glibc/sysdeps/m68k/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

102 lines
3.3 KiB
C

/* 68k FPU control word definitions.
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
/*
* Motorola floating point control register bits.
*
* 31-16 -> reserved (read as 0, ignored on write)
* 15 -> enable trap for BSUN exception
* 14 -> enable trap for SNAN exception
* 13 -> enable trap for OPERR exception
* 12 -> enable trap for OVFL exception
* 11 -> enable trap for UNFL exception
* 10 -> enable trap for DZ exception
* 9 -> enable trap for INEX2 exception
* 8 -> enable trap for INEX1 exception
* 7-6 -> Precision Control
* 5-4 -> Rounding Control
* 3-0 -> zero (read as 0, write as 0)
*
*
* Precision Control:
* 00 - round to extended precision
* 01 - round to single precision
* 10 - round to double precision
* 11 - undefined
*
* Rounding Control:
* 00 - rounding to nearest (RN)
* 01 - rounding toward zero (RZ)
* 10 - rounding (down)toward minus infinity (RM)
* 11 - rounding (up) toward plus infinity (RP)
*
* The hardware default is 0x0000. I choose 0x5400.
*/
#include <features.h>
/* masking of interrupts */
#define _FPU_MASK_BSUN 0x8000
#define _FPU_MASK_SNAN 0x4000
#define _FPU_MASK_OPERR 0x2000
#define _FPU_MASK_OVFL 0x1000
#define _FPU_MASK_UNFL 0x0800
#define _FPU_MASK_DZ 0x0400
#define _FPU_MASK_INEX1 0x0200
#define _FPU_MASK_INEX2 0x0100
/* precision control */
#define _FPU_EXTENDED 0x00 /* RECOMMENDED */
#define _FPU_DOUBLE 0x80
#define _FPU_SINGLE 0x40 /* DO NOT USE */
/* rounding control */
#define _FPU_RC_NEAREST 0x00 /* RECOMMENDED */
#define _FPU_RC_ZERO 0x10
#define _FPU_RC_DOWN 0x20
#define _FPU_RC_UP 0x30
#define _FPU_RESERVED 0xFFFF000F /* Reserved bits in fpucr */
/* Now two recommended fpucr */
/* 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
/* IEEE: same as above, but exceptions. We must make it non-zero so
that __setfpucw works. This bit will be ignored. */
#define _FPU_IEEE 0x00000001
/* Type of the control word. */
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__SI__)));
/* Macros for accessing the hardware control word. */
#define _FPU_GETCW(cw) __asm__ ("fmove%.l %!, %0" : "=dm" (cw))
#define _FPU_SETCW(cw) __asm__ volatile ("fmove%.l %0, %!" : : "dm" (cw))
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;
#endif /* _M68K_FPU_CONTROL_H */