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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [sim/] [ppc/] [bits.h] - Blame information for rev 827

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1 24 jeremybenn
/*  This file is part of the program psim.
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    Copyright (C) 1994-1995, Andrew Cagney <cagney@highland.com.au>
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    This program is free software; you can redistribute it and/or modify
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    it under the terms of the GNU General Public License as published by
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    the Free Software Foundation; either version 2 of the License, or
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    (at your option) any later version.
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    This program is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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    GNU General Public License for more details.
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    You should have received a copy of the GNU General Public License
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    along with this program; if not, write to the Free Software
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    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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    */
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#ifndef _BITS_H_
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#define _BITS_H_
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/* bit manipulation routines:
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   Bit numbering: The bits are numbered according to the PowerPC
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   convention - the left most (or most significant) is bit 0 while the
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   right most (least significant) is bit 1.
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   Size convention: Each macro is in three forms - <MACRO>32 which
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   operates in 32bit quantity (bits are numbered 0..31); <MACRO>64
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   which operates using 64bit quantites (and bits are numbered 0..64);
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   and <MACRO> which operates using the bit size of the target
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   architecture (bits are still numbered 0..63), with 32bit
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   architectures ignoring the first 32bits having bit 32 as the most
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   significant.
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   BIT*(POS): Quantity with just 1 bit set.
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   MASK*(FIRST, LAST): Create a constant bit mask of the specified
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   size with bits [FIRST .. LAST] set.
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   MASKED*(VALUE, FIRST, LAST): Masks out all but bits [FIRST
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   .. LAST].
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   LSMASKED*(VALUE, FIRST, LAST): Like MASKED - LS bit is zero.
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   EXTRACTED*(VALUE, FIRST, LAST): Masks out bits [FIRST .. LAST] but
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   also right shifts the masked value so that bit LAST becomes the
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   least significant (right most).
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   LSEXTRACTED*(VALUE, FIRST, LAST): Same as extracted - LS bit is
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   zero.
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   SHUFFLED**(VALUE, OLD, NEW): Mask then move a single bit from OLD
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   new NEW.
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   MOVED**(VALUE, OLD_FIRST, OLD_LAST, NEW_FIRST, NEW_LAST): Moves
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   things around so that bits OLD_FIRST..OLD_LAST are masked then
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   moved to NEW_FIRST..NEW_LAST.
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   INSERTED*(VALUE, FIRST, LAST): Takes VALUE and `inserts' the (LAST
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   - FIRST + 1) least significant bits into bit positions [ FIRST
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   .. LAST ].  This is almost the complement to EXTRACTED.
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   IEA_MASKED(SHOULD_MASK, ADDR): Convert the address to the targets
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   natural size.  If in 32bit mode, discard the high 32bits.
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   EXTENDED(VALUE): Convert VALUE (32bits of it) to the targets
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   natural size.  If in 64bit mode, sign extend the value.
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   ALIGN_*(VALUE): Round upwards the value so that it is aligned.
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   FLOOR_*(VALUE): Truncate the value so that it is aligned.
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   ROTL*(VALUE, NR_BITS): Return the value rotated by NR_BITS
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   */
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#define _MAKE_SHIFT(WIDTH, pos) ((WIDTH) - 1 - (pos))
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#if (WITH_TARGET_WORD_MSB == 0)
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#define _LSB_POS(WIDTH, SHIFT) (WIDTH - 1 - SHIFT)
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#else
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#define _LSB_POS(WIDTH, SHIFT) (SHIFT)
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#endif
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/* MakeBit */
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#define _BITn(WIDTH, pos) (((natural##WIDTH)(1)) \
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                           << _MAKE_SHIFT(WIDTH, pos))
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#define BIT4(POS)  (1 << _MAKE_SHIFT(4, POS))
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#define BIT5(POS)  (1 << _MAKE_SHIFT(5, POS))
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#define BIT8(POS)  (1 << _MAKE_SHIFT(8, POS))
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#define BIT10(POS)  (1 << _MAKE_SHIFT(10, POS))
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#define BIT32(POS) _BITn(32, POS)
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#define BIT64(POS) _BITn(64, POS)
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#if (WITH_TARGET_WORD_BITSIZE == 64)
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#define BIT(POS)   BIT64(POS)
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#else
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#define BIT(POS)   (((POS) < 32) ? 0 : _BITn(32, (POS)-32))
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#endif
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/* multi bit mask */
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#define _MASKn(WIDTH, START, STOP) \
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(((((unsigned##WIDTH)0) - 1) \
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  >> (WIDTH - ((STOP) - (START) + 1))) \
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 << (WIDTH - 1 - (STOP)))
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#define MASK32(START, STOP)   _MASKn(32, START, STOP)
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#define MASK64(START, STOP)   _MASKn(64, START, STOP)
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/* Multi-bit mask on least significant bits */
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#define _LSMASKn(WIDTH, FIRST, LAST) _MASKn (WIDTH, \
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                                             _LSB_POS (WIDTH, FIRST), \
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                                             _LSB_POS (WIDTH, LAST))
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#define LSMASK64(FIRST, LAST)  _LSMASKn (64, (FIRST), (LAST))
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#if (WITH_TARGET_WORD_BITSIZE == 64)
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#define MASK(START, STOP) \
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(((START) <= (STOP)) \
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 ? _MASKn(64, START, STOP) \
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 : (_MASKn(64, 0, STOP) \
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    | _MASKn(64, START, 63)))
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#else
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#define MASK(START, STOP) \
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(((START) <= (STOP)) \
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 ? (((STOP) < 32) \
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    ? 0 \
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    : _MASKn(32, \
