[uClibc-cvs] uClibc/libc/sysdeps/linux/i386 fpu_control.h, NONE, 1.1 Makefile, 1.57, 1.58

Erik Andersen andersen at uclibc.org
Wed Oct 8 19:30:39 UTC 2003


Update of /var/cvs/uClibc/libc/sysdeps/linux/i386
In directory winder:/tmp/cvs-serv31511/i386

Modified Files:
	Makefile 
Added Files:
	fpu_control.h 
Log Message:
Patch from Atsushi Nemoto (with some additions):

Current uClibc contains only one fpu_control.h and it is i386 version.
This is a patch to use platform specific fpu_control.h.  All new files
come from glibc 2.3.2.  This patch is against 0.9.21 but also can be
applied to CVS as is.



Index: Makefile
===================================================================
RCS file: /var/cvs/uClibc/libc/sysdeps/linux/i386/Makefile,v
retrieving revision 1.57
retrieving revision 1.58
diff -u -d -r1.57 -r1.58
--- Makefile	21 Sep 2003 19:41:54 -0000	1.57
+++ Makefile	8 Oct 2003 19:30:35 -0000	1.58
@@ -65,6 +65,7 @@
 endif
 
 headers:
+	cd $(TOPDIR)/include && ln -fs ../libc/sysdeps/linux/i386/fpu_control.h .
 
 
 clean:

--- NEW FILE: fpu_control.h ---
/* FPU control word bits.  i387 version.
   Copyright (C) 1993,1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Olaf Flebbe.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _FPU_CONTROL_H
#define _FPU_CONTROL_H	1

/* Here is the dirty part. Set up your 387 through the control word
 * (cw) register.
 *
 *     15-13    12  11-10  9-8     7-6     5    4    3    2    1    0
 * | reserved | IC | RC  | PC | reserved | PM | UM | OM | ZM | DM | IM
 *
 * IM: Invalid operation mask
 * DM: Denormalized operand mask
 * ZM: Zero-divide mask
 * OM: Overflow mask
 * UM: Underflow mask
 * PM: Precision (inexact result) mask
 *
 * Mask bit is 1 means no interrupt.
 *
 * PC: Precision control
 * 11 - round to extended precision
 * 10 - round to double precision
 * 00 - round to single precision
 *
 * RC: Rounding control
 * 00 - rounding to nearest
 * 01 - rounding down (toward - infinity)
 * 10 - rounding up (toward + infinity)
 * 11 - rounding toward zero
 *
 * IC: Infinity control
 * That is for 8087 and 80287 only.
 *
 * The hardware default is 0x037f which we use.
 */

#include <features.h>

/* masking of interrupts */
#define _FPU_MASK_IM  0x01
#define _FPU_MASK_DM  0x02
#define _FPU_MASK_ZM  0x04
#define _FPU_MASK_OM  0x08
#define _FPU_MASK_UM  0x10
#define _FPU_MASK_PM  0x20

/* precision control */
#define _FPU_EXTENDED 0x300	/* libm requires double extended precision.  */
#define _FPU_DOUBLE   0x200
#define _FPU_SINGLE   0x0

/* rounding control */
#define _FPU_RC_NEAREST 0x0    /* RECOMMENDED */
#define _FPU_RC_DOWN    0x400
#define _FPU_RC_UP      0x800
#define _FPU_RC_ZERO    0xC00

#define _FPU_RESERVED 0xF0C0  /* Reserved bits in cw */


/* The fdlibm code requires strict IEEE double precision arithmetic,
   and no interrupts for exceptions, rounding to nearest.  */

#define _FPU_DEFAULT  0x037f

/* IEEE:  same as above.  */
#define _FPU_IEEE     0x037f

/* Type of the control word.  */
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));

/* Macros for accessing the hardware control word.  */
#define _FPU_GETCW(cw) __asm__ ("fnstcw %0" : "=m" (*&cw))
#define _FPU_SETCW(cw) __asm__ ("fldcw %0" : : "m" (*&cw))

/* Default control word set at startup.  */
extern fpu_control_t __fpu_control;

#endif	/* fpu_control.h */




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