1/* Handle shared libraries for GDB, the GNU Debugger.
2
3   Copyright 2000, 2004
4   Free Software Foundation, Inc.
5
6   This file is part of GDB.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 59 Temple Place - Suite 330,
21   Boston, MA 02111-1307, USA.  */
22
23struct objfile;
24
25/* Critical offsets and sizes which describe struct r_debug and
26   struct link_map on SVR4-like targets.  All offsets and sizes are
27   in bytes unless otherwise specified.  */
28
29struct link_map_offsets
30  {
31    /* Size of struct r_debug (or equivalent), or at least enough of it to
32       be able to obtain the r_map field.  */
33    int r_debug_size;
34
35    /* Offset to the r_map field in struct r_debug.  */
36    int r_map_offset;
37
38    /* Size of the r_map field in struct r_debug.  */
39    int r_map_size;
40
41    /* Size of struct link_map (or equivalent), or at least enough of it
42       to be able to obtain the fields below.  */
43    int link_map_size;
44
45    /* Offset to l_addr field in struct link_map.  */
46    int l_addr_offset;
47
48    /* Size of l_addr field in struct link_map.  */
49    int l_addr_size;
50
51    /* Offset to l_next field in struct link_map.  */
52    int l_next_offset;
53
54    /* Size of l_next field in struct link_map.  */
55    int l_next_size;
56
57    /* Offset to l_prev field in struct link_map.  */
58    int l_prev_offset;
59
60    /* Size of l_prev field in struct link_map.  */
61    int l_prev_size;
62
63    /* Offset to l_name field in struct link_map.  */
64    int l_name_offset;
65
66    /* Size of l_name field in struct link_map.  */
67    int l_name_size;
68  };
69
70/* set_solib_svr4_fetch_link_map_offsets() is intended to be called by
71   a <arch>_gdbarch_init() function.  It is used to establish an
72   architecture specific link_map_offsets fetcher for the architecture
73   being defined.  */
74
75extern void set_solib_svr4_fetch_link_map_offsets
76  (struct gdbarch *gdbarch, struct link_map_offsets *(*func) (void));
77
78/* This function is called by thread_db.c.  Return the address of the
79   link map for the given objfile.  */
80extern CORE_ADDR svr4_fetch_objfile_link_map (struct objfile *objfile);
81
82/* legacy_svr4_fetch_link_map_offsets_hook is a pointer to a function
83   which is used to fetch link map offsets.  It will only be set
84   by solib-legacy.c, if at all. */
85extern struct link_map_offsets *(*legacy_svr4_fetch_link_map_offsets_hook)(void);
86
87/* Fetch (and possibly build) an appropriate `struct link_map_offsets'
88   for ILP32 and LP64 SVR4 systems.  */
89extern struct link_map_offsets *svr4_ilp32_fetch_link_map_offsets (void);
90extern struct link_map_offsets *svr4_lp64_fetch_link_map_offsets (void);
91