static int protected_restore_fp_context32(struct sigcontext32 __user *sc,
unsigned used_math)
{
int err, tmp __maybe_unused;
bool restore_msa = cpu_has_msa && (used_math & USEDMATH_MSA);
while (1) {
lock_fpu_owner();
if (is_fpu_owner()) {
err = restore_fp_context32(sc);
if (restore_msa && !err) {
enable_msa();
err = _restore_msa_context32(sc);
} else {
/* signal handler may have used MSA */
disable_msa();
}
unlock_fpu_owner();
} else {
unlock_fpu_owner();
err = copy_fp_from_sigcontext32(sc);
if (restore_msa && !err)
err = copy_msa_from_sigcontext32(sc);
}
if (likely(!err))
break;
/* touch the sigcontext and try again */
err = __get_user(tmp, &sc->sc_fpregs[0]) |
__get_user(tmp, &sc->sc_fpregs[31]) |
__get_user(tmp, &sc->sc_fpc_csr);
if (err)
break; /* really bad sigcontext */
}
return err;
}
static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
{
int err, tmp __maybe_unused;
while (1) {
lock_fpu_owner();
if (is_fpu_owner()) {
err = restore_fp_context32(sc);
unlock_fpu_owner();
} else {
unlock_fpu_owner();
err = copy_fp_from_sigcontext32(sc);
}
if (likely(!err))
break;
/* touch the sigcontext and try again */
err = __get_user(tmp, &sc->sc_fpregs[0]) |
__get_user(tmp, &sc->sc_fpregs[31]) |
__get_user(tmp, &sc->sc_fpc_csr);
if (err)
break; /* really bad sigcontext */
}
return err;
}
