3.3.3.4 How Do I Position Functions At An Address I Nominate?

The easiest way to do this is to make the functions absolute by using the __at(address) construct, (see 5.8.3 Changing the Default Function Allocation), but you might consider also placing the variable in a unique section (see 5.15.3 Changing and Linking the Allocated Section). This means that the address you specify is used in preference to the function’s symbol in generated code.