gdb/coff-solib.c

   1 /* Handle COFF SVR3 shared libraries for GDB, the GNU Debugger.
   2    Copyright 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 #include "defs.h"
  22
  23 #include "bfd.h"
  24 #include "gdbcore.h"
  25 #include "symtab.h"
  26
  27 /*
  28
  29 GLOBAL FUNCTION
  30
  31         coff_solib_add -- add a shared library files to the symtab list.  We
  32         examine the `.lib' section of the exec file and determine the names of
  33         the shared libraries.
  34
  35         This function is responsible for discovering those names and
  36         addresses, and saving sufficient information about them to allow
  37         their symbols to be read at a later time.
  38
  39 SYNOPSIS
  40
  41         void coff_solib_add (char *arg_string, int from_tty,
  42                              struct target_ops *target)
  43
  44 DESCRIPTION
  45
  46 */
  47
  48 void
  49 coff_solib_add (arg_string, from_tty, target)
  50      char *arg_string;
  51      int from_tty;
  52      struct target_ops *target;
  53 {
  54   asection *libsect;
  55
  56   libsect = bfd_get_section_by_name (exec_bfd, ".lib");
  57
  58   if (libsect)
  59     {
  60       int libsize;
  61       unsigned char *lib;
  62       struct libent
  63         {
  64           long len;
  65           long unk;
  66           char filename[1];
  67         };
  68
  69       libsize = bfd_section_size (exec_bfd, libsect);
  70
  71       lib = alloca (libsize);
  72
  73       bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);
  74
  75       while (libsize > 0)
  76         {
  77           struct libent *ent;
  78           struct objfile *objfile;
  79
  80           ent = (struct libent *)lib;
  81
  82           if (ent->len <= 0)
  83             break;
  84
  85           objfile = symbol_file_add (ent->filename, from_tty,
  86                                      0, /* addr */
  87                                      0, /* not mainline */
  88                                      0, /* not mapped */
  89                                      0); /* Not readnow */
  90           libsize -= ent->len * 4;
  91           lib += ent->len * 4;
  92         }
  93     }
  94 }
  95
  96 /*
  97
  98 GLOBAL FUNCTION
  99
 100         coff_solib_create_inferior_hook -- shared library startup support
 101
 102 SYNOPSIS
 103
 104         void coff_solib_create_inferior_hook()
 105
 106 DESCRIPTION
 107
 108         When gdb starts up the inferior, the kernel maps in the shared
 109         libraries.  We get here with the target stopped at it's first
 110         instruction, and the libraries already mapped.  At this point, this
 111         function gets called via expansion of the macro
 112         SOLIB_CREATE_INFERIOR_HOOK.
 113   */
 114
 115 void
 116 coff_solib_create_inferior_hook()
 117 {
 118   coff_solib_add ((char *) 0, 0, (struct target_ops *) 0);
 119 }