def SUB(register):
if not validate.validate_reg(register):
print "Invalid Register: %s" % register
exit(1)
a = int(registers.reg["A"], 16)
if register == "M":
b = extras.getPair('H', 'L')
if extras.chkMemory(b):
b = int(registers.reg[register], 16)
else:
print " Invalid Memory:", b
exit(1)
else:
b = int(registers.reg[register], 16)
t = a - b
a = int(extras.getLowerNibble(format(a, '0x')), 2)
b = int(extras.getLowerNibble(format(b, '0x')), 2)
if not validate.validate_data(t):
print "\n////-----UnderFlow Detected----////\n"
t = format(t, "02x")
t = set_flags.setCarry(t)
set_flags.setFlags(a, b, t, isAbnormalFlow=True)
tmp = {"A": t[1:]}
else:
t = format(t, "02x")
set_flags.setFlags(a, b, t)
tmp = {"A": t}
set_flags.setFlags(a, b, t)
registers.reg.update(tmp)
def JMP(addr):
if extras.chkLable(addr):
return registers.label[addr]
elif extras.chkMemory(addr):
return addr
else:
print 'pointing to invalid memory:', addr
exit(1)
def prnt(addr):
try:
if validate.validate_reg(addr):
print registers.reg[addr]
elif extras.chkMemory(addr):
print registers.memory[addr]
else:
print " Invalid Memory or Register!!"
except:
print "invalid command type help for list of commands!!"
def INR(register):
if validate.validate_reg(register):
if register == 'M':
a = extras.getPair('H', 'L')
if extras.chkMemory(a):
b = int(registers.memory[a], 16) + 1
if b > 255:
b = 0
registers.memory[a] = format(b, '0x')
else:
print "invalid memory:", a
exit(1)
else:
b = int(registers.reg[register], 16) + 1
if b > 255:
b = 0
registers.reg[register] = format(b, '0x')
def MOV(reg1, reg2):
if not validate.validate_reg(reg1):
print "Invalid Register: %s" % reg1
exit(1)
if not validate.validate_reg(reg2):
print "Invalid Register: %s" % reg2
exit(1)
if reg1 == 'M':
a = extras.getPair('H', 'L')
if extras.chkMemory(a):
registers.memory[a] = registers.reg[reg2]
else:
print " Invalid Memory:", a
elif reg2 == 'M':
a = extras.getPair('H', 'L')
registers.reg[reg1] = registers.memory[a]
else:
registers.reg[reg1] = registers.reg[reg2]
def LHLD(addr):
if extras.chkMemory(addr) and extras.chkMemory(str(int(addr) + 1)):
registers.reg['L'] = registers.memory[addr]
registers.reg['H'] = registers.memory[str(int(addr) + 1)]
else:
print "Pointing Invalid Memory:", addr