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/* Target-dependent, architecture-independent code for DICOS, for GDB.

   Copyright (C) 2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "osabi.h"

#include "gdb_string.h"

#include "solib.h"

#include "solib-target.h"

#include "inferior.h"

#include "dicos-tdep.h"

void

dicos_init_abi (struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  set_solib_ops (gdbarch, &solib_target_so_ops);

  /* Every process, although has its own address space, sees the same

     list of shared libraries.  There's no "main executable" in DICOS,

     so this accounts for all code.  */

  set_gdbarch_has_global_solist (gdbarch, 1);

  /* The DICOS breakpoint API takes care of magically making

     breakpoints visible to all inferiors.  */

  set_gdbarch_has_global_breakpoints (gdbarch, 1);

  /* There's no (standard definition of) entry point or a guaranteed

     text location with a symbol where to place the call dummy, so we

     put it on the stack.  */

  set_gdbarch_call_dummy_location (gdbarch, ON_STACK);

  /* DICOS rewinds the PC itself.  */

  set_gdbarch_decr_pc_after_break (gdbarch, 0);

}

/* Return true if ABFD is a dicos load module.  HEADER_SIZE is the

   expected size of the "header" section in bytes.  */

int

dicos_load_module_p (bfd *abfd, int header_size)

{

  long storage_needed;

  int ret = 0;

  asymbol **symbol_table = NULL;

  const char *symname = "Dicos_loadModuleInfo";

  asection *section;

  /* DICOS files don't have a .note.ABI-tag marker or something

     similar.  We do know there's always a "header" section of

     HEADER_SIZE bytes (size depends on architecture), and there's

     always a "Dicos_loadModuleInfo" symbol defined.  Look for the

     section first, as that should be cheaper.  */

  section = bfd_get_section_by_name (abfd, "header");

  if (!section)

    return 0;

  if (bfd_section_size (abfd, section) != header_size)

    return 0;

  /* Dicos LMs always have a "Dicos_loadModuleInfo" symbol

     defined.  Look for it.  */

  storage_needed = bfd_get_symtab_upper_bound (abfd);

  if (storage_needed < 0)

    {

      warning (_("Can't read elf symbols from %s: %s"), bfd_get_filename (abfd),

               bfd_errmsg (bfd_get_error ()));

      return 0;

    }

  if (storage_needed > 0)

    {

      long i, symcount;

      symbol_table = xmalloc (storage_needed);

      symcount = bfd_canonicalize_symtab (abfd, symbol_table);

      if (symcount < 0)

        warning (_("Can't read elf symbols from %s: %s"),

                 bfd_get_filename (abfd),

                 bfd_errmsg (bfd_get_error ()));

      else

        {

          for (i = 0; i < symcount; i++)

            {

              asymbol *sym = symbol_table[i];

              if (sym->name != NULL

                  && symname[0] == sym->name[0]

                  && strcmp (symname + 1, sym->name + 1) == 0)

                {

                  ret = 1;

                  break;

                }

            }

        }

    }

  xfree (symbol_table);

  return ret;

}