[En-Nut-Discussion] NutOS relocatable?
nategoose at gmail.com
Thu Apr 7 19:25:29 CEST 2011
I believe that the way relocatable code usually works in C like psudo-code
CODE_BASE = PC & MODULE_CODE_MASK ; // Calculates the base address for
the current module from the Program Counter's current value
ADDR = CODE_BASE | FUNC_OFFSET; // Calculate the address of the
desired function in the currently running code
call ADDR; // Call the
function at it's current location by function pointer stored in a register
I don't think that there is any real reason that NutOS couldn't run this
way, and I
don't know of any compiler limitations for this except that the compiler may
an underlying OS's page size when generating the MODULE_CODE_MASK.
I don't know how to go about telling gcc how to do this correctly, though.
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