| //===-- ABISysV_arc.cpp ---------------------------------------*- C++ -*-===// |
| // |
| // 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_arc.h" |
| |
| // C Includes |
| // C++ Includes |
| #include <array> |
| #include <limits> |
| #include <type_traits> |
| |
| // Other libraries and framework includes |
| #include "llvm/ADT/Triple.h" |
| #include "llvm/IR/DerivedTypes.h" |
| #include "llvm/Support/MathExtras.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/RegisterValue.h" |
| #include "lldb/Utility/Status.h" |
| |
| #define DEFINE_REG_NAME(reg_num) ConstString(#reg_num).GetCString() |
| #define DEFINE_REG_NAME_STR(reg_name) ConstString(reg_name).GetCString() |
| |
| // The ABI is not a source of such information as size, offset, encoding, etc. |
| // of a register. Just provides correct dwarf and eh_frame numbers. |
| |
| #define DEFINE_GENERIC_REGISTER_STUB(dwarf_num, str_name, generic_num) \ |
| { \ |
| DEFINE_REG_NAME(dwarf_num), DEFINE_REG_NAME_STR(str_name), \ |
| 0, 0, eEncodingInvalid, eFormatDefault, \ |
| { dwarf_num, dwarf_num, generic_num, LLDB_INVALID_REGNUM, dwarf_num }, \ |
| nullptr, nullptr, nullptr, 0 \ |
| } |
| |
| #define DEFINE_REGISTER_STUB(dwarf_num, str_name) \ |
| DEFINE_GENERIC_REGISTER_STUB(dwarf_num, str_name, LLDB_INVALID_REGNUM) |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| namespace { |
| namespace dwarf { |
| enum regnums { |
| r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15, r16, |
| r17, r18, r19, r20, r21, r22, r23, r24, r25, r26, |
| r27, fp = r27, r28, sp = r28, r29, r30, r31, blink = r31, |
| r32, r33, r34, r35, r36, r37, r38, r39, r40, r41, r42, r43, r44, r45, r46, |
| r47, r48, r49, r50, r51, r52, r53, r54, r55, r56, r57, r58, r59, r60, |
| /*reserved,*/ /*limm indicator,*/ r63 = 63, pc = 70, status32 = 74 |
| }; |
| |
| static const std::array<RegisterInfo, 64> g_register_infos = { { |
| DEFINE_GENERIC_REGISTER_STUB(r0, nullptr, LLDB_REGNUM_GENERIC_ARG1), |
| DEFINE_GENERIC_REGISTER_STUB(r1, nullptr, LLDB_REGNUM_GENERIC_ARG2), |
| DEFINE_GENERIC_REGISTER_STUB(r2, nullptr, LLDB_REGNUM_GENERIC_ARG3), |
| DEFINE_GENERIC_REGISTER_STUB(r3, nullptr, LLDB_REGNUM_GENERIC_ARG4), |
| DEFINE_GENERIC_REGISTER_STUB(r4, nullptr, LLDB_REGNUM_GENERIC_ARG5), |
| DEFINE_GENERIC_REGISTER_STUB(r5, nullptr, LLDB_REGNUM_GENERIC_ARG6), |
| DEFINE_GENERIC_REGISTER_STUB(r6, nullptr, LLDB_REGNUM_GENERIC_ARG7), |
| DEFINE_GENERIC_REGISTER_STUB(r7, nullptr, LLDB_REGNUM_GENERIC_ARG8), |
| DEFINE_REGISTER_STUB(r8, nullptr), |
| DEFINE_REGISTER_STUB(r9, nullptr), |
| DEFINE_REGISTER_STUB(r10, nullptr), |
| DEFINE_REGISTER_STUB(r11, nullptr), |
| DEFINE_REGISTER_STUB(r12, nullptr), |
| DEFINE_REGISTER_STUB(r13, nullptr), |
| DEFINE_REGISTER_STUB(r14, nullptr), |
| DEFINE_REGISTER_STUB(r15, nullptr), |
| DEFINE_REGISTER_STUB(r16, nullptr), |
| DEFINE_REGISTER_STUB(r17, nullptr), |
| DEFINE_REGISTER_STUB(r18, nullptr), |
| DEFINE_REGISTER_STUB(r19, nullptr), |
| DEFINE_REGISTER_STUB(r20, nullptr), |
| DEFINE_REGISTER_STUB(r21, nullptr), |
| DEFINE_REGISTER_STUB(r22, nullptr), |
| DEFINE_REGISTER_STUB(r23, nullptr), |
| DEFINE_REGISTER_STUB(r24, nullptr), |
| DEFINE_REGISTER_STUB(r25, nullptr), |
| DEFINE_REGISTER_STUB(r26, "gp"), |
