957 lines · cpp
1//===-- ABISysV_ppc.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-exception6//7//===----------------------------------------------------------------------===//8 9#include "ABISysV_ppc.h"10 11#include "llvm/ADT/STLExtras.h"12#include "llvm/TargetParser/Triple.h"13 14#include "lldb/Core/Module.h"15#include "lldb/Core/PluginManager.h"16#include "lldb/Core/Value.h"17#include "lldb/Symbol/UnwindPlan.h"18#include "lldb/Target/Process.h"19#include "lldb/Target/RegisterContext.h"20#include "lldb/Target/StackFrame.h"21#include "lldb/Target/Target.h"22#include "lldb/Target/Thread.h"23#include "lldb/Utility/ConstString.h"24#include "lldb/Utility/DataExtractor.h"25#include "lldb/Utility/LLDBLog.h"26#include "lldb/Utility/Log.h"27#include "lldb/Utility/RegisterValue.h"28#include "lldb/Utility/Status.h"29#include "lldb/ValueObject/ValueObjectConstResult.h"30#include "lldb/ValueObject/ValueObjectMemory.h"31#include "lldb/ValueObject/ValueObjectRegister.h"32#include <optional>33 34using namespace lldb;35using namespace lldb_private;36 37LLDB_PLUGIN_DEFINE(ABISysV_ppc)38 39enum dwarf_regnums {40 dwarf_r0 = 0,41 dwarf_r1,42 dwarf_r2,43 dwarf_r3,44 dwarf_r4,45 dwarf_r5,46 dwarf_r6,47 dwarf_r7,48 dwarf_r8,49 dwarf_r9,50 dwarf_r10,51 dwarf_r11,52 dwarf_r12,53 dwarf_r13,54 dwarf_r14,55 dwarf_r15,56 dwarf_r16,57 dwarf_r17,58 dwarf_r18,59 dwarf_r19,60 dwarf_r20,61 dwarf_r21,62 dwarf_r22,63 dwarf_r23,64 dwarf_r24,65 dwarf_r25,66 dwarf_r26,67 dwarf_r27,68 dwarf_r28,69 dwarf_r29,70 dwarf_r30,71 dwarf_r31,72 dwarf_f0,73 dwarf_f1,74 dwarf_f2,75 dwarf_f3,76 dwarf_f4,77 dwarf_f5,78 dwarf_f6,79 dwarf_f7,80 dwarf_f8,81 dwarf_f9,82 dwarf_f10,83 dwarf_f11,84 dwarf_f12,85 dwarf_f13,86 dwarf_f14,87 dwarf_f15,88 dwarf_f16,89 dwarf_f17,90 dwarf_f18,91 dwarf_f19,92 dwarf_f20,93 dwarf_f21,94 dwarf_f22,95 dwarf_f23,96 dwarf_f24,97 dwarf_f25,98 dwarf_f26,99 dwarf_f27,100 dwarf_f28,101 dwarf_f29,102 dwarf_f30,103 dwarf_f31,104 dwarf_cr,105 dwarf_fpscr,106 dwarf_xer = 101,107 dwarf_lr = 108,108 dwarf_ctr,109 dwarf_pc,110 dwarf_cfa,111};112 113// Note that the size and offset will be updated by platform-specific classes.114#define DEFINE_GPR(reg, alt, kind1, kind2, kind3, kind4) \115 { \116 #reg, alt, 8, 0, eEncodingUint, eFormatHex, {kind1, kind2, kind3, kind4 }, \117 nullptr, nullptr, nullptr, \118 }119 120static const RegisterInfo g_register_infos[] = {121 // General purpose registers. eh_frame, DWARF,122 // Generic, Process Plugin123 DEFINE_GPR(r0, nullptr, dwarf_r0, dwarf_r0, LLDB_INVALID_REGNUM,124 LLDB_INVALID_REGNUM),125 DEFINE_GPR(r1, nullptr, dwarf_r1, dwarf_r1, LLDB_REGNUM_GENERIC_SP,126 LLDB_INVALID_REGNUM),127 DEFINE_GPR(r2, nullptr, dwarf_r2, dwarf_r2, LLDB_INVALID_REGNUM,128 LLDB_INVALID_REGNUM),129 DEFINE_GPR(r3, nullptr, dwarf_r3, dwarf_r3, LLDB_REGNUM_GENERIC_ARG1,130 LLDB_INVALID_REGNUM),131 DEFINE_GPR(r4, nullptr, dwarf_r4, dwarf_r4, LLDB_REGNUM_GENERIC_ARG2,132 LLDB_INVALID_REGNUM),133 DEFINE_GPR(r5, nullptr, dwarf_r5, dwarf_r5, LLDB_REGNUM_GENERIC_ARG3,134 LLDB_INVALID_REGNUM),135 DEFINE_GPR(r6, nullptr, dwarf_r6, dwarf_r6, LLDB_REGNUM_GENERIC_ARG4,136 LLDB_INVALID_REGNUM),137 DEFINE_GPR(r7, nullptr, dwarf_r7, dwarf_r7, LLDB_REGNUM_GENERIC_ARG5,138 LLDB_INVALID_REGNUM),139 DEFINE_GPR(r8, nullptr, dwarf_r8, dwarf_r8, LLDB_REGNUM_GENERIC_ARG6,140 LLDB_INVALID_REGNUM),141 DEFINE_GPR(r9, nullptr, dwarf_r9, dwarf_r9, LLDB_REGNUM_GENERIC_ARG7,142 LLDB_INVALID_REGNUM),143 DEFINE_GPR(r10, nullptr, dwarf_r10, dwarf_r10, LLDB_REGNUM_GENERIC_ARG8,144 LLDB_INVALID_REGNUM),145 DEFINE_GPR(r11, nullptr, dwarf_r11, dwarf_r11, LLDB_INVALID_REGNUM,146 LLDB_INVALID_REGNUM),147 DEFINE_GPR(r12, nullptr, dwarf_r12, dwarf_r12, LLDB_INVALID_REGNUM,148 LLDB_INVALID_REGNUM),149 DEFINE_GPR(r13, nullptr, dwarf_r13, dwarf_r13, LLDB_INVALID_REGNUM,150 