21.3 Linker-Defined Symbols

The XC-DSC linker defines several symbols that may be used in your C code development. Please see the “MPLAB® XC-DSC Assembler, Linker and Utilities User’s Guide” (DS-50003590) for more information.

A useful address symbol, _PROGRAM_END, is defined in program memory to mark the highest address used by a CODE or PSV section. It should be referenced with the address operator (&) in a built-in function call that accepts the address of an object in program memory. This symbol can be used by applications as an end point for checksum calculations.

For example:

unsigned int end_page, end_offset;
 _prog_addressT big_addr;
end_page = __builtin_tblpage(&_PROGRAM_END);
end_offset = __builtin_tbloffset(&_PROGRAM_END);
_init_prog_address(big_addr, _PROGRAM_END);