1455 lines
No EOL
45 KiB
C#
1455 lines
No EOL
45 KiB
C#
using ARMeilleure.CodeGen.Linking;
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using ARMeilleure.IntermediateRepresentation;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace ARMeilleure.CodeGen.X86
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{
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partial class Assembler
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{
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private const int ReservedBytesForJump = 1;
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private const int OpModRMBits = 24;
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private const byte RexPrefix = 0x40;
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private const byte RexWPrefix = 0x48;
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private const byte LockPrefix = 0xf0;
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private const int MaxRegNumber = 15;
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private struct Jump
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{
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public bool IsConditional { get; }
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public X86Condition Condition { get; }
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public Operand JumpLabel { get; }
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public long? JumpTarget { get; set; }
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public long JumpPosition { get; }
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public long Offset { get; set; }
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public int InstSize { get; set; }
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public Jump(Operand jumpLabel, long jumpPosition)
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{
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IsConditional = false;
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Condition = 0;
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JumpLabel = jumpLabel;
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JumpTarget = null;
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JumpPosition = jumpPosition;
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Offset = 0;
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InstSize = 0;
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}
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public Jump(X86Condition condition, Operand jumpLabel, long jumpPosition)
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{
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IsConditional = true;
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Condition = condition;
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JumpLabel = jumpLabel;
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JumpTarget = null;
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JumpPosition = jumpPosition;
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Offset = 0;
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InstSize = 0;
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}
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}
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private struct Reloc
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{
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public int JumpIndex { get; set; }
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public int Position { get; set; }
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public Symbol Symbol { get; set; }
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}
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private readonly List<Jump> _jumps;
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private readonly List<Reloc> _relocs;
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private readonly Dictionary<Operand, long> _labels;
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private readonly Stream _stream;
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public bool HasRelocs => _relocs != null;
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public Assembler(Stream stream, bool relocatable)
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{
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_stream = stream;
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_labels = new Dictionary<Operand, long>();
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_jumps = new List<Jump>();
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_relocs = relocatable ? new List<Reloc>() : null;
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}
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public void MarkLabel(Operand label)
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{
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_labels.Add(label, _stream.Position);
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}
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public void Add(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Add);
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}
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public void Addsd(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Addsd);
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}
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public void Addss(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Addss);
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}
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public void And(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.And);
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}
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public void Bsr(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Bsr);
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}
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public void Bswap(Operand dest)
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{
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WriteInstruction(dest, default, dest.Type, X86Instruction.Bswap);
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}
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public void Call(Operand dest)
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{
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WriteInstruction(dest, default, OperandType.None, X86Instruction.Call);
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}
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public void Cdq()
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{
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WriteByte(0x99);
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}
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public void Cmovcc(Operand dest, Operand source, OperandType type, X86Condition condition)
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{
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ref readonly InstructionInfo info = ref _instTable[(int)X86Instruction.Cmovcc];
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WriteOpCode(dest, default, source, type, info.Flags, info.OpRRM | (int)condition, rrm: true);
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}
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public void Cmp(Operand src1, Operand src2, OperandType type)
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{
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WriteInstruction(src1, src2, type, X86Instruction.Cmp);
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}
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public void Cqo()
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{
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WriteByte(0x48);
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WriteByte(0x99);
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}
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public void Cmpxchg(Operand memOp, Operand src)
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{
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Debug.Assert(memOp.Kind == OperandKind.Memory);
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WriteByte(LockPrefix);
