Defined in rt_fp.h, the __rt_fp_status_addr() function returns the address of the floating-point status word.
By default, the floating-point status word resides in __user_libspace.
This function is not part of the C library standard, but the ARM C library supports it as an extension.
If __rt_fp_status_addr() is not defined, the default implementation from the C library is used. The value is initialized when __rt_lib_init() calls _fp_init(). The constants for the status word are listed in fenv.h. The default floating-point status is 0.
The address of the floating-point status word.