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 <optional> 12 #include <vector> 13 14 #include "llvm/ADT/STLExtras.h" 15 #include "llvm/TargetParser/Triple.h" 16 17 #include "lldb/Core/Module.h" 18 #include "lldb/Core/PluginManager.h" 19 #include "lldb/Core/Value.h" 20 #include "lldb/Core/ValueObjectConstResult.h" 21 #include "lldb/Symbol/UnwindPlan.h" 22 #include "lldb/Target/Process.h" 23 #include "lldb/Target/RegisterContext.h" 24 #include "lldb/Target/Target.h" 25 #include "lldb/Target/Thread.h" 26 #include "lldb/Utility/ConstString.h" 27 #include "lldb/Utility/LLDBLog.h" 28 #include "lldb/Utility/Log.h" 29 #include "lldb/Utility/RegisterValue.h" 30 #include "lldb/Utility/Scalar.h" 31 #include "lldb/Utility/Status.h" 32 33 #include "Utility/ARM64_DWARF_Registers.h" 34 35 using namespace lldb; 36 using namespace lldb_private; 37 38 static const char *pluginDesc = "Mac OS X ABI for arm64 targets"; 39 40 size_t ABIMacOSX_arm64::GetRedZoneSize() const { return 128; } 41 42 // Static Functions 43 44 ABISP 45 ABIMacOSX_arm64::CreateInstance(ProcessSP process_sp, const ArchSpec &arch) { 46 const llvm::Triple::ArchType arch_type = arch.GetTriple().getArch(); 47 const llvm::Triple::VendorType vendor_type = arch.GetTriple().getVendor(); 48 49 if (vendor_type == llvm::Triple::Apple) { 50 if (arch_type == llvm::Triple::aarch64 || 51 arch_type == llvm::Triple::aarch64_32) { 52 return ABISP( 53 new ABIMacOSX_arm64(std::move(process_sp), MakeMCRegisterInfo(arch))); 54 } 55 } 56 57 return ABISP(); 58 } 59 60 bool ABIMacOSX_arm64::PrepareTrivialCall( 61 Thread &thread, lldb::addr_t sp, lldb::addr_t func_addr, 62 lldb::addr_t return_addr, llvm::ArrayRef<lldb::addr_t> args) const { 63 RegisterContext *reg_ctx = thread.GetRegisterContext().get(); 64 if (!reg_ctx) 65 return false; 66 67 Log *log = GetLog(LLDBLog::Expressions); 68 69 if (log) { 70 StreamString s; 71 s.Printf("ABIMacOSX_arm64::PrepareTrivialCall (tid = 0x%" PRIx64 72 ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64 73 ", return_addr = 0x%" PRIx64, 74 thread.GetID(), (uint64_t)sp, (uint64_t)func_addr, 75 (uint64_t)return_addr); 76 77 for (size_t i = 0; i < args.size(); ++i) 78 s.Printf(", arg%d = 0x%" PRIx64, static_cast<int>(i + 1), args[i]); 79 s.PutCString(")"); 80 log->PutString(s.GetString()); 81 } 82 83 const uint32_t pc_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 84 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC); 85 const uint32_t sp_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 86 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); 87 const uint32_t ra_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 88 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA); 89 90 // x0 - x7 contain first 8 simple args 91 if (args.size() > 8) // TODO handle more than 8 arguments 92 return false; 93 94 for (size_t i = 0; i < args.size(); ++i) { 95 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo( 96 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + i); 97 LLDB_LOGF(log, "About to write arg%d (0x%" PRIx64 ") into %s", 98 static_cast<int>(i + 1), args[i], reg_info->name); 99 if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i])) 100 return false; 101 } 102 103 // Set "lr" to the return address 104 if (!reg_ctx->WriteRegisterFromUnsigned( 105 