Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 257 insertions, 0 deletions

diff --git a/sim/ppc/bits.h b/sim/ppc/bits.h
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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].
+
+   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).
+
+   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))
+
+
+/* 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)
+
+#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);
+
+
+/* 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);
+
+
+/* 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_ */