1  /* Raise given exceptions.
       2     Copyright (C) 1997-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <fenv_libc.h>
      20  
      21  int
      22  __feraiseexcept (int excepts)
      23  {
      24    fenv_union_t u;
      25  
      26    /* Raise exceptions represented by EXCEPTS.  It is the responsibility of
      27       the OS to ensure that if multiple exceptions occur they are fed back
      28       to this process in the proper way; this can happen in hardware,
      29       anyway (in particular, inexact with overflow or underflow). */
      30  
      31    /* Get the current state.  */
      32    u.fenv = fegetenv_register ();
      33  
      34    /* Add the exceptions */
      35    u.l = (u.l
      36  	 | (excepts & FPSCR_STICKY_BITS)
      37  	 /* Turn FE_INVALID into FE_INVALID_SOFTWARE.  */
      38  	 | (excepts >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
      39  	    & FE_INVALID_SOFTWARE));
      40  
      41    /* Store the new status word (along with the rest of the environment),
      42       triggering any appropriate exceptions.  */
      43    fesetenv_register (u.fenv);
      44  
      45    if ((excepts & FE_INVALID))
      46      {
      47        /* For some reason, some PowerPC chips (the 601, in particular)
      48  	 don't have FE_INVALID_SOFTWARE implemented.  Detect this
      49  	 case and raise FE_INVALID_SNAN instead.  */
      50        u.fenv = fegetenv_register ();
      51        if ((u.l & FE_INVALID) == 0)
      52  	set_fpscr_bit (FPSCR_VXSNAN);
      53      }
      54  
      55    /* Success.  */
      56    return 0;
      57  }
      58  
      59  #include <shlib-compat.h>
      60  #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
      61  strong_alias (__feraiseexcept, __old_feraiseexcept)
      62  compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
      63  #endif
      64  
      65  libm_hidden_def (__feraiseexcept)
      66  libm_hidden_ver (__feraiseexcept, feraiseexcept)
      67  versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);