internal static FuzzerInstruction CreateInvalidLegacy(FuzzerOpCodeTable table, OpCode opCode, int groupIndex, bool isModrmMemory, MandatoryPrefix mandatoryPrefix) => new FuzzerInstruction(Code.INVALID, FuzzerInstructionFlags.None, 0, 0, mandatoryPrefix, table, opCode, groupIndex, -1, isModrmMemory, 0, 0);
internal static FuzzerInstruction CreateInvalidVec(FuzzerOpCodeTable table, OpCode opCode, int groupIndex, int rmGroupIndex, bool isModrmMemory, MandatoryPrefix mandatoryPrefix, uint w, uint l, FuzzerInstructionFlags flags) => new FuzzerInstruction(Code.INVALID, flags, w, l, mandatoryPrefix, table, opCode, groupIndex, rmGroupIndex, isModrmMemory, 0, 0);
FuzzerInstruction(Code code, FuzzerInstructionFlags flags, uint w, uint l, MandatoryPrefix mandatoryPrefix, FuzzerOpCodeTable table, OpCode opCode, int groupIndex, int rmGroupIndex, bool isModrmMemory, int operandSize, int addressSize)
{
// Should be a 2-byte opcode instead (groupIndex = modrm.reg and rmGroupIndex = modrm.rm bits)
Assert.True(groupIndex < 0 || rmGroupIndex < 0);
Assert.True(groupIndex >= -1 && groupIndex <= 7);
Assert.True(rmGroupIndex >= -1 && rmGroupIndex <= 7);
var opc = code.ToOpCode();
Assert.True(opc.IsInstruction || code == Code.INVALID);
if (isModrmMemory)
{
if (opc.CanBroadcast)
{
flags |= FuzzerInstructionFlags.CanBroadcast;
}
if (opc.CanUseLockPrefix)
{
flags |= FuzzerInstructionFlags.CanUseLockPrefix;
}
}
else
{
if (opc.CanUseRoundingControl)
{
flags |= FuzzerInstructionFlags.CanUseRoundingControl;
}
if (opc.CanSuppressAllExceptions)
{
flags |= FuzzerInstructionFlags.CanSuppressAllExceptions;
}
}
if (opc.RequireNonZeroOpMaskRegister)
{
flags |= FuzzerInstructionFlags.RequireNonZeroOpMaskRegister;
}
if (opc.CanUseZeroingMasking)
{
flags |= FuzzerInstructionFlags.CanUseZeroingMasking;
}
if (opc.CanUseOpMaskRegister)
{
flags |= FuzzerInstructionFlags.CanUseOpMaskRegister;
}
switch (code)
{
case Code.Xchg_r16_AX:
case Code.Xchg_r32_EAX:
case Code.Xchg_r64_RAX:
flags |= FuzzerInstructionFlags.IsXchgRegAcc;
break;
case Code.Nopw:
case Code.Nopd:
case Code.Nopq:
flags |= FuzzerInstructionFlags.IsNop;
break;
case Code.Rdrand_r16:
case Code.Rdrand_r32:
case Code.Rdrand_r64:
case Code.Rdseed_r16:
case Code.Rdseed_r32:
case Code.Rdseed_r64:
case Code.Movbe_r16_m16:
case Code.Movbe_r32_m32:
case Code.Movbe_r64_m64:
case Code.Movbe_m16_r16:
case Code.Movbe_m32_r32:
case Code.Movbe_m64_r64:
Assert.True(mandatoryPrefix == MandatoryPrefix.None);
mandatoryPrefix = MandatoryPrefix.PNP;
flags |= FuzzerInstructionFlags.IsNFx;
break;
}
Code = code;
Flags = flags;
W = w;
L = l;
MandatoryPrefix = mandatoryPrefix;
Table = table;
OpCode = opCode;
GroupIndex = groupIndex;
RmGroupIndex = rmGroupIndex;
IsModrmMemory = isModrmMemory;
OperandSize = operandSize;
AddressSize = addressSize;
if (MandatoryPrefix == MandatoryPrefix.P66 && operandSize != 64 && CodeUtils.IsReservedNop(Code))
{
MandatoryPrefix = MandatoryPrefix.None;
}
FuzzerOperand[]? operands = null;
// Special support for reserved nop instructions since we may have transformed them to
// a 2-byte opcode (no ops) or a reg or rm group (one operand).
