public static unsafe DecomposedInstruction FromUnsafe(DecomposedInstructionStruct* srcInst)
{
var di = new DecomposedInstruction {
Address = srcInst->Address,
Flags = srcInst->Flags,
Size = srcInst->Size,
_segment = srcInst->segment,
Base = srcInst->ibase,
Scale = srcInst->scale,
Opcode = srcInst->Opcode,
UnusedPrefixesMask = srcInst->UnusedPrefixesMask,
Meta = srcInst->meta,
RegistersMask = srcInst->UsedRegistersMask,
ModifiedFlagsMask = srcInst->modifiedFlagsMask,
TestedFlagsMask = srcInst->testedFlagsMask,
UndefinedFlagsMask = srcInst->undefinedFlagsMask
};
/* Simple fields: */
/* Immediate variant. */
var immVariant = new ImmVariant {
ImmediateValue = srcInst->ImmediateValue,
Size = 0
};
/* The size of the immediate is in one of the operands, if at all. Look for it below. Zero by default. */
/* Count operands. */
var operandsNo = 0;
for (operandsNo = 0; operandsNo < DecomposedInstructionStruct.OPERANDS_NO; operandsNo++)
{
if (srcInst->Operands[operandsNo].Type == OperandType.None)
break;
}
var ops = new Operand[operandsNo];
for (var j = 0; j < operandsNo; j++)
{
var srcOp = srcInst->Operands[j];
if (srcOp.Type == OperandType.Immediate)
{
/* Set the size of the immediate operand. */
immVariant.Size = srcInst->Operands[j].Size;
}
var op = new Operand
{
Type = srcOp.Type,
Index = srcOp.index,
Size = srcOp.Size
};
ops[j] = op;
}
di.Operands = ops;
/* Attach the immediate variant. */
di.ImmediateValue = immVariant;
/* Displacement variant. */
var disp = new DispVariant
{
Displacement = srcInst->Displacement,
Size = srcInst->dispSize
};
di.Displacement = disp;
return di;
}
public static unsafe void Decompose(CodeInfo nci, DecomposedResult ndr)
{
_CodeInfo* ci = null;
_DInst* insts = null;
var gch = new GCHandle();
var usedInstructionsCount = 0;
try
{
if ((ci = AcquireCodeInfoStruct(nci, out gch)) == null)
throw new OutOfMemoryException();
var maxInstructions = ndr.MaxInstructions;
if ((insts = (_DInst*) Malloc(maxInstructions*sizeof (_DInst))) == null)
throw new OutOfMemoryException();
distorm_decompose64(ci, insts, maxInstructions, &usedInstructionsCount);
var dinsts = new DecomposedInst[usedInstructionsCount];
for (var i = 0; i < usedInstructionsCount; i++) {
var di = new DecomposedInst {
Address = insts[i].addr,
Flags = insts[i].flags,
Size = insts[i].size,
_segment = insts[i].segment,
Base = insts[i].ibase,
Scale = insts[i].scale,
Opcode = (Opcode) insts[i].opcode,
UnusedPrefixesMask = insts[i].unusedPrefixesMask,
Meta = insts[i].meta,
RegistersMask = insts[i].usedRegistersMask,
ModifiedFlagsMask = insts[i].modifiedFlagsMask,
TestedFlagsMask = insts[i].testedFlagsMask,
UndefinedFlagsMask = insts[i].undefinedFlagsMask
};
/* Simple fields: */
/* Immediate variant. */
var immVariant = new DecomposedInst.ImmVariant {
Imm = insts[i].imm.qword,
Size = 0
};
/* The size of the immediate is in one of the operands, if at all. Look for it below. Zero by default. */
/* Count operands. */
var operandsNo = 0;
for (operandsNo = 0; operandsNo < _DInst.OPERANDS_NO; operandsNo++)
{
if (insts[i].ops[operandsNo].type == OperandType.None)
break;
}
var ops = new Operand[operandsNo];
for (var j = 0; j < operandsNo; j++)
{
if (insts[i].ops[j].type == OperandType.Imm) {
/* Set the size of the immediate operand. */
immVariant.Size = insts[i].ops[j].size;
}
var op = new Operand {
Type = insts[i].ops[j].type,
Index = insts[i].ops[j].index,
Size = insts[i].ops[j].size
};
ops[j] = op;
}
di.Operands = ops;
/* Attach the immediate variant. */
di.Imm = immVariant;
/* Displacement variant. */
var disp = new DecomposedInst.DispVariant {
Displacement = insts[i].disp,
Size = insts[i].dispSize
};
di.Disp = disp;
dinsts[i] = di;
}
ndr.Instructions = dinsts;
}
finally
{
if (gch.IsAllocated)
gch.Free();
if (ci != null)
Free(ci);
if (insts != null)
Free(insts);
}
}
