contrib/llvm/tools/lldb/source/Symbol/FuncUnwinders.cpp

   1 //===-- FuncUnwinders.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 "lldb/Symbol/FuncUnwinders.h"
  11 #include "lldb/Core/Address.h"
  12 #include "lldb/Core/AddressRange.h"
  13 #include "lldb/Symbol/ArmUnwindInfo.h"
  14 #include "lldb/Symbol/CompactUnwindInfo.h"
  15 #include "lldb/Symbol/DWARFCallFrameInfo.h"
  16 #include "lldb/Symbol/ObjectFile.h"
  17 #include "lldb/Symbol/UnwindPlan.h"
  18 #include "lldb/Symbol/UnwindTable.h"
  19 #include "lldb/Target/ABI.h"
  20 #include "lldb/Target/ExecutionContext.h"
  21 #include "lldb/Target/Process.h"
  22 #include "lldb/Target/RegisterNumber.h"
  23 #include "lldb/Target/Target.h"
  24 #include "lldb/Target/Thread.h"
  25 #include "lldb/Target/UnwindAssembly.h"
  26
  27 using namespace lldb;
  28 using namespace lldb_private;
  29
  30 //------------------------------------------------
  31 /// constructor
  32 //------------------------------------------------
  33
  34 FuncUnwinders::FuncUnwinders(UnwindTable &unwind_table, AddressRange range)
  35     : m_unwind_table(unwind_table), m_range(range), m_mutex(),
  36       m_unwind_plan_assembly_sp(), m_unwind_plan_eh_frame_sp(),
  37       m_unwind_plan_eh_frame_augmented_sp(), m_unwind_plan_compact_unwind(),
  38       m_unwind_plan_arm_unwind_sp(), m_unwind_plan_fast_sp(),
  39       m_unwind_plan_arch_default_sp(),
  40       m_unwind_plan_arch_default_at_func_entry_sp(),
  41       m_tried_unwind_plan_assembly(false), m_tried_unwind_plan_eh_frame(false),
  42       m_tried_unwind_plan_debug_frame(false),
  43       m_tried_unwind_plan_eh_frame_augmented(false),
  44       m_tried_unwind_plan_debug_frame_augmented(false),
  45       m_tried_unwind_plan_compact_unwind(false),
  46       m_tried_unwind_plan_arm_unwind(false), m_tried_unwind_fast(false),
  47       m_tried_unwind_arch_default(false),
  48       m_tried_unwind_arch_default_at_func_entry(false),
  49       m_first_non_prologue_insn() {}
  50
  51 //------------------------------------------------
  52 /// destructor
  53 //------------------------------------------------
  54
  55 FuncUnwinders::~FuncUnwinders() {}
  56
  57 UnwindPlanSP FuncUnwinders::GetUnwindPlanAtCallSite(Target &target,
  58                                                     int current_offset) {
  59   std::lock_guard<std::recursive_mutex> guard(m_mutex);
  60
  61   if (UnwindPlanSP plan_sp = GetEHFrameUnwindPlan(target, current_offset))
  62     return plan_sp;
  63   if (UnwindPlanSP plan_sp = GetDebugFrameUnwindPlan(target, current_offset))
  64     return plan_sp;
  65   if (UnwindPlanSP plan_sp = GetCompactUnwindUnwindPlan(target, current_offset))
  66     return plan_sp;
  67   if (UnwindPlanSP plan_sp = GetArmUnwindUnwindPlan(target, current_offset))
  68     return plan_sp;
  69
  70   return nullptr;
  71 }
  72
  73 UnwindPlanSP FuncUnwinders::GetCompactUnwindUnwindPlan(Target &target,
  74                                                        int current_offset) {
  75   std::lock_guard<std::recursive_mutex> guard(m_mutex);
  76   if (m_unwind_plan_compact_unwind.size() > 0)
  77     return m_unwind_plan_compact_unwind[0]; // FIXME support multiple compact
  78                                             // unwind plans for one func
  79   if (m_tried_unwind_plan_compact_unwind)
  80     return UnwindPlanSP();
  81
  82   m_tried_unwind_plan_compact_unwind = true;
  83   if (m_range.GetBaseAddress().IsValid()) {
  84     Address current_pc(m_range.GetBaseAddress());
  85     if (current_offset != -1)
  86       current_pc.SetOffset(current_pc.GetOffset() + current_offset);