LLDB_INVALID_REGNUM),151 DEFINE_GPR(r14, nullptr, dwarf_r14, dwarf_r14, LLDB_INVALID_REGNUM,152 LLDB_INVALID_REGNUM),153 DEFINE_GPR(r15, nullptr, dwarf_r15, dwarf_r15, LLDB_INVALID_REGNUM,154 LLDB_INVALID_REGNUM),155 DEFINE_GPR(r16, nullptr, dwarf_r16, dwarf_r16, LLDB_INVALID_REGNUM,156 LLDB_INVALID_REGNUM),157 DEFINE_GPR(r17, nullptr, dwarf_r17, dwarf_r17, LLDB_INVALID_REGNUM,158 LLDB_INVALID_REGNUM),159 DEFINE_GPR(r18, nullptr, dwarf_r18, dwarf_r18, LLDB_INVALID_REGNUM,160 LLDB_INVALID_REGNUM),161 DEFINE_GPR(r19, nullptr, dwarf_r19, dwarf_r19, LLDB_INVALID_REGNUM,162 LLDB_INVALID_REGNUM),163 DEFINE_GPR(r20, nullptr, dwarf_r20, dwarf_r20, LLDB_INVALID_REGNUM,164 LLDB_INVALID_REGNUM),165 DEFINE_GPR(r21, nullptr, dwarf_r21, dwarf_r21, LLDB_INVALID_REGNUM,166 LLDB_INVALID_REGNUM),167 DEFINE_GPR(r22, nullptr, dwarf_r22, dwarf_r22, LLDB_INVALID_REGNUM,168 LLDB_INVALID_REGNUM),169 DEFINE_GPR(r23, nullptr, dwarf_r23, dwarf_r23, LLDB_INVALID_REGNUM,170 LLDB_INVALID_REGNUM),171 DEFINE_GPR(r24, nullptr, dwarf_r24, dwarf_r24, LLDB_INVALID_REGNUM,172 LLDB_INVALID_REGNUM),173 DEFINE_GPR(r25, nullptr, dwarf_r25, dwarf_r25, LLDB_INVALID_REGNUM,174 LLDB_INVALID_REGNUM),175 DEFINE_GPR(r26, nullptr, dwarf_r26, dwarf_r26, LLDB_INVALID_REGNUM,176 LLDB_INVALID_REGNUM),177 DEFINE_GPR(r27, nullptr, dwarf_r27, dwarf_r27, LLDB_INVALID_REGNUM,178 LLDB_INVALID_REGNUM),179 DEFINE_GPR(r28, nullptr, dwarf_r28, dwarf_r28, LLDB_INVALID_REGNUM,180 LLDB_INVALID_REGNUM),181 DEFINE_GPR(r29, nullptr, dwarf_r29, dwarf_r29, LLDB_INVALID_REGNUM,182 LLDB_INVALID_REGNUM),183 DEFINE_GPR(r30, nullptr, dwarf_r30, dwarf_r30, LLDB_INVALID_REGNUM,184 LLDB_INVALID_REGNUM),185 DEFINE_GPR(r31, nullptr, dwarf_r31, dwarf_r31, LLDB_INVALID_REGNUM,186 LLDB_INVALID_REGNUM),187 DEFINE_GPR(lr, nullptr, dwarf_lr, dwarf_lr, LLDB_REGNUM_GENERIC_RA,188 LLDB_INVALID_REGNUM),189 DEFINE_GPR(cr, nullptr, dwarf_cr, dwarf_cr, LLDB_REGNUM_GENERIC_FLAGS,190 LLDB_INVALID_REGNUM),191 DEFINE_GPR(xer, nullptr, dwarf_xer, dwarf_xer, LLDB_INVALID_REGNUM,192 LLDB_INVALID_REGNUM),193 DEFINE_GPR(ctr, nullptr, dwarf_ctr, dwarf_ctr, LLDB_INVALID_REGNUM,194 LLDB_INVALID_REGNUM),195 DEFINE_GPR(pc, nullptr, dwarf_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC,196 LLDB_INVALID_REGNUM),197 {nullptr,198 nullptr,199 8,200 0,201 eEncodingUint,202 eFormatHex,203 {dwarf_cfa, dwarf_cfa, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM},204 nullptr,205 nullptr,206 nullptr,207 }};208 209static const uint32_t k_num_register_infos = std::size(g_register_infos);210 211const lldb_private::RegisterInfo *212ABISysV_ppc::GetRegisterInfoArray(uint32_t &count) {213 count = k_num_register_infos;214 return g_register_infos;215}216 217size_t ABISysV_ppc::GetRedZoneSize() const { return 224; }218 219// Static Functions220 221ABISP222ABISysV_ppc::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) {223 if (arch.GetTriple().getArch() == llvm::Triple::ppc) {224 return ABISP(225 new ABISysV_ppc(std::move(process_sp), MakeMCRegisterInfo(arch)));226 }227 return ABISP();228}229 230bool ABISysV_ppc::PrepareTrivialCall(Thread &thread, addr_t sp,231 addr_t func_addr, addr_t return_addr,232 llvm::ArrayRef<addr_t> args) const {233 Log *log = GetLog(LLDBLog::Expressions);234 235 if (log) {236 StreamString s;237 s.Printf("ABISysV_ppc::PrepareTrivialCall (tid = 0x%" PRIx64238 ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64239 ", return_addr = 0x%" PRIx64,240 thread.GetID(), (uint64_t)sp, (uint64_t)func_addr,241 (uint64_t)return_addr);242 243 for (size_t i = 0; i < args.size(); ++i)244 s.Printf(", arg%" PRIu64 " = 0x%" PRIx64, static_cast<uint64_t>(i + 1),245 args[i]);246 s.PutCString(")");247 log->PutString(s.GetString());248 }249 250 RegisterContext *reg_ctx = thread.GetRegisterContext().get();251 if (!reg_ctx)252 return false;253 254 