1 /* Store current representation for 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.h>
20 #include <unistd.h>
21 #include <ldsodefs.h>
22 #include <dl-procinfo.h>
23
24
25 int
__fegetexceptflag(fexcept_t * flagp,int excepts)26 __fegetexceptflag (fexcept_t *flagp, int excepts)
27 {
28 fexcept_t temp;
29
30 /* Get the current exceptions. */
31 __asm__ ("fnstsw %0" : "=m" (*&temp));
32
33 *flagp = temp & excepts & FE_ALL_EXCEPT;
34
35 /* If the CPU supports SSE, we clear the MXCSR as well. */
36 if (CPU_FEATURE_USABLE (SSE))
37 {
38 unsigned int sse_exc;
39
40 /* Get the current MXCSR. */
41 __asm__ ("stmxcsr %0" : "=m" (*&sse_exc));
42
43 *flagp |= sse_exc & excepts & FE_ALL_EXCEPT;
44 }
45
46 /* Success. */
47 return 0;
48 }
49
50 #include <shlib-compat.h>
51 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
52 strong_alias (__fegetexceptflag, __old_fegetexceptflag)
53 compat_symbol (libm, __old_fegetexceptflag, fegetexceptflag, GLIBC_2_1);
54 #endif
55
56 versioned_symbol (libm, __fegetexceptflag, fegetexceptflag, GLIBC_2_2);
57