This is a major emergency. Just look at the description in the FCOM!
Pitch - Mechanical backup (ouch!)
Roll - Direct Law (no real probs there)
You can only use Manual Pitch Trim to give you the the up and down bits. This is normally considered a temp situation whilst the pnf frantically (calmly and in an orderly fashion!) attempts to re-instate any affected computers.
If that is not possible you are looking at a loooooong straight in approach to atempt to minimse the pitch input requirements (easier said than done). Your stuck with Cat 1 only (personally I would use CAVOK as a yardstick!), a Flap 3 landing (to make life a little easier) and 10 kts on your Vapp (big deal) plus a third or so more runway required.
The trim is powerful and a small movement makes a significant pitch input so try and plan ahead. PF just flies and square root of nothing else. PNF does everything else.
Take off !!!!! if your on the ground - stay on the ground!
Landing - best you can from the above para.
Go Around - V. Difficult but, if absolutely unavoidable, remember that there will be a significant pitch power couple (normally hidden by Normal Law) so the trim use can be minimised.
Dont expect the results to be pretty. The aim of such a 'procedure' is to walk away.