format, 0); 205 log->PutCString(strm.GetData()); 206 } 207 208 last_condition = m_inst_emulator_ap->GetInstructionCondition(); 209 210 m_inst_emulator_ap->EvaluateInstruction( 211 eEmulateInstructionOptionIgnoreConditions); 212 213 // If the current instruction is a branch forward then save the 214 // current CFI information 215 // for the offset where we are branching. 216 if (m_forward_branch_offset != 0 && 217 range.ContainsFileAddress(inst->GetAddress().GetFileAddress() + 218 m_forward_branch_offset)) { 219 auto newrow = 220 std::make_shared<UnwindPlan::Row>(*m_curr_row.get()); 221 newrow->SetOffset(current_offset + m_forward_branch_offset); 222 saved_unwind_states.insert( 223 {current_offset + m_forward_branch_offset, 224 {newrow, m_register_values}}); 225 unwind_plan.InsertRow(newrow); 226 } 227 228 // Were there any changes to the CFI while evaluating this 229 // instruction? 230 if (m_curr_row_modified) { 231 // Save the modified row if we don't already have a CFI row in the 232 // currennt address 233 if (saved_unwind_states.count( 234 current_offset + inst->GetOpcode().GetByteSize()) == 0) { 235 m_curr_row->SetOffset(current_offset + 236 inst->GetOpcode().GetByteSize()); 237 unwind_plan.InsertRow(m_curr_row); 238 saved_unwind_states.insert( 239 {current_offset + inst->GetOpcode().GetByteSize(), 240 {m_curr_row, m_register_values}}); 241 242 // Allocate a new Row for m_curr_row, copy the current state 243 // into it 244 UnwindPlan::Row *newrow = new UnwindPlan::Row; 245 *newrow = *m_curr_row.get(); 246 m_curr_row.reset(newrow); 247 } 248 } 249 } 250 } 251 } 252 } 253 254 if (log && log->GetVerbose()) { 255 StreamString strm; 256 lldb::addr_t base_addr = 257 range.GetBaseAddress().GetLoadAddress(thread.CalculateTarget().get()); 258 strm.Printf("Resulting unwind rows for [0x%" PRIx64 " - 0x%" PRIx64 "):", 259 base_addr, base_addr + range.GetByteSize()); 260 unwind_plan.Dump(strm, &thread, base_addr); 261 log->PutCString(strm.GetData()); 262 } 263 return unwind_plan.GetRowCount() > 0; 264 } 265 return false; 266 } 267 268 bool UnwindAssemblyInstEmulation::AugmentUnwindPlanFromCallSite( 269 AddressRange &func, Thread &thread, UnwindPlan &unwind_plan) { 270 return false; 271 } 272 273 bool UnwindAssemblyInstEmulation::GetFastUnwindPlan(AddressRange &func, 274 Thread &thread, 275 UnwindPlan &unwind_plan) { 276 return false; 277 } 278 279 bool UnwindAssemblyInstEmulation::FirstNonPrologueInsn( 280 AddressRange &func, const ExecutionContext &exe_ctx, 281 Address &first_non_prologue_insn) { 282 return false; 283 } 284 285 UnwindAssembly * 286 UnwindAssemblyInstEmulation::CreateInstance(const ArchSpec &arch) { 287 std::unique_ptr<EmulateInstruction> inst_emulator_ap( 288 EmulateInstruction::FindPlugin(arch, eInstructionTypePrologueEpilogue, 289 NULL)); 290 // Make sure that all prologue instructions are handled 291 if (inst_emulator_ap.get()) 292 return new UnwindAssemblyInstEmulation(arch, inst_emulator_ap.release()); 293 return NULL; 294 } 295 296 //------------------------------------------------------------------ 297 // PluginInterface protocol in UnwindAssemblyParser_x86 298 //------------------------------------------------------------------ 299 ConstString UnwindAssemblyInstEmulation::GetPluginName() { 300 return GetPluginNameStatic(); 301 } 302 303 uint32_t UnwindAssemblyInstEmulation::GetPluginVersion() { return 1; } 304 305 void UnwindAssemblyInstEmulation::Initialize() { 306 PluginManager::RegisterPlugin(GetPluginNameStatic(), 307 GetPluginDescriptionStatic(), CreateInstance); 308 } 309 310 void UnwindAssemblyInstEmulation::Terminate() { 311 PluginManager::UnregisterPlugin(CreateInstance); 312 } 313 314 ConstString UnwindAssemblyInstEmulation::GetPluginNameStatic() { 315 static ConstString g_name("inst-emulation"); 316 return g_name; 317 } 318 319 const char *UnwindAssemblyInstEmulation::GetPluginDescriptionStatic() { 320 return "Instruction emulation based unwind information."; 321 } 322 