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WriteInstruction(memOp, src, src.Type, X86Instruction.Cmpxchg);
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}
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public void Cmpxchg16(Operand memOp, Operand src)
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{
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Debug.Assert(memOp.Kind == OperandKind.Memory);
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WriteByte(LockPrefix);
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WriteByte(0x66);
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WriteInstruction(memOp, src, src.Type, X86Instruction.Cmpxchg);
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}
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public void Cmpxchg16b(Operand memOp)
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{
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Debug.Assert(memOp.Kind == OperandKind.Memory);
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WriteByte(LockPrefix);
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WriteInstruction(memOp, default, OperandType.None, X86Instruction.Cmpxchg16b);
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}
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public void Cmpxchg8(Operand memOp, Operand src)
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{
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Debug.Assert(memOp.Kind == OperandKind.Memory);
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WriteByte(LockPrefix);
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WriteInstruction(memOp, src, src.Type, X86Instruction.Cmpxchg8);
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}
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public void Comisd(Operand src1, Operand src2)
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{
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WriteInstruction(src1, default, src2, X86Instruction.Comisd);
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}
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public void Comiss(Operand src1, Operand src2)
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{
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WriteInstruction(src1, default, src2, X86Instruction.Comiss);
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}
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public void Cvtsd2ss(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Cvtsd2ss);
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}
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public void Cvtsi2sd(Operand dest, Operand src1, Operand src2, OperandType type)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Cvtsi2sd, type);
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}
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public void Cvtsi2ss(Operand dest, Operand src1, Operand src2, OperandType type)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Cvtsi2ss, type);
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}
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public void Cvtss2sd(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Cvtss2sd);
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}
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public void Div(Operand source)
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{
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WriteInstruction(default, source, source.Type, X86Instruction.Div);
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}
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public void Divsd(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Divsd);
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}
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public void Divss(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Divss);
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}
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public void Idiv(Operand source)
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{
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WriteInstruction(default, source, source.Type, X86Instruction.Idiv);
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}
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public void Imul(Operand source)
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{
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WriteInstruction(default, source, source.Type, X86Instruction.Imul128);
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}
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public void Imul(Operand dest, Operand source, OperandType type)
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{
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if (source.Kind != OperandKind.Register)
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{
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throw new ArgumentException($"Invalid source operand kind \"{source.Kind}\".");
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}
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WriteInstruction(dest, source, type, X86Instruction.Imul);
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}
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public void Imul(Operand dest, Operand src1, Operand src2, OperandType type)
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{
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ref readonly InstructionInfo info = ref _instTable[(int)X86Instruction.Imul];
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if (src2.Kind != OperandKind.Constant)
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{
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throw new ArgumentException($"Invalid source 2 operand kind \"{src2.Kind}\".");
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}
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if (IsImm8(src2.Value, src2.Type) && info.OpRMImm8 != BadOp)
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{
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WriteOpCode(dest, default, src1, type, info.Flags, info.OpRMImm8, rrm: true);
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WriteByte(src2.AsByte());
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}
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else if (IsImm32(src2.Value, src2.Type) && info.OpRMImm32 != BadOp)
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{
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WriteOpCode(dest, default, src1, type, info.Flags, info.OpRMImm32, rrm: true);
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WriteInt32(src2.AsInt32());
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}
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else
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{
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throw new ArgumentException($"Failed to encode constant 0x{src2.Value:X}.");
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}
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}
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public void Insertps(Operand dest, Operand src1, Operand src2, byte imm)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Insertps);
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WriteByte(imm);
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}
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public void Jcc(X86Condition condition, Operand dest)
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{
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if (dest.Kind == OperandKind.Label)
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{
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_jumps.Add(new Jump(condition, dest, _stream.Position));
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// ReservedBytesForJump
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WriteByte(0);
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}
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else
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{
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throw new ArgumentException("Destination operand must be of kind Label", nameof(dest));
