| //===-- ABISysV_ppc64.cpp ---------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ABISysV_ppc64.h" |
| |
| // C Includes |
| // C++ Includes |
| // Other libraries and framework includes |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/Triple.h" |
| |
| // Project includes |
| #include "Utility/PPC64LE_DWARF_Registers.h" |
| #include "Utility/PPC64_DWARF_Registers.h" |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/RegisterValue.h" |
| #include "lldb/Core/Value.h" |
| #include "lldb/Core/ValueObjectConstResult.h" |
| #include "lldb/Core/ValueObjectMemory.h" |
| #include "lldb/Core/ValueObjectRegister.h" |
| #include "lldb/Symbol/ClangASTContext.h" |
| #include "lldb/Symbol/UnwindPlan.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Target/StackFrame.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Utility/ConstString.h" |
| #include "lldb/Utility/DataExtractor.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/Status.h" |
| |
| #include "clang/AST/ASTContext.h" |
| #include "clang/AST/Attr.h" |
| #include "clang/AST/Decl.h" |
| |
| #define DECLARE_REGISTER_INFOS_PPC64_STRUCT |
| #include "Plugins/Process/Utility/RegisterInfos_ppc64.h" |
| #undef DECLARE_REGISTER_INFOS_PPC64_STRUCT |
| |
| #define DECLARE_REGISTER_INFOS_PPC64LE_STRUCT |
| #include "Plugins/Process/Utility/RegisterInfos_ppc64le.h" |
| #undef DECLARE_REGISTER_INFOS_PPC64LE_STRUCT |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| const lldb_private::RegisterInfo * |
| ABISysV_ppc64::GetRegisterInfoArray(uint32_t &count) { |
| if (GetByteOrder() == lldb::eByteOrderLittle) { |
| count = llvm::array_lengthof(g_register_infos_ppc64le); |
| return g_register_infos_ppc64le; |
| } else { |
| count = llvm::array_lengthof(g_register_infos_ppc64); |
| return g_register_infos_ppc64; |
| } |
| } |
| |
| size_t ABISysV_ppc64::GetRedZoneSize() const { return 224; } |
| |
| lldb::ByteOrder ABISysV_ppc64::GetByteOrder() const { |
| return GetProcessSP()->GetByteOrder(); |
| } |
| |
| //------------------------------------------------------------------ |
| // Static Functions |
| //------------------------------------------------------------------ |
| |
| ABISP |
| ABISysV_ppc64::CreateInstance(lldb::ProcessSP process_sp, |
| const ArchSpec &arch) { |
| if (arch.GetTriple().getArch() == llvm::Triple::ppc64 || |
| arch.GetTriple().getArch() == llvm::Triple::ppc64le) { |
| return ABISP(new ABISysV_ppc64(process_sp)); |
| } |
| return ABISP(); |
| } |
| |
| bool ABISysV_ppc64::PrepareTrivialCall(Thread &thread, addr_t sp, |
| addr_t func_addr, addr_t return_addr, |
| llvm::ArrayRef<addr_t> args) const { |
| Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); |
| |
| if (log) { |
| StreamString s; |
| s.Printf("ABISysV_ppc64::PrepareTrivialCall (tid = 0x%" PRIx64 |
| ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64 |
| ", return_addr = 0x%" PRIx64, |
| thread.GetID(), (uint64_t)sp, (uint64_t)func_addr, |
| (uint64_t)return_addr); |
| |
| for (size_t i = 0; i < args.size(); ++i) |
| s.Printf(", arg%" PRIu64 " = 0x%" PRIx64, static_cast<uint64_t>(i + 1), |
| args[i]); |
| s.PutCString(")"); |
| log->PutString(s.GetString()); |
| } |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return false; |
| |
| const RegisterInfo *reg_info = nullptr; |
| |
| if (args.size() > 8) // TODO handle more than 8 arguments |
| return false; |
| |
| for (size_t i = 0; i < args.size(); ++i) { |
| reg_info = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, |
| LLDB_REGNUM_GENERIC_ARG1 + i); |
| if (log) |
| log->Printf("About to write arg%" PRIu64 " (0x%" PRIx64 ") into %s", |
| static_cast<uint64_t>(i + 1), args[i], reg_info->name); |
| if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i])) |
| return false; |
| } |
| |
| // First, align the SP |
| |
| if (log) |
| log->Printf("16-byte aligning SP: 0x%" PRIx64 " to 0x%" PRIx64, |
| (uint64_t)sp, (uint64_t)(sp & ~0xfull)); |
| |
| sp &= ~(0xfull); // 16-byte alignment |
| |
| sp -= 544; // allocate frame to save TOC, RA and SP. |
| |
| Status error; |
| uint64_t reg_value; |
| const RegisterInfo *pc_reg_info = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC); |
