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// Copyright 2023 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Common/Assembler/GekkoAssembler.h"
#include <array>
#include <string>
#include <vector>
#include <fmt/format.h>
#include "Common/Assembler/AssemblerShared.h"
#include "Common/Assembler/AssemblerTables.h"
#include "Common/Assembler/GekkoIRGen.h"
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
namespace Common::GekkoAssembler
{
namespace
{
using namespace Common::GekkoAssembler::detail;
FailureOr<u32> FillInstruction(const MnemonicDesc& desc, const OperandList& operands,
std::string_view inst_line)
{
// Parser shouldn't allow this to pass
ASSERT_MSG(COMMON, desc.operand_count == operands.count && !operands.overfill,
"Unexpected operand count mismatch for instruction {}. Expected {} but found {}",
inst_line, desc.operand_count, operands.overfill ? 6 : operands.count);
u32 instruction = desc.initial_value;
for (u32 i = 0; i < operands.count; i++)
{
if (!desc.operand_masks[i].Fits(operands[i]))
{
std::string message;
const u32 trunc_bits = desc.operand_masks[i].TruncBits();
if (trunc_bits == 0)
{
if (desc.operand_masks[i].is_signed)
{
message = fmt::format("{:#x} not between {:#x} and {:#x}", static_cast<s32>(operands[i]),
static_cast<s32>(desc.operand_masks[i].MinVal()),
static_cast<s32>(desc.operand_masks[i].MaxVal()));
}
else
{
message = fmt::format("{:#x} not between {:#x} and {:#x}", operands[i],
desc.operand_masks[i].MinVal(), desc.operand_masks[i].MaxVal());
}
}
else
{
if (desc.operand_masks[i].is_signed)
{
message = fmt::format("{:#x} not between {:#x} and {:#x} or not aligned to {}",
static_cast<s32>(operands[i]),
static_cast<s32>(desc.operand_masks[i].MinVal()),
static_cast<s32>(desc.operand_masks[i].MaxVal()), trunc_bits + 1);
}
else
{
message = fmt::format("{:#x} not between {:#x} and {:#x} or not aligned to {}",
operands[i], desc.operand_masks[i].MinVal(),
desc.operand_masks[i].MaxVal(), trunc_bits + 1);
}
}
return AssemblerError{std::move(message), "", 0, TagOf(operands.list[i]).begin,
TagOf(operands.list[i]).len};
}
instruction |= desc.operand_masks[i].Fit(operands[i]);
}
return instruction;
}
void AdjustOperandsForGas(GekkoMnemonic mnemonic, OperandList& ops_list)
{
switch (mnemonic)
{
case GekkoMnemonic::Cmp:
case GekkoMnemonic::Cmpl:
case GekkoMnemonic::Cmpi:
case GekkoMnemonic::Cmpli:
if (ops_list.count < 4)
{
ops_list.Insert(0, 0);
}
break;
case GekkoMnemonic::Addis:
// Because GAS wants to allow for addis and lis to work nice with absolute addresses, the
// immediate operand should also "fit" into the _UIMM field, so just turn a valid UIMM into a
// SIMM
if (ops_list[2] >= 0x8000 && ops_list[2] <= 0xffff)
{
ops_list[2] = ops_list[2] - 0x10000;
}
break;
default:
break;
}
}
} // namespace
void CodeBlock::PushBigEndian(u32 val)
{
instructions.push_back((val >> 24) & 0xff);
instructions.push_back((val >> 16) & 0xff);
instructions.push_back((val >> 8) & 0xff);
instructions.push_back(val & 0xff);
}
FailureOr<std::vector<CodeBlock>> Assemble(std::string_view instruction,
u32 current_instruction_address)
{
FailureOr<detail::GekkoIR> parse_result =
detail::ParseToIR(instruction, current_instruction_address);
if (IsFailure(parse_result))
{
return GetFailure(parse_result);
}
const auto& parsed_blocks = GetT(parse_result).blocks;
const auto& operands = GetT(parse_result).operand_pool;
std::vector<CodeBlock> out_blocks;
for (const detail::IRBlock& parsed_block : parsed_blocks)
{
CodeBlock new_block(parsed_block.block_address);
for (const detail::ChunkVariant& chunk : parsed_block.chunks)
{
if (std::holds_alternative<detail::InstChunk>(chunk))
{
for (const detail::GekkoInstruction& parsed_inst : std::get<detail::InstChunk>(chunk))
{
OperandList adjusted_ops;
ASSERT(parsed_inst.op_interval.len <= MAX_OPERANDS);
adjusted_ops.Copy(operands.begin() + parsed_inst.op_interval.begin,
operands.begin() + parsed_inst.op_interval.End());
size_t idx = parsed_inst.mnemonic_index;
if (parsed_inst.is_extended)
{
extended_mnemonics[idx].transform_operands(adjusted_ops);
idx = extended_mnemonics[idx].mnemonic_index;
}
AdjustOperandsForGas(static_cast<GekkoMnemonic>(idx >> 2), adjusted_ops);
FailureOr<u32> inst = FillInstruction(mnemonics[idx], adjusted_ops, parsed_inst.raw_text);
if (IsFailure(inst))
{
GetFailure(inst).error_line = parsed_inst.raw_text;
GetFailure(inst).line = parsed_inst.line_number;
return GetFailure(inst);
}
new_block.PushBigEndian(GetT(inst));
}
}
else if (std::holds_alternative<detail::ByteChunk>(chunk))
{
detail::ByteChunk byte_arr = std::get<detail::ByteChunk>(chunk);
new_block.instructions.insert(new_block.instructions.end(), byte_arr.begin(),
byte_arr.end());
}
else if (std::holds_alternative<detail::PadChunk>(chunk))
{
detail::PadChunk pad_len = std::get<detail::PadChunk>(chunk);
new_block.instructions.insert(new_block.instructions.end(), pad_len, 0);
}
else
{
ASSERT(false);
}
}
if (!new_block.instructions.empty())
{
out_blocks.emplace_back(std::move(new_block));
}
}
return out_blocks;
}
} // namespace Common::GekkoAssembler
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