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}
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}
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public void Jcc(X86Condition condition, long offset)
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{
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if (ConstFitsOnS8(offset))
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{
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WriteByte((byte)(0x70 | (int)condition));
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WriteByte((byte)offset);
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}
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else if (ConstFitsOnS32(offset))
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{
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WriteByte(0x0f);
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WriteByte((byte)(0x80 | (int)condition));
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WriteInt32((int)offset);
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}
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else
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{
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throw new ArgumentOutOfRangeException(nameof(offset));
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}
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}
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public void Jmp(long offset)
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{
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if (ConstFitsOnS8(offset))
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{
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WriteByte(0xeb);
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WriteByte((byte)offset);
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}
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else if (ConstFitsOnS32(offset))
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{
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WriteByte(0xe9);
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WriteInt32((int)offset);
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}
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else
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{
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throw new ArgumentOutOfRangeException(nameof(offset));
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}
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}
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public void Jmp(Operand dest)
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{
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if (dest.Kind == OperandKind.Label)
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{
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_jumps.Add(new Jump(dest, _stream.Position));
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// ReservedBytesForJump
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WriteByte(0);
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}
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else
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{
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WriteInstruction(dest, default, OperandType.None, X86Instruction.Jmp);
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}
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}
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public void Ldmxcsr(Operand dest)
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{
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WriteInstruction(dest, default, OperandType.I32, X86Instruction.Ldmxcsr);
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}
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public void Lea(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Lea);
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}
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public void LockOr(Operand dest, Operand source, OperandType type)
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{
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WriteByte(LockPrefix);
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WriteInstruction(dest, source, type, X86Instruction.Or);
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}
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public void Mov(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Mov);
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}
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public void Mov16(Operand dest, Operand source)
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{
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WriteInstruction(dest, source, OperandType.None, X86Instruction.Mov16);
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}
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public void Mov8(Operand dest, Operand source)
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{
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WriteInstruction(dest, source, OperandType.None, X86Instruction.Mov8);
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}
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public void Movd(Operand dest, Operand source)
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{
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ref readonly InstructionInfo info = ref _instTable[(int)X86Instruction.Movd];
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if (source.Type.IsInteger() || source.Kind == OperandKind.Memory)
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{
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WriteOpCode(dest, default, source, OperandType.None, info.Flags, info.OpRRM, rrm: true);
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}
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else
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{
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WriteOpCode(dest, default, source, OperandType.None, info.Flags, info.OpRMR);
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}
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}
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public void Movdqu(Operand dest, Operand source)
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{
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WriteInstruction(dest, default, source, X86Instruction.Movdqu);
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}
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public void Movhlps(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Movhlps);
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}
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public void Movlhps(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Movlhps);
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}
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public void Movq(Operand dest, Operand source)
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{
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ref readonly InstructionInfo info = ref _instTable[(int)X86Instruction.Movd];
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InstructionFlags flags = info.Flags | InstructionFlags.RexW;
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if (source.Type.IsInteger() || source.Kind == OperandKind.Memory)
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{
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WriteOpCode(dest, default, source, OperandType.None, flags, info.OpRRM, rrm: true);
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}
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else if (dest.Type.IsInteger() || dest.Kind == OperandKind.Memory)
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{
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WriteOpCode(dest, default, source, OperandType.None, flags, info.OpRMR);
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}
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else
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{
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WriteInstruction(dest, source, OperandType.None, X86Instruction.Movq);
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}