| const RegisterInfo *sp_reg_info = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); |
| ProcessSP process_sp(thread.GetProcess()); |
| const RegisterInfo *lr_reg_info = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA); |
| const RegisterInfo *r2_reg_info = reg_ctx->GetRegisterInfoAtIndex(2); |
| const RegisterInfo *r12_reg_info = reg_ctx->GetRegisterInfoAtIndex(12); |
| |
| // Save return address onto the stack. |
| if (log) |
| log->Printf("Pushing the return address onto the stack: 0x%" PRIx64 |
| "(+16): 0x%" PRIx64, |
| (uint64_t)sp, (uint64_t)return_addr); |
| if (!process_sp->WritePointerToMemory(sp + 16, return_addr, error)) |
| return false; |
| |
| // Write the return address to link register. |
| if (log) |
| log->Printf("Writing LR: 0x%" PRIx64, (uint64_t)return_addr); |
| if (!reg_ctx->WriteRegisterFromUnsigned(lr_reg_info, return_addr)) |
| return false; |
| |
| // Write target address to %r12 register. |
| if (log) |
| log->Printf("Writing R12: 0x%" PRIx64, (uint64_t)func_addr); |
| if (!reg_ctx->WriteRegisterFromUnsigned(r12_reg_info, func_addr)) |
| return false; |
| |
| // Read TOC pointer value. |
| reg_value = reg_ctx->ReadRegisterAsUnsigned(r2_reg_info, 0); |
| |
| // Write TOC pointer onto the stack. |
| uint64_t stack_offset; |
| if (GetByteOrder() == lldb::eByteOrderLittle) |
| stack_offset = 24; |
| else |
| stack_offset = 40; |
| |
| if (log) |
| log->Printf("Writing R2 (TOC) at SP(0x%" PRIx64 ")+%d: 0x%" PRIx64, |
| (uint64_t)(sp + stack_offset), (int)stack_offset, |
| (uint64_t)reg_value); |
| if (!process_sp->WritePointerToMemory(sp + stack_offset, reg_value, error)) |
| return false; |
| |
| // Read the current SP value. |
| reg_value = reg_ctx->ReadRegisterAsUnsigned(sp_reg_info, 0); |
| |
| // Save current SP onto the stack. |
| if (log) |
| log->Printf("Writing SP at SP(0x%" PRIx64 ")+0: 0x%" PRIx64, (uint64_t)sp, |
| (uint64_t)reg_value); |
| if (!process_sp->WritePointerToMemory(sp, reg_value, error)) |
| return false; |
| |
| // %r1 is set to the actual stack value. |
| if (log) |
| log->Printf("Writing SP: 0x%" PRIx64, (uint64_t)sp); |
| |
| if (!reg_ctx->WriteRegisterFromUnsigned(sp_reg_info, sp)) |
| return false; |
| |
| // %pc is set to the address of the called function. |
| |
| if (log) |
| log->Printf("Writing IP: 0x%" PRIx64, (uint64_t)func_addr); |
| |
| if (!reg_ctx->WriteRegisterFromUnsigned(pc_reg_info, func_addr)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool ReadIntegerArgument(Scalar &scalar, unsigned int bit_width, |
| bool is_signed, Thread &thread, |
| uint32_t *argument_register_ids, |
| unsigned int ¤t_argument_register, |
| addr_t ¤t_stack_argument) { |
| if (bit_width > 64) |
| return false; // Scalar can't hold large integer arguments |
| |
| if (current_argument_register < 6) { |
| scalar = thread.GetRegisterContext()->ReadRegisterAsUnsigned( |
| argument_register_ids[current_argument_register], 0); |
| current_argument_register++; |
| if (is_signed) |
| scalar.SignExtend(bit_width); |
| } else { |
| uint32_t byte_size = (bit_width + (8 - 1)) / 8; |
| Status error; |
| if (thread.GetProcess()->ReadScalarIntegerFromMemory( |
| current_stack_argument, byte_size, is_signed, scalar, error)) { |
| current_stack_argument += byte_size; |
| return true; |
| } |
| return false; |
| } |
| return true; |
| } |
| |
| bool ABISysV_ppc64::GetArgumentValues(Thread &thread, ValueList &values) const { |
| unsigned int num_values = values.GetSize(); |
| unsigned int value_index; |
| |
| // Extract the register context so we can read arguments from registers |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| |
| if (!reg_ctx) |
| return false; |
| |
| // Get the pointer to the first stack argument so we have a place to start |
| // when reading data |
| |
| addr_t sp = reg_ctx->GetSP(0); |
| |
| if (!sp) |
| return false; |
| |
| uint64_t stack_offset; |
| if (GetByteOrder() == lldb::eByteOrderLittle) |
| stack_offset = 32; |
| else |
| stack_offset = 48; |
| |
| // jump over return address. |
| addr_t current_stack_argument = sp + stack_offset; |
| uint32_t argument_register_ids[8]; |
| |
