gdb/i386-dicos-tdep.c

   1 /* Target-dependent code for DICOS running on i386's, for GDB.
   2
   3    Copyright (C) 2008 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "osabi.h"
  22 #include "gdb_string.h"
  23 #include "solib.h"
  24 #include "solib-target.h"
  25
  26 static void
  27 i386_dicos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  28 {
  29   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  30
  31   set_solib_ops (gdbarch, &solib_target_so_ops);
  32 }
  33
  34 /* Look in the elf symbol table of ABFD for a symbol named WANTED.
  35    Return true if found.  */
  36 static int
  37 i386_dicos_bfd_has_symbol_p (bfd *abfd, const char *wanted)
  38 {
  39   long storage_needed;
  40   int ret = 0;
  41   asymbol **symbol_table = NULL;
  42
  43   storage_needed = bfd_get_symtab_upper_bound (abfd);
  44   if (storage_needed < 0)
  45     {
  46       warning (_("Can't read elf symbols from %s: %s"), bfd_get_filename (abfd),
  47                bfd_errmsg (bfd_get_error ()));
  48       return 0;
  49     }
  50
  51   if (storage_needed > 0)
  52     {
  53       long i, symcount;
  54
  55       symbol_table = xmalloc (storage_needed);
  56       symcount = bfd_canonicalize_symtab (abfd, symbol_table);
  57
  58       if (symcount < 0)
  59         warning (_("Can't read elf symbols from %s: %s"),
  60                  bfd_get_filename (abfd),
  61                  bfd_errmsg (bfd_get_error ()));
  62       else
  63         {
  64           for (i = 0; i < symcount; i++)
  65             {
  66               asymbol *sym = symbol_table[i];
  67               if (sym->name != NULL
  68                   && wanted[0] == sym->name[0]
  69                   && strcmp (wanted + 1, sym->name + 1) == 0)
  70                 {
  71                   ret = 1;
  72                   break;
  73                 }
  74             }
  75         }
  76     }
  77
  78   xfree (symbol_table);
  79   return ret;
  80 }
  81
  82 static enum gdb_osabi
  83 i386_dicos_osabi_sniffer (bfd *abfd)
  84 {
  85   char *target_name = bfd_get_target (abfd);
  86
  87   /* DICOS debug info files don't have a .note.ABI-tag marker or
  88      something similar.  We do know there's always a "header" section
  89      of 36 bytes, and there's always a "Dicos_loadModuleInfo" symbol
  90      defined.  Look for the section first, as that should be
  91      cheaper.  */
  92   if (strcmp (target_name, "elf32-i386") == 0)
  93     {
  94       asection *section = bfd_get_section_by_name (abfd, "header");
  95       if (section
  96           && bfd_section_size (abfd, section) == 36
  97           && i386_dicos_bfd_has_symbol_p (abfd, "Dicos_loadModuleInfo"))
  98         return GDB_OSABI_DICOS;
  99     }
 100
 101   return GDB_OSABI_UNKNOWN;
 102 }
 103
 104 /* Provide a prototype to silence -Wmissing-prototypes.  */
 105 void _initialize_i386_dicos_tdep (void);
 106
 107 void
 108 _initialize_i386_dicos_tdep (void)
 109 {
 110   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
 111                                   i386_dicos_osabi_sniffer);
 112
 113   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_DICOS,
 114                           i386_dicos_init_abi);
 115 }