RTEMS CPU Architecture Supplement
RTEMS assumes that arguments are placed in the
general purpose registers with the first argument in
register 3 (r3), the second argument in general purpose
register 4 (r4), and so forth until the seventh
argument is in general purpose register 10 (r10).
If there are more than seven arguments, then subsequent arguments
are placed on the program stack. The following pseudo-code
illustrates the typical sequence used to call a RTEMS directive
with three (3) arguments:
load third argument into r5 load second argument into r4 load first argument into r3 invoke directive
RTEMS CPU Architecture Supplement
Copyright © 1988-2004 OAR Corporation