| for (size_t i = 0; i < 8; ++i) { |
| argument_register_ids[i] = |
| reg_ctx |
| ->GetRegisterInfo(eRegisterKindGeneric, |
| LLDB_REGNUM_GENERIC_ARG1 + i) |
| ->kinds[eRegisterKindLLDB]; |
| } |
| |
| unsigned int current_argument_register = 0; |
| |
| for (value_index = 0; value_index < num_values; ++value_index) { |
| Value *value = values.GetValueAtIndex(value_index); |
| |
| if (!value) |
| return false; |
| |
| // We currently only support extracting values with Clang QualTypes. Do we |
| // care about others? |
| CompilerType compiler_type = value->GetCompilerType(); |
| if (!compiler_type) |
| return false; |
| bool is_signed; |
| |
| if (compiler_type.IsIntegerOrEnumerationType(is_signed)) { |
| ReadIntegerArgument(value->GetScalar(), compiler_type.GetBitSize(&thread), |
| is_signed, thread, argument_register_ids, |
| current_argument_register, current_stack_argument); |
| } else if (compiler_type.IsPointerType()) { |
| ReadIntegerArgument(value->GetScalar(), compiler_type.GetBitSize(&thread), |
| false, thread, argument_register_ids, |
| current_argument_register, current_stack_argument); |
| } |
| } |
| |
| return true; |
| } |
| |
| Status ABISysV_ppc64::SetReturnValueObject(lldb::StackFrameSP &frame_sp, |
| lldb::ValueObjectSP &new_value_sp) { |
| Status error; |
| if (!new_value_sp) { |
| error.SetErrorString("Empty value object for return value."); |
| return error; |
| } |
| |
| CompilerType compiler_type = new_value_sp->GetCompilerType(); |
| if (!compiler_type) { |
| error.SetErrorString("Null clang type for return value."); |
| return error; |
| } |
| |
| Thread *thread = frame_sp->GetThread().get(); |
| |
| bool is_signed; |
| uint32_t count; |
| bool is_complex; |
| |
| RegisterContext *reg_ctx = thread->GetRegisterContext().get(); |
| |
| bool set_it_simple = false; |
| if (compiler_type.IsIntegerOrEnumerationType(is_signed) || |
| compiler_type.IsPointerType()) { |
| const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName("r3", 0); |
| |
| DataExtractor data; |
| Status data_error; |
| size_t num_bytes = new_value_sp->GetData(data, data_error); |
| if (data_error.Fail()) { |
| error.SetErrorStringWithFormat( |
| "Couldn't convert return value to raw data: %s", |
| data_error.AsCString()); |
| return error; |
| } |
| lldb::offset_t offset = 0; |
| if (num_bytes <= 8) { |
| uint64_t raw_value = data.GetMaxU64(&offset, num_bytes); |
| |
| if (reg_ctx->WriteRegisterFromUnsigned(reg_info, raw_value)) |
| set_it_simple = true; |
| } else { |
| error.SetErrorString("We don't support returning longer than 64 bit " |
| "integer values at present."); |
| } |
| } else if (compiler_type.IsFloatingPointType(count, is_complex)) { |
| if (is_complex) |
| error.SetErrorString( |
| "We don't support returning complex values at present"); |
| else { |
| size_t bit_width = compiler_type.GetBitSize(frame_sp.get()); |
| if (bit_width <= 64) { |
| DataExtractor data; |
| Status data_error; |
| size_t num_bytes = new_value_sp->GetData(data, data_error); |
| if (data_error.Fail()) { |
| error.SetErrorStringWithFormat( |
| "Couldn't convert return value to raw data: %s", |
| data_error.AsCString()); |
| return error; |
| } |
| |
| unsigned char buffer[16]; |
| ByteOrder byte_order = data.GetByteOrder(); |
| |
| data.CopyByteOrderedData(0, num_bytes, buffer, 16, byte_order); |
| set_it_simple = true; |
| } else { |
| // FIXME - don't know how to do 80 bit long doubles yet. |
| error.SetErrorString( |
| "We don't support returning float values > 64 bits at present"); |
| } |
| } |
| } |
| |
| if (!set_it_simple) { |
| // Okay we've got a structure or something that doesn't fit in a simple |
| // register. We should figure out where it really goes, but we don't |
| // support this yet. |
| error.SetErrorString("We only support setting simple integer and float " |
| "return types at present."); |
| } |
| |
| return error; |
| } |
| |
| // |
| // ReturnValueExtractor |
| // |
| |
| namespace { |
| |
| #define LOG_PREFIX "ReturnValueExtractor: " |
| |
| class ReturnValueExtractor { |
| // This class represents a register, from which data may be extracted. |
| // |
