test1.py

#!/usr/bin/python

from __future__ import print_function
from unicorn import *
from unicorn.x86_const import *

# code to be emulated
X86_CODE32 = b"\x41\x4a" # INC ecx; DEC edx

# memory address where emulation starts
ADDRESS = 0x1000000

def emulate():
  try:
    # Initialize emulator in X86-32bit mode
    mu = Uc(UC_ARCH_X86, UC_MODE_32)

    # map 2MB memory for this emulation
    mu.mem_map(ADDRESS, 2 * 1024 * 1024)

    # write machine code to be emulated to memory
    mu.mem_write(ADDRESS, X86_CODE32)

    # initialize machine registers
    mu.reg_write(UC_X86_REG_ECX, 0x1234)
    mu.reg_write(UC_X86_REG_EDX, 0x7890)

    # emulate code in infinite time & unlimited instructions
    mu.emu_start(ADDRESS, ADDRESS + len(X86_CODE32))

    r_ecx = mu.reg_read(UC_X86_REG_ECX)
    r_edx = mu.reg_read(UC_X86_REG_EDX)
    return (r_ecx, r_edx)
  except UcError as e:
    return (-1, -1)

if __name__ == '__main__':
    r_ecx, r_edx = emulate()
    print(">>> ECX = 0x%x" %r_ecx)
    print(">>> EDX = 0x%x" %r_edx)