1/* Provide legacy r_debug and link_map support for SVR4-like native targets.
2   Copyright 2000, 2001
3   Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 2 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 59 Temple Place - Suite 330,
20   Boston, MA 02111-1307, USA.  */
21
22#include "defs.h"
23#include "gdbcore.h"
24#include "solib-svr4.h"
25
26#ifdef HAVE_LINK_H
27
28#ifdef HAVE_NLIST_H
29/* nlist.h needs to be included before link.h on some older *BSD systems. */
30#include <nlist.h>
31#endif
32
33#include <link.h>
34
35/* Fetch (and possibly build) an appropriate link_map_offsets structure
36   for native targets using struct definitions from link.h.  */
37
38static struct link_map_offsets *
39legacy_svr4_fetch_link_map_offsets (void)
40{
41  static struct link_map_offsets lmo;
42  static struct link_map_offsets *lmp = 0;
43#if defined (HAVE_STRUCT_LINK_MAP32)
44  static struct link_map_offsets lmo32;
45  static struct link_map_offsets *lmp32 = 0;
46#endif
47
48#ifndef offsetof
49#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
50#endif
51#define fieldsize(TYPE, MEMBER) (sizeof (((TYPE *)0)->MEMBER))
52
53  if (lmp == 0)
54    {
55      lmp = &lmo;
56
57#ifdef HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS
58      lmo.r_debug_size = sizeof (struct r_debug);
59
60      lmo.r_map_offset = offsetof (struct r_debug, r_map);
61      lmo.r_map_size = fieldsize (struct r_debug, r_map);
62
63      lmo.link_map_size = sizeof (struct link_map);
64
65      lmo.l_addr_offset = offsetof (struct link_map, l_addr);
66      lmo.l_addr_size = fieldsize (struct link_map, l_addr);
67
68      lmo.l_next_offset = offsetof (struct link_map, l_next);
69      lmo.l_next_size = fieldsize (struct link_map, l_next);
70
71      lmo.l_prev_offset = offsetof (struct link_map, l_prev);
72      lmo.l_prev_size = fieldsize (struct link_map, l_prev);
73
74      lmo.l_name_offset = offsetof (struct link_map, l_name);
75      lmo.l_name_size = fieldsize (struct link_map, l_name);
76#else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS) */
77#ifdef HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS
78      lmo.link_map_size = sizeof (struct link_map);
79
80      lmo.l_addr_offset = offsetof (struct link_map, lm_addr);
81      lmo.l_addr_size = fieldsize (struct link_map, lm_addr);
82
83      lmo.l_next_offset = offsetof (struct link_map, lm_next);
84      lmo.l_next_size = fieldsize (struct link_map, lm_next);
85
86      lmo.l_name_offset = offsetof (struct link_map, lm_name);
87      lmo.l_name_size = fieldsize (struct link_map, lm_name);
88#else /* !defined(HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS) */
89#if HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS
90      lmo.link_map_size = sizeof (struct so_map);
91
92      lmo.l_addr_offset = offsetof (struct so_map, som_addr);
93      lmo.l_addr_size = fieldsize (struct so_map, som_addr);
94
95      lmo.l_next_offset = offsetof (struct so_map, som_next);
96      lmo.l_next_size = fieldsize (struct so_map, som_next);
97
98      lmo.l_name_offset = offsetof (struct so_map, som_path);
99      lmo.l_name_size = fieldsize (struct so_map, som_path);
100#endif /* HAVE_STRUCT_SO_MAP_WITH_SOM_MEMBERS */
101#endif /* HAVE_STRUCT_LINK_MAP_WITH_LM_MEMBERS */
102#endif /* HAVE_STRUCT_LINK_MAP_WITH_L_MEMBERS */
103    }
104
105#if defined (HAVE_STRUCT_LINK_MAP32)
106  if (lmp32 == 0)
107    {
108      lmp32 = &lmo32;
109
110      lmo32.r_debug_size = sizeof (struct r_debug32);
111
112      lmo32.r_map_offset = offsetof (struct r_debug32, r_map);
113      lmo32.r_map_size = fieldsize (struct r_debug32, r_map);
114
115      lmo32.link_map_size = sizeof (struct link_map32);
116
117      lmo32.l_addr_offset = offsetof (struct link_map32, l_addr);
118      lmo32.l_addr_size = fieldsize (struct link_map32, l_addr);
119
120      lmo32.l_next_offset = offsetof (struct link_map32, l_next);
121      lmo32.l_next_size = fieldsize (struct link_map32, l_next);
122
123      lmo32.l_prev_offset = offsetof (struct link_map32, l_prev);
124      lmo32.l_prev_size = fieldsize (struct link_map32, l_prev);
125
126      lmo32.l_name_offset = offsetof (struct link_map32, l_name);
127      lmo32.l_name_size = fieldsize (struct link_map32, l_name);
128    }
129#endif /* defined (HAVE_STRUCT_LINK_MAP32) */
130
131#if defined (HAVE_STRUCT_LINK_MAP32)
132  if (exec_bfd != NULL)
133    {
134      if (bfd_get_arch_size (exec_bfd) == 32)
135	return lmp32;
136    }
137  if (TARGET_PTR_BIT == 32)
138    return lmp32;
139#endif
140  return lmp;
141}
142
143#endif /* HAVE_LINK_H */
144
145extern initialize_file_ftype _initialize_svr4_lm; /* -Wmissing-prototypes */
146
147void
148_initialize_svr4_lm (void)
149{
150#ifdef HAVE_LINK_H
151  legacy_svr4_fetch_link_map_offsets_hook = legacy_svr4_fetch_link_map_offsets;
152#endif /* HAVE_LINK_H */
153}
154