1 /* Raise given exceptions.
2 Copyright (C) 1997-2022 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
__feraiseexcept(int excepts)22 __feraiseexcept (int excepts)
23 {
24 fenv_union_t u;
25
26 /* Raise exceptions represented by EXCEPTS. It is the responsibility of
27 the OS to ensure that if multiple exceptions occur they are fed back
28 to this process in the proper way; this can happen in hardware,
29 anyway (in particular, inexact with overflow or underflow). */
30
31 /* Get the current state. */
32 u.fenv = fegetenv_register ();
33
34 /* Add the exceptions */
35 u.l = (u.l
36 | (excepts & FPSCR_STICKY_BITS)
37 /* Turn FE_INVALID into FE_INVALID_SOFTWARE. */
38 | (excepts >> ((31 - FPSCR_VX) - (31 - FPSCR_VXSOFT))
39 & FE_INVALID_SOFTWARE));
40
41 /* Store the new status word (along with the rest of the environment),
42 triggering any appropriate exceptions. */
43 fesetenv_register (u.fenv);
44
45 if ((excepts & FE_INVALID))
46 {
47 /* For some reason, some PowerPC chips (the 601, in particular)
48 don't have FE_INVALID_SOFTWARE implemented. Detect this
49 case and raise FE_INVALID_SNAN instead. */
50 u.fenv = fegetenv_register ();
51 if ((u.l & FE_INVALID) == 0)
52 set_fpscr_bit (FPSCR_VXSNAN);
53 }
54
55 /* Success. */
56 return 0;
57 }
58
59 #include <shlib-compat.h>
60 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
61 strong_alias (__feraiseexcept, __old_feraiseexcept)
62 compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
63 #endif
64
65 libm_hidden_def (__feraiseexcept)
66 libm_hidden_ver (__feraiseexcept, feraiseexcept)
67 versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
68