Examples with OpImm suite.assembler.Amd64.OpImm used on opensource projects

Example 1 with OpImm

use of suite.assembler.Amd64.OpImm in project suite by stupidsing.

the class Amd64Assemble method assembleShift.

private InsnCode assembleShift(Instruction instruction, int b, int num) {
    if (isRm.test(instruction.op0)) {
        Operand shift = instruction.op1;
        boolean isShiftImm;
        OpImm shiftImm;
        int b1;
        if (shift instanceof OpImm) {
            shiftImm = (OpImm) shift;
            isShiftImm = 1 <= shiftImm.imm;
            b1 = b + (isShiftImm ? 0 : 16);
        } else if (shift.size == 1 && shift instanceof OpReg && ((OpReg) shift).reg == 1) {
            // CL
            shiftImm = null;
            isShiftImm = false;
            b1 = b + 16 + 2;
        } else
            return invalid;
        InsnCode insnCode = assembleByteFlag(instruction.op0, b1, num);
        if (shiftImm != null && !isShiftImm) {
            insnCode.immSize = 1;
            insnCode.imm = shiftImm.imm;
        }
        return insnCode;
    } else
        return invalid;
}

Example 2 with OpImm

use of suite.assembler.Amd64.OpImm in project suite by stupidsing.

the class Amd64Assemble method assembleInOut.

private InsnCode assembleInOut(Operand port, Operand acc, int b) {
    if (isAcc.test(acc)) {
        OpImm portImm;
        if (port instanceof OpImm)
            portImm = (OpImm) port;
        else if (// DX
        port.size == 2 && port instanceof OpReg && ((OpReg) port).reg == 2)
            portImm = null;
        else
            return invalid;
        InsnCode insnCode = new InsnCode(acc.size, bs(b + (acc.size == 1 ? 0 : 1) + (portImm != null ? 0 : 8)));
        if (portImm != null) {
            insnCode.immSize = 1;
            insnCode.imm = portImm.imm;
        }
        return insnCode;
    } else
        return invalid;
}

Example 3 with OpImm

use of suite.assembler.Amd64.OpImm in project suite by stupidsing.

the class Amd64Dump method dump.

private String dump(Operand op0) {
    int pointerSize = 4;
    OpReg[] regs;
    String name;
    if (pointerSize == 4)
        regs = amd64.reg32;
    else if (pointerSize == 8)
        regs = amd64.reg64;
    else
        return Fail.t();
    if (op0 instanceof OpImm) {
        OpImm opImm = (OpImm) op0;
        return dump(opImm.imm, opImm.size);
    } else if (op0 instanceof OpMem) {
        OpMem opMem = (OpMem) op0;
        int baseReg = opMem.baseReg;
        int indexReg = opMem.indexReg;
        String s = // 
        "" + // 
        (0 <= baseReg ? " + " + dump(regs[baseReg]) : "") + // 
        (0 <= indexReg ? " + " + dump(regs[indexReg]) + " * " + (1 << opMem.scale) : "") + (0 < opMem.dispSize ? dumpDisp(opMem.disp, pointerSize) : "");
        return "[" + s.substring(3) + "]";
    } else if ((name = (amd64.registerByName.inverse().get(op0).name)) != null)
        return name;
    else
        return op0.toString();
}

Example 4 with OpImm

use of suite.assembler.Amd64.OpImm in project suite by stupidsing.

the class Amd64Interpret method interpret.

