def _translate_bisz(self, oprnd1, oprnd2, oprnd3):
"""Return a formula representation of a BISZ instruction.
"""
assert oprnd1.size and oprnd3.size
op1_var = self._translate_src_oprnd(oprnd1)
op3_var, op3_var_constrs = self._translate_dst_oprnd(oprnd3)
result = smtfunction.ite(oprnd3.size, op1_var == 0x0,
smtsymbol.Constant(oprnd3.size, 0x1),
smtsymbol.Constant(oprnd3.size, 0x0))
return [op3_var == result] + op3_var_constrs
def _translate_src_oprnd(self, operand):
"""Translate source operand to a SMT expression.
"""
if isinstance(operand, ReilRegisterOperand):
return self._translate_src_register_oprnd(operand)
elif isinstance(operand, ReilImmediateOperand):
return smtsymbol.Constant(operand.size, operand.immediate)
else:
raise Exception("Invalid operand type")
def get_operand_expr(self, operand, mode="post"):
"""Return a smt bit vector that represents a register (architectural or
temporal).
"""
if isinstance(operand, ReilRegisterOperand):
if operand.name in self._arch_info.registers_all:
# Process architectural registers (eax, ebx, etc.)
expr = self.get_register_expr(operand.name, mode=mode)
else:
# Process temporal registers (t0, t1, etc.)
var_name = self._get_var_name(operand.name, mode)
expr = self._translator.make_bitvec(operand.size, var_name)
elif isinstance(operand, ReilImmediateOperand):
expr = smtsymbol.Constant(operand.size, operand.immediate)
else:
raise Exception("Invalid operand: %s" % str(operand))
return expr