| //===-- ABISysV_ppc.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_ppc.h" |
| |
| // C Includes |
| // C++ Includes |
| // Other libraries and framework includes |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/Triple.h" |
| |
| // Project includes |
| #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/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" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| enum dwarf_regnums { |
| dwarf_r0 = 0, |
| dwarf_r1, |
| dwarf_r2, |
| dwarf_r3, |
| dwarf_r4, |
| dwarf_r5, |
| dwarf_r6, |
| dwarf_r7, |
| dwarf_r8, |
| dwarf_r9, |
| dwarf_r10, |
| dwarf_r11, |
| dwarf_r12, |
| dwarf_r13, |
| dwarf_r14, |
| dwarf_r15, |
| dwarf_r16, |
| dwarf_r17, |
| dwarf_r18, |
| dwarf_r19, |
| dwarf_r20, |
| dwarf_r21, |
| dwarf_r22, |
| dwarf_r23, |
| dwarf_r24, |
| dwarf_r25, |
| dwarf_r26, |
| dwarf_r27, |
| dwarf_r28, |
| dwarf_r29, |
| dwarf_r30, |
| dwarf_r31, |
| dwarf_f0, |
| dwarf_f1, |
| dwarf_f2, |
| dwarf_f3, |
| dwarf_f4, |
| dwarf_f5, |
| dwarf_f6, |
| dwarf_f7, |
| dwarf_f8, |
| dwarf_f9, |
| dwarf_f10, |
| dwarf_f11, |
| dwarf_f12, |
| dwarf_f13, |
| dwarf_f14, |
| dwarf_f15, |
| dwarf_f16, |
| dwarf_f17, |
| dwarf_f18, |
| dwarf_f19, |
| dwarf_f20, |
| dwarf_f21, |
| dwarf_f22, |
| dwarf_f23, |
| dwarf_f24, |
| dwarf_f25, |
| dwarf_f26, |
| dwarf_f27, |
| dwarf_f28, |
| dwarf_f29, |
| dwarf_f30, |
| dwarf_f31, |
| dwarf_cr, |
| dwarf_fpscr, |
| dwarf_xer = 101, |
| dwarf_lr = 108, |
| dwarf_ctr, |
| dwarf_pc, |
| dwarf_cfa, |
| }; |
| |
| // Note that the size and offset will be updated by platform-specific classes. |
| #define DEFINE_GPR(reg, alt, kind1, kind2, kind3, kind4) \ |
| { \ |
| #reg, alt, 8, 0, eEncodingUint, eFormatHex, {kind1, kind2, kind3, kind4 }, \ |
| nullptr, nullptr, nullptr, 0 \ |
| } |
| |
| static const RegisterInfo g_register_infos[] = { |
| // General purpose registers. eh_frame, DWARF, |
| // Generic, Process Plugin |
| DEFINE_GPR(r0, nullptr, dwarf_r0, dwarf_r0, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r1, "sp", dwarf_r1, dwarf_r1, LLDB_REGNUM_GENERIC_SP, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r2, nullptr, dwarf_r2, dwarf_r2, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r3, "arg1", dwarf_r3, dwarf_r3, LLDB_REGNUM_GENERIC_ARG1, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r4, "arg2", dwarf_r4, dwarf_r4, LLDB_REGNUM_GENERIC_ARG2, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r5, "arg3", dwarf_r5, dwarf_r5, LLDB_REGNUM_GENERIC_ARG3, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r6, "arg4", dwarf_r6, dwarf_r6, LLDB_REGNUM_GENERIC_ARG4, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r7, "arg5", dwarf_r7, dwarf_r7, LLDB_REGNUM_GENERIC_ARG5, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r8, "arg6", dwarf_r8, dwarf_r8, LLDB_REGNUM_GENERIC_ARG6, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r9, "arg7", dwarf_r9, dwarf_r9, LLDB_REGNUM_GENERIC_ARG7, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r10, "arg8", dwarf_r10, dwarf_r10, LLDB_REGNUM_GENERIC_ARG8, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r11, nullptr, dwarf_r11, dwarf_r11, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r12, nullptr, dwarf_r12, dwarf_r12, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r13, nullptr, dwarf_r13, dwarf_r13, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r14, nullptr, dwarf_r14, dwarf_r14, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r15, nullptr, dwarf_r15, dwarf_r15, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r16, nullptr, dwarf_r16, dwarf_r16, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r17, nullptr, dwarf_r17, dwarf_r17, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r18, nullptr, dwarf_r18, dwarf_r18, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r19, nullptr, dwarf_r19, dwarf_r19, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r20, nullptr, dwarf_r20, dwarf_r20, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r21, nullptr, dwarf_r21, dwarf_r21, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r22, nullptr, dwarf_r22, dwarf_r22, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r23, nullptr, dwarf_r23, dwarf_r23, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r24, nullptr, dwarf_r24, dwarf_r24, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r25, nullptr, dwarf_r25, dwarf_r25, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r26, nullptr, dwarf_r26, dwarf_r26, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r27, nullptr, dwarf_r27, dwarf_r27, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r28, nullptr, dwarf_r28, dwarf_r28, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r29, nullptr, dwarf_r29, dwarf_r29, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r30, nullptr, dwarf_r30, dwarf_r30, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(r31, nullptr, dwarf_r31, dwarf_r31, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(lr, "lr", dwarf_lr, dwarf_lr, LLDB_REGNUM_GENERIC_RA, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(cr, "cr", dwarf_cr, dwarf_cr, LLDB_REGNUM_GENERIC_FLAGS, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(xer, "xer", dwarf_xer, dwarf_xer, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(ctr, "ctr", dwarf_ctr, dwarf_ctr, LLDB_INVALID_REGNUM, |
| LLDB_INVALID_REGNUM), |
| DEFINE_GPR(pc, "pc", dwarf_pc, dwarf_pc, LLDB_REGNUM_GENERIC_PC, |
| LLDB_INVALID_REGNUM), |
| {nullptr, |
| nullptr, |
| 8, |
| 0, |
| eEncodingUint, |
| eFormatHex, |
| {dwarf_cfa, dwarf_cfa, LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM}, |
| nullptr, |
| nullptr, |
| nullptr, |
| 0}}; |
| |
| static const uint32_t k_num_register_infos = |
| llvm::array_lengthof(g_register_infos); |
| |
| const lldb_private::RegisterInfo * |
| ABISysV_ppc::GetRegisterInfoArray(uint32_t &count) { |
| count = k_num_register_infos; |
| return g_register_infos; |
| } |
| |
| size_t ABISysV_ppc::GetRedZoneSize() const { return 224; } |
| |
| //------------------------------------------------------------------ |
| // Static Functions |
| //------------------------------------------------------------------ |
| |
| ABISP |
| ABISysV_ppc::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) { |
| static ABISP g_abi_sp; |
| if (arch.GetTriple().getArch() == llvm::Triple::ppc) { |
| if (!g_abi_sp) |
| g_abi_sp.reset(new ABISysV_ppc(process_sp)); |
| return g_abi_sp; |
| } |
| return ABISP(); |
| } |
| |
| bool ABISysV_ppc::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_ppc::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 -= 8; |
| |
| Status error; |
| 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()); |
| |
| RegisterValue reg_value; |
| |
| if (log) |
| log->Printf("Pushing the return address onto the stack: 0x%" PRIx64 |
| ": 0x%" PRIx64, |
| (uint64_t)sp, (uint64_t)return_addr); |
| |
| // Save return address onto the stack |
| if (!process_sp->WritePointerToMemory(sp, return_addr, 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_ppc::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; |
| |
| addr_t current_stack_argument = sp + 48; // jump over return address |
| |
| uint32_t argument_register_ids[8]; |
| |
| argument_register_ids[0] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[1] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[2] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG3) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[3] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG4) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[4] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG5) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[5] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG6) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[6] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG7) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[7] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG8) |
| ->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_ppc::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; |
| } |
| |
| ValueObjectSP ABISysV_ppc::GetReturnValueObjectSimple( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| Value value; |
| |
| if (!return_compiler_type) |
| return return_valobj_sp; |
| |
| // value.SetContext (Value::eContextTypeClangType, return_value_type); |
| value.SetCompilerType(return_compiler_type); |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return return_valobj_sp; |
| |
| const uint32_t type_flags = return_compiler_type.GetTypeInfo(); |
| if (type_flags & eTypeIsScalar) { |
| value.SetValueType(Value::eValueTypeScalar); |
| |
| bool success = false; |
| if (type_flags & eTypeIsInteger) { |
| // Extract the register context so we can read arguments from registers |
| |
| const size_t byte_size = return_compiler_type.GetByteSize(nullptr); |
| uint64_t raw_value = thread.GetRegisterContext()->ReadRegisterAsUnsigned( |
| reg_ctx->GetRegisterInfoByName("r3", 0), 0); |
| const bool is_signed = (type_flags & eTypeIsSigned) != 0; |
| switch (byte_size) { |
| default: |
| break; |
| |
| case sizeof(uint64_t): |
| if (is_signed) |
| value.GetScalar() = (int64_t)(raw_value); |
| else |
| value.GetScalar() = (uint64_t)(raw_value); |
| success = true; |
| break; |
| |
| case sizeof(uint32_t): |
| if (is_signed) |
| value.GetScalar() = (int32_t)(raw_value & UINT32_MAX); |
| else |
| value.GetScalar() = (uint32_t)(raw_value & UINT32_MAX); |
| success = true; |
| break; |
| |
| case sizeof(uint16_t): |
| if (is_signed) |
| value.GetScalar() = (int16_t)(raw_value & UINT16_MAX); |
| else |
| value.GetScalar() = (uint16_t)(raw_value & UINT16_MAX); |
| success = true; |
| break; |
| |
| case sizeof(uint8_t): |
| if (is_signed) |
| value.GetScalar() = (int8_t)(raw_value & UINT8_MAX); |
| else |
| value.GetScalar() = (uint8_t)(raw_value & UINT8_MAX); |
| success = true; |
| break; |
| } |
| } else if (type_flags & eTypeIsFloat) { |
| if (type_flags & eTypeIsComplex) { |
| // Don't handle complex yet. |
| } else { |
| const size_t byte_size = return_compiler_type.GetByteSize(nullptr); |
| if (byte_size <= sizeof(long double)) { |
| const RegisterInfo *f1_info = reg_ctx->GetRegisterInfoByName("f1", 0); |
| RegisterValue f1_value; |
| if (reg_ctx->ReadRegister(f1_info, f1_value)) { |
| DataExtractor data; |
| if (f1_value.GetData(data)) { |
| lldb::offset_t offset = 0; |
| if (byte_size == sizeof(float)) { |
| value.GetScalar() = (float)data.GetFloat(&offset); |
| success = true; |
| } else if (byte_size == sizeof(double)) { |
| value.GetScalar() = (double)data.GetDouble(&offset); |
| success = true; |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| if (success) |
| return_valobj_sp = ValueObjectConstResult::Create( |
| thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); |
| } else if (type_flags & eTypeIsPointer) { |
| unsigned r3_id = |
| reg_ctx->GetRegisterInfoByName("r3", 0)->kinds[eRegisterKindLLDB]; |
| value.GetScalar() = |
| (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r3_id, 0); |
| value.SetValueType(Value::eValueTypeScalar); |
| return_valobj_sp = ValueObjectConstResult::Create( |
| thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); |
