LyScript获取上一条与下一条汇编指令的方法详解

from LyScript32 import MyDebug

# 获取当前EIP指令的下一条指令
def get_disasm_next(dbg,eip):
    next = 0

    # 检查当前内存地址是否被下了绊子
    check_breakpoint = dbg.check_breakpoint(eip)

    # 说明存在断点，如果存在则这里就是一个字节了
    if check_breakpoint == True:

        # 接着判断当前是否是EIP，如果是EIP则需要使用原来的字节
        local_eip = dbg.get_register("eip")

        # 说明是EIP并且命中了断点
        if local_eip == eip:
            dis_size = dbg.get_disasm_operand_size(eip)
            next = eip + dis_size
            next_asm = dbg.get_disasm_one_code(next)
            return next_asm
        else:
            next = eip + 1
            next_asm = dbg.get_disasm_one_code(next)
            return next_asm
        return None

    # 不是则需要获取到原始汇编代码的长度
    elif check_breakpoint == False:
        # 得到当前指令长度
        dis_size = dbg.get_disasm_operand_size(eip)
        next = eip + dis_size
        next_asm = dbg.get_disasm_one_code(next)
        return next_asm
    else:
        return None

if __name__ == "__main__":
    dbg = MyDebug()
    dbg.connect()

    eip = dbg.get_register("eip")

    next = get_disasm_next(dbg,eip)
    print("下一条指令: {}".format(next))

    prev = get_disasm_next(dbg,12391436)
    print("下一条指令: {}".format(prev))

    dbg.close()

from LyScript32 import MyDebug

# 获取当前EIP指令的上一条指令
def get_disasm_prev(dbg,eip):
    prev_dasm = None
    # 得到当前汇编指令
    local_disasm = dbg.get_disasm_one_code(eip)

    # 只能向上扫描10行
    eip = eip - 10
    disasm = dbg.get_disasm_code(eip,10)

    # 循环扫描汇编代码
    for index in range(0,len(disasm)):
        # 如果找到了,就取出他的上一个汇编代码
        if disasm[index].get("opcode") == local_disasm:
            prev_dasm = disasm[index-1].get("opcode")
            break

    return prev_dasm

if __name__ == "__main__":
    dbg = MyDebug()
    dbg.connect()

    eip = dbg.get_register("eip")

    next = get_disasm_prev(dbg,eip)
    print("上一条指令: {}".format(next))

    dbg.close()