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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [ld/] [emultempl/] [mipself.em] - Blame information for rev 146

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1 145 khays
# This shell script emits a C file. -*- C -*-
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#   Copyright 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
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#
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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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21
fragment <
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23
#include "ldctor.h"
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#include "elf/mips.h"
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#include "elfxx-mips.h"
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27
#define is_mips_elf(bfd)                                \
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  (bfd_get_flavour (bfd) == bfd_target_elf_flavour      \
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   && elf_tdata (bfd) != NULL                           \
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   && elf_object_id (bfd) == MIPS_ELF_DATA)
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/* Fake input file for stubs.  */
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static lang_input_statement_type *stub_file;
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static bfd *stub_bfd;
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static void
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mips_after_parse (void)
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{
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  /* .gnu.hash and the MIPS ABI require .dynsym to be sorted in different
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     ways.  .gnu.hash needs symbols to be grouped by hash code whereas the
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     MIPS ABI requires a mapping between the GOT and the symbol table.  */
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  if (link_info.emit_gnu_hash)
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    {
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      einfo ("%X%P: .gnu.hash is incompatible with the MIPS ABI\n");
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      link_info.emit_hash = TRUE;
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      link_info.emit_gnu_hash = FALSE;
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    }
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  after_parse_default ();
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}
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struct hook_stub_info
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{
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  lang_statement_list_type add;
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  asection *input_section;
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};
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/* Traverse the linker tree to find the spot where the stub goes.  */
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static bfd_boolean
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hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
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{
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  lang_statement_union_type *l;
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  bfd_boolean ret;
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  for (; (l = *lp) != NULL; lp = &l->header.next)
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    {
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      switch (l->header.type)
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        {
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        case lang_constructors_statement_enum:
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          ret = hook_in_stub (info, &constructor_list.head);
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          if (ret)
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            return ret;
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          break;
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        case lang_output_section_statement_enum:
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          ret = hook_in_stub (info,
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                              &l->output_section_statement.children.head);
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          if (ret)
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            return ret;
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          break;
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        case lang_wild_statement_enum:
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          ret = hook_in_stub (info, &l->wild_statement.children.head);
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          if (ret)
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            return ret;
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          break;
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        case lang_group_statement_enum:
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          ret = hook_in_stub (info, &l->group_statement.children.head);
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          if (ret)
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            return ret;
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          break;
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        case lang_input_section_enum:
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          if (info->input_section == NULL
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              || l->input_section.section == info->input_section)
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            {
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              /* We've found our section.  Insert the stub immediately
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                 before its associated input section.  */
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              *lp = info->add.head;
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              *(info->add.tail) = l;
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              return TRUE;
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            }
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          break;
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        case lang_data_statement_enum:
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        case lang_reloc_statement_enum:
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        case lang_object_symbols_statement_enum:
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        case lang_output_statement_enum:
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        case lang_target_statement_enum:
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        case lang_input_statement_enum:
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        case lang_assignment_statement_enum:
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        case lang_padding_statement_enum:
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        case lang_address_statement_enum:
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        case lang_fill_statement_enum:
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          break;
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        default:
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          FAIL ();
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          break;
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        }
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    }
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  return FALSE;
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}
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/* Create a new stub section called STUB_SEC_NAME and arrange for it to
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   be linked in OUTPUT_SECTION.  The section should go at the beginning of
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   OUTPUT_SECTION if INPUT_SECTION is null, otherwise it must go immediately
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   before INPUT_SECTION.  */
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static asection *
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mips_add_stub_section (const char *stub_sec_name, asection *input_section,
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                       asection *output_section)
134
{
135
  asection *stub_sec;
136
  flagword flags;
137
  const char *secname;
138
  lang_output_section_statement_type *os;
139
  struct hook_stub_info info;
140
 
141
  /* Create the stub file, if we haven't already.  */
142
  if (stub_file == NULL)
143
    {
144
      stub_file = lang_add_input_file ("linker stubs",
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                                       lang_input_file_is_fake_enum,
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                                       NULL);
147
      stub_bfd = bfd_create ("linker stubs", link_info.output_bfd);
148
      if (stub_bfd == NULL
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          || !bfd_set_arch_mach (stub_bfd,
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                                 bfd_get_arch (link_info.output_bfd),
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                                 bfd_get_mach (link_info.output_bfd)))
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        {
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          einfo ("%F%P: can not create BFD %E\n");
154
          return NULL;
155
        }
156
      stub_bfd->flags |= BFD_LINKER_CREATED;
157
      stub_file->the_bfd = stub_bfd;
158
      ldlang_add_file (stub_file);
159
    }
160
 
161
  /* Create the section.  */
162
  stub_sec = bfd_make_section_anyway (stub_bfd, stub_sec_name);
163
  if (stub_sec == NULL)
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    goto err_ret;
165
 
166
  /* Set the flags.  */
167
  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
168
           | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_KEEP);
169
  if (!bfd_set_section_flags (stub_bfd, stub_sec, flags))
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    goto err_ret;
171
 
172
  /* Create an output section statement.  */
173
  secname = bfd_get_section_name (output_section->owner, output_section);
174
  os = lang_output_section_find (secname);
175
 
176
  /* Initialize a statement list that contains only the new statement.  */
177
  lang_list_init (&info.add);
178
  lang_add_section (&info.add, stub_sec, os);
179
  if (info.add.head == NULL)
180
    goto err_ret;
181
 
182
  /* Insert the new statement in the appropriate place.  */
183
  info.input_section = input_section;
184
  if (hook_in_stub (&info, &os->children.head))
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    return stub_sec;
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187
 err_ret:
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  einfo ("%X%P: can not make stub section: %E\n");
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  return NULL;
190
}
191
 
192
/* This is called before the input files are opened.  */
193
 
194
static void
195
mips_create_output_section_statements (void)
196
{
197
  if (is_mips_elf (link_info.output_bfd))
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    _bfd_mips_elf_init_stubs (&link_info, mips_add_stub_section);
199
}
200
 
201
/* This is called after we have merged the private data of the input bfds.  */
202
 
203
static void
204
mips_before_allocation (void)
205
{
206
  flagword flags;
207
 
208
  flags = elf_elfheader (link_info.output_bfd)->e_flags;
209
  if (!link_info.shared
210
      && !link_info.nocopyreloc
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      && (flags & (EF_MIPS_PIC | EF_MIPS_CPIC)) == EF_MIPS_CPIC)
212
    _bfd_mips_elf_use_plts_and_copy_relocs (&link_info);
213
 
214
  gld${EMULATION_NAME}_before_allocation ();
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}
216
 
217
/* Avoid processing the fake stub_file in vercheck, stat_needed and
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   check_needed routines.  */
219
 
220
static void (*real_func) (lang_input_statement_type *);
221
 
222
static void mips_for_each_input_file_wrapper (lang_input_statement_type *l)
223
{
224
  if (l != stub_file)
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    (*real_func) (l);
226
}
227
 
228
static void
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mips_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
230
{
231
  real_func = func;
232
  lang_for_each_input_file (&mips_for_each_input_file_wrapper);
233
}
234
 
235
#define lang_for_each_input_file mips_lang_for_each_input_file
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237
EOF
238
 
239
LDEMUL_AFTER_PARSE=mips_after_parse
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LDEMUL_BEFORE_ALLOCATION=mips_before_allocation
241
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=mips_create_output_section_statements

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