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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [ld/] [emultempl/] [ppc32elf.em] - Blame information for rev 299

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1 145 khays
# This shell script emits a C file. -*- C -*-
2 157 khays
#   Copyright 2003, 2005, 2007, 2008, 2009, 2010, 2011
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#   Free Software Foundation, Inc.
4 145 khays
#
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# This file is part of the GNU Binutils.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# This file is sourced from elf32.em, and defines extra powerpc32-elf
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# specific routines.
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#
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fragment <
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28
#include "libbfd.h"
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#include "elf32-ppc.h"
30
 
31
#define is_ppc_elf(bfd) \
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  (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
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   && elf_object_id (bfd) == PPC32_ELF_DATA)
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/* Whether to run tls optimization.  */
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static int notlsopt = 0;
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static int no_tls_get_addr_opt = 0;
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39
/* Whether to emit symbols for stubs.  */
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static int emit_stub_syms = -1;
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42
/* Chooses the correct place for .plt and .got.  */
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static enum ppc_elf_plt_type plt_style = PLT_UNSET;
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static int old_got = 0;
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46
static void
47
ppc_after_open (void)
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{
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  if (is_ppc_elf (link_info.output_bfd))
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    {
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      int new_plt;
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      int keep_new;
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      unsigned int num_plt;
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      unsigned int num_got;
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      lang_output_section_statement_type *os;
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      lang_output_section_statement_type *plt_os[2];
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      lang_output_section_statement_type *got_os[2];
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      if (emit_stub_syms < 0)
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        emit_stub_syms = link_info.emitrelocations || link_info.shared;
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      new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info,
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                                           plt_style, emit_stub_syms);
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      if (new_plt < 0)
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        einfo ("%X%P: select_plt_layout problem %E\n");
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66
      num_got = 0;
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      num_plt = 0;
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      for (os = &lang_output_section_statement.head->output_section_statement;
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           os != NULL;
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           os = os->next)
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        {
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          if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
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            {
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              if (num_plt < 2)
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                plt_os[num_plt] = os;
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              ++num_plt;
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            }
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          if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
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            {
80
              if (num_got < 2)
81
                got_os[num_got] = os;
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              ++num_got;
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            }
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        }
85
 
86
      keep_new = new_plt == 1 ? 0 : -1;
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      if (num_plt == 2)
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        {
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          plt_os[0]->constraint = keep_new;
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          plt_os[1]->constraint = ~keep_new;
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        }
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      if (num_got == 2)
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        {
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          if (old_got)
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            keep_new = -1;
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          got_os[0]->constraint = keep_new;
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          got_os[1]->constraint = ~keep_new;
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        }
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    }
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  gld${EMULATION_NAME}_after_open ();
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}
103
 
104
static void
105
ppc_before_allocation (void)
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{
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  if (is_ppc_elf (link_info.output_bfd))
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    {
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      if (ppc_elf_tls_setup (link_info.output_bfd, &link_info,
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                             no_tls_get_addr_opt)
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          && !notlsopt)
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        {
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          if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
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            {
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              einfo ("%X%P: TLS problem %E\n");
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              return;
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            }
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        }
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    }
120
 
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  gld${EMULATION_NAME}_before_allocation ();
122
 
123
  /* Turn on relaxation if executable sections have addresses that
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     might make branches overflow.  */
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  if (RELAXATION_DISABLED_BY_DEFAULT)
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    {
127
      bfd_vma low = (bfd_vma) -1;
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      bfd_vma high = 0;
129
      asection *o;
130
 
131
      /* Run lang_size_sections (if not already done).  */
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      if (expld.phase != lang_mark_phase_enum)
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        {
134
          expld.phase = lang_mark_phase_enum;
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          expld.dataseg.phase = exp_dataseg_none;
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          one_lang_size_sections_pass (NULL, FALSE);
137
          lang_reset_memory_regions ();
138
        }
139
 
140
      for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
141
        {
142
          if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
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            continue;
144
          if (o->rawsize == 0)
145
            continue;
146
          if (low > o->vma)
147
            low = o->vma;
148
          if (high < o->vma + o->rawsize - 1)
149
            high = o->vma + o->rawsize - 1;
150
        }
151
      if (high > low && high - low > (1 << 25) - 1)
152
        ENABLE_RELAXATION;
153
    }
154
}
155
 
156
EOF
157
 
158
if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
159
  fragment <
160
/* Special handling for embedded SPU executables.  */
161
extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
162
static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
163
 
164
static bfd_boolean
165
ppc_recognized_file (lang_input_statement_type *entry)
166
{
167
  if (embedded_spu_file (entry, "-m32"))
168
    return TRUE;
169
 
170
  return gld${EMULATION_NAME}_load_symbols (entry);
171
}
172
 
173
EOF
174
LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
175
fi
176
 
177
# Define some shell vars to insert bits of code into the standard elf
178
# parse_args and list_options functions.
179
#
180 157 khays
PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
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#define OPTION_NO_TLS_OPT               321
182 145 khays
#define OPTION_NO_TLS_GET_ADDR_OPT      (OPTION_NO_TLS_OPT + 1)
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#define OPTION_NEW_PLT                  (OPTION_NO_TLS_GET_ADDR_OPT + 1)
184
#define OPTION_OLD_PLT                  (OPTION_NEW_PLT + 1)
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#define OPTION_OLD_GOT                  (OPTION_OLD_PLT + 1)
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#define OPTION_STUBSYMS                 (OPTION_OLD_GOT + 1)
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#define OPTION_NO_STUBSYMS              (OPTION_STUBSYMS + 1)
188
'
189
 
190 157 khays
PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
191 145 khays
  { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
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  { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
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  { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
194
  { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },
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  { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
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  { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
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  { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
198
'
199
 
200 157 khays
PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
201 145 khays
  fprintf (file, _("\
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  --emit-stub-syms            Label linker stubs with a symbol.\n\
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  --no-emit-stub-syms         Don'\''t label linker stubs with a symbol.\n\
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  --no-tls-optimize           Don'\''t try to optimize TLS accesses.\n\
205
  --no-tls-get-addr-optimize  Don'\''t use a special __tls_get_addr call.\n\
206
  --secure-plt                Use new-style PLT if possible.\n\
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  --bss-plt                   Force old-style BSS PLT.\n\
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  --sdata-got                 Force GOT location just before .sdata.\n"
209
                   ));
210
'
211
 
212 157 khays
PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
213 145 khays
    case OPTION_STUBSYMS:
214
      emit_stub_syms = 1;
215
      break;
216
 
217
    case OPTION_NO_STUBSYMS:
218
      emit_stub_syms = 0;
219
      break;
220
 
221
    case OPTION_NO_TLS_OPT:
222
      notlsopt = 1;
223
      break;
224
 
225
    case OPTION_NO_TLS_GET_ADDR_OPT:
226
      no_tls_get_addr_opt = 1;
227
      break;
228
 
229
    case OPTION_NEW_PLT:
230
      plt_style = PLT_NEW;
231
      break;
232
 
233
    case OPTION_OLD_PLT:
234
      plt_style = PLT_OLD;
235
      break;
236
 
237
    case OPTION_OLD_GOT:
238
      old_got = 1;
239
      break;
240
'
241
 
242
# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
243
#
244
LDEMUL_AFTER_OPEN=ppc_after_open
245
LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation

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