| DEFINE_GENERIC_REGISTER_STUB(r27, "fp", LLDB_REGNUM_GENERIC_FP), |
| DEFINE_GENERIC_REGISTER_STUB(r28, "sp", LLDB_REGNUM_GENERIC_SP), |
| DEFINE_REGISTER_STUB(r29, "ilink"), |
| DEFINE_REGISTER_STUB(r30, nullptr), |
| DEFINE_GENERIC_REGISTER_STUB(r31, "blink", LLDB_REGNUM_GENERIC_RA), |
| DEFINE_REGISTER_STUB(r32, nullptr), |
| DEFINE_REGISTER_STUB(r33, nullptr), |
| DEFINE_REGISTER_STUB(r34, nullptr), |
| DEFINE_REGISTER_STUB(r35, nullptr), |
| DEFINE_REGISTER_STUB(r36, nullptr), |
| DEFINE_REGISTER_STUB(r37, nullptr), |
| DEFINE_REGISTER_STUB(r38, nullptr), |
| DEFINE_REGISTER_STUB(r39, nullptr), |
| DEFINE_REGISTER_STUB(r40, nullptr), |
| DEFINE_REGISTER_STUB(r41, nullptr), |
| DEFINE_REGISTER_STUB(r42, nullptr), |
| DEFINE_REGISTER_STUB(r43, nullptr), |
| DEFINE_REGISTER_STUB(r44, nullptr), |
| DEFINE_REGISTER_STUB(r45, nullptr), |
| DEFINE_REGISTER_STUB(r46, nullptr), |
| DEFINE_REGISTER_STUB(r47, nullptr), |
| DEFINE_REGISTER_STUB(r48, nullptr), |
| DEFINE_REGISTER_STUB(r49, nullptr), |
| DEFINE_REGISTER_STUB(r50, nullptr), |
| DEFINE_REGISTER_STUB(r51, nullptr), |
| DEFINE_REGISTER_STUB(r52, nullptr), |
| DEFINE_REGISTER_STUB(r53, nullptr), |
| DEFINE_REGISTER_STUB(r54, nullptr), |
| DEFINE_REGISTER_STUB(r55, nullptr), |
| DEFINE_REGISTER_STUB(r56, nullptr), |
| DEFINE_REGISTER_STUB(r57, nullptr), |
| DEFINE_REGISTER_STUB(r58, "accl"), |
| DEFINE_REGISTER_STUB(r59, "acch"), |
| DEFINE_REGISTER_STUB(r60, "lp_count"), |
| DEFINE_REGISTER_STUB(r63, "pcl"), |
| DEFINE_GENERIC_REGISTER_STUB(pc, nullptr, LLDB_REGNUM_GENERIC_PC), |
| DEFINE_GENERIC_REGISTER_STUB(status32, nullptr, LLDB_REGNUM_GENERIC_FLAGS)} }; |
| } // namespace dwarf |
| } // namespace |
| |
| const RegisterInfo *ABISysV_arc::GetRegisterInfoArray(uint32_t &count) { |
| count = dwarf::g_register_infos.size(); |
| return dwarf::g_register_infos.data(); |
| } |
| |
| size_t ABISysV_arc::GetRedZoneSize() const { return 0; } |
| |
| bool ABISysV_arc::IsRegisterFileReduced(RegisterContext ®_ctx) const { |
| if (!m_is_reg_file_reduced) { |
| const auto *const rf_build_reg = reg_ctx.GetRegisterInfoByName("rf_build"); |
| |
| const auto reg_value = reg_ctx.ReadRegisterAsUnsigned(rf_build_reg, |
| /*fail_value*/ 0); |
| // RF_BUILD "Number of Entries" bit. |
| const uint32_t rf_entries_bit = 1U << 9U; |
| m_is_reg_file_reduced = (reg_value | rf_entries_bit) != 0; |
| } |
| |
| return m_is_reg_file_reduced.getValueOr(false); |
| } |
| |
| //------------------------------------------------------------------ |
| // Static Functions |
| //------------------------------------------------------------------ |
| |
| ABISP ABISysV_arc::CreateInstance(ProcessSP process_sp, const ArchSpec &arch) { |
| return llvm::Triple::arc == arch.GetTriple().getArch() ? |
| ABISP(new ABISysV_arc(std::move(process_sp), MakeMCRegisterInfo(arch))) : |
| ABISP(); |
| } |
| |
| namespace { |
| const size_t word_size = 4U; |
| const size_t reg_size = word_size; |
| |
| inline size_t AugmentArgSize(size_t size_in_bytes) { |
| return llvm::alignTo(size_in_bytes, word_size); |
| } |
| |
| size_t TotalArgsSizeInWords(const llvm::ArrayRef<ABI::CallArgument> &args) { |
| size_t total_size = 0; |
| for (const auto &arg : args) |
| total_size += |
| (ABI::CallArgument::TargetValue == arg.type ? AugmentArgSize(arg.size) |
