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ABISysV_ppc64.cpp
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1 //===-- ABISysV_ppc64.cpp -------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "ABISysV_ppc64.h"
10 
11 #include "llvm/ADT/STLExtras.h"
12 #include "llvm/ADT/Triple.h"
13 
17 #include "lldb/Core/Module.h"
19 #include "lldb/Core/Value.h"
23 #include "lldb/Symbol/UnwindPlan.h"
24 #include "lldb/Target/Process.h"
26 #include "lldb/Target/StackFrame.h"
27 #include "lldb/Target/Target.h"
28 #include "lldb/Target/Thread.h"
31 #include "lldb/Utility/Log.h"
33 #include "lldb/Utility/Status.h"
34 
35 #include "clang/AST/ASTContext.h"
36 #include "clang/AST/Attr.h"
37 #include "clang/AST/Decl.h"
38 
39 #define DECLARE_REGISTER_INFOS_PPC64_STRUCT
41 #undef DECLARE_REGISTER_INFOS_PPC64_STRUCT
42 
43 #define DECLARE_REGISTER_INFOS_PPC64LE_STRUCT
45 #undef DECLARE_REGISTER_INFOS_PPC64LE_STRUCT
46 
47 using namespace lldb;
48 using namespace lldb_private;
49 
51 
52 const lldb_private::RegisterInfo *
54  if (GetByteOrder() == lldb::eByteOrderLittle) {
55  count = llvm::array_lengthof(g_register_infos_ppc64le);
56  return g_register_infos_ppc64le;
57  } else {
58  count = llvm::array_lengthof(g_register_infos_ppc64);
59  return g_register_infos_ppc64;
60  }
61 }
62 
63 size_t ABISysV_ppc64::GetRedZoneSize() const { return 224; }
64 
66  return GetProcessSP()->GetByteOrder();
67 }
68 
69 // Static Functions
70 
71 ABISP
72 ABISysV_ppc64::CreateInstance(lldb::ProcessSP process_sp,
73  const ArchSpec &arch) {
74  if (arch.GetTriple().isPPC64())
75  return ABISP(
76  new ABISysV_ppc64(std::move(process_sp), MakeMCRegisterInfo(arch)));
77  return ABISP();
78 }
79 
81  addr_t func_addr, addr_t return_addr,
82  llvm::ArrayRef<addr_t> args) const {
84 
85  if (log) {
86  StreamString s;
87  s.Printf("ABISysV_ppc64::PrepareTrivialCall (tid = 0x%" PRIx64
88  ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64
89  ", return_addr = 0x%" PRIx64,
90  thread.GetID(), (uint64_t)sp, (uint64_t)func_addr,
91  (uint64_t)return_addr);
92 
93  for (size_t i = 0; i < args.size(); ++i)
94  s.Printf(", arg%" PRIu64 " = 0x%" PRIx64, static_cast<uint64_t>(i + 1),
95  args[i]);
96  s.PutCString(")");
97  log->PutString(s.GetString());
98  }
99 
100  RegisterContext *reg_ctx = thread.GetRegisterContext().get();
101  if (!reg_ctx)
102  return false;
103 
104  const RegisterInfo *reg_info = nullptr;
105 
106  if (args.size() > 8) // TODO handle more than 8 arguments
107  return false;
108 
109  for (size_t i = 0; i < args.size(); ++i) {
110  reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric,
112  LLDB_LOGF(log, "About to write arg%" PRIu64 " (0x%" PRIx64 ") into %s",
113  static_cast<uint64_t>(i + 1), args[i], reg_info->name);
114  if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i]))
115  return false;
116  }
117 
118  // First, align the SP
119 
120  LLDB_LOGF(log, "16-byte aligning SP: 0x%" PRIx64 " to 0x%" PRIx64,
121  (uint64_t)sp, (uint64_t)(sp & ~0xfull));
122 
123  sp &= ~(0xfull); // 16-byte alignment
124 
125  sp -= 544; // allocate frame to save TOC, RA and SP.
126 
127  Status error;
128  uint64_t reg_value;
129  const RegisterInfo *pc_reg_info =
131  const RegisterInfo *sp_reg_info =
133  ProcessSP process_sp(thread.GetProcess());
134  const RegisterInfo *lr_reg_info =
136  const RegisterInfo *r2_reg_info = reg_ctx->GetRegisterInfoAtIndex(2);
137  const RegisterInfo *r12_reg_info = reg_ctx->GetRegisterInfoAtIndex(12);
138 
139  // Save return address onto the stack.
140  LLDB_LOGF(log,
141  "Pushing the return address onto the stack: 0x%" PRIx64
142  "(+16): 0x%" PRIx64,
143  (uint64_t)sp, (uint64_t)return_addr);
144  if (!process_sp->WritePointerToMemory(sp + 16, return_addr, error))
145  return false;
146 
147  // Write the return address to link register.
148  LLDB_LOGF(log, "Writing LR: 0x%" PRIx64, (uint64_t)return_addr);
149  if (!reg_ctx->WriteRegisterFromUnsigned(lr_reg_info, return_addr))
150  return false;
151 
152  // Write target address to %r12 register.
153  LLDB_LOGF(log, "Writing R12: 0x%" PRIx64, (uint64_t)func_addr);
154  if (!reg_ctx->WriteRegisterFromUnsigned(r12_reg_info, func_addr))
155  return false;
156 
157  // Read TOC pointer value.
158  reg_value = reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0);
159 
160  // Write TOC pointer onto the stack.
161  uint64_t stack_offset;
162  if (GetByteOrder() == lldb::eByteOrderLittle)
163  stack_offset = 24;
164  else
165  stack_offset = 40;
166 
167  LLDB_LOGF(log, "Writing R2 (TOC) at SP(0x%" PRIx64 ")+%d: 0x%" PRIx64,
168  (uint64_t)(sp + stack_offset), (int)stack_offset,
169  (uint64_t)reg_value);
170  if (!process_sp->WritePointerToMemory(sp + stack_offset, reg_value, error))
171  return false;
172 
173  // Read the current SP value.
174  reg_value = reg_ctx->ReadRegisterAsUnsigned(sp_reg_info, 0);
175 
176  // Save current SP onto the stack.
177  LLDB_LOGF(log, "Writing SP at SP(0x%" PRIx64 ")+0: 0x%" PRIx64, (uint64_t)sp,
178  (uint64_t)reg_value);
179  if (!process_sp->WritePointerToMemory(sp, reg_value, error))
180  return false;
181 
182  // %r1 is set to the actual stack value.
183  LLDB_LOGF(log, "Writing SP: 0x%" PRIx64, (uint64_t)sp);
184 
185  if (!reg_ctx->WriteRegisterFromUnsigned(sp_reg_info, sp))
186  return false;
187 
188  // %pc is set to the address of the called function.
189 
190  LLDB_LOGF(log, "Writing IP: 0x%" PRIx64, (uint64_t)func_addr);
191 
192  if (!reg_ctx->WriteRegisterFromUnsigned(pc_reg_info, func_addr))
193  return false;
194 
195  return true;
196 }
197 
198 static bool ReadIntegerArgument(Scalar &scalar, unsigned int bit_width,
199  bool is_signed, Thread &thread,
200  uint32_t *argument_register_ids,
201  unsigned int &current_argument_register,
202  addr_t &current_stack_argument) {
203  if (bit_width > 64)
204  return false; // Scalar can't hold large integer arguments
205 
206  if (current_argument_register < 6) {
207  scalar = thread.GetRegisterContext()->ReadRegisterAsUnsigned(
208  argument_register_ids[current_argument_register], 0);
209  current_argument_register++;
210  if (is_signed)
211  scalar.SignExtend(bit_width);
212  } else {
213  uint32_t byte_size = (bit_width + (8 - 1)) / 8;
214  Status error;
215  if (thread.GetProcess()->ReadScalarIntegerFromMemory(
216  current_stack_argument, byte_size, is_signed, scalar, error)) {
217  current_stack_argument += byte_size;
218  return true;
219  }
220  return false;
221  }
222  return true;
223 }
224 
225 bool ABISysV_ppc64::GetArgumentValues(Thread &thread, ValueList &values) const {
226  unsigned int num_values = values.GetSize();
227  unsigned int value_index;
228 
229  // Extract the register context so we can read arguments from registers
230 
231  RegisterContext *reg_ctx = thread.GetRegisterContext().get();
232 
233  if (!reg_ctx)
234  return false;
235 
236  // Get the pointer to the first stack argument so we have a place to start
237  // when reading data
238 
239  addr_t sp = reg_ctx->GetSP(0);
240 
241  if (!sp)
242  return false;
243 
244  uint64_t stack_offset;
245  if (GetByteOrder() == lldb::eByteOrderLittle)
246  stack_offset = 32;
247  else
248  stack_offset = 48;
249 
250  // jump over return address.
251  addr_t current_stack_argument = sp + stack_offset;
252  uint32_t argument_register_ids[8];
253 
254  for (size_t i = 0; i < 8; ++i) {
255  argument_register_ids[i] =
256  reg_ctx
259  ->kinds[eRegisterKindLLDB];
260  }
261 
262  unsigned int current_argument_register = 0;
263 
264  for (value_index = 0; value_index < num_values; ++value_index) {
265  Value *value = values.GetValueAtIndex(value_index);
266 
267  if (!value)
268  return false;
269 
270  // We currently only support extracting values with Clang QualTypes. Do we
271  // care about others?
272  CompilerType compiler_type = value->GetCompilerType();
273  llvm::Optional<uint64_t> bit_size = compiler_type.GetBitSize(&thread);
274  if (!bit_size)
275  return false;
276  bool is_signed;
277 
278  if (compiler_type.IsIntegerOrEnumerationType(is_signed)) {
279  ReadIntegerArgument(value->GetScalar(), *bit_size, is_signed, thread,
280  argument_register_ids, current_argument_register,
281  current_stack_argument);
282  } else if (compiler_type.IsPointerType()) {
283  ReadIntegerArgument(value->GetScalar(), *bit_size, false, thread,
284  argument_register_ids, current_argument_register,
285  current_stack_argument);
286  }
287  }
288 
289  return true;
290 }
291 
292 Status ABISysV_ppc64::SetReturnValueObject(lldb::StackFrameSP &frame_sp,
293  lldb::ValueObjectSP &new_value_sp) {
294  Status error;
295  if (!new_value_sp) {
296  error.SetErrorString("Empty value object for return value.");
297  return error;
298  }
299 
300  CompilerType compiler_type = new_value_sp->GetCompilerType();
301  if (!compiler_type) {
302  error.SetErrorString("Null clang type for return value.");
303  return error;
304  }
305 
306  Thread *thread = frame_sp->GetThread().get();
307 
308  bool is_signed;
309  uint32_t count;
310  bool is_complex;
311 
312  RegisterContext *reg_ctx = thread->GetRegisterContext().get();
313 
314  bool set_it_simple = false;
315  if (compiler_type.IsIntegerOrEnumerationType(is_signed) ||
316  compiler_type.IsPointerType()) {
317  const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName("r3", 0);
318 
319  DataExtractor data;
320  Status data_error;
321  size_t num_bytes = new_value_sp->GetData(data, data_error);
322  if (data_error.Fail()) {
323  error.SetErrorStringWithFormat(
324  "Couldn't convert return value to raw data: %s",
325  data_error.AsCString());
326  return error;
327  }
328  lldb::offset_t offset = 0;
329  if (num_bytes <= 8) {
330  uint64_t raw_value = data.GetMaxU64(&offset, num_bytes);
331 
332  if (reg_ctx->WriteRegisterFromUnsigned(reg_info, raw_value))
333  set_it_simple = true;
334  } else {
335  error.SetErrorString("We don't support returning longer than 64 bit "
336  "integer values at present.");
337  }
338  } else if (compiler_type.IsFloatingPointType(count, is_complex)) {
339  if (is_complex)
340  error.SetErrorString(
341  "We don't support returning complex values at present");
342  else {
343  llvm::Optional<uint64_t> bit_width =
344  compiler_type.GetBitSize(frame_sp.get());
345  if (!bit_width) {
346  error.SetErrorString("can't get size of type");
347  return error;
348  }
349  if (*bit_width <= 64) {
350  DataExtractor data;
351  Status data_error;
352  size_t num_bytes = new_value_sp->GetData(data, data_error);
353  if (data_error.Fail()) {
354  error.SetErrorStringWithFormat(
355  "Couldn't convert return value to raw data: %s",
356  data_error.AsCString());
357  return error;
358  }
359 
360  unsigned char buffer[16];
361  ByteOrder byte_order = data.GetByteOrder();
362 
363  data.CopyByteOrderedData(0, num_bytes, buffer, 16, byte_order);
364  set_it_simple = true;
365  } else {
366  // FIXME - don't know how to do 80 bit long doubles yet.
367  error.SetErrorString(
368  "We don't support returning float values > 64 bits at present");
369  }
370  }
371  }
372 
373  if (!set_it_simple) {
374  // Okay we've got a structure or something that doesn't fit in a simple
375  // register. We should figure out where it really goes, but we don't
376  // support this yet.
377  error.SetErrorString("We only support setting simple integer and float "
378  "return types at present.");
379  }
380 
381  return error;
382 }
383 
384 //
385 // ReturnValueExtractor
386 //
387 
388 namespace {
389 
390 #define LOG_PREFIX "ReturnValueExtractor: "
391 
392 class ReturnValueExtractor {
393  // This class represents a register, from which data may be extracted.
394  //
395  // It may be constructed by directly specifying its index (where 0 is the
396  // first register used to return values) or by specifying the offset of a
397  // given struct field, in which case the appropriated register index will be
398  // calculated.
399  class Register {
400  public:
401  enum Type {
402  GPR, // General Purpose Register
403  FPR // Floating Point Register
404  };
405 
406  // main constructor
407  //
408  // offs - field offset in struct
409  Register(Type ty, uint32_t index, uint32_t offs, RegisterContext *reg_ctx,
410  ByteOrder byte_order)
411  : m_index(index), m_offs(offs % sizeof(uint64_t)),
412  m_avail(sizeof(uint64_t) - m_offs), m_type(ty), m_reg_ctx(reg_ctx),
413  m_byte_order(byte_order) {}
414 
415  // explicit index, no offset
416  Register(Type ty, uint32_t index, RegisterContext *reg_ctx,
417  ByteOrder byte_order)
418  : Register(ty, index, 0, reg_ctx, byte_order) {}
419 
420  // GPR, calculate index from offs
421  Register(uint32_t offs, RegisterContext *reg_ctx, ByteOrder byte_order)
422  : Register(GPR, offs / sizeof(uint64_t), offs, reg_ctx, byte_order) {}
423 
424  uint32_t Index() const { return m_index; }
425 
426  // register offset where data is located
427  uint32_t Offs() const { return m_offs; }
428 
429  // available bytes in this register
430  uint32_t Avail() const { return m_avail; }
431 
432  bool IsValid() const {
433  if (m_index > 7) {
434  LLDB_LOG(m_log, LOG_PREFIX
435  "No more than 8 registers should be used to return values");
436  return false;
437  }
438  return true;
439  }
440 
441  std::string GetName() const {
442  if (m_type == GPR)
443  return ("r" + llvm::Twine(m_index + 3)).str();
444  else
445  return ("f" + llvm::Twine(m_index + 1)).str();
446  }
447 
448  // get raw register data
449  bool GetRawData(uint64_t &raw_data) {
450  const RegisterInfo *reg_info =
451  m_reg_ctx->GetRegisterInfoByName(GetName());
452  if (!reg_info) {
453  LLDB_LOG(m_log, LOG_PREFIX "Failed to get RegisterInfo");
454  return false;
455  }
456 
457  RegisterValue reg_val;
458  if (!m_reg_ctx->ReadRegister(reg_info, reg_val)) {
459  LLDB_LOG(m_log, LOG_PREFIX "ReadRegister() failed");
460  return false;
461  }
462 
463  Status error;
464  uint32_t rc = reg_val.GetAsMemoryData(
465  reg_info, &raw_data, sizeof(raw_data), m_byte_order, error);
466  if (rc != sizeof(raw_data)) {
467  LLDB_LOG(m_log, LOG_PREFIX "GetAsMemoryData() failed");
468  return false;
469  }
470 
471  return true;
472  }
473 
474  private:
475  uint32_t m_index;
476  uint32_t m_offs;
477  uint32_t m_avail;
478  Type m_type;
479  RegisterContext *m_reg_ctx;
480  ByteOrder m_byte_order;
481  Log *m_log =
483  };
484 
485  Register GetGPR(uint32_t index) const {
486  return Register(Register::GPR, index, m_reg_ctx, m_byte_order);
487  }
488 
489  Register GetFPR(uint32_t index) const {
490  return Register(Register::FPR, index, m_reg_ctx, m_byte_order);
491  }
492 
493  Register GetGPRByOffs(uint32_t offs) const {
494  return Register(offs, m_reg_ctx, m_byte_order);
495  }
496 
497 public:
498  // factory
499  static llvm::Expected<ReturnValueExtractor> Create(Thread &thread,
500  CompilerType &type) {
501  RegisterContext *reg_ctx = thread.GetRegisterContext().get();
502  if (!reg_ctx)
503  return llvm::make_error<llvm::StringError>(
504  LOG_PREFIX "Failed to get RegisterContext",
505  llvm::inconvertibleErrorCode());
506 
507  ProcessSP process_sp = thread.GetProcess();
508  if (!process_sp)
509  return llvm::make_error<llvm::StringError>(
510  LOG_PREFIX "GetProcess() failed", llvm::inconvertibleErrorCode());
511 
512  return ReturnValueExtractor(thread, type, reg_ctx, process_sp);
513  }
514 
515  // main method: get value of the type specified at construction time
516  ValueObjectSP GetValue() {
517  const uint32_t type_flags = m_type.GetTypeInfo();
518 
519  // call the appropriate type handler
520  ValueSP value_sp;
521  ValueObjectSP valobj_sp;
522  if (type_flags & eTypeIsScalar) {
523  if (type_flags & eTypeIsInteger) {
524  value_sp = GetIntegerValue(0);
525  } else if (type_flags & eTypeIsFloat) {
526  if (type_flags & eTypeIsComplex) {
527  LLDB_LOG(m_log, LOG_PREFIX "Complex numbers are not supported yet");
528  return ValueObjectSP();
529  } else {
530  value_sp = GetFloatValue(m_type, 0);
531  }
532  }
533  } else if (type_flags & eTypeIsPointer) {
534  value_sp = GetPointerValue(0);
535  }
536 
537  if (value_sp) {
538  valobj_sp = ValueObjectConstResult::Create(
539  m_thread.GetStackFrameAtIndex(0).get(), *value_sp, ConstString(""));
540  } else if (type_flags & eTypeIsVector) {
541  valobj_sp = GetVectorValueObject();
542  } else if (type_flags & eTypeIsStructUnion || type_flags & eTypeIsClass) {
543  valobj_sp = GetStructValueObject();
544  }
545 
546  return valobj_sp;
547  }
548 
549 private:
550  // data
551  Thread &m_thread;
552  CompilerType &m_type;
553  uint64_t m_byte_size;
554  std::unique_ptr<DataBufferHeap> m_data_up;
555  int32_t m_src_offs = 0;
556  int32_t m_dst_offs = 0;
557  bool m_packed = false;
559  RegisterContext *m_reg_ctx;
560  ProcessSP m_process_sp;
561  ByteOrder m_byte_order;
562  uint32_t m_addr_size;
563 
564  // methods
565 
566  // constructor
567  ReturnValueExtractor(Thread &thread, CompilerType &type,
568  RegisterContext *reg_ctx, ProcessSP process_sp)
569  : m_thread(thread), m_type(type),
570  m_byte_size(m_type.GetByteSize(&thread).getValueOr(0)),
571  m_data_up(new DataBufferHeap(m_byte_size, 0)), m_reg_ctx(reg_ctx),
572  m_process_sp(process_sp), m_byte_order(process_sp->GetByteOrder()),
573  m_addr_size(
574  process_sp->GetTarget().GetArchitecture().GetAddressByteSize()) {}
575 
576  // build a new scalar value
577  ValueSP NewScalarValue(CompilerType &type) {
578  ValueSP value_sp(new Value);
579  value_sp->SetCompilerType(type);
580  value_sp->SetValueType(Value::ValueType::Scalar);
581  return value_sp;
582  }
583 
584  // get an integer value in the specified register
585  ValueSP GetIntegerValue(uint32_t reg_index) {
586  uint64_t raw_value;
587  auto reg = GetGPR(reg_index);
588  if (!reg.GetRawData(raw_value))
589  return ValueSP();
590 
591  // build value from data
592  ValueSP value_sp(NewScalarValue(m_type));
593 
594  uint32_t type_flags = m_type.GetTypeInfo();
595  bool is_signed = (type_flags & eTypeIsSigned) != 0;
596 
597  switch (m_byte_size) {
598  case sizeof(uint64_t):
599  if (is_signed)
600  value_sp->GetScalar() = (int64_t)(raw_value);
601  else
602  value_sp->GetScalar() = (uint64_t)(raw_value);
603  break;
604 
605  case sizeof(uint32_t):
606  if (is_signed)
607  value_sp->GetScalar() = (int32_t)(raw_value & UINT32_MAX);
608  else
609  value_sp->GetScalar() = (uint32_t)(raw_value & UINT32_MAX);
610  break;
611 
612  case sizeof(uint16_t):
613  if (is_signed)
614  value_sp->GetScalar() = (int16_t)(raw_value & UINT16_MAX);
615  else
616  value_sp->GetScalar() = (uint16_t)(raw_value & UINT16_MAX);
617  break;
618 
619  case sizeof(uint8_t):
620  if (is_signed)
621  value_sp->GetScalar() = (int8_t)(raw_value & UINT8_MAX);
622  else
623  value_sp->GetScalar() = (uint8_t)(raw_value & UINT8_MAX);
624  break;
625 
626  default:
627  llvm_unreachable("Invalid integer size");
628  }
629 
630  return value_sp;
631  }
632 
633  // get a floating point value on the specified register
634  ValueSP GetFloatValue(CompilerType &type, uint32_t reg_index) {
635  uint64_t raw_data;
636  auto reg = GetFPR(reg_index);
637  if (!reg.GetRawData(raw_data))
638  return {};
639 
640  // build value from data
641  ValueSP value_sp(NewScalarValue(type));
642 
643  DataExtractor de(&raw_data, sizeof(raw_data), m_byte_order, m_addr_size);
644 
645  offset_t offset = 0;
646  llvm::Optional<uint64_t> byte_size = type.GetByteSize(m_process_sp.get());
647  if (!byte_size)
648  return {};
649  switch (*byte_size) {
650  case sizeof(float):
651  value_sp->GetScalar() = (float)de.GetDouble(&offset);
652  break;
653 
654  case sizeof(double):
655  value_sp->GetScalar() = de.GetDouble(&offset);
656  break;
657 
658  default:
659  llvm_unreachable("Invalid floating point size");
660  }
661 
662  return value_sp;
663  }
664 
665  // get pointer value from register
666  ValueSP GetPointerValue(uint32_t reg_index) {
667  uint64_t raw_data;
668  auto reg = GetGPR(reg_index);
669  if (!reg.GetRawData(raw_data))
670  return ValueSP();
671 
672  // build value from raw data
673  ValueSP value_sp(NewScalarValue(m_type));
674  value_sp->GetScalar() = raw_data;
675  return value_sp;
676  }
677 
678  // build the ValueObject from our data buffer
679  ValueObjectSP BuildValueObject() {
680  DataExtractor de(DataBufferSP(m_data_up.release()), m_byte_order,
681  m_addr_size);
682  return ValueObjectConstResult::Create(&m_thread, m_type, ConstString(""),
683  de);
684  }
685 
686  // get a vector return value
687  ValueObjectSP GetVectorValueObject() {
688  const uint32_t MAX_VRS = 2;
689 
690  // get first V register used to return values
691  const RegisterInfo *vr[MAX_VRS];
692  vr[0] = m_reg_ctx->GetRegisterInfoByName("vr2");
693  if (!vr[0]) {
694  LLDB_LOG(m_log, LOG_PREFIX "Failed to get vr2 RegisterInfo");
695  return ValueObjectSP();
696  }
697 
698  const uint32_t vr_size = vr[0]->byte_size;
699  size_t vrs = 1;
700  if (m_byte_size > 2 * vr_size) {
701  LLDB_LOG(
702  m_log, LOG_PREFIX
703  "Returning vectors that don't fit in 2 VR regs is not supported");
704  return ValueObjectSP();
705  }
706 
707  // load vr3, if needed
708  if (m_byte_size > vr_size) {
709  vrs++;
710  vr[1] = m_reg_ctx->GetRegisterInfoByName("vr3");
711  if (!vr[1]) {
712  LLDB_LOG(m_log, LOG_PREFIX "Failed to get vr3 RegisterInfo");
713  return ValueObjectSP();
714  }
715  }
716 
717  // Get the whole contents of vector registers and let the logic here
718  // arrange the data properly.
719 
720  RegisterValue vr_val[MAX_VRS];
721  Status error;
722  std::unique_ptr<DataBufferHeap> vr_data(
723  new DataBufferHeap(vrs * vr_size, 0));
724 
725  for (uint32_t i = 0; i < vrs; i++) {
726  if (!m_reg_ctx->ReadRegister(vr[i], vr_val[i])) {
727  LLDB_LOG(m_log, LOG_PREFIX "Failed to read vector register contents");
728  return ValueObjectSP();
729  }
730  if (!vr_val[i].GetAsMemoryData(vr[i], vr_data->GetBytes() + i * vr_size,
731  vr_size, m_byte_order, error)) {
732  LLDB_LOG(m_log, LOG_PREFIX "Failed to extract vector register bytes");
733  return ValueObjectSP();
734  }
735  }
736 
737  // The compiler generated code seems to always put the vector elements at
738  // the end of the vector register, in case they don't occupy all of it.
739  // This offset variable handles this.
740  uint32_t offs = 0;
741  if (m_byte_size < vr_size)
742  offs = vr_size - m_byte_size;
743 
744  // copy extracted data to our buffer
745  memcpy(m_data_up->GetBytes(), vr_data->GetBytes() + offs, m_byte_size);
746  return BuildValueObject();
747  }
748 
749  // get a struct return value
750  ValueObjectSP GetStructValueObject() {
751  // case 1: get from stack
752  if (m_byte_size > 2 * sizeof(uint64_t)) {
753  uint64_t addr;
754  auto reg = GetGPR(0);
755  if (!reg.GetRawData(addr))
756  return {};
757 
758  Status error;
759  size_t rc = m_process_sp->ReadMemory(addr, m_data_up->GetBytes(),
760  m_byte_size, error);
761  if (rc != m_byte_size) {
762  LLDB_LOG(m_log, LOG_PREFIX "Failed to read memory pointed by r3");
763  return ValueObjectSP();
764  }
765  return BuildValueObject();
766  }
767 
768  // get number of children
769  const bool omit_empty_base_classes = true;
770  uint32_t n = m_type.GetNumChildren(omit_empty_base_classes, nullptr);
771  if (!n) {
772  LLDB_LOG(m_log, LOG_PREFIX "No children found in struct");
773  return {};
774  }
775 
776  // case 2: homogeneous double or float aggregate
777  CompilerType elem_type;
778  if (m_type.IsHomogeneousAggregate(&elem_type)) {
779  uint32_t type_flags = elem_type.GetTypeInfo();
780  llvm::Optional<uint64_t> elem_size =
781  elem_type.GetByteSize(m_process_sp.get());
782  if (!elem_size)
783  return {};
784  if (type_flags & eTypeIsComplex || !(type_flags & eTypeIsFloat)) {
785  LLDB_LOG(m_log,
786  LOG_PREFIX "Unexpected type found in homogeneous aggregate");
787  return {};
788  }
789 
790  for (uint32_t i = 0; i < n; i++) {
791  ValueSP val_sp = GetFloatValue(elem_type, i);
792  if (!val_sp)
793  return {};
794 
795  // copy to buffer
796  Status error;
797  size_t rc = val_sp->GetScalar().GetAsMemoryData(
798  m_data_up->GetBytes() + m_dst_offs, *elem_size, m_byte_order,
799  error);
800  if (rc != *elem_size) {
801  LLDB_LOG(m_log, LOG_PREFIX "Failed to get float data");
802  return {};
803  }
804  m_dst_offs += *elem_size;
805  }
806  return BuildValueObject();
807  }
808 
809  // case 3: get from GPRs
810 
811  // first, check if this is a packed struct or not
812  TypeSystemClang *ast =
813  llvm::dyn_cast<TypeSystemClang>(m_type.GetTypeSystem());
814  if (ast) {
815  clang::RecordDecl *record_decl = TypeSystemClang::GetAsRecordDecl(m_type);
816 
817  if (record_decl) {
818  auto attrs = record_decl->attrs();
819  for (const auto &attr : attrs) {
820  if (attr->getKind() == clang::attr::Packed) {
821  m_packed = true;
822  break;
823  }
824  }
825  }
826  }
827 
828  LLDB_LOG(m_log, LOG_PREFIX "{0} struct",
829  m_packed ? "packed" : "not packed");
830 
831  for (uint32_t i = 0; i < n; i++) {
832  std::string name;
833  uint32_t size;
834  GetChildType(i, name, size);
835  // NOTE: the offset returned by GetChildCompilerTypeAtIndex()
836  // can't be used because it never considers alignment bytes
837  // between struct fields.
838  LLDB_LOG(m_log, LOG_PREFIX "field={0}, size={1}", name, size);
839  if (!ExtractField(size))
840  return ValueObjectSP();
841  }
842 
843  return BuildValueObject();
844  }
845 
846  // extract 'size' bytes at 'offs' from GPRs
847  bool ExtractFromRegs(int32_t offs, uint32_t size, void *buf) {
848  while (size) {
849  auto reg = GetGPRByOffs(offs);
850  if (!reg.IsValid())
851  return false;
852 
853  uint32_t n = std::min(reg.Avail(), size);
854  uint64_t raw_data;
855 
856  if (!reg.GetRawData(raw_data))
857  return false;
858 
859  memcpy(buf, (char *)&raw_data + reg.Offs(), n);
860  offs += n;
861  size -= n;
862  buf = (char *)buf + n;
863  }
864  return true;
865  }
866 
867  // extract one field from GPRs and put it in our buffer
868  bool ExtractField(uint32_t size) {
869  auto reg = GetGPRByOffs(m_src_offs);
870  if (!reg.IsValid())
871  return false;
872 
873  // handle padding
874  if (!m_packed) {
875  uint32_t n = m_src_offs % size;
876 
877  // not 'size' bytes aligned
878  if (n) {
879  LLDB_LOG(m_log,
880  LOG_PREFIX "Extracting {0} alignment bytes at offset {1}", n,
881  m_src_offs);
882  // get alignment bytes
883  if (!ExtractFromRegs(m_src_offs, n, m_data_up->GetBytes() + m_dst_offs))
884  return false;
885  m_src_offs += n;
886  m_dst_offs += n;
887  }
888  }
889 
890  // get field
891  LLDB_LOG(m_log, LOG_PREFIX "Extracting {0} field bytes at offset {1}", size,
892  m_src_offs);
893  if (!ExtractFromRegs(m_src_offs, size, m_data_up->GetBytes() + m_dst_offs))
894  return false;
895  m_src_offs += size;
896  m_dst_offs += size;
897  return true;
898  }
899 
900  // get child
901  CompilerType GetChildType(uint32_t i, std::string &name, uint32_t &size) {
902  // GetChild constant inputs
903  const bool transparent_pointers = false;
904  const bool omit_empty_base_classes = true;
905  const bool ignore_array_bounds = false;
906  // GetChild output params
907  int32_t child_offs;
908  uint32_t child_bitfield_bit_size;
909  uint32_t child_bitfield_bit_offset;
910  bool child_is_base_class;
911  bool child_is_deref_of_parent;
912  ValueObject *valobj = nullptr;
913  uint64_t language_flags;
914  ExecutionContext exe_ctx;
915  m_thread.CalculateExecutionContext(exe_ctx);
916 
917  return m_type.GetChildCompilerTypeAtIndex(
918  &exe_ctx, i, transparent_pointers, omit_empty_base_classes,
919  ignore_array_bounds, name, size, child_offs, child_bitfield_bit_size,
920  child_bitfield_bit_offset, child_is_base_class,
921  child_is_deref_of_parent, valobj, language_flags);
922  }
923 };
924 
925 #undef LOG_PREFIX
926 
927 } // anonymous namespace
928 
929 ValueObjectSP
931  CompilerType &type) const {
932  if (!type)
933  return ValueObjectSP();
934 
935  auto exp_extractor = ReturnValueExtractor::Create(thread, type);
936  if (!exp_extractor) {
938  LLDB_LOG_ERROR(log, exp_extractor.takeError(),
939  "Extracting return value failed: {0}");
940  return ValueObjectSP();
941  }
942 
943  return exp_extractor.get().GetValue();
944 }
945 
947  Thread &thread, CompilerType &return_compiler_type) const {
948  return GetReturnValueObjectSimple(thread, return_compiler_type);
949 }
950 
952  unwind_plan.Clear();
953  unwind_plan.SetRegisterKind(eRegisterKindDWARF);
954 
955  uint32_t lr_reg_num;
956  uint32_t sp_reg_num;
957  uint32_t pc_reg_num;
958 
959  if (GetByteOrder() == lldb::eByteOrderLittle) {
960  lr_reg_num = ppc64le_dwarf::dwarf_lr_ppc64le;
961  sp_reg_num = ppc64le_dwarf::dwarf_r1_ppc64le;
962  pc_reg_num = ppc64le_dwarf::dwarf_pc_ppc64le;
963  } else {
964  lr_reg_num = ppc64_dwarf::dwarf_lr_ppc64;
965  sp_reg_num = ppc64_dwarf::dwarf_r1_ppc64;
966  pc_reg_num = ppc64_dwarf::dwarf_pc_ppc64;
967  }
968 
970 
971  // Our Call Frame Address is the stack pointer value
972  row->GetCFAValue().SetIsRegisterPlusOffset(sp_reg_num, 0);
973 
974  // The previous PC is in the LR
975  row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true);
976  unwind_plan.AppendRow(row);
977 
978  // All other registers are the same.
979 
980  unwind_plan.SetSourceName("ppc64 at-func-entry default");
981  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
982 
983  return true;
984 }
985 
987  unwind_plan.Clear();
988  unwind_plan.SetRegisterKind(eRegisterKindDWARF);
989 
990  uint32_t sp_reg_num;
991  uint32_t pc_reg_num;
992  uint32_t cr_reg_num;
993 
994  if (GetByteOrder() == lldb::eByteOrderLittle) {
995  sp_reg_num = ppc64le_dwarf::dwarf_r1_ppc64le;
996  pc_reg_num = ppc64le_dwarf::dwarf_lr_ppc64le;
997  cr_reg_num = ppc64le_dwarf::dwarf_cr_ppc64le;
998  } else {
999  sp_reg_num = ppc64_dwarf::dwarf_r1_ppc64;
1000  pc_reg_num = ppc64_dwarf::dwarf_lr_ppc64;
1001  cr_reg_num = ppc64_dwarf::dwarf_cr_ppc64;
1002  }
1003 
1005  const int32_t ptr_size = 8;
1006  row->SetUnspecifiedRegistersAreUndefined(true);
1007  row->GetCFAValue().SetIsRegisterDereferenced(sp_reg_num);
1008 
1009  row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 2, true);
1010  row->SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true);
1011  row->SetRegisterLocationToAtCFAPlusOffset(cr_reg_num, ptr_size, true);
1012 
1013  unwind_plan.AppendRow(row);
1014  unwind_plan.SetSourceName("ppc64 default unwind plan");
1015  unwind_plan.SetSourcedFromCompiler(eLazyBoolNo);
1018  unwind_plan.SetReturnAddressRegister(pc_reg_num);
1019  return true;
1020 }
1021 
1022 bool ABISysV_ppc64::RegisterIsVolatile(const RegisterInfo *reg_info) {
1023  return !RegisterIsCalleeSaved(reg_info);
1024 }
1025 
1026 // See "Register Usage" in the
1027 // "System V Application Binary Interface"
1028 // "64-bit PowerPC ELF Application Binary Interface Supplement" current version
1029 // is 2 released 2015 at
1030 // https://members.openpowerfoundation.org/document/dl/576
1031 bool ABISysV_ppc64::RegisterIsCalleeSaved(const RegisterInfo *reg_info) {
1032  if (reg_info) {
1033  // Preserved registers are :
1034  // r1,r2,r13-r31
1035  // cr2-cr4 (partially preserved)
1036  // f14-f31 (not yet)
1037  // v20-v31 (not yet)
1038  // vrsave (not yet)
1039 
1040  const char *name = reg_info->name;
1041  if (name[0] == 'r') {
1042  if ((name[1] == '1' || name[1] == '2') && name[2] == '\0')
1043  return true;
1044  if (name[1] == '1' && name[2] > '2')
1045  return true;
1046  if ((name[1] == '2' || name[1] == '3') && name[2] != '\0')
1047  return true;
1048  }
1049 
1050  if (name[0] == 'f' && name[1] >= '0' && name[2] <= '9') {
1051  if (name[2] == '\0')
1052  return false;
1053  if (name[1] == '1' && name[2] >= '4')
1054  return true;
1055  if ((name[1] == '2' || name[1] == '3') && name[2] != '\0')
1056  return true;
1057  }
1058 
1059  if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp
1060  return true;
1061  if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp
1062  return false;
1063  if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0') // pc
1064  return true;
1065  }
1066  return false;
1067 }
1068 
1070  PluginManager::RegisterPlugin(
1071  GetPluginNameStatic(), "System V ABI for ppc64 targets", CreateInstance);
1072 }
1073 
1075  PluginManager::UnregisterPlugin(CreateInstance);
1076 }
1077 
1079  static ConstString g_name("sysv-ppc64");
1080  return g_name;
1081 }
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Definition: ABISysV_ppc64.cpp:63
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Definition: ABISysV_ppc64.cpp:1022
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Definition: ABISysV_ppc64.cpp:951
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@ dwarf_r1_ppc64
Definition: PPC64_DWARF_Registers.h:18
Thread.h
UnwindPlan.h
lldb_private::RegisterContext::GetSP
uint64_t GetSP(uint64_t fail_value=LLDB_INVALID_ADDRESS)
Definition: RegisterContext.cpp:152
lldb_private::RegisterContext
Definition: RegisterContext.h:17
RegisterInfos_ppc64.h
ppc64_dwarf::dwarf_pc_ppc64
@ dwarf_pc_ppc64
Definition: PPC64_DWARF_Registers.h:89
lldb_private::UserID::GetID
lldb::user_id_t GetID() const
Get accessor for the user ID.
Definition: UserID.h:47
lldb_private::Thread::CalculateExecutionContext
void CalculateExecutionContext(ExecutionContext &exe_ctx) override
Reconstruct the object's execution context into sc.
Definition: Thread.cpp:1403
lldb_private::CompilerType::GetNumChildren
uint32_t GetNumChildren(bool omit_empty_base_classes, const ExecutionContext *exe_ctx) const
Definition: CompilerType.cpp:515
ppc64_dwarf::dwarf_cr_ppc64
@ dwarf_cr_ppc64
Definition: PPC64_DWARF_Registers.h:81
ValueObjectConstResult.h
lldb_private::UnwindPlan::RowSP
std::shared_ptr< Row > RowSP
Definition: UnwindPlan.h:395
GPR
Definition: RegisterContextFreeBSD_i386.cpp:16
GPR
#define GPR(r16)
Definition: ABIX86.cpp:144
lldb_private::UnwindPlan::Clear
void Clear()
Definition: UnwindPlan.h:510
lldb_private::Status
Definition: Status.h:44
lldb_private::ValueObject
ValueObject:
Definition: ValueObject.h:105
lldb_private::RegisterContext::WriteRegisterFromUnsigned
bool WriteRegisterFromUnsigned(uint32_t reg, uint64_t uval)
Definition: RegisterContext.cpp:205
lldb_private::UnwindPlan::Row
Definition: UnwindPlan.h:55
uint32_t
lldb_private::eLazyBoolNo
@ eLazyBoolNo
Definition: lldb-private-enumerations.h:115
LLDB_REGNUM_GENERIC_SP
#define LLDB_REGNUM_GENERIC_SP
Definition: lldb-defines.h:64
lldb_private::DataExtractor::GetMaxU64
uint64_t GetMaxU64(lldb::offset_t *offset_ptr, size_t byte_size) const
Extract an unsigned integer of size byte_size from *offset_ptr.
