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 "lldb/Core/Address.h" 13 #include "lldb/Core/ArchSpec.h" 14 #include "lldb/Core/DataBufferHeap.h" 15 #include "lldb/Core/DataExtractor.h" 16 #include "lldb/Core/Disassembler.h" 17 #include "lldb/Core/Error.h" 18 #include "lldb/Core/Log.h" 19 #include "lldb/Core/PluginManager.h" 20 #include "lldb/Core/StreamString.h" 21 #include "lldb/Target/ExecutionContext.h" 22 #include "lldb/Target/Process.h" 23 #include "lldb/Target/Thread.h" 24 #include "lldb/Target/Target.h" 25 26 using namespace lldb; 27 using namespace lldb_private; 28 29 30 31 //----------------------------------------------------------------------------------------------- 32 // UnwindAssemblyInstEmulation method definitions 33 //----------------------------------------------------------------------------------------------- 34 35 bool 36 UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly (AddressRange& range, 37 Thread& thread, 38 UnwindPlan& unwind_plan) 39 { 40 if (range.GetByteSize() > 0 && 41 range.GetBaseAddress().IsValid() && 42 m_inst_emulator_ap.get()) 43 { 44 45 // The the instruction emulation subclass setup the unwind plan for the 46 // first instruction. 47 m_inst_emulator_ap->CreateFunctionEntryUnwind (unwind_plan); 48 49 // CreateFunctionEntryUnwind should have created the first row. If it 50 // doesn't, then we are done. 51 if (unwind_plan.GetRowCount() == 0) 52 return false; 53 54 ExecutionContext exe_ctx; 55 thread.CalculateExecutionContext(exe_ctx); 56 DisassemblerSP disasm_sp (Disassembler::DisassembleRange (m_arch, 57 NULL, 58 NULL, 59 exe_ctx, 60 range)); 61 62 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 63 64 if (disasm_sp) 65 { 66 67 m_range_ptr = ⦥ 68 m_thread_ptr = &thread; 69 m_unwind_plan_ptr = &unwind_plan; 70 71 const uint32_t addr_byte_size = m_arch.GetAddressByteSize(); 72 const bool show_address = true; 73 const bool show_bytes = true; 74 m_inst_emulator_ap->GetRegisterInfo (unwind_plan.GetRegisterKind(), 75 unwind_plan.GetInitialCFARegister(), 76 m_cfa_reg_info); 77 78 m_fp_is_cfa = false; 79 m_register_values.clear(); 80 m_pushed_regs.clear(); 81 82 // Initialize the CFA with a known value. In the 32 bit case 83 // it will be 0x80000000, and in the 64 bit case 0x8000000000000000. 84 // We use the address byte size to be safe for any future addresss sizes 85 m_initial_sp = (1ull << ((addr_byte_size * 8) - 1)); 86 RegisterValue cfa_reg_value; 87 cfa_reg_value.SetUInt (m_initial_sp, m_cfa_reg_info.byte_size); 88 SetRegisterValue (m_cfa_reg_info, cfa_reg_value); 89 90 const InstructionList &inst_list = disasm_sp->GetInstructionList (); 91 const size_t num_instructions = inst_list.GetSize(); 92 93 if (num_instructions > 0) 94 { 95 Instruction *inst = inst_list.GetInstructionAtIndex (0).get(); 96 const addr_t base_addr = inst->GetAddress().GetFileAddress(); 97 98 // Make a copy of the current instruction Row and save it in m_curr_row 99 // so we can add updates as we process the instructions. 100 UnwindPlan::RowSP last_row = unwind_plan.GetLastRow(); 101 UnwindPlan::Row *newrow = new UnwindPlan::Row; 102 if (last_row.get()) 103 *newrow = *last_row.get(); 104 m_curr_row.reset(newrow); 105 106 // Once we've seen the initial prologue instructions complete, save a 107 // copy of the CFI at that point into prologue_completed_row for possible 108 // use later. 