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, int readsyms)
  47
  48    DESCRIPTION
  49
  50  */
  51
  52 void
  53 coff_solib_add (char *arg_string, int from_tty, struct target_ops *target, int readsyms)
  54 {
  55   asection *libsect;
  56
  57   if (!readsyms)
  58     return;
  59
  60   libsect = bfd_get_section_by_name (exec_bfd, ".lib");
  61
  62   if (libsect)
  63     {
  64       int libsize;
  65       unsigned char *lib;
  66       struct libent
  67         {
  68           bfd_byte len[4];
  69           bfd_byte nameoffset[4];
  70         };
  71
  72       libsize = bfd_section_size (exec_bfd, libsect);
  73
  74       lib = (unsigned char *) alloca (libsize);
  75
  76       bfd_get_section_contents (exec_bfd, libsect, lib, 0, libsize);
  77
  78       while (libsize > 0)
  79         {
  80           struct libent *ent;
  81           struct objfile *objfile;
  82           int len, nameoffset;
  83           char *filename;
  84
  85           ent = (struct libent *) lib;
  86
  87           len = bfd_get_32 (exec_bfd, ent->len);
  88
  89           nameoffset = bfd_get_32 (exec_bfd, ent->nameoffset);
  90
  91           if (len <= 0)
  92             break;
  93
  94           filename = (char *) ent + nameoffset * 4;
  95
  96           objfile = symbol_file_add (filename, from_tty,
  97                                      NULL,      /* no offsets */
  98                                      0,         /* not mainline */
  99                                      OBJF_SHARED);      /* flags */
 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 (void)
 132 {
 133   coff_solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
 134 }