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030c5d66 | 1 | /* FPU control word definitions. HP-PARISC version. |
d614a753 | 2 | Copyright (C) 2012-2020 Free Software Foundation, Inc. |
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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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
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18 | |
19 | #ifndef _FPU_CONTROL_H | |
20 | #define _FPU_CONTROL_H | |
21 | ||
e4363cfb | 22 | /* Masking of interrupts. */ |
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23 | #define _FPU_MASK_PM 0x00000001 /* Inexact (I) */ |
24 | #define _FPU_MASK_UM 0x00000002 /* Underflow (U) */ | |
25 | #define _FPU_MASK_OM 0x00000004 /* Overflow (O) */ | |
26 | #define _FPU_MASK_ZM 0x00000008 /* Divide by zero (Z) */ | |
27 | #define _FPU_MASK_IM 0x00000010 /* Invalid operation (V) */ | |
28 | ||
29 | /* Masking of rounding modes. */ | |
30 | #define _FPU_HPPA_MASK_RM 0x00000600 /* Rounding mode mask */ | |
31 | /* Masking of interrupt enable bits. */ | |
32 | #define _FPU_HPPA_MASK_INT 0x0000001f /* Interrupt mask */ | |
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33 | /* Shift by 27 to install flag bits. */ |
34 | #define _FPU_HPPA_SHIFT_FLAGS 27 | |
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35 | |
36 | /* There are no reserved bits in the PA fpsr (though some are undefined). */ | |
37 | #define _FPU_RESERVED 0x00000000 | |
38 | /* Default is: No traps enabled, no flags set, round to nearest. */ | |
39 | #define _FPU_DEFAULT 0x00000000 | |
40 | /* Default + exceptions (FE_ALL_EXCEPT) enabled. */ | |
41 | #define _FPU_IEEE (_FPU_DEFAULT | _FPU_HPPA_MASK_INT) | |
42 | ||
43 | /* Type of the control word. */ | |
44 | typedef unsigned int fpu_control_t; | |
45 | ||
46 | /* Macros for accessing the hardware control word. */ | |
47 | #define _FPU_GETCW(cw) \ | |
48 | ({ \ | |
828beb13 | 49 | union { __extension__ unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp; \ |
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50 | /* Get the current status word. */ \ |
51 | __asm__ ("fstd %%fr0,0(%1)\n\t" \ | |
52 | "fldd 0(%1),%%fr0\n\t" \ | |
53 | : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0"); \ | |
b7f7d28b | 54 | cw = __fullfp.__halfreg[0]; \ |
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55 | }) |
56 | ||
57 | #define _FPU_SETCW(cw) \ | |
58 | ({ \ | |
828beb13 | 59 | union { __extension__ unsigned long long __fpreg; unsigned int __halfreg[2]; } __fullfp; \ |
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60 | /* Get the current status word and set the control word. */ \ |
61 | __asm__ ("fstd %%fr0,0(%1)\n\t" \ | |
62 | : "=m" (__fullfp.__fpreg) : "r" (&__fullfp.__fpreg) : "%r0"); \ | |
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63 | __fullfp.__halfreg[0] = cw; \ |
64 | __asm__ ("fldd 0(%1),%%fr0\n\t" \ | |
b7f7d28b | 65 | : : "m" (__fullfp.__fpreg), "r" (&__fullfp.__fpreg) : "%r0" ); \ |
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66 | }) |
67 | ||
68 | /* Default control word set at startup. */ | |
69 | extern fpu_control_t __fpu_control; | |
70 | ||
71 | #endif /* _FPU_CONTROL_H */ |