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1 | /* FPU control word bits. C-SKY version. |
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2 | Copyright (C) 2018-2022 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 | /* C-SKY FPU floating point control register bits. |
23 | |
24 | 31-28 -> Reserved (read as 0, write with 0). |
25 | 27 -> 0: Flush denormalized results to zero. |
26 | 1: Flush denormalized results to signed minimal normal number. |
27 | 26 -> Reserved (read as 0, write with 0). |
28 | 25-24 -> Rounding control. |
29 | 23-6 -> Reserved (read as 0, write with 0). |
30 | 5 -> Enable exception for input denormalized exception. |
31 | 4 -> Enable exception for inexact exception. |
32 | 3 -> Enable exception for underflow exception. |
33 | 2 -> Enable exception for overflow exception. |
34 | 1 -> Enable exception for division by zero exception. |
35 | 0 -> Enable exception for invalid operation exception. |
36 | |
37 | Rounding Control: |
38 | 00 - Rounding to nearest (RN). |
39 | 01 - Rounding toward zero (RZ). |
40 | 10 - Rounding (up) toward plus infinity (RP). |
41 | 11 - Rounding (down)toward minus infinity (RM). |
42 | |
43 | C-SKY FPU floating point exception status register bits. |
44 | |
45 | 15 -> Accumulate bit for any exception. |
46 | 14 -> Reserved (read as 0, write with 0). |
47 | 13 -> Cause bit for input denormalized exception. |
48 | 12 -> Cause bit for inexact exception. |
49 | 11 -> Cause bit for underflow exception. |
50 | 10 -> Cause bit for overflow exception. |
51 | 9 -> Cause bit for division by zero exception. |
52 | 8 -> Cause bit for invalid operation exception. |
53 | 7 -> Flag bit for any exception. |
54 | 6 -> Reserved (read as 0, write with 0). |
55 | 5 -> Flag exception for input denormalized exception. |
56 | 4 -> Flag exception for inexact exception. |
57 | 3 -> Flag exception for underflow exception. |
58 | 2 -> Flag exception for overflow exception. |
59 | 1 -> Flag exception for division by zero exception. |
60 | 0 -> Flag exception for invalid operation exception. */ |
61 | |
62 | #include <features.h> |
63 | |
64 | #ifdef __csky_soft_float__ |
65 | |
66 | # define _FPU_RESERVED 0xffffffff |
67 | # define _FPU_DEFAULT 0x00000000 |
68 | typedef unsigned int fpu_control_t; |
69 | # define _FPU_GETCW(cw) (cw) = 0 |
70 | # define _FPU_SETCW(cw) (void) (cw) |
71 | # define _FPU_GETFPSR(cw) (cw) = 0 |
72 | # define _FPU_SETFPSR(cw) (void) (cw) |
73 | extern fpu_control_t __fpu_control; |
74 | |
75 | #else /* __csky_soft_float__ */ |
76 | |
77 | /* Masking of interrupts. */ |
78 | # define _FPU_MASK_IDE (1 << 5) /* Input denormalized exception. */ |
79 | # define _FPU_MASK_IXE (1 << 4) /* Inexact exception. */ |
80 | # define _FPU_MASK_UFE (1 << 3) /* Underflow exception. */ |
81 | # define _FPU_MASK_OFE (1 << 2) /* Overflow exception. */ |
82 | # define _FPU_MASK_DZE (1 << 1) /* Division by zero exception. */ |
83 | # define _FPU_MASK_IOE (1 << 0) /* Invalid operation exception. */ |
84 | |
85 | # define _FPU_MASK_FEA (1 << 15) /* Case for any exception. */ |
86 | # define _FPU_MASK_FEC (1 << 7) /* Flag for any exception. */ |
87 | |
88 | /* Flush denormalized numbers to zero. */ |
89 | # define _FPU_FLUSH_TZ 0x8000000 |
90 | |
91 | /* Rounding control. */ |
92 | # define _FPU_RC_NEAREST (0x0 << 24) /* RECOMMENDED. */ |
93 | # define _FPU_RC_ZERO (0x1 << 24) |
94 | # define _FPU_RC_UP (0x2 << 24) |
95 | # define _FPU_RC_DOWN (0x3 << 24) |
96 | |
97 | # define _FPU_RESERVED 0xf460ffc0 /* Reserved bits in cw. */ |
98 | # define _FPU_FPSR_RESERVED 0xffff4040 |
99 | |
100 | /* The fdlibm code requires strict IEEE double precision arithmetic, |
101 | and no interrupts for exceptions, rounding to nearest. */ |
102 | |
103 | # define _FPU_DEFAULT 0x00000000 |
104 | # define _FPU_FPSR_DEFAULT 0x00000000 |
105 | |
106 | /* IEEE: same as above, but exceptions. */ |
107 | # define _FPU_FPCR_IEEE 0x0000001F |
108 | # define _FPU_FPSR_IEEE 0x00000000 |
109 | |
110 | /* Type of the control word. */ |
111 | typedef unsigned int fpu_control_t; |
112 | |
113 | /* Macros for accessing the hardware control word. */ |
114 | # if (__CSKY__ == 2) |
115 | # define _FPU_GETCW(cw) __asm__ volatile ("mfcr %0, cr<1, 2>" : "=a" (cw)) |
116 | # define _FPU_SETCW(cw) __asm__ volatile ("mtcr %0, cr<1, 2>" : : "a" (cw)) |
117 | # define _FPU_GETFPSR(cw) __asm__ volatile ("mfcr %0, cr<2, 2>" : "=a" (cw)) |
118 | # define _FPU_SETFPSR(cw) __asm__ volatile ("mtcr %0, cr<2, 2>" : : "a" (cw)) |
119 | # else |
120 | # define _FPU_GETCW(cw) __asm__ volatile ("1: cprcr %0, cpcr2 \n" \ |
121 | " btsti %0, 31 \n" \ |
122 | " bt 1b \n" \ |
123 | " cprcr %0, cpcr1\n" : "=b" (cw)) |
124 | |
125 | # define _FPU_SETCW(cw) __asm__ volatile ("1: cprcr r7, cpcr2 \n" \ |
126 | " btsti r7, 31 \n" \ |
127 | " bt 1b \n" \ |
128 | " cpwcr %0, cpcr1 \n" \ |
129 | : : "b" (cw) : "r7") |
130 | |
131 | # define _FPU_GETFPSR(cw) __asm__ volatile ("1: cprcr %0, cpcr2 \n" \ |
132 | " btsti %0, 31 \n" \ |
133 | " bt 1b \n" \ |
134 | " cprcr %0, cpcr4\n" : "=b" (cw)) |
135 | |
136 | # define _FPU_SETFPSR(cw) __asm__ volatile ("1: cprcr r7, cpcr2 \n" \ |
137 | " btsti r7, 31 \n" \ |
138 | " bt 1b \n" \ |
139 | " cpwcr %0, cpcr4 \n" \ |
140 | : : "b" (cw) : "r7") |
141 | # endif /* __CSKY__ != 2 */ |
142 | |
143 | /* Default control word set at startup. */ |
144 | extern fpu_control_t __fpu_control; |
145 | |
146 | #endif /* !__csky_soft_float__ */ |
147 | |
148 | #endif /* fpu_control.h */ |
149 |
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