const RegisterInfo *reg_info = nullptr;255 256 if (args.size() > 8) // TODO handle more than 8 arguments257 return false;258 259 for (size_t i = 0; i < args.size(); ++i) {260 reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric,261 LLDB_REGNUM_GENERIC_ARG1 + i);262 LLDB_LOGF(log, "About to write arg%" PRIu64 " (0x%" PRIx64 ") into %s",263 static_cast<uint64_t>(i + 1), args[i], reg_info->name);264 if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i]))265 return false;266 }267 268 // First, align the SP269 270 LLDB_LOGF(log, "16-byte aligning SP: 0x%" PRIx64 " to 0x%" PRIx64,271 (uint64_t)sp, (uint64_t)(sp & ~0xfull));272 273 sp &= ~(0xfull); // 16-byte alignment274 275 sp -= 8;276 277 Status error;278 const RegisterInfo *pc_reg_info =279 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);280 const RegisterInfo *sp_reg_info =281 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP);282 ProcessSP process_sp(thread.GetProcess());283 284 RegisterValue reg_value;285 286 LLDB_LOGF(log,287 "Pushing the return address onto the stack: 0x%" PRIx64288 ": 0x%" PRIx64,289 (uint64_t)sp, (uint64_t)return_addr);290 291 // Save return address onto the stack292 if (!process_sp->WritePointerToMemory(sp, return_addr, error))293 return false;294 295 // %r1 is set to the actual stack value.296 297 LLDB_LOGF(log, "Writing SP: 0x%" PRIx64, (uint64_t)sp);298 299 if (!reg_ctx->WriteRegisterFromUnsigned(sp_reg_info, sp))300 return false;301 302 // %pc is set to the address of the called function.303 304 LLDB_LOGF(log, "Writing IP: 0x%" PRIx64, (uint64_t)func_addr);305 306 if (!reg_ctx->WriteRegisterFromUnsigned(pc_reg_info, func_addr))307 return false;308 309 return true;310}311 312static bool ReadIntegerArgument(Scalar &scalar, unsigned int bit_width,313 bool is_signed, Thread &thread,314 uint32_t *argument_register_ids,315 unsigned int ¤t_argument_register,316 addr_t ¤t_stack_argument) {317 if (bit_width > 64)318 return false; // Scalar can't hold large integer arguments319 320 if (current_argument_register < 6) {321 scalar = thread.GetRegisterContext()->ReadRegisterAsUnsigned(322 argument_register_ids[current_argument_register], 0);323 current_argument_register++;324 if (is_signed)325 scalar.SignExtend(bit_width);326 } else {327 uint32_t byte_size = (bit_width + (8 - 1)) / 8;328 Status error;329 if (thread.GetProcess()->ReadScalarIntegerFromMemory(330 current_stack_argument, byte_size, is_signed, scalar, error)) {331 current_stack_argument += byte_size;332 return true;333 }334 return false;335 }336 return true;337}338 339bool ABISysV_ppc::GetArgumentValues(Thread &thread, ValueList &values) const {340 unsigned int num_values = values.GetSize();341 unsigned int value_index;342 343 // Extract the register context so we can read arguments from registers344 345 RegisterContext *reg_ctx = thread.GetRegisterContext().get();346 347 if (!reg_ctx)348 return false;349 350 // Get the pointer to the first stack argument so we have a place to start351 // when reading data352 353 addr_t sp = reg_ctx->GetSP(0);354 355 if (!sp)356 return false;357 358 addr_t current_stack_argument = sp + 48; // jump over return address359 360 uint32_t argument_register_ids[8];361 362 argument_register_ids[0] =363 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1)364 ->kinds[eRegisterKindLLDB];365 argument_register_ids[1] =366 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2)367 ->kinds[eRegisterKindLLDB];368 argument_register_ids[2] =369 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG3)370 ->kinds[eRegisterKindLLDB];371 argument_register_ids[3] =372 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG4)373 ->kinds[eRegisterKindLLDB];374 argument_register_ids[4] =375 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG5)376 ->kinds[eRegisterKindLLDB];377 