1 /* Handle COFF SVR3 shared libraries for GDB, the GNU Debugger.
2 Copyright 1993, 1994, 1998, 1999, 2000 Free Software Foundation, Inc.
3
4 This file is part of GDB.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21
22 #include "defs.h"
23
24 #include "frame.h"
25 #include "bfd.h"
26 #include "gdbcore.h"
27 #include "symtab.h"
28 #include "symfile.h"
29 #include "objfiles.h"
30
31 /*
32
33 GLOBAL FUNCTION
34
35 coff_solib_add -- add a shared library files to the symtab list. We
36 examine the `.lib' section of the exec file and determine the names of
37 the shared libraries.
38
39 This function is responsible for discovering those names and
40 addresses, and saving sufficient information about them to allow
41 their symbols to be read at a later time.
42
43 SYNOPSIS
44
45 void coff_solib_add (char *arg_string, int from_tty,
46 struct target_ops *target, int readsyms)
47
48 DESCRIPTION
49
50 */
51
52 void
coff_solib_add(char * arg_string,int from_tty,struct target_ops * target,int readsyms)53 coff_solib_add (char *arg_string, int from_tty, struct target_ops *target, int readsyms)
54 {
55 asection *libsect;
56
57 if (!readsyms)
58 return;
59
60 libsect = bfd_get_section_by_name (exec_bfd, ".lib");
61
62 if (libsect)
63 {
64 int libsize;
65 unsigned char *lib;
66 struct libent
67 {
68 bfd_byte len[4];
69 bfd_byte nameoffset[4];
70 };
71
72 libsize = bfd_section_size (exec_bfd, libsect);
73
74 lib = (unsigned char *) alloca (libsize);
75
76 bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);
77
78 while (libsize > 0)
79 {
80 struct libent *ent;
81 struct objfile *objfile;
82 int len, nameoffset;
83 char *filename;
84
85 ent = (struct libent *) lib;
86
87 len = bfd_get_32 (exec_bfd, ent->len);
88
89 nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);
90
91 if (len <= 0)
92 break;
93
94 filename = (char *) ent + nameoffset * 4;
95
96 objfile = symbol_file_add (filename, from_tty,
97 NULL, /* no offsets */
98 0, /* not mainline */
99 OBJF_SHARED); /* flags */
100
101 libsize -= len * 4;
102 lib += len * 4;
103 }
104
105 /* Getting new symbols may change our opinion about what is
106 frameless. */
107 reinit_frame_cache ();
108 }
109 }
110
111 /*
112
113 GLOBAL FUNCTION
114
115 coff_solib_create_inferior_hook -- shared library startup support
116
117 SYNOPSIS
118
119 void coff_solib_create_inferior_hook()
120
121 DESCRIPTION
122
123 When gdb starts up the inferior, the kernel maps in the shared
124 libraries. We get here with the target stopped at it's first
125 instruction, and the libraries already mapped. At this point, this
126 function gets called via expansion of the macro
127 SOLIB_CREATE_INFERIOR_HOOK.
128 */
129
130 void
coff_solib_create_inferior_hook(void)131 coff_solib_create_inferior_hook (void)
132 {
133 coff_solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
134 }
135