323 uint64_t UnwindAssemblyInstEmulation::MakeRegisterKindValuePair( 324 const RegisterInfo ®_info) { 325 lldb::RegisterKind reg_kind; 326 uint32_t reg_num; 327 if (EmulateInstruction::GetBestRegisterKindAndNumber(®_info, reg_kind, 328 reg_num)) 329 return (uint64_t)reg_kind << 24 | reg_num; 330 return 0ull; 331 } 332 333 void UnwindAssemblyInstEmulation::SetRegisterValue( 334 const RegisterInfo ®_info, const RegisterValue ®_value) { 335 m_register_values[MakeRegisterKindValuePair(reg_info)] = reg_value; 336 } 337 338 bool UnwindAssemblyInstEmulation::GetRegisterValue(const RegisterInfo ®_info, 339 RegisterValue ®_value) { 340 const uint64_t reg_id = MakeRegisterKindValuePair(reg_info); 341 RegisterValueMap::const_iterator pos = m_register_values.find(reg_id); 342 if (pos != m_register_values.end()) { 343 reg_value = pos->second; 344 return true; // We had a real value that comes from an opcode that wrote 345 // to it... 346 } 347 // We are making up a value that is recognizable... 348 reg_value.SetUInt(reg_id, reg_info.byte_size); 349 return false; 350 } 351 352 size_t UnwindAssemblyInstEmulation::ReadMemory( 353 EmulateInstruction *instruction, void *baton, 354 const EmulateInstruction::Context &context, lldb::addr_t addr, void *dst, 355 size_t dst_len) { 356 Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND)); 357 358 if (log && log->GetVerbose()) { 359 StreamString strm; 360 strm.Printf( 361 "UnwindAssemblyInstEmulation::ReadMemory (addr = 0x%16.16" PRIx64 362 ", dst = %p, dst_len = %" PRIu64 ", context = ", 363 addr, dst, (uint64_t)dst_len); 364 context.Dump(strm, instruction); 365 log->PutCString(strm.GetData()); 366 } 367 memset(dst, 0, dst_len); 368 return dst_len; 369 } 370 371 size_t UnwindAssemblyInstEmulation::WriteMemory( 372 EmulateInstruction *instruction, void *baton, 373 const EmulateInstruction::Context &context, lldb::addr_t addr, 374 const void *dst, size_t dst_len) { 375 if (baton && dst && dst_len) 376 return ((UnwindAssemblyInstEmulation *)baton) 377 ->WriteMemory(instruction, context, addr, dst, dst_len); 378 return 0; 379 } 380 381 size_t UnwindAssemblyInstEmulation::WriteMemory( 382 EmulateInstruction *instruction, const EmulateInstruction::Context &context, 383 lldb::addr_t addr, const void *dst, size_t dst_len) { 384 DataExtractor data(dst, dst_len, 385 instruction->GetArchitecture().GetByteOrder(), 386 instruction->GetArchitecture().GetAddressByteSize()); 387 388 Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND)); 389 390 if (log && log->GetVerbose()) { 391 StreamString strm; 392 393 strm.PutCString("UnwindAssemblyInstEmulation::WriteMemory ("); 394 data.Dump(&strm, 0, eFormatBytes, 1, dst_len, UINT32_MAX, addr, 0, 0); 395 strm.PutCString(", context = "); 396 context.Dump(strm, instruction); 397 log->PutCString(strm.GetData()); 398 } 399 400 const bool cant_replace = false; 401 402 switch (context.type) { 403 default: 404 case EmulateInstruction::eContextInvalid: 405 case EmulateInstruction::eContextReadOpcode: 406 case EmulateInstruction::eContextImmediate: 407 case EmulateInstruction::eContextAdjustBaseRegister: 408 case EmulateInstruction::eContextRegisterPlusOffset: 409 case EmulateInstruction::eContextAdjustPC: 410 case EmulateInstruction::eContextRegisterStore: 411 case EmulateInstruction::eContextRegisterLoad: 412 case EmulateInstruction::eContextRelativeBranchImmediate: 413 case EmulateInstruction::eContextAbsoluteBranchRegister: 414 case EmulateInstruction::eContextSupervisorCall: 415 case EmulateInstruction::eContextTableBranchReadMemory: 416 case EmulateInstruction::eContextWriteRegisterRandomBits: 417 case EmulateInstruction::eContextWriteMemoryRandomBits: 418 case EmulateInstruction::eContextArithmetic: 419 case EmulateInstruction::eContextAdvancePC: 420 case EmulateInstruction::eContextReturnFromException: 421 case EmulateInstruction::eContextPopRegisterOffStack: 422 case EmulateInstruction::eContextAdjustStackPointer: 423 break; 424 425 case