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PyInstruction.py
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PyInstruction.py
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#!/usr/bin/env python
########################################################################
#
# PyEmu: scriptable x86 emulator
#
# Cody Pierce - cpierce@tippingpoint.com - 2007
#
# License: None
#
########################################################################
import sys, os, time, struct, re
sys.path.append("lib")
import pydasm
'''
PyOperand:
Stores information about a single operand. We duplicate pydasm
information in case one day we want to replace it.
'''
class PyOperand:
def __init__(self, operand):
self.type = 0x0
self.reg = 0x0
self.basereg = 0x0
self.indexreg = 0x0
self.scale = 0x0
self.dispbytes = 0x0
self.dispoffset = 0x0
self.immbytes = 0x0
self.immoffset = 0x0
self.sectionbytes = 0x0
self.section = 0x0
self.displacement = 0x0
self.immediate = 0x0
self.flags = 0x0
# Set up the operand information
self.set_operand(operand)
#
# set_operand: Responsible for initializing the operands values from pydasm
#
def set_operand(self, operand):
self.type = operand.type
self.reg = operand.reg
self.basereg = operand.basereg
self.indexreg = operand.indexreg
self.scale = operand.scale
self.dispbytes = operand.dispbytes
self.dispoffset = operand.dispoffset
self.immbytes = operand.immbytes
self.immoffset = operand.immoffset
self.sectionbytes = operand.sectionbytes
self.section = operand.section
self.displacement = operand.displacement
self.immediate = operand.immediate
self.flags = operand.flags
'''
PyInstruction:
Contains information about each instruction including opcode and
operands. We duplicate pydasm information in case one day we want
to replace it.
'''
class PyInstruction:
def __init__(self, instruction):
self.length = 0x0
self.type = 0x0
self.mode = 0x0
self.opcode = 0x0
self.modrm = 0x0
self.sib = 0x0
self.extindex = 0x0
self.fpuindex = 0x0
self.dispbytes = 0x0
self.immbytes = 0x0
self.sectionbytes = 0x0
self.flags = 0x0
self.disasm = ""
self.mnemonic = ""
self.op1 = ""
self.op2 = ""
self.op3 = ""
# Set up our instruction values
self.set_instruction(instruction)
def group1(self):
return bool(self.flags & 0xff000000)
def group2(self):
return bool(self.flags & 0x00ff0000)
def group3(self):
return bool(self.flags & 0x0000ff00)
def lock(self):
return bool(self.flags & 0x01000000)
def repne(self):
return bool(self.flags & 0x02000000)
def rep(self):
return bool(self.flags & 0x03000000)
def repe(self):
return bool(self.flags & 0x03000000)
def es_override(self):
return bool(self.flags & 0x00010000)
def cs_override(self):
return bool(self.flags & 0x00020000)
def ss_override(self):
return bool(self.flags & 0x00030000)
def ds_override(self):
return bool(self.flags & 0x00040000)
def fs_override(self):
return bool(self.flags & 0x00050000)
def gs_override(self):
return bool(self.flags & 0x00060000)
def operand_so(self):
return bool(self.flags & 0x00000100)
def address_so(self):
return bool(self.flags & 0x00001000)
def get_rm(self):
if self.modrm:
return self.modrm & 0x7
else:
return False
return False
def get_reg_opcode(self):
if self.modrm:
return (self.modrm >> 3) & 0x7
else:
return False
return False
def get_mod(self):
if self.modrm:
return (self.modrm >> 6) & 0x7
else:
return False
return False
def get_base(self):
if self.sib:
return self.sib & 0x7
else:
return False
return False
def get_index(self):
if self.sib:
return (self.sib >> 3) & 0x7
else:
return False
return False
def get_scale(self):
if self.sib:
return (self.sib >> 6) & 0x7
else:
return False
return False
#
# set_instruction: Initializes the class members from pydasm
#
def set_instruction(self, instruction):
self.length = instruction.length
self.type = instruction.type
self.mode = instruction.mode
self.opcode = instruction.opcode
self.modrm = instruction.modrm
self.sib = instruction.sib
self.extindex = instruction.extindex
self.fpuindex = instruction.fpuindex
self.dispbytes = instruction.dispbytes
self.immbytes = instruction.immbytes
self.sectionbytes = instruction.sectionbytes
self.flags = instruction.flags
#
# In the future we'll use a PyOperand class, for now its to slow
#
if instruction.op1.type:
self.op1 = instruction.op1
if instruction.op2.type:
self.op2 = instruction.op2
if instruction.op3.type:
self.op3 = instruction.op3
self.mnemonic = pydasm.get_mnemonic_string(instruction, pydasm.FORMAT_INTEL).rstrip(" ")