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
55
56
57
58
59
60
61
62
63
|
/* FPU control word definitions. ARM VFP version.
Copyright (C) 2004, 2005, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#ifndef _FPU_CONTROL_H
#define _FPU_CONTROL_H
#if !defined(_LIBC) && defined(__SOFTFP__)
#define _FPU_RESERVED 0xffffffff
#define _FPU_DEFAULT 0x00000000
typedef unsigned int fpu_control_t;
#define _FPU_GETCW(cw) 0
#define _FPU_SETCW(cw) do { } while (0)
extern fpu_control_t __fpu_control;
#else
/* masking of interrupts */
#define _FPU_MASK_IM 0x00000100 /* invalid operation */
#define _FPU_MASK_ZM 0x00000200 /* divide by zero */
#define _FPU_MASK_OM 0x00000400 /* overflow */
#define _FPU_MASK_UM 0x00000800 /* underflow */
#define _FPU_MASK_PM 0x00001000 /* inexact */
/* Some bits in the FPSCR are not yet defined. They must be preserved when
modifying the contents. */
#define _FPU_RESERVED 0x0e08e0e0
#define _FPU_DEFAULT 0x00000000
/* Default + exceptions enabled. */
#define _FPU_IEEE (_FPU_DEFAULT | 0x00001f00)
/* Type of the control word. */
typedef unsigned int fpu_control_t;
/* Macros for accessing the hardware control word. */
/* This is fmrx %0, fpscr. */
#define _FPU_GETCW(cw) \
__asm__ __volatile__ ("mrc p10, 7, %0, cr1, cr0, 0" : "=r" (cw))
/* This is fmxr fpscr, %0. */
#define _FPU_SETCW(cw) \
__asm__ __volatile__ ("mcr p10, 7, %0, cr1, cr0, 0" : : "r" (cw))
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;
#endif /* __SOFTFP__ */
#endif /* _FPU_CONTROL_H */
|