| : reg_size) / |
| word_size; |
| |
| return total_size; |
| } |
| } // namespace |
| |
| bool ABISysV_arc::PrepareTrivialCall(Thread &thread, addr_t sp, |
| addr_t func_addr, addr_t return_addr, |
| llvm::ArrayRef<addr_t> args) const { |
| // We don't use the traditional trivial call specialized for jit. |
| return false; |
| } |
| |
| bool ABISysV_arc::PrepareTrivialCall(Thread &thread, addr_t sp, addr_t pc, |
| addr_t ra, llvm::Type &prototype, |
| llvm::ArrayRef<ABI::CallArgument> args) const { |
| auto reg_ctx = thread.GetRegisterContext(); |
| if (!reg_ctx) |
| return false; |
| |
| uint32_t pc_reg = reg_ctx->ConvertRegisterKindToRegisterNumber( |
| eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC); |
| if (pc_reg == LLDB_INVALID_REGNUM) |
| return false; |
| |
| uint32_t ra_reg = reg_ctx->ConvertRegisterKindToRegisterNumber( |
| eRegisterKindGeneric, LLDB_REGNUM_GENERIC_RA); |
| if (ra_reg == LLDB_INVALID_REGNUM) |
| return false; |
| |
| uint32_t sp_reg = reg_ctx->ConvertRegisterKindToRegisterNumber( |
| eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); |
| if (sp_reg == LLDB_INVALID_REGNUM) |
| return false; |
| |
| Status error; |
| ProcessSP process = thread.GetProcess(); |
| if (!process) |
| return false; |
| |
| // Push host data onto target. |
| for (const auto &arg : args) { |
| // Skip over target values. |
| if (arg.type == ABI::CallArgument::TargetValue) |
| continue; |
| |
| // Create space on the stack for this data 4-byte aligned. |
| sp -= AugmentArgSize(arg.size); |
| |
| if (process->WriteMemory(sp, arg.data_up.get(), arg.size, error) < arg.size |
| || error.Fail()) |
| return false; |
| |
| // Update the argument with the target pointer. |
| *const_cast<addr_t *>(&arg.value) = sp; |
| } |
| |
| // Make sure number of parameters matches prototype. |
| assert(!prototype.isFunctionVarArg()); |
| assert(prototype.getFunctionNumParams() == args.size()); |
| |
| const size_t regs_for_args_count = IsRegisterFileReduced(*reg_ctx) ? 4U : 8U; |
| |
| // Number of arguments passed on stack. |
| auto args_size = TotalArgsSizeInWords(args); |
| auto on_stack = |
| args_size <= regs_for_args_count ? 0 : args_size - regs_for_args_count; |
| auto offset = on_stack * word_size; |
| |
| uint8_t reg_value[reg_size]; |
| size_t reg_index = LLDB_REGNUM_GENERIC_ARG1; |
| |
| for (const auto &arg : args) { |
| auto value = reinterpret_cast<const uint8_t *>(&arg.value); |
| auto size = |
| ABI::CallArgument::TargetValue == arg.type ? arg.size : reg_size; |
| |
| // Pass arguments via registers. |
| while (size > 0 && reg_index < regs_for_args_count) { |
| size_t byte_index = 0; |
| auto end = size < reg_size ? size : reg_size; |
| |
| while (byte_index < end) { |
| reg_value[byte_index++] = *(value++); |
| --size; |
| } |
| |
| while (byte_index < reg_size) { |
| reg_value[byte_index++] = 0; |
| } |
| |
| RegisterValue reg_val_obj(reg_value, reg_size, eByteOrderLittle); |
| if (!reg_ctx->WriteRegister( |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, reg_index), |
| reg_val_obj)) |
| return false; |
| |
| // NOTE: It's unsafe to iterate through LLDB_REGNUM_GENERICs. |
| ++reg_index; |
| } |
| |
| if (reg_index < regs_for_args_count || size == 0) |
| continue; |
| |
| // Remaining arguments are passed on the stack. |
| if (process->WriteMemory(sp - offset, value, size, error) < size || |
| !error.Success()) |
| return false; |
| |
| offset -= AugmentArgSize(size); |
| } |
| |
| // Set stack pointer immediately below arguments. |
| sp -= on_stack * word_size; |
| |
| // Update registers with current function call state. |
| reg_ctx->WriteRegisterFromUnsigned(pc_reg, pc); |
| reg_ctx->WriteRegisterFromUnsigned(ra_reg, ra); |
| reg_ctx->WriteRegisterFromUnsigned(sp_reg, sp); |
| |
| return true; |
| } |
| |
| bool ABISysV_arc::GetArgumentValues(Thread &thread, ValueList &values) const { |
| return false; |
| } |
| |
| Status ABISysV_arc::SetReturnValueObject(StackFrameSP &frame_sp, |
| ValueObjectSP &new_value_sp) { |
| Status result; |
| if (!new_value_sp) { |
| result.SetErrorString("Empty value object for return value."); |
| return result; |
| } |
| |
| CompilerType compiler_type = new_value_sp->GetCompilerType(); |
| if (!compiler_type) { |
| result.SetErrorString("Null clang type for return value."); |
| return result; |
| } |
| |
| auto ®_ctx = *frame_sp->GetThread()->GetRegisterContext(); |
| |
| bool is_signed = false; |
| if (!compiler_type.IsIntegerOrEnumerationType(is_signed) && |
| !compiler_type.IsPointerType()) { |
| result.SetErrorString("We don't support returning other types at present"); |
| return result; |
| } |
| |
| DataExtractor data; |
| size_t num_bytes = new_value_sp->GetData(data, result); |
| |
| if (result.Fail()) { |
| result.SetErrorStringWithFormat( |
| "Couldn't convert return value to raw data: %s", result.AsCString()); |
| return result; |
| } |
| |
| if (num_bytes <= 2 * reg_size) { |
| offset_t offset = 0; |
| uint64_t raw_value = data.GetMaxU64(&offset, num_bytes); |
| |
| auto reg_info = |
| reg_ctx.GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1); |
| if (!reg_ctx.WriteRegisterFromUnsigned(reg_info, raw_value)) { |
| result.SetErrorStringWithFormat("Couldn't write value to register %s", |
| reg_info->name); |
| return result; |
| } |
| |
| if (num_bytes <= reg_size) |
| return result; // Successfully written. |
| |
| raw_value >>= 32; |
| reg_info = |
| reg_ctx.GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2); |
| if (!reg_ctx.WriteRegisterFromUnsigned(reg_info, raw_value)) { |
| result.SetErrorStringWithFormat("Couldn't write value to register %s", |
| reg_info->name); |
| } |
| |
| return result; |
| } |
| |
| result.SetErrorString( |
| "We don't support returning large integer values at present."); |
| return result; |
| } |
| |
| namespace { |
| template <typename T> |
| void SetInteger(Scalar &scalar, uint64_t raw_value, bool is_signed) { |
| raw_value &= std::numeric_limits<T>::max(); |
| if (is_signed) |
| scalar = static_cast<typename std::make_signed<T>::type>(raw_value); |
| else |
| scalar = static_cast<T>(raw_value); |
| } |
| |
| bool SetSizedInteger(Scalar &scalar, uint64_t raw_value, uint8_t size_in_bytes, |
| bool is_signed) { |
| switch (size_in_bytes) { |
| default: |
| return false; |
| |
| case sizeof(uint64_t): |
| SetInteger<uint64_t>(scalar, raw_value, is_signed); |
| break; |
| |
| case sizeof(uint32_t): |
| SetInteger<uint32_t>(scalar, raw_value, is_signed); |
| break; |
| |
