1 /* Store current floating-point environment and clear exceptions.
2 Copyright (C) 1997-2025 Free Software Foundation, Inc.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <fenv.h>
19
20 int
feholdexcept(fenv_t * envp)21 feholdexcept (fenv_t *envp)
22 {
23 fexcept_t fpcr, fpsr;
24
25 /* Store the environment. */
26 #ifdef __mcoldfire__
27 __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (envp->__control_register));
28 __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (envp->__status_register));
29 __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (envp->__instruction_address));
30 #else
31 __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*envp));
32 #endif
33
34 /* Now clear all exceptions. */
35 fpsr = envp->__status_register & ~FE_ALL_EXCEPT;
36 __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr));
37 /* And set all exceptions to non-stop. */
38 fpcr = envp->__control_register & ~(FE_ALL_EXCEPT << 6);
39 __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr));
40
41 return 0;
42 }
43