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,
  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
  29 /*
  30
  31    GLOBAL FUNCTION
  32
  33    coff_solib_add -- add a shared library files to the symtab list.  We
  34    examine the `.lib' section of the exec file and determine the names of
  35    the shared libraries.
  36
  37    This function is responsible for discovering those names and
  38    addresses, and saving sufficient information about them to allow
  39    their symbols to be read at a later time.
  40
  41    SYNOPSIS
  42
  43    void coff_solib_add (char *arg_string, int from_tty,
  44    struct target_ops *target)
  45
  46    DESCRIPTION
  47
  48  */
  49
  50 void
  51 coff_solib_add (arg_string, from_tty, target)
  52      char *arg_string;
  53      int from_tty;
  54      struct target_ops *target;
  55 {
  56   asection *libsect;
  57
  58   libsect = bfd_get_section_by_name (exec_bfd, ".lib");
  59
  60   if (libsect)
  61     {
  62       int libsize;
  63       unsigned char *lib;
  64       struct libent
  65         {
  66           bfd_byte len[4];
  67           bfd_byte nameoffset[4];
  68         };
  69
  70       libsize = bfd_section_size (exec_bfd, libsect);
  71
  72       lib = (unsigned char *) alloca (libsize);
  73
  74       bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);
  75
  76       while (libsize > 0)
  77         {
  78           struct libent *ent;
  79           struct objfile *objfile;
  80           int len, nameoffset;
  81           char *filename;
  82
  83           ent = (struct libent *) lib;
  84
  85           len = bfd_get_32 (exec_bfd, ent->len);
  86
  87           nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);
  88
  89           if (len <= 0)
  90             break;
  91
  92           filename = (char *) ent + nameoffset * 4;
  93
  94           objfile = symbol_file_add (filename, from_tty,
  95                                      0,         /* addr */
  96                                      0,         /* not mainline */
  97                                      0,         /* not mapped */
  98                                      0,         /* Not readnow */
  99                                      0,         /* Not user loaded */
 100                                      1);        /* Is a solib */
 101
 102           libsize -= len * 4;
 103           lib += len * 4;
 104         }
 105
 106       /* Getting new symbols may change our opinion about what is
 107          frameless.  */
 108       reinit_frame_cache ();
 109     }
 110 }
 111
 112 /*
 113
 114    GLOBAL FUNCTION
 115
 116    coff_solib_create_inferior_hook -- shared library startup support
 117
 118    SYNOPSIS
 119
 120    void coff_solib_create_inferior_hook()
 121
 122    DESCRIPTION
 123
 124    When gdb starts up the inferior, the kernel maps in the shared
 125    libraries.  We get here with the target stopped at it's first
 126    instruction, and the libraries already mapped.  At this      point, this
 127    function gets called via expansion of the macro
 128    SOLIB_CREATE_INFERIOR_HOOK.
 129  */
 130
 131 void
 132 coff_solib_create_inferior_hook ()
 133 {
 134   coff_solib_add ((char *) 0, 0, (struct target_ops *) 0);
 135 }