109 int instructions_since_last_prologue_insn = 0; // # of insns since last CFI was update 110 111 bool reinstate_prologue_next_instruction = false; // Next iteration, re-install the prologue row of CFI 112 113 bool last_instruction_restored_return_addr_reg = false; // re-install the prologue row of CFI if the next instruction is a branch immediate 114 115 bool return_address_register_has_been_saved = false; // if we've seen the ra register get saved yet 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 m_curr_insn_restored_a_register = false; 141 inst = inst_list.GetInstructionAtIndex (idx).get(); 142 if (inst) 143 { 144 if (log && log->GetVerbose ()) 145 { 146 StreamString strm; 147 inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize (), show_address, show_bytes, NULL); 148 log->PutCString (strm.GetData()); 149 } 150 151 m_inst_emulator_ap->SetInstruction (inst->GetOpcode(), 152 inst->GetAddress(), 153 exe_ctx.GetTargetPtr()); 154 155 m_inst_emulator_ap->EvaluateInstruction (eEmulateInstructionOptionIgnoreConditions); 156 157 // Were there any changes to the CFI while evaluating this instruction? 158 if (m_curr_row_modified) 159 { 160 reinstate_prologue_next_instruction = false; 161 m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); 162 // Append the new row 163 unwind_plan.AppendRow (m_curr_row); 164 165 // Allocate a new Row for m_curr_row, copy the current state into it 166 UnwindPlan::Row *newrow = new UnwindPlan::Row; 167 *newrow = *m_curr_row.get(); 168 m_curr_row.reset(newrow); 169 170 // If m_curr_insn_restored_a_register == true, we're looking at an epilogue instruction. 171 // Set instructions_since_last_prologue_insn to a very high number so we don't append 172 // any of these epilogue instructions to our prologue_complete row. 173 if (m_curr_insn_restored_a_register == false && instructions_since_last_prologue_insn < 8) 174 instructions_since_last_prologue_insn = 0; 175 else 176 instructions_since_last_prologue_insn = 99; 177 178 UnwindPlan::Row::RegisterLocation pc_regloc; 179 UnwindPlan::Row::RegisterLocation ra_regloc; 180 181 // While parsing the instructions of this function, if we've ever 182 // seen the return address register (aka lr on arm) in a non-IsSame() state, 183 // it has been saved on the stack. If it's evern back to IsSame(), we've 184 // executed an epilogue. 185 if (ra_reg_num != LLDB_INVALID_REGNUM 186 && m_curr_row->GetRegisterInfo (ra_reg_num, ra_regloc) 187 && !ra_regloc.IsSame()) 188 { 189 return_address_register_has_been_saved = true; 190 } 191 192 // If the caller's pc is "same", we've just executed an epilogue and we return to the caller 193 // after this instruction completes executing. 194 // If there are any instructions past this, there must have been flow control over this 195 // epilogue so we'll reinstate the original prologue setup instructions. 196 if (prologue_completed_row.get() 197 && pc_reg_num != LLDB_INVALID_REGNUM 198 && m_curr_row->GetRegisterInfo (pc_reg_num, pc_regloc) 199 && pc_regloc.IsSame()) 200 { 201 if (log && log->GetVerbose()) 202 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- pc is <same>, restore prologue instructions."); 203 reinstate_prologue_next_instruction = true; 204 } 205 else if (prologue_completed_row.get() 206 && return_address_register_has_been_saved 207 && ra_reg_num != LLDB_INVALID_REGNUM 208 && m_curr_row->GetRegisterInfo (ra_reg_num, ra_regloc) 209 && ra_regloc.IsSame()) 210 { 211 if (log && log->GetVerbose()) 212 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- lr is <same>, restore prologue instruction if the next instruction is a branch immediate."); 213 last_instruction_restored_return_addr_reg = true; 214 } 215 } 216 else 217 { 218 // If the previous instruction was a return-to-caller (epilogue), and we're still executing 219 // instructions in this function, there must be a code path that jumps over that epilogue. 