Go buy yourself some Name Brand rear view mirror adhesive,& follow the directions to a T Don't take any shortcuts.
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you will probably have to replace the complete mirror, cable and all.
REMOVE SQUARE PLASTIC PLATE(I USED A STANLEY BLADE)TO REVEAL 4 XPLY SCREWS ,NO NEED TO REMOVE JUST SLACKEN THEM AND PULL MIRROR YOURS T,C U/K
Not knowing which mirror on what vehicle, many glass shops can replace the mirror if that is all that is broken.
you take te old one out
I expect that you can buy the mirror online but I had mine fixed at a local glass shop. They purchased or cut a mirror to fit and they glued it over the cracked one.