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Merge common parts of i386 and amd64's ieeefp.h into x86/x86_ieeefp.h
Reviews by: imp Differential Revision: https://reviews.freebsd.org/D26292
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| Original file line number | Diff line number | Diff line change |
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| /*- | ||
| * SPDX-License-Identifier: BSD-4-Clause | ||
| * | ||
| * Copyright (c) 2003 Peter Wemm. | ||
| * Copyright (c) 1990 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. | ||
| * | ||
| * from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93 | ||
| * $FreeBSD$ | ||
| */ | ||
|
|
||
| #ifndef _X86_X86_IEEEFP_H_ | ||
| #define _X86_X86_IEEEFP_H_ | ||
|
|
||
| /* Deprecated historical FPU control interface */ | ||
|
|
||
| /* | ||
| * IEEE floating point type, constant and function definitions. | ||
| * XXX: {FP,SSE}*FLD and {FP,SSE}*OFF are undocumented pollution. | ||
| */ | ||
|
|
||
| #ifndef _SYS_CDEFS_H_ | ||
| #error this file needs sys/cdefs.h as a prerequisite | ||
| #endif | ||
|
|
||
| /* | ||
| * Rounding modes. | ||
| */ | ||
| typedef enum { | ||
| FP_RN=0, /* round to nearest */ | ||
| FP_RM, /* round down towards minus infinity */ | ||
| FP_RP, /* round up towards plus infinity */ | ||
| FP_RZ /* truncate */ | ||
| } fp_rnd_t; | ||
|
|
||
| /* | ||
| * Precision (i.e., rounding precision) modes. | ||
| */ | ||
| typedef enum { | ||
| FP_PS=0, /* 24 bit (single-precision) */ | ||
| FP_PRS, /* reserved */ | ||
| FP_PD, /* 53 bit (double-precision) */ | ||
| FP_PE /* 64 bit (extended-precision) */ | ||
| } fp_prec_t; | ||
|
|
||
| #define fp_except_t int | ||
|
|
||
| /* | ||
| * Exception bit masks. | ||
| */ | ||
| #define FP_X_INV 0x01 /* invalid operation */ | ||
| #define FP_X_DNML 0x02 /* denormal */ | ||
| #define FP_X_DZ 0x04 /* zero divide */ | ||
| #define FP_X_OFL 0x08 /* overflow */ | ||
| #define FP_X_UFL 0x10 /* underflow */ | ||
| #define FP_X_IMP 0x20 /* (im)precision */ | ||
| #define FP_X_STK 0x40 /* stack fault */ | ||
|
|
||
| /* | ||
| * FPU control word bit-field masks. | ||
| */ | ||
| #define FP_MSKS_FLD 0x3f /* exception masks field */ | ||
| #define FP_PRC_FLD 0x300 /* precision control field */ | ||
| #define FP_RND_FLD 0xc00 /* rounding control field */ | ||
|
|
||
| /* | ||
| * FPU status word bit-field masks. | ||
| */ | ||
| #define FP_STKY_FLD 0x3f /* sticky flags field */ | ||
|
|
||
| /* | ||
| * FPU control word bit-field offsets (shift counts). | ||
| */ | ||
| #define FP_MSKS_OFF 0 /* exception masks offset */ | ||
| #define FP_PRC_OFF 8 /* precision control offset */ | ||
| #define FP_RND_OFF 10 /* rounding control offset */ | ||
|
|
||
| /* | ||
| * FPU status word bit-field offsets (shift counts). | ||
| */ | ||
| #define FP_STKY_OFF 0 /* sticky flags offset */ | ||
|
|
||
| #ifdef __GNUCLIKE_ASM | ||
|
|
||
| #define __fldcw(addr) __asm __volatile("fldcw %0" : : "m" (*(addr))) | ||
| #define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr))) | ||
| #define __fnclex() __asm __volatile("fnclex") | ||
| #define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr))) | ||
| #define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr))) | ||
| #define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr))) | ||
| #define __ldmxcsr(addr) __asm __volatile("ldmxcsr %0" : : "m" (*(addr))) | ||
| #define __stmxcsr(addr) __asm __volatile("stmxcsr %0" : "=m" (*(addr))) | ||
|
|
||
| /* | ||
| * Load the control word. Be careful not to trap if there is a currently | ||
| * unmasked exception (ones that will become freshly unmasked are not a | ||
| * problem). This case must be handled by a save/restore of the | ||
| * environment or even of the full x87 state. Accessing the environment | ||
| * is very inefficient, so only do it when necessary. | ||
| */ | ||
| static __inline void | ||
| __fnldcw(unsigned short _cw, unsigned short _newcw) | ||
| { | ||
| struct { | ||
| unsigned _cw; | ||
| unsigned _other[6]; | ||
| } _env; | ||
| unsigned short _sw; | ||
|
|
||
| if ((_cw & FP_MSKS_FLD) != FP_MSKS_FLD) { | ||
| __fnstsw(&_sw); | ||
| if (((_sw & ~_cw) & FP_STKY_FLD) != 0) { | ||
| __fnstenv(&_env); | ||
| _env._cw = _newcw; | ||
| __fldenv(&_env); | ||
| return; | ||
| } | ||
| } | ||
| __fldcw(&_newcw); | ||
| } | ||
|
|
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| #endif /* __GNUCLIKE_ASM */ | ||
|
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| #endif/* _X86_X86_IEEEFP_H_ */ |