public int interpret(List<Instruction> instructions, Bytes code, Bytes input) {
    mem.position(positionCode0);
    mem.put(code.bs);
    eip = positionCode0;
    regs[esp] = baseStackx - 16;
    IntIntMap labels = new IntIntMap();
    for (int i = 0; i < instructions.size(); i++) {
        int i_ = i;
        Instruction instruction = instructions.get(i_);
        if (instruction.insn == Insn.LABEL)
            labels.update((int) ((OpImm) instruction.op0).imm, i0 -> i_ + 1);
    }
    while (true) {
        Instruction instruction = instructions.get(eip++);
        if (Boolean.FALSE)
            LogUtil.info(state(instruction));
        try {
            Operand op0 = instruction.op0;
            Operand op1 = instruction.op1;
            int source0, source1;
            IntSink assign;
            if (op0 instanceof OpImm) {
                source0 = (int) ((OpImm) op0).imm;
                assign = null;
            } else if (op0 instanceof OpMem) {
                int index = index(address((OpMem) op0));
                source0 = mem.getInt(index);
                assign = i -> mem.putInt(index, i);
            } else if (op0 instanceof OpReg) {
                int reg = ((OpReg) op0).reg;
                source0 = regs[reg];
                assign = i -> {
                    regs[reg] = i;
                };
            } else {
                source0 = 0;
                assign = null;
            }
            if (op1 instanceof OpImm)
                source1 = (int) ((OpImm) op1).imm;
            else if (op1 instanceof OpMem)
                source1 = mem.getInt(index(address((OpMem) op1)));
            else if (op1 instanceof OpReg)
                source1 = regs[((OpReg) op1).reg];
            else
                source1 = 0;
            switch(instruction.insn) {
                case ADD:
                    assign.sink(source0 + source1);
                    break;
                case CALL:
                    push(eip);
                    eip = labels.get(source0);
                    break;
                case CMP:
                    c = Integer.compare(source0, source1);
                    break;
                case DEC:
                    assign.sink(source0 - 1);
                    break;
                case INC:
                    assign.sink(source0 + 1);
                    break;
                case INT:
                    if (source0 == -128)
                        if (regs[eax] == 1)
                            return regs[ebx];
                        else if (regs[eax] == 3) {
                            int length = min(regs[edx], input.size());
                            int di = index(regs[ecx]);
                            for (int i = 0; i < length; i++) mem.put(di++, input.get(i));
                            input = input.range(length);
                            regs[eax] = length;
                        } else if (regs[eax] == 4) {
                            int length = regs[edx];
                            int si = index(regs[ecx]);
                            byte[] bs = new byte[length];
                            for (int i = 0; i < length; i++) bs[i] = mem.get(si++);
                            output.sink(Bytes.of(bs));
                        } else
                            Fail.t();
                    else
                        Fail.t();
                    break;
                case JE:
                    if (c == 0)
                        eip = labels.get(source0);
                    break;
                case JMP:
                    eip = labels.get(source0);
                    break;
                case JG:
                    if (0 < c)
                        eip = labels.get(source0);
                    break;
                case JGE:
                    if (0 <= c)
                        eip = labels.get(source0);
                    break;
                case JL:
                    if (c < 0)
                        eip = labels.get(source0);
                    break;
                case JLE:
                    if (c <= 0)
                        eip = labels.get(source0);
                    break;
                case JNE:
                    if (c != 0)
                        eip = labels.get(source0);
                    break;
                case LABEL:
                    break;
                case LEA:
                    assign.sink(address((OpMem) op1));
                    break;
                case MOV:
                    assign.sink(source1);
                    break;
                case POP:
                    assign.sink(pop());
                    break;
                case PUSH:
                    push(source0);
                    break;
                case RET:
                    eip = pop();
                    break;
                case SUB:
                    assign.sink(source0 - source1);
                    break;
                case XOR:
                    assign.sink(source0 ^ source1);
                    break;
                default:
                    Fail.t();
            }
        } catch (Exception ex) {
            LogUtil.info(state(instruction));
            throw ex;
        }
    }
}

Example 5 with OpImm

use of suite.assembler.Amd64.OpImm in project suite by stupidsing.

the class Amd64Assemble method assemble.

