This structure is supposed to be trivial, so we cannot simply do "= nullptr;" on the new member. Doing that means you are non trivial, regardless of whether you emulate the previously implied constructor somehow. The next option is to update every use of brace initialisation. Given that this is some hundreds of lines, this change just adds a dummy pointer that is set to nullptr. Subsequent changes will actually use that to point to register flags information. Note: This change is not clang-format-ted because it changes a bunch of areas that are not themselves formatted. It would just add noise. Reviewed By: jasonmolenda, JDevlieghere Differential Revision: https://reviews.llvm.org/D145568
602 lines
20 KiB
C++
602 lines
20 KiB
C++
//===-- ABISysV_arc.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_arc.h"
|
|
|
|
// C Includes
|
|
// C++ Includes
|
|
#include <array>
|
|
#include <limits>
|
|
#include <type_traits>
|
|
|
|
// Other libraries and framework includes
|
|
#include "llvm/IR/DerivedTypes.h"
|
|
#include "llvm/Support/MathExtras.h"
|
|
#include "llvm/TargetParser/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/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, \
|
|
}
|
|
|
|
#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;
|
|
|
|
LLDB_PLUGIN_DEFINE_ADV(ABISysV_arc, ABIARC)
|
|
|
|
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.value_or(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();
|
|
}
|
|
|
|
static const size_t word_size = 4U;
|
|
static const size_t reg_size = word_size;
|
|
|
|
static inline size_t AugmentArgSize(size_t size_in_bytes) {
|
|
return llvm::alignTo(size_in_bytes, word_size);
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
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(llvm::ArrayRef(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;
|
|
}
|
|
|
|
template <typename T>
|
|
static 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);
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
static 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;
|
|
}
|
|
|
|
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(&thread).value_or(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::ValueType::Scalar);
|
|
}
|
|
// 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::ValueType::Scalar);
|
|
}
|
|
// 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(&thread).value_or(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 boolean 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::ValueType::Scalar);
|
|
}
|
|
// 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);
|
|
}
|