220 // Also detect the case where we epilogue & branch imm to another function (tail-call opt) 221 // instead of a normal pop lr-into-pc exit. 222 // Reinstate the frame setup from the prologue. 223 if (reinstate_prologue_next_instruction 224 || (m_curr_insn_is_branch_immediate && last_instruction_restored_return_addr_reg)) 225 { 226 if (log && log->GetVerbose()) 227 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- Reinstating prologue instruction set"); 228 UnwindPlan::Row *newrow = new UnwindPlan::Row; 229 *newrow = *prologue_completed_row.get(); 230 m_curr_row.reset(newrow); 231 m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); 232 unwind_plan.AppendRow(m_curr_row); 233 234 newrow = new UnwindPlan::Row; 235 *newrow = *m_curr_row.get(); 236 m_curr_row.reset(newrow); 237 238 reinstate_prologue_next_instruction = false; 239 last_instruction_restored_return_addr_reg = false; 240 m_curr_insn_is_branch_immediate = false; 241 } 242 243 // clear both of these if either one wasn't set 244 if (last_instruction_restored_return_addr_reg) 245 { 246 last_instruction_restored_return_addr_reg = false; 247 } 248 if (m_curr_insn_is_branch_immediate) 249 { 250 m_curr_insn_is_branch_immediate = false; 251 } 252 253 // Stop updating the prologue instructions if we've seen 8 non-prologue instructions 254 // in a row. 255 if (instructions_since_last_prologue_insn++ < 8) 256 { 257 UnwindPlan::Row *newrow = new UnwindPlan::Row; 258 *newrow = *m_curr_row.get(); 259 prologue_completed_row.reset(newrow); 260 if (log && log->GetVerbose()) 261 log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- saving a copy of the current row as the prologue row."); 262 } 263 } 264 } 265 } 266 } 267 // FIXME: The DisassemblerLLVMC has a reference cycle and won't go away if it has any active instructions. 268 // I'll fix that but for now, just clear the list and it will go away nicely. 269 disasm_sp->GetInstructionList().Clear(); 270 } 271 272 if (log && log->GetVerbose ()) 273 { 274 StreamString strm; 275 lldb::addr_t base_addr = range.GetBaseAddress().GetLoadAddress(thread.CalculateTarget().get()); 276 strm.Printf ("Resulting unwind rows for [0x%" PRIx64 " - 0x%" PRIx64 "):", base_addr, base_addr + range.GetByteSize()); 277 unwind_plan.Dump(strm, &thread, base_addr); 278 log->PutCString (strm.GetData()); 279 } 280 return unwind_plan.GetRowCount() > 0; 281 } 282 return false; 283 } 284 285 bool 286 UnwindAssemblyInstEmulation::GetFastUnwindPlan (AddressRange& func, 287 Thread& thread, 288 UnwindPlan &unwind_plan) 289 { 290 return false; 291 } 292 293 bool 294 UnwindAssemblyInstEmulation::FirstNonPrologueInsn (AddressRange& func, 295 const ExecutionContext &exe_ctx, 296 Address& first_non_prologue_insn) 297 { 298 return false; 299 } 300 301 UnwindAssembly * 302 UnwindAssemblyInstEmulation::CreateInstance (const ArchSpec &arch) 303 { 304 std::unique_ptr<EmulateInstruction> inst_emulator_ap (EmulateInstruction::FindPlugin (arch, eInstructionTypePrologueEpilogue, NULL)); 305 // Make sure that all prologue instructions are handled 306 if (inst_emulator_ap.get()) 307 return new UnwindAssemblyInstEmulation (arch, inst_emulator_ap.release()); 308 return NULL; 309 } 310 311 312 //------------------------------------------------------------------ 313 // PluginInterface protocol in UnwindAssemblyParser_x86 314 //------------------------------------------------------------------ 315 ConstString 316 UnwindAssemblyInstEmulation::GetPluginName() 317 { 318 return GetPluginNameStatic(); 319 } 320 321 uint32_t 322 UnwindAssemblyInstEmulation::GetPluginVersion() 