1  /* Store current representation for 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.h>
      20  #include <unistd.h>
      21  #include <ldsodefs.h>
      22  #include <dl-procinfo.h>
      23  
      24  
      25  int
      26  __fegetexceptflag (fexcept_t *flagp, int excepts)
      27  {
      28    fexcept_t temp;
      29  
      30    /* Get the current exceptions.  */
      31    __asm__ ("fnstsw %0" : "=m" (*&temp));
      32  
      33    *flagp = temp & excepts & FE_ALL_EXCEPT;
      34  
      35    /* If the CPU supports SSE, we clear the MXCSR as well.  */
      36    if (CPU_FEATURE_USABLE (SSE))
      37      {
      38        unsigned int sse_exc;
      39  
      40        /* Get the current MXCSR.  */
      41        __asm__ ("stmxcsr %0" : "=m" (*&sse_exc));
      42  
      43        *flagp |= sse_exc & excepts & FE_ALL_EXCEPT;
      44      }
      45  
      46    /* Success.  */
      47    return 0;
      48  }
      49  
      50  #include <shlib-compat.h>
      51  #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
      52  strong_alias (__fegetexceptflag, __old_fegetexceptflag)
      53  compat_symbol (libm, __old_fegetexceptflag, fegetexceptflag, GLIBC_2_1);
      54  #endif
      55  
      56  versioned_symbol (libm, __fegetexceptflag, fegetexceptflag, GLIBC_2_2);