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PyCPU.py
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PyCPU.py
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#!/usr/bin/env python
########################################################################
#
# PyEmu: scriptable x86 emulator
#
# Cody Pierce - [email protected] - 2007
#
# License: None
#
########################################################################
import sys, os, time, struct, re
sys.path.append("lib")
import pydasm
import math
from PyContext import PyContext
from PyFlags import PyFlags
from PyInstruction import *
from PyDebug import *
'''
PyCPU:
The heart of PyEmu. The CPU class handles execution of instructions.
'''
class PyCPU:
DEBUG = 3
# Bitmap of eflags
eflags_map = {"CF": 0x1,
"PF": 0x4,
"AF": 0x10,
"ZF": 0x40,
"SF": 0x80,
"TF": 0x100,
"IF": 0x200,
"DF": 0x400,
"OF": 0x800,
"IOPL": 0x2000,
"NT": 0x4000,
"RF": 0x10000,
"VM": 0x20000,
"AC": 0x40000,
"VIF": 0x80000,
"VIP": 0x100000,
"ID": 0x200000 }
def __init__(self, emu):
# We store the emu object so we can communicate and request info
self.emu = emu
# Initialize all our registers and flags
self.EAX = 0x00000000
self.ECX = 0x00000000
self.EDX = 0x00000000
self.EBX = 0x00000000
self.ESP = 0x00000000
self.EBP = 0x00000000
self.ESI = 0x00000000
self.EDI = 0x00000000
self.EIP = 0x00000000
self.GS = 0x0000
self.FS = 0x0000
self.ES = 0x0000
self.DS = 0x0000
self.CS = 0x0000
self.SS = 0x0000
self.CF = 0
self.PF = 0
self.AF = 0
self.ZF = 0
self.SF = 0
self.TF = 0
self.IF = 0
self.DF = 0
self.OF = 0
self.IOPL = 0
self.NT = 0
self.RF = 0
self.VM = 0
self.AC = 0
self.VIF = 0
self.VIP = 0
self.ID = 0
# The function table of all the instructions supported. I use a
# mnemonic table instead of an opcode map to allow mnemonic handlers.
self.supported_instructions = { "adc": lambda instruction: self.ADC(instruction),
"add": lambda instruction: self.ADD(instruction),
"and": lambda instruction: self.AND(instruction),
"bswap": lambda instruction: self.BSWAP(instruction),
"call": lambda instruction: self.CALL(instruction),
"cdq": lambda instruction: self.CDQ(instruction),
"clc": lambda instruction: self.CLC(instruction),
"cld": lambda instruction: self.CLD(instruction),
"cmp": lambda instruction: self.CMP(instruction),
"cmps": lambda instruction: self.CMPS(instruction),
"cmpsb": lambda instruction: self.CMPSB(instruction),
"cmpsw": lambda instruction: self.CMPSW(instruction),
"cmpsd": lambda instruction: self.CMPSD(instruction),
"dec": lambda instruction: self.DEC(instruction),
"div": lambda instruction: self.DIV(instruction),
"idiv": lambda instruction: self.IDIV(instruction),
"imul": lambda instruction: self.IMUL(instruction),
"inc": lambda instruction: self.INC(instruction),
"int": lambda instruction: self.INT(instruction),
"int3": lambda instruction: self.INT(instruction),
"ja": lambda instruction: self.JA(instruction),
"jb": lambda instruction: self.JB(instruction),
"jbe": lambda instruction: self.JBE(instruction),
"jc": lambda instruction: self.JC(instruction),
"jg": lambda instruction: self.JG(instruction),
"jge": lambda instruction: self.JGE(instruction),
"jl": lambda instruction: self.JL(instruction),
"jle": lambda instruction: self.JLE(instruction),
"jmp": lambda instruction: self.JMP(instruction),
"jna": lambda instruction: self.JNA(instruction),
"jnb": lambda instruction: self.JNB(instruction),
"jnc": lambda instruction: self.JNC(instruction),
"jng": lambda instruction: self.JNG(instruction),
"jnl": lambda instruction: self.JNL(instruction),
"jns": lambda instruction: self.JNS(instruction),
"jnz": lambda instruction: self.JNZ(instruction),
"js": lambda instruction: self.JS(instruction),
"jz": lambda instruction: self.JZ(instruction),
"lea": lambda instruction: self.LEA(instruction),
