def i_dec(self, op):
val = self.getOperValue(op, 0)
uval = e_bits.unsigned(val, op.opers[0].tsize)
if val == None:
self.undefFlags()
return
val -= 1
self.setOperValue(op, 0, val)
#FIXME change over to integer subtraction
self.setFlag(EFLAGS_OF, 0) #FIXME OF
self.setFlag(EFLAGS_SF, e_bits.is_signed(val, op.opers[0].tsize))
self.setFlag(EFLAGS_ZF, not val)
self.setFlag(EFLAGS_AF, e_bits.is_aux_carry_sub(1, uval))
self.setFlag(EFLAGS_PF, e_bits.is_parity_byte(val))
def i_dec(self, op):
val = self.getOperValue(op, 0)
uval = e_bits.unsigned(val, op.opers[0].tsize)
if val == None:
self.undefFlags()
return
val -= 1
self.setOperValue(op, 0, val)
#FIXME change over to integer subtraction
self.setFlag(EFLAGS_OF, 0) #FIXME OF
self.setFlag(EFLAGS_SF, e_bits.is_signed(val, op.opers[0].tsize))
self.setFlag(EFLAGS_ZF, not val)
self.setFlag(EFLAGS_AF, e_bits.is_aux_carry_sub(1, uval))
self.setFlag(EFLAGS_PF, e_bits.is_parity_byte(val))
def intSubBase(self, src, dst, ssize, dsize):
usrc = e_bits.unsigned(src, ssize)
udst = e_bits.unsigned(dst, dsize)
ssrc = e_bits.signed(src, ssize)
sdst = e_bits.signed(dst, dsize)
ures = udst - usrc
sres = sdst - ssrc
#print "dsize/ssize: %d %d" % (dsize, ssize)
#print "unsigned: %d %d %d" % (usrc, udst, ures)
#print "signed: %d %d %d" % (ssrc, sdst, sres)
self.setFlag(EFLAGS_OF, e_bits.is_signed_overflow(sres, dsize))
self.setFlag(EFLAGS_AF, e_bits.is_aux_carry_sub(usrc, udst))
self.setFlag(EFLAGS_CF, e_bits.is_unsigned_carry(ures, dsize))
self.setFlag(EFLAGS_SF, e_bits.is_signed(ures, dsize))
self.setFlag(EFLAGS_ZF, not sres)
self.setFlag(EFLAGS_PF, e_bits.is_parity_byte(ures))
return ures
def intSubBase(self, src, dst, ssize, dsize):
usrc = e_bits.unsigned(src, ssize)
udst = e_bits.unsigned(dst, dsize)
ssrc = e_bits.signed(src, ssize)
sdst = e_bits.signed(dst, dsize)
ures = udst - usrc
sres = sdst - ssrc
#print "dsize/ssize: %d %d" % (dsize, ssize)
#print "unsigned: %d %d %d" % (usrc, udst, ures)
#print "signed: %d %d %d" % (ssrc, sdst, sres)
self.setFlag(EFLAGS_OF, e_bits.is_signed_overflow(sres, dsize))
self.setFlag(EFLAGS_AF, e_bits.is_aux_carry_sub(usrc, udst))
self.setFlag(EFLAGS_CF, e_bits.is_unsigned_carry(ures, dsize))
self.setFlag(EFLAGS_SF, e_bits.is_signed(ures, dsize))
self.setFlag(EFLAGS_ZF, not sres)
self.setFlag(EFLAGS_PF, e_bits.is_parity_byte(ures))
return ures
