glibc/sysdeps/arm/fpu/fpu_control.h
Ulrich Drepper 4fcddf8e57 Update.
2000-03-24  Andreas Jaeger  <aj@suse.de>

	* Makefile (postclean): Added soversions.i.

2000-03-24  Scott Bambrough  <scottb@netwinder.org>

	* sysdeps/arm/fpu/fpu_control.h: Define _FPU_MASK_IM, _FPU_MASK_ZM,
	_FPU_MASK_OM, _FPU_MASK_UM, _FPU_MASK_PM, _FPU_MASK_DM, _FPU_DEFAULT,
	and _FPU_IEEE.  Change _FPU_RESERVED.

2000-03-24  Scott Bambrough  <scottb@netwinder.org>

	* sysdeps/unix/sysv/linux/arm/sys/ucontext.h: New file.

2000-03-24  Roland McGrath  <roland@baalperazim.frob.com>

	* sysdeps/posix/getaddrinfo.c: Include <net/if.h> for if_nametoindex.
	(gaih_inet): Remove unused duplicate variable.

	* inet/getnameinfo.c (getnameinfo): Use IFNAMSIZ, not MAXHOSTNAMELEN.
	Don't use __libc_sa_len, which only exists for Linux.  Just handle
	AF_INET and AF_INET6 directly as well as AF_LOCAL, since those are the
	only flavors supported by this function anyway.

2000-03-24  Geoff Clare  <gwc@unisoft.com>

	* stdlib/strfmon.c: corrected problems with missing signs and
	missing or extra spaces; allow for sign strings longer than
	one character; add padding to ensure positive and negative
	formats are aligned when a left precision is used.

2000-03-26  Ulrich Drepper  <drepper@redhat.com>

	* stdlib/random_r.c (__setstate_r): Allow RNGs of type 4.
	Patch by John Mizel <John.Mizel@msdw.com>.
2000-03-26 18:48:26 +00:00

103 lines
3.8 KiB
C

/* FPU control word definitions. ARM version.
Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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
/* We have a slight terminology confusion here. On the ARM, the register
* we're interested in is actually the FPU status word - the FPU control
* word is something different (which is implementation-defined and only
* accessible from supervisor mode.)
*
* The FPSR looks like this:
*
* 31-24 23-16 15-8 7-0
* | system ID | trap enable | system control | exception flags |
*
* We ignore the system ID bits; for interest's sake they are:
*
* 0000 "old" FPE
* 1000 FPPC hardware
* 0001 FPE 400
* 1001 FPA hardware
*
* The trap enable and exception flags are both structured like this:
*
* 7 - 5 4 3 2 1 0
* | reserved | INX | UFL | OFL | DVZ | IVO |
*
* where a `1' bit in the enable byte means that the trap can occur, and
* a `1' bit in the flags byte means the exception has occurred.
*
* The exceptions are:
*
* IVO - invalid operation
* DVZ - divide by zero
* OFL - overflow
* UFL - underflow
* INX - inexact (do not use; implementations differ)
*
* The system control byte looks like this:
*
* 7-5 4 3 2 1 0
* | reserved | AC | EP | SO | NE | ND |
*
* where the bits mean
*
* ND - no denormalised numbers (force them all to zero)
* NE - enable NaN exceptions
* SO - synchronous operation
* EP - use expanded packed-decimal format
* AC - use alternate definition for C flag on compare operations
*/
/* masking of interrupts */
#define _FPU_MASK_IM 0x00010000 /* invalid operation */
#define _FPU_MASK_ZM 0x00020000 /* divide by zero */
#define _FPU_MASK_OM 0x00040000 /* overflow */
#define _FPU_MASK_UM 0x00080000 /* underflow */
#define _FPU_MASK_PM 0x00100000 /* inexact */
#define _FPU_MASK_DM 0x00000000 /* denormalized operation */
/* The system id bytes cannot be changed.
Only the bottom 5 bits in the trap enable byte can be changed.
Only the bottom 5 bits in the system control byte can be changed.
Only the bottom 5 bits in the exception flags are used.
The exception flags are set by the fpu, but can be zeroed by the user. */
#define _FPU_RESERVED 0xffe0e0e0 /* These bits are reserved. */
/* The fdlibm code requires strict IEEE double precision arithmetic,
no interrupts for exceptions, rounding to nearest. Changing the
rounding mode will break long double I/O. Turn on the AC bit,
the compiler generates code that assumes it is on. */
#define _FPU_DEFAULT 0x00001000 /* Default value. */
#define _FPU_IEEE 0x001f1000 /* Default + exceptions enabled. */
/* Type of the control word. */
typedef unsigned int fpu_control_t;
/* Macros for accessing the hardware control word. */
#define _FPU_GETCW(cw) __asm__ ("rfs %0" : "=r" (cw))
#define _FPU_SETCW(cw) __asm__ ("wfs %0" : : "r" (cw))
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;
#endif /* _FPU_CONTROL_H */