diff options
Diffstat (limited to 'lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp')
| -rw-r--r-- | lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp | 982 |
1 files changed, 982 insertions, 0 deletions
diff --git a/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp b/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp new file mode 100644 index 000000000000..6f5eded7b031 --- /dev/null +++ b/lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc.cpp @@ -0,0 +1,982 @@ +//===-- ABISysV_ppc.cpp ---------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "ABISysV_ppc.h" + +#include "llvm/ADT/STLExtras.h" +#include "llvm/ADT/Triple.h" + +#include "lldb/Core/Module.h" +#include "lldb/Core/PluginManager.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/RegisterValue.h" +#include "lldb/Utility/Status.h" + +using namespace lldb; +using namespace lldb_private; + +LLDB_PLUGIN_DEFINE(ABISysV_ppc) + +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) { + if (arch.GetTriple().getArch() == llvm::Triple::ppc) { + return ABISP( + new ABISysV_ppc(std::move(process_sp), MakeMCRegisterInfo(arch))); + } + 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); + LLDB_LOGF(log, "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 + + LLDB_LOGF(log, "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; + + LLDB_LOGF(log, + "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. + + LLDB_LOGF(log, "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. + + LLDB_LOGF(log, "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(); + llvm::Optional<uint64_t> bit_size = compiler_type.GetBitSize(&thread); + if (!bit_size) + return false; + bool is_signed; + if (compiler_type.IsIntegerOrEnumerationType(is_signed)) + ReadIntegerArgument(value->GetScalar(), *bit_size, is_signed, thread, + argument_register_ids, current_argument_register, + current_stack_argument); + else if (compiler_type.IsPointerType()) + ReadIntegerArgument(value->GetScalar(), *bit_size, 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 { + llvm::Optional<uint64_t> bit_width = + compiler_type.GetBitSize(frame_sp.get()); + if (!bit_width) { + error.SetErrorString("can't get type size"); + return error; + } + 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 + + llvm::Optional<uint64_t> byte_size = + return_compiler_type.GetByteSize(nullptr); + if (!byte_size) + return return_valobj_sp; + 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 { + llvm::Optional<uint64_t> byte_size = + return_compiler_type.GetByteSize(nullptr); + if (byte_size && *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) { + llvm::Optional<uint64_t> byte_size = + return_compiler_type.GetByteSize(nullptr); + if (byte_size && *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_up( + 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_up->GetBytes(), + heap_data_up->GetByteSize(), byte_order, error)) { + DataExtractor data(DataBufferSP(heap_data_up.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; + + llvm::Optional<uint64_t> bit_width = return_compiler_type.GetBitSize(&thread); + if (!bit_width) + return return_valobj_sp; + 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); + llvm::Optional<uint64_t> field_bit_width = + field_compiler_type.GetBitSize(&thread); + if (!field_bit_width) + return return_valobj_sp; + + // 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.SetUnwindPlanForSignalTrap(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; } |