| } else if (type_flags & eTypeIsVector) { |
| const size_t byte_size = return_compiler_type.GetByteSize(nullptr); |
| if (byte_size > 0) { |
| const RegisterInfo *altivec_reg = reg_ctx->GetRegisterInfoByName("v2", 0); |
| if (altivec_reg) { |
| if (byte_size <= altivec_reg->byte_size) { |
| ProcessSP process_sp(thread.GetProcess()); |
| if (process_sp) { |
| std::unique_ptr<DataBufferHeap> heap_data_ap( |
| new DataBufferHeap(byte_size, 0)); |
| const ByteOrder byte_order = process_sp->GetByteOrder(); |
| RegisterValue reg_value; |
| if (reg_ctx->ReadRegister(altivec_reg, reg_value)) { |
| Status error; |
| if (reg_value.GetAsMemoryData( |
| altivec_reg, heap_data_ap->GetBytes(), |
| heap_data_ap->GetByteSize(), byte_order, error)) { |
| DataExtractor data(DataBufferSP(heap_data_ap.release()), |
| byte_order, process_sp->GetTarget() |
| .GetArchitecture() |
| .GetAddressByteSize()); |
| return_valobj_sp = ValueObjectConstResult::Create( |
| &thread, return_compiler_type, ConstString(""), data); |
| } |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| return return_valobj_sp; |
| } |
| |
| ValueObjectSP ABISysV_ppc::GetReturnValueObjectImpl( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| |
| if (!return_compiler_type) |
| return return_valobj_sp; |
| |
| ExecutionContext exe_ctx(thread.shared_from_this()); |
| return_valobj_sp = GetReturnValueObjectSimple(thread, return_compiler_type); |
| if (return_valobj_sp) |
| return return_valobj_sp; |
| |
| RegisterContextSP reg_ctx_sp = thread.GetRegisterContext(); |
| if (!reg_ctx_sp) |
| return return_valobj_sp; |
| |
| const size_t bit_width = return_compiler_type.GetBitSize(&thread); |
| if (return_compiler_type.IsAggregateType()) { |
| Target *target = exe_ctx.GetTargetPtr(); |
| bool is_memory = true; |
| if (bit_width <= 128) { |
| ByteOrder target_byte_order = target->GetArchitecture().GetByteOrder(); |
| DataBufferSP data_sp(new DataBufferHeap(16, 0)); |
| DataExtractor return_ext(data_sp, target_byte_order, |
| target->GetArchitecture().GetAddressByteSize()); |
| |
| const RegisterInfo *r3_info = reg_ctx_sp->GetRegisterInfoByName("r3", 0); |
| const RegisterInfo *rdx_info = |
| reg_ctx_sp->GetRegisterInfoByName("rdx", 0); |
| |
| RegisterValue r3_value, rdx_value; |
| reg_ctx_sp->ReadRegister(r3_info, r3_value); |
| reg_ctx_sp->ReadRegister(rdx_info, rdx_value); |
| |
| DataExtractor r3_data, rdx_data; |
| |
| r3_value.GetData(r3_data); |
| rdx_value.GetData(rdx_data); |
| |
| uint32_t fp_bytes = |
| 0; // Tracks how much of the xmm registers we've consumed so far |
| uint32_t integer_bytes = |
| 0; // Tracks how much of the r3/rds registers we've consumed so far |
| |
| const uint32_t num_children = return_compiler_type.GetNumFields(); |
| |
| // Since we are in the small struct regime, assume we are not in memory. |
| is_memory = false; |
| |
| for (uint32_t idx = 0; idx < num_children; idx++) { |
| std::string name; |
| uint64_t field_bit_offset = 0; |
| bool is_signed; |
| bool is_complex; |
| uint32_t count; |
| |
| CompilerType field_compiler_type = return_compiler_type.GetFieldAtIndex( |
| idx, name, &field_bit_offset, nullptr, nullptr); |
| const size_t field_bit_width = field_compiler_type.GetBitSize(&thread); |
| |
| // If there are any unaligned fields, this is stored in memory. |
| if (field_bit_offset % field_bit_width != 0) { |
| is_memory = true; |
| break; |
| } |
| |
| uint32_t field_byte_width = field_bit_width / 8; |
| uint32_t field_byte_offset = field_bit_offset / 8; |
| |
| DataExtractor *copy_from_extractor = nullptr; |
| uint32_t copy_from_offset = 0; |
| |
| if (field_compiler_type.IsIntegerOrEnumerationType(is_signed) || |
| field_compiler_type.IsPointerType()) { |
