gdb/coff-solib.c

   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)
  47
  48    DESCRIPTION
  49
  50  */
  51
  52 void
  53 coff_solib_add (char *arg_string, int from_tty, 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                                      NULL,      /* no offsets */
  95                                      0,         /* not mainline */
  96                                      OBJF_SHARED);      /* flags */
  97
  98           libsize -= len * 4;
  99           lib += len * 4;
 100         }
 101
 102       /* Getting new symbols may change our opinion about what is
 103          frameless.  */
 104       reinit_frame_cache ();
 105     }
 106 }
 107
 108 /*
 109
 110    GLOBAL FUNCTION
 111
 112    coff_solib_create_inferior_hook -- shared library startup support
 113
 114    SYNOPSIS
 115
 116    void coff_solib_create_inferior_hook()
 117
 118    DESCRIPTION
 119
 120    When gdb starts up the inferior, the kernel maps in the shared
 121    libraries.  We get here with the target stopped at it's first
 122    instruction, and the libraries already mapped.  At this      point, this
 123    function gets called via expansion of the macro
 124    SOLIB_CREATE_INFERIOR_HOOK.
 125  */
 126
 127 void
 128 coff_solib_create_inferior_hook (void)
 129 {
 130   coff_solib_add ((char *) 0, 0, (struct target_ops *) 0);
 131 }