reg_ctx->GetRegisterInfoAtIndex(ra_reg_num), return_addr)) 106 return false; 107 108 // Set "sp" to the requested value 109 if (!reg_ctx->WriteRegisterFromUnsigned( 110 reg_ctx->GetRegisterInfoAtIndex(sp_reg_num), sp)) 111 return false; 112 113 // Set "pc" to the address requested 114 if (!reg_ctx->WriteRegisterFromUnsigned( 115 reg_ctx->GetRegisterInfoAtIndex(pc_reg_num), func_addr)) 116 return false; 117 118 return true; 119 } 120 121 bool ABIMacOSX_arm64::GetArgumentValues(Thread &thread, 122 ValueList &values) const { 123 uint32_t num_values = values.GetSize(); 124 125 ExecutionContext exe_ctx(thread.shared_from_this()); 126 127 // Extract the register context so we can read arguments from registers 128 129 RegisterContext *reg_ctx = thread.GetRegisterContext().get(); 130 131 if (!reg_ctx) 132 return false; 133 134 addr_t sp = 0; 135 136 for (uint32_t value_idx = 0; value_idx < num_values; ++value_idx) { 137 // We currently only support extracting values with Clang QualTypes. Do we 138 // care about others? 139 Value *value = values.GetValueAtIndex(value_idx); 140 141 if (!value) 142 return false; 143 144 CompilerType value_type = value->GetCompilerType(); 145 std::optional<uint64_t> bit_size = value_type.GetBitSize(&thread); 146 if (!bit_size) 147 return false; 148 149 bool is_signed = false; 150 size_t bit_width = 0; 151 if (value_type.IsIntegerOrEnumerationType(is_signed)) { 152 bit_width = *bit_size; 153 } else if (value_type.IsPointerOrReferenceType()) { 154 bit_width = *bit_size; 155 } else { 156 // We only handle integer, pointer and reference types currently... 157 return false; 158 } 159 160 if (bit_width <= (exe_ctx.GetProcessRef().GetAddressByteSize() * 8)) { 161 if (value_idx < 8) { 162 // Arguments 1-6 are in x0-x5... 163 const RegisterInfo *reg_info = nullptr; 164 // Search by generic ID first, then fall back to by name 165 uint32_t arg_reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 166 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + value_idx); 167 if (arg_reg_num != LLDB_INVALID_REGNUM) { 168 reg_info = reg_ctx->GetRegisterInfoAtIndex(arg_reg_num); 169 } else { 170 switch (value_idx) { 171 case 0: 172 reg_info = reg_ctx->GetRegisterInfoByName("x0"); 173 break; 174 case 1: 175 reg_info = reg_ctx->GetRegisterInfoByName("x1"); 176 break; 177 case 2: 178 reg_info = reg_ctx->GetRegisterInfoByName("x2"); 179 break; 180 case 3: 181 reg_info = reg_ctx->GetRegisterInfoByName("x3"); 182 break; 183 case 4: 184 reg_info = reg_ctx->GetRegisterInfoByName("x4"); 185 break; 186 case 5: 187 reg_info = reg_ctx->GetRegisterInfoByName("x5"); 188 break; 189 case 6: 190 reg_info = reg_ctx->GetRegisterInfoByName("x6"); 191 break; 192 case 7: 193 reg_info = reg_ctx->GetRegisterInfoByName("x7"); 194 break; 195 } 196 } 197 198 if (reg_info) { 199 RegisterValue reg_value; 200 201 if (reg_ctx->ReadRegister(reg_info, reg_value)) { 202 if (is_signed) 203 reg_value.SignExtend(bit_width); 204 if (!reg_value.GetScalarValue(value->GetScalar())) 205 return false; 206 continue; 207 } 208 } 209 return false; 210 } else { 211 if (sp == 0) { 212 // Read the stack pointer if we already haven't read it 213 sp = reg_ctx->GetSP(0); 214 if (sp == 0) 215 return false; 216 } 217 218 // Arguments 5 on up are on the stack 219 const uint32_t arg_byte_size = (bit_width + (8 - 