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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-7.2/] [sim/] [ppc/] [bits.h] - Rev 378
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/* This file is part of the program psim. Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef _BITS_H_ #define _BITS_H_ /* bit manipulation routines: Bit numbering: The bits are numbered according to the PowerPC convention - the left most (or most significant) is bit 0 while the right most (least significant) is bit 1. Size convention: Each macro is in three forms - <MACRO>32 which operates in 32bit quantity (bits are numbered 0..31); <MACRO>64 which operates using 64bit quantites (and bits are numbered 0..64); and <MACRO> which operates using the bit size of the target architecture (bits are still numbered 0..63), with 32bit architectures ignoring the first 32bits having bit 32 as the most significant. BIT*(POS): Quantity with just 1 bit set. MASK*(FIRST, LAST): Create a constant bit mask of the specified size with bits [FIRST .. LAST] set. MASKED*(VALUE, FIRST, LAST): Masks out all but bits [FIRST .. LAST]. LSMASKED*(VALUE, FIRST, LAST): Like MASKED - LS bit is zero. EXTRACTED*(VALUE, FIRST, LAST): Masks out bits [FIRST .. LAST] but also right shifts the masked value so that bit LAST becomes the least significant (right most). LSEXTRACTED*(VALUE, FIRST, LAST): Same as extracted - LS bit is zero. SHUFFLED**(VALUE, OLD, NEW): Mask then move a single bit from OLD new NEW. MOVED**(VALUE, OLD_FIRST, OLD_LAST, NEW_FIRST, NEW_LAST): Moves things around so that bits OLD_FIRST..OLD_LAST are masked then moved to NEW_FIRST..NEW_LAST. INSERTED*(VALUE, FIRST, LAST): Takes VALUE and `inserts' the (LAST - FIRST + 1) least significant bits into bit positions [ FIRST .. LAST ]. This is almost the complement to EXTRACTED. IEA_MASKED(SHOULD_MASK, ADDR): Convert the address to the targets natural size. If in 32bit mode, discard the high 32bits. EXTENDED(VALUE): Convert VALUE (32bits of it) to the targets natural size. If in 64bit mode, sign extend the value. ALIGN_*(VALUE): Round upwards the value so that it is aligned. FLOOR_*(VALUE): Truncate the value so that it is aligned. ROTL*(VALUE, NR_BITS): Return the value rotated by NR_BITS */ #define _MAKE_SHIFT(WIDTH, pos) ((WIDTH) - 1 - (pos)) #if (WITH_TARGET_WORD_MSB == 0) #define _LSB_POS(WIDTH, SHIFT) (WIDTH - 1 - SHIFT) #else #define _LSB_POS(WIDTH, SHIFT) (SHIFT) #endif /* MakeBit */ #define _BITn(WIDTH, pos) (((natural##WIDTH)(1)) \ << _MAKE_SHIFT(WIDTH, pos)) #define BIT4(POS) (1 << _MAKE_SHIFT(4, POS)) #define BIT5(POS) (1 << _MAKE_SHIFT(5, POS)) #define BIT8(POS) (1 << _MAKE_SHIFT(8, POS)) #define BIT10(POS) (1 << _MAKE_SHIFT(10, POS)) #define BIT32(POS) _BITn(32, POS) #define BIT64(POS) _BITn(64, POS) #if (WITH_TARGET_WORD_BITSIZE == 64) #define BIT(POS) BIT64(POS) #else #define BIT(POS) (((POS) < 32) ? 0 : _BITn(32, (POS)-32)) #endif /* multi bit mask */ #define _MASKn(WIDTH, START, STOP) \ (((((unsigned##WIDTH)0) - 1) \ >> (WIDTH - ((STOP) - (START) + 1))) \ << (WIDTH - 1 - (STOP))) #define MASK32(START, STOP) _MASKn(32, START, STOP) #define MASK64(START, STOP) _MASKn(64, START, STOP) /* Multi-bit mask on least significant bits */ #define _LSMASKn(WIDTH, FIRST, LAST) _MASKn (WIDTH, \ _LSB_POS (WIDTH, FIRST), \ _LSB_POS (WIDTH, LAST)) #define LSMASK64(FIRST, LAST) _LSMASKn (64, (FIRST), (LAST)) #if (WITH_TARGET_WORD_BITSIZE == 64) #define MASK(START, STOP) \ (((START) <= (STOP)) \ ? _MASKn(64, START, STOP) \ : (_MASKn(64, 0, STOP) \ | _MASKn(64, START, 63))) #else #define MASK(START, STOP) \ (((START) <= (STOP)) \ ? (((STOP) < 32) \ ? 