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| 1 | /* FPU control word definitions. ARM VFP version. |
|---|---|
| 2 | Copyright (C) 2004-2022 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(_LIBC) && !defined(_LIBC_TEST)) && defined(__SOFTFP__) |
| 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 | /* masking of interrupts */ |
| 34 | #define _FPU_MASK_IM 0x00000100 /* invalid operation */ |
| 35 | #define _FPU_MASK_ZM 0x00000200 /* divide by zero */ |
| 36 | #define _FPU_MASK_OM 0x00000400 /* overflow */ |
| 37 | #define _FPU_MASK_UM 0x00000800 /* underflow */ |
| 38 | #define _FPU_MASK_PM 0x00001000 /* inexact */ |
| 39 | |
| 40 | #define _FPU_MASK_NZCV 0xf0000000 /* NZCV flags */ |
| 41 | #define _FPU_MASK_RM 0x00c00000 /* rounding mode */ |
| 42 | #define _FPU_MASK_EXCEPT 0x00001f1f /* all exception flags */ |
| 43 | |
| 44 | /* Some bits in the FPSCR are not yet defined. They must be preserved when |
| 45 | modifying the contents. */ |
| 46 | #define _FPU_RESERVED 0x00086060 |
| 47 | #define _FPU_DEFAULT 0x00000000 |
| 48 | |
| 49 | /* Default + exceptions enabled. */ |
| 50 | #define _FPU_IEEE (_FPU_DEFAULT | 0x00001f00) |
| 51 | |
| 52 | /* Type of the control word. */ |
| 53 | typedef unsigned int fpu_control_t; |
| 54 | |
| 55 | /* Macros for accessing the hardware control word. */ |
| 56 | #ifdef __SOFTFP__ |
| 57 | /* This is fmrx %0, fpscr. */ |
| 58 | # define _FPU_GETCW(cw) \ |
| 59 | __asm__ __volatile__ ("mrc p10, 7, %0, cr1, cr0, 0" : "=r" (cw)) |
| 60 | /* This is fmxr fpscr, %0. */ |
| 61 | # define _FPU_SETCW(cw) \ |
| 62 | __asm__ __volatile__ ("mcr p10, 7, %0, cr1, cr0, 0" : : "r" (cw)) |
| 63 | #else |
| 64 | # define _FPU_GETCW(cw) \ |
| 65 | __asm__ __volatile__ ("vmrs %0, fpscr" : "=r" (cw)) |
| 66 | # define _FPU_SETCW(cw) \ |
| 67 | __asm__ __volatile__ ("vmsr fpscr, %0" : : "r" (cw)) |
| 68 | #endif |
| 69 | |
| 70 | /* Default control word set at startup. */ |
| 71 | extern fpu_control_t __fpu_control; |
| 72 | |
| 73 | #endif /* __SOFTFP__ */ |
| 74 | |
| 75 | #endif /* _FPU_CONTROL_H */ |
| 76 |
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