ld/emultempl/ppc32elf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2003, 2005, 2007 Free Software Foundation, Inc.
   3 #
   4 # This file is part of the GNU Binutils.
   5 #
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19 # MA 02110-1301, USA.
  20 #
  21
  22 # This file is sourced from elf32.em, and defines extra powerpc32-elf
  23 # specific routines.
  24 #
  25 fragment <<EOF
  26
  27 #include "libbfd.h"
  28 #include "elf32-ppc.h"
  29
  30 extern const bfd_target bfd_elf32_powerpc_vec;
  31 extern const bfd_target bfd_elf32_powerpcle_vec;
  32 extern const bfd_target bfd_elf32_powerpc_vxworks_vec;
  33
  34 static inline int
  35 is_ppc_elf32_vec(const bfd_target * vec)
  36 {
  37   return (vec == &bfd_elf32_powerpc_vec
  38           || vec == &bfd_elf32_powerpc_vxworks_vec
  39           || vec == &bfd_elf32_powerpcle_vec);
  40 }
  41
  42 /* Whether to run tls optimization.  */
  43 static int notlsopt = 0;
  44
  45 /* Whether to emit symbols for stubs.  */
  46 static int emit_stub_syms = 0;
  47
  48 /* Chooses the correct place for .plt and .got.  */
  49 static enum ppc_elf_plt_type plt_style = PLT_UNSET;
  50 static int old_got = 0;
  51
  52 static void
  53 ppc_after_open (void)
  54 {
  55   if (is_ppc_elf32_vec (link_info.hash->creator))
  56     {
  57       int new_plt;
  58       int keep_new;
  59       unsigned int num_plt;
  60       unsigned int num_got;
  61       lang_output_section_statement_type *os;
  62       lang_output_section_statement_type *plt_os[2];
  63       lang_output_section_statement_type *got_os[2];
  64
  65       emit_stub_syms |= link_info.emitrelocations;
  66       new_plt = ppc_elf_select_plt_layout (output_bfd, &link_info, plt_style,
  67                                            emit_stub_syms);
  68       if (new_plt < 0)
  69         einfo ("%X%P: select_plt_layout problem %E\n");
  70
  71       num_got = 0;
  72       num_plt = 0;
  73       for (os = &lang_output_section_statement.head->output_section_statement;
  74            os != NULL;
  75            os = os->next)
  76         {
  77           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  78             {
  79               if (num_plt < 2)
  80                 plt_os[num_plt] = os;
  81               ++num_plt;
  82             }
  83           if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
  84             {
  85               if (num_got < 2)
  86                 got_os[num_got] = os;
  87               ++num_got;
  88             }
  89         }
  90
  91       keep_new = new_plt == 1 ? 0 : -1;
  92       if (num_plt == 2)
  93         {
  94           plt_os[0]->constraint = keep_new;
  95           plt_os[1]->constraint = ~keep_new;
  96         }
  97       if (num_got == 2)
  98         {
  99           if (old_got)
 100             keep_new = -1;
 101           got_os[0]->constraint = keep_new;
 102           got_os[1]->constraint = ~keep_new;
 103         }
 104     }
 105
 106   gld${EMULATION_NAME}_after_open ();
 107 }
 108
 109 static void
 110 ppc_before_allocation (void)
 111 {
 112   if (is_ppc_elf32_vec (link_info.hash->creator))
 113     {
 114       if (ppc_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
 115         {
 116           if (!ppc_elf_tls_optimize (output_bfd, &link_info))
 117             {
 118               einfo ("%X%P: TLS problem %E\n");
 119               return;
 120             }
 121         }
 122     }
 123   gld${EMULATION_NAME}_before_allocation ();
 124 }
 125
 126 EOF
 127
 128 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
 129   fragment <<EOF
 130 /* Special handling for embedded SPU executables.  */
 131 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
 132 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
 133
 134 static bfd_boolean
 135 ppc_recognized_file (lang_input_statement_type *entry)
 136 {
 137   if (embedded_spu_file (entry, "-m32"))
 138     return TRUE;
 139
 140   return gld${EMULATION_NAME}_load_symbols (entry);
 141 }
 142
 143 EOF
 144 LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
 145 fi
 146
 147 # Define some shell vars to insert bits of code into the standard elf
 148 # parse_args and list_options functions.
 149 #
 150 PARSE_AND_LIST_PROLOGUE='
 151 #define OPTION_NO_TLS_OPT               301
 152 #define OPTION_NEW_PLT                  302
 153 #define OPTION_OLD_PLT                  303
 154 #define OPTION_OLD_GOT                  304
 155 #define OPTION_STUBSYMS                 305
 156 '
 157
 158 PARSE_AND_LIST_LONGOPTS='
 159   { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
 160   { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
 161   { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
 162   { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
 163   { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
 164 '
 165
 166 PARSE_AND_LIST_OPTIONS='
 167   fprintf (file, _("\
 168   --emit-stub-syms            Label linker stubs with a symbol.\n\
 169   --no-tls-optimize           Don'\''t try to optimize TLS accesses.\n\
 170   --secure-plt                Use new-style PLT if possible.\n\
 171   --bss-plt                   Force old-style BSS PLT.\n\
 172   --sdata-got                 Force GOT location just before .sdata.\n"
 173                    ));
 174 '
 175
 176 PARSE_AND_LIST_ARGS_CASES='
 177     case OPTION_STUBSYMS:
 178       emit_stub_syms = 1;
 179       break;
 180
 181     case OPTION_NO_TLS_OPT:
 182       notlsopt = 1;
 183       break;
 184
 185     case OPTION_NEW_PLT:
 186       plt_style = PLT_NEW;
 187       break;
 188
 189     case OPTION_OLD_PLT:
 190       plt_style = PLT_OLD;
 191       break;
 192
 193     case OPTION_OLD_GOT:
 194       old_got = 1;
 195       break;
 196 '
 197
 198 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
 199 #
 200 LDEMUL_AFTER_OPEN=ppc_after_open
 201 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation