gdb/coff-solib.c

   1 /* Handle COFF SVR3 shared libraries for GDB, the GNU Debugger.
   2    Copyright (C) 1993, 1994, 1998, 1999, 2000, 2007
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22
  23 #include "defs.h"
  24
  25 #include "frame.h"
  26 #include "bfd.h"
  27 #include "gdbcore.h"
  28 #include "symtab.h"
  29 #include "symfile.h"
  30 #include "objfiles.h"
  31
  32 /*
  33
  34    GLOBAL FUNCTION
  35
  36    coff_solib_add -- add a shared library files to the symtab list.  We
  37    examine the `.lib' section of the exec file and determine the names of
  38    the shared libraries.
  39
  40    This function is responsible for discovering those names and
  41    addresses, and saving sufficient information about them to allow
  42    their symbols to be read at a later time.
  43
  44    SYNOPSIS
  45
  46    void coff_solib_add (char *arg_string, int from_tty,
  47    struct target_ops *target, int readsyms)
  48
  49    DESCRIPTION
  50
  51  */
  52
  53 void
  54 coff_solib_add (char *arg_string, int from_tty, struct target_ops *target, int readsyms)
  55 {
  56   asection *libsect;
  57
  58   if (!readsyms)
  59     return;
  60
  61   libsect = bfd_get_section_by_name (exec_bfd, ".lib");
  62
  63   if (libsect)
  64     {
  65       int libsize;
  66       unsigned char *lib;
  67       struct libent
  68         {
  69           bfd_byte len[4];
  70           bfd_byte nameoffset[4];
  71         };
  72
  73       libsize = bfd_section_size (exec_bfd, libsect);
  74
  75       lib = (unsigned char *) alloca (libsize);
  76
  77       bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);
  78
  79       while (libsize > 0)
  80         {
  81           struct libent *ent;
  82           struct objfile *objfile;
  83           int len, nameoffset;
  84           char *filename;
  85
  86           ent = (struct libent *) lib;
  87
  88           len = bfd_get_32 (exec_bfd, ent->len);
  89
  90           nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);
  91
  92           if (len <= 0)
  93             break;
  94
  95           filename = (char *) ent + nameoffset * 4;
  96
  97           objfile = symbol_file_add (filename, from_tty,
  98                                      NULL,      /* no offsets */
  99                                      0,         /* not mainline */
 100                                      OBJF_SHARED);      /* flags */
 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 (void)
 133 {
 134   coff_solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
 135 }