| //===-- UnwindAssemblyInstEmulation.cpp --------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "UnwindAssemblyInstEmulation.h" |
| |
| #include "lldb/Core/Address.h" |
| #include "lldb/Core/ArchSpec.h" |
| #include "lldb/Core/DataBufferHeap.h" |
| #include "lldb/Core/DataExtractor.h" |
| #include "lldb/Core/Disassembler.h" |
| #include "lldb/Core/Error.h" |
| #include "lldb/Core/Log.h" |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/StreamString.h" |
| #include "lldb/Target/ExecutionContext.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Target/Target.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| |
| |
| //----------------------------------------------------------------------------------------------- |
| // UnwindAssemblyInstEmulation method definitions |
| //----------------------------------------------------------------------------------------------- |
| |
| bool |
| UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly (AddressRange& range, |
| Thread& thread, |
| UnwindPlan& unwind_plan) |
| { |
| if (range.GetByteSize() > 0 && |
| range.GetBaseAddress().IsValid() && |
| m_inst_emulator_ap.get()) |
| { |
| |
| // The instruction emulation subclass setup the unwind plan for the |
| // first instruction. |
| m_inst_emulator_ap->CreateFunctionEntryUnwind (unwind_plan); |
| |
| // CreateFunctionEntryUnwind should have created the first row. If it |
| // doesn't, then we are done. |
| if (unwind_plan.GetRowCount() == 0) |
| return false; |
| |
| ExecutionContext exe_ctx; |
| thread.CalculateExecutionContext(exe_ctx); |
| const bool prefer_file_cache = true; |
| DisassemblerSP disasm_sp (Disassembler::DisassembleRange (m_arch, |
| NULL, |
| NULL, |
| exe_ctx, |
| range, |
| prefer_file_cache)); |
| |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (disasm_sp) |
| { |
| |
| m_range_ptr = ⦥ |
| m_thread_ptr = &thread; |
| m_unwind_plan_ptr = &unwind_plan; |
| |
| const uint32_t addr_byte_size = m_arch.GetAddressByteSize(); |
| const bool show_address = true; |
| const bool show_bytes = true; |
| m_inst_emulator_ap->GetRegisterInfo (unwind_plan.GetRegisterKind(), |
| unwind_plan.GetInitialCFARegister(), |
| m_cfa_reg_info); |
| |
| m_fp_is_cfa = false; |
| m_register_values.clear(); |
| m_pushed_regs.clear(); |
| |
| // Initialize the CFA with a known value. In the 32 bit case |
| // it will be 0x80000000, and in the 64 bit case 0x8000000000000000. |
| // We use the address byte size to be safe for any future address sizes |
| m_initial_sp = (1ull << ((addr_byte_size * 8) - 1)); |
| RegisterValue cfa_reg_value; |
| cfa_reg_value.SetUInt (m_initial_sp, m_cfa_reg_info.byte_size); |
| SetRegisterValue (m_cfa_reg_info, cfa_reg_value); |
| |
| const InstructionList &inst_list = disasm_sp->GetInstructionList (); |
| const size_t num_instructions = inst_list.GetSize(); |
| |
| if (num_instructions > 0) |
| { |
| Instruction *inst = inst_list.GetInstructionAtIndex (0).get(); |
| const addr_t base_addr = inst->GetAddress().GetFileAddress(); |
| |
| // Make a copy of the current instruction Row and save it in m_curr_row |
| // so we can add updates as we process the instructions. |
| UnwindPlan::RowSP last_row = unwind_plan.GetLastRow(); |
| UnwindPlan::Row *newrow = new UnwindPlan::Row; |
| if (last_row.get()) |
| *newrow = *last_row.get(); |
| m_curr_row.reset(newrow); |
| |
| // Once we've seen the initial prologue instructions complete, save a |
| // copy of the CFI at that point into prologue_completed_row for possible |
| // use later. |
| int instructions_since_last_prologue_insn = 0; // # of insns since last CFI was update |
| |
| bool reinstate_prologue_next_instruction = false; // Next iteration, re-install the prologue row of CFI |
| |
| bool last_instruction_restored_return_addr_reg = false; // re-install the prologue row of CFI if the next instruction is a branch immediate |
| |
| bool return_address_register_has_been_saved = false; // if we've seen the ra register get saved yet |
| |
| UnwindPlan::RowSP prologue_completed_row; // copy of prologue row of CFI |
| |
| // cache the pc register number (in whatever register numbering this UnwindPlan uses) for |
| // quick reference during instruction parsing. |
| uint32_t pc_reg_num = LLDB_INVALID_REGNUM; |
| RegisterInfo pc_reg_info; |
| if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info)) |
| pc_reg_num = pc_reg_info.kinds[unwind_plan.GetRegisterKind()]; |
| else |
| pc_reg_num = LLDB_INVALID_REGNUM; |
| |
| // cache the return address register number (in whatever register numbering this UnwindPlan uses) for |
| // quick reference during instruction parsing. |
| uint32_t ra_reg_num = LLDB_INVALID_REGNUM; |
| RegisterInfo ra_reg_info; |
| if (m_inst_emulator_ap->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA, ra_reg_info)) |
| ra_reg_num = ra_reg_info.kinds[unwind_plan.GetRegisterKind()]; |
| else |
| ra_reg_num = LLDB_INVALID_REGNUM; |
| |
| for (size_t idx=0; idx<num_instructions; ++idx) |
| { |
| m_curr_row_modified = false; |
| m_curr_insn_restored_a_register = false; |
| inst = inst_list.GetInstructionAtIndex (idx).get(); |
| if (inst) |
| { |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| inst->Dump(&strm, inst_list.GetMaxOpcocdeByteSize (), show_address, show_bytes, NULL); |
| log->PutCString (strm.GetData()); |
| } |
| |
| m_inst_emulator_ap->SetInstruction (inst->GetOpcode(), |
| inst->GetAddress(), |
| exe_ctx.GetTargetPtr()); |
| |
| m_inst_emulator_ap->EvaluateInstruction (eEmulateInstructionOptionIgnoreConditions); |
| |
| // Were there any changes to the CFI while evaluating this instruction? |
| if (m_curr_row_modified) |
| { |
| reinstate_prologue_next_instruction = false; |
| m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); |
| // Append the new row |
| unwind_plan.AppendRow (m_curr_row); |
| |
| // Allocate a new Row for m_curr_row, copy the current state into it |
| UnwindPlan::Row *newrow = new UnwindPlan::Row; |
| *newrow = *m_curr_row.get(); |
| m_curr_row.reset(newrow); |
| |
| // If m_curr_insn_restored_a_register == true, we're looking at an epilogue instruction. |
| // Set instructions_since_last_prologue_insn to a very high number so we don't append |
| // any of these epilogue instructions to our prologue_complete row. |
| if (m_curr_insn_restored_a_register == false && instructions_since_last_prologue_insn < 8) |
| instructions_since_last_prologue_insn = 0; |
| else |
| instructions_since_last_prologue_insn = 99; |
| |
| UnwindPlan::Row::RegisterLocation pc_regloc; |
| UnwindPlan::Row::RegisterLocation ra_regloc; |
| |
| // While parsing the instructions of this function, if we've ever |
| // seen the return address register (aka lr on arm) in a non-IsSame() state, |
| // it has been saved on the stack. If it's ever back to IsSame(), we've |
| // executed an epilogue. |
| if (ra_reg_num != LLDB_INVALID_REGNUM |
| && m_curr_row->GetRegisterInfo (ra_reg_num, ra_regloc) |
| && !ra_regloc.IsSame()) |
| { |
| return_address_register_has_been_saved = true; |
| } |
| |
| // If the caller's pc is "same", we've just executed an epilogue and we return to the caller |
| // after this instruction completes executing. |
| // If there are any instructions past this, there must have been flow control over this |
| // epilogue so we'll reinstate the original prologue setup instructions. |
| if (prologue_completed_row.get() |
| && pc_reg_num != LLDB_INVALID_REGNUM |
| && m_curr_row->GetRegisterInfo (pc_reg_num, pc_regloc) |
| && pc_regloc.IsSame()) |
| { |
| if (log && log->GetVerbose()) |
| log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- pc is <same>, restore prologue instructions."); |
| reinstate_prologue_next_instruction = true; |
| } |
| else if (prologue_completed_row.get() |
| && return_address_register_has_been_saved |
| && ra_reg_num != LLDB_INVALID_REGNUM |
| && m_curr_row->GetRegisterInfo (ra_reg_num, ra_regloc) |
| && ra_regloc.IsSame()) |
| { |
| if (log && log->GetVerbose()) |
| log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- lr is <same>, restore prologue instruction if the next instruction is a branch immediate."); |
| last_instruction_restored_return_addr_reg = true; |
| } |
| } |
| else |
| { |
| // If the previous instruction was a return-to-caller (epilogue), and we're still executing |
| // instructions in this function, there must be a code path that jumps over that epilogue. |
| // Also detect the case where we epilogue & branch imm to another function (tail-call opt) |
| // instead of a normal pop lr-into-pc exit. |
| // Reinstate the frame setup from the prologue. |
| if (reinstate_prologue_next_instruction |
| || (m_curr_insn_is_branch_immediate && last_instruction_restored_return_addr_reg)) |
| { |
| if (log && log->GetVerbose()) |
| log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- Reinstating prologue instruction set"); |
| UnwindPlan::Row *newrow = new UnwindPlan::Row; |
| *newrow = *prologue_completed_row.get(); |
| m_curr_row.reset(newrow); |
| m_curr_row->SetOffset (inst->GetAddress().GetFileAddress() + inst->GetOpcode().GetByteSize() - base_addr); |
| unwind_plan.AppendRow(m_curr_row); |
| |
| newrow = new UnwindPlan::Row; |
| *newrow = *m_curr_row.get(); |
| m_curr_row.reset(newrow); |
| |
| reinstate_prologue_next_instruction = false; |
| last_instruction_restored_return_addr_reg = false; |
| m_curr_insn_is_branch_immediate = false; |
| } |
| |
| // clear both of these if either one wasn't set |
| if (last_instruction_restored_return_addr_reg) |
| { |
| last_instruction_restored_return_addr_reg = false; |
| } |
| if (m_curr_insn_is_branch_immediate) |
| { |
| m_curr_insn_is_branch_immediate = false; |
| } |
| |
| // Stop updating the prologue instructions if we've seen 8 non-prologue instructions |
| // in a row. |
| if (instructions_since_last_prologue_insn++ < 8) |
| { |
| UnwindPlan::Row *newrow = new UnwindPlan::Row; |
| *newrow = *m_curr_row.get(); |
| prologue_completed_row.reset(newrow); |
| if (log && log->GetVerbose()) |
| log->Printf("UnwindAssemblyInstEmulation::GetNonCallSiteUnwindPlanFromAssembly -- saving a copy of the current row as the prologue row."); |
| } |
| } |
| } |
| } |
| } |
| // FIXME: The DisassemblerLLVMC has a reference cycle and won't go away if it has any active instructions. |
| // I'll fix that but for now, just clear the list and it will go away nicely. |
| disasm_sp->GetInstructionList().Clear(); |
| } |
| |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| lldb::addr_t base_addr = range.GetBaseAddress().GetLoadAddress(thread.CalculateTarget().get()); |
| strm.Printf ("Resulting unwind rows for [0x%" PRIx64 " - 0x%" PRIx64 "):", base_addr, base_addr + range.GetByteSize()); |
| unwind_plan.Dump(strm, &thread, base_addr); |
| log->PutCString (strm.GetData()); |
| } |
| return unwind_plan.GetRowCount() > 0; |
| } |
| return false; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::GetFastUnwindPlan (AddressRange& func, |
| Thread& thread, |
| UnwindPlan &unwind_plan) |
| { |
| return false; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::FirstNonPrologueInsn (AddressRange& func, |
| const ExecutionContext &exe_ctx, |
| Address& first_non_prologue_insn) |
| { |
| return false; |
| } |
| |
| UnwindAssembly * |
| UnwindAssemblyInstEmulation::CreateInstance (const ArchSpec &arch) |
| { |
