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; }
int main(int argc, char **argv){ int whichConfig=0; uint64 tempTime=0; whichConfig=atoi(argv[1]); //Select configuration and read it switch(whichConfig){ case BASE: printf("Using Base Config\n"); Config::readConfigFile("./configs/parametersBase.conf"); break; case L12WAY: printf("Using L1 2-Way Config\n"); Config::readConfigFile("./configs/parametersL12.conf"); break; case L22WAY: printf("Using L2 2-Way Config\n"); Config::readConfigFile("./configs/parametersL22.conf"); break; case ALL2WAY: printf("Using All 2-way Config\n"); Config::readConfigFile("./configs/parametersAll2.conf"); break; case L12WAYL24WAY: printf("Using L12WAYL24WAY Config\n"); Config::readConfigFile("./configs/parametersL12L24.conf"); break; case L2BIG: printf("Using L2BIG Config\n"); Config::readConfigFile("./configs/parametersL2Big.conf"); break; case ALLFA: printf("Using ALL FA Config\n"); Config::readConfigFile("./configs/parametersAllFA.conf"); break; default: printf("Invalid Configuration File Number:%d\n",whichConfig); break; } //Create caches based on configuration Cache* L1I = Cache::CreateCache(Cache::CL_L1I, L1_cache_size, L1_block_size, L1_assoc); Cache* L1D = Cache::CreateCache(Cache::CL_L1D, L1_cache_size, L1_block_size, L1_assoc); Cache* L2 = Cache::CreateCache(Cache::CL_L2, L2_cache_size, L2_block_size, L2_assoc); //Open trace file & instantiate instruction and result vectors Trace::OpenTraceFile(INPUTTRACE); Instruction* instr = new Instruction(); Results* results = new Results(); //Deal with command line arguments if (argc < 2) printBool=false; else if(argv[2] != NULL){ if (atoi(argv[2]) == 1) printBool=true; } printf("Status of printing: %s\n",BoolToString(printBool)); //Start simulation and keep running until end of trace file while (Trace::GetInstruction(instr, results) == 0){ tempTime=results->GetExecTime(); if (printBool == true) Trace::PrintInstruction(instr); Simulator::HandleInstruction(instr, L1I, L1D, L2, results); tempTime=results->GetExecTime()-tempTime; results->AddCycleCount(instr->GetOpcode(),tempTime); if (printBool == true) printf("Simulated Time = %llu\n",results->GetExecTime()); } //Save results vector to output file & exit results->PrintResults(); return 0; }