1)) / 8; 220 Status error; 221 if (!exe_ctx.GetProcessRef().ReadScalarIntegerFromMemory( 222 sp, arg_byte_size, is_signed, value->GetScalar(), error)) 223 return false; 224 225 sp += arg_byte_size; 226 // Align up to the next 8 byte boundary if needed 227 if (sp % 8) { 228 sp >>= 3; 229 sp += 1; 230 sp <<= 3; 231 } 232 } 233 } 234 } 235 return true; 236 } 237 238 Status 239 ABIMacOSX_arm64::SetReturnValueObject(lldb::StackFrameSP &frame_sp, 240 lldb::ValueObjectSP &new_value_sp) { 241 Status error; 242 if (!new_value_sp) { 243 error.SetErrorString("Empty value object for return value."); 244 return error; 245 } 246 247 CompilerType return_value_type = new_value_sp->GetCompilerType(); 248 if (!return_value_type) { 249 error.SetErrorString("Null clang type for return value."); 250 return error; 251 } 252 253 Thread *thread = frame_sp->GetThread().get(); 254 255 RegisterContext *reg_ctx = thread->GetRegisterContext().get(); 256 257 if (reg_ctx) { 258 DataExtractor data; 259 Status data_error; 260 const uint64_t byte_size = new_value_sp->GetData(data, data_error); 261 if (data_error.Fail()) { 262 error.SetErrorStringWithFormat( 263 "Couldn't convert return value to raw data: %s", 264 data_error.AsCString()); 265 return error; 266 } 267 268 const uint32_t type_flags = return_value_type.GetTypeInfo(nullptr); 269 if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) { 270 if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) { 271 // Extract the register context so we can read arguments from registers 272 lldb::offset_t offset = 0; 273 if (byte_size <= 16) { 274 const RegisterInfo *x0_info = reg_ctx->GetRegisterInfoByName("x0", 0); 275 if (byte_size <= 8) { 276 uint64_t raw_value = data.GetMaxU64(&offset, byte_size); 277 278 if (!reg_ctx->WriteRegisterFromUnsigned(x0_info, raw_value)) 279 error.SetErrorString("failed to write register x0"); 280 } else { 281 uint64_t raw_value = data.GetMaxU64(&offset, 8); 282 283 if (reg_ctx->WriteRegisterFromUnsigned(x0_info, raw_value)) { 284 const RegisterInfo *x1_info = 285 reg_ctx->GetRegisterInfoByName("x1", 0); 286 raw_value = data.GetMaxU64(&offset, byte_size - offset); 287 288 if (!reg_ctx->WriteRegisterFromUnsigned(x1_info, raw_value)) 289 error.SetErrorString("failed to write register x1"); 290 } 291 } 292 } else { 293 error.SetErrorString("We don't support returning longer than 128 bit " 294 "integer values at present."); 295 } 296 } else if (type_flags & eTypeIsFloat) { 297 if (type_flags & eTypeIsComplex) { 298 // Don't handle complex yet. 299 error.SetErrorString( 300 "returning complex float values are not supported"); 301 } else { 302 const RegisterInfo *v0_info = reg_ctx->GetRegisterInfoByName("v0", 0); 303 304 if (v0_info) { 305 if (byte_size <= 16) { 306 RegisterValue reg_value; 307 error = reg_value.SetValueFromData(*v0_info, data, 0, true); 308 if (error.Success()) 309 if (!reg_ctx->WriteRegister(v0_info, reg_value)) 310 error.SetErrorString("failed to write register v0"); 311 } else { 312 error.SetErrorString("returning float values longer than 128 " 313 "bits are not supported"); 314 } 315 } else 316 error.SetErrorString("v0 register is not available on this target"); 317 } 318 } 319 } else if (type_flags & eTypeIsVector) { 320 if (byte_size > 0) { 321 const RegisterInfo *v0_info = reg_ctx->GetRegisterInfoByName("v0", 0); 322 323 if (v0_info) { 324 if (byte_size <= v0_info->byte_size) { 325 RegisterValue reg_value; 326 error = reg_value.SetValueFromData(*v0_info, data, 0, true); 327 if (error.Success()) { 328 if (!reg_ctx->WriteRegister(v0_info, reg_value)) 329 error.SetErrorString("failed to write register v0"); 330 } 331 } 332 } 333 } 334 } 335 } else { 336 error.SetErrorString("no registers are available"); 337 } 338 339 return error; 340 } 341 342 bool ABIMacOSX_arm64::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) { 343 unwind_plan.Clear(); 344 unwind_plan.SetRegisterKind(eRegisterKindDWARF); 345 346 uint32_t lr_reg_num = arm64_dwarf::lr; 347 uint32_t sp_reg_num = arm64_dwarf::sp; 348 uint32_t pc_reg_num = arm64_dwarf::pc; 349 350 UnwindPlan::RowSP row(new UnwindPlan::Row); 351 352 // Our previous Call Frame Address is the stack pointer 353 row->GetCFAValue().SetIsRegisterPlusOffset(sp_reg_num, 0); 354 355 // Our previous PC is in the LR 356 row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true); 357 358 unwind_plan.AppendRow(row); 359 360 // All other registers are the same. 361 362 unwind_plan.SetSourceName("arm64 at-func-entry default"); 363 unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); 364 365 return true; 366 } 367 368 bool ABIMacOSX_arm64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) { 369 unwind_plan.Clear(); 370 unwind_plan.SetRegisterKind(eRegisterKindDWARF); 371 372 uint32_t fp_reg_num = arm64_dwarf::fp; 373 uint32_t pc_reg_num = arm64_dwarf::pc; 374 375 UnwindPlan::RowSP row(new UnwindPlan::Row); 376 const int32_t ptr_size = 8; 377 378 row->GetCFAValue().SetIsRegisterPlusOffset(fp_reg_num, 2 * ptr_size); 379 row->SetOffset(0); 380 row->SetUnspecifiedRegistersAreUndefined(true); 381 382 row->SetRegisterLocationToAtCFAPlusOffset(fp_reg_num, ptr_size * -2, true); 383 row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * -1, true); 384 385 unwind_plan.AppendRow(row); 386 unwind_plan.SetSourceName("arm64-apple-darwin default unwind plan"); 387 unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); 388 unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo); 389 unwind_plan.SetUnwindPlanForSignalTrap(eLazyBoolNo); 390 return true; 391 } 392 393 // AAPCS64 (Procedure Call Standard for the ARM 64-bit Architecture) says 394 // registers x19 through x28 and sp are callee preserved. v8-v15 are non- 395 // volatile (and specifically only the lower 8 bytes of these regs), the rest 396 // of the fp/SIMD registers are volatile. 397 // 398 // v. https://github.com/ARM-software/abi-aa/blob/main/aapcs64/ 399 400 // We treat x29 as callee preserved also, else the unwinder won't try to 401 // retrieve fp saves. 402 403 bool ABIMacOSX_arm64::RegisterIsVolatile(const RegisterInfo *reg_info) { 404 if (reg_info) { 405 const char *name = reg_info->name; 406 407 // Sometimes we'll be called with the "alternate" name for these registers; 408 // recognize them as non-volatile. 