miasm2.analysis.disasm_cb Namespace Reference

Functions
def	get_ira
def	arm_guess_subcall
def	arm_guess_jump_table
def	guess_multi_cb

Variables
list	guess_funcs = []

Function Documentation

def miasm2.analysis.disasm_cb.arm_guess_jump_table	(		mnemo,
			attrib,
			pool_bin,
			cur_bloc,
			offsets_to_dis,
			symbol_pool
	)

Definition at line 72 of file disasm_cb.py.

    mnemo, attrib, pool_bin, cur_bloc, offsets_to_dis, symbol_pool):
    ira = get_ira(mnemo, attrib)

    jra = ExprId('jra')
    jrb = ExprId('jrb')

    sp = asm_symbol_pool()
    ir_arch = ira(sp)
    ir_arch.add_bloc(cur_bloc)

    ir_blocs = ir_arch.blocs.values()
    for irb in ir_blocs:
        # print 'X'*40
        # print irb
        pc_val = None
        # lr_val = None
        for exprs in irb.irs:
            for e in exprs:
                if e.dst == ir_arch.pc:
                    pc_val = e.src
                # if e.dst == mnemo.regs.LR:
                #    lr_val = e.src
        if pc_val is None:
            continue
        if not isinstance(pc_val, ExprMem):
            continue
        assert(pc_val.size == 32)
        print pc_val
        ad = pc_val.arg
        ad = expr_simp(ad)
        print ad
        res = MatchExpr(ad, jra + jrb, set([jra, jrb]))
        if res is False:
            raise NotImplementedError('not fully functional')
        print res
        if not isinstance(res[jrb], ExprInt):
            raise NotImplementedError('not fully functional')
        base_ad = int(res[jrb].arg)
        print base_ad
        addrs = set()
        i = -1
        max_table_entry = 10000
        max_diff_addr = 0x100000  # heuristic
        while i < max_table_entry:
            i += 1
            try:
                ad = upck32(pool_bin.getbytes(base_ad + 4 * i, 4))
            except:
                break
            if abs(ad - base_ad) > max_diff_addr:
                break
            addrs.add(ad)
        print [hex(x) for x in addrs]

        for ad in addrs:
            offsets_to_dis.add(ad)
            l = symbol_pool.getby_offset_create(ad)
            c = asm_constraint_to(l)
            cur_bloc.addto(c)

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