| // It may be constructed by directly specifying its index (where 0 is the |
| // first register used to return values) or by specifying the offset of a |
| // given struct field, in which case the appropriated register index will be |
| // calculated. |
| class Register { |
| public: |
| enum Type { |
| GPR, // General Purpose Register |
| FPR // Floating Point Register |
| }; |
| |
| // main constructor |
| // |
| // offs - field offset in struct |
| Register(Type ty, uint32_t index, uint32_t offs, RegisterContext *reg_ctx, |
| ByteOrder byte_order) |
| : m_index(index), m_offs(offs % sizeof(uint64_t)), |
| m_avail(sizeof(uint64_t) - m_offs), m_type(ty), m_reg_ctx(reg_ctx), |
| m_byte_order(byte_order) {} |
| |
| // explicit index, no offset |
| Register(Type ty, uint32_t index, RegisterContext *reg_ctx, |
| ByteOrder byte_order) |
| : Register(ty, index, 0, reg_ctx, byte_order) {} |
| |
| // GPR, calculate index from offs |
| Register(uint32_t offs, RegisterContext *reg_ctx, ByteOrder byte_order) |
| : Register(GPR, offs / sizeof(uint64_t), offs, reg_ctx, byte_order) {} |
| |
| uint32_t Index() const { return m_index; } |
| |
| // register offset where data is located |
| uint32_t Offs() const { return m_offs; } |
| |
| // available bytes in this register |
| uint32_t Avail() const { return m_avail; } |
| |
| bool IsValid() const { |
| if (m_index > 7) { |
| LLDB_LOG(m_log, LOG_PREFIX |
| "No more than 8 registers should be used to return values"); |
| return false; |
| } |
| return true; |
| } |
| |
| std::string GetName() const { |
| if (m_type == GPR) |
| return ("r" + llvm::Twine(m_index + 3)).str(); |
| else |
| return ("f" + llvm::Twine(m_index + 1)).str(); |
| } |
| |
| // get raw register data |
| bool GetRawData(uint64_t &raw_data) { |
| const RegisterInfo *reg_info = |
| m_reg_ctx->GetRegisterInfoByName(GetName()); |
| if (!reg_info) { |
| LLDB_LOG(m_log, LOG_PREFIX "Failed to get RegisterInfo"); |
| return false; |
| } |
| |
| RegisterValue reg_val; |
| if (!m_reg_ctx->ReadRegister(reg_info, reg_val)) { |
| LLDB_LOG(m_log, LOG_PREFIX "ReadRegister() failed"); |
| return false; |
| } |
| |
| Status error; |
| uint32_t rc = reg_val.GetAsMemoryData( |
| reg_info, &raw_data, sizeof(raw_data), m_byte_order, error); |
| if (rc != sizeof(raw_data)) { |
| LLDB_LOG(m_log, LOG_PREFIX "GetAsMemoryData() failed"); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| private: |
| uint32_t m_index; |
| uint32_t m_offs; |
| uint32_t m_avail; |
| Type m_type; |
| RegisterContext *m_reg_ctx; |
| ByteOrder m_byte_order; |
| Log *m_log = |
| lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS); |
| }; |
| |
| Register GetGPR(uint32_t index) const { |
| return Register(Register::GPR, index, m_reg_ctx, m_byte_order); |
| } |
| |
| Register GetFPR(uint32_t index) const { |
| return Register(Register::FPR, index, m_reg_ctx, m_byte_order); |
| } |
| |
| Register GetGPRByOffs(uint32_t offs) const { |
| return Register(offs, m_reg_ctx, m_byte_order); |
| } |
| |
| public: |
| // factory |
| static llvm::Expected<ReturnValueExtractor> Create(Thread &thread, |
| CompilerType &type) { |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return llvm::make_error<llvm::StringError>( |
| LOG_PREFIX "Failed to get RegisterContext", |
| llvm::inconvertibleErrorCode()); |
| |
| ProcessSP process_sp = thread.GetProcess(); |
| if (!process_sp) |
| return llvm::make_error<llvm::StringError>( |
| LOG_PREFIX "GetProcess() failed", llvm::inconvertibleErrorCode()); |
| |
| return ReturnValueExtractor(thread, type, reg_ctx, process_sp); |
| } |
| |
| // main method: get value of the type specified at construction time |
| ValueObjectSP GetValue() { |
| const uint32_t type_flags = m_type.GetTypeInfo(); |
| |
| // call the appropriate type handler |
| ValueSP value_sp; |
| ValueObjectSP valobj_sp; |
| if (type_flags & eTypeIsScalar) { |
| if (type_flags & eTypeIsInteger) { |
| value_sp = GetIntegerValue(0); |
| } else if (type_flags & eTypeIsFloat) { |
| if (type_flags & eTypeIsComplex) { |
| LLDB_LOG(m_log, LOG_PREFIX "Complex numbers are not supported yet"); |
| return ValueObjectSP(); |
| } else { |
| value_sp = GetFloatValue(m_type, 0); |