409 410 if (name[0] == 'p' && name[1] == 'c') // pc 411 return false; 412 if (name[0] == 'f' && name[1] == 'p') // fp 413 return false; 414 if (name[0] == 's' && name[1] == 'p') // sp 415 return false; 416 if (name[0] == 'l' && name[1] == 'r') // lr 417 return false; 418 419 if (name[0] == 'x') { 420 // Volatile registers: x0-x18, x30 (lr) 421 // Return false for the non-volatile gpr regs, true for everything else 422 switch (name[1]) { 423 case '1': 424 switch (name[2]) { 425 case '9': 426 return false; // x19 is non-volatile 427 default: 428 return true; 429 } 430 break; 431 case '2': 432 switch (name[2]) { 433 case '0': 434 case '1': 435 case '2': 436 case '3': 437 case '4': 438 case '5': 439 case '6': 440 case '7': 441 case '8': 442 return false; // x20 - 28 are non-volatile 443 case '9': 444 return false; // x29 aka fp treat as non-volatile on Darwin 445 default: 446 return true; 447 } 448 case '3': // x30 aka lr treat as non-volatile 449 if (name[2] == '0') 450 return false; 451 break; 452 default: 453 return true; 454 } 455 } else if (name[0] == 'v' || name[0] == 's' || name[0] == 'd') { 456 // Volatile registers: v0-7, v16-v31 457 // Return false for non-volatile fp/SIMD regs, true for everything else 458 switch (name[1]) { 459 case '8': 460 case '9': 461 return false; // v8-v9 are non-volatile 462 case '1': 463 switch (name[2]) { 464 case '0': 465 case '1': 466 case '2': 467 case '3': 468 case '4': 469 case '5': 470 return false; // v10-v15 are non-volatile 471 default: 472 return true; 473 } 474 default: 475 return true; 476 } 477 } 478 } 479 return true; 480 } 481 482 static bool LoadValueFromConsecutiveGPRRegisters( 483 ExecutionContext &exe_ctx, RegisterContext *reg_ctx, 484 const CompilerType &value_type, 485 bool is_return_value, // false => parameter, true => return value 486 uint32_t &NGRN, // NGRN (see ABI documentation) 487 uint32_t &NSRN, // NSRN (see ABI documentation) 488 DataExtractor &data) { 489 std::optional<uint64_t> byte_size = 490 value_type.GetByteSize(exe_ctx.GetBestExecutionContextScope()); 491 if (!byte_size || *byte_size == 0) 492 return false; 493 494 std::unique_ptr<DataBufferHeap> heap_data_up( 495 new DataBufferHeap(*byte_size, 0)); 496 const ByteOrder byte_order = exe_ctx.GetProcessRef().GetByteOrder(); 497 Status error; 498 499 CompilerType base_type; 500 const uint32_t homogeneous_count = 501 value_type.IsHomogeneousAggregate(&base_type); 502 if (homogeneous_count > 0 && homogeneous_count <= 8) { 503 // Make sure we have enough registers 504 if (NSRN < 8 && (8 - NSRN) >= homogeneous_count) { 505 if (!base_type) 506 return false; 507 std::optional<uint64_t> base_byte_size = 508 base_type.GetByteSize(exe_ctx.GetBestExecutionContextScope()); 509 if (!base_byte_size) 510 return false; 511 uint32_t data_offset = 0; 512 513 for (uint32_t i = 0; i < homogeneous_count; ++i) { 514 char v_name[8]; 515 ::snprintf(v_name, sizeof(v_name), "v%u", NSRN); 516 const RegisterInfo *reg_info = 517 reg_ctx->GetRegisterInfoByName(v_name, 0); 518 if (reg_info == nullptr) 519 return false; 520 521 if (*base_byte_size > reg_info->byte_size) 522 return false; 523 524 RegisterValue reg_value; 525 526 if (!reg_ctx->ReadRegister(reg_info, reg_value)) 527 return false; 528 529 // Make sure we have enough room in "heap_data_up" 530 if ((data_offset + *base_byte_size) <= heap_data_up->GetByteSize()) { 531 const size_t bytes_copied = reg_value.GetAsMemoryData( 532 *reg_info, heap_data_up->GetBytes() + data_offset, 533 *base_byte_size, byte_order, error); 534 if (bytes_copied != *base_byte_size) 535 return false; 536 data_offset += bytes_copied; 537 ++NSRN; 538 } else 539 return false; 540 } 541 data.SetByteOrder(byte_order); 542 data.SetAddressByteSize(exe_ctx.GetProcessRef().GetAddressByteSize()); 543 data.SetData(DataBufferSP(heap_data_up.release())); 544 return true; 545 } 546 } 547 548 const size_t max_reg_byte_size = 16; 549 if (*byte_size <= max_reg_byte_size) { 550 size_t bytes_left = *byte_size; 551 uint32_t data_offset = 0; 552 while (data_offset < *byte_size) { 553 if (NGRN >= 8) 554 return false; 555 556 uint32_t reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 557 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + NGRN); 558 if (reg_num == LLDB_INVALID_REGNUM) 559 return false; 560 561 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoAtIndex(reg_num); 562 if (reg_info == nullptr) 563 return false; 564 565 RegisterValue reg_value; 566 567 if (!reg_ctx->ReadRegister(reg_info, reg_value)) 568 return false; 569 570 const size_t curr_byte_size = std::min<size_t>(8, bytes_left); 571 const size_t bytes_copied = reg_value.GetAsMemoryData( 572 *reg_info, heap_data_up->GetBytes() + data_offset, curr_byte_size, 573 byte_order, error); 574 if (bytes_copied == 0) 575 return false; 576 if (bytes_copied >= bytes_left) 577 break; 578 data_offset += bytes_copied; 579 bytes_left -= bytes_copied; 580 ++NGRN; 581 } 582 } else { 583 const RegisterInfo *reg_info = nullptr; 584 if (is_return_value) { 585 // The Darwin arm64 ABI doesn't write the return location back to x8 586 // before returning from the function the way the x86_64 ABI does. So 587 // we can't reconstruct stack based returns on exit from the function: 588 return false; 589 } else { 590 // We are assuming we are stopped at the first instruction in a function 591 // and that the ABI is being respected so all parameters appear where 592 // they should be (functions with no external linkage can legally violate 593 // the ABI). 594 if (NGRN >= 8) 595 return false; 596 597 uint32_t reg_num = reg_ctx->ConvertRegisterKindToRegisterNumber( 598 eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + NGRN); 599 if (reg_num == LLDB_INVALID_REGNUM) 600 return false; 601 reg_info = reg_ctx->GetRegisterInfoAtIndex(reg_num); 602 if (reg_info == nullptr) 603 return false; 604 ++NGRN; 605 } 606 607 const lldb::addr_t value_addr = 608 reg_ctx->ReadRegisterAsUnsigned(reg_info, LLDB_INVALID_ADDRESS); 609 610 if (value_addr == LLDB_INVALID_ADDRESS) 611 return false; 612 613 if (exe_ctx.GetProcessRef().ReadMemory( 614 value_addr, heap_data_up->GetBytes(), heap_data_up->GetByteSize(), 615 error) != heap_data_up->GetByteSize()) { 616 return false; 617 } 618 } 619 620 data.SetByteOrder(byte_order); 621 data.SetAddressByteSize(exe_ctx.GetProcessRef().GetAddressByteSize()); 622 data.SetData(DataBufferSP(heap_data_up.release())); 623 return true; 624 } 625 626 ValueObjectSP ABIMacOSX_arm64::GetReturnValueObjectImpl( 627 Thread &thread, CompilerType &return_compiler_type) const { 628 ValueObjectSP return_valobj_sp; 629 Value value; 630 631 ExecutionContext exe_ctx(thread.shared_from_this()); 632 if (exe_ctx.GetTargetPtr() == nullptr || exe_ctx.GetProcessPtr() == nullptr) 633 return return_valobj_sp; 634 635 // value.SetContext (Value::eContextTypeClangType, return_compiler_type); 636 value.SetCompilerType(return_compiler_type); 637 638 RegisterContext *reg_ctx = thread.GetRegisterContext().get(); 