_UPT_get_dyn_info_list_addr.c revision 25ee9f81727616f3269032c52483e4421d451291 
1/* libunwind - a platform-independent unwind library
2   Copyright (C) 2003-2005 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 "_UPT_internal.h"
27
28#if UNW_TARGET_IA64 && defined(__linux)
29# include "elf64.h"
30# include "os-linux.h"
31
32static inline int
33get_list_addr (unw_addr_space_t as, unw_word_t *dil_addr, void *arg,
34	       int *countp)
35{
36  unsigned long lo, hi, off;
37  struct UPT_info *ui = arg;
38  struct map_iterator mi;
39  char path[PATH_MAX];
40  unw_word_t res;
41  int count = 0;
42
43  maps_init (&mi, ui->pid);
44  while (maps_next (&mi, &lo, &hi, &off))
45    {
46      if (off)
47	continue;
48
49      invalidate_edi(&ui->edi);
50
51      if (elf_map_image (&ui->edi.ei, path) < 0)
52	/* ignore unmappable stuff like "/SYSV00001b58 (deleted)" */
53	continue;
54
55      Debug (16, "checking object %s\n", path);
56
57      if (_UPTi_find_unwind_table (&ui->edi, as, path, lo, off, 0) > 0)
58	{
59	  res = _Uia64_find_dyn_list (as, &ui->edi.di_cache, arg);
60	  if (res && count++ == 0)
61	    {
62	      Debug (12, "dyn_info_list_addr = 0x%lx\n", (long) res);
63	      *dil_addr = res;
64	    }
65	}
66    }
67  maps_close (&mi);
68  *countp = count;
69  return 0;
70}
71
72#else
73
74static inline int
75get_list_addr (unw_addr_space_t as, unw_word_t *dil_addr, void *arg,
76	       int *countp)
77{
78# warning Implement get_list_addr(), please.
79  *countp = 0;
80  return 0;
81}
82
83#endif
84
85int
86_UPT_get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dil_addr,
87			     void *arg)
88{
89  int count, ret;
90
91  Debug (12, "looking for dyn_info list\n");
92
93  if ((ret = get_list_addr (as, dil_addr, arg, &count)) < 0)
94    return ret;
95
96  /* If multiple dynamic-info list addresses are found, we would have
97     to determine which was is the one actually in use (since the
98     dynamic name resolution algorithm will pick one "winner").
99     Perhaps we'd have to track them all until we find one that's
100     non-empty.  Hopefully, this case simply will never arise, since
101     only libunwind defines the dynamic info list head. */
102  assert (count <= 1);
103
104  return (count > 0) ? 0 : -UNW_ENOINFO;
105}
106