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}
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public void Movsd(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Movsd);
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}
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public void Movss(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Movss);
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}
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public void Movsx16(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Movsx16);
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}
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public void Movsx32(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Movsx32);
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}
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public void Movsx8(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Movsx8);
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}
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public void Movzx16(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Movzx16);
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}
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public void Movzx8(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Movzx8);
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}
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public void Mul(Operand source)
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{
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WriteInstruction(default, source, source.Type, X86Instruction.Mul128);
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}
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public void Mulsd(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Mulsd);
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}
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public void Mulss(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Mulss);
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}
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public void Neg(Operand dest)
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{
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WriteInstruction(dest, default, dest.Type, X86Instruction.Neg);
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}
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public void Not(Operand dest)
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{
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WriteInstruction(dest, default, dest.Type, X86Instruction.Not);
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}
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public void Or(Operand dest, Operand source, OperandType type)
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{
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WriteInstruction(dest, source, type, X86Instruction.Or);
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}
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public void Pclmulqdq(Operand dest, Operand source, byte imm)
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{
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WriteInstruction(dest, default, source, X86Instruction.Pclmulqdq);
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WriteByte(imm);
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}
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public void Pcmpeqw(Operand dest, Operand src1, Operand src2)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Pcmpeqw);
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}
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public void Pextrb(Operand dest, Operand source, byte imm)
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{
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WriteInstruction(dest, default, source, X86Instruction.Pextrb);
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WriteByte(imm);
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}
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public void Pextrd(Operand dest, Operand source, byte imm)
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{
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WriteInstruction(dest, default, source, X86Instruction.Pextrd);
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WriteByte(imm);
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}
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public void Pextrq(Operand dest, Operand source, byte imm)
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{
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WriteInstruction(dest, default, source, X86Instruction.Pextrq);
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WriteByte(imm);
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}
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public void Pextrw(Operand dest, Operand source, byte imm)
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{
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WriteInstruction(dest, default, source, X86Instruction.Pextrw);
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WriteByte(imm);
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}
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public void Pinsrb(Operand dest, Operand src1, Operand src2, byte imm)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Pinsrb);
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WriteByte(imm);
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}
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public void Pinsrd(Operand dest, Operand src1, Operand src2, byte imm)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Pinsrd);
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WriteByte(imm);
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}
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public void Pinsrq(Operand dest, Operand src1, Operand src2, byte imm)
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{
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WriteInstruction(dest, src1, src2, X86Instruction.Pinsrq);
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WriteByte(imm);
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}
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public void Pinsrw(Operand dest, Operand src1, Operand src2, byte imm)
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|
{
|
|
WriteInstruction(dest, src1, src2, X86Instruction.Pinsrw);
|
|
|
|
WriteByte(imm);
|
|
}
|
|
|
|
public void Pop(Operand dest)
|
|
{
|
|
if (dest.Kind == OperandKind.Register)
|
|
{
|
|
WriteCompactInst(dest, 0x58);
|
|
}
|
|
else
|
|
{
|
|
WriteInstruction(dest, default, dest.Type, X86Instruction.Pop);
|
|
}
|
|
}
|
|
|
|
public void Popcnt(Operand dest, Operand source, OperandType type)
|
|
{
|
|
WriteInstruction(dest, source, type, X86Instruction.Popcnt);
|
|
}
|
|
|
|
public void Pshufd(Operand dest, Operand source, byte imm)
|
|
{
|
|
WriteInstruction(dest, default, source, X86Instruction.Pshufd);
|
|
|
|
WriteByte(imm);
|
|
}
|
|
|
|
public void Push(Operand source)
|
|
{
|
|
if (source.Kind == OperandKind.Register)
|
|
{
|
|
WriteCompactInst(source, 0x50);
|
|
}
|
|
else
|
|
{
|
|
WriteInstruction(default, source, source.Type, X86Instruction.Push);
|
|
}
|
|
}
|
|
|
|
public void Return()
|
|
{
|
|
WriteByte(0xc3);
|
|
}
|
|
|
|
public void Ror(Operand dest, Operand source, OperandType type)
|
|
{
|
|
WriteShiftInst(dest, source, type, X86Instruction.Ror);
|
|
}
|
|
|
|
public void Sar(Operand dest, Operand source, OperandType type)
|
|
{
|
|
WriteShiftInst(dest, source, type, X86Instruction.Sar);
|
|
}
|
|
|
|
public void Shl(Operand dest, Operand source, OperandType type)
|
|
{
|
|
WriteShiftInst(dest, source, type, X86Instruction.Shl);
|
|
}
|
|
|
|
public void Shr(Operand dest, Operand source, OperandType type)
|
|
{
|
|
WriteShiftInst(dest, source, type, X86Instruction.Shr);
|
|
}
|
|
|
|
public void Setcc(Operand dest, X86Condition condition)
|
|
{
|
|
ref readonly InstructionInfo info = ref _instTable[(int)X86Instruction.Setcc];
|
|
|
|
WriteOpCode(dest, default, default, OperandType.None, info.Flags, info.OpRRM | (int)condition);
|
|
}
|
|
|
|
public void Stmxcsr(Operand dest)
|
|
{
|
|
WriteInstruction(dest, default, OperandType.I32, X86Instruction.Stmxcsr);
