bolting down 6x6 post to existing concrete slab

hi,
i am looking to build a pole barn/garage/carport type structure. i have an existing concrete slab i want to attach the 6x6 to. is there anything that is structurally sound enough to attach to existing concrete slab? i do not want to break up the existing slab. i would like to just be able to bolt a post anchor saddle directly to the existing slab.
thanks for any help