The construction here is identical to the "conjunctive participle" construction (see Feature 72 "Nominal and verbal conjunction"). In Tamil and Sinhala the conjunctive participle is clearly a subordinate verb form, but in Sri Lanka Portuguese the conjunctive participle is identical to the bare verb. In Tamil & Sinhala these benefactive/recipient constructions use the conjunctive participle. Thus the fact that this looks like a "true" serial verb construction in Sri Lanka Portuguese may be accidental. In conjunctive participle constructions, the nonfinal verb can usually be replaced by a perfective form, but the perfective does not seem to appear with these benefactive constructions. This is perhaps a weak argument in favour of treating these as serial verb constructions.
Source: Smith 1974-5: 5389
Source: Smith 1974-5: 5426
Source: Smith 1974-5: 1424