| } |
| } |
| } else if (type_flags & eTypeIsPointer) { |
| value_sp = GetPointerValue(0); |
| } |
| |
| if (value_sp) { |
| valobj_sp = ValueObjectConstResult::Create( |
| m_thread.GetStackFrameAtIndex(0).get(), *value_sp, ConstString("")); |
| } else if (type_flags & eTypeIsVector) { |
| valobj_sp = GetVectorValueObject(); |
| } else if (type_flags & eTypeIsStructUnion || type_flags & eTypeIsClass) { |
| valobj_sp = GetStructValueObject(); |
| } |
| |
| return valobj_sp; |
| } |
| |
| private: |
| // data |
| Thread &m_thread; |
| CompilerType &m_type; |
| uint64_t m_byte_size; |
| std::unique_ptr<DataBufferHeap> m_data_ap; |
| int32_t m_src_offs = 0; |
| int32_t m_dst_offs = 0; |
| bool m_packed = false; |
| Log *m_log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS); |
| RegisterContext *m_reg_ctx; |
| ProcessSP m_process_sp; |
| ByteOrder m_byte_order; |
| uint32_t m_addr_size; |
| |
| // methods |
| |
| // constructor |
| ReturnValueExtractor(Thread &thread, CompilerType &type, |
| RegisterContext *reg_ctx, ProcessSP process_sp) |
| : m_thread(thread), m_type(type), |
| m_byte_size(m_type.GetByteSize(nullptr)), |
| m_data_ap(new DataBufferHeap(m_byte_size, 0)), m_reg_ctx(reg_ctx), |
| m_process_sp(process_sp), m_byte_order(process_sp->GetByteOrder()), |
| m_addr_size( |
| process_sp->GetTarget().GetArchitecture().GetAddressByteSize()) {} |
| |
| // build a new scalar value |
| ValueSP NewScalarValue(CompilerType &type) { |
| ValueSP value_sp(new Value); |
| value_sp->SetCompilerType(type); |
| value_sp->SetValueType(Value::eValueTypeScalar); |
| return value_sp; |
| } |
| |
| // get an integer value in the specified register |
| ValueSP GetIntegerValue(uint32_t reg_index) { |
| uint64_t raw_value; |
| auto reg = GetGPR(reg_index); |
| if (!reg.GetRawData(raw_value)) |
| return ValueSP(); |
| |
| // build value from data |
| ValueSP value_sp(NewScalarValue(m_type)); |
| |
| uint32_t type_flags = m_type.GetTypeInfo(); |
| bool is_signed = (type_flags & eTypeIsSigned) != 0; |
| |
| switch (m_byte_size) { |
| case sizeof(uint64_t): |
| if (is_signed) |
| value_sp->GetScalar() = (int64_t)(raw_value); |
| else |
| value_sp->GetScalar() = (uint64_t)(raw_value); |
| break; |
| |
| case sizeof(uint32_t): |
| if (is_signed) |
| value_sp->GetScalar() = (int32_t)(raw_value & UINT32_MAX); |
| else |
| value_sp->GetScalar() = (uint32_t)(raw_value & UINT32_MAX); |
| break; |
| |
| case sizeof(uint16_t): |
| if (is_signed) |
| value_sp->GetScalar() = (int16_t)(raw_value & UINT16_MAX); |
| else |
| value_sp->GetScalar() = (uint16_t)(raw_value & UINT16_MAX); |
| break; |
| |
| case sizeof(uint8_t): |
| if (is_signed) |
| value_sp->GetScalar() = (int8_t)(raw_value & UINT8_MAX); |
| else |
| value_sp->GetScalar() = (uint8_t)(raw_value & UINT8_MAX); |
| break; |
| |
| default: |
| llvm_unreachable("Invalid integer size"); |
| } |
| |
| return value_sp; |
| } |
| |
| // get a floating point value on the specified register |
| ValueSP GetFloatValue(CompilerType &type, uint32_t reg_index) { |
| uint64_t raw_data; |
| auto reg = GetFPR(reg_index); |
| if (!reg.GetRawData(raw_data)) |
| return ValueSP(); |
| |
| // build value from data |
| ValueSP value_sp(NewScalarValue(type)); |
| |
| DataExtractor de(&raw_data, sizeof(raw_data), m_byte_order, m_addr_size); |
| |
| offset_t offset = 0; |
| size_t byte_size = type.GetByteSize(nullptr); |
| switch (byte_size) { |
| case sizeof(float): |
| value_sp->GetScalar() = (float)de.GetDouble(&offset); |
| break; |
| |
| case sizeof(double): |
| value_sp->GetScalar() = de.GetDouble(&offset); |
| break; |
| |
| default: |
| llvm_unreachable("Invalid floating point size"); |
| } |
| |
| return value_sp; |
| } |
| |
| // get pointer value from register |
| ValueSP GetPointerValue(uint32_t reg_index) { |
| uint64_t raw_data; |
| auto reg = GetGPR(reg_index); |
| if (!reg.GetRawData(raw_data)) |
| return ValueSP(); |
| |
| // build value from raw data |
| ValueSP value_sp(NewScalarValue(m_type)); |
| value_sp->GetScalar() = raw_data; |
| return value_sp; |
| } |
| |
| // build the ValueObject from our data buffer |
| ValueObjectSP BuildValueObject() { |