"leave": lambda instruction: self.LEAVE(instruction),
"mov": lambda instruction: self.MOV(instruction),
"movs": lambda instruction: self.MOVS(instruction),
"movsb": lambda instruction: self.MOVSB(instruction),
"movsw": lambda instruction: self.MOVSW(instruction),
"movsd": lambda instruction: self.MOVSD(instruction),
"movsx": lambda instruction: self.MOVSX(instruction),
"movzx": lambda instruction: self.MOVZX(instruction),
"mul": lambda instruction: self.MUL(instruction),
"neg": lambda instruction: self.NEG(instruction),
"nop": lambda instruction: self.NOP(instruction),
"not": lambda instruction: self.NOT(instruction),
"or": lambda instruction: self.OR(instruction),
"pop": lambda instruction: self.POP(instruction),
"push": lambda instruction: self.PUSH(instruction),
"pusha": lambda instruction: self.PUSHA(instruction),
"rcr": lambda instruction: self.RCR(instruction),
"rcl": lambda instruction: self.RCL(instruction),
"ret": lambda instruction: self.RET(instruction),
"retn": lambda instruction: self.RET(instruction),
"rol": lambda instruction: self.ROL(instruction),
"ror": lambda instruction: self.ROR(instruction),
"sal": lambda instruction: self.SAL(instruction),
"sar": lambda instruction: self.SAR(instruction),
"sbb": lambda instruction: self.SBB(instruction),
"scas": lambda instruction: self.SCAS(instruction),
"scasb": lambda instruction: self.SCASB(instruction),
"scasw": lambda instruction: self.SCASW(instruction),
"scasd": lambda instruction: self.SCASD(instruction),
"setna": lambda instruction: self.SETNA(instruction),
"setle": lambda instruction: self.SETLE(instruction),
"setge": lambda instruction: self.SETGE(instruction),
"setg": lambda instruction: self.SETG(instruction),
"sete": lambda instruction: self.SETE(instruction),
"setc": lambda instruction: self.SETC(instruction),
"setbe": lambda instruction: self.SETBE(instruction),
"setb": lambda instruction: self.SETB(instruction),
"setae": lambda instruction: self.SETAE(instruction),
"seta": lambda instruction: self.SETA(instruction),
"setps": lambda instruction: self.SETPS(instruction),
"setpo": lambda instruction: self.SETPO(instruction),
"setpe": lambda instruction: self.SETPE(instruction),
"setp": lambda instruction: self.SETP(instruction),
"seto": lambda instruction: self.SETO(instruction),
"setns": lambda instruction: self.SETNS(instruction),
"setnp": lambda instruction: self.SETNP(instruction),
"setno": lambda instruction: self.SETNO(instruction),
"setnl": lambda instruction: self.SETNL(instruction),
"setnge": lambda instruction: self.SETNGE(instruction),
"setng": lambda instruction: self.SETNG(instruction),
"setne": lambda instruction: self.SETNE(instruction),
"setnc": lambda instruction: self.SETNC(instruction),
"setnbe": lambda instruction: self.SETNBE(instruction),
"setnb": lambda instruction: self.SETNB(instruction),
"setnae": lambda instruction: self.SETNAE(instruction),
"setl": lambda instruction: self.SETL(instruction),
"setnle": lambda instruction: self.SETNLE(instruction),
"setnz": lambda instruction: self.SETNZ(instruction),
"setz": lambda instruction: self.SETZ(instruction),
"shl": lambda instruction: self.SHL(instruction),
"shr": lambda instruction: self.SHR(instruction),
"stos": lambda instruction: self.STOS(instruction),
"stosb": lambda instruction: self.STOSB(instruction),
"stosw": lambda instruction: self.STOSW(instruction),
"stosd": lambda instruction: self.STOSD(instruction),
"sub": lambda instruction: self.SUB(instruction),
"test": lambda instruction: self.TEST(instruction),
"xchg": lambda instruction: self.XCHG(instruction),
"xor": lambda instruction: self.XOR(instruction)}
def get_msb(self, value, size):
return (value >> ((8 * size) - 1))
def get_lsb(self, value):
return (value & 0x1)
def get_mask(self, size):
return (2 ** (8 * size) - 1)
