fpsetsticky.c revision 1.7 
1/*	$NetBSD: fpsetsticky.c,v 1.7 2013/10/28 01:06:36 mrg Exp $	*/
2
3/*
4 * Written by J.T. Conklin, Apr 10, 1995
5 * Public domain.
6 */
7
8#include <sys/cdefs.h>
9#if defined(LIBC_SCCS) && !defined(lint)
10__RCSID("$NetBSD: fpsetsticky.c,v 1.7 2013/10/28 01:06:36 mrg Exp $");
11#endif /* LIBC_SCCS and not lint */
12
13#include "namespace.h"
14
15#include <sys/types.h>
16#include <ieeefp.h>
17
18#ifdef __weak_alias
19__weak_alias(fpsetsticky,_fpsetsticky)
20#endif
21
22#ifdef EXCEPTIONS_WITH_SOFTFLOAT
23extern fp_except _softfloat_float_exception_flags;
24#endif
25
26fp_except
27fpsetsticky(fp_except sticky)
28{
29	fp_except old;
30	fp_except new;
31
32	__asm("st %%fsr,%0" : "=m" (*&old));
33
34	new = old;
35	new &= ~(0x1f << 5);
36	new |= ((sticky & 0x1f) << 5);
37
38	__asm("ld %0,%%fsr" : : "m" (*&new));
39
40	old = ((uint32_t)old >> 5) & 0x1f;
41
42#ifdef EXCEPTIONS_WITH_SOFTFLOAT
43	old |= _softfloat_float_exception_flags;
44	_softfloat_float_exception_flags = sticky;
45#endif
46	return old;
47}
48