| std::unique_ptr<EmulateInstruction> inst_emulator_ap (EmulateInstruction::FindPlugin (arch, eInstructionTypePrologueEpilogue, NULL)); |
| // Make sure that all prologue instructions are handled |
| if (inst_emulator_ap.get()) |
| return new UnwindAssemblyInstEmulation (arch, inst_emulator_ap.release()); |
| return NULL; |
| } |
| |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol in UnwindAssemblyParser_x86 |
| //------------------------------------------------------------------ |
| ConstString |
| UnwindAssemblyInstEmulation::GetPluginName() |
| { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t |
| UnwindAssemblyInstEmulation::GetPluginVersion() |
| { |
| return 1; |
| } |
| |
| void |
| UnwindAssemblyInstEmulation::Initialize() |
| { |
| PluginManager::RegisterPlugin (GetPluginNameStatic(), |
| GetPluginDescriptionStatic(), |
| CreateInstance); |
| } |
| |
| void |
| UnwindAssemblyInstEmulation::Terminate() |
| { |
| PluginManager::UnregisterPlugin (CreateInstance); |
| } |
| |
| |
| ConstString |
| UnwindAssemblyInstEmulation::GetPluginNameStatic() |
| { |
| static ConstString g_name("inst-emulation"); |
| return g_name; |
| } |
| |
| const char * |
| UnwindAssemblyInstEmulation::GetPluginDescriptionStatic() |
| { |
| return "Instruction emulation based unwind information."; |
| } |
| |
| |
| uint64_t |
| UnwindAssemblyInstEmulation::MakeRegisterKindValuePair (const RegisterInfo ®_info) |
| { |
| lldb::RegisterKind reg_kind; |
| uint32_t reg_num; |
| if (EmulateInstruction::GetBestRegisterKindAndNumber (®_info, reg_kind, reg_num)) |
| return (uint64_t)reg_kind << 24 | reg_num; |
| return 0ull; |
| } |
| |
| void |
| UnwindAssemblyInstEmulation::SetRegisterValue (const RegisterInfo ®_info, const RegisterValue ®_value) |
| { |
| m_register_values[MakeRegisterKindValuePair (reg_info)] = reg_value; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::GetRegisterValue (const RegisterInfo ®_info, RegisterValue ®_value) |
| { |
| const uint64_t reg_id = MakeRegisterKindValuePair (reg_info); |
| RegisterValueMap::const_iterator pos = m_register_values.find(reg_id); |
| if (pos != m_register_values.end()) |
| { |
| reg_value = pos->second; |
| return true; // We had a real value that comes from an opcode that wrote |
| // to it... |
| } |
| // We are making up a value that is recognizable... |
| reg_value.SetUInt(reg_id, reg_info.byte_size); |
| return false; |
| } |
| |
| |
| size_t |
| UnwindAssemblyInstEmulation::ReadMemory (EmulateInstruction *instruction, |
| void *baton, |
| const EmulateInstruction::Context &context, |
| lldb::addr_t addr, |
| void *dst, |
| size_t dst_len) |
| { |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| strm.Printf ("UnwindAssemblyInstEmulation::ReadMemory (addr = 0x%16.16" PRIx64 ", dst = %p, dst_len = %" PRIu64 ", context = ", |
| addr, |
| dst, |
| (uint64_t)dst_len); |
| context.Dump(strm, instruction); |
| log->PutCString (strm.GetData ()); |
| } |
| memset (dst, 0, dst_len); |
| return dst_len; |
| } |
| |
| size_t |
| UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, |
| void *baton, |
| const EmulateInstruction::Context &context, |
| lldb::addr_t addr, |
| const void *dst, |
| size_t dst_len) |
| { |
| if (baton && dst && dst_len) |
| return ((UnwindAssemblyInstEmulation *)baton)->WriteMemory (instruction, context, addr, dst, dst_len); |
| return 0; |
| } |
| |
| size_t |
| UnwindAssemblyInstEmulation::WriteMemory (EmulateInstruction *instruction, |
| const EmulateInstruction::Context &context, |
| lldb::addr_t addr, |
| const void *dst, |
| size_t dst_len) |
| { |
| DataExtractor data (dst, |
| dst_len, |
| instruction->GetArchitecture ().GetByteOrder(), |
| instruction->GetArchitecture ().GetAddressByteSize()); |
| |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| StreamString strm; |
| |