|
|
}
|
|
|
|
public void Sub(Operand dest, Operand source, OperandType type)
|
|
{
|
|
WriteInstruction(dest, source, type, X86Instruction.Sub);
|
|
}
|
|
|
|
public void Subsd(Operand dest, Operand src1, Operand src2)
|
|
{
|
|
WriteInstruction(dest, src1, src2, X86Instruction.Subsd);
|
|
}
|
|
|
|
public void Subss(Operand dest, Operand src1, Operand src2)
|
|
{
|
|
WriteInstruction(dest, src1, src2, X86Instruction.Subss);
|
|
}
|
|
|
|
public void Test(Operand src1, Operand src2, OperandType type)
|
|
{
|
|
WriteInstruction(src1, src2, type, X86Instruction.Test);
|
|
}
|
|
|
|
public void Xor(Operand dest, Operand source, OperandType type)
|
|
{
|
|
WriteInstruction(dest, source, type, X86Instruction.Xor);
|
|
}
|
|
|
|
public void Xorps(Operand dest, Operand src1, Operand src2)
|
|
{
|
|
WriteInstruction(dest, src1, src2, X86Instruction.Xorps);
|
|
}
|
|
|
|
public void WriteInstruction(
|
|
X86Instruction inst,
|
|
Operand dest,
|
|
Operand source,
|
|
OperandType type = OperandType.None)
|
|
{
|
|
WriteInstruction(dest, default, source, inst, type);
|
|
}
|
|
|
|
public void WriteInstruction(X86Instruction inst, Operand dest, Operand src1, Operand src2)
|
|
{
|
|
if (src2.Kind == OperandKind.Constant)
|
|
{
|
|
WriteInstruction(src1, dest, src2, inst);
|
|
}
|
|
else
|
|
{
|
|
WriteInstruction(dest, src1, src2, inst);
|
|
}
|
|
}
|
|
|
|
public void WriteInstruction(
|
|
X86Instruction inst,
|
|
Operand dest,
|
|
Operand src1,
|
|
Operand src2,
|
|
OperandType type)
|
|
{
|
|
WriteInstruction(dest, src1, src2, inst, type);
|
|
}
|
|
|
|
public void WriteInstruction(X86Instruction inst, Operand dest, Operand source, byte imm)
|
|
{
|
|
WriteInstruction(dest, default, source, inst);
|
|
|
|
WriteByte(imm);
|
|
}
|
|
|
|
public void WriteInstruction(
|
|
X86Instruction inst,
|
|
Operand dest,
|
|
Operand src1,
|
|
Operand src2,
|
|
Operand src3)
|
|
{
|
|
// 3+ operands can only be encoded with the VEX encoding scheme.
|
|
Debug.Assert(HardwareCapabilities.SupportsVexEncoding);
|
|
|
|
WriteInstruction(dest, src1, src2, inst);
|
|
|
|
WriteByte((byte)(src3.AsByte() << 4));
|
|
}
|
|
|
|
public void WriteInstruction(
|
|
X86Instruction inst,
|
|
Operand dest,
|
|
Operand src1,
|
|
Operand src2,
|
|
byte imm)
|
|
{
|
|
WriteInstruction(dest, src1, src2, inst);
|
|
|
|
WriteByte(imm);
|
|
}
|
|
|
|
private void WriteShiftInst(Operand dest, Operand source, OperandType type, X86Instruction inst)
|
|
{
|
|
if (source.Kind == OperandKind.Register)
|
|
{
|
|
X86Register shiftReg = (X86Register)source.GetRegister().Index;
|
|
|
|
Debug.Assert(shiftReg == X86Register.Rcx, $"Invalid shift register \"{shiftReg}\".");
|
|
|
|
source = default;
|
|
}
|
|
else if (source.Kind == OperandKind.Constant)
|
|
{
|
|
source = Operand.Factory.Const((int)source.Value & (dest.Type == OperandType.I32 ? 0x1f : 0x3f));
|
|
}
|
|
|
|
WriteInstruction(dest, source, type, inst);
|
|
}
|
|
|
|
private void WriteInstruction(Operand dest, Operand source, OperandType type, X86Instruction inst)
|
|
{
|
|
ref readonly InstructionInfo info = ref _instTable[(int)inst];
|
|
|
|
if (source != default)
|
|
{
|
|
if (source.Kind == OperandKind.Constant)
|
|
{
|
|
ulong imm = source.Value;
|
|
|
|
if (inst == X86Instruction.Mov8)
|
|
{
|
|
WriteOpCode(dest, default, default, type, info.Flags, info.OpRMImm8);
|
|
|
|
WriteByte((byte)imm);
|
|
}
|
|
else if (inst == X86Instruction.Mov16)
|
|
{
|
|
WriteOpCode(dest, default, default, type, info.Flags, info.OpRMImm32);
|
|
|
|
WriteInt16((short)imm);
|
|
}
|
|
else if (IsImm8(imm, type) && info.OpRMImm8 != BadOp)
|
|
{
|
|
WriteOpCode(dest, default, default, type, info.Flags, info.OpRMImm8);
|
|
|
|
WriteByte((byte)imm);
|
|
}
|
|
else if (!source.Relocatable && IsImm32(imm, type) && info.OpRMImm32 != BadOp)
|
|
{
|
|
WriteOpCode(dest, default, default, type, info.Flags, info.OpRMImm32);
|
|
|
|
WriteInt32((int)imm);
|
|
}
|
|
else if (dest != default && dest.Kind == OperandKind.Register && info.OpRImm64 != BadOp)
|
|
{
|
|
int rexPrefix = GetRexPrefix(dest, source, type, rrm: false);
|
|
|
|
if (rexPrefix != 0)
|
|
{
|
|
WriteByte((byte)rexPrefix);
|
|
}
|
|
|
|
WriteByte((byte)(info.OpRImm64 + (dest.GetRegister().Index & 0b111)));
|
|
|
|
if (HasRelocs && source.Relocatable)
|
|
{
|
|
_relocs.Add(new Reloc
|
|
{
|
|
JumpIndex = _jumps.Count - 1,
|
|
Position = (int)_stream.Position,
|
|
Symbol = source.Symbol
|
|
});
|
|
}
|
|
|
|
WriteUInt64(imm);
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentException($"Failed to encode constant 0x{imm:X}.");
|
|
}
|
|
}
|
|
else if (source.Kind == OperandKind.Register && info.OpRMR != BadOp)
|
|
{
|
|
WriteOpCode(dest, default, source, type, info.Flags, info.OpRMR);
|
|
}
|
|
else if (info.OpRRM != BadOp)
|
|
{
|
|
WriteOpCode(dest, default, source, type, info.Flags, info.OpRRM, rrm: true);
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentException($"Invalid source operand kind \"{source.Kind}\".");
|
|
}
|
|
}
|
|
else if (info.OpRRM != BadOp)
|
|
{
|
|
WriteOpCode(dest, default, source, type, info.Flags, info.OpRRM, rrm: true);
|
|
}
|
|
else if (info.OpRMR != BadOp)
|
|
{
|
|
WriteOpCode(dest, default, source, type, info.Flags, info.OpRMR);
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentNullException(nameof(source));
|
|
}
|
|
}
|
|
|
|
private void WriteInstruction(
|
|
Operand dest,
|
|
Operand src1,
|
|
Operand src2,
|
|
X86Instruction inst,
|
|
OperandType type = OperandType.None)
|
|
{
|
|
ref readonly InstructionInfo info = ref _instTable[(int)inst];
|
|
|
|
if (src2 != default)
|
|
{
|
|
if (src2.Kind == OperandKind.Constant)
|
|
{
|
|
ulong imm = src2.Value;
|
|
|
|
if ((byte)imm == imm && info.OpRMImm8 != BadOp)
|
|
{
|
|
WriteOpCode(dest, src1, default, type, info.Flags, info.OpRMImm8);
|
|
|
|
WriteByte((byte)imm);
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentException($"Failed to encode constant 0x{imm:X}.");
|
|
}
|
|
}
|
|
else if (src2.Kind == OperandKind.Register && info.OpRMR != BadOp)
|
|
{
|
|
WriteOpCode(dest, src1, src2, type, info.Flags, info.OpRMR);
|
|
}
|
|
else if (info.OpRRM != BadOp)
|
|
{
|
|
WriteOpCode(dest, src1, src2, type, info.Flags, info.OpRRM, rrm: true);
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentException($"Invalid source operand kind \"{src2.Kind}\".");
|
|
}
|
|
}
|
|
else if (info.OpRRM != BadOp)
|
|
{
|
|
WriteOpCode(dest, src1, src2, type, info.Flags, info.OpRRM, rrm: true);
|
|
}
|
|
else if (info.OpRMR != BadOp)
|
|
{
|
|
WriteOpCode(dest, src1, src2, type, info.Flags, info.OpRMR);
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentNullException(nameof(src2));
|
|
}
|
|
}
|
|
|
|
private void WriteOpCode(
|
|
Operand dest,
|
|
Operand src1,
|
|
Operand src2,
|
|
OperandType type,
|
|
InstructionFlags flags,
|
|
int opCode,
|
|
bool rrm = false)
|
|
{
|
|
int rexPrefix = GetRexPrefix(dest, src2, type, rrm);
|
|
|
|
if ((flags & InstructionFlags.RexW) != 0)
|
|
{
|
|
rexPrefix |= RexWPrefix;
|
|
}
|
|
|
|
int modRM = (opCode >> OpModRMBits) << 3;
|
|
|
|
MemoryOperand memOp = default;
|
|
bool hasMemOp = false;
|
|
|
|
if (dest != default)
|
|
{
|
|
if (dest.Kind == OperandKind.Register)
|
|
{
|
|
int regIndex = dest.GetRegister().Index;
|
|
|
|
modRM |= (regIndex & 0b111) << (rrm ? 3 : 0);
|
|
|
|
if ((flags & InstructionFlags.Reg8Dest) != 0 && regIndex >= 4)
|
|
{
|
|
rexPrefix |= RexPrefix;
|
|
}
|
|
}
|
|
else if (dest.Kind == OperandKind.Memory)
|
|
{
|
|
memOp = dest.GetMemory();
|
|
hasMemOp = true;
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentException("Invalid destination operand kind \"" + dest.Kind + "\".");
|
|
}
|
|
}
|
|
|
|
if (src2 != default)
|
|
{
|
|
if (src2.Kind == OperandKind.Register)
|
|
{
|
|
int regIndex = src2.GetRegister().Index;
|
|
|
|
modRM |= (regIndex & 0b111) << (rrm ? 0 : 3);
|
|
|
|
if ((flags & InstructionFlags.Reg8Src) != 0 && regIndex >= 4)
|
|
{
|
|
rexPrefix |= RexPrefix;
|
|
}
|
|
}
|
|
else if (src2.Kind == OperandKind.Memory && !hasMemOp)
|
|
{
|
|
memOp = src2.GetMemory();
|
|
hasMemOp = true;
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentException("Invalid source operand kind \"" + src2.Kind + "\".");
|
|
}
|
|
}
|
|
|
|
bool needsSibByte = false;
|
|
bool needsDisplacement = false;
|
|
|
|
int sib = 0;
|
|
|
|
if (hasMemOp)
|
|
{
|
|
// Either source or destination is a memory operand.
