1 /* FPU control word bits. SPARC version. 2 Copyright (C) 1997-2022 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 1 21 22 23 #include <features.h> 24 #include <bits/wordsize.h> 25 26 /* masking of interrupts */ 27 #define _FPU_MASK_IM 0x08000000 28 #define _FPU_MASK_OM 0x04000000 29 #define _FPU_MASK_UM 0x02000000 30 #define _FPU_MASK_ZM 0x01000000 31 #define _FPU_MASK_PM 0x00800000 32 33 /* precision control */ 34 #define _FPU_EXTENDED 0x00000000 /* RECOMMENDED */ 35 #define _FPU_DOUBLE 0x20000000 36 #define _FPU_80BIT 0x30000000 37 #define _FPU_SINGLE 0x10000000 /* DO NOT USE */ 38 39 /* rounding control / Sparc */ 40 #define _FPU_RC_DOWN 0xc0000000 41 #define _FPU_RC_UP 0x80000000 42 #define _FPU_RC_ZERO 0x40000000 43 #define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */ 44 45 #define _FPU_RESERVED 0x30300000 /* Reserved bits in cw */ 46 47 48 /* Now two recommended cw */ 49 50 /* Linux and IEEE default: 51 - extended precision 52 - rounding to nearest 53 - no exceptions */ 54 #define _FPU_DEFAULT 0x0 55 #define _FPU_IEEE 0x0 56 57 /* Type of the control word. */ 58 typedef unsigned long int fpu_control_t; 59 60 #if __WORDSIZE == 64 61 # define _FPU_GETCW(cw) __asm__ __volatile__ ("stx %%fsr,%0" : "=m" (*&cw)) 62 # define _FPU_SETCW(cw) __asm__ __volatile__ ("ldx %0,%%fsr" : : "m" (*&cw)) 63 #else 64 # define _FPU_GETCW(cw) __asm__ __volatile__ ("st %%fsr,%0" : "=m" (*&cw)) 65 # define _FPU_SETCW(cw) __asm__ __volatile__ ("ld %0,%%fsr" : : "m" (*&cw)) 66 #endif 67 68 /* Default control word set at startup. */ 69 extern fpu_control_t __fpu_control; 70 71 #endif /* fpu_control.h */ 72