If the functions are reordered, chances are that clone_region_start and clone_region_end would span not all of the required functions and the consequence would be that not all of the required code would be copied to RAM and non-existing code would be called eventually. So the question is: how can I ensure the ordering of the functions?
I don't think there is a good way short of writing a cumbersome linker script. But I don't think that's the right question to ask (or one that would lead to a robust solution). I think a better question to ask is: how can one compute the size of a set of text symbols. The answer to that is also "by writing a linker script," but the solution to that problem is much easier than trying to order all the text symbols. In the linker script for your image, save the dot address in a symbol, say _start, then let the linker define all the other symbols using wildcards, and then save the dot address again, say in _end. The size is then the difference between _start and _end. To compute the value in your program simply declare _start and _end as symbols with the appropriate type (char* or unsigned long) in your program and compute the difference there (or have the linker do the math and define/declare _size analogously). Martin
