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 GLD, the Gnu Linker.
   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 2 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, MA 02110-1301, USA.
  19 #
  20
  21 # This file is sourced from elf32.em, and defines extra powerpc32-elf
  22 # specific routines.
  23 #
  24 cat >>e${EMULATION_NAME}.c <<EOF
  25
  26 #include "libbfd.h"
  27 #include "elf32-ppc.h"
  28
  29 extern const bfd_target bfd_elf32_powerpc_vec;
  30 extern const bfd_target bfd_elf32_powerpcle_vec;
  31 extern const bfd_target bfd_elf32_powerpc_vxworks_vec;
  32
  33 static inline int
  34 is_ppc_elf32_vec(const bfd_target * vec)
  35 {
  36   return (vec == &bfd_elf32_powerpc_vec
  37           || vec == &bfd_elf32_powerpc_vxworks_vec
  38           || vec == &bfd_elf32_powerpcle_vec);
  39 }
  40
  41 /* Whether to run tls optimization.  */
  42 static int notlsopt = 0;
  43
  44 /* Whether to emit symbols for stubs.  */
  45 static int emit_stub_syms = 0;
  46
  47 /* Chooses the correct place for .plt and .got.  */
  48 static enum ppc_elf_plt_type plt_style = PLT_UNSET;
  49 static int old_got = 0;
  50
  51 static void
  52 ppc_after_open (void)
  53 {
  54   if (is_ppc_elf32_vec (link_info.hash->creator))
  55     {
  56       int new_plt;
  57       int keep_new;
  58       unsigned int num_plt;
  59       unsigned int num_got;
  60       lang_output_section_statement_type *os;
  61       lang_output_section_statement_type *plt_os[2];
  62       lang_output_section_statement_type *got_os[2];
  63
  64       emit_stub_syms |= link_info.emitrelocations;
  65       new_plt = ppc_elf_select_plt_layout (output_bfd, &link_info, plt_style,
  66                                            emit_stub_syms);
  67       if (new_plt < 0)
  68         einfo ("%X%P: select_plt_layout problem %E\n");
  69
  70       num_got = 0;
  71       num_plt = 0;
  72       for (os = &lang_output_section_statement.head->output_section_statement;
  73            os != NULL;
  74            os = os->next)
  75         {
  76           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  77             {
  78               if (num_plt < 2)
  79                 plt_os[num_plt] = os;
  80               ++num_plt;
  81             }
  82           if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
  83             {
  84               if (num_got < 2)
  85                 got_os[num_got] = os;
  86               ++num_got;
  87             }
  88         }
  89
  90       keep_new = new_plt == 1 ? 0 : -1;
  91       if (num_plt == 2)
  92         {
  93           plt_os[0]->constraint = keep_new;
  94           plt_os[1]->constraint = ~keep_new;
  95         }
  96       if (num_got == 2)
  97         {
  98           if (old_got)
  99             keep_new = -1;
 100           got_os[0]->constraint = keep_new;
 101           got_os[1]->constraint = ~keep_new;
 102         }
 103     }
 104
 105   gld${EMULATION_NAME}_after_open ();
 106 }
 107
 108 static void
 109 ppc_before_allocation (void)
 110 {
 111   if (is_ppc_elf32_vec (link_info.hash->creator))
 112     {
 113       if (ppc_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
 114         {
 115           if (!ppc_elf_tls_optimize (output_bfd, &link_info))
 116             {
 117               einfo ("%X%P: TLS problem %E\n");
 118               return;
 119             }
 120         }
 121     }
 122   gld${EMULATION_NAME}_before_allocation ();
 123 }
 124
 125 EOF
 126
 127 if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
 128   cat >>e${EMULATION_NAME}.c <<EOF
 129 /* Special handling for embedded SPU executables.  */
 130 extern bfd_boolean embedded_spu_file (lang_input_statement_type *, const char *);
 131 static bfd_boolean gld${EMULATION_NAME}_load_symbols (lang_input_statement_type *);
 132
 133 static bfd_boolean
 134 ppc_recognized_file (lang_input_statement_type *entry)
 135 {
 136   if (embedded_spu_file (entry, "-m32"))
 137     return TRUE;
 138
 139   return gld${EMULATION_NAME}_load_symbols (entry);
 140 }
 141
 142 EOF
 143 LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
 144 fi
 145
 146 # Define some shell vars to insert bits of code into the standard elf
 147 # parse_args and list_options functions.
 148 #
 149 PARSE_AND_LIST_PROLOGUE='
 150 #define OPTION_NO_TLS_OPT               301
 151 #define OPTION_NEW_PLT                  302
 152 #define OPTION_OLD_PLT                  303
 153 #define OPTION_OLD_GOT                  304
 154 #define OPTION_STUBSYMS                 305
 155 '
 156
 157 PARSE_AND_LIST_LONGOPTS='
 158   { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
 159   { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
 160   { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
 161   { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
 162   { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
 163 '
 164
 165 PARSE_AND_LIST_OPTIONS='
 166   fprintf (file, _("\
 167   --emit-stub-syms      Label linker stubs with a symbol.\n\
 168   --no-tls-optimize     Don'\''t try to optimize TLS accesses.\n\
 169   --secure-plt          Use new-style PLT if possible.\n\
 170   --bss-plt             Force old-style BSS PLT.\n\
 171   --sdata-got           Force GOT location just before .sdata.\n"
 172                    ));
 173 '
 174
 175 PARSE_AND_LIST_ARGS_CASES='
 176     case OPTION_STUBSYMS:
 177       emit_stub_syms = 1;
 178       break;
 179
 180     case OPTION_NO_TLS_OPT:
 181       notlsopt = 1;
 182       break;
 183
 184     case OPTION_NEW_PLT:
 185       plt_style = PLT_NEW;
 186       break;
 187
 188     case OPTION_OLD_PLT:
 189       plt_style = PLT_OLD;
 190       break;
 191
 192     case OPTION_OLD_GOT:
 193       old_got = 1;
 194       break;
 195 '
 196
 197 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
 198 #
 199 LDEMUL_AFTER_OPEN=ppc_after_open
 200 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation