1 | /* Store current floating-point environment and clear exceptions. |
2 | Copyright (C) 1997-2024 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 | |
21 | int |
22 | __feholdexcept (fenv_t *envp) |
23 | { |
24 | fexcept_t fpcr, fpsr; |
25 | |
26 | /* Store the environment. */ |
27 | #ifdef __mcoldfire__ |
28 | __asm__ ("fmove%.l %/fpcr,%0" : "=dm" (envp->__control_register)); |
29 | __asm__ ("fmove%.l %/fpsr,%0" : "=dm" (envp->__status_register)); |
30 | __asm__ ("fmove%.l %/fpiar,%0" : "=dm" (envp->__instruction_address)); |
31 | #else |
32 | __asm__ ("fmovem%.l %/fpcr/%/fpsr/%/fpiar,%0" : "=m" (*envp)); |
33 | #endif |
34 | |
35 | /* Now clear all exceptions. */ |
36 | fpsr = envp->__status_register & ~FE_ALL_EXCEPT; |
37 | __asm__ __volatile__ ("fmove%.l %0,%/fpsr" : : "dm" (fpsr)); |
38 | /* And set all exceptions to non-stop. */ |
39 | fpcr = envp->__control_register & ~(FE_ALL_EXCEPT << 6); |
40 | __asm__ __volatile__ ("fmove%.l %0,%!" : : "dm" (fpcr)); |
41 | |
42 | return 0; |
43 | } |
44 | libm_hidden_def (__feholdexcept) |
45 | weak_alias (__feholdexcept, feholdexcept) |
46 | libm_hidden_weak (feholdexcept) |
47 | |