1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2006-2007 IBM
3   Contributed by
4     Corey Ashford <cjashfor@us.ibm.com>
5     Jose Flavio Aguilar Paulino <jflavio@br.ibm.com> <joseflavio@gmail.com>
6
7This file is part of libunwind.
8
9Permission is hereby granted, free of charge, to any person obtaining
10a copy of this software and associated documentation files (the
11"Software"), to deal in the Software without restriction, including
12without limitation the rights to use, copy, modify, merge, publish,
13distribute, sublicense, and/or sell copies of the Software, and to
14permit persons to whom the Software is furnished to do so, subject to
15the following conditions:
16
17The above copyright notice and this permission notice shall be
18included in all copies or substantial portions of the Software.
19
20THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
27
28#include "unwind_i.h"
29
30HIDDEN int
31tdep_access_reg (struct cursor *c, unw_regnum_t reg, unw_word_t *valp,
32                 int write)
33{
34  struct dwarf_loc loc;
35
36  switch (reg)
37    {
38    case UNW_TDEP_IP:
39      if (write)
40        {
41          c->dwarf.ip = *valp;  /* update the IP cache */
42          if (c->dwarf.pi_valid && (*valp < c->dwarf.pi.start_ip
43                                    || *valp >= c->dwarf.pi.end_ip))
44            c->dwarf.pi_valid = 0;      /* new IP outside of current proc */
45        }
46      else
47        *valp = c->dwarf.ip;
48      return 0;
49
50    case UNW_TDEP_SP:
51      if (write)
52        return -UNW_EREADONLYREG;
53      *valp = c->dwarf.cfa;
54      return 0;
55
56
57    default:
58      break;
59    }
60
61  /* make sure it's not an FP or VR register */
62  if ((((unsigned) (reg - UNW_PPC32_F0)) <= 31))
63    return -UNW_EBADREG;
64
65  loc = c->dwarf.loc[reg];
66
67  if (write)
68    return dwarf_put (&c->dwarf, loc, *valp);
69  else
70    return dwarf_get (&c->dwarf, loc, valp);
71}
72
73HIDDEN int
74tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, unw_fpreg_t *valp,
75                   int write)
76{
77  struct dwarf_loc loc;
78
79  if ((unsigned) (reg - UNW_PPC32_F0) < 32)
80  {
81    loc = c->dwarf.loc[reg];
82    if (write)
83      return dwarf_putfp (&c->dwarf, loc, *valp);
84    else
85      return dwarf_getfp (&c->dwarf, loc, valp);
86  }
87
88  return -UNW_EBADREG;
89}
90
91