| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) |
| 3 | * |
| 4 | * Floating-point emulation code |
| 5 | * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2, or (at your option) |
| 10 | * any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #ifdef __NO_PA_HDRS |
| 23 | PA header file -- do not include this header file for non-PA builds. |
| 24 | #endif |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | * These macros are designed to be portable to all machines that have |
| 29 | * a wordsize greater than or equal to 32 bits that support the portable |
| 30 | * C compiler and the standard C preprocessor. Wordsize (default 32) |
| 31 | * and bitfield assignment (default left-to-right, unlike VAX, PDP-11) |
| 32 | * should be predefined using the constants HOSTWDSZ and BITFRL and |
| 33 | * the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20). |
| 34 | * Note that the macro arguments assume that the integer being referenced |
| 35 | * is a 32-bit integer (right-justified on the 20) and that bit 0 is the |
| 36 | * most significant bit. |
| 37 | */ |
| 38 | |
| 39 | #ifndef HOSTWDSZ |
| 40 | #define HOSTWDSZ 32 |
| 41 | #endif |
| 42 | |
| 43 | |
| 44 | /*########################### Macros ######################################*/ |
| 45 | |
| 46 | /*------------------------------------------------------------------------- |
| 47 | * NewDeclareBitField_Reference - Declare a structure similar to the simulator |
| 48 | * function "DeclBitfR" except its use is restricted to occur within a larger |
| 49 | * enclosing structure or union definition. This declaration is an unnamed |
| 50 | * structure with the argument, name, as the member name and the argument, |
| 51 | * uname, as the element name. |
| 52 | *----------------------------------------------------------------------- */ |
| 53 | #define Bitfield_extract(start, length, object) \ |
| 54 | ((object) >> (HOSTWDSZ - (start) - (length)) & \ |
| 55 | ((unsigned)-1 >> (HOSTWDSZ - (length)))) |
| 56 | |
| 57 | #define Bitfield_signed_extract(start, length, object) \ |
| 58 | ((int)((object) << start) >> (HOSTWDSZ - (length))) |
| 59 | |
| 60 | #define Bitfield_mask(start, len, object) \ |
| 61 | ((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len))) |
| 62 | |
| 63 | #define Bitfield_deposit(value,start,len,object) object = \ |
| 64 | ((object) & ~(((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len))) | \ |
| 65 | (((value) & ((unsigned)-1 >> (HOSTWDSZ-len))) << (HOSTWDSZ-start-len)) |