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           bfd_byte len[4];
  65           bfd_byte nameoffset[4];
  66         };
  67
  68       libsize = bfd_section_size (exec_bfd, libsect);
  69
  70       lib = (unsigned char *) alloca (libsize);
  71
  72       bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);
  73
  74       while (libsize > 0)
  75         {
  76           struct libent *ent;
  77           struct objfile *objfile;
  78           int len, nameoffset;
  79           char *filename;
  80
  81           ent = (struct libent *)lib;
  82
  83           len = bfd_get_32 (exec_bfd, ent->len);
  84
  85           nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);
  86
  87           if (len <= 0)
  88             break;
  89
  90           filename = (char *)ent + nameoffset * 4;
  91
  92           objfile = symbol_file_add (filename, from_tty,
  93                                      0, /* addr */
  94                                      0, /* not mainline */
  95                                      0, /* not mapped */
  96                                      0); /* Not readnow */
  97           libsize -= len * 4;
  98           lib += len * 4;
  99         }
 100     }
 101 }
 102
 103 /*
 104
 105 GLOBAL FUNCTION
 106
 107         coff_solib_create_inferior_hook -- shared library startup support
 108
 109 SYNOPSIS
 110
 111         void coff_solib_create_inferior_hook()
 112
 113 DESCRIPTION
 114
 115         When gdb starts up the inferior, the kernel maps in the shared
 116         libraries.  We get here with the target stopped at it's first
 117         instruction, and the libraries already mapped.  At this point, this
 118         function gets called via expansion of the macro
 119         SOLIB_CREATE_INFERIOR_HOOK.
 120   */
 121
 122 void
 123 coff_solib_create_inferior_hook()
 124 {
 125   coff_solib_add ((char *) 0, 0, (struct target_ops *) 0);
 126 }