fpu_control.h (2577B) - Raw
1 /* FPU control word definitions. ARM VFP version. 2 Copyright (C) 2004-2025 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 */