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 feclearexcept = __feclearexcept
  31 #pragma weak feraiseexcept = __feraiseexcept
  32 #pragma weak fetestexcept = __fetestexcept
  33 #pragma weak fegetexceptflag = __fegetexceptflag
  34 #pragma weak fesetexceptflag = __fesetexceptflag
  35 
  36 #pragma weak feclearexcept96 = __feclearexcept
  37 #pragma weak feraiseexcept96 = __feraiseexcept
  38 #pragma weak fetestexcept96 = __fetestexcept
  39 #pragma weak fegetexceptflag96 = __fegetexceptflag
  40 #pragma weak fesetexceptflag96 = __fesetexceptflag
  41 
  42 #include "fenv_synonyms.h"
  43 #include <fenv.h>
  44 #include <sys/ieeefp.h>
  45 #include <ucontext.h>
  46 #include <thread.h>
  47 #include "fex_handler.h"
  48 #include "fenv_inlines.h"
  49 
  50 
  51 int feclearexcept(int e)
  52 {
  53         unsigned long   fsr;
  54 
  55         __fenv_getfsr(&fsr);
  56         __fenv_set_ex(fsr, __fenv_get_ex(fsr) & ~e);
  57         __fenv_setfsr(&fsr);
  58         if (fex_get_log())
  59                 __fex_update_te();
  60         return 0;
  61 }
  62 
  63 /*
  64 *  note - __fex_hdlr depends on fetestexcept following feraiseexcept
  65 */
  66 int feraiseexcept(int e)
  67 {
  68         volatile double t;
  69         unsigned long   fsr;
  70 
  71         if (e & FE_INVALID) {
  72                 t = 0.0;
  73                 t /= 0.0;
  74         }
  75         if (e & FE_DIVBYZERO) {
  76                 t = 1.0e300;
  77                 t /= 0.0;
  78         }
  79         if (e & FE_OVERFLOW) {
  80                 /* if overflow is not trapped, avoid raising inexact */
  81                 __fenv_getfsr(&fsr);
  82                 if (!(__fenv_get_te(fsr) & (1 << fp_trap_overflow))) {
  83                         __fenv_set_ex(fsr, __fenv_get_ex(fsr) | FE_OVERFLOW);
  84                         __fenv_setfsr(&fsr);
  85                 }
  86                 else {
  87                         t = 1.0e300;
  88                         t *= 1.0e300;
  89                 }
  90         }
  91         if (e & FE_UNDERFLOW) {
  92                 /* if underflow is not trapped, avoid raising inexact */
  93                 __fenv_getfsr(&fsr);
  94                 if (!(__fenv_get_te(fsr) & (1 << fp_trap_underflow))) {
  95                         __fenv_set_ex(fsr, __fenv_get_ex(fsr) | FE_UNDERFLOW);
  96                         __fenv_setfsr(&fsr);
  97                 }
  98                 else {
  99                         t = 1.0e-307;
 100                         t -= 1.001e-307;
 101                 }
 102         }
 103         if (e & FE_INEXACT) {
 104                 t = 1.0e300;
 105                 t += 1.0e-307;
 106         }
 107         return 0;
 108 }
 109 
 110 int fetestexcept(int e)
 111 {
 112         unsigned long   fsr;
 113 
 114         __fenv_getfsr(&fsr);
 115         return (int)__fenv_get_ex(fsr) & e;
 116 }
 117 
 118 int fegetexceptflag(fexcept_t *p, int e)
 119 {
 120         unsigned long   fsr;
 121 
 122         __fenv_getfsr(&fsr);
 123         *p = (int)__fenv_get_ex(fsr) & e;
 124         return 0;
 125 }
 126 
 127 int fesetexceptflag(const fexcept_t *p, int e)
 128 {
 129         unsigned long   fsr;
 130 
 131         __fenv_getfsr(&fsr);
 132         __fenv_set_ex(fsr, (((int)__fenv_get_ex(fsr) & ~e) | (*p & e)) &
 133                 FE_ALL_EXCEPT);
 134         __fenv_setfsr(&fsr);
 135         if (fex_get_log())
 136                 __fex_update_te();
 137         return 0;
 138 }