minix/lib/libc/arch/arm/hardfloat/fpsetmask.S

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/* $NetBSD: fpsetmask.S,v 1.6 2013/01/11 13:55:26 matt Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __VFP_FP__
#error FPA is not supported anymore
#endif
#include <arm/asm.h>
#include <arm/vfpreg.h>
/*
* Set the current FP exception enable mask
*/
#ifdef WEAK_ALIAS
WEAK_ALIAS(fpsetmask, _fpsetmask)
#define fpsetmask _fpsetmask
#endif
ENTRY(fpsetmask)
and r2, r0, #VFP_FPSCR_CSUM
vmrs r1, fpscr
mov r0, r1, lsr #8 /* Return old mask */
bic r1, r1, #VFP_FPSCR_ESUM
orr r1, r1, r2, lsl #8
vmsr fpscr, r1
mcr p10, 7, r1, c1, c0, 0
and r0, r0, #VFP_FPSCR_CSUM
RET
END(fpsetmask)