Definition: DataExtractor.cpp:526
lldb_private::CompilerType::IsPointerType
bool IsPointerType(CompilerType *pointee_type=nullptr) const
Definition: CompilerType.cpp:157
lldb_private::RegisterValue::GetAsMemoryData
uint32_t GetAsMemoryData(const RegisterInfo *reg_info, void *dst, uint32_t dst_len, lldb::ByteOrder dst_byte_order, Status &error) const
Definition: RegisterValue.cpp:38
lldb_private::CompilerType::GetTypeSystem
TypeSystem * GetTypeSystem() const
Accessors.
Definition: CompilerType.h:162
ABISysV_ppc64::Initialize
static void Initialize()
Definition: ABISysV_ppc64.cpp:1069
lldb_private::CompilerType::GetBitSize
llvm::Optional< uint64_t > GetBitSize(ExecutionContextScope *exe_scope) const
Return the size of the type in bits.
Definition: CompilerType.cpp:482
lldb_private::Type
Definition: Type.h:66
lldb_private::CompilerType::GetTypeInfo
uint32_t GetTypeInfo(CompilerType *pointee_or_element_compiler_type=nullptr) const
Definition: CompilerType.cpp:290
UINT32_MAX
#define UINT32_MAX
Definition: lldb-defines.h:31
uint16_t
ABISysV_ppc64::GetReturnValueObjectSimple
lldb::ValueObjectSP GetReturnValueObjectSimple(lldb_private::Thread &thread, lldb_private::CompilerType &ast_type) const
Definition: ABISysV_ppc64.cpp:930
PluginManager.h
ABISysV_ppc64::GetRegisterInfoArray
const lldb_private::RegisterInfo * GetRegisterInfoArray(uint32_t &count) override
Definition: ABISysV_ppc64.cpp:53
LLDB_LOG
#define LLDB_LOG(log,...)
The LLDB_LOG* macros defined below are the way to emit log messages.
Definition: Log.h:242
DataExtractor.h
lldb_private::CompilerType
Generic representation of a type in a programming language.
Definition: CompilerType.h:33
lldb_private::Stream::Printf
size_t Printf(const char *format,...) __attribute__((format(printf
Output printf formatted output to the stream.
Definition: Stream.cpp:107
lldb_private::Value::GetCompilerType
const CompilerType & GetCompilerType()
Definition: Value.cpp:225
Status.h
lldb_private
A class that represents a running process on the host machine.
Definition: SBCommandInterpreterRunOptions.h:16
ABISysV_ppc64::GetByteOrder
lldb::ByteOrder GetByteOrder() const
Definition: ABISysV_ppc64.cpp:65
LLDB_REGNUM_GENERIC_PC
#define LLDB_REGNUM_GENERIC_PC
Definition: lldb-defines.h:63
RegisterInfos_ppc64le.h
lldb_private::TypeSystemClang
A TypeSystem implementation based on Clang.
Definition: TypeSystemClang.h:106
ConstString.h
lldb_private::DataExtractor::CopyByteOrderedData
lldb::offset_t CopyByteOrderedData(lldb::offset_t src_offset, lldb::offset_t src_len, void *dst, lldb::offset_t dst_len, lldb::ByteOrder dst_byte_order) const
Copy dst_len bytes from *offset_ptr and ensure the copied data is treated as a value that can be swap...
Definition: DataExtractor.cpp:692
LLDB_PLUGIN_DEFINE
#define LLDB_PLUGIN_DEFINE(PluginName)
Definition: PluginManager.h:31
lldb_private::Log
Definition: Log.h:49
lldb_private::Stream::PutCString
size_t PutCString(llvm::StringRef cstr)
Output a C string to the stream.
Definition: Stream.cpp:63
lldb_private::Thread::GetRegisterContext
virtual lldb::RegisterContextSP GetRegisterContext()=0
lldb::eByteOrderLittle
@ eByteOrderLittle
Definition: lldb-enumerations.h:142
lldb_private::DataBufferHeap
Definition: DataBufferHeap.h:30
lldb_private::UnwindPlan
Definition: UnwindPlan.h:53
lldb
Definition: SBAddress.h:15
ppc64le_dwarf::dwarf_r1_ppc64le
@ dwarf_r1_ppc64le
Definition: PPC64LE_DWARF_Registers.h:18
RegisterContext.h
LLDB_LOG_ERROR
#define LLDB_LOG_ERROR(log, error,...)
Definition: Log.h:265
Value.h
ABISysV_ppc64::GetPluginNameStatic
static lldb_private::ConstString GetPluginNameStatic()
Definition: ABISysV_ppc64.cpp:1078
lldb_private::RegisterContext::GetRegisterInfoByName
const RegisterInfo * GetRegisterInfoByName(llvm::StringRef reg_name, uint32_t start_idx=0)
Definition: RegisterContext.cpp:52
lldb::ByteOrder
ByteOrder
Byte ordering definitions.
Definition: lldb-enumerations.h:138
lldb_private::Status::AsCString
const char * AsCString(const char *default_error_str="unknown error") const
Get the error string associated with the current error.
Definition: Status.cpp:131
LLDB_REGNUM_GENERIC_RA
#define LLDB_REGNUM_GENERIC_RA
Definition: lldb-defines.h:66