Subversion Repositories openrisc_2011-10-31

# This shell script emits a C file. -*- C -*-

#   Copyright 2003, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.

#

# This file is part of the GNU Binutils.

#

# 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, write to the Free Software

# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

# MA 02110-1301, USA.

#

# This file is sourced from elf32.em, and defines extra powerpc32-elf

# specific routines.

#

fragment <

#include "libbfd.h"

#include "elf32-ppc.h"

#define is_ppc_elf(bfd) \

  (bfd_get_flavour (bfd) == bfd_target_elf_flavour \

   && elf_object_id (bfd) == PPC32_ELF_TDATA)

/* Whether to run tls optimization.  */

static int notlsopt = 0;

static int no_tls_get_addr_opt = 0;

/* Whether to emit symbols for stubs.  */

static int emit_stub_syms = -1;

/* Chooses the correct place for .plt and .got.  */

static enum ppc_elf_plt_type plt_style = PLT_UNSET;

static int old_got = 0;

static void

ppc_after_open (void)

{

  if (is_ppc_elf (link_info.output_bfd))

    {

      int new_plt;

      int keep_new;

      unsigned int num_plt;

      unsigned int num_got;

      lang_output_section_statement_type *os;

      lang_output_section_statement_type *plt_os[2];

      lang_output_section_statement_type *got_os[2];

      if (emit_stub_syms < 0)

        emit_stub_syms = link_info.emitrelocations || link_info.shared;

      new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info,

                                           plt_style, emit_stub_syms);

      if (new_plt < 0)

        einfo ("%X%P: select_plt_layout problem %E\n");

      num_got = 0;

      num_plt = 0;

      for (os = &lang_output_section_statement.head->output_section_statement;

           os != NULL;

           os = os->next)

        {

          if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)

            {

              if (num_plt < 2)

                plt_os[num_plt] = os;

              ++num_plt;

            }

          if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)

            {

              if (num_got < 2)

                got_os[num_got] = os;

              ++num_got;

            }

        }

      keep_new = new_plt == 1 ? 0 : -1;

      if (num_plt == 2)

        {

          plt_os[0]->constraint = keep_new;

          plt_os[1]->constraint = ~keep_new;

        }

      if (num_got == 2)

        {

          if (old_got)

            keep_new = -1;

          got_os[0]->constraint = keep_new;

          got_os[1]->constraint = ~keep_new;

        }

    }

  gld${EMULATION_NAME}_after_open ();

}

static void

ppc_before_allocation (void)

{

  if (is_ppc_elf (link_info.output_bfd))

    {

      if (ppc_elf_tls_setup (link_info.output_bfd, &link_info,

                             no_tls_get_addr_opt)

          && !notlsopt)

        {

          if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))

            {

              einfo ("%X%P: TLS problem %E\n");

              return;

            }

        }

    }

  gld${EMULATION_NAME}_before_allocation ();

  /* Turn on relaxation if executable sections have addresses that

     might make branches overflow.  */

  if (!command_line.relax)

    {

      bfd_vma low = (bfd_vma) -1;

      bfd_vma high = 0;

      asection *o;

      /* Run lang_size_sections (if not already done).  */

      if (expld.phase != lang_mark_phase_enum)

        {

          expld.phase = lang_mark_phase_enum;

          expld.dataseg.phase = exp_dataseg_none;

          one_lang_size_sections_pass (NULL, FALSE);

          lang_reset_memory_regions ();

        }

      for (o = link_info.output_bfd->sections; o != NULL; o = o->next)

        {

          if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))

            continue;

          if (o->rawsize == 0)

            continue;

          if (low > o->vma)

            low = o->vma;

          if (high < o->vma + o->rawsize - 1)

            high = o->vma + o->rawsize - 1;

        }

      if (high > low && high - low > (1 << 25) - 1)

        command_line.relax = TRUE;

    }

}

EOF

if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then

  fragment <

/* Special handling for embedded SPU executables.  */

extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);

static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);

static bfd_boolean

ppc_recognized_file (lang_input_statement_type *entry)

{

  if (embedded_spu_file (entry, "-m32"))

    return TRUE;

  return gld${EMULATION_NAME}_load_symbols (entry);

}

EOF

LDEMUL_RECOGNIZED_FILE=ppc_recognized_file

fi

# Define some shell vars to insert bits of code into the standard elf

# parse_args and list_options functions.

#

PARSE_AND_LIST_PROLOGUE='

#define OPTION_NO_TLS_OPT               301

#define OPTION_NO_TLS_GET_ADDR_OPT      (OPTION_NO_TLS_OPT + 1)

#define OPTION_NEW_PLT                  (OPTION_NO_TLS_GET_ADDR_OPT + 1)

#define OPTION_OLD_PLT                  (OPTION_NEW_PLT + 1)

#define OPTION_OLD_GOT                  (OPTION_OLD_PLT + 1)

#define OPTION_STUBSYMS                 (OPTION_OLD_GOT + 1)

#define OPTION_NO_STUBSYMS              (OPTION_STUBSYMS + 1)

'

PARSE_AND_LIST_LONGOPTS='

  { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },

  { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },

  { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },

  { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },

  { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },

  { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },

  { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },

'

PARSE_AND_LIST_OPTIONS='

  fprintf (file, _("\

  --emit-stub-syms            Label linker stubs with a symbol.\n\

  --no-emit-stub-syms         Don'\''t label linker stubs with a symbol.\n\

  --no-tls-optimize           Don'\''t try to optimize TLS accesses.\n\

  --no-tls-get-addr-optimize  Don'\''t use a special __tls_get_addr call.\n\

  --secure-plt                Use new-style PLT if possible.\n\

  --bss-plt                   Force old-style BSS PLT.\n\

  --sdata-got                 Force GOT location just before .sdata.\n"

                   ));

'

PARSE_AND_LIST_ARGS_CASES='

    case OPTION_STUBSYMS:

      emit_stub_syms = 1;

      break;

    case OPTION_NO_STUBSYMS:

      emit_stub_syms = 0;

      break;

    case OPTION_NO_TLS_OPT:

      notlsopt = 1;

      break;

    case OPTION_NO_TLS_GET_ADDR_OPT:

      no_tls_get_addr_opt = 1;

      break;

    case OPTION_NEW_PLT:

      plt_style = PLT_NEW;

      break;

    case OPTION_OLD_PLT:

      plt_style = PLT_OLD;

      break;

    case OPTION_OLD_GOT:

      old_got = 1;

      break;

'

# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation

#

LDEMUL_AFTER_OPEN=ppc_after_open

LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation