fpsetsticky_vfp.c revision 264696
1183267Sjkoshy/* 2174397Sjkoshy * Copyright (C) 2014 Andrew Turner 3145256Sjkoshy * All rights reserved. 4145256Sjkoshy * 5174397Sjkoshy * Redistribution and use in source and binary forms, with or without 6174397Sjkoshy * modification, are permitted provided that the following conditions 7174397Sjkoshy * are met: 8145256Sjkoshy * 1. Redistributions of source code must retain the above copyright 9145256Sjkoshy * notice, this list of conditions and the following disclaimer. 10145256Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 11145256Sjkoshy * notice, this list of conditions and the following disclaimer in the 12145256Sjkoshy * documentation and/or other materials provided with the distribution. 13145256Sjkoshy * 14145256Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15145256Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16145256Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17145256Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18145256Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19145256Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20145256Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21145256Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22145256Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23145256Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24145256Sjkoshy * SUCH DAMAGE. 25145256Sjkoshy * 26145256Sjkoshy */ 27145256Sjkoshy 28145256Sjkoshy#include <sys/cdefs.h> 29145256Sjkoshy__FBSDID("$FreeBSD: head/lib/libc/arm/gen/fpsetsticky.c 264696 2014-04-20 14:58:14Z andrew $"); 30145256Sjkoshy 31242496Sjimharris#include <sys/types.h> 32145256Sjkoshy#include <ieeefp.h> 33145256Sjkoshy 34145256Sjkoshy#ifdef __weak_alias 35145256Sjkoshy__weak_alias(fpsetsticky,_fpsetsticky) 36147679Sjkoshy#endif 37145256Sjkoshy 38147679Sjkoshy#define FP_X_MASK (FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP) 39147679Sjkoshy 40150684Sjkoshyfp_except 41150684Sjkoshyfpsetsticky(fp_except except) 42152569Sru{ 43145256Sjkoshy fp_except old, new; 44145256Sjkoshy 45145256Sjkoshy __asm __volatile("vmrs %0, fpscr" : "=&r"(old)); 46145256Sjkoshy new = old & ~(FP_X_MASK); 47145256Sjkoshy new &= ~except; 48145256Sjkoshy __asm __volatile("vmsr fpscr, %0" : : "r"(new)); 49145256Sjkoshy 50145256Sjkoshy return (old & except); 51145256Sjkoshy} 52145256Sjkoshy 53147679Sjkoshy