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1 | /* FPU control word definitions. SH version. |
---|---|
2 | Copyright (C) 1999-2022 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 |
21 | |
22 | #if !defined(__SH_FPU_ANY__) |
23 | |
24 | #define _FPU_RESERVED 0xffffffff |
25 | #define _FPU_DEFAULT 0x00000000 |
26 | typedef unsigned int fpu_control_t; |
27 | #define _FPU_GETCW(cw) (cw) = 0 |
28 | #define _FPU_SETCW(cw) (void) (cw) |
29 | extern fpu_control_t __fpu_control; |
30 | |
31 | #else |
32 | |
33 | #include <features.h> |
34 | |
35 | /* masking of interrupts */ |
36 | #define _FPU_MASK_VM 0x0800 /* Invalid operation */ |
37 | #define _FPU_MASK_ZM 0x0400 /* Division by zero */ |
38 | #define _FPU_MASK_OM 0x0200 /* Overflow */ |
39 | #define _FPU_MASK_UM 0x0100 /* Underflow */ |
40 | #define _FPU_MASK_IM 0x0080 /* Inexact operation */ |
41 | |
42 | /* rounding control */ |
43 | #define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */ |
44 | #define _FPU_RC_ZERO 0x1 |
45 | |
46 | #define _FPU_RESERVED 0xffc00000 /* These bits are reserved. */ |
47 | |
48 | /* The fdlibm code requires strict IEEE double precision arithmetic, |
49 | and no interrupts for exceptions, rounding to nearest. */ |
50 | #define _FPU_DEFAULT 0x00080000 /* Default value. */ |
51 | #define _FPU_IEEE 0x00080f80 /* Default + exceptions enabled. */ |
52 | |
53 | /* Type of the control word. */ |
54 | typedef unsigned int fpu_control_t; |
55 | |
56 | /* Macros for accessing the hardware control word. */ |
57 | #define _FPU_GETCW(cw) __asm__ ("sts fpscr,%0" : "=r" (cw)) |
58 | |
59 | #if defined __GNUC__ |
60 | __BEGIN_DECLS |
61 | |
62 | /* GCC provides this function. */ |
63 | extern void __set_fpscr (unsigned long); |
64 | #define _FPU_SETCW(cw) __set_fpscr ((cw)) |
65 | #else |
66 | #define _FPU_SETCW(cw) __asm__ ("lds %0,fpscr" : : "r" (cw)) |
67 | #endif |
68 | |
69 | /* Default control word set at startup. */ |
70 | extern fpu_control_t __fpu_control; |
71 | |
72 | __END_DECLS |
73 | |
74 | #endif /* __SH_FPU_ANY__ */ |
75 | |
76 | #endif /* _FPU_CONTROL_H */ |
77 |
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