323 { 324 return 1; 325 } 326 327 void 328 UnwindAssemblyInstEmulation::Initialize() 329 { 330 PluginManager::RegisterPlugin (GetPluginNameStatic(), 331 GetPluginDescriptionStatic(), 332 CreateInstance); 333 } 334 335 void 336 UnwindAssemblyInstEmulation::Terminate() 337 { 338 PluginManager::UnregisterPlugin (CreateInstance); 339 } 340 341 342 ConstString 343 UnwindAssemblyInstEmulation::GetPluginNameStatic() 344 { 345 static ConstString g_name("inst-emulation"); 346 return g_name; 347 } 348 349 const char * 350 UnwindAssemblyInstEmulation::GetPluginDescriptionStatic() 351 { 352 return "Instruction emulation based unwind information."; 353 } 354 355 356 uint64_t 357 UnwindAssemblyInstEmulation::MakeRegisterKindValuePair (const RegisterInfo ®_info) 358 { 359 uint32_t reg_kind, reg_num; 360 if (EmulateInstruction::GetBestRegisterKindAndNumber (®_info, reg_kind, reg_num)) 361 return (uint64_t)reg_kind << 24 | reg_num; 362 return 0ull; 363 } 364 365 void 366 UnwindAssemblyInstEmulation::SetRegisterValue (const RegisterInfo ®_info, const RegisterValue ®_value) 367 { 368 m_register_values[MakeRegisterKindValuePair (reg_info)] = reg_value; 369 } 370 371 bool 372 UnwindAssemblyInstEmulation::GetRegisterValue (const RegisterInfo ®_info, RegisterValue ®_value) 373 { 374 const uint64_t reg_id = MakeRegisterKindValuePair (reg_info); 375 RegisterValueMap::const_iterator pos = m_register_values.find(reg_id); 376 if (pos != m_register_values.end()) 377 { 378 reg_value = pos->second; 379 return true; // We had a real value that comes from an opcode that wrote 380 // to it... 381 } 382 // We are making up a value that is recognizable... 383 reg_value.SetUInt(reg_id, reg_info.byte_size); 384 return false; 385 } 386 387 388 size_t 389 UnwindAssemblyInstEmulation::ReadMemory (EmulateInstruction *instruction, 390 void *baton, 391 const EmulateInstruction::Context &context, 392 lldb::addr_t addr, 393 void *dst, 394 size_t dst_len) 395 { 396 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 397 398 if (log && log->GetVerbose ()) 399 { 400 StreamString strm; 401 strm.Printf ("UnwindAssemblyInstEmulation::ReadMemory (addr = 0x%16.16" PRIx64 ", dst = %p, dst_len = %" PRIu64 ", context = ", 402 addr, 403 dst, 404 (uint64_t)dst_len); 405 context.Dump(strm, instruction); 406 log->PutCString (strm.GetData ()); 407 } 408 memset (dst, 0, dst_len); 409 return dst_len; 410 } 411 412 size_t 413 UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, 414 void *baton, 415 const EmulateInstruction::Context &context, 416 lldb::addr_t addr, 417 const void *dst, 418 size_t dst_len) 419 { 420 if (baton && dst && dst_len) 421 return ((UnwindAssemblyInstEmulation *)baton)->WriteMemory (instruction, context, addr, dst, dst_len); 422 return 0; 423 } 424 425 size_t 426 UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, 427 const EmulateInstruction::Context &context, 428 lldb::addr_t addr, 429 const void *dst, 430 size_t dst_len) 431 { 432 DataExtractor data (dst, 433 dst_len, 434 instruction->GetArchitecture ().GetByteOrder(), 435 instruction->GetArchitecture ().GetAddressByteSize()); 436 437 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 438 439 if (log && log->GetVerbose ()) 440 { 441 StreamString strm; 442 443 strm.PutCString ("UnwindAssemblyInstEmulation::WriteMemory ("); 444 data.Dump(&strm, 0, eFormatBytes, 1, dst_len, UINT32_MAX, addr, 0, 0); 445 strm.PutCString (", context = "); 446 context.Dump(strm, instruction); 447 log->PutCString (strm.GetData()); 448 } 449 450 const bool can_replace = true; 451 const bool cant_replace = false; 452 453 switch (context.type) 