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
38 static struct link_map_offsets *
legacy_svr4_fetch_link_map_offsets(void)39 legacy_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
145 extern initialize_file_ftype _initialize_svr4_lm; /* -Wmissing-prototypes */
146
147 void
_initialize_svr4_lm(void)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