Add support for xmmword ref during dissasm. (#124)

Co-authored-by: Nikolaos Totosis <n0t@spamhaus.com>

malduck/disasm.py

@@ -24,12 +24,7 @@ class Operand:
     _x86_op_mem = None
     regs: Dict[str, Union[str, int]] = {}
 
-    sizes = {
-        1: "byte",
-        2: "word",
-        4: "dword",
-        8: "qword",
-    }
+    sizes = {1: "byte", 2: "word", 4: "dword", 8: "qword", 16: "xmmword"}
 
     def __init__(self, op: X86Op, x64: bool) -> None:
         self.op = op

tests/test_disasm.py

@@ -21,6 +21,8 @@ class TestDisasm(object):
         b"\xe8\x00\x00\x00\x00",
         # movxz eax, byte [0x400000]
         b"\x0f\xb6\x05\x00\x00\x04\x00",
+        # movups xmmword ptr [esi+0Ch], xmm0
+        b"\x0f\x11\x46\x0c"
     ))
 
     def setup_method(self):
@@ -60,6 +62,10 @@ def test_insns(self):
         assert insn7.op2.reg is None
         assert insn7.op2 == (None, None, None, 0x400000)
 
+        insn8 = self.insns[7]
+        assert insn8.op2.reg == "xmm0"
+        assert insn8.op1.mem == ("xmmword", "esi", None, None, 0x0C)
+
     def test_equal(self):
         assert next(disasm(b"hAAAA", 0)).mnem == "push"
         assert next(disasm(b"hAAAA", 0)).op1.value == 0x41414141