> 
> When LD reads in object files (because N_TXTADDR is 4k out) it defines
> the macro TEXT_START such that the 4k is subtracted.  Having done this,
> the code to manipulate relocations and symbols becomes easy.  Everything
> in the loaded object file again has a consistent base address.
>
This is not quite what is done in ld. N_TXTADDR() or TEXT_START() is never
applied to *input* object files. In stead, ld has a set of basic assumptions
on how to handle (relocatable) address references in them, which boils down
to this: all addresses are to be interpreted as referrring to locations as
if the object text segment was loaded at address 0 with the data segment
following immediately.


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