| if (integer_bytes < 8) { |
| if (integer_bytes + field_byte_width <= 8) { |
| // This is in RAX, copy from register to our result structure: |
| copy_from_extractor = &r3_data; |
| copy_from_offset = integer_bytes; |
| integer_bytes += field_byte_width; |
| } else { |
| // The next field wouldn't fit in the remaining space, so we |
| // pushed it to rdx. |
| copy_from_extractor = &rdx_data; |
| copy_from_offset = 0; |
| integer_bytes = 8 + field_byte_width; |
| } |
| } else if (integer_bytes + field_byte_width <= 16) { |
| copy_from_extractor = &rdx_data; |
| copy_from_offset = integer_bytes - 8; |
| integer_bytes += field_byte_width; |
| } else { |
| // The last field didn't fit. I can't see how that would happen |
| // w/o the overall size being greater than 16 bytes. For now, |
| // return a nullptr return value object. |
| return return_valobj_sp; |
| } |
| } else if (field_compiler_type.IsFloatingPointType(count, is_complex)) { |
| // Structs with long doubles are always passed in memory. |
| if (field_bit_width == 128) { |
| is_memory = true; |
| break; |
| } else if (field_bit_width == 64) { |
| copy_from_offset = 0; |
| fp_bytes += field_byte_width; |
| } else if (field_bit_width == 32) { |
| // This one is kind of complicated. If we are in an "eightbyte" |
| // with another float, we'll be stuffed into an xmm register with |
| // it. If we are in an "eightbyte" with one or more ints, then we |
| // will be stuffed into the appropriate GPR with them. |
| bool in_gpr; |
| if (field_byte_offset % 8 == 0) { |
| // We are at the beginning of one of the eightbytes, so check the |
| // next element (if any) |
| if (idx == num_children - 1) |
| in_gpr = false; |
| else { |
| uint64_t next_field_bit_offset = 0; |
| CompilerType next_field_compiler_type = |
| return_compiler_type.GetFieldAtIndex(idx + 1, name, |
| &next_field_bit_offset, |
| nullptr, nullptr); |
| if (next_field_compiler_type.IsIntegerOrEnumerationType( |
| is_signed)) |
| in_gpr = true; |
| else { |
| copy_from_offset = 0; |
| in_gpr = false; |
| } |
| } |
| } else if (field_byte_offset % 4 == 0) { |
| // We are inside of an eightbyte, so see if the field before us |
| // is floating point: This could happen if somebody put padding |
| // in the structure. |
| if (idx == 0) |
| in_gpr = false; |
| else { |
| uint64_t prev_field_bit_offset = 0; |
| CompilerType prev_field_compiler_type = |
| return_compiler_type.GetFieldAtIndex(idx - 1, name, |
| &prev_field_bit_offset, |
| nullptr, nullptr); |
| if (prev_field_compiler_type.IsIntegerOrEnumerationType( |
| is_signed)) |
| in_gpr = true; |
| else { |
| copy_from_offset = 4; |
| in_gpr = false; |
| } |
| } |
| } else { |
| is_memory = true; |
| continue; |
| } |
| |
| // Okay, we've figured out whether we are in GPR or XMM, now figure |
| // out which one. |
| if (in_gpr) { |
| if (integer_bytes < 8) { |
| // This is in RAX, copy from register to our result structure: |
| copy_from_extractor = &r3_data; |
| copy_from_offset = integer_bytes; |
| integer_bytes += field_byte_width; |
| } else { |
| copy_from_extractor = &rdx_data; |
| copy_from_offset = integer_bytes - 8; |
| integer_bytes += field_byte_width; |
| } |
| } else { |
| fp_bytes += field_byte_width; |
| } |
| } |
| } |
| |
| // These two tests are just sanity checks. If I somehow get the type |
| // calculation wrong above it is better to just return nothing than to |
| // assert or crash. |
| if (!copy_from_extractor) |
| return return_valobj_sp; |
| if (copy_from_offset + field_byte_width > |
| copy_from_extractor->GetByteSize()) |
| return return_valobj_sp; |
| |
| copy_from_extractor->CopyByteOrderedData( |
| copy_from_offset, field_byte_width, |
| data_sp->GetBytes() + field_byte_offset, field_byte_width, |