#
# get_register: This method takes either a register string or index
# returning its value. Size is used for convenience.
# We also check our user handlers and call them if they
# exist.
#
def get_register(self, register, size):
if size == 4:
if register == "EAX" or register == 0:
register = "EAX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EAX, "read")
return self.EAX
elif register == "ECX" or register == 1:
register = "ECX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ECX, "read")
return self.ECX
elif register == "EDX" or register == 2:
register = "EDX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EDX, "read")
return self.EDX
elif register == "EBX" or register == 3:
register = "EBX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EBX, "read")
return self.EBX
elif register == "ESP" or register == 4:
register = "ESP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ESP, "read")
return self.ESP
elif register == "EBP" or register == 5:
register = "EBP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EBP, "read")
return self.EBP
elif register == "ESI" or register == 6:
register = "ESI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ESI, "read")
return self.ESI
elif register == "EDI" or register == 7:
register = "EDI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EDI, "read")
return self.EDI
elif register == "EIP":
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EIP, "read")
return self.EIP
elif size == 2:
# Registers
if register == "AX" or register == 0:
register = "AX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EAX & 0xFFFF, "read")
return self.EAX & 0xFFFF
elif register == "CX" or register == 1:
register = "CX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ECX & 0xFFFF, "read")
return self.ECX & 0xFFFF
elif register == "DX" or register == 2:
register = "DX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EDX & 0xFFFF, "read")
return self.EDX & 0xFFFF
elif register == "BX" or register == 3:
register = "BX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EBX & 0xFFFF, "read")
return self.EBX & 0xFFFF
elif register == "SP" or register == 4:
register = "SP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ESP & 0xFFFF, "read")
return self.ESP & 0xFFFF
elif register == "BP" or register == 5:
register = "BP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EBP & 0xFFFF, "read")
return self.EBP & 0xFFFF
elif register == "SI" or register == 6:
register = "SI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ESI & 0xFFFF, "read")
return self.ESI & 0xFFFF
elif register == "DI" or register == 7:
register = "DI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EDI & 0xFFFF, "read")
return self.EDI & 0xFFFF
# Segment registers
elif register == "CS":
register = "CS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.CS & 0xFFFF, "read")
return self.CS & 0xFFFF
elif register == "SS":
register = "SS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.SS & 0xFFFF, "read")
return self.SS & 0xFFFF
elif register == "DS":
register = "DS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.DS & 0xFFFF, "read")
return self.DS & 0xFFFF
elif register == "ES":
register = "ES"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ES & 0xFFFF, "read")
return self.ES & 0xFFFF
elif register == "FS":
register = "FS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.FS & 0xFFFF, "read")
return self.FS & 0xFFFF
elif register == "GS":
register = "GS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.GS & 0xFFFF, "read")
return self.GS & 0xFFFF
elif size == 1:
if register == "AL" or register == 0:
register = "AL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EAX & 0xFF, "read")
return self.EAX & 0xFF
elif register == "CL" or register == 1:
register = "CL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.ECX & 0xFF, "read")
return self.ECX & 0xFF
elif register == "DL" or register == 2:
register = "DL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EDX & 0xFF, "read")
return self.EDX & 0xFF
elif register == "BL" or register == 3:
register = "BL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, self.EBX & 0xFF, "read")
return self.EBX & 0xFF
