Subversion Repositories openrisc_2011-10-31

/* Target-dependent code for HP PA-RISC BSD's.

   Copyright (C) 2004, 2005, 2006, 2007, 2008, 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 "objfiles.h"

#include "target.h"

#include "value.h"

#include "elf/common.h"

#include "hppa-tdep.h"

#include "hppabsd-tdep.h"

#include "solib-svr4.h"

static CORE_ADDR

hppabsd_find_global_pointer (struct gdbarch *gdbarch, struct value *function)

{

  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

  CORE_ADDR faddr = value_as_address (function);

  struct obj_section *faddr_sec;

  gdb_byte buf[4];

  /* Is this a plabel? If so, dereference it to get the Global Pointer

     value.  */

  if (faddr & 2)

    {

      if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0)

        return extract_unsigned_integer (buf, sizeof buf, byte_order);

    }

  /* If the address is in the .plt section, then the real function

     hasn't yet been fixed up by the linker so we cannot determine the

     Global Pointer for that function.  */

  if (in_plt_section (faddr, NULL))

    return 0;

  faddr_sec = find_pc_section (faddr);

  if (faddr_sec != NULL)

    {

      struct obj_section *sec;

      ALL_OBJFILE_OSECTIONS (faddr_sec->objfile, sec)

        {

          if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0)

            break;

        }

      if (sec < faddr_sec->objfile->sections_end)

        {

          CORE_ADDR addr = obj_section_addr (sec);

          CORE_ADDR endaddr = obj_section_endaddr (sec);

          while (addr < endaddr)

            {

              gdb_byte buf[4];

              LONGEST tag;

              if (target_read_memory (addr, buf, sizeof buf) != 0)

                break;

              tag = extract_signed_integer (buf, sizeof buf, byte_order);

              if (tag == DT_PLTGOT)

                {

                  CORE_ADDR pltgot;

                  if (target_read_memory (addr + 4, buf, sizeof buf) != 0)

                    break;

                  /* The NetBSD/OpenBSD ld.so doesn't relocate DT_PLTGOT, so

                     we have to do it ourselves.  */

                  pltgot = extract_unsigned_integer (buf, sizeof buf,

                                                     byte_order);

                  pltgot += ANOFFSET (sec->objfile->section_offsets,

                                      SECT_OFF_TEXT (sec->objfile));

                  return pltgot;

                }

              if (tag == DT_NULL)

                break;

              addr += 8;

            }

        }

    }

  return 0;

}

void

hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)

{

  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  /* OpenBSD and NetBSD have a 64-bit 'long double'.  */

  set_gdbarch_long_double_bit (gdbarch, 64);

  set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);

  /* OpenBSD and NetBSD use ELF.  */

  tdep->is_elf = 1;

  tdep->find_global_pointer = hppabsd_find_global_pointer;

  tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline;

  set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);

  /* OpenBSD and NetBSD use SVR4-style shared libraries.  */

  set_solib_svr4_fetch_link_map_offsets

    (gdbarch, svr4_ilp32_fetch_link_map_offsets);

}