summaryrefslogtreecommitdiff
path: root/ports/sysdeps/hppa/fpu/feholdexcpt.c
blob: b12138720f5e4622aa1a0fe6a5e2649fe3db8f4a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
/* Store current floating-point environment and clear exceptions.
   Copyright (C) 2000-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by David Huggins-Daines <dhd@debian.org>, 2000

   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.h>
#include <string.h>

int
feholdexcept (fenv_t *envp)
{
  union { unsigned long long buf[4]; fenv_t env; } clear;
  unsigned long long *bufptr;

  /* Store the environment.  */
  bufptr = clear.buf;
  __asm__ (
	   "fstd,ma %%fr0,8(%1)\n"
	   : "=m" (clear), "+r" (bufptr) : : "%r0");
  memcpy (envp, &clear.env, sizeof (fenv_t));

  /* Clear exception queues */
  memset (clear.env.__exception, 0, sizeof (clear.env.__exception));
  /* And set all exceptions to non-stop.  */
  clear.env.__status_word &= ~FE_ALL_EXCEPT;
  /* Now clear all flags  */
  clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27);

  /* Load the new environment. Note: fr0 must load last to enable T-bit
     Thus we start bufptr at the end and work backwards */
  bufptr = (unsigned long long *)((unsigned int)(clear.buf) + sizeof(unsigned int)*4);
  __asm__ (
	   "fldd,mb -8(%0),%%fr0\n"
	   : : "r" (bufptr), "m" (clear) : "%r0");

  return 0;
}

libm_hidden_def (feholdexcept)