mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-28 11:57:28 +00:00
b32428bbc5
the denormal/unnormal trap, is not a standard IEEE trap. We did not exclude it from being returned by fpgetmask(), nor did we make sure that fpsetmask() didn't clobber it. Since the non-IEEE trap is not part of fp_except_t, users of ifpgetmask()/fpsetmask() would be confronted with unexpected behaviour, one of which is a SIGFPE for denormal/unnormal FP results. This commit makes sure that we don't leak the denormal/unnormal mask bit in fp_except_t and also that we don't clobber it.
45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
/*-
|
|
* Copyright (c) 2001 Doug Rabson
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/types.h>
|
|
#include <ieeefp.h>
|
|
|
|
fp_except_t
|
|
fpsetmask(fp_except_t mask)
|
|
{
|
|
u_int64_t fpsr;
|
|
u_int64_t oldmask;
|
|
|
|
__asm __volatile("mov %0=ar.fpsr" : "=r" (fpsr));
|
|
oldmask = ~fpsr & 0x3d;
|
|
fpsr = (fpsr & ~0x3d) | (~mask & 0x3d);
|
|
__asm __volatile("mov ar.fpsr=%0" :: "r" (fpsr));
|
|
return (oldmask);
|
|
}
|