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             (START) < 32 ? 0 : (START) - 32, \
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             (STOP)-32)) \
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 : (_MASKn(32, \
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           (START) < 32 ? 0 : (START) - 32, \
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           31) \
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    | (((STOP) < 32) \
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       ? 0 \
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       : _MASKn(32, \
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                0, \
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                (STOP) - 32))))
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#endif
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/* mask the required bits, leaving them in place */
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INLINE_BITS\
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(unsigned32) MASKED32
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(unsigned32 word,
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 unsigned start,
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 unsigned stop);
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INLINE_BITS\
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(unsigned64) MASKED64
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(unsigned64 word,
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 unsigned start,
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 unsigned stop);
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INLINE_BITS\
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(unsigned_word) MASKED
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(unsigned_word word,
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 unsigned start,
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 unsigned stop);
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INLINE_BITS\
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(unsigned64) LSMASKED64
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(unsigned64 word,
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 int first,
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  int last);
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/* extract the required bits aligning them with the lsb */
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#define _EXTRACTEDn(WIDTH, WORD, START, STOP) \
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((((natural##WIDTH)(WORD)) >> (WIDTH - (STOP) - 1)) \
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 & _MASKn(WIDTH, WIDTH-1+(START)-(STOP), WIDTH-1))
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/* #define EXTRACTED10(WORD, START, STOP) _EXTRACTEDn(10, WORD, START, STOP) */
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#define EXTRACTED32(WORD, START, STOP) _EXTRACTEDn(32, WORD, START, STOP)
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#define EXTRACTED64(WORD, START, STOP) _EXTRACTEDn(64, WORD, START, STOP)
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INLINE_BITS\
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(unsigned_word) EXTRACTED
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(unsigned_word val,
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 unsigned start,
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 unsigned stop);
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INLINE_BITS\
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(unsigned64) LSEXTRACTED64
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(unsigned64 val,
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 int start,
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 int stop);
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/* move a single bit around */
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/* NB: the wierdness (N>O?N-O:0) is to stop a warning from GCC */
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#define _SHUFFLEDn(N, WORD, OLD, NEW) \
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((OLD) < (NEW) \
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 ? (((unsigned##N)(WORD) \
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     >> (((NEW) > (OLD)) ? ((NEW) - (OLD)) : 0)) \
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    & MASK32((NEW), (NEW))) \
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 : (((unsigned##N)(WORD) \
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     << (((OLD) > (NEW)) ? ((OLD) - (NEW)) : 0)) \
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    & MASK32((NEW), (NEW))))
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#define SHUFFLED32(WORD, OLD, NEW) _SHUFFLEDn(32, WORD, OLD, NEW)
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#define SHUFFLED64(WORD, OLD, NEW) _SHUFFLEDn(64, WORD, OLD, NEW)
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#define SHUFFLED(WORD, OLD, NEW) _SHUFFLEDn(_word, WORD, OLD, NEW)
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/* move a group of bits around */
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#define _INSERTEDn(N, WORD, START, STOP) \
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(((natural##N)(WORD) << _MAKE_SHIFT(N, STOP)) & _MASKn(N, START, STOP))
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#define INSERTED32(WORD, START, STOP) _INSERTEDn(32, WORD, START, STOP)
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#define INSERTED64(WORD, START, STOP) _INSERTEDn(64, WORD, START, STOP)
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INLINE_BITS\
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(unsigned_word) INSERTED
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(unsigned_word val,
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 unsigned start,
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 unsigned stop);
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/* depending on MODE return a 64bit or 32bit (sign extended) value */
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#if (WITH_TARGET_WORD_BITSIZE == 64)
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#define EXTENDED(X)     ((signed64)(signed32)(X))
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#else
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#define EXTENDED(X)     (X)
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#endif
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/* memory alignment macro's */
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#define _ALIGNa(A,X)  (((X) + ((A) - 1)) & ~((A) - 1))
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#define _FLOORa(A,X)  ((X) & ~((A) - 1))
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#define ALIGN_8(X)      _ALIGNa(8, X)
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#define ALIGN_16(X)     _ALIGNa(16, X)
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#define ALIGN_PAGE(X)   _ALIGNa(0x1000, X)
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#define FLOOR_PAGE(X)   ((X) & ~(0x1000 - 1))
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/* bit bliting macro's */
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#define BLIT32(V, POS, BIT) \
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do { \
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  if (BIT) \
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    V |= BIT32(POS); \
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  else \
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    V &= ~BIT32(POS); \
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} while (0)
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#define MBLIT32(V, LO, HI, VAL) \
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do { \
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  (V) = (((V) & ~MASK32((LO), (HI))) \
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         | INSERTED32(VAL, LO, HI)); \
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} while (0)
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/* some rotate functions to make things easier
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   NOTE: These are functions not macro's as the latter tickles bugs in
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   gcc-2.6.3 */
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#define _ROTLn(N, VAL, SHIFT) \
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(((VAL) << (SHIFT)) | ((VAL) >> ((N)-(SHIFT))))
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INLINE_BITS\
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(unsigned32) ROTL32
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(unsigned32 val,
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 long shift);
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INLINE_BITS\
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(unsigned64) ROTL64
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(unsigned64 val,
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 long shift);
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#if (BITS_INLINE & INCLUDE_MODULE)
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#include "bits.c"
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#endif
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#endif /* _BITS_H_ */

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