  87     CompactUnwindInfo *compact_unwind = m_unwind_table.GetCompactUnwindInfo();
  88     if (compact_unwind) {
  89       UnwindPlanSP unwind_plan_sp(new UnwindPlan(lldb::eRegisterKindGeneric));
  90       if (compact_unwind->GetUnwindPlan(target, current_pc, *unwind_plan_sp)) {
  91         m_unwind_plan_compact_unwind.push_back(unwind_plan_sp);
  92         return m_unwind_plan_compact_unwind[0]; // FIXME support multiple
  93                                                 // compact unwind plans for one
  94                                                 // func
  95       }
  96     }
  97   }
  98   return UnwindPlanSP();
  99 }
 100
 101 UnwindPlanSP FuncUnwinders::GetEHFrameUnwindPlan(Target &target,
 102                                                  int current_offset) {
 103   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 104   if (m_unwind_plan_eh_frame_sp.get() || m_tried_unwind_plan_eh_frame)
 105     return m_unwind_plan_eh_frame_sp;
 106
 107   m_tried_unwind_plan_eh_frame = true;
 108   if (m_range.GetBaseAddress().IsValid()) {
 109     Address current_pc(m_range.GetBaseAddress());
 110     if (current_offset != -1)
 111       current_pc.SetOffset(current_pc.GetOffset() + current_offset);
 112     DWARFCallFrameInfo *eh_frame = m_unwind_table.GetEHFrameInfo();
 113     if (eh_frame) {
 114       m_unwind_plan_eh_frame_sp.reset(
 115           new UnwindPlan(lldb::eRegisterKindGeneric));
 116       if (!eh_frame->GetUnwindPlan(current_pc, *m_unwind_plan_eh_frame_sp))
 117         m_unwind_plan_eh_frame_sp.reset();
 118     }
 119   }
 120   return m_unwind_plan_eh_frame_sp;
 121 }
 122
 123 UnwindPlanSP FuncUnwinders::GetDebugFrameUnwindPlan(Target &target,
 124                                                     int current_offset) {
 125   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 126   if (m_unwind_plan_debug_frame_sp || m_tried_unwind_plan_debug_frame)
 127     return m_unwind_plan_debug_frame_sp;
 128
 129   m_tried_unwind_plan_debug_frame = true;
 130   if (m_range.GetBaseAddress().IsValid()) {
 131     Address current_pc(m_range.GetBaseAddress());
 132     if (current_offset != -1)
 133       current_pc.SetOffset(current_pc.GetOffset() + current_offset);
 134     DWARFCallFrameInfo *debug_frame = m_unwind_table.GetDebugFrameInfo();
 135     if (debug_frame) {
 136       m_unwind_plan_debug_frame_sp.reset(
 137           new UnwindPlan(lldb::eRegisterKindGeneric));
 138       if (!debug_frame->GetUnwindPlan(current_pc,
 139                                       *m_unwind_plan_debug_frame_sp))
 140         m_unwind_plan_debug_frame_sp.reset();
 141     }
 142   }
 143   return m_unwind_plan_debug_frame_sp;
 144 }
 145
 146 UnwindPlanSP FuncUnwinders::GetArmUnwindUnwindPlan(Target &target,
 147                                                    int current_offset) {
 148   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 149   if (m_unwind_plan_arm_unwind_sp.get() || m_tried_unwind_plan_arm_unwind)
 150     return m_unwind_plan_arm_unwind_sp;
 151
 152   m_tried_unwind_plan_arm_unwind = true;
 153   if (m_range.GetBaseAddress().IsValid()) {
 154     Address current_pc(m_range.GetBaseAddress());
 155     if (current_offset != -1)
 156       current_pc.SetOffset(current_pc.GetOffset() + current_offset);
 157     ArmUnwindInfo *arm_unwind_info = m_unwind_table.GetArmUnwindInfo();
 158     if (arm_unwind_info) {
 159       m_unwind_plan_arm_unwind_sp.reset(
 160           new UnwindPlan(lldb::eRegisterKindGeneric));
 161       if (!arm_unwind_info->GetUnwindPlan(target, current_pc,