639 if (!reg_ctx) 640 return return_valobj_sp; 641 642 std::optional<uint64_t> byte_size = return_compiler_type.GetByteSize(&thread); 643 if (!byte_size) 644 return return_valobj_sp; 645 646 const uint32_t type_flags = return_compiler_type.GetTypeInfo(nullptr); 647 if (type_flags & eTypeIsScalar || type_flags & eTypeIsPointer) { 648 value.SetValueType(Value::ValueType::Scalar); 649 650 bool success = false; 651 if (type_flags & eTypeIsInteger || type_flags & eTypeIsPointer) { 652 // Extract the register context so we can read arguments from registers 653 if (*byte_size <= 8) { 654 const RegisterInfo *x0_reg_info = 655 reg_ctx->GetRegisterInfoByName("x0", 0); 656 if (x0_reg_info) { 657 uint64_t raw_value = 658 thread.GetRegisterContext()->ReadRegisterAsUnsigned(x0_reg_info, 659 0); 660 const bool is_signed = (type_flags & eTypeIsSigned) != 0; 661 switch (*byte_size) { 662 default: 663 break; 664 case 16: // uint128_t 665 // In register x0 and x1 666 { 667 const RegisterInfo *x1_reg_info = 668 reg_ctx->GetRegisterInfoByName("x1", 0); 669 670 if (x1_reg_info) { 671 if (*byte_size <= 672 x0_reg_info->byte_size + x1_reg_info->byte_size) { 673 std::unique_ptr<DataBufferHeap> heap_data_up( 674 new DataBufferHeap(*byte_size, 0)); 675 const ByteOrder byte_order = 676 exe_ctx.GetProcessRef().GetByteOrder(); 677 RegisterValue x0_reg_value; 678 RegisterValue x1_reg_value; 679 if (reg_ctx->ReadRegister(x0_reg_info, x0_reg_value) && 680 reg_ctx->ReadRegister(x1_reg_info, x1_reg_value)) { 681 Status error; 682 if (x0_reg_value.GetAsMemoryData( 683 *x0_reg_info, heap_data_up->GetBytes() + 0, 8, 684 byte_order, error) && 685 x1_reg_value.GetAsMemoryData( 686 *x1_reg_info, heap_data_up->GetBytes() + 8, 8, 687 byte_order, error)) { 688 DataExtractor data( 689 DataBufferSP(heap_data_up.release()), byte_order, 690 exe_ctx.GetProcessRef().GetAddressByteSize()); 691 692 return_valobj_sp = ValueObjectConstResult::Create( 693 &thread, return_compiler_type, ConstString(""), data); 694 return return_valobj_sp; 695 } 696 } 697 } 698 } 699 } 700 break; 701 case sizeof(uint64_t): 702 if (is_signed) 703 value.GetScalar() = (int64_t)(raw_value); 704 else 705 value.GetScalar() = (uint64_t)(raw_value); 706 success = true; 707 break; 708 709 case sizeof(uint32_t): 710 if (is_signed) 711 value.GetScalar() = (int32_t)(raw_value & UINT32_MAX); 712 else 713 value.GetScalar() = (uint32_t)(raw_value & UINT32_MAX); 714 success = true; 715 break; 716 717 case sizeof(uint16_t): 718 if (is_signed) 719 value.GetScalar() = (int16_t)(raw_value & UINT16_MAX); 720 else 721 value.GetScalar() = (uint16_t)(raw_value & UINT16_MAX); 722 success = true; 723 break; 724 725 case sizeof(uint8_t): 726 if (is_signed) 727 value.GetScalar() = (int8_t)(raw_value & UINT8_MAX); 728 else 729 value.GetScalar() = (uint8_t)(raw_value & UINT8_MAX); 730 success = true; 731 break; 732 } 733 } 734 } 735 } else if (type_flags & eTypeIsFloat) { 736 if (type_flags & eTypeIsComplex) { 737 // Don't handle complex yet. 738 } else { 739 if (*byte_size <= sizeof(long double)) { 740 const RegisterInfo *v0_reg_info = 741 reg_ctx->GetRegisterInfoByName("v0", 0); 742 RegisterValue v0_value; 743 if (reg_ctx->ReadRegister(v0_reg_info, v0_value)) { 744 DataExtractor data; 745 if (v0_value.GetData(data)) { 746 lldb::offset_t