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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20
  21 #include "defs.h"
  22
  23 #include "frame.h"
  24 #include "bfd.h"
  25 #include "gdbcore.h"
  26 #include "symtab.h"
  27
  28 /*
  29
  30 GLOBAL FUNCTION
  31
  32         coff_solib_add -- add a shared library files to the symtab list.  We
  33         examine the `.lib' section of the exec file and determine the names of
  34         the shared libraries.
  35
  36         This function is responsible for discovering those names and
  37         addresses, and saving sufficient information about them to allow
  38         their symbols to be read at a later time.
  39
  40 SYNOPSIS
  41
  42         void coff_solib_add (char *arg_string, int from_tty,
  43                              struct target_ops *target)
  44
  45 DESCRIPTION
  46
  47 */
  48
  49 void
  50 coff_solib_add (arg_string, from_tty, target)
  51      char *arg_string;
  52      int from_tty;
  53      struct target_ops *target;
  54 {
  55   asection *libsect;
  56
  57   libsect = bfd_get_section_by_name (exec_bfd, ".lib");
  58
  59   if (libsect)
  60     {
  61       int libsize;
  62       unsigned char *lib;
  63       struct libent
  64         {
  65           bfd_byte len[4];
  66           bfd_byte nameoffset[4];
  67         };
  68
  69       libsize = bfd_section_size (exec_bfd, libsect);
  70
  71       lib = (unsigned char *) 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           int len, nameoffset;
  80           char *filename;
  81
  82           ent = (struct libent *)lib;
  83
  84           len = bfd_get_32 (exec_bfd, ent->len);
  85
  86           nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);
  87
  88           if (len <= 0)
  89             break;
  90
  91           filename = (char *)ent + nameoffset * 4;
  92
  93           objfile = symbol_file_add (filename, from_tty,
  94                                      0, /* addr */
  95                                      0, /* not mainline */
  96                                      0, /* not mapped */
  97                                      0, /* Not readnow */
  98                                      0, /* Not user loaded */
  99                                      1); /* Is a solib */
 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
 131 coff_solib_create_inferior_hook()
 132 {
 133   coff_solib_add ((char *) 0, 0, (struct target_ops *) 0);
 134 }