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#!/usr/bin/env python
# Sample code for ARM big endian of Unicorn. zhangwm <rustydaar@gmail.com>
from unicorn import *
from unicorn.arm_const import *
# code to be emulated
ARM_CODE = b"\xe3\xa0\x00\x37\xe0\x42\x10\x03" # mov r0, #0x37; sub r1, r2, r3
THUMB_CODE = b"\xb0\x83" # sub sp, #0xc
# memory address where emulation starts
ADDRESS = 0x10000
# 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))
# callback for tracing instructions
def hook_code(uc, address, size, user_data):
print(">>> Tracing instruction at 0x%x, instruction size = 0x%x" % (address, size))
# Test ARM
def test_arm():
print("Emulate ARM Big-Endian code")
try:
# Initialize emulator in ARM mode
mu = Uc(UC_ARCH_ARM, UC_MODE_ARM | UC_MODE_BIG_ENDIAN)
# 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, ARM_CODE)
# initialize machine registers
mu.reg_write(UC_ARM_REG_R0, 0x1234)
mu.reg_write(UC_ARM_REG_R2, 0x6789)
mu.reg_write(UC_ARM_REG_R3, 0x3333)
mu.reg_write(UC_ARM_REG_APSR, 0xFFFFFFFF) # All application flags turned on
# tracing all basic blocks with customized callback
mu.hook_add(UC_HOOK_BLOCK, hook_block)
# tracing one instruction at ADDRESS with customized callback
mu.hook_add(UC_HOOK_CODE, hook_code, begin=ADDRESS, end=ADDRESS)
# emulate machine code in infinite time
mu.emu_start(ADDRESS, ADDRESS + len(ARM_CODE))
# now print out some registers
print(">>> Emulation done. Below is the CPU context")
r0 = mu.reg_read(UC_ARM_REG_R0)
r1 = mu.reg_read(UC_ARM_REG_R1)
print(">>> R0 = 0x%x" % r0)
print(">>> R1 = 0x%x" % r1)
except UcError as e:
print("ERROR: %s" % e)
def test_thumb():
print("Emulate THUMB code")
try:
# Initialize emulator in thumb mode
mu = Uc(UC_ARCH_ARM, UC_MODE_THUMB | UC_MODE_BIG_ENDIAN)
# 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, THUMB_CODE)
# initialize machine registers
mu.reg_write(UC_ARM_REG_SP, 0x1234)
# tracing all basic blocks with customized callback
mu.hook_add(UC_HOOK_BLOCK, hook_block)
# tracing all instructions with customized callback
mu.hook_add(UC_HOOK_CODE, hook_code)
# emulate machine code in infinite time
# Note we start at ADDRESS | 1 to indicate THUMB mode.
mu.emu_start(ADDRESS | 1, ADDRESS + len(THUMB_CODE))
# now print out some registers
print(">>> Emulation done. Below is the CPU context")
sp = mu.reg_read(UC_ARM_REG_SP)
print(">>> SP = 0x%x" % sp)
except UcError as e:
print("ERROR: %s" % e)
if __name__ == '__main__':
test_arm()
print("=" * 26)
test_thumb()
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