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1/* Install given floating-point environment.
2 Copyright (C) 1997-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Richard Henderson <rth@tamu.edu>, 1997
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library. If not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <fenv_libc.h>
21
22int
23__fesetenv (const fenv_t *envp)
24{
25 unsigned long int fpcr;
26 fenv_t env;
27
28 /* Magic encoding of default values: high bit set (never possible for a
29 user-space address) is not indirect. And we don't even have to get
30 rid of it since we mask things around just below. */
31 if ((long int) envp >= 0)
32 env = *envp;
33 else
34 env = (unsigned long int) envp;
35
36 /* Reset the rounding mode with the hardware fpcr. Note that the following
37 system call is an implied trap barrier for our modification. */
38 __asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr));
39 fpcr = (fpcr & ~FPCR_ROUND_MASK) | (env & FPCR_ROUND_MASK);
40 __asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr));
41
42 /* Reset the exception status and mask with the kernel's FP code. */
43 __ieee_set_fp_control (env & SWCR_ALL_MASK);
44
45 /* Success. */
46 return 0;
47}
48
49#include <shlib-compat.h>
50#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
51strong_alias (__fesetenv, __old_fesetenv)
52compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
53#endif
54
55libm_hidden_def (__fesetenv)
56libm_hidden_ver (__fesetenv, fesetenv)
57versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);
58

Warning: That file was not part of the compilation database. It may have many parsing errors.