|
|
Register baseReg = memOp.BaseAddress.GetRegister();
|
|
|
|
X86Register baseRegLow = (X86Register)(baseReg.Index & 0b111);
|
|
|
|
needsSibByte = memOp.Index != default || baseRegLow == X86Register.Rsp;
|
|
needsDisplacement = memOp.Displacement != 0 || baseRegLow == X86Register.Rbp;
|
|
|
|
if (needsDisplacement)
|
|
{
|
|
if (ConstFitsOnS8(memOp.Displacement))
|
|
{
|
|
modRM |= 0x40;
|
|
}
|
|
else /* if (ConstFitsOnS32(memOp.Displacement)) */
|
|
{
|
|
modRM |= 0x80;
|
|
}
|
|
}
|
|
|
|
if (baseReg.Index >= 8)
|
|
{
|
|
Debug.Assert((uint)baseReg.Index <= MaxRegNumber);
|
|
|
|
rexPrefix |= RexPrefix | (baseReg.Index >> 3);
|
|
}
|
|
|
|
if (needsSibByte)
|
|
{
|
|
sib = (int)baseRegLow;
|
|
|
|
if (memOp.Index != default)
|
|
{
|
|
int indexReg = memOp.Index.GetRegister().Index;
|
|
|
|
Debug.Assert(indexReg != (int)X86Register.Rsp, "Using RSP as index register on the memory operand is not allowed.");
|
|
|
|
if (indexReg >= 8)
|
|
{
|
|
Debug.Assert((uint)indexReg <= MaxRegNumber);
|
|
|
|
rexPrefix |= RexPrefix | (indexReg >> 3) << 1;
|
|
}
|
|
|
|
sib |= (indexReg & 0b111) << 3;
|
|
}
|
|
else
|
|
{
|
|
sib |= 0b100 << 3;
|
|
}
|
|
|
|
sib |= (int)memOp.Scale << 6;
|
|
|
|
modRM |= 0b100;
|
|
}
|
|
else
|
|
{
|
|
modRM |= (int)baseRegLow;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Source and destination are registers.
|
|
modRM |= 0xc0;
|
|
}
|
|
|
|
Debug.Assert(opCode != BadOp, "Invalid opcode value.");
|
|
|
|
if ((flags & InstructionFlags.Vex) != 0 && HardwareCapabilities.SupportsVexEncoding)
|
|
{
|
|
// In a vex encoding, only one prefix can be active at a time. The active prefix is encoded in the second byte using two bits.
|
|
|
|
int vexByte2 = (flags & InstructionFlags.PrefixMask) switch
|
|
{
|
|
InstructionFlags.Prefix66 => 1,
|
|
InstructionFlags.PrefixF3 => 2,
|
|
InstructionFlags.PrefixF2 => 3,
|
|
_ => 0
|
|
};
|
|
|
|
if (src1 != default)
|
|
{
|
|
vexByte2 |= (src1.GetRegister().Index ^ 0xf) << 3;
|
|
}
|
|
else
|
|
{
|
|
vexByte2 |= 0b1111 << 3;
|
|
}
|
|
|
|
ushort opCodeHigh = (ushort)(opCode >> 8);
|
|
|
|
if ((rexPrefix & 0b1011) == 0 && opCodeHigh == 0xf)
|
|
{
|
|
// Two-byte form.
|
|
WriteByte(0xc5);
|
|
|
|
vexByte2 |= (~rexPrefix & 4) << 5;
|
|
|
|
WriteByte((byte)vexByte2);
|
|
}
|
|
else
|
|
{
|
|
// Three-byte form.
|
|
WriteByte(0xc4);
|
|
|
|
int vexByte1 = (~rexPrefix & 7) << 5;
|
|
|
|
switch (opCodeHigh)
|
|
{
|
|
case 0xf: vexByte1 |= 1; break;
|
|
case 0xf38: vexByte1 |= 2; break;
|
|
case 0xf3a: vexByte1 |= 3; break;
|
|
|
|
default: Debug.Assert(false, $"Failed to VEX encode opcode 0x{opCode:X}."); break;
|
|
}
|
|
|
|
vexByte2 |= (rexPrefix & 8) << 4;
|
|
|
|
WriteByte((byte)vexByte1);
|
|
WriteByte((byte)vexByte2);
|
|
}
|
|
|
|
opCode &= 0xff;
|
|
}
|
|
else
|
|
{
|
|
if (flags.HasFlag(InstructionFlags.Prefix66))
|
|
{
|
|
WriteByte(0x66);
|
|
}
|
|
|
|
if (flags.HasFlag(InstructionFlags.PrefixF2))
|
|
{
|
|
WriteByte(0xf2);
|
|
}
|
|
|
|
if (flags.HasFlag(InstructionFlags.PrefixF3))
|
|
{
|
|
WriteByte(0xf3);
|
|
}
|
|
|
|
if (rexPrefix != 0)
|
|
{
|
|
WriteByte((byte)rexPrefix);
|
|
}
|
|
}
|
|
|
|
if (dest != default && (flags & InstructionFlags.RegOnly) != 0)
|
|
{
|
|
opCode += dest.GetRegister().Index & 7;
|
|
}
|
|
|
|
if ((opCode & 0xff0000) != 0)
|
|
{
|
|
WriteByte((byte)(opCode >> 16));
|
|
}
|
|
|
|
if ((opCode & 0xff00) != 0)
|
|
{
|
|
WriteByte((byte)(opCode >> 8));
|
|
}
|
|
|
|
WriteByte((byte)opCode);
|
|
|
|
if ((flags & InstructionFlags.RegOnly) == 0)
|
|
{
|
|
WriteByte((byte)modRM);
|
|
|
|
if (needsSibByte)
|
|
{
|
|
WriteByte((byte)sib);
|
|
}
|
|
|
|
if (needsDisplacement)
|
|
{
|
|
if (ConstFitsOnS8(memOp.Displacement))
|
|