| DataExtractor de(DataBufferSP(m_data_ap.release()), m_byte_order, |
| m_addr_size); |
| return ValueObjectConstResult::Create(&m_thread, m_type, ConstString(""), |
| de); |
| } |
| |
| // get a vector return value |
| ValueObjectSP GetVectorValueObject() { |
| const uint32_t MAX_VRS = 2; |
| |
| // get first V register used to return values |
| const RegisterInfo *vr[MAX_VRS]; |
| vr[0] = m_reg_ctx->GetRegisterInfoByName("vr2"); |
| if (!vr[0]) { |
| LLDB_LOG(m_log, LOG_PREFIX "Failed to get vr2 RegisterInfo"); |
| return ValueObjectSP(); |
| } |
| |
| const uint32_t vr_size = vr[0]->byte_size; |
| size_t vrs = 1; |
| if (m_byte_size > 2 * vr_size) { |
| LLDB_LOG( |
| m_log, LOG_PREFIX |
| "Returning vectors that don't fit in 2 VR regs is not supported"); |
| return ValueObjectSP(); |
| } |
| |
| // load vr3, if needed |
| if (m_byte_size > vr_size) { |
| vrs++; |
| vr[1] = m_reg_ctx->GetRegisterInfoByName("vr3"); |
| if (!vr[1]) { |
| LLDB_LOG(m_log, LOG_PREFIX "Failed to get vr3 RegisterInfo"); |
| return ValueObjectSP(); |
| } |
| } |
| |
| // Get the whole contents of vector registers and let the logic here |
| // arrange the data properly. |
| |
| RegisterValue vr_val[MAX_VRS]; |
| Status error; |
| std::unique_ptr<DataBufferHeap> vr_data( |
| new DataBufferHeap(vrs * vr_size, 0)); |
| |
| for (uint32_t i = 0; i < vrs; i++) { |
| if (!m_reg_ctx->ReadRegister(vr[i], vr_val[i])) { |
| LLDB_LOG(m_log, LOG_PREFIX "Failed to read vector register contents"); |
| return ValueObjectSP(); |
| } |
| if (!vr_val[i].GetAsMemoryData(vr[i], vr_data->GetBytes() + i * vr_size, |
| vr_size, m_byte_order, error)) { |
| LLDB_LOG(m_log, LOG_PREFIX "Failed to extract vector register bytes"); |
| return ValueObjectSP(); |
| } |
| } |
| |
| // The compiler generated code seems to always put the vector elements at |
| // the end of the vector register, in case they don't occupy all of it. |
| // This offset variable handles this. |
| uint32_t offs = 0; |
| if (m_byte_size < vr_size) |
| offs = vr_size - m_byte_size; |
| |
| // copy extracted data to our buffer |
| memcpy(m_data_ap->GetBytes(), vr_data->GetBytes() + offs, m_byte_size); |
| return BuildValueObject(); |
| } |
| |
| // get a struct return value |
| ValueObjectSP GetStructValueObject() { |
| // case 1: get from stack |
| if (m_byte_size > 2 * sizeof(uint64_t)) { |
| uint64_t addr; |
| auto reg = GetGPR(0); |
| if (!reg.GetRawData(addr)) |
| return ValueObjectSP(); |
| |
| Status error; |
| size_t rc = m_process_sp->ReadMemory(addr, m_data_ap->GetBytes(), |
| m_byte_size, error); |
| if (rc != m_byte_size) { |
| LLDB_LOG(m_log, LOG_PREFIX "Failed to read memory pointed by r3"); |
| return ValueObjectSP(); |
| } |
| return BuildValueObject(); |
| } |
| |
| // get number of children |
| const bool omit_empty_base_classes = true; |
| uint32_t n = m_type.GetNumChildren(omit_empty_base_classes); |
| if (!n) { |
| LLDB_LOG(m_log, LOG_PREFIX "No children found in struct"); |
| return ValueObjectSP(); |
| } |
| |
| // case 2: homogeneous double or float aggregate |
| CompilerType elem_type; |
| if (m_type.IsHomogeneousAggregate(&elem_type)) { |
| uint32_t type_flags = elem_type.GetTypeInfo(); |
| uint64_t elem_size = elem_type.GetByteSize(nullptr); |
| if (type_flags & eTypeIsComplex || !(type_flags & eTypeIsFloat)) { |
| LLDB_LOG(m_log, |
| LOG_PREFIX "Unexpected type found in homogeneous aggregate"); |
| return ValueObjectSP(); |
| } |
| |
| for (uint32_t i = 0; i < n; i++) { |
| ValueSP val_sp = GetFloatValue(elem_type, i); |
| if (!val_sp) |
| return ValueObjectSP(); |
| |
| // copy to buffer |
| Status error; |
| size_t rc = val_sp->GetScalar().GetAsMemoryData( |
| m_data_ap->GetBytes() + m_dst_offs, elem_size, m_byte_order, error); |
| if (rc != elem_size) { |
| LLDB_LOG(m_log, LOG_PREFIX "Failed to get float data"); |
| return ValueObjectSP(); |
| } |
| m_dst_offs += elem_size; |
| } |
| return BuildValueObject(); |
| } |
| |
| // case 3: get from GPRs |
| |
| // first, check if this is a packed struct or not |
| ClangASTContext *ast = |
| llvm::dyn_cast<ClangASTContext>(m_type.GetTypeSystem()); |
| if (ast) { |