| strm.PutCString ("UnwindAssemblyInstEmulation::WriteMemory ("); |
| data.Dump(&strm, 0, eFormatBytes, 1, dst_len, UINT32_MAX, addr, 0, 0); |
| strm.PutCString (", context = "); |
| context.Dump(strm, instruction); |
| log->PutCString (strm.GetData()); |
| } |
| |
| const bool can_replace = true; |
| const bool cant_replace = false; |
| |
| switch (context.type) |
| { |
| default: |
| case EmulateInstruction::eContextInvalid: |
| case EmulateInstruction::eContextReadOpcode: |
| case EmulateInstruction::eContextImmediate: |
| case EmulateInstruction::eContextAdjustBaseRegister: |
| case EmulateInstruction::eContextRegisterPlusOffset: |
| case EmulateInstruction::eContextAdjustPC: |
| case EmulateInstruction::eContextRegisterStore: |
| case EmulateInstruction::eContextRegisterLoad: |
| case EmulateInstruction::eContextRelativeBranchImmediate: |
| case EmulateInstruction::eContextAbsoluteBranchRegister: |
| case EmulateInstruction::eContextSupervisorCall: |
| case EmulateInstruction::eContextTableBranchReadMemory: |
| case EmulateInstruction::eContextWriteRegisterRandomBits: |
| case EmulateInstruction::eContextWriteMemoryRandomBits: |
| case EmulateInstruction::eContextArithmetic: |
| case EmulateInstruction::eContextAdvancePC: |
| case EmulateInstruction::eContextReturnFromException: |
| case EmulateInstruction::eContextPopRegisterOffStack: |
| case EmulateInstruction::eContextAdjustStackPointer: |
| break; |
| |
| case EmulateInstruction::eContextPushRegisterOnStack: |
| { |
| uint32_t reg_num = LLDB_INVALID_REGNUM; |
| bool is_return_address_reg = false; |
| const uint32_t unwind_reg_kind = m_unwind_plan_ptr->GetRegisterKind(); |
| if (context.info_type == EmulateInstruction::eInfoTypeRegisterToRegisterPlusOffset) |
| { |
| reg_num = context.info.RegisterToRegisterPlusOffset.data_reg.kinds[unwind_reg_kind]; |
| if (context.info.RegisterToRegisterPlusOffset.data_reg.kinds[eRegisterKindGeneric] == LLDB_REGNUM_GENERIC_RA) |
| is_return_address_reg = true; |
| } |
| else |
| { |
| assert (!"unhandled case, add code to handle this!"); |
| } |
| |
| if (reg_num != LLDB_INVALID_REGNUM) |
| { |
| if (m_pushed_regs.find (reg_num) == m_pushed_regs.end()) |
| { |
| m_pushed_regs[reg_num] = addr; |
| const int32_t offset = addr - m_initial_sp; |
| m_curr_row->SetRegisterLocationToAtCFAPlusOffset (reg_num, offset, cant_replace); |
| m_curr_row_modified = true; |
| if (is_return_address_reg) |
| { |
| // This push was pushing the return address register, |
| // so this is also how we will unwind the PC... |
| RegisterInfo pc_reg_info; |
| if (instruction->GetRegisterInfo (eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC, pc_reg_info)) |
| { |
| uint32_t pc_reg_num = pc_reg_info.kinds[unwind_reg_kind]; |
| if (pc_reg_num != LLDB_INVALID_REGNUM) |
| { |
| m_curr_row->SetRegisterLocationToAtCFAPlusOffset (pc_reg_num, offset, can_replace); |
| m_curr_row_modified = true; |
| } |
| } |
| } |
| } |
| } |
| } |
| break; |
| |
| } |
| |
| return dst_len; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, |
| void *baton, |
| const RegisterInfo *reg_info, |
| RegisterValue ®_value) |
| { |
| |
| if (baton && reg_info) |
| return ((UnwindAssemblyInstEmulation *)baton)->ReadRegister (instruction, reg_info, reg_value); |
| return false; |
| } |
| bool |
| UnwindAssemblyInstEmulation::ReadRegister (EmulateInstruction *instruction, |
| const RegisterInfo *reg_info, |
| RegisterValue ®_value) |
| { |
| bool synthetic = GetRegisterValue (*reg_info, reg_value); |
| |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| |
| StreamString strm; |
| strm.Printf ("UnwindAssemblyInstEmulation::ReadRegister (name = \"%s\") => synthetic_value = %i, value = ", reg_info->name, synthetic); |
| reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); |
| log->PutCString(strm.GetData()); |
