1 //===-- ABIMacOSX_arm64.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 "ABIMacOSX_arm64.h" 10 11 #include <vector> 12 13 #include "llvm/ADT/STLExtras.h" 14 #include "llvm/ADT/Triple.h" 15 16 #include "lldb/Core/Module.h" 17 #include "lldb/Core/PluginManager.h" 18 #include "lldb/Core/Value.h" 19 #include "lldb/Core/ValueObjectConstResult.h" 20 #include "lldb/Symbol/UnwindPlan.h" 21 #include "lldb/Target/Process.h" 22 #include "lldb/Target/RegisterContext.h" 23 #include "lldb/Target/Target.h" 24 #include "lldb/Target/Thread.h" 25 #include "lldb/Utility/ConstString.h" 26 #include "lldb/Utility/Log.h" 27 #include "lldb/Utility/RegisterValue.h" 28 #include "lldb/Utility/Scalar.h" 29 #include "lldb/Utility/Status.h" 30 31 #include "Utility/ARM64_DWARF_Registers.h" 32 33 using namespace lldb; 34 using namespace lldb_private; 35 36 static const char *pluginDesc = "Mac OS X ABI for arm64 targets"; 37 38 size_t ABIMacOSX_arm64::GetRedZoneSize() const { return 128; } 39 40 // Static Functions 41 42 ABISP 43 ABIMacOSX_arm64::CreateInstance(ProcessSP process_sp, const ArchSpec &arch) { 44 const llvm::Triple::ArchType arch_type = arch.GetTriple().getArch(); 45 const llvm::Triple::VendorType vendor_type = arch.GetTriple().getVendor(); 46 47 if (vendor_type == llvm::Triple::Apple) { 48 if (arch_type == llvm::Triple::aarch64 || 49 arch_type == llvm::Triple::aarch64_32) { 50 return ABISP( 51 new ABIMacOSX_arm64(std::move(process_sp), MakeMCRegisterInfo(arch))); 52 } 53 } 54 55 return ABISP(); 56 } 57 58 bool ABIMacOSX_arm64::PrepareTrivialCall( 59 Thread &thread, lldb::addr_t sp, lldb::addr_t func_addr, 60 lldb::addr_t return_addr, llvm::ArrayRef<lldb::addr_t> args) const { 61 RegisterContext *reg_ctx = thread.GetRegisterContext().get(); 62 if (!reg_ctx) 63 return false; 64 65 Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); 66 67 if (log) { 68 StreamString s; 69 s.Printf("ABISysV_x86_64::PrepareTrivialCall (tid = 0x%" PRIx64 70 ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64 71 ", return_addr = 0x%" PRIx64, 72 thread.GetID(), (uint64_t)sp, (uint64_t)func_addr, 73 (uint64_t)return_addr); 74 75 for (size_t i = 0; i < args.size(); ++i) 76 s.Printf(", arg%d = 0x%" PRIx64, static_cast<int>(i + 1), args[i]); 77 s.PutCString(")"); 78 log->PutString(s.GetString()); 79 } 80 81 const uint32_t pc_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 82 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC); 83 const uint32_t sp_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 84 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); 85 const uint32_t ra_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 86 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA); 87 88 // x0 - x7 contain first 8 simple args 89 if (args.size() > 8) // TODO handle more than 6 arguments 90 return false; 91 92 for (size_t i = 0; i < args.size(); ++i) { 93 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo( 94 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + i); 95 LLDB_LOGF(log, "About to write arg%d (0x%" PRIx64 ") into %s", 96 static_cast<int>(i + 1), args[i], reg_info->name); 97 if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i])) 98 return false; 99 } 100 101 // Set "lr" to the return address 102 if (!reg_ctx->WriteRegisterFromUnsigned( 103 reg_ctx->GetRegisterInfoAtIndex(ra_reg_num), return_addr)) 104 return false; 105 106 // Set "sp" to the requested value 107 if (!reg_ctx->WriteRegisterFromUnsigned( 108 reg_ctx->GetRegisterInfoAtIndex(sp_reg_num), sp)) 109 return false; 110 111 // Set "pc" to the address requested 112 if (!reg_ctx->WriteRegisterFromUnsigned( 113 reg_ctx->GetRegisterInfoAtIndex(pc_reg_num), func_addr)) 114 return false; 115 116 return true; 117 } 118 119 bool ABIMacOSX_arm64::GetArgumentValues(Thread &thread, 120 ValueList &values) const { 121 uint32_t num_values = values.GetSize(); 122 123 ExecutionContext exe_ctx(thread.shared_from_this()); 124 125 // Extract the register context so we can read arguments from registers 126 127 RegisterContext *reg_ctx = thread.GetRegisterContext().get(); 128 129 if (!reg_ctx) 130 return false; 131 132 addr_t sp = 0; 133 134 for (uint32_t value_idx = 0; value_idx < num_values; ++value_idx) { 135 // We currently only support extracting values with Clang QualTypes. Do we 136 // care about others? 137 Value *value = values.GetValueAtIndex(value_idx); 138 139 if (!value) 140 return false; 141 142 CompilerType value_type = value->GetCompilerType(); 143 llvm::Optional<uint64_t> bit_size = value_type.GetBitSize(&thread); 144 if (!bit_size) 145 return false; 146 147 bool is_signed = false; 148 size_t bit_width = 0; 149 if (value_type.IsIntegerOrEnumerationType(is_signed)) { 150 bit_width = *bit_size; 151 } else if (value_type.IsPointerOrReferenceType()) { 152 bit_width = *bit_size; 153 } else { 154 // We only handle integer, pointer and reference types currently... 155 return false; 156 } 157 158 if (bit_width <= (exe_ctx.GetProcessRef().GetAddressByteSize() * 8)) { 159 if (value_idx < 8) { 160 // Arguments 1-6 are in x0-x5... 161 const RegisterInfo *reg_info = nullptr; 162 // Search by generic ID first, then fall back to by name 163 uint32_t arg_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 164 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + value_idx); 165 if (arg_reg_num != LLDB_INVALID_REGNUM) { 166 reg_info = reg_ctx->GetRegisterInfoAtIndex(arg_reg_num); 167 } else { 168 switch (value_idx) { 169 case 0: 170 reg_info = reg_ctx->GetRegisterInfoByName("x0"); 171 break; 172 case 1: 173 reg_info = reg_ctx->GetRegisterInfoByName("x1"); 174 break; 175 case 2: 176 reg_info = reg_ctx->GetRegisterInfoByName("x2"); 177 break; 178 case 3: 179 reg_info = reg_ctx->GetRegisterInfoByName("x3"); 180 break; 181 case 4: 182 reg_info = reg_ctx->GetRegisterInfoByName("x4"); 183 break; 184 case 5: 185 reg_info = reg_ctx->GetRegisterInfoByName("x5"); 186 break; 187 case 6: 188 reg_info = reg_ctx->GetRegisterInfoByName("x6"); 189 break; 190 case 7: 191 reg_info = reg_ctx->GetRegisterInfoByName("x7"); 192 break; 193 } 194 } 195 196 if (reg_info) { 197 RegisterValue reg_value; 198 199 if (reg_ctx->ReadRegister(reg_info, reg_value)) { 200 if (is_signed) 201 reg_value.SignExtend(bit_width); 202 if (!reg_value.GetScalarValue(value->GetScalar())) 203 return false; 204 continue; 205 } 206 } 207 return false; 208 } else { 209 if (sp == 0) { 210 // Read the stack pointer if we already haven't read it 211 sp = reg_ctx->GetSP(0); 212 if (sp == 0) 213 return false; 214 } 215 216 // Arguments 5 on up are on the stack 217 const uint32_t arg_byte_size = (bit_width + (8 - 1)) / 8; 218 Status error; 219 if (!exe_ctx.GetProcessRef().ReadScalarIntegerFromMemory( 220 sp, arg_byte_size, is_signed, value->GetScalar(), error)) 221 return false; 222 223 sp += arg_byte_size; 224 // Align up to the next 8 byte boundary if needed 225 if (sp % 8) { 226 sp >>= 3; 227 sp += 1; 228 sp <<= 3; 229 } 230 } 231 } 232 } 233 return true; 234 } 235 236 Status 237 ABIMacOSX_arm64::SetReturnValueObject(lldb::StackFrameSP &frame_sp, 238 lldb::ValueObjectSP &new_value_sp) { 239 Status error; 240 if (!new_value_sp) { 241 error.SetErrorString("Empty value object for return value."); 242 return error; 243 } 244 245 CompilerType return_value_type = new_value_sp->GetCompilerType(); 246 if (!return_value_type) { 247 error.SetErrorString("Null clang type for return value."); 248 return error; 249 } 250 251 Thread *thread = frame_sp->GetThread().get(); 252 253 RegisterContext *reg_ctx = thread->GetRegisterContext().get(); 254 255 if (reg_ctx) { 256 DataExtractor data; 257 Status data_error; 258 const uint64_t byte_size = new_value_sp->GetData(data, data_error); 259 if (data_error.Fail()) { 260 error.SetErrorStringWithFormat( 261 "Couldn't convert return value to raw data: %s", 262 data_error.AsCString()); 263 return error; 264 } 265 266 const uint32_t type_flags = return_value_type.GetTypeInfo(nullptr); 267 if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) { 268 if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) { 269 // Extract the register context so we can read arguments from registers 270 lldb::offset_t offset = 0; 271 if (byte_size <= 16) { 272 const RegisterInfo *x0_info = reg_ctx->GetRegisterInfoByName("x0", 0); 273 if (byte_size <= 8) { 274 uint64_t raw_value = data.GetMaxU64(&offset, byte_size); 275 276 if (!reg_ctx->WriteRegisterFromUnsigned(x0_info, raw_value)) 277 error.SetErrorString("failed to write register x0"); 278 } else { 279 uint64_t raw_value = data.GetMaxU64(&offset, 8); 280 281 if (reg_ctx->WriteRegisterFromUnsigned(x0_info, raw_value)) { 282 const RegisterInfo *x1_info = 283 reg_ctx->GetRegisterInfoByName("x1", 0); 284 raw_value = data.GetMaxU64(&offset, byte_size - offset); 285 286 if (!reg_ctx->WriteRegisterFromUnsigned(x1_info, raw_value)) 287 error.SetErrorString("failed to write register x1"); 288 } 289 } 290 } else { 291 error.SetErrorString("We don't support returning longer than 128 bit " 292 "integer values at present."); 293 } 294 } else if (type_flags & eTypeIsFloat) { 295 if (type_flags & eTypeIsComplex) { 296 // Don't handle complex yet. 297 error.SetErrorString( 298 "returning complex float values are not supported"); 299 } else { 300 const RegisterInfo *v0_info = reg_ctx->GetRegisterInfoByName("v0", 0); 301 302 if (v0_info) { 303 if (byte_size <= 16) { 304 if (byte_size <= RegisterValue::GetMaxByteSize()) { 305 RegisterValue reg_value; 306 error = reg_value.SetValueFromData(v0_info, data, 0, true); 307 if (error.Success()) { 308 if (!reg_ctx->WriteRegister(v0_info, reg_value)) 309 error.SetErrorString("failed to write register v0"); 310 } 311 } else { 312 error.SetErrorStringWithFormat( 313 "returning float values with a byte size of %" PRIu64 314 " are not supported", 315 byte_size); 316 } 317 } else { 318 error.SetErrorString("returning float values longer than 128 " 319 "bits are not supported"); 320 } 321 } else { 322 error.SetErrorString("v0 register is not available on this target"); 323 } 324 } 325 } 326 } else if (type_flags & eTypeIsVector) { 327 if (byte_size > 0) { 328 const RegisterInfo *v0_info = reg_ctx->GetRegisterInfoByName("v0", 0); 329 330 if (v0_info) { 331 if (byte_size <= v0_info->byte_size) { 332 RegisterValue reg_value; 333 error = reg_value.SetValueFromData(v0_info, data, 0, true); 334 if (error.Success()) { 335 if (!reg_ctx->WriteRegister(v0_info, reg_value)) 336 error.SetErrorString("failed to write register v0"); 337 } 338 } 339 } 340 } 341 } 342 } else { 343 error.SetErrorString("no registers are available"); 344 } 345 346 return error; 347 } 348 349 bool ABIMacOSX_arm64::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) { 350 unwind_plan.Clear(); 351 unwind_plan.SetRegisterKind(eRegisterKindDWARF); 352 353 uint32_t lr_reg_num = arm64_dwarf::lr; 354 uint32_t sp_reg_num = arm64_dwarf::sp; 355 uint32_t pc_reg_num = arm64_dwarf::pc; 356 357 UnwindPlan::RowSP row(new UnwindPlan::Row); 358 359 // Our previous Call Frame Address is the stack pointer 360 row->GetCFAValue().SetIsRegisterPlusOffset(sp_reg_num, 0); 361 362 // Our previous PC is in the LR 363 row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true); 364 365 unwind_plan.AppendRow(row); 366 367 // All other registers are the same. 368 369 unwind_plan.SetSourceName("arm64 at-func-entry default"); 370 unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); 371 372 return true; 373 } 374 375 bool ABIMacOSX_arm64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) { 376 unwind_plan.Clear(); 377 unwind_plan.SetRegisterKind(eRegisterKindDWARF); 378 379 uint32_t fp_reg_num = arm64_dwarf::fp; 380 uint32_t pc_reg_num = arm64_dwarf::pc; 381 382 UnwindPlan::RowSP row(new UnwindPlan::Row); 383 const int32_t ptr_size = 8; 384 385 row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size); 386 row->SetOffset(0); 387 388 row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true); 389 row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true); 390 391 unwind_plan.AppendRow(row); 392 unwind_plan.SetSourceName("arm64-apple-darwin default unwind plan"); 393 unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); 394 unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo); 395 unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo); 396 return true; 397 } 398 399 // AAPCS64 (Procedure Call Standard for the ARM 64-bit Architecture) says 400 // registers x19 through x28 and sp are callee preserved. v8-v15 are non- 401 // volatile (and specifically only the lower 8 bytes of these regs), the rest 402 // of the fp/SIMD registers are volatile. 403 // 404 // v. https://github.com/ARM-software/abi-aa/blob/master/aapcs64/ 405 406 // We treat x29 as callee preserved also, else the unwinder won't try to 407 // retrieve fp saves. 408 409 bool ABIMacOSX_arm64::RegisterIsVolatile(const RegisterInfo *reg_info) { 410 if (reg_info) { 411 const char *name = reg_info->name; 412 413 // Sometimes we'll be called with the "alternate" name for these registers; 414 // recognize them as non-volatile. 415 416 if (name[0] == 'p' && name[1] == 'c') // pc 417 return false; 418 if (name[0] == 'f' && name[1] == 'p') // fp 419 return false; 420 if (name[0] == 's' && name[1] == 'p') // sp 421 return false; 422 if (name[0] == 'l' && name[1] == 'r') // lr 423 return false; 424 425 if (name[0] == 'x') { 426 // Volatile registers: x0-x18, x30 (lr) 427 // Return false for the non-volatile gpr regs, true for everything else 428 switch (name[1]) { 429 case '1': 430 switch (name[2]) { 431 case '9': 432 return false; // x19 is non-volatile 433 default: 434 return true; 435 } 436 break; 437 case '2': 438 switch (name[2]) { 439 case '0': 440 case '1': 441 case '2': 442 case '3': 443 case '4': 444 case '5': 445 case '6': 446 case '7': 447 case '8': 448 return false; // x20 - 28 are non-volatile 449 case '9': 450 return false; // x29 aka fp treat as non-volatile on Darwin 451 default: 452 return true; 453 } 454 case '3': // x30 aka lr treat as non-volatile 455 if (name[2] == '0') 456 return false; 457 break; 458 default: 459 return true; 460 } 461 } else if (name[0] == 'v' || name[0] == 's' || name[0] == 'd') { 462 // Volatile registers: v0-7, v16-v31 463 // Return false for non-volatile fp/SIMD regs, true for everything else 464 switch (name[1]) { 465 case '8': 466 case '9': 467 return false; // v8-v9 are non-volatile 468 case '1': 469 switch (name[2]) { 470 case '0': 471 case '1': 472 case '2': 473 case '3': 474 case '4': 475 case '5': 476 return false; // v10-v15 are non-volatile 477 default: 478 return true; 479 } 480 default: 481 return true; 482 } 483 } 484 } 485 return true; 486 } 487 488 static bool LoadValueFromConsecutiveGPRRegisters( 489 ExecutionContext &exe_ctx, RegisterContext *reg_ctx, 490 const CompilerType &value_type, 491 bool is_return_value, // false => parameter, true => return value 492 uint32_t &NGRN, // NGRN (see ABI documentation) 493 uint32_t &NSRN, // NSRN (see ABI documentation) 494 DataExtractor &data) { 495 llvm::Optional<uint64_t> byte_size = value_type.GetByteSize(nullptr); 496 if (!byte_size || *byte_size == 0) 497 return false; 498 499 std::unique_ptr<DataBufferHeap> heap_data_up( 500 new DataBufferHeap(*byte_size, 0)); 501 const ByteOrder byte_order = exe_ctx.GetProcessRef().GetByteOrder(); 502 Status error; 503 504 CompilerType base_type; 505 const uint32_t homogeneous_count = 506 value_type.IsHomogeneousAggregate(&base_type); 507 if (homogeneous_count > 0 && homogeneous_count <= 8) { 508 // Make sure we have enough registers 509 if (NSRN < 8 && (8 - NSRN) >= homogeneous_count) { 510 if (!base_type) 511 return false; 512 llvm::Optional<uint64_t> base_byte_size = base_type.GetByteSize(nullptr); 513 if (!base_byte_size) 514 return false; 515 uint32_t data_offset = 0; 516 517 for (uint32_t i = 0; i < homogeneous_count; ++i) { 518 char v_name[8]; 519 ::snprintf(v_name, sizeof(v_name), "v%u", NSRN); 520 const RegisterInfo *reg_info = 521 reg_ctx->GetRegisterInfoByName(v_name, 0); 522 if (reg_info == nullptr) 523 return false; 524 525 if (*base_byte_size > reg_info->byte_size) 526 return false; 527 528 RegisterValue reg_value; 529 530 if (!reg_ctx->ReadRegister(reg_info, reg_value)) 531 return false; 532 533 // Make sure we have enough room in "heap_data_up" 534 if ((data_offset + *base_byte_size) <= heap_data_up->GetByteSize()) { 535 const size_t bytes_copied = reg_value.GetAsMemoryData( 536 reg_info, heap_data_up->GetBytes() + data_offset, *base_byte_size, 537 byte_order, error); 538 if (bytes_copied != *base_byte_size) 539 return false; 540 data_offset += bytes_copied; 541 ++NSRN; 542 } else 543 return false; 544 } 545 data.SetByteOrder(byte_order); 546 data.SetAddressByteSize(exe_ctx.GetProcessRef().GetAddressByteSize()); 547 data.SetData(DataBufferSP(heap_data_up.release())); 548 return true; 549 } 550 } 551 552 const size_t max_reg_byte_size = 16; 553 if (*byte_size <= max_reg_byte_size) { 554 size_t bytes_left = *byte_size; 555 uint32_t data_offset = 0; 556 while (data_offset < *byte_size) { 557 if (NGRN >= 8) 558 return false; 559 560 uint32_t reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 561 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + NGRN); 562 if (reg_num == LLDB_INVALID_REGNUM) 563 return false; 564 565 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoAtIndex(reg_num); 566 if (reg_info == nullptr) 567 return false; 568 569 RegisterValue reg_value; 570 571 if (!reg_ctx->ReadRegister(reg_info, reg_value)) 572 return false; 573 574 const size_t curr_byte_size = std::min<size_t>(8, bytes_left); 575 const size_t bytes_copied = reg_value.GetAsMemoryData( 576 reg_info, heap_data_up->GetBytes() + data_offset, curr_byte_size, 577 byte_order, error); 578 if (bytes_copied == 0) 579 return false; 580 if (bytes_copied >= bytes_left) 581 break; 582 data_offset += bytes_copied; 583 bytes_left -= bytes_copied; 584 ++NGRN; 585 } 586 } else { 587 const RegisterInfo *reg_info = nullptr; 588 if (is_return_value) { 589 // We are assuming we are decoding this immediately after returning from 590 // a function call and that the address of the structure is in x8 591 reg_info = reg_ctx->GetRegisterInfoByName("x8", 0); 592 } else { 593 // We are assuming we are stopped at the first instruction in a function 594 // and that the ABI is being respected so all parameters appear where 595 // they should be (functions with no external linkage can legally violate 596 // the ABI). 597 if (NGRN >= 8) 598 return false; 599 600 uint32_t reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 601 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + NGRN); 602 if (reg_num == LLDB_INVALID_REGNUM) 603 return false; 604 reg_info = reg_ctx->GetRegisterInfoAtIndex(reg_num); 605 if (reg_info == nullptr) 606 return false; 607 ++NGRN; 608 } 609 610 if (reg_info == nullptr) 611 return false; 612 613 const lldb::addr_t value_addr = 614 reg_ctx->ReadRegisterAsUnsigned(reg_info, LLDB_INVALID_ADDRESS); 615 616 if (value_addr == LLDB_INVALID_ADDRESS) 617 return false; 618 619 if (exe_ctx.GetProcessRef().ReadMemory( 620 value_addr, heap_data_up->GetBytes(), heap_data_up->GetByteSize(), 621 error) != heap_data_up->GetByteSize()) { 622 return false; 623 } 624 } 625 626 data.SetByteOrder(byte_order); 627 data.SetAddressByteSize(exe_ctx.GetProcessRef().GetAddressByteSize()); 628 data.SetData(DataBufferSP(heap_data_up.release())); 629 return true; 630 } 631 632 ValueObjectSP ABIMacOSX_arm64::GetReturnValueObjectImpl( 633 Thread &thread, CompilerType &return_compiler_type) const { 634 ValueObjectSP return_valobj_sp; 635 Value value; 636 637 ExecutionContext exe_ctx(thread.shared_from_this()); 638 if (exe_ctx.GetTargetPtr() == nullptr || exe_ctx.GetProcessPtr() == nullptr) 639 return return_valobj_sp; 640 641 // value.SetContext (Value::eContextTypeClangType, return_compiler_type); 642 value.SetCompilerType(return_compiler_type); 643 644 RegisterContext *reg_ctx = thread.GetRegisterContext().get(); 645 if (!reg_ctx) 646 return return_valobj_sp; 647 648 llvm::Optional<uint64_t> byte_size = 649 return_compiler_type.GetByteSize(nullptr); 650 if (!byte_size) 651 return return_valobj_sp; 652 653 const uint32_t type_flags = return_compiler_type.GetTypeInfo(nullptr); 654 if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) { 655 value.SetValueType(Value::eValueTypeScalar); 656 657 bool success = false; 658 if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) { 659 // Extract the register context so we can read arguments from registers 660 if (*byte_size <= 8) { 661 const RegisterInfo *x0_reg_info = 662 reg_ctx->GetRegisterInfoByName("x0", 0); 663 if (x0_reg_info) { 664 uint64_t raw_value = 665 thread.GetRegisterContext()->ReadRegisterAsUnsigned(x0_reg_info, 666 0); 667 const bool is_signed = (type_flags & eTypeIsSigned) != 0; 668 switch (*byte_size) { 669 default: 670 break; 671 case 16: // uint128_t 672 // In register x0 and x1 673 { 674 const RegisterInfo *x1_reg_info = 675 reg_ctx->GetRegisterInfoByName("x1", 0); 676 677 if (x1_reg_info) { 678 if (*byte_size <= 679 x0_reg_info->byte_size + x1_reg_info->byte_size) { 680 std::unique_ptr<DataBufferHeap> heap_data_up( 681 new DataBufferHeap(*byte_size, 0)); 682 const ByteOrder byte_order = 683 exe_ctx.GetProcessRef().GetByteOrder(); 684 RegisterValue x0_reg_value; 685 RegisterValue x1_reg_value; 686 if (reg_ctx->ReadRegister(x0_reg_info, x0_reg_value) && 687 reg_ctx->ReadRegister(x1_reg_info, x1_reg_value)) { 688 Status error; 689 if (x0_reg_value.GetAsMemoryData( 690 x0_reg_info, heap_data_up->GetBytes() + 0, 8, 691 byte_order, error) && 692 x1_reg_value.GetAsMemoryData( 693 x1_reg_info, heap_data_up->GetBytes() + 8, 8, 694 byte_order, error)) { 695 DataExtractor data( 696 DataBufferSP(heap_data_up.release()), byte_order, 697 exe_ctx.GetProcessRef().GetAddressByteSize()); 698 699 return_valobj_sp = ValueObjectConstResult::Create( 700 &thread, return_compiler_type, ConstString(""), data); 701 return return_valobj_sp; 702 } 703 } 704 } 705 } 706 } 707 break; 708 case sizeof(uint64_t): 709 if (is_signed) 710 value.GetScalar() = (int64_t)(raw_value); 711 else 712 value.GetScalar() = (uint64_t)(raw_value); 713 success = true; 714 break; 715 716 case sizeof(uint32_t): 717 if (is_signed) 718 value.GetScalar() = (int32_t)(raw_value & UINT32_MAX); 719 else 720 value.GetScalar() = (uint32_t)(raw_value & UINT32_MAX); 721 success = true; 722 break; 723 724 case sizeof(uint16_t): 725 if (is_signed) 726 value.GetScalar() = (int16_t)(raw_value & UINT16_MAX); 727 else 728 value.GetScalar() = (uint16_t)(raw_value & UINT16_MAX); 729 success = true; 730 break; 731 732 case sizeof(uint8_t): 733 if (is_signed) 734 value.GetScalar() = (int8_t)(raw_value & UINT8_MAX); 735 else 736 value.GetScalar() = (uint8_t)(raw_value & UINT8_MAX); 737 success = true; 738 break; 739 } 740 } 741 } 742 } else if (type_flags & eTypeIsFloat) { 743 if (type_flags & eTypeIsComplex) { 744 // Don't handle complex yet. 745 } else { 746 if (*byte_size <= sizeof(long double)) { 747 const RegisterInfo *v0_reg_info = 748 reg_ctx->GetRegisterInfoByName("v0", 0); 749 RegisterValue v0_value; 750 if (reg_ctx->ReadRegister(v0_reg_info, v0_value)) { 751 DataExtractor data; 752 if (v0_value.GetData(data)) { 753 lldb::offset_t offset = 0; 754 if (*byte_size == sizeof(float)) { 755 value.GetScalar() = data.GetFloat(&offset); 756 success = true; 757 } else if (*byte_size == sizeof(double)) { 758 value.GetScalar() = data.GetDouble(&offset); 759 success = true; 760 } else if (*byte_size == sizeof(long double)) { 761 value.GetScalar() = data.GetLongDouble(&offset); 762 success = true; 763 } 764 } 765 } 766 } 767 } 768 } 769 770 if (success) 771 return_valobj_sp = ValueObjectConstResult::Create( 772 thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); 773 } else if (type_flags & eTypeIsVector) { 774 if (*byte_size > 0) { 775 776 const RegisterInfo *v0_info = reg_ctx->GetRegisterInfoByName("v0", 0); 777 778 if (v0_info) { 779 if (*byte_size <= v0_info->byte_size) { 780 std::unique_ptr<DataBufferHeap> heap_data_up( 781 new DataBufferHeap(*byte_size, 0)); 782 const ByteOrder byte_order = exe_ctx.GetProcessRef().GetByteOrder(); 783 RegisterValue reg_value; 784 if (reg_ctx->ReadRegister(v0_info, reg_value)) { 785 Status error; 786 if (reg_value.GetAsMemoryData(v0_info, heap_data_up->GetBytes(), 787 heap_data_up->GetByteSize(), 788 byte_order, error)) { 789 DataExtractor data(DataBufferSP(heap_data_up.release()), 790 byte_order, 791 exe_ctx.GetProcessRef().GetAddressByteSize()); 792 return_valobj_sp = ValueObjectConstResult::Create( 793 &thread, return_compiler_type, ConstString(""), data); 794 } 795 } 796 } 797 } 798 } 799 } else if (type_flags & eTypeIsStructUnion || type_flags & eTypeIsClass) { 800 DataExtractor data; 801 802 uint32_t NGRN = 0; // Search ABI docs for NGRN 803 uint32_t NSRN = 0; // Search ABI docs for NSRN 804 const bool is_return_value = true; 805 if (LoadValueFromConsecutiveGPRRegisters( 806 exe_ctx, reg_ctx, return_compiler_type, is_return_value, NGRN, NSRN, 807 data)) { 808 return_valobj_sp = ValueObjectConstResult::Create( 809 &thread, return_compiler_type, ConstString(""), data); 810 } 811 } 812 return return_valobj_sp; 813 } 814 815 void ABIMacOSX_arm64::Initialize() { 816 PluginManager::RegisterPlugin(GetPluginNameStatic(), pluginDesc, 817 CreateInstance); 818 } 819 820 void ABIMacOSX_arm64::Terminate() { 821 PluginManager::UnregisterPlugin(CreateInstance); 822 } 823 824 // PluginInterface protocol 825 826 ConstString ABIMacOSX_arm64::GetPluginNameStatic() { 827 static ConstString g_plugin_name("ABIMacOSX_arm64"); 828 return g_plugin_name; 829 } 830 831 uint32_t ABIMacOSX_arm64::GetPluginVersion() { return 1; } 832