Moved opcodes into their own file. Now the format is crazy extensible.
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b783b22bc4
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51
infernal.py
51
infernal.py
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@ -2,6 +2,8 @@
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import re
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import sys
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from opcodes import OPCODES
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REGISTERS=["%rax", "%rbx", "%rcx", "%rdx", "%rsp", "%rbp", "%rsi", "%rdi",
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"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"]
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REG_STATUS_TO_COLOR = {
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@ -127,6 +129,7 @@ class Emulator:
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self.status["g"] = val1>val2
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self.status["l"] = val1<val2
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self.status["e"] = val1==val2
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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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@ -174,54 +177,8 @@ class Emulator:
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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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if opcode[:4] == "push":
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self.pushToStack(self.getVal(instruct[1]))
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elif opcode[:3] == "pop":
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self.registers[instruct[1]] = self.popFromStack()
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self.changedRegisters((instruct[1],"change"))
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elif opcode[:3] == "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[:3] == "add":
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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[:3] == "sub":
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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[:3] == "cmp":
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self.compareVal(instruct[1],instruct[2])
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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 == "jl":
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if self.status["l"]:
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self.registers['%rip'] = self.labels[instruct[1]]
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elif opcode == "je":
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if self.status["e"]:
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self.registers['%rip'] = self.labels[instruct[1]]
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elif opcode == "jge":
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if (self.status["g"] or self.status["e"]):
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self.registers['%rip'] = self.labels[instruct[1]]
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elif opcode == "jle":
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if (self.status["l"] or self.status["e"]):
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self.registers['%rip'] = self.labels[instruct[1]]
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elif opcode == "jne":
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if not self.status["e"]:
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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.pushToStack(self.registers['%rip']+1)
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self.registers['%rip'] = self.labels[instruct[1]]
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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.popFromStack()
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elif opcode == "ret":
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self.registers['%rip'] = self.popFromStack()
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OPCODES[opcode](self, *instruct[1:])
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if self.registers['%rip'] == old_rip:
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self.registers['%rip'] += 1
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94
opcodes.py
Normal file
94
opcodes.py
Normal file
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@ -0,0 +1,94 @@
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OPCODES = {}
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def add_opcode (*opcode_names):
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def wrapped (func):
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for name in opcode_names:
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OPCODES[name] = func
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return wrapped
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################################################################################
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# Stack
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@add_opcode("push","pushq")
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def push(emu, value):
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emu.pushToStack(emu.getVal(value))
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@add_opcode("pop","popq")
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def pop(emu, target_reg):
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emu.registers[target_reg] = emu.popFromStack()
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emu.changedRegisters((target_reg,"change"))
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# Arithmetic
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@add_opcode("mov","movq")
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def mov(emu, from_reg, target_reg):
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emu.registers[target_reg] = emu.getVal(from_reg)
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emu.changedRegisters((target_reg,"change"))
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@add_opcode("add","addq")
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def add(emu, add_val, target_reg):
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emu.registers[target_reg] += emu.getVal(add_val)
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emu.changedRegisters((target_reg,"change"))
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@add_opcode("sub","subq")
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def sub(emu, sub_val, target_reg):
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emu.registers[target_reg] -= emu.getVal(sub_val)
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emu.changedRegisters((target_reg,"change"))
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# Comparison and conditional jumping
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@add_opcode("cmp","cmpq")
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def comp(emu, val1, val2):
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emu.compareVal(val1, val2)
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@add_opcode("jg")
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def jg(emu, label):
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if emu.status["g"]:
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emu.registers['%rip'] = emu.labels[label]
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@add_opcode("jl")
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def jl(emu, label):
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if emu.status["l"]:
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emu.registers['%rip'] = emu.labels[label]
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@add_opcode("je")
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def je(emu, label):
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if emu.status["e"]:
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emu.registers['%rip'] = emu.labels[label]
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@add_opcode("jge")
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def jge(emu, label):
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if emu.status["g"] or emu.status["e"]:
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emu.registers['%rip'] = emu.labels[label]
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@add_opcode("jle")
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def jle(emu, label):
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if emu.status["l"] or emu.status["e"]:
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emu.registers['%rip'] = emu.labels[label]
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@add_opcode("jne")
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def jne(emu, label):
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if not emu.status["e"]:
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emu.registers['%rip'] = emu.labels[label]
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# Unconditional Jumping
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@add_opcode("jmp")
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def jmp(emu, label):
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emu.registers['%rip'] = emu.labels[label]
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@add_opcode("call")
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def call(emu, label):
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emu.pushToStack(emu.registers['%rip']+1)
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emu.registers['%rip'] = emu.labels[label]
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@add_opcode("leave")
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def leave(emu):
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emu.registers["%rsp"] = emu.registers["%rbp"]
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emu.registers["%rbp"] = emu.popFromStack()
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@add_opcode("ret")
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def ret(emu):
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emu.registers['%rip'] = emu.popFromStack()
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