Initial commit. Holy hell this code is terrible.
This commit is contained in:
commit
63175f36d0
5
README.md
Normal file
5
README.md
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
|
||||
# Infernal Interpreter & Devious Stack Painter #################################
|
||||
|
||||
A very simple interpreter and stack tracer for the AMD x86_64 ABI written in
|
||||
Python. Does not support all commands as of yet (or anytime).
|
||||
265
internal.py
Normal file
265
internal.py
Normal file
|
|
@ -0,0 +1,265 @@
|
|||
|
||||
import re
|
||||
import sys
|
||||
|
||||
REGISTERS=["%rip","%rbp","%rsp","","%rax","%rdi","%r8","%r9"]
|
||||
OPTIONS = """register_node/.style={rectangle, draw=black!30,
|
||||
fill=black!5, very thick, minimum size=0.5, minimum width=20mm},
|
||||
text_node/.style={}"""
|
||||
|
||||
class Emulator:
|
||||
|
||||
def __init__ (self, source_text):
|
||||
self.registers = {}
|
||||
for reg_name in REGISTERS:
|
||||
self.registers[reg_name] = 0
|
||||
self.stack = [0,1,2,3,4,5,6,7]
|
||||
self.code = []
|
||||
self.codep = []
|
||||
self.linesExec = []
|
||||
self.labels = {}
|
||||
self.changes = {}
|
||||
self.status = {}
|
||||
self.text = ""
|
||||
self.x_coord = 0
|
||||
self.last_sp = 0
|
||||
self.max_stack_size = 0
|
||||
index = 0
|
||||
for line in iter(source_text.splitlines()):
|
||||
index = self.processSourceLine(line, index)
|
||||
|
||||
def getReg (self, reg_name):
|
||||
return self.registers[reg_name]
|
||||
|
||||
def setRegs (self, reg_dict):
|
||||
for reg_name, reg_val in reg_dict.iteritems():
|
||||
self.registers[reg_name] = reg_val
|
||||
|
||||
def getVal (self, valText):
|
||||
if valText[0] == "$":
|
||||
return int(valText[1:])
|
||||
elif valText[0] == "%":
|
||||
return self.getReg(valText)
|
||||
else:
|
||||
raise "NOT A VALUE! UGHGUIHGUE!"
|
||||
|
||||
def compareVal (self, valT1, valT2):
|
||||
val1 = self.getVal(valT2)
|
||||
val2 = self.getVal(valT1)
|
||||
self.status = {"g":val1>val2}
|
||||
|
||||
def writeRegs (self, line_nr=None):
|
||||
self.text += self.draw((self.x_coord+1)*2.5-0.5, line_nr)
|
||||
self.text += "\n"
|
||||
self.x_coord += 1
|
||||
|
||||
def changedRegisters (self, *args):
|
||||
for reg, val in args:
|
||||
self.changes[reg] = val
|
||||
|
||||
def iterate (self):
|
||||
old_rip = self.registers['%rip']
|
||||
self.last_sp = self.registers['%rsp']
|
||||
#self.linesExec.append(old_rip)
|
||||
if self.registers['%rip'] >= len(self.code):
|
||||
return False
|
||||
instruct = self.code[self.registers['%rip']]
|
||||
opcode = instruct[0]
|
||||
self.changes = {}
|
||||
#print(opcode, instruct)
|
||||
if opcode == "push" or opcode == "pushq":
|
||||
self.registers['%rsp'] = self.registers['%rsp'] + 1
|
||||
self.stack[self.registers['%rsp']] = self.getReg(instruct[1])
|
||||
self.changedRegisters(('%rsp',"change"),("m"+str(self.registers['%rsp']),"insert"))
|
||||
self.max_stack_size = max(self.registers['%rsp'], self.max_stack_size)
|
||||
elif opcode == "popq":
|
||||
self.registers[instruct[1]] = self.stack[self.registers['%rsp']]
|
||||
self.registers['%rsp'] = self.registers['%rsp'] - 1
|
||||
self.changedRegisters(('%rsp',"change"),("m"+str(self.registers['%rsp']+1),"remove"))
|
||||
elif opcode == "movq" or opcode == "mov":
|
||||
self.changedRegisters((instruct[2],"change"))
|
||||
self.registers[instruct[2]] = self.getVal(instruct[1])
|
||||
elif opcode == "cmpq":
