1/* FPU control word bits. SPARC version.
2 Copyright (C) 1997-2026 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _FPU_CONTROL_H
20#define _FPU_CONTROL_H 1
21
22
23#include <features.h>
24#include <bits/wordsize.h>
25
26/* masking of interrupts */
27#define _FPU_MASK_IM 0x08000000
28#define _FPU_MASK_OM 0x04000000
29#define _FPU_MASK_UM 0x02000000
30#define _FPU_MASK_ZM 0x01000000
31#define _FPU_MASK_PM 0x00800000
32
33/* precision control */
34#define _FPU_EXTENDED 0x00000000 /* RECOMMENDED */
35#define _FPU_DOUBLE 0x20000000
36#define _FPU_80BIT 0x30000000
37#define _FPU_SINGLE 0x10000000 /* DO NOT USE */
38
39/* rounding control / Sparc */
40#define _FPU_RC_DOWN 0xc0000000
41#define _FPU_RC_UP 0x80000000
42#define _FPU_RC_ZERO 0x40000000
43#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
44
45#define _FPU_RESERVED 0x303e0000 /* Reserved bits in cw */
46
47
48/* Now two recommended cw */
49
50/* Linux and IEEE default:
51 - extended precision
52 - rounding to nearest
53 - no exceptions */
54#define _FPU_DEFAULT 0x0
55#define _FPU_IEEE 0x0
56
57/* Type of the control word. */
58typedef unsigned long int fpu_control_t;
59
60#if __WORDSIZE == 64
61# define _FPU_GETCW(cw) __asm__ __volatile__ ("stx %%fsr,%0" : "=m" (*&cw))
62# define _FPU_SETCW(cw) __asm__ __volatile__ ("ldx %0,%%fsr" : : "m" (*&cw))
63#else
64# ifdef __leon__
65 /* Prevent stfsr from being placed directly after other fp instruction. */
66# define _FPU_GETCW(cw) __asm__ __volatile__ ("nop; st %%fsr,%0" : "=m" (*&cw))
67# else
68# define _FPU_GETCW(cw) __asm__ __volatile__ ("st %%fsr,%0" : "=m" (*&cw))
69# endif
70# define _FPU_SETCW(cw) __asm__ __volatile__ ("ld %0,%%fsr" : : "m" (*&cw))
71#endif
72
73/* Default control word set at startup. */
74extern fpu_control_t __fpu_control;
75
76#endif /* fpu_control.h */