Test for endogeneity in simultaneous equation model (SEM)

Hi,

May I know how to test for endogeneity in simultaneous equation model (SEM) in Stata 12.0 for the following equations:

Disclosure = Board diversity + Performance + Leverage + Size (1)
Performance = Disclosure + Leverage + Size + other control variable (2)

I am new to Stata, hence explanation in simple words and 'step-by-step Stata instructions' are very much appreciated.

Thank you.