 162                                           *m_unwind_plan_arm_unwind_sp))
 163         m_unwind_plan_arm_unwind_sp.reset();
 164     }
 165   }
 166   return m_unwind_plan_arm_unwind_sp;
 167 }
 168
 169 UnwindPlanSP FuncUnwinders::GetEHFrameAugmentedUnwindPlan(Target &target,
 170                                                           Thread &thread,
 171                                                           int current_offset) {
 172   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 173   if (m_unwind_plan_eh_frame_augmented_sp.get() ||
 174       m_tried_unwind_plan_eh_frame_augmented)
 175     return m_unwind_plan_eh_frame_augmented_sp;
 176
 177   // Only supported on x86 architectures where we get eh_frame from the
 178   // compiler that describes the prologue instructions perfectly, and sometimes
 179   // the epilogue instructions too.
 180   if (target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_32_i386 &&
 181       target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64 &&
 182       target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64h) {
 183     m_tried_unwind_plan_eh_frame_augmented = true;
 184     return m_unwind_plan_eh_frame_augmented_sp;
 185   }
 186
 187   m_tried_unwind_plan_eh_frame_augmented = true;
 188
 189   UnwindPlanSP eh_frame_plan = GetEHFrameUnwindPlan(target, current_offset);
 190   if (!eh_frame_plan)
 191     return m_unwind_plan_eh_frame_augmented_sp;
 192
 193   m_unwind_plan_eh_frame_augmented_sp.reset(new UnwindPlan(*eh_frame_plan));
 194
 195   // Augment the eh_frame instructions with epilogue descriptions if necessary
 196   // so the UnwindPlan can be used at any instruction in the function.
 197
 198   UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
 199   if (assembly_profiler_sp) {
 200     if (!assembly_profiler_sp->AugmentUnwindPlanFromCallSite(
 201             m_range, thread, *m_unwind_plan_eh_frame_augmented_sp)) {
 202       m_unwind_plan_eh_frame_augmented_sp.reset();
 203     }
 204   } else {
 205     m_unwind_plan_eh_frame_augmented_sp.reset();
 206   }
 207   return m_unwind_plan_eh_frame_augmented_sp;
 208 }
 209
 210 UnwindPlanSP
 211 FuncUnwinders::GetDebugFrameAugmentedUnwindPlan(Target &target, Thread &thread,
 212                                                 int current_offset) {
 213   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 214   if (m_unwind_plan_debug_frame_augmented_sp.get() ||
 215       m_tried_unwind_plan_debug_frame_augmented)
 216     return m_unwind_plan_debug_frame_augmented_sp;
 217
 218   // Only supported on x86 architectures where we get debug_frame from the
 219   // compiler that describes the prologue instructions perfectly, and sometimes
 220   // the epilogue instructions too.
 221   if (target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_32_i386 &&
 222       target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64 &&
 223       target.GetArchitecture().GetCore() != ArchSpec::eCore_x86_64_x86_64h) {
 224     m_tried_unwind_plan_debug_frame_augmented = true;
 225     return m_unwind_plan_debug_frame_augmented_sp;
 226   }
 227
 228   m_tried_unwind_plan_debug_frame_augmented = true;
 229
 230   UnwindPlanSP debug_frame_plan =
 231       GetDebugFrameUnwindPlan(target, current_offset);
 232   if (!debug_frame_plan)
 233     return m_unwind_plan_debug_frame_augmented_sp;
 234
 235   m_unwind_plan_debug_frame_augmented_sp.reset(
 236       new UnwindPlan(*debug_frame_plan));
 237
 238   // Augment the debug_frame instructions with epilogue descriptions if
 239   // necessary so the UnwindPlan can be used at any instruction in the
 240   // function.
