tree cb2816ad87e3917b4d400660d8cc3025be373f1d
parent ac9ad83bc318635ed7496e9dff30beaa522eaec7
author Paul Burton <paul.burton@imgtec.com> 1422619777 +0000
committer Ralf Baechle <ralf@linux-mips.org> 1427481767 +0100

MIPS: disable FPU if the mode is unsupported

The expected semantics of __enable_fpu are for the FPU to be enabled
in the given mode if possible, otherwise for the FPU to be left
disabled and SIGFPE returned. The FPU was incorrectly being left
enabled in cases where the desired value for FR was unavailable.
Without ensuring the FPU is disabled in this case, it would be
possible for userland to go on to execute further FP instructions
natively in the incorrect mode, rather than those instructions being
trapped & emulated as they need to be.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9167/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>