mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
57 lines
2.0 KiB
C
57 lines
2.0 KiB
C
/* Install given floating-point environment.
|
|
Copyright (C) 1997,99,2000,01,02 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Richard Henderson <rth@tamu.edu>, 1997
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <fenv_libc.h>
|
|
|
|
int
|
|
__fesetenv (const fenv_t *envp)
|
|
{
|
|
unsigned long int fpcr;
|
|
fenv_t env;
|
|
|
|
/* Magic encoding of default values: high bit set (never possible for a
|
|
user-space address) is not indirect. And we don't even have to get
|
|
rid of it since we mask things around just below. */
|
|
if ((long int) envp >= 0)
|
|
env = *envp;
|
|
else
|
|
env = (unsigned long int) envp;
|
|
|
|
/* Reset the rounding mode with the hardware fpcr. Note that the following
|
|
system call is an implied trap barrier for our modification. */
|
|
__asm__ __volatile__ ("excb; mf_fpcr %0" : "=f" (fpcr));
|
|
fpcr = (fpcr & ~FPCR_ROUND_MASK) | (env & FPCR_ROUND_MASK);
|
|
__asm__ __volatile__ ("mt_fpcr %0" : : "f" (fpcr));
|
|
|
|
/* Reset the exception status and mask with the kernel's FP code. */
|
|
__ieee_set_fp_control (env & SWCR_ALL_MASK);
|
|
|
|
/* Success. */
|
|
return 0;
|
|
}
|
|
|
|
#include <shlib-compat.h>
|
|
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
|
|
strong_alias (__fesetenv, __old_fesetenv)
|
|
compat_symbol (libm, __old_fesetenv, fesetenv, GLIBC_2_1);
|
|
#endif
|
|
|
|
libm_hidden_ver (__fesetenv, fesetenv)
|
|
versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);
|