|
||||
self.compareVal(instruct[1],instruct[2])
|
||||
elif opcode == "addq":
|
||||
self.changedRegisters((instruct[2],"change"))
|
||||
self.registers[instruct[2]] = self.getVal(instruct[2]) + self.getVal(instruct[1])
|
||||
elif opcode == "subq":
|
||||
self.changedRegisters((instruct[2],"change"))
|
||||
self.registers[instruct[2]] = self.getVal(instruct[2]) - self.getVal(instruct[1])
|
||||
elif opcode == "jg":
|
||||
if self.status["g"]:
|
||||
self.registers['%rip'] = self.labels[instruct[1]]
|
||||
elif opcode == "jmp":
|
||||
self.registers['%rip'] = self.labels[instruct[1]]
|
||||
|
||||
elif opcode == "call":
|
||||
self.registers['%rsp'] = self.registers['%rsp'] + 1
|
||||
self.stack[self.registers['%rsp']] = self.registers['%rip']+1
|
||||
self.registers['%rip'] = self.labels[instruct[1]]
|
||||
self.changedRegisters(('%rsp',"change"),("m"+str(self.registers['%rsp']),"insert"))
|
||||
self.max_stack_size = max(self.registers['%rsp'], self.max_stack_size)
|
||||
elif opcode == "leave":
|
||||
self.registers["%rsp"] = self.registers["%rbp"]
|
||||
self.registers["%rbp"] = self.stack[self.registers['%rsp']]
|
||||
self.registers['%rsp'] = self.registers['%rsp'] - 1
|
||||
self.changedRegisters(('%rbp',"change"))
|
||||
self.changedRegisters(('%rsp',"change"),("m"+str(self.registers['%rsp']+1),"remove"))
|
||||
elif opcode == "ret":
|
||||
self.registers['%rip'] = self.stack[self.registers['%rsp']]
|
||||
self.registers['%rsp'] = self.registers['%rsp'] - 1
|
||||
self.changedRegisters(('%rsp',"change"),("m"+str(self.registers['%rsp']+1),"remove"))
|
||||
|
||||
if self.registers['%rip'] == old_rip:
|
||||
self.registers['%rip'] += 1
|
||||
else:
|
||||
self.changedRegisters(('%rip',"change"))
|
||||
|
||||
self.writeRegs(old_rip)
|
||||
|
||||
def processSourceLine(self, line_text, index):
|
||||
tokens = re.findall(r'[\w%:$#]+', line_text)
|
||||
if len(tokens) <= 0:
|
||||
return index
|
||||
if tokens[0][-1] == ':':
|
||||
self.labels[tokens[0][:-1]] = index
|
||||
tokens = tokens[1:]
|
||||
for i in range(len(tokens)):
|
||||
if tokens[i][0] == "#":
|
||||
tokens = tokens[:i]
|
||||
break
|
||||
self.code.append(tokens)
|
||||
self.codep.append(line_text)
|
||||
return index + 1
|
||||
|
||||
REG_STATUS_TO_COLOR = {"insert":"green","change":"yellow","remove":"red"}
|
||||
|
||||
def getRegColor (self, reg_name):
|
||||
if reg_name in self.changes:
|
||||
return self.REG_STATUS_TO_COLOR[self.changes[reg_name]]
|
||||
else:
|
||||
return "black"
|
||||
|
||||
def getLineSignature (self, line_nr):
|
||||
return [ "\\"+token if token[0]=="$" or token[0]=="%" else token for token in self.code[line_nr] ]
|
||||
|
||||
def draw (self, x, line_nr=None):
|
||||
x = str(x)
|
||||
text = ""
|
||||
pos = 0
|
||||
for reg_name in REGISTERS:
|
||||
reg_dect = "register_node, fill=" + self.getRegColor(reg_name)+"!10"
|
||||
if reg_name != "":
|
||||
text += "\t\\node["+reg_dect+"]("+reg_name[1:]+") at ("+x+", "+str(pos)+"){"+str(self.registers[reg_name])+"};\n"
|
||||
pos -= 0.5
|
||||
|
||||
pos -= 1
|
||||
base_sp = max(self.last_sp,self.registers['%rsp'])
|
||||
if self.last_sp - 1 == self.registers['%rsp']:
|
||||
pos += 0.5
|
||||
for index in range(base_sp, -1,-1):
|
||||
mem_name = "m"+str(index)
|
||||
reg_dect = "register_node, fill=" + self.getRegColor(mem_name)+"!10"
|
||||
text += "\t\\node["+reg_dect+"]("+mem_name+") at ("+x+", "+str(pos)+"){"+str(self.stack[index])+"};\n"