offset = 0; 747 if (*byte_size == sizeof(float)) { 748 value.GetScalar() = data.GetFloat(&offset); 749 success = true; 750 } else if (*byte_size == sizeof(double)) { 751 value.GetScalar() = data.GetDouble(&offset); 752 success = true; 753 } else if (*byte_size == sizeof(long double)) { 754 value.GetScalar() = data.GetLongDouble(&offset); 755 success = true; 756 } 757 } 758 } 759 } 760 } 761 } 762 763 if (success) 764 return_valobj_sp = ValueObjectConstResult::Create( 765 thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); 766 } else if (type_flags & eTypeIsVector) { 767 if (*byte_size > 0) { 768 769 const RegisterInfo *v0_info = reg_ctx->GetRegisterInfoByName("v0", 0); 770 771 if (v0_info) { 772 if (*byte_size <= v0_info->byte_size) { 773 std::unique_ptr<DataBufferHeap> heap_data_up( 774 new DataBufferHeap(*byte_size, 0)); 775 const ByteOrder byte_order = exe_ctx.GetProcessRef().GetByteOrder(); 776 RegisterValue reg_value; 777 if (reg_ctx->ReadRegister(v0_info, reg_value)) { 778 Status error; 779 if (reg_value.GetAsMemoryData(*v0_info, heap_data_up->GetBytes(), 780 heap_data_up->GetByteSize(), 781 byte_order, error)) { 782 DataExtractor data(DataBufferSP(heap_data_up.release()), 783 byte_order, 784 exe_ctx.GetProcessRef().GetAddressByteSize()); 785 return_valobj_sp = ValueObjectConstResult::Create( 786 &thread, return_compiler_type, ConstString(""), data); 787 } 788 } 789 } 790 } 791 } 792 } else if (type_flags & eTypeIsStructUnion || type_flags & eTypeIsClass) { 793 DataExtractor data; 794 795 uint32_t NGRN = 0; // Search ABI docs for NGRN 796 uint32_t NSRN = 0; // Search ABI docs for NSRN 797 const bool is_return_value = true; 798 if (LoadValueFromConsecutiveGPRRegisters( 799 exe_ctx, reg_ctx, return_compiler_type, is_return_value, NGRN, NSRN, 800 data)) { 801 return_valobj_sp = ValueObjectConstResult::Create( 802 &thread, return_compiler_type, ConstString(""), data); 803 } 804 } 805 return return_valobj_sp; 806 } 807 808 addr_t ABIMacOSX_arm64::FixCodeAddress(addr_t pc) { 809 addr_t pac_sign_extension = 0x0080000000000000ULL; 810 addr_t tbi_mask = 0xff80000000000000ULL; 811 addr_t mask = 0; 812 813 if (ProcessSP process_sp = GetProcessSP()) { 814 mask = process_sp->GetCodeAddressMask(); 815 if (pc & pac_sign_extension) { 816 addr_t highmem_mask = process_sp->GetHighmemCodeAddressMask(); 817 if (highmem_mask) 818 mask = highmem_mask; 819 } 820 } 821 if (mask == 0) 822 mask = tbi_mask; 823 824 return (pc & pac_sign_extension) ? pc | mask : pc & (~mask); 825 } 826 827 addr_t ABIMacOSX_arm64::FixDataAddress(addr_t pc) { 828 addr_t pac_sign_extension = 0x0080000000000000ULL; 829 addr_t tbi_mask = 0xff80000000000000ULL; 830 addr_t mask = 0; 831 832 if (ProcessSP process_sp = GetProcessSP()) { 833 mask = process_sp->GetDataAddressMask(); 834 if (pc & pac_sign_extension) { 835 addr_t highmem_mask = process_sp->GetHighmemDataAddressMask(); 836 if (highmem_mask) 837 mask = highmem_mask; 838 } 839 } 840 if (mask == 0) 841 mask = tbi_mask; 842 843 return (pc & pac_sign_extension) ? pc | mask : pc & (~mask); 844 } 845 846 void ABIMacOSX_arm64::Initialize() { 847 PluginManager::RegisterPlugin(GetPluginNameStatic(), pluginDesc, 848 CreateInstance); 849 } 850 851 void ABIMacOSX_arm64::Terminate() { 852 PluginManager::UnregisterPlugin(CreateInstance); 853 } 854