argument_register_ids[5] =378 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG6)379 ->kinds[eRegisterKindLLDB];380 argument_register_ids[6] =381 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG7)382 ->kinds[eRegisterKindLLDB];383 argument_register_ids[7] =384 reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG8)385 ->kinds[eRegisterKindLLDB];386 387 unsigned int current_argument_register = 0;388 389 for (value_index = 0; value_index < num_values; ++value_index) {390 Value *value = values.GetValueAtIndex(value_index);391 392 if (!value)393 return false;394 395 // We currently only support extracting values with Clang QualTypes. Do we396 // care about others?397 CompilerType compiler_type = value->GetCompilerType();398 std::optional<uint64_t> bit_size =399 llvm::expectedToOptional(compiler_type.GetBitSize(&thread));400 if (!bit_size)401 return false;402 bool is_signed;403 if (compiler_type.IsIntegerOrEnumerationType(is_signed))404 ReadIntegerArgument(value->GetScalar(), *bit_size, is_signed, thread,405 argument_register_ids, current_argument_register,406 current_stack_argument);407 else if (compiler_type.IsPointerType())408 ReadIntegerArgument(value->GetScalar(), *bit_size, false, thread,409 argument_register_ids, current_argument_register,410 current_stack_argument);411 }412 413 return true;414}415 416Status ABISysV_ppc::SetReturnValueObject(lldb::StackFrameSP &frame_sp,417 lldb::ValueObjectSP &new_value_sp) {418 Status error;419 if (!new_value_sp)420 return Status::FromErrorString("Empty value object for return value.");421 422 CompilerType compiler_type = new_value_sp->GetCompilerType();423 if (!compiler_type)424 return Status::FromErrorString("Null clang type for return value.");425 426 Thread *thread = frame_sp->GetThread().get();427 428 bool is_signed;429 bool is_complex;430 431 RegisterContext *reg_ctx = thread->GetRegisterContext().get();432 433 bool set_it_simple = false;434 if (compiler_type.IsIntegerOrEnumerationType(is_signed) ||435 compiler_type.IsPointerType()) {436 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName("r3", 0);437 438 DataExtractor data;439 Status data_error;440 size_t num_bytes = new_value_sp->GetData(data, data_error);441 if (data_error.Fail())442 return Status::FromErrorStringWithFormat(443 "Couldn't convert return value to raw data: %s",444 data_error.AsCString());445 lldb::offset_t offset = 0;446 if (num_bytes <= 8) {447 uint64_t raw_value = data.GetMaxU64(&offset, num_bytes);448 449 if (reg_ctx->WriteRegisterFromUnsigned(reg_info, raw_value))450 set_it_simple = true;451 } else {452 error = Status::FromErrorString(453 "We don't support returning longer than 64 bit "454 "integer values at present.");455 }456 } else if (compiler_type.IsFloatingPointType(is_complex)) {457 if (is_complex)458 error = Status::FromErrorString(459 "We don't support returning complex values at present");460 else {461 std::optional<uint64_t> bit_width =462 llvm::expectedToOptional(compiler_type.GetBitSize(frame_sp.get()));463 if (!bit_width) {464 error = Status::FromErrorString("can't get type size");465 return error;466 }467 if (*bit_width <= 64) {468 DataExtractor data;469 Status data_error;470 size_t num_bytes = new_value_sp->GetData(data, data_error);471 if (data_error.Fail()) {472 error = Status::FromErrorStringWithFormat(473 "Couldn't convert return value to raw data: %s",474 data_error.AsCString());475 return error;476 }477 478 unsigned char buffer[16];479 ByteOrder byte_order = data.GetByteOrder();480 481 data.CopyByteOrderedData(0, num_bytes, buffer, 16, byte_order);482 set_it_simple = true;483 } else {484 // FIXME - don't know how to do 80 bit long doubles yet.485 error = Status::FromErrorString(486 "We don't support returning float values > 64 bits at present");487 }488 }489 }490 491 if (!set_it_simple) {492 // Okay we've got a structure or something that doesn't fit in a simple493 // register. We should figure out where it really goes, but we don't494 // support this yet.495 error = Status::FromErrorString(496 "We only support setting simple integer and float "497 "return types at present.");498 }499 500 return error;501}502 503ValueObjectSP ABISysV_ppc::GetReturnValueObjectSimple(504 Thread &thread, CompilerType &return_compiler_type) const {505 ValueObjectSP return_valobj_sp;506 Value value;507 508 if (!return_compiler_type)509 return return_valobj_sp;510 511 // value.SetContext (Value::eContextTypeClangType, return_value_type);512 value.SetCompilerType(return_compiler_type);513 514 RegisterContext *reg_ctx = thread.GetRegisterContext().get();515 if (!reg_ctx)516 return return_valobj_sp;517 518 const uint32_t type_flags = return_compiler_type.GetTypeInfo();519 if (type_flags & eTypeIsScalar) {520 value.SetValueType(Value::ValueType::Scalar);521 522 bool success = false;523 if (type_flags & eTypeIsInteger) {524 // Extract the register context so we can read arguments from registers525 526 std::optional<uint64_t> byte_size =527 llvm::expectedToOptional(return_compiler_type.GetByteSize(&thread));528 if (!byte_size)529 return return_valobj_sp;530 uint64_t raw_value = thread.GetRegisterContext()->ReadRegisterAsUnsigned(531 reg_ctx->GetRegisterInfoByName("r3", 0), 0);532 const bool is_signed = (type_flags & eTypeIsSigned) != 0;533 switch (*byte_size) {534 default:535 break;536 537 case sizeof(uint64_t):538 if (is_signed)539 value.GetScalar() = (int64_t)(raw_value);540 else541 value.GetScalar() = (uint64_t)(raw_value);542 success = true;543 break;544 545 case sizeof(uint32_t):546 if (is_signed)547 value.GetScalar() = (int32_t)(raw_value & UINT32_MAX);548 else549 value.GetScalar() = (uint32_t)(raw_value & UINT32_MAX);550 success = true;551 break;552 553 case sizeof(uint16_t):554 if (is_signed)555 value.GetScalar() = (int16_t)(raw_value & UINT16_MAX);556 else557 value.GetScalar() = (uint16_t)(raw_value & UINT16_MAX);558 success = true;559 break;560 561 case sizeof(uint8_t):562 if (is_signed)563 value.GetScalar() = (int8_t)(raw_value & UINT8_MAX);564 else565 value.GetScalar() = (uint8_t)(raw_value & UINT8_MAX);566 success = true;567 break;568 }569 } else if (type_flags & eTypeIsFloat) {570 if (type_flags & eTypeIsComplex) {571 // Don't handle complex yet.572 } else {573 std::optional<uint64_t> byte_size =574 llvm::expectedToOptional(return_compiler_type.GetByteSize(&thread));575 if (byte_size && *byte_size <= sizeof(long double)) {576 const RegisterInfo *f1_info = reg_ctx->GetRegisterInfoByName("f1", 0);577 RegisterValue f1_value;578 if (reg_ctx->ReadRegister(f1_info, f1_value)) {579 DataExtractor data;580 if (f1_value.GetData(data)) {581 lldb::offset_t offset = 0;582 if (*byte_size == sizeof(float)) {583 value.GetScalar() = (float)data.GetFloat(&offset);584 success = true;585 } else if (*byte_size == sizeof(double)) {586 value.GetScalar() = (double)data.GetDouble(&offset);587 success = true;588 }589 }590 }591 }592 }593 }594 595 if (success)596 return_valobj_sp = ValueObjectConstResult::Create(597 thread.GetStackFrameAtIndex(0).get(), value, ConstString(""));598 } else if (type_flags & eTypeIsPointer) {599 unsigned r3_id =600 reg_ctx->GetRegisterInfoByName("r3", 0)->kinds[eRegisterKindLLDB];601 value.GetScalar() =602 (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r3_id, 0);603 value.SetValueType(Value::ValueType::Scalar);604 return_valobj_sp = ValueObjectConstResult::Create(605 thread.GetStackFrameAtIndex(0).get(), value, ConstString(""));606 } else if (type_flags & eTypeIsVector) {607 std::optional<uint64_t> byte_size =608 llvm::expectedToOptional(return_compiler_type.GetByteSize(&thread));609 if (byte_size && *byte_size > 0) {610 const RegisterInfo *altivec_reg = reg_ctx->GetRegisterInfoByName("v2", 0);611 if (altivec_reg) {612 if (*byte_size <= altivec_reg->byte_size) {613 ProcessSP process_sp(thread.GetProcess());614 if (process_sp) {615 std::unique_ptr<DataBufferHeap> heap_data_up(616 new DataBufferHeap(*byte_size, 0));617 const ByteOrder byte_order = process_sp->GetByteOrder();618 RegisterValue reg_value;619 if (reg_ctx->ReadRegister(altivec_reg, reg_value)) {620 Status error;621 if (reg_value.GetAsMemoryData(622 *altivec_reg, heap_data_up->GetBytes(),623 heap_data_up->GetByteSize(), byte_order, error)) {624 DataExtractor data(DataBufferSP(heap_data_up.release()),625 byte_order,626 process_sp->GetTarget()627 .GetArchitecture()628 .GetAddressByteSize());629 return_valobj_sp = ValueObjectConstResult::Create(630 &thread, return_compiler_type, ConstString(""), data);631 }632 }633 }634 }635 }636 }637 }638 639 return return_valobj_sp;640}641 642ValueObjectSP ABISysV_ppc::GetReturnValueObjectImpl(643 Thread &thread, CompilerType &return_compiler_type) const {644 ValueObjectSP return_valobj_sp;645 646 if (!return_compiler_type)647 return return_valobj_sp;648 649 ExecutionContext exe_ctx(thread.shared_from_this());650 return_valobj_sp = GetReturnValueObjectSimple(thread, return_compiler_type);651 if (return_valobj_sp)652 return return_valobj_sp;653 654 RegisterContextSP reg_ctx_sp = thread.GetRegisterContext();655 if (!reg_ctx_sp)656 return return_valobj_sp;657 658 std::optional<uint64_t> bit_width =659 llvm::expectedToOptional(return_compiler_type.GetBitSize(&thread));660 if (!bit_width)661 return return_valobj_sp;662 if (return_compiler_type.IsAggregateType()) {663 Target *target = exe_ctx.GetTargetPtr();664 bool is_memory = true;665 if (*bit_width <= 128) {666 ByteOrder target_byte_order = target->GetArchitecture().GetByteOrder();667 WritableDataBufferSP data_sp(new DataBufferHeap(16, 0));668 DataExtractor return_ext(data_sp, target_byte_order,669 target->GetArchitecture().GetAddressByteSize());670 671 const RegisterInfo *r3_info = reg_ctx_sp->GetRegisterInfoByName("r3", 0);672 const RegisterInfo *rdx_info =673 reg_ctx_sp->GetRegisterInfoByName("rdx", 0);674 675 RegisterValue r3_value, rdx_value;676 reg_ctx_sp->ReadRegister(r3_info, r3_value);677 reg_ctx_sp->ReadRegister(rdx_info, rdx_value);678 679 DataExtractor r3_data, rdx_data;680 681 r3_value.GetData(r3_data);682 rdx_value.GetData(rdx_data);683 684 uint32_t integer_bytes =685 0; // Tracks how much of the r3/rds registers we've consumed so far686 687 const uint32_t num_children = return_compiler_type.GetNumFields();688 689 // Since we are in the small struct regime, assume we are not in memory.690 is_memory = false;691 692 for (uint32_t idx = 0; idx < num_children; idx++) {693 std::string name;694 uint64_t field_bit_offset = 0;695 bool is_signed;696 bool is_complex;697 698 CompilerType field_compiler_type = return_compiler_type.GetFieldAtIndex(699 idx, name, &field_bit_offset, nullptr, nullptr);700 std::optional<uint64_t> field_bit_width =701 llvm::expectedToOptional(field_compiler_type.GetBitSize(&thread));702 if (!field_bit_width)703 return return_valobj_sp;704 705 // If there are any unaligned fields, this is stored in memory.706 if (field_bit_offset % *field_bit_width != 0) {707 is_memory = true;708 break;709 }710 711 uint32_t field_byte_width = *field_bit_width / 8;712 uint32_t field_byte_offset = field_bit_offset / 8;713 714 DataExtractor *copy_from_extractor = nullptr;715 uint32_t copy_from_offset = 0;716 717 if (field_compiler_type.IsIntegerOrEnumerationType(is_signed) ||718 field_compiler_type.IsPointerType()) {719 if (integer_bytes < 8) {720 if (integer_bytes + field_byte_width <= 8) {721 // This is in RAX, copy from register to our result structure:722 copy_from_extractor = &r3_data;723 