1 /* Store current floating-point environment.
2 Copyright (C) 1997-2021 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
__fegetenv(fenv_t * envp)22 __fegetenv (fenv_t *envp)
23 {
24 unsigned long int fpcr;
25 unsigned long int swcr;
26
27 /* Get status from software and hardware. Note that we don't need an
28 excb because the callsys is an implied trap barrier. */
29 swcr = __ieee_get_fp_control ();
30 __asm__ __volatile__ ("mf_fpcr %0" : "=f" (fpcr));
31
32 /* Merge the two bits of information. */
33 *envp = ((fpcr & FPCR_ROUND_MASK) | (swcr & SWCR_ALL_MASK));
34
35 /* Success. */
36 return 0;
37 }
38
39 #include <shlib-compat.h>
40 #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
41 strong_alias (__fegetenv, __old_fegetenv)
42 compat_symbol (libm, __old_fegetenv, fegetenv, GLIBC_2_1);
43 #endif
44
45 libm_hidden_def (__fegetenv)
46 versioned_symbol (libm, __fegetenv, fegetenv, GLIBC_2_2);
47 libm_hidden_ver(__fegetenv, fegetenv)
48