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 /*
  27  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 
  31 #pragma weak __fegetround = fegetround
  32 #pragma weak __fesetround = fesetround
  33 
  34 #pragma weak fegetround96 = __fegetround
  35 
  36 #include <fenv.h>
  37 #include <ucontext.h>
  38 #include <thread.h>
  39 #include "fex_handler.h"
  40 #include "fenv_inlines.h"
  41 
  42 #if defined(__i386) && !defined(__amd64)
  43 #include <float.h>
  44 #endif
  45 
  46 int
  47 fegetround(void)
  48 {
  49         unsigned long fsr;
  50 
  51         __fenv_getfsr(&fsr);
  52         return ((int)__fenv_get_rd(fsr));
  53 }
  54 
  55 int
  56 fesetround(int r)
  57 {
  58         unsigned long fsr;
  59 
  60         if (r & ~3)
  61                 return (-1);
  62 
  63         __fenv_getfsr(&fsr);
  64         __fenv_set_rd(fsr, r);
  65         __fenv_setfsr(&fsr);
  66 #if defined(__i386) && !defined(__amd64)
  67         FLT_ROUNDS = (0x2D >> (r << 1)) & 3;    /* 0->1, 1->3, 2->2, 3->0 */
  68 #endif
  69         return (0);
  70 }
  71 
  72 int
  73 fesetround96(int r)
  74 {
  75         unsigned long fsr;
  76 
  77         if (r & ~3)
  78                 return (0);
  79 
  80         __fenv_getfsr(&fsr);
  81         __fenv_set_rd(fsr, r);
  82         __fenv_setfsr(&fsr);
  83 #if defined(__i386) && !defined(__amd64)
  84         FLT_ROUNDS = (0x2D >> (r << 1)) & 3;    /* 0->1, 1->3, 2->2, 3->0 */
  85 #endif
  86         return (1);
  87 }