| case sizeof(uint16_t): |
| SetInteger<uint16_t>(scalar, raw_value, is_signed); |
| break; |
| |
| case sizeof(uint8_t): |
| SetInteger<uint8_t>(scalar, raw_value, is_signed); |
| break; |
| } |
| |
| return true; |
| } |
| |
| bool SetSizedFloat(Scalar &scalar, uint64_t raw_value, uint8_t size_in_bytes) { |
| switch (size_in_bytes) { |
| default: |
| return false; |
| |
| case sizeof(uint64_t): |
| scalar = *reinterpret_cast<double *>(&raw_value); |
| break; |
| |
| case sizeof(uint32_t): |
| scalar = *reinterpret_cast<float *>(&raw_value); |
| break; |
| } |
| |
| return true; |
| } |
| |
| uint64_t ReadRawValue(const RegisterContextSP ®_ctx, uint8_t size_in_bytes) { |
| auto reg_info_r0 = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1); |
| |
| // Extract the register context so we can read arguments from registers. |
| uint64_t raw_value = |
| reg_ctx->ReadRegisterAsUnsigned(reg_info_r0, 0) & UINT32_MAX; |
| |
| if (sizeof(uint64_t) == size_in_bytes) |
| raw_value |= (reg_ctx->ReadRegisterAsUnsigned( |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, |
| LLDB_REGNUM_GENERIC_ARG2), 0) & |
| UINT64_MAX) << 32U; |
| |
| return raw_value; |
| } |
| } // namespace |
| |
| ValueObjectSP |
| ABISysV_arc::GetReturnValueObjectSimple(Thread &thread, |
| CompilerType &compiler_type) const { |
| if (!compiler_type) |
| return ValueObjectSP(); |
| |
| auto reg_ctx = thread.GetRegisterContext(); |
| if (!reg_ctx) |
| return ValueObjectSP(); |
| |
| Value value; |
| value.SetCompilerType(compiler_type); |
| |
| const uint32_t type_flags = compiler_type.GetTypeInfo(); |
| // Integer return type. |
| if (type_flags & eTypeIsInteger) { |
| const size_t byte_size = compiler_type.GetByteSize(nullptr).getValueOr(0); |
| auto raw_value = ReadRawValue(reg_ctx, byte_size); |
| |
| const bool is_signed = (type_flags & eTypeIsSigned) != 0; |
| if (!SetSizedInteger(value.GetScalar(), raw_value, byte_size, is_signed)) |
| return ValueObjectSP(); |
| |
| value.SetValueType(Value::eValueTypeScalar); |
| } |
| // Pointer return type. |
| else if (type_flags & eTypeIsPointer) { |
| auto reg_info_r0 = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, |
| LLDB_REGNUM_GENERIC_ARG1); |
| value.GetScalar() = reg_ctx->ReadRegisterAsUnsigned(reg_info_r0, 0); |
| |
| value.SetValueType(Value::eValueTypeScalar); |
| } |
| // Floating point return type. |
| else if (type_flags & eTypeIsFloat) { |
| uint32_t float_count = 0; |
| bool is_complex = false; |
| |
| if (compiler_type.IsFloatingPointType(float_count, is_complex) && |
| 1 == float_count && !is_complex) { |
| const size_t byte_size = compiler_type.GetByteSize(nullptr).getValueOr(0); |
| auto raw_value = ReadRawValue(reg_ctx, byte_size); |
| |
| if (!SetSizedFloat(value.GetScalar(), raw_value, byte_size)) |
| return ValueObjectSP(); |
| } |
| } |
| // Unsupported return type. |
| else |
| return ValueObjectSP(); |
| |
| return ValueObjectConstResult::Create(thread.GetStackFrameAtIndex(0).get(), |
| value, ConstString("")); |
| } |
| |
| ValueObjectSP ABISysV_arc::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 GetReturnValueObjectSimple(thread, return_compiler_type); |
| } |
| |
| ValueObjectSP ABISysV_arc::GetReturnValueObjectImpl(Thread &thread, |
