# [ CPU Emulator ] by Python
어셈블리어를 공부하다가 어셈블리어를 외부로부터 읽어서 txt파일로 출력하는 프로그램이다.
# 구현소스
import sys
readFile = open('homework_3.s', 'r')
writeFile = open('output.txt', 'w')
orig_stdout = sys.stdout
sys.stdout = writeFile
regi = {'%eax':0, '%ebx':0, '%ecx':0, '%edx':0, '%esi':0, '%edi':0,'%esp':0, '%ebp':0}
stack = []
def argToValue(arg):
if (arg[0] == '%'):
for k, v in regi.items():
if (k == arg):
return v
if (arg[0:3] == "$0x"):
return int(arg[1:],16)
return int(arg[1:],10)
def movFunc(arg):
regi[arg[1]] = argToValue(arg[0])
def subFunc(arg):
regi[arg[1]] -= argToValue(arg[0])
def addFunc(arg):
regi[arg[1]] += argToValue(arg[0])
def xorFunc(arg):
regi[arg[1]] = argToValue(arg[0]) ^ argToValue(arg[1])
def pushFunc(arg):
stack.append({argToValue('%esp'):argToValue(arg[0])})
regi['%esp'] -= 4
def popFunc(arg):
regi[arg[0]] = stack.pop().values()[0]
regi['%esp'] += 4
def nopFunc(arg):
pass
def retFunc(arg):
pass
operator = dict( mov = movFunc, sub = subFunc, add = addFunc, xor = xorFunc, push = pushFunc, pop = popFunc, nop = nopFunc, ret = retFunc)
while 1:
line = readFile.readline().replace(",","").split()
if not line:
break
print "=========input========="
print line
operator[line[0]](line[1:])
print "-------stack info------"
for x in stack[::-1]:
print x
print "-----register info-----"
for key, value in regi.items():
print key, value
readFile.close()
writeFile.close()
sys.stdout = orig_stdout
# 실행결과
-INPUT
mov $1000, %esp
push %ebp
mov %esp, %ebp
mov $0, %eax
mov $0x0, %ebx
xor %esi, %esi
xor %edi, %edi
xor %ecx, %ecx
mov %ecx, %edx
mov $0x100, %eax
mov %eax, %ebx
sub $0x10, %ebx
sub $10, %ebx
mov %ebx, %edx
push %edx
add %edx, %edx
push %edx
pop %ebx
xor $0x10, %ebx
mov $0x200, %edx
sub $0x20, %edx
add %edx, %edx
mov $10, %eax
sub %eax, %edx
push %edx
pop %ecx
nop
pop %ebp
ret
-OUTPUT
=========input=========
['mov', '$1000', '%esp']
-------stack info------
-----register info-----
%ebp 0
%eax 0
%edx 0
%edi 0
%esp 1000
%ebx 0
%esi 0
%ecx 0
=========input=========
['push', '%ebp']
-------stack info------
{1000: 0}
-----register info-----
%ebp 0
%eax 0
%edx 0
%edi 0
%esp 996
%ebx 0
%esi 0
%ecx 0
=========input=========
['mov', '%esp', '%ebp']
-------stack info------
{1000: 0}
-----register info-----
%ebp 996
%eax 0
%edx 0
%edi 0
%esp 996
%ebx 0
%esi 0
%ecx 0
=========input=========
['mov', '$0', '%eax']
-------stack info------
{1000: 0}
-----register info-----
%ebp 996
%eax 0
%edx 0
%edi 0
%esp 996
%ebx 0
%esi 0
%ecx 0
=========input=========
['mov', '$0x0', '%ebx']
-------stack info------
{1000: 0}
-----register info-----
%ebp 996
%eax 0
%edx 0
%edi 0
%esp 996
%ebx 0
%esi 0
%ecx 0
=========input=========
['xor', '%esi', '%esi']
-------stack info------
{1000: 0}
-----register info-----
%ebp 996
%eax 0
%edx 0
%edi 0
%esp 996
%ebx 0
%esi 0
%ecx 0
=========input=========
['xor', '%edi', '%edi']
-------stack info------
{1000: 0}
-----register info-----
%ebp 996
%eax 0
%edx 0
%edi 0
%esp 996
%ebx 0
%esi 0
%ecx 0
.........(생략)
cpu emulator.pyhomework_3.s
output.txt
