1 /*- 2 * Copyright (c) 1993 Andrew Moore, Talke Studio 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#) floatingpoint.h 1.0 (Berkeley) 9/23/93 34 * $Id: floatingpoint.h,v 1.4 1993/11/07 17:42:55 wollman Exp $ 35 */ 36 37 /* 38 * IEEE floating point structure and function definitions 39 */ 40 41 #ifndef _FLOATINGPOINT_H_ 42 #define _FLOATINGPOINT_H_ 43 44 #include <sys/cdefs.h> 45 #include <machine/ieeefp.h> 46 47 #ifdef __GNUC__ 48 49 #ifdef __i386__ 50 51 #define fnstcw(addr) __asm("fnstcw %0" : "=m" (*addr) : "0" (*addr)) 52 #define fnstsw(addr) __asm("fnstsw %0" : "=m" (*addr) : "0" (*addr)) 53 #define fnstenv(addr) __asm("fnstenv %0" : "=m" (*addr) : "0" (*addr)) 54 #define fldenv(addr) __asm("fldenv %0" : : "m" (*addr)) 55 56 57 /* 58 * return the contents of a FP register 59 */ 60 static __inline__ int 61 __fpgetreg(int _reg) 62 { 63 unsigned short _mem; 64 65 switch(_reg) { 66 default: 67 fnstcw(&_mem); 68 break; 69 case FP_STKY_REG: 70 fnstsw(&_mem); 71 break; 72 } 73 return _mem; 74 } 75 76 /* 77 * set a FP mode; return previous mode 78 */ 79 static __inline__ int 80 __fpsetreg(int _m, int _reg, int _fld, int _off) 81 { 82 unsigned _env[7]; 83 unsigned _p; 84 85 fnstenv(_env); 86 _p = (_env[_reg] & _fld) >> _off; 87 _env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld); 88 fldenv(_env); 89 return _p; 90 } 91 92 #endif /* __i386__ */ 93 94 #endif /* __GNUC__ */ 95 96 /* 97 * SysV/386 FP control interface 98 */ 99 #define fpgetround() ((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF) 100 #define fpsetround(m) __fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF) 101 #define fpgetprec() ((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF) 102 #define fpsetprec(m) __fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF) 103 #define fpgetmask() ((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF) 104 #define fpsetmask(m) __fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF) 105 #define fpgetsticky() ((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF) 106 #define fpresetsticky(m) __fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF) 107 #define fpsetsticky(m) fpresetsticky(m) 108 109 #endif /* !_FLOATINGPOINT_H_ */ 110