| llvm::Type &retType) const { |
| auto reg_ctx = thread.GetRegisterContext(); |
| if (!reg_ctx) |
| return ValueObjectSP(); |
| |
| Value value; |
| // Void return type. |
| if (retType.isVoidTy()) { |
| value.GetScalar() = 0; |
| } |
| // Integer return type. |
| else if (retType.isIntegerTy()) { |
| size_t byte_size = retType.getPrimitiveSizeInBits(); |
| if (1 != byte_size) // For boolian type. |
| byte_size /= CHAR_BIT; |
| |
| auto raw_value = ReadRawValue(reg_ctx, byte_size); |
| |
| const bool is_signed = false; // IR Type doesn't provide this info. |
| if (!SetSizedInteger(value.GetScalar(), raw_value, byte_size, is_signed)) |
| return ValueObjectSP(); |
| } |
| // Pointer return type. |
| else if (retType.isPointerTy()) { |
| auto reg_info_r0 = reg_ctx->GetRegisterInfo(eRegisterKindGeneric, |
| LLDB_REGNUM_GENERIC_ARG1); |
| value.GetScalar() = reg_ctx->ReadRegisterAsUnsigned(reg_info_r0, 0); |
| value.SetValueType(Value::eValueTypeScalar); |
| } |
| // Floating point return type. |
| else if (retType.isFloatingPointTy()) { |
| const size_t byte_size = retType.getPrimitiveSizeInBits() / CHAR_BIT; |
| auto raw_value = ReadRawValue(reg_ctx, byte_size); |
| |
| if (!SetSizedFloat(value.GetScalar(), raw_value, byte_size)) |
| return ValueObjectSP(); |
| } |
| // Unsupported return type. |
| else |
| return ValueObjectSP(); |
| |
| return ValueObjectConstResult::Create(thread.GetStackFrameAtIndex(0).get(), |
| value, ConstString("")); |
| } |
| |
| bool ABISysV_arc::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) { |
| unwind_plan.Clear(); |
| unwind_plan.SetRegisterKind(eRegisterKindDWARF); |
| |
| UnwindPlan::RowSP row(new UnwindPlan::Row); |
| |
| // Our Call Frame Address is the stack pointer value. |
| row->GetCFAValue().SetIsRegisterPlusOffset(dwarf::sp, 0); |
| |
| // The previous PC is in the BLINK. |
| row->SetRegisterLocationToRegister(dwarf::pc, dwarf::blink, true); |
| unwind_plan.AppendRow(row); |
| |
| // All other registers are the same. |
| unwind_plan.SetSourceName("arc at-func-entry default"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| |
| return true; |
| } |
| |
| bool ABISysV_arc::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) { |
| return false; |
| } |
| |
| bool ABISysV_arc::RegisterIsVolatile(const RegisterInfo *reg_info) { |
| if (nullptr == reg_info) |
| return false; |
| |
| // Volatile registers are: r0..r12. |
| uint32_t regnum = reg_info->kinds[eRegisterKindDWARF]; |
| if (regnum <= 12) |
| return true; |
| |
| static const std::string ra_reg_name = "blink"; |
| return ra_reg_name == reg_info->name; |
| } |
| |
| void ABISysV_arc::Initialize() { |
| PluginManager::RegisterPlugin(GetPluginNameStatic(), |
| "System V ABI for ARC targets", CreateInstance); |
| } |
| |
| void ABISysV_arc::Terminate() { |
| PluginManager::UnregisterPlugin(CreateInstance); |
| } |
| |
| ConstString ABISysV_arc::GetPluginNameStatic() { |
| static ConstString g_name("sysv-arc"); |
| return g_name; |
| } |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol |
| //------------------------------------------------------------------ |
| |
| ConstString ABISysV_arc::GetPluginName() { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t ABISysV_arc::GetPluginVersion() { return 1; } |