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author | alm <alm@FreeBSD.org> | 1993-08-25 09:01:44 +0000 |
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committer | alm <alm@FreeBSD.org> | 1993-08-25 09:01:44 +0000 |
commit | 19f81735f54b5e96ee67854c561dd24aba4bb00d (patch) | |
tree | cee0b29f6242ba86eb5a4bbebe1437e51873b900 /sys/i386/include/floatingpoint.h | |
parent | 6b4c61478284288ff260cb714043fc9a0d22e868 (diff) | |
download | FreeBSD-src-19f81735f54b5e96ee67854c561dd24aba4bb00d.zip FreeBSD-src-19f81735f54b5e96ee67854c561dd24aba4bb00d.tar.gz |
adding fpgetround(3) IEEE floating point environment support
Diffstat (limited to 'sys/i386/include/floatingpoint.h')
-rw-r--r-- | sys/i386/include/floatingpoint.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/sys/i386/include/floatingpoint.h b/sys/i386/include/floatingpoint.h new file mode 100644 index 0000000..bc69d2e --- /dev/null +++ b/sys/i386/include/floatingpoint.h @@ -0,0 +1,107 @@ +/*- + * Copyright (c) 1993 Andrew Moore, Talke Studio + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#) floatingpoint.h 1.0 (Berkeley) 9/23/93 + */ + +/* + * IEEE floating point structure and function definitions + */ + +#ifndef _FLOATINGPOINT_H_ +#define _FLOATINGPOINT_H_ + +#include <sys/cdefs.h> +#include <sys/ieeefp.h> + +#ifdef __GNUC__ + +#define fnstcw(addr) __asm("fnstcw %0" : "=m" (*addr) : "0" (*addr)) +#define fnstsw(addr) __asm("fnstsw %0" : "=m" (*addr) : "0" (*addr)) +#define fnstenv(addr) __asm("fnstenv %0" : "=m" (*addr) : "0" (*addr)) +#define fldenv(addr) __asm("fldenv %0" : : "m" (*addr)) + +#ifdef __i386__ + +/* + * return the contents of a FP register + */ +static __inline__ +__fpgetreg(reg) +{ + unsigned short mem; + + switch(reg) { + default: + fnstcw(&mem); + break; + case FP_STKY_REG: + fnstsw(&mem); + break; + } + return mem; +} + +/* + * set a FP mode; return previous mode + */ +static __inline__ +__fpsetreg(m, reg, fld, off) +{ + unsigned env[7]; + unsigned p; + + fnstenv(env); + p = (env[reg] & fld) >> off; + env[reg] = (env[reg] & ~fld) | (m << off & fld); + fldenv(env); + return p; +} + +#endif /* __i386__ */ + +#endif /* __GNUC__ */ + +/* + * SysV/386 FP control interface + */ +#define fpgetround() ((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF) +#define fpsetround(m) __fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF) +#define fpgetprec() ((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF) +#define fpsetprec(m) __fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF) +#define fpgetmask() ((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF) +#define fpsetmask(m) __fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF) +#define fpgetsticky() ((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF) +#define fpresetsticky(m) __fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF) +#define fpsetsticky(m) fpresetsticky(m) + +#endif /* !_FLOATINGPOINT_H_ */ |