|
||||
pos -= 0.5
|
||||
|
||||
if line_nr != None:
|
||||
pos = 2
|
||||
signature = self.getLineSignature(line_nr)
|
||||
try:
|
||||
for i in range(3):
|
||||
text += "\t\\node[text_node]() at ("+str(float(x)-1.25)+", "+str(pos)+"){"+signature[i]+"};\n"
|
||||
pos -= 0.5
|
||||
except:
|
||||
pass
|
||||
#for line_nr in self.linesExec:
|
||||
# text += "\t\\node[text_node]() at ("+x+", "+str(pos)+"){"+self.codep[line_nr]+"};\n"
|
||||
self.linesExec = []
|
||||
|
||||
return text
|
||||
|
||||
def drawNames (self, x, stack_size=8):
|
||||
x = str(x)
|
||||
text = ""
|
||||
pos = 0
|
||||
for reg_name in REGISTERS:
|
||||
text += "\t\\node[text_node]("+reg_name[1:]+") at ("+x+", "+str(pos)+"){"+reg_name[1:]+"};\n"
|
||||
pos -= 0.5
|
||||
|
||||
text += "\t\\node[text_node]() at ("+x+", "+str(pos-0.5)+"){TOS+1};\n"
|
||||
text += "\t\\node[text_node]() at ("+x+", "+str(pos-1)+"){TOS};\n"
|
||||
pos -= 1.5
|
||||
for index in range(1,stack_size+1):
|
||||
mem_name = "m"+str(index)
|
||||
text += "\t\\node[text_node]() at ("+x+", "+str(pos)+"){TOS-"+str(index)+"};\n"
|
||||
pos -= 0.5
|
||||
|
||||
return text
|
||||
|
||||
fib_prog = """
|
||||
fib: push %rbp # push previous base pointer
|
||||
movq %rsp,%rbp # setup new base pointer
|
||||
if: cmpq $1, %rdi # if (a-1) > 0: goto long
|
||||
jg long
|
||||
quick: movq %rdi, %rax
|
||||
jmp return
|
||||
long: pushq %rdi # Push a onto the stack
|
||||
subq $1, %rdi
|
||||
call fib # Call fib(a-1)
|
||||
pushq %rax # Push fib(a-1) onto the stack
|
||||
subq $1, %rdi
|
||||
call fib # Call fib(a-2)
|
||||
popq %rdi # pop fib(a-1) into rdi
|
||||
addq %rdi, %rax # rax = fib(a-1)+fib(a-2)
|
||||
popq %rdi # Garentee that a lies in rdi.
|
||||
return: leave # Clean up (stack pointers?)
|
||||
ret # return m (rax)
|
||||
"""
|
||||
|
||||
fib_iter_prog = """
|
||||
fib: push %rbp # push previous base pointer
|
||||
movq %rsp,%rbp # setup new base pointer
|
||||
|
||||
if: cmpq $1, %rdi # if (a-1) > 0: goto loops
|
||||
jg loops
|
||||
|
||||
quick: movq %rdi, %rax
|
||||
jmp return
|
||||
|
||||
loops: movq %rdi, %r8 # i (r8) = a
|
||||
movq $1, %rdi # minus_one (rdi) = 1
|
||||
movq $0, %rax # minus_two (rax) = 0
|
||||
|
||||
loopb: movq %rdi, %9 # r = minus_one
|
||||
addq %rax, %rdi # minus_one += minus_two
|
||||
movq %9, %rax # minus_two = r
|
||||
subq $1, %r8 # i--
|
||||
cmpq $0, %r8 # if a > 0
|
||||
jg loopb
|
||||
|
||||
return: leave # Clean up
|
||||
ret # return m (rax)
|
||||
"""
|
||||
|
||||
if __name__ == "__main__":
|
||||
try:
|
||||
a = int(sys.argv[1])
|
||||
except:
|
||||
a = 2
|
||||
new_em = Emulator(fib_iter_prog)
|
||||
new_em.stack = ["junk...","calling eip"]
|
||||
for i in range(100):
|
||||
new_em.stack.append(0)
|
||||
new_em.setRegs({'%rip':0,'%rbp':'old bp','%rsp':1,'%rdi':a})
|
||||
print("Running for fib("+str(a)+")")
|
||||
new_em.writeRegs()
|
||||
while True:
|
||||
if new_em.iterate() == False:
|
||||
break
|
||||
new_em.text += new_em.drawNames(0, new_em.max_stack_size)
|
||||
print("fib("+str(a)+") = "+str(new_em.registers["%rax"]))
|
||||
with open("tikz.tex","w") as f:
|
||||
f.write("\\documentclass{standalone}\n\n\usepackage{tikz}\\begin{document}\n")
|
||||
f.write("\\begin{tikzpicture}["+OPTIONS+"]\n")
|
||||
f.write(new_em.text)
|
||||
f.write("\\end{tikzpicture}\n\\end{document}")
|
||||
Loading…
Reference in New Issue
Block a user