 241
 242   UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
 243   if (assembly_profiler_sp) {
 244     if (!assembly_profiler_sp->AugmentUnwindPlanFromCallSite(
 245             m_range, thread, *m_unwind_plan_debug_frame_augmented_sp)) {
 246       m_unwind_plan_debug_frame_augmented_sp.reset();
 247     }
 248   } else
 249     m_unwind_plan_debug_frame_augmented_sp.reset();
 250   return m_unwind_plan_debug_frame_augmented_sp;
 251 }
 252
 253 UnwindPlanSP FuncUnwinders::GetAssemblyUnwindPlan(Target &target,
 254                                                   Thread &thread,
 255                                                   int current_offset) {
 256   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 257   if (m_unwind_plan_assembly_sp.get() || m_tried_unwind_plan_assembly ||
 258       m_unwind_table.GetAllowAssemblyEmulationUnwindPlans() == false) {
 259     return m_unwind_plan_assembly_sp;
 260   }
 261
 262   m_tried_unwind_plan_assembly = true;
 263
 264   UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
 265   if (assembly_profiler_sp) {
 266     m_unwind_plan_assembly_sp.reset(new UnwindPlan(lldb::eRegisterKindGeneric));
 267     if (!assembly_profiler_sp->GetNonCallSiteUnwindPlanFromAssembly(
 268             m_range, thread, *m_unwind_plan_assembly_sp)) {
 269       m_unwind_plan_assembly_sp.reset();
 270     }
 271   }
 272   return m_unwind_plan_assembly_sp;
 273 }
 274
 275 // This method compares the pc unwind rule in the first row of two UnwindPlans.
 276 // If they have the same way of getting the pc value (e.g. "CFA - 8" + "CFA is
 277 // sp"), then it will return LazyBoolTrue.
 278 LazyBool FuncUnwinders::CompareUnwindPlansForIdenticalInitialPCLocation(
 279     Thread &thread, const UnwindPlanSP &a, const UnwindPlanSP &b) {
 280   LazyBool plans_are_identical = eLazyBoolCalculate;
 281
 282   RegisterNumber pc_reg(thread, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
 283   uint32_t pc_reg_lldb_regnum = pc_reg.GetAsKind(eRegisterKindLLDB);
 284
 285   if (a.get() && b.get()) {
 286     UnwindPlan::RowSP a_first_row = a->GetRowAtIndex(0);
 287     UnwindPlan::RowSP b_first_row = b->GetRowAtIndex(0);
 288
 289     if (a_first_row.get() && b_first_row.get()) {
 290       UnwindPlan::Row::RegisterLocation a_pc_regloc;
 291       UnwindPlan::Row::RegisterLocation b_pc_regloc;
 292
 293       a_first_row->GetRegisterInfo(pc_reg_lldb_regnum, a_pc_regloc);
 294       b_first_row->GetRegisterInfo(pc_reg_lldb_regnum, b_pc_regloc);
 295
 296       plans_are_identical = eLazyBoolYes;
 297
 298       if (a_first_row->GetCFAValue() != b_first_row->GetCFAValue()) {
 299         plans_are_identical = eLazyBoolNo;
 300       }
 301       if (a_pc_regloc != b_pc_regloc) {
 302         plans_are_identical = eLazyBoolNo;
 303       }
 304     }
 305   }
 306   return plans_are_identical;
 307 }
 308
 309 UnwindPlanSP FuncUnwinders::GetUnwindPlanAtNonCallSite(Target &target,
 310                                                        Thread &thread,
 311                                                        int current_offset) {
 312   UnwindPlanSP eh_frame_sp = GetEHFrameUnwindPlan(target, current_offset);
 313   if (!eh_frame_sp)
 314     eh_frame_sp = GetDebugFrameUnwindPlan(target, current_offset);
 315   UnwindPlanSP arch_default_at_entry_sp =
 316       GetUnwindPlanArchitectureDefaultAtFunctionEntry(thread);
 317   UnwindPlanSP arch_default_sp = GetUnwindPlanArchitectureDefault(thread);
 318   UnwindPlanSP assembly_sp =
 319       GetAssemblyUnwindPlan(target, thread, current_offset);
 320
 321   // This point of this code is to detect when a function is using a non-
 322   // standard ABI, and the eh_frame correctly describes that alternate ABI.
