91 lines
2.9 KiB
Python
Executable File
91 lines
2.9 KiB
Python
Executable File
#!/usr/bin/env python
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# reg_write() can't modify PC from within trace callbacks
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# issue #210
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from __future__ import print_function
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from unicorn import *
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from unicorn.arm_const import *
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import regress
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BASE_ADDRESS = 0x10000000
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# sub sp, #0xc
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THUMB_CODE = "\x83\xb0" * 5
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# callback for tracing instructions
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def hook_code(uc, address, size, user_data):
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print(">>> Tracing instruction at 0x%x, instruction size = %u" % (address, size))
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mu = user_data
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print(">>> Setting PC to 0xffffffff")
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mu.reg_write(UC_ARM_REG_PC, 0xffffffff)
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# callback for tracing basic blocks
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def hook_block(uc, address, size, user_data):
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print(">>> Tracing basic block at 0x%x, block size = 0x%x" %(address, size))
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mu = user_data
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print(">>> Setting PC to 0xffffffff")
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mu.reg_write(UC_ARM_REG_PC, 0xffffffff)
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class CallBackPCTest(regress.RegressTest):
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def test_instruction_trace(self):
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try:
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# initialize emulator in ARM's Thumb mode
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mu = Uc(UC_ARCH_ARM, UC_MODE_THUMB)
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# map some memory
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mu.mem_map(BASE_ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(BASE_ADDRESS, THUMB_CODE)
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# setup stack
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mu.reg_write(UC_ARM_REG_SP, BASE_ADDRESS + 2 * 1024 * 1024)
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# tracing all instructions with customized callback
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mu.hook_add(UC_HOOK_CODE, hook_code, user_data=mu)
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# emulate one instruction
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mu.emu_start(BASE_ADDRESS, BASE_ADDRESS + len(THUMB_CODE), count=1)
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# the instruction trace callback set PC to 0xffffffff, so at this
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# point, the PC value should be 0xffffffff.
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pc = mu.reg_read(UC_ARM_REG_PC)
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self.assertEqual(pc, 0xffffffff, "PC not set to 0xffffffff by instruction trace callback")
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except UcError as e:
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self.assertFalse(0, "ERROR: %s" % e)
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def test_block_trace(self):
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try:
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# initialize emulator in ARM's Thumb mode
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mu = Uc(UC_ARCH_ARM, UC_MODE_THUMB)
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# map some memory
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mu.mem_map(BASE_ADDRESS, 2 * 1024 * 1024)
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# write machine code to be emulated to memory
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mu.mem_write(BASE_ADDRESS, THUMB_CODE)
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# setup stack
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mu.reg_write(UC_ARM_REG_SP, BASE_ADDRESS + 2 * 1024 * 1024)
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# trace blocks with customized callback
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mu.hook_add(UC_HOOK_BLOCK, hook_block, user_data=mu)
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# emulate one instruction
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mu.emu_start(BASE_ADDRESS, BASE_ADDRESS + len(THUMB_CODE), count=1)
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# the block callback set PC to 0xffffffff, so at this point, the PC
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# value should be 0xffffffff.
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pc = mu.reg_read(UC_ARM_REG_PC)
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self.assertEqual(pc, 0xffffffff, "PC not set to 0xffffffff by block callback")
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except UcError as e:
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self.assertFalse(0, "ERROR: %s" % e)
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if __name__ == '__main__':
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regress.main()
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