0 \ : _MASKn(32, \ (START) < 32 ? 0 : (START) - 32, \ (STOP)-32)) \ : (_MASKn(32, \ (START) < 32 ? 0 : (START) - 32, \ 31) \ | (((STOP) < 32) \ ? 0 \ : _MASKn(32, \ 0, \ (STOP) - 32)))) #endif /* mask the required bits, leaving them in place */ INLINE_BITS\ (unsigned32) MASKED32 (unsigned32 word, unsigned start, unsigned stop); INLINE_BITS\ (unsigned64) MASKED64 (unsigned64 word, unsigned start, unsigned stop); INLINE_BITS\ (unsigned_word) MASKED (unsigned_word word, unsigned start, unsigned stop); INLINE_BITS\ (unsigned64) LSMASKED64 (unsigned64 word, int first, int last); /* extract the required bits aligning them with the lsb */ #define _EXTRACTEDn(WIDTH, WORD, START, STOP) \ ((((natural##WIDTH)(WORD)) >> (WIDTH - (STOP) - 1)) \ & _MASKn(WIDTH, WIDTH-1+(START)-(STOP), WIDTH-1)) /* #define EXTRACTED10(WORD, START, STOP) _EXTRACTEDn(10, WORD, START, STOP) */ #define EXTRACTED32(WORD, START, STOP) _EXTRACTEDn(32, WORD, START, STOP) #define EXTRACTED64(WORD, START, STOP) _EXTRACTEDn(64, WORD, START, STOP) INLINE_BITS\ (unsigned_word) EXTRACTED (unsigned_word val, unsigned start, unsigned stop); INLINE_BITS\ (unsigned64) LSEXTRACTED64 (unsigned64 val, int start, int stop); /* move a single bit around */ /* NB: the wierdness (N>O?N-O:0) is to stop a warning from GCC */ #define _SHUFFLEDn(N, WORD, OLD, NEW) \ ((OLD) < (NEW) \ ? (((unsigned##N)(WORD) \ >> (((NEW) > (OLD)) ? ((NEW) - (OLD)) : 0)) \ & MASK32((NEW), (NEW))) \ : (((unsigned##N)(WORD) \ << (((OLD) > (NEW)) ? ((OLD) - (NEW)) : 0)) \ & MASK32((NEW), (NEW)))) #define SHUFFLED32(WORD, OLD, NEW) _SHUFFLEDn(32, WORD, OLD, NEW) #define SHUFFLED64(WORD, OLD, NEW) _SHUFFLEDn(64, WORD, OLD, NEW) #define SHUFFLED(WORD, OLD, NEW) _SHUFFLEDn(_word, WORD, OLD, NEW) /* move a group of bits around */ #define _INSERTEDn(N, WORD, START, STOP) \ (((natural##N)(WORD) << _MAKE_SHIFT(N, STOP)) & _MASKn(N, START, STOP)) #define INSERTED32(WORD, START, STOP) _INSERTEDn(32, WORD, START, STOP) #define INSERTED64(WORD, START, STOP) _INSERTEDn(64, WORD, START, STOP) INLINE_BITS\ (unsigned_word) INSERTED (unsigned_word val, unsigned start, unsigned stop); /* depending on MODE return a 64bit or 32bit (sign extended) value */ #if (WITH_TARGET_WORD_BITSIZE == 64) #define EXTENDED(X) ((signed64)(signed32)(X)) #else #define EXTENDED(X) (X) #endif /* memory alignment macro's */ #define _ALIGNa(A,X) (((X) + ((A) - 1)) & ~((A) - 1)) #define _FLOORa(A,X) ((X) & ~((A) - 1)) #define ALIGN_8(X) _ALIGNa(8, X) #define ALIGN_16(X) _ALIGNa(16, X) #define ALIGN_PAGE(X) _ALIGNa(0x1000, X) #define FLOOR_PAGE(X) ((X) & ~(0x1000 - 1)) /* bit bliting macro's */ #define BLIT32(V, POS, BIT) \ do { \ if (BIT) \ V |= BIT32(POS); \ else \ V &= ~BIT32(POS); \ } while (0) #define MBLIT32(V, LO, HI, VAL) \ do { \ (V) = (((V) & ~MASK32((LO), (HI))) \ | INSERTED32(VAL, LO, HI)); \ } while (0) /* some rotate functions to make things easier NOTE: These are functions not macro's as the latter tickles bugs in gcc-2.6.3 */ #define _ROTLn(N, VAL, SHIFT) \ (((VAL) << (SHIFT)) | ((VAL) >> ((N)-(SHIFT)))) INLINE_BITS\ (unsigned32) ROTL32 (unsigned32 val, long shift); INLINE_BITS\ (unsigned64) ROTL64 (unsigned64 val, long shift); #if (BITS_INLINE & INCLUDE_MODULE) #include "bits.c" #endif #endif /* _BITS_H_ */
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