(1) Kena, from Malay 'to suffer', marks a non-prototypical passive-like construction, which may simply indicate non-volitional actors.
(2) The 'give' passive is a calque on Hokkien.
Source: Fong 2004: 97
Source: Fong 2004: 97
Source: Fong 2004: 97
Source: Fong 2004: 99