copy_from_offset = integer_bytes;724 integer_bytes += field_byte_width;725 } else {726 // The next field wouldn't fit in the remaining space, so we727 // pushed it to rdx.728 copy_from_extractor = &rdx_data;729 copy_from_offset = 0;730 integer_bytes = 8 + field_byte_width;731 }732 } else if (integer_bytes + field_byte_width <= 16) {733 copy_from_extractor = &rdx_data;734 copy_from_offset = integer_bytes - 8;735 integer_bytes += field_byte_width;736 } else {737 // The last field didn't fit. I can't see how that would happen738 // w/o the overall size being greater than 16 bytes. For now,739 // return a nullptr return value object.740 return return_valobj_sp;741 }742 } else if (field_compiler_type.IsFloatingPointType(is_complex)) {743 // Structs with long doubles are always passed in memory.744 if (*field_bit_width == 128) {745 is_memory = true;746 break;747 } else if (*field_bit_width == 64) {748 copy_from_offset = 0;749 } else if (*field_bit_width == 32) {750 // This one is kind of complicated. If we are in an "eightbyte"751 // with another float, we'll be stuffed into an xmm register with752 // it. If we are in an "eightbyte" with one or more ints, then we753 // will be stuffed into the appropriate GPR with them.754 bool in_gpr;755 if (field_byte_offset % 8 == 0) {756 // We are at the beginning of one of the eightbytes, so check the757 // next element (if any)758 if (idx == num_children - 1)759 in_gpr = false;760 else {761 uint64_t next_field_bit_offset = 0;762 CompilerType next_field_compiler_type =763 return_compiler_type.GetFieldAtIndex(idx + 1, name,764 &next_field_bit_offset,765 nullptr, nullptr);766 if (next_field_compiler_type.IsIntegerOrEnumerationType(767 is_signed))768 in_gpr = true;769 else {770 copy_from_offset = 0;771 in_gpr = false;772 }773 }774 } else if (field_byte_offset % 4 == 0) {775 // We are inside of an eightbyte, so see if the field before us776 // is floating point: This could happen if somebody put padding777 // in the structure.778 if (idx == 0)779 in_gpr = false;780 else {781 uint64_t prev_field_bit_offset = 0;782 CompilerType prev_field_compiler_type =783 return_compiler_type.GetFieldAtIndex(idx - 1, name,784 &prev_field_bit_offset,785 nullptr, nullptr);786 if (prev_field_compiler_type.IsIntegerOrEnumerationType(787 is_signed))788 in_gpr = true;789 else {790 copy_from_offset = 4;791 in_gpr = false;792 }793 }794 } else {795 is_memory = true;796 continue;797 }798 799 // Okay, we've figured out whether we are in GPR or XMM, now figure800 // out which one.801 if (in_gpr) {802 if (integer_bytes < 8) {803 // This is in RAX, copy from register to our result structure:804 copy_from_extractor = &r3_data;805 copy_from_offset = integer_bytes;806 integer_bytes += field_byte_width;807 } else {808 copy_from_extractor = &rdx_data;809 copy_from_offset = integer_bytes - 8;810 integer_bytes += field_byte_width;811 }812 }813 }814 }815 816 // These two tests are just sanity checks. If I somehow get the type817 // calculation wrong above it is better to just return nothing than to818 // assert or crash.819 if (!copy_from_extractor)820 return return_valobj_sp;821 if (copy_from_offset + field_byte_width >822 copy_from_extractor->GetByteSize())823 return return_valobj_sp;824 825 copy_from_extractor->CopyByteOrderedData(826 copy_from_offset, field_byte_width,827 data_sp->GetBytes() + field_byte_offset, field_byte_width,828 target_byte_order);829 }830 831 if (!is_memory) {832 // The result is in our data buffer. Let's make a variable object out833 // of it:834 return_valobj_sp = ValueObjectConstResult::Create(835 &thread, return_compiler_type, ConstString(""), return_ext);836 }837 }838 839 // FIXME: This is just taking a guess, r3 may very well no longer hold the840 // return storage location.841 // If we are going to do this