Esempio n. 1
0
        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);
                }
            }
        }
Esempio n. 2
0
    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);
      }
    }