| clang::RecordDecl *record_decl = ClangASTContext::GetAsRecordDecl(m_type); |
| |
| if (record_decl) { |
| auto attrs = record_decl->attrs(); |
| for (const auto &attr : attrs) { |
| if (attr->getKind() == clang::attr::Packed) { |
| m_packed = true; |
| break; |
| } |
| } |
| } |
| } |
| |
| LLDB_LOG(m_log, LOG_PREFIX "{0} struct", |
| m_packed ? "packed" : "not packed"); |
| |
| for (uint32_t i = 0; i < n; i++) { |
| std::string name; |
| uint32_t size; |
| GetChildType(i, name, size); |
| // NOTE: the offset returned by GetChildCompilerTypeAtIndex() |
| // can't be used because it never considers alignment bytes |
| // between struct fields. |
| LLDB_LOG(m_log, LOG_PREFIX "field={0}, size={1}", name, size); |
| if (!ExtractField(size)) |
| return ValueObjectSP(); |
| } |
| |
| return BuildValueObject(); |
| } |
| |
| // extract 'size' bytes at 'offs' from GPRs |
| bool ExtractFromRegs(int32_t offs, uint32_t size, void *buf) { |
| while (size) { |
| auto reg = GetGPRByOffs(offs); |
| if (!reg.IsValid()) |
| return false; |
| |
| uint32_t n = std::min(reg.Avail(), size); |
| uint64_t raw_data; |
| |
| if (!reg.GetRawData(raw_data)) |
| return false; |
| |
| memcpy(buf, (char *)&raw_data + reg.Offs(), n); |
| offs += n; |
| size -= n; |
| buf = (char *)buf + n; |
| } |
| return true; |
| } |
| |
| // extract one field from GPRs and put it in our buffer |
| bool ExtractField(uint32_t size) { |
| auto reg = GetGPRByOffs(m_src_offs); |
| if (!reg.IsValid()) |
| return false; |
| |
| // handle padding |
| if (!m_packed) { |
| uint32_t n = m_src_offs % size; |
| |
| // not 'size' bytes aligned |
| if (n) { |
| LLDB_LOG(m_log, |
| LOG_PREFIX "Extracting {0} alignment bytes at offset {1}", n, |
| m_src_offs); |
| // get alignment bytes |
| if (!ExtractFromRegs(m_src_offs, n, m_data_ap->GetBytes() + m_dst_offs)) |
| return false; |
| m_src_offs += n; |
| m_dst_offs += n; |
| } |
| } |
| |
| // get field |
| LLDB_LOG(m_log, LOG_PREFIX "Extracting {0} field bytes at offset {1}", size, |
| m_src_offs); |
| if (!ExtractFromRegs(m_src_offs, size, m_data_ap->GetBytes() + m_dst_offs)) |
| return false; |
| m_src_offs += size; |
| m_dst_offs += size; |
| return true; |
| } |
| |
| // get child |
| CompilerType GetChildType(uint32_t i, std::string &name, uint32_t &size) { |
| // GetChild constant inputs |
| const bool transparent_pointers = false; |
| const bool omit_empty_base_classes = true; |
| const bool ignore_array_bounds = false; |
| // GetChild output params |
| int32_t child_offs; |
| uint32_t child_bitfield_bit_size; |
| uint32_t child_bitfield_bit_offset; |
| bool child_is_base_class; |
| bool child_is_deref_of_parent; |
| ValueObject *valobj = nullptr; |
| uint64_t language_flags; |
| ExecutionContext exe_ctx; |
| m_thread.CalculateExecutionContext(exe_ctx); |
| |
| return m_type.GetChildCompilerTypeAtIndex( |
| &exe_ctx, i, transparent_pointers, omit_empty_base_classes, |
| ignore_array_bounds, name, size, child_offs, child_bitfield_bit_size, |
| child_bitfield_bit_offset, child_is_base_class, |
| child_is_deref_of_parent, valobj, language_flags); |
| } |
| }; |
| |
| #undef LOG_PREFIX |
| |
| } // anonymous namespace |
| |
| ValueObjectSP |
| ABISysV_ppc64::GetReturnValueObjectSimple(Thread &thread, |
| CompilerType &type) const { |
| if (!type) |
| return ValueObjectSP(); |
| |
| auto exp_extractor = ReturnValueExtractor::Create(thread, type); |
| if (!exp_extractor) { |
| Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS); |
| LLDB_LOG_ERROR(log, exp_extractor.takeError(), |
| "Extracting return value failed: {0}"); |
| return ValueObjectSP(); |
| } |
| |
| return exp_extractor.get().GetValue(); |
| } |
| |
| ValueObjectSP ABISysV_ppc64::GetReturnValueObjectImpl( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| return GetReturnValueObjectSimple(thread, return_compiler_type); |
| } |
| |
| bool ABISysV_ppc64::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) { |
| unwind_plan.Clear(); |
| unwind_plan.SetRegisterKind(eRegisterKindDWARF); |
| |
| uint32_t lr_reg_num; |
| uint32_t sp_reg_num; |
| uint32_t pc_reg_num; |
| |
| if (GetByteOrder() == lldb::eByteOrderLittle) { |
| lr_reg_num = ppc64le_dwarf::dwarf_lr_ppc64le; |
