1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Linux/PA-RISC Project (http://www.parisc-linux.org/) 4 * 5 * Floating-point emulation code 6 * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> 7 */ 8 9 #ifdef __NO_PA_HDRS 10 PA header file -- do not include this header file for non-PA builds. 11 #endif 12 13 14 /* 15 * These macros are designed to be portable to all machines that have 16 * a wordsize greater than or equal to 32 bits that support the portable 17 * C compiler and the standard C preprocessor. Wordsize (default 32) 18 * and bitfield assignment (default left-to-right, unlike VAX, PDP-11) 19 * should be predefined using the constants HOSTWDSZ and BITFRL and 20 * the C compiler "-D" flag (e.g., -DHOSTWDSZ=36 -DBITFLR for the DEC-20). 21 * Note that the macro arguments assume that the integer being referenced 22 * is a 32-bit integer (right-justified on the 20) and that bit 0 is the 23 * most significant bit. 24 */ 25 26 #ifndef HOSTWDSZ 27 #define HOSTWDSZ 32 28 #endif 29 30 31 /*########################### Macros ######################################*/ 32 33 /*------------------------------------------------------------------------- 34 * NewDeclareBitField_Reference - Declare a structure similar to the simulator 35 * function "DeclBitfR" except its use is restricted to occur within a larger 36 * enclosing structure or union definition. This declaration is an unnamed 37 * structure with the argument, name, as the member name and the argument, 38 * uname, as the element name. 39 *----------------------------------------------------------------------- */ 40 #define Bitfield_extract(start, length, object) \ 41 ((object) >> (HOSTWDSZ - (start) - (length)) & \ 42 ((unsigned)-1 >> (HOSTWDSZ - (length)))) 43 44 #define Bitfield_signed_extract(start, length, object) \ 45 ((int)((object) << start) >> (HOSTWDSZ - (length))) 46 47 #define Bitfield_mask(start, len, object) \ 48 ((object) & (((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len))) 49 50 #define Bitfield_deposit(value,start,len,object) object = \ 51 ((object) & ~(((unsigned)-1 >> (HOSTWDSZ-len)) << (HOSTWDSZ-start-len))) | \ 52 (((value) & ((unsigned)-1 >> (HOSTWDSZ-len))) << (HOSTWDSZ-start-len)) 53