elif register == "AH" or register == 4:
register = "AH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, ((self.EAX & 0xFF00) >> 8), "read")
return ((self.EAX & 0xFF00) >> 8)
elif register == "CH" or register == 5:
register = "CH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, ((self.ECX & 0xFF00) >> 8), "read")
return ((self.ECX & 0xFF00) >> 8)
elif register == "DH" or register == 6:
register = "DH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, ((self.EDX & 0xFF00) >> 8), "read")
return ((self.EDX & 0xFF00) >> 8)
elif register == "BH" or register == 7:
register = "BH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, ((self.EBX & 0xFF00) >> 8), "read")
return ((self.EBX & 0xFF00) >> 8)
# Flags
elif register == "CF":
register = "CF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.CF & 0xFF), "read")
return (self.CF & 0xFF)
elif register == "PF":
register = "PF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.PF & 0xFF), "read")
return (self.PF & 0xFF)
elif register == "AF":
register = "AF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.AF & 0xFF), "read")
return (self.AF & 0xFF)
elif register == "ZF":
register = "ZF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.ZF & 0xFF), "read")
return (self.ZF & 0xFF)
elif register == "SF":
register = "SF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.SF & 0xFF), "read")
return (self.SF & 0xFF)
elif register == "TF":
register = "TF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.TF & 0xFF), "read")
return (self.TF & 0xFF)
elif register == "IF":
register = "IF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.IF & 0xFF), "read")
return (self.IF & 0xFF)
elif register == "DF":
register = "DF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.DF & 0xFF), "read")
return (self.DF & 0xFF)
elif register == "OF":
register = "OF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.OF & 0xFF), "read")
return (self.OF & 0xFF)
elif register == "IOPL":
register = "IOPL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.IOPL & 0xFF), "read")
return (self.IOPL & 0xFF)
elif register == "NT":
register = "NT"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.NT & 0xFF), "read")
return (self.NT & 0xFF)
elif register == "RF":
register = "RF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.RF & 0xFF), "read")
return (self.RF & 0xFF)
elif register == "VM":
register = "VM"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.VM & 0xFF), "read")
return (self.VM & 0xFF)
elif register == "AC":
register = "AC"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.AC & 0xFF), "read")
return (self.AC & 0xFF)
elif register == "VIF":
register = "VIF"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.VIF & 0xFF), "read")
return (self.VIF & 0xFF)
elif register == "VIP":
register = "VIP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.VIP & 0xFF), "read")
return (self.VIP & 0xFF)
elif register == "ID":
register = "ID"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, (self.ID & 0xFF), "read")
return (self.ID & 0xFF)
else:
return False
return False
# Convenience get_register wrapper function
def get_register32(self, register):
return self.get_register(register, 4)
def get_register16(self, register):
return self.get_register(register, 2)
def get_register8(self, register):
return self.get_register(register, 1)
#
# get_memory: This is called when the CPU requests memory. It also
# calls any handlers we may have.
#
def get_memory(self, address, size):
value = self.emu.memory.get_memory(address, size)
# The processor only fetches mem in dword max, this lets us hack
# around code fetches
if size <= 4:
# Call our memory access handler
if self.emu.memory_access_handler:
self.emu.memory_access_handler(self.emu, address, value, size, "read")
# Call our memory read handler
if self.emu.memory_read_handler:
result = self.emu.memory_read_handler(self.emu, address, value, size)
else:
result = value
# Call our memory handler
if address in self.emu.memory_handlers:
result = self.emu.memory_handlers[address](self.emu, address, value, size, "read")
else:
result = value
# Check if we are touching stack
if address <= self.emu.stack_base and address >= (self.emu.stack_base - self.emu.stack_size):
