1/*- 2 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/lib/msun/arm/fenv.c,v 1.1 2004/06/06 10:03:59 das Exp $ 27 */ 28 29#include <fenv.h> 30 31#define FPSCR_ENABLE_SHIFT 8 32#define FPSCR_ENABLE_MASK (FE_ALL_EXCEPT << FPSCR_ENABLE_SHIFT) 33 34#define FPSCR_RMODE_SHIFT 22 35 36const fenv_t __fe_dfl_env = 0; 37 38int fegetenv(fenv_t* __envp) { 39 fenv_t _fpscr; 40 __asm__ __volatile__("vmrs %0,fpscr" : "=r" (_fpscr)); 41 *__envp = _fpscr; 42 return 0; 43} 44 45int fesetenv(const fenv_t* __envp) { 46 fenv_t _fpscr = *__envp; 47 __asm__ __volatile__("vmsr fpscr,%0" : :"ri" (_fpscr)); 48 return 0; 49} 50 51int feclearexcept(int __excepts) { 52 fexcept_t __fpscr; 53 fegetenv(&__fpscr); 54 __fpscr &= ~__excepts; 55 fesetenv(&__fpscr); 56 return 0; 57} 58 59int fegetexceptflag(fexcept_t* __flagp, int __excepts) { 60 fexcept_t __fpscr; 61 fegetenv(&__fpscr); 62 *__flagp = __fpscr & __excepts; 63 return 0; 64} 65 66int fesetexceptflag(const fexcept_t* __flagp, int __excepts) { 67 fexcept_t __fpscr; 68 fegetenv(&__fpscr); 69 __fpscr &= ~__excepts; 70 __fpscr |= *__flagp & __excepts; 71 fesetenv(&__fpscr); 72 return 0; 73} 74 75int feraiseexcept(int __excepts) { 76 fexcept_t __ex = __excepts; 77 fesetexceptflag(&__ex, __excepts); 78 return 0; 79} 80 81int fetestexcept(int __excepts) { 82 fexcept_t __fpscr; 83 fegetenv(&__fpscr); 84 return (__fpscr & __excepts); 85} 86 87int fegetround(void) { 88 fenv_t _fpscr; 89 fegetenv(&_fpscr); 90 return ((_fpscr >> FPSCR_RMODE_SHIFT) & 0x3); 91} 92 93int fesetround(int __round) { 94 fenv_t _fpscr; 95 fegetenv(&_fpscr); 96 _fpscr &= ~(0x3 << FPSCR_RMODE_SHIFT); 97 _fpscr |= (__round << FPSCR_RMODE_SHIFT); 98 fesetenv(&_fpscr); 99 return 0; 100} 101 102int feholdexcept(fenv_t* __envp) { 103 fenv_t __env; 104 fegetenv(&__env); 105 *__envp = __env; 106 __env &= ~(FE_ALL_EXCEPT | FPSCR_ENABLE_MASK); 107 fesetenv(&__env); 108 return 0; 109} 110 111int feupdateenv(const fenv_t* __envp) { 112 fexcept_t __fpscr; 113 fegetenv(&__fpscr); 114 fesetenv(__envp); 115 feraiseexcept(__fpscr & FE_ALL_EXCEPT); 116 return 0; 117} 118 119int feenableexcept(int __mask) { 120 fenv_t __old_fpscr, __new_fpscr; 121 fegetenv(&__old_fpscr); 122 __new_fpscr = __old_fpscr | (__mask & FE_ALL_EXCEPT) << FPSCR_ENABLE_SHIFT; 123 fesetenv(&__new_fpscr); 124 return ((__old_fpscr >> FPSCR_ENABLE_SHIFT) & FE_ALL_EXCEPT); 125} 126 127int fedisableexcept(int __mask) { 128 fenv_t __old_fpscr, __new_fpscr; 129 fegetenv(&__old_fpscr); 130 __new_fpscr = __old_fpscr & ~((__mask & FE_ALL_EXCEPT) << FPSCR_ENABLE_SHIFT); 131 fesetenv(&__new_fpscr); 132 return ((__old_fpscr >> FPSCR_ENABLE_SHIFT) & FE_ALL_EXCEPT); 133} 134 135int fegetexcept(void) { 136 fenv_t __fpscr; 137 fegetenv(&__fpscr); 138 return ((__fpscr & FPSCR_ENABLE_MASK) >> FPSCR_ENABLE_SHIFT); 139} 140