right, when we make a new frame we should842 // check to see if it uses a memory return, and if we are at the first843 // instruction and if so stash away the return location. Then we would844 // only return the memory return value if we know it is valid.845 846 if (is_memory) {847 unsigned r3_id =848 reg_ctx_sp->GetRegisterInfoByName("r3", 0)->kinds[eRegisterKindLLDB];849 lldb::addr_t storage_addr =850 (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r3_id,851 0);852 return_valobj_sp = ValueObjectMemory::Create(853 &thread, "", Address(storage_addr, nullptr), return_compiler_type);854 }855 }856 857 return return_valobj_sp;858}859 860UnwindPlanSP ABISysV_ppc::CreateFunctionEntryUnwindPlan() {861 uint32_t lr_reg_num = dwarf_lr;862 uint32_t sp_reg_num = dwarf_r1;863 uint32_t pc_reg_num = dwarf_pc;864 865 UnwindPlan::Row row;866 867 // Our Call Frame Address is the stack pointer value868 row.GetCFAValue().SetIsRegisterPlusOffset(sp_reg_num, 0);869 870 // The previous PC is in the LR, all other registers are the same.871 row.SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true);872 873 auto plan_sp = std::make_shared<UnwindPlan>(eRegisterKindDWARF);874 plan_sp->AppendRow(std::move(row));875 plan_sp->SetSourceName("ppc at-func-entry default");876 plan_sp->SetSourcedFromCompiler(eLazyBoolNo);877 return plan_sp;878}879 880UnwindPlanSP ABISysV_ppc::CreateDefaultUnwindPlan() {881 882 uint32_t sp_reg_num = dwarf_r1;883 uint32_t pc_reg_num = dwarf_lr;884 885 UnwindPlan::Row row;886 887 const int32_t ptr_size = 4;888 row.SetUnspecifiedRegistersAreUndefined(true);889 row.GetCFAValue().SetIsRegisterDereferenced(sp_reg_num);890 891 row.SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 1, true);892 row.SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true);893 894 auto plan_sp = std::make_shared<UnwindPlan>(eRegisterKindDWARF);895 plan_sp->AppendRow(std::move(row));896 plan_sp->SetSourceName("ppc default unwind plan");897 plan_sp->SetSourcedFromCompiler(eLazyBoolNo);898 plan_sp->SetUnwindPlanValidAtAllInstructions(eLazyBoolNo);899 plan_sp->SetUnwindPlanForSignalTrap(eLazyBoolNo);900 plan_sp->SetReturnAddressRegister(dwarf_lr);901 return plan_sp;902}903 904bool ABISysV_ppc::RegisterIsVolatile(const RegisterInfo *reg_info) {905 return !RegisterIsCalleeSaved(reg_info);906}907 908// See "Register Usage" in the909// "System V Application Binary Interface"910// "64-bit PowerPC ELF Application Binary Interface Supplement" current version911// is 1.9 released 2004 at http://refspecs.linuxfoundation.org/ELF/ppc/PPC-912// elf64abi-1.9.pdf913 914bool ABISysV_ppc::RegisterIsCalleeSaved(const RegisterInfo *reg_info) {915 if (reg_info) {916 // Preserved registers are :917 // r1,r2,r13-r31918 // f14-f31 (not yet)919 // v20-v31 (not yet)920 // vrsave (not yet)921 922 const char *name = reg_info->name;923 if (name[0] == 'r') {924 if ((name[1] == '1' || name[1] == '2') && name[2] == '\0')925 return true;926 if (name[1] == '1' && name[2] > '2')927 return true;928 if ((name[1] == '2' || name[1] == '3') && name[2] != '\0')929 return true;930 }931 932 if (name[0] == 'f' && name[1] >= '0' && name[1] <= '9') {933 if (name[3] == '1' && name[4] >= '4')934 return true;935 if ((name[3] == '2' || name[3] == '3') && name[4] != '\0')936 return true;937 }938 939 if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp940 return true;941 if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp942 return true;943 if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0') // pc944 return true;945 }946 return false;947}948 949void ABISysV_ppc::Initialize() {950 PluginManager::RegisterPlugin(GetPluginNameStatic(),951 "System V ABI for ppc targets", CreateInstance);952}953 954void ABISysV_ppc::Terminate() {955 PluginManager::UnregisterPlugin(CreateInstance);956}957