83 lines
3.5 KiB
C
83 lines
3.5 KiB
C
/* $NetBSD: fpbits.h,v 1.1 2002/06/05 01:04:25 fredette Exp $ */
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/* $OpenBSD: fpbits.h,v 1.4 2001/03/29 03:58:18 mickey Exp $ */
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/*
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* Copyright 1996 1995 by Open Software Foundation, Inc.
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* All Rights Reserved
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies and
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* that both the copyright notice and this permission notice appear in
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* supporting documentation.
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*
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* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* pmk1.1
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*/
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/*
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* (c) Copyright 1986 HEWLETT-PACKARD COMPANY
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*
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* To anyone who acknowledges that this file is provided "AS IS"
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* without any express or implied warranty:
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* permission to use, copy, modify, and distribute this file
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* for any purpose is hereby granted without fee, provided that
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* the above copyright notice and this notice appears in all
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* copies, and that the name of Hewlett-Packard Company not be
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* used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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* Hewlett-Packard Company makes no representations about the
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* suitability of this software for any purpose.
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*/
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/*
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* These macros are designed to be portable to all machines that have
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* a wordsize greater than or equal to 32 bits that support the portable
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* C compiler and the standard C preprocessor. Wordsize (default 32)
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* and bitfield assignment (default left-to-right, unlike VAX, PDP-11)
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* should be predefined using the constants HOSTWDSZ and BITFRL and
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* the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20).
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* Note that the macro arguments assume that the integer being referenced
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* is a 32-bit integer (right-justified on the 20) and that bit 0 is the
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* most significant bit.
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*/
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#ifndef HOSTWDSZ
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#define HOSTWDSZ 32
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#endif
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/*########################### Macros ######################################*/
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/*-------------------------------------------------------------------------
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* NewDeclareBitField_Reference - Declare a structure similar to the simulator
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* function "DeclBitfR" except its use is restricted to occur within a larger
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* enclosing structure or union definition. This declaration is an unnamed
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* structure with the argument, name, as the member name and the argument,
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* uname, as the element name.
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*----------------------------------------------------------------------- */
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#define Bitfield_extract(start, length, object) \
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((object) >> (HOSTWDSZ - (start) - (length)) & \
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((unsigned)-1 >> (HOSTWDSZ - (length))))
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#define Bitfield_signed_extract(start, length, object) \
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((int)((object) << start) >> (HOSTWDSZ - (length)))
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#define Bitfield_mask(start, len, object) \
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((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len)))
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#define Bitfield_deposit(value,start,len,object) object = \
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((object) & ~(((unsigned)-1 >> (HOSTWDSZ-(len))) << (HOSTWDSZ-(start)-(len)))) | \
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(((value) & ((unsigned)-1 >> (HOSTWDSZ-(len)))) << (HOSTWDSZ-(start)-(len)))
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