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
52void
53coff_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
130void
131coff_solib_create_inferior_hook (void)
132{
133  coff_solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
134}
135