if (CodeUtils.IsReservedNop(code))
{
// Verify our assumptions
Assert.True(opc.OpCount == 2);
const int RM_INDEX = 0;
const int REG_INDEX = 1;
switch (opc.GetOpKind(RM_INDEX))
{
case OpCodeOperandKind.r16_or_mem:
case OpCodeOperandKind.r32_or_mem:
case OpCodeOperandKind.r64_or_mem:
break;
default:
throw ThrowHelpers.Unreachable;
}
switch (opc.GetOpKind(REG_INDEX))
{
case OpCodeOperandKind.r16_reg:
case OpCodeOperandKind.r32_reg:
case OpCodeOperandKind.r64_reg:
break;
default:
throw ThrowHelpers.Unreachable;
}
if (OpCode.IsTwobyte)
{
Assert.True(groupIndex < 0 && rmGroupIndex < 0);
operands = Array.Empty <FuzzerOperand>();
}
else if (groupIndex >= 0)
{
Assert.True(rmGroupIndex < 0);
// reg bits are hard coded, rm bits can be used
operands = new FuzzerOperand[1] {
FuzzerOperands.GetOperand(opc.GetOpKind(RM_INDEX), isModrmMemory)
};
}
else if (rmGroupIndex >= 0)
{
// rm bits are hard coded, reg bits can be used
operands = new FuzzerOperand[1] {
FuzzerOperands.GetOperand(opc.GetOpKind(REG_INDEX), isModrmMemory)
};
}
}
if (operands is null)
{
int opCount = opc.OpCount + (opc.CanUseOpMaskRegister ? 1 : 0);
operands = opCount == 0 ? Array.Empty <FuzzerOperand>() : new FuzzerOperand[opCount];
int i;
for (i = 0; i < opc.OpCount; i++)
{
operands[i] = FuzzerOperands.GetOperand(opc.GetOpKind(i), isModrmMemory);
}
if (opc.CanUseOpMaskRegister)
{
operands[i++] = FuzzerOperands.OpMaskRegister;
}
Assert.True(i == operands.Length);
}
operands = operands.Where(a => a.Kind != FuzzerOperandKind.None).ToArray();
Operands = operands;
Assert.True(!opc.CanUseOpMaskRegister || (operands.Length > 0 && operands[operands.Length - 1] == FuzzerOperands.OpMaskRegister));
ImmediateOperands = operands.OfType <ImmediateFuzzerOperand>().ToArray();
MemOffsOperands = operands.Where(a => a.Kind == FuzzerOperandKind.MemOffs).ToArray();
ImpliedMemOperands = operands.Where(a => a.Kind == FuzzerOperandKind.ImpliedMem).ToArray();
ModrmMemoryOperands = operands.OfType <ModrmMemoryFuzzerOperand>().ToArray();
RegisterOperands = operands.OfType <RegisterFuzzerOperand>().ToArray();
// There are fuzzers that test only some of these op kinds, so if there's a new op kind, a new fuzzer would need
// to be added, see eg AllMemOffsFuzzerGen
Assert.True(Operands.Length == ImmediateOperands.Length + MemOffsOperands.Length + ImpliedMemOperands.Length + ModrmMemoryOperands.Length + RegisterOperands.Length);
foreach (var memOp in ModrmMemoryOperands)
{
if (memOp.IsVSIB)
{
Flags |= FuzzerInstructionFlags.IsVsib;
break;
}
}
}
