RTEMS Porting Guide
The CPU_CONTEXT_FP_SIZE macro is set to the size of the floating point context area. On some CPUs this will not be a "sizeof" because the format of the floating point area is not defined -- only the size is. This is usually on CPUs with a "floating point save context" instruction. In general, though it is easier to define the structure as a "sizeof" operation and define the Context_Control_fp structure to be an area of bytes of the required size in this case.
#define CPU_CONTEXT_FP_SIZE sizeof( Context_Control_fp )
RTEMS Porting Guide
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