| target_byte_order); |
| } |
| |
| if (!is_memory) { |
| // The result is in our data buffer. Let's make a variable object out |
| // of it: |
| return_valobj_sp = ValueObjectConstResult::Create( |
| &thread, return_compiler_type, ConstString(""), return_ext); |
| } |
| } |
| |
| // FIXME: This is just taking a guess, r3 may very well no longer hold the |
| // return storage location. |
| // If we are going to do this right, when we make a new frame we should |
| // check to see if it uses a memory return, and if we are at the first |
| // instruction and if so stash away the return location. Then we would |
| // only return the memory return value if we know it is valid. |
| |
| if (is_memory) { |
| unsigned r3_id = |
| reg_ctx_sp->GetRegisterInfoByName("r3", 0)->kinds[eRegisterKindLLDB]; |
| lldb::addr_t storage_addr = |
| (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r3_id, |
| 0); |
| return_valobj_sp = ValueObjectMemory::Create( |
| &thread, "", Address(storage_addr, nullptr), return_compiler_type); |
| } |
| } |
| |
| return return_valobj_sp; |
| } |
| |
| bool ABISysV_ppc::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) { |
| unwind_plan.Clear(); |
| unwind_plan.SetRegisterKind(eRegisterKindDWARF); |
| |
| uint32_t lr_reg_num = dwarf_lr; |
| uint32_t sp_reg_num = dwarf_r1; |
| uint32_t pc_reg_num = dwarf_pc; |
| |
| 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("ppc at-func-entry default"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| |
| return true; |
| } |
| |
| bool ABISysV_ppc::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) { |
| unwind_plan.Clear(); |
| unwind_plan.SetRegisterKind(eRegisterKindDWARF); |
| |
| uint32_t sp_reg_num = dwarf_r1; |
| uint32_t pc_reg_num = dwarf_lr; |
| |
| UnwindPlan::RowSP row(new UnwindPlan::Row); |
| |
| const int32_t ptr_size = 4; |
| row->GetCFAValue().SetIsRegisterDereferenced(sp_reg_num); |
| |
| row->SetRegisterLocationToAtCFAPlusOffset(pc_reg_num, ptr_size * 1, true); |
| row->SetRegisterLocationToIsCFAPlusOffset(sp_reg_num, 0, true); |
| |
| unwind_plan.AppendRow(row); |
| unwind_plan.SetSourceName("ppc default unwind plan"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| unwind_plan.SetUnwindPlanValidAtAllInstructions(eLazyBoolNo); |
| unwind_plan.SetReturnAddressRegister(dwarf_lr); |
| return true; |
| } |
| |
| bool ABISysV_ppc::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 1.9 released 2004 at http://refspecs.linuxfoundation.org/ELF/ppc/PPC- |
| // elf64abi-1.9.pdf |
| |
| bool ABISysV_ppc::RegisterIsCalleeSaved(const RegisterInfo *reg_info) { |
| if (reg_info) { |
| // Preserved registers are : |
| // r1,r2,r13-r31 |
| // 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[1] <= '9') { |
| if (name[3] == '1' && name[4] >= '4') |
| return true; |
| if ((name[3] == '2' || name[3] == '3') && name[4] != '\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 true; |
| if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0') // pc |
| return true; |
| } |
| return false; |
| } |
| |
| void ABISysV_ppc::Initialize() { |
| PluginManager::RegisterPlugin(GetPluginNameStatic(), |
| "System V ABI for ppc targets", CreateInstance); |
| } |
| |
| void ABISysV_ppc::Terminate() { |
| PluginManager::UnregisterPlugin(CreateInstance); |
| } |
| |
| lldb_private::ConstString ABISysV_ppc::GetPluginNameStatic() { |
| static ConstString g_name("sysv-ppc"); |
| return g_name; |
| } |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol |
| //------------------------------------------------------------------ |
| |
| lldb_private::ConstString ABISysV_ppc::GetPluginName() { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t ABISysV_ppc::GetPluginVersion() { return 1; } |