glibc/sysdeps/arm/fpu/fpu_control.h
Ulrich Drepper cb0509a8d5 Update.
1998-11-26  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/mips/dl-machine.h (ELF_MACHINE_NO_PLT): New defined macro.
	(elf_machine_got_rel): Remove scope variable.  Use scope from the map.
	Don't modify _dl_global_scope_end in the end.
	(__dl_runtime_resolv): Also use scope from the map.
	* sysdeps/mips/mips64/dl-machine.h: Likewise.
	* elf/dl-runtime.c: Don't define fixup and profile_fixup if
	ELF_MACHINE_NO_PLT is defined.
	* sysdeps/mips/sys/ucontext.h: New file.
	Patches by kaz Kojima <kkojima@rr.iij4u.or.jp>.

1998-11-26  Andreas Jaeger  <aj@arthur.rhein-neckar.de> 
 
	* sysdeps/generic/pselect.c (__pselect): Change interface, 
	set/restore sigmask. 
 
	* misc/sys/select.h: Change declaration according to Stevens' Unix  
	Network Programming. 
	* include/sys/select.h (__pselect): Likewise. 
	Reported by <bwelling@anomaly.munge.com> [PR libc/872]. 
 
	* include/fpu_control.h: New file, contains __setfpucw 
	declaration. 
 
	* sysdeps/generic/fpu_control.h: Remove __setfpucw declaration, 
	it's an internal symbol. 
	* sysdeps/alpha/fpu/fpu_control.h: Likewise. 
	* sysdeps/arm/fpu/fpu_control.h: Likewise. 
	* sysdeps/i386/fpu_control.h: Likewise. 
	* sysdeps/m68k/fpu_control.h: Likewise. 
	* sysdeps/powerpc/fpu_control.h: Likewise. 
	* sysdeps/sparc/sparc32/fpu/fpu_control.h: Likewise. 
	* sysdeps/sparc/sparc64/fpu/fpu_control.h: Likewise.
1998-11-26 12:02:23 +00:00

87 lines
3.0 KiB
C

/* FPU control word definitions. ARM version.
Copyright (C) 1996, 1997, 1998 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
*/
#define _FPU_RESERVED 0xfff0e0f0 /* These bits are reserved. */
/* The fdlibm code requires no interrupts for exceptions. Don't
change the rounding mode, it would break long double I/O! */
#define _FPU_DEFAULT 0x00000000 /* Default value. */
/* 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 */