| sp_reg_num = ppc64le_dwarf::dwarf_r1_ppc64le; |
| pc_reg_num = ppc64le_dwarf::dwarf_pc_ppc64le; |
| } else { |
| lr_reg_num = ppc64_dwarf::dwarf_lr_ppc64; |
| sp_reg_num = ppc64_dwarf::dwarf_r1_ppc64; |
| pc_reg_num = ppc64_dwarf::dwarf_pc_ppc64; |
| } |
| |
| UnwindPlan::RowSP row(new UnwindPlan::Row); |
| |
| // Our Call Frame Address is the stack pointer value |
| row->GetCFAValue().SetIsRegisterPlusOffset(sp_reg_num, 0); |
| |
| // The previous PC is in the LR |
| row->SetRegisterLocationToRegister(pc_reg_num, lr_reg_num, true); |
| unwind_plan.AppendRow(row); |
| |
| // All other registers are the same. |
| |
| unwind_plan.SetSourceName("ppc64 at-func-entry default"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| |
| return true; |
| } |
| |
| bool ABISysV_ppc64::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) { |
| unwind_plan.Clear(); |
| unwind_plan.SetRegisterKind(eRegisterKindDWARF); |
| |
| uint32_t sp_reg_num; |
| uint32_t pc_reg_num; |
| uint32_t cr_reg_num; |
| |
| if (GetByteOrder() == lldb::eByteOrderLittle) { |
| sp_reg_num = ppc64le_dwarf::dwarf_r1_ppc64le; |
| pc_reg_num = ppc64le_dwarf::dwarf_lr_ppc64le; |
| cr_reg_num = ppc64le_dwarf::dwarf_cr_ppc64le; |
| } else { |
| sp_reg_num = ppc64_dwarf::dwarf_r1_ppc64; |
| pc_reg_num = ppc64_dwarf::dwarf_lr_ppc64; |
| cr_reg_num = ppc64_dwarf::dwarf_cr_ppc64; |
| } |
| |
| UnwindPlan::RowSP row(new UnwindPlan::Row); |
| const int32_t ptr_size = 8; |
| row->GetCFAValue().SetIsRegisterDereferenced(sp_reg_num); |
| |
| row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 2, true); |
| row->SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true); |
| row->SetRegisterLocationToAtCFAPlusOffset(cr_reg_num, ptr_size, true); |
| |
| unwind_plan.AppendRow(row); |
| unwind_plan.SetSourceName("ppc64 default unwind plan"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo); |
| unwind_plan.SetReturnAddressRegister(pc_reg_num); |
| return true; |
| } |
| |
| bool ABISysV_ppc64::RegisterIsVolatile(const RegisterInfo *reg_info) { |
| return !RegisterIsCalleeSaved(reg_info); |
| } |
| |
| // See "Register Usage" in the |
| // "System V Application Binary Interface" |
| // "64-bit PowerPC ELF Application Binary Interface Supplement" current version |
| // is 2 released 2015 at |
| // https://members.openpowerfoundation.org/document/dl/576 |
| bool ABISysV_ppc64::RegisterIsCalleeSaved(const RegisterInfo *reg_info) { |
| if (reg_info) { |
| // Preserved registers are : |
| // r1,r2,r13-r31 |
| // cr2-cr4 (partially preserved) |
| // f14-f31 (not yet) |
| // v20-v31 (not yet) |
| // vrsave (not yet) |
| |
| const char *name = reg_info->name; |
| if (name[0] == 'r') { |
| if ((name[1] == '1' || name[1] == '2') && name[2] == '\0') |
| return true; |
| if (name[1] == '1' && name[2] > '2') |
| return true; |
| if ((name[1] == '2' || name[1] == '3') && name[2] != '\0') |
| return true; |
| } |
| |
| if (name[0] == 'f' && name[1] >= '0' && name[2] <= '9') { |
| if (name[2] == '\0') |
| return false; |
| if (name[1] == '1' && name[2] >= '4') |
| return true; |
| if ((name[1] == '2' || name[1] == '3') && name[2] != '\0') |
| return true; |
| } |
| |
| if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp |
| return true; |
| if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp |
| return false; |
| if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0') // pc |
| return true; |
| } |
| return false; |
| } |
| |
| void ABISysV_ppc64::Initialize() { |
| PluginManager::RegisterPlugin( |
| GetPluginNameStatic(), "System V ABI for ppc64 targets", CreateInstance); |
| } |
| |
| void ABISysV_ppc64::Terminate() { |
| PluginManager::UnregisterPlugin(CreateInstance); |
| } |
| |
| lldb_private::ConstString ABISysV_ppc64::GetPluginNameStatic() { |
| static ConstString g_name("sysv-ppc64"); |
| return g_name; |
| } |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol |
| //------------------------------------------------------------------ |
| |
| lldb_private::ConstString ABISysV_ppc64::GetPluginName() { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t ABISysV_ppc64::GetPluginVersion() { return 1; } |