if self.emu.stack_access_handler:
self.emu.stack_access_handler(self.emu, address, value, size, "read")
# Call our stack read handler
if self.emu.stack_read_handler:
result = self.emu.stack_read_handler(self.emu, address, value, size)
else:
result = value
elif address <= self.emu.heap_base and address >= (self.emu.heap_base + self.emu.heap_size):
if self.emu.heap_access_handler:
self.emu.heap_access_handler(self.emu, address, value, size, "read")
# Call our specific heap read handler
if self.emu.heap_read_handler:
result = self.emu.heap_read_handler(self.emu, address, value, size)
else:
result = value
# This lets the user control what is read
if not isinstance(result, bool):
return result
return value
# Convenience wrappers for get_memory
def get_memory32(self, address):
value = self.get_memory(address, 4)
return value
def get_memory16(self, address):
value = self.get_memory(address, 2)
return (value & 0x0000ffff)
def get_memory8(self, address):
value = self.get_memory(address, 1)
return (value & 0x000000ff)
#
# get_context: Builds a context object for passing to the emulator
#
def get_context(self):
newcontext = PyContext()
newcontext.EAX = self.EAX
newcontext.ECX = self.ECX
newcontext.EDX = self.EDX
newcontext.EBX = self.EBX
newcontext.ESP = self.ESP
newcontext.EBP = self.EBP
newcontext.ESI = self.ESI
newcontext.EDI = self.EDI
newcontext.EIP = self.EIP
newcontext.GS = self.GS
newcontext.FS = self.FS
newcontext.ES = self.ES
newcontext.DS = self.DS
newcontext.CS = self.DS
newcontext.SS = self.SS
flags = 0x0000000
if self.CF: flags |= self.eflags_map["CF"]
if self.PF: flags |= self.eflags_map["PF"]
if self.AF: flags |= self.eflags_map["AF"]
if self.ZF: flags |= self.eflags_map["ZF"]
if self.SF: flags |= self.eflags_map["SF"]
if self.TF: flags |= self.eflags_map["TF"]
if self.IF: flags |= self.eflags_map["IF"]
if self.DF: flags |= self.eflags_map["DF"]
if self.OF: flags |= self.eflags_map["OF"]
if self.IOPL: flags |= self.eflags_map["IOPL"]
if self.NT: flags |= self.eflags_map["NT"]
if self.RF: flags |= self.eflags_map["RF"]
if self.VM: flags |= self.eflags_map["VM"]
if self.AC: flags |= self.eflags_map["AC"]
if self.VIF: flags |= self.eflags_map["VIF"]
if self.VIP: flags |= self.eflags_map["VIP"]
if self.ID: flags |= self.eflags_map["ID"]
newcontext.EFLAGS = flags
return newcontext
def clear_eflags(self):
self.CF = 0
self.PF = 0
self.AF = 0
self.ZF = 0
self.SF = 0
self.TF = 0
self.IF = 0
self.DF = 0
self.OF = 0
self.IOPL = 0
self.NT = 0
self.RF = 0
self.VM = 0
self.AC = 0
self.VIF = 0
self.VIP = 0
self.ID = 0
return True
#
# sanitize_value: Masks the value based on size
#
def sanitize_value(self, value, size):
if size == 1:
return value & 0xff
elif size == 2:
return value & 0xffff
elif size == 4:
return value & 0xffffffff
else:
return False
#
# set_context: Will set the CPU context from a PyContext if called.
#
def set_context(self, context):
self.EAX = context.EAX
self.ECX = context.ECX
self.EDX = context.EDX
self.EBX = context.EBX
self.ESP = context.ESP
self.EBP = context.EBP
self.ESI = context.ESI
self.EDI = context.EDI
self.EIP = context.EIP
self.GS = context.GS
self.FS = context.FS
self.ES = context.ES
self.DS = context.DS
self.CS = context.CS
self.SS = context.SS
if context.EFLAGS & self.eflags_map["CF"]:
self.CF = 1
if context.EFLAGS & self.eflags_map["PF"]:
self.PF = 1
if context.EFLAGS & self.eflags_map["AF"]:
self.AF = 1
if context.EFLAGS & self.eflags_map["ZF"]:
self.ZF = 1
if context.EFLAGS & self.eflags_map["SF"]:
self.SF = 1
if context.EFLAGS & self.eflags_map["TF"]:
self.TF = 1
if context.EFLAGS & self.eflags_map["IF"]:
self.IF = 1
if context.EFLAGS & self.eflags_map["DF"]:
self.DF = 1
if context.EFLAGS & self.eflags_map["OF"]:
self.OF = 1
if context.EFLAGS & self.eflags_map["IOPL"]:
self.IOPL = 1
if context.EFLAGS & self.eflags_map["NT"]:
self.NT = 1
if context.EFLAGS & self.eflags_map["RF"]:
self.RF = 1
if context.EFLAGS & self.eflags_map["VM"]:
self.VM = 1
if context.EFLAGS & self.eflags_map["AC"]:
self.AC = 1
if context.EFLAGS & self.eflags_map["VIF"]:
self.VIF = 1
if context.EFLAGS & self.eflags_map["VIP"]:
self.VIP = 1
if context.EFLAGS & self.eflags_map["ID"]:
self.ID = 1
return True
#
# set_register: Sets the supplied register to value. can be used with
# the string representation or index. Also calls our user
# handler if present.
#
def set_register(self, register, value, size):
value &= self.get_mask(size)
if size == 4:
if register == "EAX" or register == 0:
register = "EAX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EAX = value
return True
elif register == "ECX" or register == 1:
register = "ECX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ECX = value
return True
elif register == "EDX" or register == 2:
register = "EDX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EDX = value
return True
elif register == "EBX" or register == 3:
register = "EBX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EBX = value
return True
elif register == "ESP" or register == 4:
register = "ESP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ESP = value
return True
elif register == "EBP" or register == 5:
register = "EBP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EBP = value
return True
elif register == "ESI" or register == 6:
register = "ESI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ESI = value
return True
elif register == "EDI" or register == 7:
register = "EDI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EDI = value
return True
elif register == "EIP":
register = "EIP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EIP = value
return True
elif size == 2:
# Registers
if register == "AX" or register == 0:
register = "AX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EAX = (self.EAX & 0xffff0000) | (value & 0xffff)
return True
elif register == "CX" or register == 1:
register = "CX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ECX = (self.ECX & 0xffff0000) | (value & 0xffff)
return True
elif register == "DX" or register == 2:
register = "DX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EDX = (self.EDX & 0xffff0000) | (value & 0xffff)
return True
elif register == "BX" or register == 3:
register = "BX"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EBX = (self.EBX & 0xffff0000) | (value & 0xffff)
return True
elif register == "SP" or register == 4:
register = "SP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ESP = (self.ESP & 0xffff0000) | (value & 0xffff)
return True
elif register == "BP" or register == 5:
register = "BP"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EBP = (self.EBP & 0xffff0000) | (value & 0xffff)
return True
elif register == "SI" or register == 6:
register = "SI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ESI = (self.ESI & 0xffff0000) | (value & 0xffff)
return True
elif register == "DI" or register == 7:
register = "DI"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EDI = (self.EDI & 0xffff0000) | (value & 0xffff)
return True
# Segment Registers
elif register == "CS":
register = "CS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.CS = value & 0xffff
return True
elif register == "SS":
register = "SS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.SS = value & 0xffff
return True
elif register == "DS":
register = "DS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.DS = value & 0xffff
return True
elif register == "ES":
register = "ES"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ES = value & 0xffff
return True
elif register == "FS":
register = "FS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.FS = value & 0xffff
return True
elif register == "GS":
register = "GS"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.GS = value & 0xffff
return True
elif size == 1:
if register == "AL" or register == 0:
register = "AL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EAX = (self.EAX & 0xffffff00) | (value & 0xff)
return True
elif register == "CL" or register == 1:
register = "CL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ECX = (self.ECX & 0xffffff00) | (value & 0xff)
return True
elif register == "DL" or register == 2:
register = "DL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EDX = (self.EDX & 0xffffff00) | (value & 0xff)
return True
elif register == "BL" or register == 3:
register = "BL"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EBX = (self.EBX & 0xffffff00) | (value & 0xff)
return True
elif register == "AH" or register == 4:
register = "AH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EAX = (self.EAX & 0xffff00ff) | ((value & 0xff) << 8)
return True
elif register == "CH" or register == 5:
register = "CH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.ECX = (self.ECX & 0xffff00ff) | ((value & 0xff) << 8)
return True
elif register == "DH" or register == 6:
register = "DH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EDX = (self.EDX & 0xffff00ff) | ((value & 0xff) << 8)
return True
elif register == "BH" or register == 6:
register = "BH"
if register in self.emu.register_handlers:
self.emu.register_handlers[register](self.emu, register, value, "write")
self.EBX = (self.EBX & 0xffff00ff) | ((value & 0xff) << 8)
return True
# Flags