EmulateInstruction::eContextPushRegisterOnStack: { 426 uint32_t reg_num = LLDB_INVALID_REGNUM; 427 uint32_t generic_regnum = LLDB_INVALID_REGNUM; 428 if (context.info_type == 429 EmulateInstruction::eInfoTypeRegisterToRegisterPlusOffset) { 430 const uint32_t unwind_reg_kind = m_unwind_plan_ptr->GetRegisterKind(); 431 reg_num = context.info.RegisterToRegisterPlusOffset.data_reg 432 .kinds[unwind_reg_kind]; 433 generic_regnum = context.info.RegisterToRegisterPlusOffset.data_reg 434 .kinds[eRegisterKindGeneric]; 435 } else 436 assert(!"unhandled case, add code to handle this!"); 437 438 if (reg_num != LLDB_INVALID_REGNUM && 439 generic_regnum != LLDB_REGNUM_GENERIC_SP) { 440 if (m_pushed_regs.find(reg_num) == m_pushed_regs.end()) { 441 m_pushed_regs[reg_num] = addr; 442 const int32_t offset = addr - m_initial_sp; 443 m_curr_row->SetRegisterLocationToAtCFAPlusOffset(reg_num, offset, 444 cant_replace); 445 m_curr_row_modified = true; 446 } 447 } 448 } break; 449 } 450 451 return dst_len; 452 } 453 454 bool UnwindAssemblyInstEmulation::ReadRegister(EmulateInstruction *instruction, 455 void *baton, 456 const RegisterInfo *reg_info, 457 RegisterValue ®_value) { 458 459 if (baton && reg_info) 460 return ((UnwindAssemblyInstEmulation *)baton) 461 ->ReadRegister(instruction, reg_info, reg_value); 462 return false; 463 } 464 bool UnwindAssemblyInstEmulation::ReadRegister(EmulateInstruction *instruction, 465 const RegisterInfo *reg_info, 466 RegisterValue ®_value) { 467 bool synthetic = GetRegisterValue(*reg_info, reg_value); 468 469 Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND)); 470 471 if (log && log->GetVerbose()) { 472 473 StreamString strm; 474 strm.Printf("UnwindAssemblyInstEmulation::ReadRegister (name = \"%s\") => " 475 "synthetic_value = %i, value = ", 476 reg_info->name, synthetic); 477 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 478 log->PutCString(strm.GetData()); 479 } 480 return true; 481 } 482 483 bool UnwindAssemblyInstEmulation::WriteRegister( 484 EmulateInstruction *instruction, void *baton, 485 const EmulateInstruction::Context &context, const RegisterInfo *reg_info, 486 const RegisterValue ®_value) { 487 if (baton && reg_info) 488 return ((UnwindAssemblyInstEmulation *)baton) 489 ->WriteRegister(instruction, context, reg_info, reg_value); 490 return false; 491 } 492 bool UnwindAssemblyInstEmulation::WriteRegister( 493 EmulateInstruction *instruction, const EmulateInstruction::Context &context, 494 const RegisterInfo *reg_info, const RegisterValue ®_value) { 495 Log *log(GetLogIfAllCategoriesSet(LIBLLDB_LOG_UNWIND)); 496 497 if (log && log->GetVerbose()) { 498 499 StreamString strm; 500 strm.Printf( 501 "UnwindAssemblyInstEmulation::WriteRegister (name = \"%s\", value = ", 502 reg_info->name); 503 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 504 strm.PutCString(", context = "); 505 context.Dump(strm, instruction); 506 log->PutCString(strm.GetData()); 507 } 508 509 SetRegisterValue(*reg_info, reg_value); 510 511 switch (context.type) { 512 case EmulateInstruction::eContextInvalid: 513 case EmulateInstruction::eContextReadOpcode: 514 case EmulateInstruction::eContextImmediate: 515 case EmulateInstruction::eContextAdjustBaseRegister: 516 case EmulateInstruction::eContextRegisterPlusOffset: 517 case EmulateInstruction::eContextAdjustPC: 518 case EmulateInstruction::eContextRegisterStore: 519 case EmulateInstruction::eContextSupervisorCall: 520 case EmulateInstruction::eContextTableBranchReadMemory: 521 case EmulateInstruction::eContextWriteRegisterRandomBits: 522 case EmulateInstruction::eContextWriteMemoryRandomBits: 523 case EmulateInstruction::eContextAdvancePC: 524 case EmulateInstruction::eContextReturnFromException: 525 case EmulateInstruction::eContextPushRegisterOnStack: 526 case EmulateInstruction::eContextRegisterLoad: 527 // { 528 // const uint32_t reg_num = 529 // reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 530 // if (reg_num != LLDB_INVALID_REGNUM) 531 // { 532 // const bool can_replace_only_if_unspecified = true; 533 // 534 // m_curr_row.SetRegisterLocationToUndefined (reg_num, 535 // can_replace_only_if_unspecified, 536 // can_replace_only_if_unspecified); 537 // m_curr_row_modified = true; 538 // } 539 // } 540 break; 541 542 case EmulateInstruction::eContextArithmetic: { 543 // If we adjusted the current frame pointer by a constant then adjust the 544 // CFA offset 545 // with the same amount. 