 323   // This is addressing a specific situation on x86_64 linux systems where one
 324   // function in a library pushes a value on the stack and jumps to another
 325   // function.  So using an assembly instruction based unwind will not work
 326   // when you're in the second function - the stack has been modified in a non-
 327   // ABI way.  But we have eh_frame that correctly describes how to unwind from
 328   // this location.  So we're looking to see if the initial pc register save
 329   // location from the eh_frame is different from the assembly unwind, the arch
 330   // default unwind, and the arch default at initial function entry.
 331   //
 332   // We may have eh_frame that describes the entire function -- or we may have
 333   // eh_frame that only describes the unwind after the prologue has executed --
 334   // so we need to check both the arch default (once the prologue has executed)
 335   // and the arch default at initial function entry.  And we may be running on
 336   // a target where we have only some of the assembly/arch default unwind plans
 337   // available.
 338
 339   if (CompareUnwindPlansForIdenticalInitialPCLocation(
 340           thread, eh_frame_sp, arch_default_at_entry_sp) == eLazyBoolNo &&
 341       CompareUnwindPlansForIdenticalInitialPCLocation(
 342           thread, eh_frame_sp, arch_default_sp) == eLazyBoolNo &&
 343       CompareUnwindPlansForIdenticalInitialPCLocation(
 344           thread, assembly_sp, arch_default_sp) == eLazyBoolNo) {
 345     return eh_frame_sp;
 346   }
 347
 348   if (UnwindPlanSP plan_sp =
 349           GetEHFrameAugmentedUnwindPlan(target, thread, current_offset))
 350     return plan_sp;
 351   if (UnwindPlanSP plan_sp =
 352           GetDebugFrameAugmentedUnwindPlan(target, thread, current_offset))
 353     return plan_sp;
 354
 355   return assembly_sp;
 356 }
 357
 358 UnwindPlanSP FuncUnwinders::GetUnwindPlanFastUnwind(Target &target,
 359                                                     Thread &thread) {
 360   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 361   if (m_unwind_plan_fast_sp.get() || m_tried_unwind_fast)
 362     return m_unwind_plan_fast_sp;
 363
 364   m_tried_unwind_fast = true;
 365
 366   UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
 367   if (assembly_profiler_sp) {
 368     m_unwind_plan_fast_sp.reset(new UnwindPlan(lldb::eRegisterKindGeneric));
 369     if (!assembly_profiler_sp->GetFastUnwindPlan(m_range, thread,
 370                                                  *m_unwind_plan_fast_sp)) {
 371       m_unwind_plan_fast_sp.reset();
 372     }
 373   }
 374   return m_unwind_plan_fast_sp;
 375 }
 376
 377 UnwindPlanSP FuncUnwinders::GetUnwindPlanArchitectureDefault(Thread &thread) {
 378   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 379   if (m_unwind_plan_arch_default_sp.get() || m_tried_unwind_arch_default)
 380     return m_unwind_plan_arch_default_sp;
 381
 382   m_tried_unwind_arch_default = true;
 383
 384   Address current_pc;
 385   ProcessSP process_sp(thread.CalculateProcess());
 386   if (process_sp) {
 387     ABI *abi = process_sp->GetABI().get();
 388     if (abi) {
 389       m_unwind_plan_arch_default_sp.reset(
 390           new UnwindPlan(lldb::eRegisterKindGeneric));
