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/* Store current floating-point environment and clear exceptions.
e500 version.
Copyright (C) 2004-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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>
#include <sysdep.h>
#include <sys/prctl.h>
int
feholdexcept (fenv_t *envp)
{
fenv_union_t u;
INTERNAL_SYSCALL_DECL (err);
int r;
/* Get the current state. */
r = INTERNAL_SYSCALL (prctl, err, 2, PR_GET_FPEXC, &u.l[0]);
if (INTERNAL_SYSCALL_ERROR_P (r, err))
return -1;
u.l[1] = fegetenv_register ();
*envp = u.fenv;
/* Clear everything except for the rounding mode and trapping to the
kernel. */
u.l[0] &= ~(PR_FP_EXC_DIV
| PR_FP_EXC_OVF
| PR_FP_EXC_UND
| PR_FP_EXC_RES
| PR_FP_EXC_INV);
u.l[1] &= SPEFSCR_FRMC | (SPEFSCR_ALL_EXCEPT_ENABLE & ~SPEFSCR_FINXE);
/* Put the new state in effect. */
fesetenv_register (u.l[1]);
r = INTERNAL_SYSCALL (prctl, err, 2, PR_SET_FPEXC,
u.l[0] | PR_FP_EXC_SW_ENABLE);
if (INTERNAL_SYSCALL_ERROR_P (r, err))
return -1;
return 0;
}
libm_hidden_def (feholdexcept)
|
