1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2002-2005 Hewlett-Packard Co
3	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5This file is part of libunwind.
6
7Permission is hereby granted, free of charge, to any person obtaining
8a copy of this software and associated documentation files (the
9"Software"), to deal in the Software without restriction, including
10without limitation the rights to use, copy, modify, merge, publish,
11distribute, sublicense, and/or sell copies of the Software, and to
12permit persons to whom the Software is furnished to do so, subject to
13the following conditions:
14
15The above copyright notice and this permission notice shall be
16included in all copies or substantial portions of the Software.
17
18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
25
26#include "unwind_i.h"
27
28/* Apply rotation to a general register.  REG must be in the range 0-127.  */
29
30static inline int
31rotate_gr (struct cursor *c, int reg)
32{
33  unsigned int rrb_gr, sor;
34  int preg;
35
36  sor = 8 * ((c->cfm >> 14) & 0xf);
37  rrb_gr = (c->cfm >> 18) & 0x7f;
38
39  if ((unsigned) (reg - 32) >= sor)
40    preg = reg;
41  else
42    {
43      preg = reg + rrb_gr;	/* apply rotation */
44      if ((unsigned) (preg - 32) >= sor)
45	preg -= sor;		/* wrap around */
46    }
47  if (sor)
48    Debug (15, "sor=%u rrb.gr=%u, r%d -> r%d\n", sor, rrb_gr, reg, preg);
49  return preg;
50}
51
52/* Apply rotation to a floating-point register.  The number REG must
53   be in the range of 0-127.  */
54
55static inline int
56rotate_fr (struct cursor *c, int reg)
57{
58  unsigned int rrb_fr;
59  int preg;
60
61  rrb_fr = (c->cfm >> 25) & 0x7f;
62  if (reg < 32)
63    preg = reg;		/* register not part of the rotating partition */
64  else
65    {
66      preg = reg + rrb_fr;	/* apply rotation */
67      if (preg > 127)
68	preg -= 96;		/* wrap around */
69    }
70  if (rrb_fr)
71    Debug (15, "rrb.fr=%u, f%d -> f%d\n", rrb_fr, reg, preg);
72  return preg;
73}
74