booting.
After assembling the post FP processing callback branch call
sync_icache() if CPU_SA110 is defined.
Return a valid signal code when raising a SIGFPE exception so
the cause of the SIGFPE can be determined.
Added the functions arm_fpe_getcontext() and arm_fpe_setcontext()
to obtain the FP context in a FPE independant form for the ptrace()
syscall.