| } |
| return true; |
| } |
| |
| bool |
| UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, |
| void *baton, |
| const EmulateInstruction::Context &context, |
| const RegisterInfo *reg_info, |
| const RegisterValue ®_value) |
| { |
| if (baton && reg_info) |
| return ((UnwindAssemblyInstEmulation *)baton)->WriteRegister (instruction, context, reg_info, reg_value); |
| return false; |
| } |
| bool |
| UnwindAssemblyInstEmulation::WriteRegister (EmulateInstruction *instruction, |
| const EmulateInstruction::Context &context, |
| const RegisterInfo *reg_info, |
| const RegisterValue ®_value) |
| { |
| Log *log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| |
| if (log && log->GetVerbose ()) |
| { |
| |
| StreamString strm; |
| strm.Printf ("UnwindAssemblyInstEmulation::WriteRegister (name = \"%s\", value = ", reg_info->name); |
| reg_value.Dump(&strm, reg_info, false, false, eFormatDefault); |
| strm.PutCString (", context = "); |
| context.Dump(strm, instruction); |
| log->PutCString(strm.GetData()); |
| } |
| |
| const bool must_replace = true; |
| SetRegisterValue (*reg_info, reg_value); |
| |
| switch (context.type) |
| { |
| case EmulateInstruction::eContextInvalid: |
| case EmulateInstruction::eContextReadOpcode: |
| case EmulateInstruction::eContextImmediate: |
| case EmulateInstruction::eContextAdjustBaseRegister: |
| case EmulateInstruction::eContextRegisterPlusOffset: |
| case EmulateInstruction::eContextAdjustPC: |
| case EmulateInstruction::eContextRegisterStore: |
| case EmulateInstruction::eContextRegisterLoad: |
| case EmulateInstruction::eContextAbsoluteBranchRegister: |
| case EmulateInstruction::eContextSupervisorCall: |
| case EmulateInstruction::eContextTableBranchReadMemory: |
| case EmulateInstruction::eContextWriteRegisterRandomBits: |
| case EmulateInstruction::eContextWriteMemoryRandomBits: |
| case EmulateInstruction::eContextArithmetic: |
| case EmulateInstruction::eContextAdvancePC: |
| case EmulateInstruction::eContextReturnFromException: |
| case EmulateInstruction::eContextPushRegisterOnStack: |
| // { |
| // const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; |
| // if (reg_num != LLDB_INVALID_REGNUM) |
| // { |
| // const bool can_replace_only_if_unspecified = true; |
| // |
| // m_curr_row.SetRegisterLocationToUndefined (reg_num, |
| // can_replace_only_if_unspecified, |
| // can_replace_only_if_unspecified); |
| // m_curr_row_modified = true; |
| // } |
| // } |
| break; |
| |
| case EmulateInstruction::eContextRelativeBranchImmediate: |
| { |
| |
| { |
| m_curr_insn_is_branch_immediate = true; |
| } |
| } |
| break; |
| |
| case EmulateInstruction::eContextPopRegisterOffStack: |
| { |
| const uint32_t reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; |
| if (reg_num != LLDB_INVALID_REGNUM) |
| { |
| m_curr_row->SetRegisterLocationToSame (reg_num, must_replace); |
| m_curr_row_modified = true; |
| m_curr_insn_restored_a_register = true; |
| } |
| } |
| break; |
| |
| case EmulateInstruction::eContextSetFramePointer: |
| if (!m_fp_is_cfa) |
| { |
| m_fp_is_cfa = true; |
| m_cfa_reg_info = *reg_info; |
| const uint32_t cfa_reg_num = reg_info->kinds[m_unwind_plan_ptr->GetRegisterKind()]; |
| assert (cfa_reg_num != LLDB_INVALID_REGNUM); |
| m_curr_row->SetCFARegister(cfa_reg_num); |
| m_curr_row->SetCFAOffset(m_initial_sp - reg_value.GetAsUInt64()); |
| m_curr_row_modified = true; |
| } |
| break; |
| |
| case EmulateInstruction::eContextAdjustStackPointer: |
| // If we have created a frame using the frame pointer, don't follow |
| // subsequent adjustments to the stack pointer. |
| if (!m_fp_is_cfa) |
| { |
| m_curr_row->SetCFAOffset (m_initial_sp - reg_value.GetAsUInt64()); |
| m_curr_row_modified = true; |
| } |
| break; |
| } |
| return true; |
| } |
| |
| |