example/symbol_exec/single_instr.py


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# Minimalist Symbol Exec example
from miasm2.core.bin_stream import bin_stream_str
from miasm2.ir.symbexec import SymbolicExecutionEngine
from miasm2.analysis.machine import Machine
from miasm2.core.locationdb import LocationDB

START_ADDR = 0
machine = Machine("x86_32")
loc_db = LocationDB()

# Assemble and disassemble a MOV
## Ensure that attributes 'offset' and 'l' are set
line = machine.mn.fromstring("MOV EAX, EBX", loc_db, 32)
asm = machine.mn.asm(line)[0]

# Get back block
bin_stream = bin_stream_str(asm)
mdis = machine.dis_engine(bin_stream, loc_db=loc_db)
mdis.lines_wd = 1
asm_block = mdis.dis_block(START_ADDR)

# Translate ASM -> IR
ira = machine.ira(mdis.loc_db)
ira.add_block(asm_block)

# Instanciate a Symbolic Execution engine with default value for registers
symb = SymbolicExecutionEngine(ira)

# Emulate one IR basic block
## Emulation of several basic blocks can be done through .emul_ir_blocks
cur_addr = symb.run_at(START_ADDR)

# Modified elements
print 'Modified registers:'
symb.dump(mems=False)
print 'Modified memory (should be empty):'
symb.dump(ids=False)

# Check final status
eax, ebx = ira.arch.regs.EAX, ira.arch.regs.EBX
assert symb.symbols[eax] == ebx
assert eax in symb.symbols