unicorn/regress/callback-pc.py

57 lines
1.6 KiB
Python
Executable File

#!/usr/bin/env python
# reg_write() can't modify PC from within trace callbacks
from __future__ import print_function
from unicorn import *
from unicorn.arm_const import *
BASE_ADDRESS = 0x10000000
# sub sp, #0xc
THUMB_CODE = "\x83\xb0" * 5
# callback for tracing instructions
def hook_code(uc, address, size, user_data):
print(">>> Tracing instruction at 0x%x, instruction size = %u" % (address, size))
mu = user_data
print(">>> Setting PC to 0xffffffff")
mu.reg_write(ARM_REG_PC, 0xffffffff)
# callback for tracing basic blocks
def hook_block(uc, address, size, user_data):
print(">>> Tracing basic block at 0x%x, block size = 0x%x" %(address, size))
mu = user_data
print(">>> Setting PC to 0xffffffff")
mu.reg_write(ARM_REG_PC, 0xffffffff)
# set up emulation
def instruction_trace_test():
try:
# initialize emulator in ARM's Thumb mode
mu = Uc(UC_ARCH_ARM, UC_MODE_THUMB)
# map some memory
mu.mem_map(BASE_ADDRESS, 2 * 1024 * 1024)
# write machine code to be emulated to memory
mu.mem_write(BASE_ADDRESS, THUMB_CODE)
# setup stack
mu.reg_write(ARM_REG_SP, BASE_ADDRESS + 2 * 1024 * 1024)
# tracing all instructions with customized callback
mu.hook_add(UC_HOOK_CODE, hook_code, user_data=mu)
# tracing all basic blocks with customized callback
mu.hook_add(UC_HOOK_BLOCK, hook_block, user_data=mu)
# emulate machine code in infinite time
mu.emu_start(BASE_ADDRESS, BASE_ADDRESS + len(THUMB_CODE))
except UcError as e:
print("ERROR: %s" % e)
if __name__ == '__main__':
instruction_trace_test()