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 * @(#) floatingpoint.h 1.0 (Berkeley) 9/23/93 34 */ 35 36 /* 37 * IEEE floating point structure and function definitions 38 */ 39 40 #ifndef _FLOATINGPOINT_H_ 41 #define _FLOATINGPOINT_H_ 42 43 #include <sys/cdefs.h> 44 #include <sys/ieeefp.h> 45 46 #ifdef __GNUC__ 47 48 #define fnstcw(addr) __asm("fnstcw %0" : "=m" (*addr) : "0" (*addr)) 49 #define fnstsw(addr) __asm("fnstsw %0" : "=m" (*addr) : "0" (*addr)) 50 #define fnstenv(addr) __asm("fnstenv %0" : "=m" (*addr) : "0" (*addr)) 51 #define fldenv(addr) __asm("fldenv %0" : : "m" (*addr)) 52 53 #ifdef __i386__ 54 55 /* 56 * return the contents of a FP register 57 */ 58 static __inline__ 59 __fpgetreg(reg) 60 { 61 unsigned short mem; 62 63 switch(reg) { 64 default: 65 fnstcw(&mem); 66 break; 67 case FP_STKY_REG: 68 fnstsw(&mem); 69 break; 70 } 71 return mem; 72 } 73 74 /* 75 * set a FP mode; return previous mode 76 */ 77 static __inline__ 78 __fpsetreg(m, reg, fld, off) 79 { 80 unsigned env[7]; 81 unsigned p; 82 83 fnstenv(env); 84 p = (env[reg] & fld) >> off; 85 env[reg] = (env[reg] & ~fld) | (m << off & fld); 86 fldenv(env); 87 return p; 88 } 89 90 #endif /* __i386__ */ 91 92 #endif /* __GNUC__ */ 93 94 /* 95 * SysV/386 FP control interface 96 */ 97 #define fpgetround() ((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF) 98 #define fpsetround(m) __fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF) 99 #define fpgetprec() ((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF) 100 #define fpsetprec(m) __fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF) 101 #define fpgetmask() ((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF) 102 #define fpsetmask(m) __fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF) 103 #define fpgetsticky() ((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF) 104 #define fpresetsticky(m) __fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF) 105 #define fpsetsticky(m) fpresetsticky(m) 106 107 #endif /* !_FLOATINGPOINT_H_ */ 108