mirror of
https://sourceware.org/git/glibc.git
synced 2024-09-21 17:04:05 +00:00
11bf8ce1d6
2003-07-22 H.J. Lu <hongjiu.lu@intel.com> * elf/dl-support.c (_dl_hwcap): New variable. (_dl_aux_init): Initialize GL(dl_hwcap) for static binaries. * sysdeps/i386/fpu/fclrexcpt.c: Include <unistd.h>, <ldsodefs.h> and <dl-procinfo.h>. (__feclearexcept): Clear MXCSR if needed. * sysdeps/i386/fpu/fsetexcptflg.c: Likewise. * sysdeps/i386/fpu_control.h (_FPU_GETCW, _FPU_SETCW): Document that newer hardware needs more than these macros. * sysdeps/i386/setfpucw.c: New file. 2003-07-22 Jakub Jelinek <jakub@redhat.com> * elf/Makefile (CFLAGS-ldconfig.c): Define IS_IN_ldconfig. * elf/ldconfig.c: Include dl-procinfo.c. (PROCINFO_CLASS): Define. * sysdeps/generic/ldsodefs.h (PROCINFO_CLASS): Define. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c: New file. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.h: New file. * sysdeps/unix/sysv/linux/i386/dl-procinfo.c (PROCINFO_CLASS): Define if not yet defined. Use it instead of EXTERN. Undefine at the end of the file. * sysdeps/unix/sysv/linux/arm/dl-procinfo.c (PROCINFO_CLASS): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/dl-procinfo.c (PROCINFO_CLASS): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/dl-procinfo.c (PROCINFO_CLASS): Likewise. 2003-07-22 H.J. Lu <hongjiu.lu@intel.com> * elf/ldconfig.c (main): Issue a fatal error if relative path is used to build cache. 2003-07-22 Ulrich Drepper <drepper@redhat.com> * elf/readlib.c (process_file): Avoid possible overflow in assignment.
103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/* FPU control word bits. i387 version.
|
|
Copyright (C) 1993,1995-1998,2000,2001,2003 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.
|
|
|
|
Note that the use of these macros is no sufficient anymore with
|
|
recent hardware. Some floating point operations are executed in
|
|
the SSE/SSE2 engines which have their own control and status register. */
|
|
#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 */
|