1*b02ee2d0Skettenis /* $OpenBSD: fpsetsticky.c,v 1.1 2018/02/28 11:16:54 kettenis Exp $ */
2*b02ee2d0Skettenis /*
3*b02ee2d0Skettenis * Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
4*b02ee2d0Skettenis *
5*b02ee2d0Skettenis * Permission to use, copy, modify, and distribute this software for any
6*b02ee2d0Skettenis * purpose with or without fee is hereby granted, provided that the above
7*b02ee2d0Skettenis * copyright notice and this permission notice appear in all copies.
8*b02ee2d0Skettenis *
9*b02ee2d0Skettenis * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10*b02ee2d0Skettenis * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11*b02ee2d0Skettenis * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12*b02ee2d0Skettenis * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13*b02ee2d0Skettenis * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14*b02ee2d0Skettenis * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15*b02ee2d0Skettenis * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16*b02ee2d0Skettenis */
17*b02ee2d0Skettenis
18*b02ee2d0Skettenis #include <ieeefp.h>
19*b02ee2d0Skettenis #ifdef SOFTFLOAT_FOR_GCC
20*b02ee2d0Skettenis #include "softfloat-for-gcc.h"
21*b02ee2d0Skettenis #endif
22*b02ee2d0Skettenis #include "milieu.h"
23*b02ee2d0Skettenis #include <softfloat.h>
24*b02ee2d0Skettenis
25*b02ee2d0Skettenis #define FP_X_MASK (FP_X_INV | FP_X_DZ | FP_X_OFL | FP_X_UFL | FP_X_IMP)
26*b02ee2d0Skettenis
27*b02ee2d0Skettenis __weak_alias(_fpsetsticky,fpsetsticky);
28*b02ee2d0Skettenis
29*b02ee2d0Skettenis fp_except
fpsetsticky(fp_except except)30*b02ee2d0Skettenis fpsetsticky(fp_except except)
31*b02ee2d0Skettenis {
32*b02ee2d0Skettenis fp_except old, new;
33*b02ee2d0Skettenis
34*b02ee2d0Skettenis __asm volatile("vmrs %0, fpscr" : "=r" (old));
35*b02ee2d0Skettenis new = old & ~(FP_X_MASK);
36*b02ee2d0Skettenis new |= (except & FP_X_MASK);
37*b02ee2d0Skettenis __asm volatile("vmsr fpscr, %0" :: "r" (new));
38*b02ee2d0Skettenis
39*b02ee2d0Skettenis old |= float_exception_flags;
40*b02ee2d0Skettenis float_exception_flags = except;
41*b02ee2d0Skettenis
42*b02ee2d0Skettenis return (old & FP_X_MASK);
43*b02ee2d0Skettenis }
44