public Bytes assemble(long offset, Instruction instruction) {
    Encode encode;
    switch(instruction.insn) {
        case AAA:
            encode = assemble(instruction, 0x37);
            break;
        case ADC:
            encode = assembleRmRegImm(instruction, 0x10, 0x80, 2);
            break;
        case ADD:
            encode = assembleRmRegImm(instruction, 0x00, 0x80, 0);
            break;
        case ADDPS:
            encode = assembleRegRm(instruction.op0, instruction.op1, 0x58).pre(0x0F);
            break;
        case AND:
            encode = assembleRmRegImm(instruction, 0x20, 0x80, 4);
            break;
        case AOP:
            encode = assemble(instruction, 0x67);
            break;
        case CALL:
            if (instruction.op0 instanceof OpImm && instruction.op0.size == 4)
                encode = assembleJumpImm((OpImm) instruction.op0, offset, -1, bs(0xE8));
            else if (isRm.test(instruction.op0))
                encode = assemble(instruction.op0, 0xFF, 2);
            else
                encode = invalid;
            break;
        case CLD:
            encode = assemble(instruction, 0xFC);
            break;
        case CLI:
            encode = assemble(instruction, 0xFA);
            break;
        case CMP:
            encode = assembleRmRegImm(instruction, 0x38, 0x80, 7);
            break;
        case CMPXCHG:
            encode = assembleRegRm(instruction.op1, instruction.op0, 0xB0);
            break;
        case CPUID:
            encode = new InsnCode(4, bs(0x0F, 0xA2));
            break;
        case DEC:
            encode = assembleRm(instruction, 0x48, 0xFE, 1);
            break;
        case DIV:
            encode = assembleByteFlag(instruction.op0, 0xF6, 6);
            break;
        case HLT:
            encode = assemble(instruction, 0xF4);
            break;
        case IDIV:
            encode = assembleByteFlag(instruction.op0, 0xF6, 7);
            break;
        case IMM:
            if (instruction.op0 instanceof OpImm) {
                InsnCode insnCode_ = new InsnCode(0, (OpImm) instruction.op0);
                insnCode_.bs = new byte[] {};
                encode = insnCode_;
            } else
                encode = invalid;
            break;
        case IMUL:
            if (instruction.op1 instanceof OpNone)
                encode = assembleByteFlag(instruction.op0, 0xF6, 5);
            else if (instruction.op0.size == instruction.op1.size)
                if (instruction.op2 instanceof OpNone)
                    encode = assembleRegRm(instruction.op0, instruction.op1, 0xAF).pre(0x0F);
                else if (instruction.op2 instanceof OpImm) {
                    OpImm imm = (OpImm) instruction.op2;
                    if (imm.size <= 1)
                        encode = assembleRegRm(instruction.op0, instruction.op1, 0x6B).imm(imm);
                    else if (imm.size == instruction.op0.size)
                        encode = assembleRegRm(instruction.op0, instruction.op1, 0x69).imm(imm);
                    else
                        encode = invalid;
                } else
                    encode = invalid;
            else
                encode = invalid;
            break;
        case IN:
            encode = assembleInOut(instruction.op1, instruction.op0, 0xE4);
            break;
        case INC:
            encode = assembleRm(instruction, 0x40, 0xFE, 0);
            break;
        case INT:
            if (instruction.op0 instanceof OpImm) {
                long iv = ((OpImm) instruction.op0).imm;
                if (iv != 3)
                    encode = assemble(instruction, 0xCD).imm(iv, 1);
                else
                    encode = assemble(instruction, 0xCC);
            } else
                encode = invalid;
            break;
        case INTO:
            encode = assemble(instruction, 0xCE);
            break;
        case INVLPG:
            encode = assemble(instruction.op0, 0x01, 7).pre(0x0F);
            break;
        case IRET:
            encode = assemble(instruction, 0xCF);
            break;
        case JA:
            encode = assembleJump(instruction, offset, 0x77, bs(0x0F, 0x87));
            break;
        case JAE:
            encode = assembleJump(instruction, offset, 0x73, bs(0x0F, 0x83));
            break;
        case JB:
            encode = assembleJump(instruction, offset, 0x72, bs(0x0F, 0x82));
            break;
        case JBE:
            encode = assembleJump(instruction, offset, 0x76, bs(0x0F, 0x86));
            break;
        case JE:
            encode = assembleJump(instruction, offset, 0x74, bs(0x0F, 0x84));
            break;
        case JG:
            encode = assembleJump(instruction, offset, 0x7F, bs(0x0F, 0x8F));
            break;
        case JGE:
            encode = assembleJump(instruction, offset, 0x7D, bs(0x0F, 0x8D));
            break;
        case JL:
            encode = assembleJump(instruction, offset, 0x7C, bs(0x0F, 0x8C));
            break;
        case JLE:
            encode = assembleJump(instruction, offset, 0x7E, bs(0x0F, 0x8E));
            break;
        case JMP:
            if (isRm.test(instruction.op0) && instruction.op0.size == 4)
                encode = assemble(instruction.op0, 0xFF, 4);
            else
                encode = assembleJump(instruction, offset, 0xEB, bs(0xE9));
            break;
        case JNE:
            encode = assembleJump(instruction, offset, 0x75, bs(0x0F, 0x85));
            break;
        case JNO:
            encode = assembleJump(instruction, offset, 0x71, bs(0x0F, 0x81));
            break;
        case JNP:
            encode = assembleJump(instruction, offset, 0x7B, bs(0x0F, 0x8B));
            break;
        case JNS:
            encode = assembleJump(instruction, offset, 0x79, bs(0x0F, 0x89));
            break;
        case JNZ:
            encode = assembleJump(instruction, offset, 0x75, bs(0x0F, 0x85));
            break;
        case JO:
            encode = assembleJump(instruction, offset, 0x70, bs(0x0F, 0x80));
            break;
        case JP:
            encode = assembleJump(instruction, offset, 0x7A, bs(0x0F, 0x8A));
            break;
        case JS:
            encode = assembleJump(instruction, offset, 0x78, bs(0x0F, 0x88));
            break;
        case JZ:
            encode = assembleJump(instruction, offset, 0x74, bs(0x0F, 0x84));
            break;
        case LABEL:
            ((OpImm) instruction.op0).imm = offset;
            encode = new InsnCode(4, new byte[0]);
            break;
        case LEA:
            encode = assembleRegRm(instruction.op0, instruction.op1, 0x8D);
            break;
        case LOCK:
            encode = assemble(instruction, 0xF0);
            break;
        case LOOP:
            encode = assembleJump(instruction, offset, 0xE2, null);
            break;
        case LOOPE:
            encode = assembleJump(instruction, offset, 0xE1, null);
            break;
        case LOOPNE:
            encode = assembleJump(instruction, offset, 0xE0, null);
            break;
        case LOOPNZ:
            encode = assembleJump(instruction, offset, 0xE0, null);
            break;
        case LOOPZ:
            encode = assembleJump(instruction, offset, 0xE1, null);
            break;
        case LGDT:
            encode = assemble(instruction.op0, 0x01, 2).pre(0x0F);
            break;
        case LIDT:
            encode = assemble(instruction.op0, 0x01, 3).pre(0x0F);
            break;
        case LTR:
            encode = assemble(instruction.op0, 0x00, 3).pre(0x0F);
            break;
        case MOV:
            if (instruction.op0.size == instruction.op1.size)
                if (instruction.op1 instanceof OpImm) {
                    OpImm op1 = (OpImm) instruction.op1;
                    if (instruction.op0 instanceof OpReg) {
                        OpReg op0 = (OpReg) instruction.op0;
                        encode = new InsnCode(op1.size, op1).setByte(0xB0 + (op0.size <= 1 ? 0 : 8) + op0.reg);
                    } else if (isRm.test(instruction.op0))
                        encode = assembleByteFlag(instruction.op0, 0xC6, 0).imm(op1);
                    else
                        encode = invalid;
                } else if (instruction.op0 instanceof OpRegSegment) {
                    OpRegSegment regSegment = (OpRegSegment) instruction.op0;
                    encode = assemble(instruction.op1, 0x8E, regSegment.sreg);
                } else if (instruction.op1 instanceof OpRegSegment) {
                    OpRegSegment regSegment = (OpRegSegment) instruction.op1;
                    encode = assemble(instruction.op0, 0x8C, regSegment.sreg);
                } else if (// 
                instruction.op0.size == 4 && // 
                instruction.op0 instanceof OpReg && instruction.op1 instanceof OpRegControl) {
                    OpReg reg = (OpReg) instruction.op0;
                    OpRegControl regControl = (OpRegControl) instruction.op1;
                    encode = new InsnCode(4, new byte[] { (byte) 0x0F, (byte) 0x20, b(reg.reg, regControl.creg, 3) });
                } else if (// 
                instruction.op0.size == 4 && // 
                instruction.op0 instanceof OpRegControl && instruction.op1 instanceof OpReg) {
                    OpRegControl regControl = (OpRegControl) instruction.op0;
                    OpReg reg = (OpReg) instruction.op1;
                    encode = new InsnCode(4, new byte[] { (byte) 0x0F, (byte) 0x22, b(reg.reg, regControl.creg, 3) });
                } else if ((encode = assembleRmReg(instruction, 0x88)).isValid())
                    ;
                else
                    encode = invalid;
            else
                encode = invalid;
            break;
        case MOVAPS:
            encode = assembleRmReg(instruction, 0x29, 0x28, isXmm).size(4).pre(0x0F);
            break;
        case MOVD:
            encode = assembleRmReg(instruction, 0x7E, 0x6E, isXmm).size(4).pre(bs(0x66, 0x0F));
            break;
        case MOVQ:
            encode = assembleRmReg(instruction, 0x7E, 0x6E, isXmm).size(8).pre(bs(0x66, 0x0F));
            break;
        case MOVSB:
            encode = new InsnCode(1, bs(0xA4));
            break;
        case MOVSD:
            encode = new InsnCode(4, bs(0xA5));
            break;
        case MOVSW:
            encode = new InsnCode(2, bs(0xA5));
            break;
        case MOVSX:
            encode = assembleRegRmExtended(instruction, 0xBE).pre(0x0F);
            break;
        case MOVZX:
            encode = assembleRegRmExtended(instruction, 0xB6).pre(0x0F);
            break;
        case MUL:
            encode = assembleByteFlag(instruction.op0, 0xF6, 4);
            break;
        case MULPS:
            encode = assembleRegRm(instruction.op0, instruction.op1, 0x59).pre(0x0F);
            break;
        case NEG:
            encode = assembleByteFlag(instruction.op0, 0xF6, 3);
            break;
        case NOP:
            encode = assemble(instruction, 0x90);
            break;
        case NOT:
            encode = assembleByteFlag(instruction.op0, 0xF6, 2);
            break;
        case OR:
            encode = assembleRmRegImm(instruction, 0x08, 0x80, 1);
            break;
        case OUT:
            encode = assembleInOut(instruction.op0, instruction.op1, 0xE6);
            break;
        case POP:
            if (1 < instruction.op0.size)
                if (isRm.test(instruction.op0))
                    encode = assembleRm(instruction, 0x58, 0x8E, 0);
                else if (instruction.op0 instanceof OpRegSegment) {
                    OpRegSegment sreg = (OpRegSegment) instruction.op0;
                    switch(sreg.sreg) {
                        case // POP ES
                        0:
                            encode = assemble(instruction, 0x07);
                            break;
                        // case 1: // POP CS, no such thing
                        case // POP SS
                        2:
                            encode = assemble(instruction, 0x17);
                            break;
                        case // POP DS
                        3:
                            encode = assemble(instruction, 0x1F);
                            break;
                        case // POP FS
                        4:
                            encode = new InsnCode(sreg.size, bs(0x0F, 0xA1));
                            break;
                        case // POP GS
                        5:
                            encode = new InsnCode(sreg.size, bs(0x0F, 0xA9));
                            break;
                        default:
                            encode = invalid;
                    }
                } else
                    encode = invalid;
            else
                encode = invalid;
            break;
        case POPA:
            encode = assemble(instruction, 0x61);
            break;
        case POPF:
            encode = assemble(instruction, 0x9D);
            break;
        case PUSH:
            if (instruction.op0 instanceof OpImm) {
                int size = instruction.op0.size;
                encode = new InsnCode(size, (OpImm) instruction.op0).setByte(0x68 + (1 < size ? 0 : 2));
            } else if (1 < instruction.op0.size)
                if (isRm.test(instruction.op0))
                    encode = assembleRm(instruction, 0x50, 0xFE, 6);
                else if (instruction.op0 instanceof OpRegSegment) {
                    OpRegSegment sreg = (OpRegSegment) instruction.op0;
                    switch(sreg.sreg) {
                        case // PUSH ES
                        0:
                            encode = assemble(instruction, 0x06);
                            break;
                        case // PUSH CS
                        1:
                            encode = assemble(instruction, 0x0E);
                            break;
                        case // PUSH SS
                        2:
                            encode = assemble(instruction, 0x16);
                            break;
                        case // PUSH DS
                        3:
                            encode = assemble(instruction, 0x1E);
                            break;
                        case // PUSH FS
                        4:
                            encode = new InsnCode(sreg.size, bs(0x0F, 0xA0));
                            break;
                        case // PUSH GS
                        5:
                            encode = new InsnCode(sreg.size, bs(0x0F, 0xA8));
                            break;
                        default:
                            encode = invalid;
                    }
                } else
                    encode = invalid;
            else
                encode = invalid;
            break;
        case PUSHA:
            encode = assemble(instruction, 0x60);
            break;
        case PUSHF:
            encode = assemble(instruction, 0x9C);
            break;
        case RDMSR:
            encode = new InsnCode(4, bs(0x0F, 0x32));
            break;
        case REP:
            encode = assemble(instruction, 0xF3);
            break;
        case REPE:
            encode = assemble(instruction, 0xF3);
            break;
        case REPNE:
            encode = assemble(instruction, 0xF2);
            break;
        case RET:
            if (instruction.op0 instanceof OpNone)
                encode = assemble(instruction, 0xC3);
            else if (instruction.op0 instanceof OpImm && instruction.op0.size == 2)
                encode = new InsnCode(instruction.op0.size, (OpImm) instruction.op0).setByte(0xC2);
            else
                encode = invalid;
            break;
        case SAL:
            encode = assembleShift(instruction, 0xC0, 4);
            break;
        case SAR:
            encode = assembleShift(instruction, 0xC0, 7);
            break;
        case SBB:
            encode = assembleRmRegImm(instruction, 0x18, 0x80, 3);
            break;
        case SETA:
            encode = assemble(instruction.op0, 0x97, 0).pre(0x0F);
            break;
        case SETAE:
            encode = assemble(instruction.op0, 0x93, 0).pre(0x0F);
            break;
        case SETB:
            encode = assemble(instruction.op0, 0x92, 0).pre(0x0F);
            break;
        case SETBE:
            encode = assemble(instruction.op0, 0x96, 0).pre(0x0F);
            break;
        case SETE:
            encode = assemble(instruction.op0, 0x94, 0).pre(0x0F);
            break;
        case SETG:
            encode = assemble(instruction.op0, 0x9F, 0).pre(0x0F);
            break;
        case SETGE:
            encode = assemble(instruction.op0, 0x9D, 0).pre(0x0F);
            break;
        case SETL:
            encode = assemble(instruction.op0, 0x9C, 0).pre(0x0F);
            break;
        case SETLE:
            encode = assemble(instruction.op0, 0x9E, 0).pre(0x0F);
            break;
        case SETNE:
            encode = assemble(instruction.op0, 0x95, 0).pre(0x0F);
            break;
        case SHL:
            encode = assembleShift(instruction, 0xC0, 4);
            break;
        case SHR:
            encode = assembleShift(instruction, 0xC0, 5);
            break;
        case STI:
            encode = assemble(instruction, 0xFB);
            break;
        case STOSB:
            encode = new InsnCode(1, bs(0xAA));
            break;
        case STOSD:
            encode = new InsnCode(4, bs(0xAB));
            break;
        case STOSW:
            encode = new InsnCode(2, bs(0xAB));
            break;
        case SUB:
            encode = assembleRmRegImm(instruction, 0x28, 0x80, 5);
            break;
        case SUBPS:
            encode = assembleRegRm(instruction.op0, instruction.op1, 0x5C).pre(0x0F);
            break;
        case SYSENTER:
            encode = new InsnCode(4, bs(0x0F, 0x34));
            break;
        case SYSEXIT:
            encode = new InsnCode(4, bs(0x0F, 0x35));
            break;
        case TEST:
            if (instruction.op0.size == instruction.op1.size)
                if (instruction.op1 instanceof OpImm)
                    encode = assembleRmImm(instruction.op0, (OpImm) instruction.op1, 0xA8, 0xF6, 0);
                else
                    encode = assembleByteFlag(instruction.op0, 0x84, instruction.op1);
            else
                encode = invalid;
            break;
        case VADDPS:
            encode = assembleRegRm(instruction.op0, instruction.op2, 0x58).vex(Vexp.VP__, instruction.op1, Vexm.VM0F__);
            break;
        case VMOVAPS:
            encode = assembleRmReg(instruction, 0x29, 0x28, isXmmYmm).vex(Vexp.VP__, 0, Vexm.VM0F__);
            break;
        case VMOVD:
            encode = assembleRmReg(instruction, 0x7E, 0x6E, isXmm).size(4).vex(Vexp.VP66, 0, Vexm.VM0F__);
            break;
        case VMOVQ:
            encode = assembleRmReg(instruction, 0x7E, 0x6E, isXmm).size(8).vex(Vexp.VP66, 0, Vexm.VM0F__);
            break;
        case VMULPS:
            encode = assembleRegRm(instruction.op0, instruction.op2, 0x59).vex(Vexp.VP__, instruction.op1, Vexm.VM0F__);
            break;
        case VSUBPS:
            encode = assembleRegRm(instruction.op0, instruction.op2, 0x5C).vex(Vexp.VP__, instruction.op1, Vexm.VM0F__);
            break;
        case XCHG:
            if (instruction.op0.size == instruction.op1.size && instruction.op1 instanceof OpReg)
                if (isAcc.test(instruction.op0))
                    encode = assemble(instruction, 0x90 + ((OpReg) instruction.op1).reg);
                else
                    encode = assembleByteFlag(instruction.op0, 0x86, instruction.op1);
            else
                encode = invalid;
            break;
        case WRMSR:
            encode = new InsnCode(4, bs(0x0F, 0x30));
            break;
        case XOR:
            encode = assembleRmRegImm(instruction, 0x30, 0x80, 6);
            break;
        default:
            encode = invalid;
    }
    return encode.encode_();
}