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# reg_write() can't modify PC from within trace callbacks
# issue #210
import regress
from unicorn import *
from unicorn.arm_const import *
BASE_ADDRESS = 0x10000000
THUMB_CODE = b"\x83\xb0" * 5 # sub sp, #0xc
TARGET_PC = 0xffffffff
class CallBackPCTest(regress.RegressTest):
def test_instruction_trace(self):
# 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(UC_ARM_REG_SP, BASE_ADDRESS + 2 * 1024 * 1024)
def __hook_callback(uc, address, size, user_data):
regress.logger.debug(">>> Tracing instruction at 0x%x, instruction size = %u", address, size)
regress.logger.debug(">>> Setting PC to %#x", TARGET_PC)
uc.reg_write(UC_ARM_REG_PC, TARGET_PC)
# tracing all instructions with customized callback
mu.hook_add(UC_HOOK_CODE, __hook_callback)
# emulate one instruction. since pc was modified to point to an unmapped
# area, this is expected to fail
with self.assertRaises(UcError) as raisedEx:
mu.emu_start(BASE_ADDRESS, BASE_ADDRESS + len(THUMB_CODE), count=1)
self.assertEqual(UC_ERR_FETCH_UNMAPPED, raisedEx.exception.errno)
# the block callback set PC to 0xffffffff, so at this point, the PC
# value should be 0xffffffff.
self.assertEqual(TARGET_PC, mu.reg_read(UC_ARM_REG_PC) | 0b1)
def test_block_trace(self):
# 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(UC_ARM_REG_SP, BASE_ADDRESS + 2 * 1024 * 1024)
def __hook_callback(uc, address, size, user_data):
regress.logger.debug(">>> Tracing basic block at 0x%x, block size = 0x%x", address, size)
regress.logger.debug(">>> Setting PC to %#x", TARGET_PC)
uc.reg_write(UC_ARM_REG_PC, TARGET_PC)
# trace blocks with customized callback
mu.hook_add(UC_HOOK_BLOCK, __hook_callback)
# emulate one instruction. since pc was modified to point to an unmapped
# area, this is expected to fail
with self.assertRaises(UcError) as raisedEx:
mu.emu_start(BASE_ADDRESS, BASE_ADDRESS + len(THUMB_CODE), count=1)
self.assertEqual(UC_ERR_FETCH_UNMAPPED, raisedEx.exception.errno)
# the block callback set PC to 0xffffffff, so at this point, the PC
# value should be 0xffffffff.
self.assertEqual(TARGET_PC, mu.reg_read(UC_ARM_REG_PC) | 0b1)
if __name__ == '__main__':
regress.main()
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