 391       if (!abi->CreateDefaultUnwindPlan(*m_unwind_plan_arch_default_sp)) {
 392         m_unwind_plan_arch_default_sp.reset();
 393       }
 394     }
 395   }
 396
 397   return m_unwind_plan_arch_default_sp;
 398 }
 399
 400 UnwindPlanSP
 401 FuncUnwinders::GetUnwindPlanArchitectureDefaultAtFunctionEntry(Thread &thread) {
 402   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 403   if (m_unwind_plan_arch_default_at_func_entry_sp.get() ||
 404       m_tried_unwind_arch_default_at_func_entry)
 405     return m_unwind_plan_arch_default_at_func_entry_sp;
 406
 407   m_tried_unwind_arch_default_at_func_entry = true;
 408
 409   Address current_pc;
 410   ProcessSP process_sp(thread.CalculateProcess());
 411   if (process_sp) {
 412     ABI *abi = process_sp->GetABI().get();
 413     if (abi) {
 414       m_unwind_plan_arch_default_at_func_entry_sp.reset(
 415           new UnwindPlan(lldb::eRegisterKindGeneric));
 416       if (!abi->CreateFunctionEntryUnwindPlan(
 417               *m_unwind_plan_arch_default_at_func_entry_sp)) {
 418         m_unwind_plan_arch_default_at_func_entry_sp.reset();
 419       }
 420     }
 421   }
 422
 423   return m_unwind_plan_arch_default_at_func_entry_sp;
 424 }
 425
 426 Address &FuncUnwinders::GetFirstNonPrologueInsn(Target &target) {
 427   std::lock_guard<std::recursive_mutex> guard(m_mutex);
 428   if (m_first_non_prologue_insn.IsValid())
 429     return m_first_non_prologue_insn;
 430
 431   ExecutionContext exe_ctx(target.shared_from_this(), false);
 432   UnwindAssemblySP assembly_profiler_sp(GetUnwindAssemblyProfiler(target));
 433   if (assembly_profiler_sp)
 434     assembly_profiler_sp->FirstNonPrologueInsn(m_range, exe_ctx,
 435                                                m_first_non_prologue_insn);
 436   return m_first_non_prologue_insn;
 437 }
 438
 439 const Address &FuncUnwinders::GetFunctionStartAddress() const {
 440   return m_range.GetBaseAddress();
 441 }
 442
 443 lldb::UnwindAssemblySP
 444 FuncUnwinders::GetUnwindAssemblyProfiler(Target &target) {
 445   UnwindAssemblySP assembly_profiler_sp;
 446   ArchSpec arch;
 447   if (m_unwind_table.GetArchitecture(arch)) {
 448     arch.MergeFrom(target.GetArchitecture());
 449     assembly_profiler_sp = UnwindAssembly::FindPlugin(arch);
 450   }
 451   return assembly_profiler_sp;
 452 }
 453
 454 Address FuncUnwinders::GetLSDAAddress(Target &target) {
 455   Address lsda_addr;
 456
 457   UnwindPlanSP unwind_plan_sp = GetEHFrameUnwindPlan(target, -1);
 458   if (unwind_plan_sp.get() == nullptr) {
 459     unwind_plan_sp = GetCompactUnwindUnwindPlan(target, -1);
 460   }
 461   if (unwind_plan_sp.get() && unwind_plan_sp->GetLSDAAddress().IsValid()) {
 462     lsda_addr = unwind_plan_sp->GetLSDAAddress();
 463   }
 464   return lsda_addr;
 465 }
 466
 467 Address FuncUnwinders::GetPersonalityRoutinePtrAddress(Target &target) {
 468   Address personality_addr;
 469
 470   UnwindPlanSP unwind_plan_sp = GetEHFrameUnwindPlan(target, -1);
 471   if (unwind_plan_sp.get() == nullptr) {
 472     unwind_plan_sp = GetCompactUnwindUnwindPlan(target, -1);
 473   }
 474   if (unwind_plan_sp.get() &&
 475       unwind_plan_sp->GetPersonalityFunctionPtr().IsValid()) {
 476     personality_addr = unwind_plan_sp->GetPersonalityFunctionPtr();
 477   }
 478
 479   return personality_addr;
 480 }