1 /* $NetBSD: fpbits.h,v 1.1 2002/06/05 01:04:25 fredette Exp $ */ 2 3 /* $OpenBSD: fpbits.h,v 1.4 2001/03/29 03:58:18 mickey Exp $ */ 4 5 /* 6 * Copyright 1996 1995 by Open Software Foundation, Inc. 7 * All Rights Reserved 8 * 9 * Permission to use, copy, modify, and distribute this software and 10 * its documentation for any purpose and without fee is hereby granted, 11 * provided that the above copyright notice appears in all copies and 12 * that both the copyright notice and this permission notice appear in 13 * supporting documentation. 14 * 15 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 16 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 17 * FOR A PARTICULAR PURPOSE. 18 * 19 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 21 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 22 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 23 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 24 */ 25 /* 26 * pmk1.1 27 */ 28 /* 29 * (c) Copyright 1986 HEWLETT-PACKARD COMPANY 30 * 31 * To anyone who acknowledges that this file is provided "AS IS" 32 * without any express or implied warranty: 33 * permission to use, copy, modify, and distribute this file 34 * for any purpose is hereby granted without fee, provided that 35 * the above copyright notice and this notice appears in all 36 * copies, and that the name of Hewlett-Packard Company not be 37 * used in advertising or publicity pertaining to distribution 38 * of the software without specific, written prior permission. 39 * Hewlett-Packard Company makes no representations about the 40 * suitability of this software for any purpose. 41 */ 42 43 /* 44 * These macros are designed to be portable to all machines that have 45 * a wordsize greater than or equal to 32 bits that support the portable 46 * C compiler and the standard C preprocessor. Wordsize (default 32) 47 * and bitfield assignment (default left-to-right, unlike VAX, PDP-11) 48 * should be predefined using the constants HOSTWDSZ and BITFRL and 49 * the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20). 50 * Note that the macro arguments assume that the integer being referenced 51 * is a 32-bit integer (right-justified on the 20) and that bit 0 is the 52 * most significant bit. 53 */ 54 55 #ifndef HOSTWDSZ 56 #define HOSTWDSZ 32 57 #endif 58 59 60 /*########################### Macros ######################################*/ 61 62 /*------------------------------------------------------------------------- 63 * NewDeclareBitField_Reference - Declare a structure similar to the simulator 64 * function "DeclBitfR" except its use is restricted to occur within a larger 65 * enclosing structure or union definition. This declaration is an unnamed 66 * structure with the argument, name, as the member name and the argument, 67 * uname, as the element name. 68 *----------------------------------------------------------------------- */ 69 #define Bitfield_extract(start, length, object) \ 70 ((object) >> (HOSTWDSZ - (start) - (length)) & \ 71 ((unsigned)-1 >> (HOSTWDSZ - (length)))) 72 73 #define Bitfield_signed_extract(start, length, object) \ 74 ((int)((object) << start) >> (HOSTWDSZ - (length))) 75 76 #define Bitfield_mask(start, len, object) \ 77 ((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len))) 78 79 #define Bitfield_deposit(value,start,len,object) object = \ 80 ((object) & ~(((unsigned)-1 >> (HOSTWDSZ-(len))) << (HOSTWDSZ-(start)-(len)))) | \ 81 (((value) & ((unsigned)-1 >> (HOSTWDSZ-(len)))) << (HOSTWDSZ-(start)-(len))) 82 83