1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 /*
  26  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29 
  30 #pragma weak __fegetround = fegetround
  31 #pragma weak __fesetround = fesetround
  32 
  33 #pragma weak fegetround96 = __fegetround
  34 
  35 #include <fenv.h>
  36 #include <ucontext.h>
  37 #include <thread.h>
  38 #include "fex_handler.h"
  39 #include "fenv_inlines.h"
  40 
  41 #if defined(__i386) && !defined(__amd64)
  42 #include <float.h>
  43 #endif
  44 
  45 int fegetround(void)
  46 {
  47         unsigned long   fsr;
  48 
  49         __fenv_getfsr(&fsr);
  50         return (int)__fenv_get_rd(fsr);
  51 }
  52 
  53 int fesetround(int r)
  54 {
  55         unsigned long   fsr;
  56 
  57         if (r & ~3)
  58                 return -1;
  59         __fenv_getfsr(&fsr);
  60         __fenv_set_rd(fsr, r);
  61         __fenv_setfsr(&fsr);
  62 #if defined(__i386) && !defined(__amd64)
  63         FLT_ROUNDS = (0x2D >> (r << 1)) & 3;    /* 0->1, 1->3, 2->2, 3->0 */
  64 #endif
  65         return 0;
  66 }
  67 
  68 int fesetround96(int r)
  69 {
  70         unsigned long   fsr;
  71 
  72         if (r & ~3)
  73                 return 0;
  74         __fenv_getfsr(&fsr);
  75         __fenv_set_rd(fsr, r);
  76         __fenv_setfsr(&fsr);
  77 #if defined(__i386) && !defined(__amd64)
  78         FLT_ROUNDS = (0x2D >> (r << 1)) & 3;    /* 0->1, 1->3, 2->2, 3->0 */
  79 #endif
  80         return 1;
  81 }