uclibc-ng/libm/m68k/feenablxcpt.c

/* Enable floating-point exceptions.
   Copyright (C) 2000-2025 Free Software Foundation, Inc.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#include <fenv.h>

int
feenableexcept (int excepts)
{
  unsigned int new_exc, old_exc;

  /* Get the current control register contents.  */
  __asm__ ("fmove%.l %!,%0" : "=dm" (new_exc));

  old_exc = (new_exc >> 6) & FE_ALL_EXCEPT;

  excepts &= FE_ALL_EXCEPT;

  new_exc |= excepts << 6;
  __asm__ ("fmove%.l %0,%!" : : "dm" (new_exc));

  return old_exc;
}