1/* libunwind - a platform-independent unwind library
2   Copyright (c) 2002-2004 Hewlett-Packard Development Company, L.P.
3        Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5   Modified for x86_64 by Max Asbock <masbock@us.ibm.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
30#if 0
31static inline dwarf_loc_t
32linux_scratch_loc (struct cursor *c, unw_regnum_t reg)
33{
34  unw_word_t addr = c->sigcontext_addr;
35
36  switch (c->sigcontext_format)
37    {
38    case X86_64_SCF_NONE:
39      return DWARF_REG_LOC (&c->dwarf, reg);
40
41    case X86_64_SCF_LINUX_RT_SIGFRAME:
42      addr += LINUX_UC_MCONTEXT_OFF;
43      break;
44
45    case X86_64_SCF_FREEBSD_SIGFRAME:
46      addr += FREEBSD_UC_MCONTEXT_OFF;
47      break;
48    }
49
50  return DWARF_REG_LOC (&c->dwarf, reg);
51
52}
53
54HIDDEN dwarf_loc_t
55x86_64_scratch_loc (struct cursor *c, unw_regnum_t reg)
56{
57  if (c->sigcontext_addr)
58    return linux_scratch_loc (c, reg);
59  else
60    return DWARF_REG_LOC (&c->dwarf, reg);
61}
62#endif
63
64HIDDEN int
65tdep_access_reg (struct cursor *c, unw_regnum_t reg, unw_word_t *valp,
66                 int write)
67{
68  dwarf_loc_t loc = DWARF_NULL_LOC;
69  unsigned int mask;
70  int arg_num;
71
72  switch (reg)
73    {
74
75    case UNW_X86_64_RIP:
76      if (write)
77        c->dwarf.ip = *valp;            /* also update the RIP cache */
78      loc = c->dwarf.loc[RIP];
79      break;
80
81    case UNW_X86_64_CFA:
82    case UNW_X86_64_RSP:
83      if (write)
84        return -UNW_EREADONLYREG;
85      *valp = c->dwarf.cfa;
86      return 0;
87
88    case UNW_X86_64_RAX:
89    case UNW_X86_64_RDX:
90      arg_num = reg - UNW_X86_64_RAX;
91      mask = (1 << arg_num);
92      if (write)
93        {
94          c->dwarf.eh_args[arg_num] = *valp;
95          c->dwarf.eh_valid_mask |= mask;
96          return 0;
97        }
98      else if ((c->dwarf.eh_valid_mask & mask) != 0)
99        {
100          *valp = c->dwarf.eh_args[arg_num];
101          return 0;
102        }
103      else
104        loc = c->dwarf.loc[(reg == UNW_X86_64_RAX) ? RAX : RDX];
105      break;
106
107    case UNW_X86_64_RCX: loc = c->dwarf.loc[RCX]; break;
108    case UNW_X86_64_RBX: loc = c->dwarf.loc[RBX]; break;
109
110    case UNW_X86_64_RBP: loc = c->dwarf.loc[RBP]; break;
111    case UNW_X86_64_RSI: loc = c->dwarf.loc[RSI]; break;
112    case UNW_X86_64_RDI: loc = c->dwarf.loc[RDI]; break;
113    case UNW_X86_64_R8: loc = c->dwarf.loc[R8]; break;
114    case UNW_X86_64_R9: loc = c->dwarf.loc[R9]; break;
115    case UNW_X86_64_R10: loc = c->dwarf.loc[R10]; break;
116    case UNW_X86_64_R11: loc = c->dwarf.loc[R11]; break;
117    case UNW_X86_64_R12: loc = c->dwarf.loc[R12]; break;
118    case UNW_X86_64_R13: loc = c->dwarf.loc[R13]; break;
119    case UNW_X86_64_R14: loc = c->dwarf.loc[R14]; break;
120    case UNW_X86_64_R15: loc = c->dwarf.loc[R15]; break;
121
122    default:
123      Debug (1, "bad register number %u\n", reg);
124      return -UNW_EBADREG;
125    }
126
127  if (write)
128    return dwarf_put (&c->dwarf, loc, *valp);
129  else
130    return dwarf_get (&c->dwarf, loc, valp);
131}
132
133HIDDEN int
134tdep_access_fpreg (struct cursor *c, unw_regnum_t reg, unw_fpreg_t *valp,
135                   int write)
136{
137      return -UNW_EBADREG;
138}
139