546 lldb::RegisterKind kind = m_unwind_plan_ptr->GetRegisterKind(); 547 if (m_fp_is_cfa && reg_info->kinds[kind] == m_cfa_reg_info.kinds[kind] && 548 context.info_type == EmulateInstruction::eInfoTypeRegisterPlusOffset && 549 context.info.RegisterPlusOffset.reg.kinds[kind] == 550 m_cfa_reg_info.kinds[kind]) { 551 const int64_t offset = context.info.RegisterPlusOffset.signed_offset; 552 m_curr_row->GetCFAValue().IncOffset(-1 * offset); 553 m_curr_row_modified = true; 554 } 555 } break; 556 557 case EmulateInstruction::eContextAbsoluteBranchRegister: 558 case EmulateInstruction::eContextRelativeBranchImmediate: { 559 if (context.info_type == EmulateInstruction::eInfoTypeISAAndImmediate && 560 context.info.ISAAndImmediate.unsigned_data32 > 0) { 561 m_forward_branch_offset = 562 context.info.ISAAndImmediateSigned.signed_data32; 563 } else if (context.info_type == 564 EmulateInstruction::eInfoTypeISAAndImmediateSigned && 565 context.info.ISAAndImmediateSigned.signed_data32 > 0) { 566 m_forward_branch_offset = context.info.ISAAndImmediate.unsigned_data32; 567 } else if (context.info_type == EmulateInstruction::eInfoTypeImmediate && 568 context.info.unsigned_immediate > 0) { 569 m_forward_branch_offset = context.info.unsigned_immediate; 570 } else if (context.info_type == 571 EmulateInstruction::eInfoTypeImmediateSigned && 572 context.info.signed_immediate > 0) { 573 m_forward_branch_offset = context.info.signed_immediate; 574 } 575 } break; 576 577 case EmulateInstruction::eContextPopRegisterOffStack: { 578 const uint32_t reg_num = 579 reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 580 const uint32_t generic_regnum = reg_info->kinds[eRegisterKindGeneric]; 581 if (reg_num != LLDB_INVALID_REGNUM && 582 generic_regnum != LLDB_REGNUM_GENERIC_SP) { 583 switch (context.info_type) { 584 case EmulateInstruction::eInfoTypeAddress: 585 if (m_pushed_regs.find(reg_num) != m_pushed_regs.end() && 586 context.info.address == m_pushed_regs[reg_num]) { 587 m_curr_row->SetRegisterLocationToSame(reg_num, 588 false /*must_replace*/); 589 m_curr_row_modified = true; 590 } 591 break; 592 case EmulateInstruction::eInfoTypeISA: 593 assert( 594 (generic_regnum == LLDB_REGNUM_GENERIC_PC || 595 generic_regnum == LLDB_REGNUM_GENERIC_FLAGS) && 596 "eInfoTypeISA used for poping a register other the the PC/FLAGS"); 597 if (generic_regnum != LLDB_REGNUM_GENERIC_FLAGS) { 598 m_curr_row->SetRegisterLocationToSame(reg_num, 599 false /*must_replace*/); 600 m_curr_row_modified = true; 601 } 602 break; 603 default: 604 assert(false && "unhandled case, add code to handle this!"); 605 break; 606 } 607 } 608 } break; 609 610 case EmulateInstruction::eContextSetFramePointer: 611 if (!m_fp_is_cfa) { 612 m_fp_is_cfa = true; 613 m_cfa_reg_info = *reg_info; 614 const uint32_t cfa_reg_num = 615 reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 616 assert(cfa_reg_num != LLDB_INVALID_REGNUM); 617 m_curr_row->GetCFAValue().SetIsRegisterPlusOffset( 618 cfa_reg_num, m_initial_sp - reg_value.GetAsUInt64()); 619 m_curr_row_modified = true; 620 } 621 break; 622 623 case EmulateInstruction::eContextAdjustStackPointer: 624 // If we have created a frame using the frame pointer, don't follow 625 // subsequent adjustments to the stack pointer. 626 if (!m_fp_is_cfa) { 627 m_curr_row->GetCFAValue().SetIsRegisterPlusOffset( 628 m_curr_row->GetCFAValue().GetRegisterNumber(), 629 m_initial_sp - reg_value.GetAsUInt64()); 630 m_curr_row_modified = true; 631 } 632 break; 633 } 634 return true; 635 } 636