{
|
|
WriteByte((byte)memOp.Displacement);
|
|
}
|
|
else /* if (ConstFitsOnS32(memOp.Displacement)) */
|
|
{
|
|
WriteInt32(memOp.Displacement);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private void WriteCompactInst(Operand operand, int opCode)
|
|
{
|
|
int regIndex = operand.GetRegister().Index;
|
|
|
|
if (regIndex >= 8)
|
|
{
|
|
WriteByte(0x41);
|
|
}
|
|
|
|
WriteByte((byte)(opCode + (regIndex & 0b111)));
|
|
}
|
|
|
|
private static int GetRexPrefix(Operand dest, Operand source, OperandType type, bool rrm)
|
|
{
|
|
int rexPrefix = 0;
|
|
|
|
if (Is64Bits(type))
|
|
{
|
|
rexPrefix = RexWPrefix;
|
|
}
|
|
|
|
void SetRegisterHighBit(Register reg, int bit)
|
|
{
|
|
if (reg.Index >= 8)
|
|
{
|
|
rexPrefix |= RexPrefix | (reg.Index >> 3) << bit;
|
|
}
|
|
}
|
|
|
|
if (dest != default && dest.Kind == OperandKind.Register)
|
|
{
|
|
SetRegisterHighBit(dest.GetRegister(), rrm ? 2 : 0);
|
|
}
|
|
|
|
if (source != default && source.Kind == OperandKind.Register)
|
|
{
|
|
SetRegisterHighBit(source.GetRegister(), rrm ? 0 : 2);
|
|
}
|
|
|
|
return rexPrefix;
|
|
}
|
|
|
|
public (byte[], RelocInfo) GetCode()
|
|
{
|
|
var jumps = CollectionsMarshal.AsSpan(_jumps);
|
|
var relocs = CollectionsMarshal.AsSpan(_relocs);
|
|
|
|
// Write jump relative offsets.
|
|
bool modified;
|
|
|
|
do
|
|
{
|
|
modified = false;
|
|
|
|
for (int i = 0; i < jumps.Length; i++)
|
|
{
|
|
ref Jump jump = ref jumps[i];
|
|
|
|
// If jump target not resolved yet, resolve it.
|
|
if (jump.JumpTarget == null)
|
|
{
|
|
jump.JumpTarget = _labels[jump.JumpLabel];
|
|
}
|
|
|
|
long jumpTarget = jump.JumpTarget.Value;
|
|
long offset = jumpTarget - jump.JumpPosition;
|
|
|
|
if (offset < 0)
|
|
{
|
|
for (int j = i - 1; j >= 0; j--)
|
|
{
|
|
ref Jump jump2 = ref jumps[j];
|
|
|
|
if (jump2.JumpPosition < jumpTarget)
|
|
{
|
|
break;
|
|
}
|
|
|
|
offset -= jump2.InstSize - ReservedBytesForJump;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (int j = i + 1; j < jumps.Length; j++)
|
|
{
|
|
ref Jump jump2 = ref jumps[j];
|
|
|
|
if (jump2.JumpPosition >= jumpTarget)
|
|
{
|
|
break;
|
|
}
|
|
|
|
offset += jump2.InstSize - ReservedBytesForJump;
|
|
}
|
|
|
|
offset -= ReservedBytesForJump;
|
|
}
|
|
|
|
if (jump.IsConditional)
|
|
{
|
|
jump.InstSize = GetJccLength(offset);
|
|
}
|
|
else
|
|
{
|
|
jump.InstSize = GetJmpLength(offset);
|
|
}
|
|
|
|
// The jump is relative to the next instruction, not the current one.
|
|
// Since we didn't know the next instruction address when calculating
|
|
// the offset (as the size of the current jump instruction was not known),
|
|
// we now need to compensate the offset with the jump instruction size.
|
|
// It's also worth noting that:
|
|
// - This is only needed for backward jumps.
|
|
// - The GetJmpLength and GetJccLength also compensates the offset
|
|
// internally when computing the jump instruction size.
|
|
if (offset < 0)
|
|
{
|
|
offset -= jump.InstSize;
|
|
}
|
|
|
|
if (jump.Offset != offset)
|
|
{
|
|
jump.Offset = offset;
|
|
|
|
modified = true;
|
|
}
|
|
}
|
|
}
|
|
while (modified);
|
|
|
|
// Write the code, ignoring the dummy bytes after jumps, into a new stream.
|
|
_stream.Seek(0, SeekOrigin.Begin);
|
|
|
|
using var codeStream = new MemoryStream();
|
|
var assembler = new Assembler(codeStream, HasRelocs);
|
|
|
|
bool hasRelocs = HasRelocs;
|
|
int relocIndex = 0;
|
|
int relocOffset = 0;
|
|
var relocEntries = hasRelocs
|
|
? new RelocEntry[relocs.Length]
|
|
: Array.Empty<RelocEntry>();
|
|
|
|
for (int i = 0; i < jumps.Length; i++)
|
|
{
|
|
ref Jump jump = ref jumps[i];
|
|
|
|
// If has relocations, calculate their new positions compensating for jumps.
