1 | /* Set floating-point environment exception handling. |
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_libc.h> |
20 | |
21 | int |
22 | __fesetexceptflag (const fexcept_t *flagp, int excepts) |
23 | { |
24 | fenv_union_t u, n; |
25 | fexcept_t flag; |
26 | |
27 | /* Get the current state. */ |
28 | u.fenv = fegetenv_register (); |
29 | |
30 | /* Ignore exceptions not listed in 'excepts'. */ |
31 | flag = *flagp & excepts; |
32 | |
33 | /* Replace the exception status */ |
34 | int excepts_mask = FPSCR_STICKY_BITS & excepts; |
35 | if ((excepts & FE_INVALID) != 0) |
36 | excepts_mask |= FE_ALL_INVALID; |
37 | n.l = ((u.l & ~excepts_mask) |
38 | | (flag & FPSCR_STICKY_BITS) |
39 | /* Turn FE_INVALID into FE_INVALID_SOFTWARE. */ |
40 | | (flag >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT)) |
41 | & FE_INVALID_SOFTWARE)); |
42 | |
43 | /* Store the new status word (along with the rest of the environment). |
44 | This may cause floating-point exceptions if the restored state |
45 | requests it. */ |
46 | if (n.l != u.l) |
47 | { |
48 | if (n.l & fenv_exceptions_to_reg (excepts)) |
49 | /* Setting the exception flags may trigger a trap. ISO C 23 ยง 7.6.4.4 |
50 | does not allow it. */ |
51 | return -1; |
52 | |
53 | fesetenv_register (n.fenv); |
54 | } |
55 | |
56 | /* Deal with FE_INVALID_SOFTWARE not being implemented on some chips. */ |
57 | if (flag & FE_INVALID) |
58 | feraiseexcept(FE_INVALID); |
59 | |
60 | /* Success. */ |
61 | return 0; |
62 | } |
63 | |
64 | #include <shlib-compat.h> |
65 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
66 | strong_alias (__fesetexceptflag, __old_fesetexceptflag) |
67 | compat_symbol (libm, __old_fesetexceptflag, fesetexceptflag, GLIBC_2_1); |
68 | #endif |
69 | |
70 | versioned_symbol (libm, __fesetexceptflag, fesetexceptflag, GLIBC_2_2); |
71 | |