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-rw-r--r--source/Plugins/ABI/SysV-arc/ABISysV_arc.cpp614
1 files changed, 614 insertions, 0 deletions
diff --git a/source/Plugins/ABI/SysV-arc/ABISysV_arc.cpp b/source/Plugins/ABI/SysV-arc/ABISysV_arc.cpp
new file mode 100644
index 000000000000..715b5e5d2b95
--- /dev/null
+++ b/source/Plugins/ABI/SysV-arc/ABISysV_arc.cpp
@@ -0,0 +1,614 @@
+//===-- 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 &reg_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 &reg_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 &reg_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; }