|
|
if (hasRelocs)
|
|
{
|
|
relocOffset += jump.InstSize - ReservedBytesForJump;
|
|
|
|
for (; relocIndex < relocEntries.Length; relocIndex++)
|
|
{
|
|
ref Reloc reloc = ref relocs[relocIndex];
|
|
|
|
if (reloc.JumpIndex > i)
|
|
{
|
|
break;
|
|
}
|
|
|
|
relocEntries[relocIndex] = new RelocEntry(reloc.Position + relocOffset, reloc.Symbol);
|
|
}
|
|
}
|
|
|
|
Span<byte> buffer = new byte[jump.JumpPosition - _stream.Position];
|
|
|
|
_stream.Read(buffer);
|
|
_stream.Seek(ReservedBytesForJump, SeekOrigin.Current);
|
|
|
|
codeStream.Write(buffer);
|
|
|
|
if (jump.IsConditional)
|
|
{
|
|
assembler.Jcc(jump.Condition, jump.Offset);
|
|
}
|
|
else
|
|
{
|
|
assembler.Jmp(jump.Offset);
|
|
}
|
|
}
|
|
|
|
// Write remaining relocations. This case happens when there are no jumps assembled.
|
|
for (; relocIndex < relocEntries.Length; relocIndex++)
|
|
{
|
|
ref Reloc reloc = ref relocs[relocIndex];
|
|
|
|
relocEntries[relocIndex] = new RelocEntry(reloc.Position + relocOffset, reloc.Symbol);
|
|
}
|
|
|
|
_stream.CopyTo(codeStream);
|
|
|
|
var code = codeStream.ToArray();
|
|
var relocInfo = new RelocInfo(relocEntries);
|
|
|
|
return (code, relocInfo);
|
|
}
|
|
|
|
private static bool Is64Bits(OperandType type)
|
|
{
|
|
return type == OperandType.I64 || type == OperandType.FP64;
|
|
}
|
|
|
|
private static bool IsImm8(ulong immediate, OperandType type)
|
|
{
|
|
long value = type == OperandType.I32 ? (int)immediate : (long)immediate;
|
|
|
|
return ConstFitsOnS8(value);
|
|
}
|
|
|
|
private static bool IsImm32(ulong immediate, OperandType type)
|
|
{
|
|
long value = type == OperandType.I32 ? (int)immediate : (long)immediate;
|
|
|
|
return ConstFitsOnS32(value);
|
|
}
|
|
|
|
private static int GetJccLength(long offset)
|
|
{
|
|
if (ConstFitsOnS8(offset < 0 ? offset - 2 : offset))
|
|
{
|
|
return 2;
|
|
}
|
|
else if (ConstFitsOnS32(offset < 0 ? offset - 6 : offset))
|
|
{
|
|
return 6;
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentOutOfRangeException(nameof(offset));
|
|
}
|
|
}
|
|
|
|
private static int GetJmpLength(long offset)
|
|
{
|
|
if (ConstFitsOnS8(offset < 0 ? offset - 2 : offset))
|
|
{
|
|
return 2;
|
|
}
|
|
else if (ConstFitsOnS32(offset < 0 ? offset - 5 : offset))
|
|
{
|
|
return 5;
|
|
}
|
|
else
|
|
{
|
|
throw new ArgumentOutOfRangeException(nameof(offset));
|
|
}
|
|
}
|
|
|
|
private static bool ConstFitsOnS8(long value)
|
|
{
|
|
return value == (sbyte)value;
|
|
}
|
|
|
|
private static bool ConstFitsOnS32(long value)
|
|
{
|
|
return value == (int)value;
|
|
}
|
|
|
|
private void WriteInt16(short value)
|
|
{
|
|
WriteUInt16((ushort)value);
|
|
}
|
|
|
|
private void WriteInt32(int value)
|
|
{
|
|
WriteUInt32((uint)value);
|
|
}
|
|
|
|
private void WriteByte(byte value)
|
|
{
|
|
_stream.WriteByte(value);
|
|
}
|
|
|
|
private void WriteUInt16(ushort value)
|
|
{
|
|
_stream.WriteByte((byte)(value >> 0));
|
|
_stream.WriteByte((byte)(value >> 8));
|
|
}
|
|
|
|
private void WriteUInt32(uint value)
|
|
{
|
|
_stream.WriteByte((byte)(value >> 0));
|
|
_stream.WriteByte((byte)(value >> 8));
|
|
_stream.WriteByte((byte)(value >> 16));
|
|
_stream.WriteByte((byte)(value >> 24));
|
|
}
|
|
|
|
private void WriteUInt64(ulong value)
|
|
{
|
|
_stream.WriteByte((byte)(value >> 0));
|
|
_stream.WriteByte((byte)(value >> 8));
|
|
_stream.WriteByte((byte)(value >> 16));
|
|
_stream.WriteByte((byte)(value >> 24));
|
|
_stream.WriteByte((byte)(value >> 32));
|
|
_stream.WriteByte((byte)(value >> 40));
|
|
_stream.WriteByte((byte)(value >> 48));
|
|
_stream.WriteByte((byte)(value >> 56));
|
|
}
|
|
}
|
|
} |