454 { 455 default: 456 case EmulateInstruction::eContextInvalid: 457 case EmulateInstruction::eContextReadOpcode: 458 case EmulateInstruction::eContextImmediate: 459 case EmulateInstruction::eContextAdjustBaseRegister: 460 case EmulateInstruction::eContextRegisterPlusOffset: 461 case EmulateInstruction::eContextAdjustPC: 462 case EmulateInstruction::eContextRegisterStore: 463 case EmulateInstruction::eContextRegisterLoad: 464 case EmulateInstruction::eContextRelativeBranchImmediate: 465 case EmulateInstruction::eContextAbsoluteBranchRegister: 466 case EmulateInstruction::eContextSupervisorCall: 467 case EmulateInstruction::eContextTableBranchReadMemory: 468 case EmulateInstruction::eContextWriteRegisterRandomBits: 469 case EmulateInstruction::eContextWriteMemoryRandomBits: 470 case EmulateInstruction::eContextArithmetic: 471 case EmulateInstruction::eContextAdvancePC: 472 case EmulateInstruction::eContextReturnFromException: 473 case EmulateInstruction::eContextPopRegisterOffStack: 474 case EmulateInstruction::eContextAdjustStackPointer: 475 break; 476 477 case EmulateInstruction::eContextPushRegisterOnStack: 478 { 479 uint32_t reg_num = LLDB_INVALID_REGNUM; 480 bool is_return_address_reg = false; 481 const uint32_t unwind_reg_kind = m_unwind_plan_ptr->GetRegisterKind(); 482 if (context.info_type == EmulateInstruction::eInfoTypeRegisterToRegisterPlusOffset) 483 { 484 reg_num = context.info.RegisterToRegisterPlusOffset.data_reg.kinds[unwind_reg_kind]; 485 if (context.info.RegisterToRegisterPlusOffset.data_reg.kinds[eRegisterKindGeneric] == LLDB_REGNUM_GENERIC_RA) 486 is_return_address_reg = true; 487 } 488 else 489 { 490 assert (!"unhandled case, add code to handle this!"); 491 } 492 493 if (reg_num != LLDB_INVALID_REGNUM) 494 { 495 if (m_pushed_regs.find (reg_num) == m_pushed_regs.end()) 496 { 497 m_pushed_regs[reg_num] = addr; 498 const int32_t offset = addr - m_initial_sp; 499 m_curr_row->SetRegisterLocationToAtCFAPlusOffset (reg_num, offset, cant_replace); 500 m_curr_row_modified = true; 501 if (is_return_address_reg) 502 { 503 // This push was pushing the return address register, 504 // so this is also how we will unwind the PC... 505 RegisterInfo pc_reg_info; 506 if (instruction->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info)) 507 { 508 uint32_t pc_reg_num = pc_reg_info.kinds[unwind_reg_kind]; 509 if (pc_reg_num != LLDB_INVALID_REGNUM) 510 { 511 m_curr_row->SetRegisterLocationToAtCFAPlusOffset (pc_reg_num, offset, can_replace); 512 m_curr_row_modified = true; 513 } 514 } 515 } 516 } 517 } 518 } 519 break; 520 521 } 522 523 return dst_len; 524 } 525 526 bool 527 UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, 528 void *baton, 529 const RegisterInfo *reg_info, 530 RegisterValue ®_value) 531 { 532 533 if (baton && reg_info) 534 return ((UnwindAssemblyInstEmulation *)baton)->ReadRegister (instruction, reg_info, reg_value); 535 return false; 536 } 537 bool 538 UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, 539 const RegisterInfo *reg_info, 540 RegisterValue ®_value) 541 { 542 bool synthetic = GetRegisterValue (*reg_info, reg_value); 543 544 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 545 546 if (log && log->GetVerbose ()) 547 { 548 549 StreamString strm; 550 strm.Printf ("UnwindAssemblyInstEmulation::ReadRegister (name = \"%s\") => synthetic_value = %i, value = ", reg_info->name, synthetic); 551 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 552 log->PutCString(strm.GetData()); 553 } 554 return true; 555 } 556 557 bool 558 UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, 559 void *baton, 560 const EmulateInstruction::Context &context, 561 const RegisterInfo *reg_info, 562 const RegisterValue ®_value) 563 { 564 if (baton && reg_info) 565 return ((UnwindAssemblyInstEmulation *)baton)->WriteRegister (instruction, context, reg_info, reg_value); 566 return false; 567 } 568 bool 569 UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, 570 const EmulateInstruction::Context &context, 571 const RegisterInfo *reg_info, 572 const RegisterValue ®_value) 573 { 574 Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); 575 576 if (log && log->GetVerbose ()) 577 { 578 579 StreamString strm; 580 strm.Printf ("UnwindAssemblyInstEmulation::WriteRegister (name = \"%s\", value = ", reg_info->name); 581 reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); 582 strm.PutCString (", context = "); 583 context.Dump(strm, instruction); 584 log->PutCString(strm.GetData()); 585 } 586 587 const bool must_replace = true; 588 SetRegisterValue (*reg_info, reg_value); 589 590 switch (context.type) 591 { 592 case EmulateInstruction::eContextInvalid: 593 case EmulateInstruction::eContextReadOpcode: 594 case EmulateInstruction::eContextImmediate: 595 case EmulateInstruction::eContextAdjustBaseRegister: 596 case EmulateInstruction::eContextRegisterPlusOffset: 597 case EmulateInstruction::eContextAdjustPC: 598 case EmulateInstruction::eContextRegisterStore: 599 case EmulateInstruction::eContextRegisterLoad: 600 case EmulateInstruction::eContextAbsoluteBranchRegister: 601 case EmulateInstruction::eContextSupervisorCall: 602 case EmulateInstruction::eContextTableBranchReadMemory: 603 case EmulateInstruction::eContextWriteRegisterRandomBits: 604 case EmulateInstruction::eContextWriteMemoryRandomBits: 605 case EmulateInstruction::eContextArithmetic: 606 case EmulateInstruction::eContextAdvancePC: 607 case EmulateInstruction::eContextReturnFromException: 608 case EmulateInstruction::eContextPushRegisterOnStack: 609 // { 610 // const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 611 // if (reg_num != LLDB_INVALID_REGNUM) 612 // { 613 // const bool can_replace_only_if_unspecified = true; 614 // 615 // m_curr_row.SetRegisterLocationToUndefined (reg_num, 616 // can_replace_only_if_unspecified, 617 // can_replace_only_if_unspecified); 618 // m_curr_row_modified = true; 619 // } 620 // } 621 break; 622 623 case EmulateInstruction::eContextRelativeBranchImmediate: 624 { 625 626 { 627 m_curr_insn_is_branch_immediate = true; 628 } 629 } 630 break; 631 632 case EmulateInstruction::eContextPopRegisterOffStack: 633 { 634 const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 635 if (reg_num != LLDB_INVALID_REGNUM) 636 { 637 m_curr_row->SetRegisterLocationToSame (reg_num, must_replace); 638 m_curr_row_modified = true; 639 m_curr_insn_restored_a_register = true; 640 } 641 } 642 break; 643 644 case EmulateInstruction::eContextSetFramePointer: 645 if (!m_fp_is_cfa) 646 { 647 m_fp_is_cfa = true; 648 m_cfa_reg_info = *reg_info; 649 const uint32_t cfa_reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; 650 assert (cfa_reg_num != LLDB_INVALID_REGNUM); 651 m_curr_row->SetCFARegister(cfa_reg_num); 652 m_curr_row->SetCFAOffset(m_initial_sp - reg_value.GetAsUInt64()); 653 m_curr_row_modified = true; 654 } 655 break; 656 657 case EmulateInstruction::eContextAdjustStackPointer: 658 // If we have created a frame using the frame pointer, don't follow 659 // subsequent adjustments to the stack pointer. 660 if (!m_fp_is_cfa) 661 { 662 m_curr_row->SetCFAOffset (m_initial_sp - reg_value.GetAsUInt64()); 663 m_curr_row_modified = true; 664 } 665 break; 666 } 667 return true; 668 } 669 670 671
