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