Thunking is the process of calling 16-bit code from 32-bit code and vice versa. Thunking consists of applying the CRMA to convert from one form of address to the other and making any stack parameter adjustments either by padding 16-bit operands to 32-bit with leading zeros (16- to 31-bit conversion) or truncating the padded 32-bit value to 16 bits (32- to 16-bit conversion).

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