ld/emultempl/ppc32elf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2003, 2005 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 /* Chooses the correct place for .plt and .got.  */
  45 static int old_plt = 0;
  46 static int old_got = 0;
  47
  48 static void
  49 ppc_after_open (void)
  50 {
  51   if (is_ppc_elf32_vec (link_info.hash->creator))
  52     {
  53       int new_plt;
  54       int keep_new;
  55       unsigned int num_plt;
  56       unsigned int num_got;
  57       lang_output_section_statement_type *os;
  58       lang_output_section_statement_type *plt_os[2];
  59       lang_output_section_statement_type *got_os[2];
  60
  61       new_plt = ppc_elf_select_plt_layout (output_bfd, &link_info, old_plt);
  62       if (new_plt < 0)
  63         einfo ("%X%P: select_plt_layout problem %E\n");
  64
  65       num_got = 0;
  66       num_plt = 0;
  67       for (os = &lang_output_section_statement.head->output_section_statement;
  68            os != NULL;
  69            os = os->next)
  70         {
  71           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  72             {
  73               if (num_plt < 2)
  74                 plt_os[num_plt] = os;
  75               ++num_plt;
  76             }
  77           if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
  78             {
  79               if (num_got < 2)
  80                 got_os[num_got] = os;
  81               ++num_got;
  82             }
  83         }
  84
  85       keep_new = new_plt == 1 ? 0 : -1;
  86       if (num_plt == 2)
  87         {
  88           plt_os[0]->constraint = keep_new;
  89           plt_os[1]->constraint = ~keep_new;
  90         }
  91       if (num_got == 2)
  92         {
  93           if (old_got)
  94             keep_new = -1;
  95           got_os[0]->constraint = keep_new;
  96           got_os[1]->constraint = ~keep_new;
  97         }
  98     }
  99
 100   gld${EMULATION_NAME}_after_open ();
 101 }
 102
 103 static void
 104 ppc_before_allocation (void)
 105 {
 106   if (is_ppc_elf32_vec (link_info.hash->creator))
 107     {
 108       if (ppc_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
 109         {
 110           if (!ppc_elf_tls_optimize (output_bfd, &link_info))
 111             {
 112               einfo ("%X%P: TLS problem %E\n");
 113               return;
 114             }
 115         }
 116     }
 117   gld${EMULATION_NAME}_before_allocation ();
 118 }
 119
 120 EOF
 121
 122 # Define some shell vars to insert bits of code into the standard elf
 123 # parse_args and list_options functions.
 124 #
 125 PARSE_AND_LIST_PROLOGUE='
 126 #define OPTION_NO_TLS_OPT               301
 127 #define OPTION_OLD_PLT                  302
 128 #define OPTION_OLD_GOT                  303
 129 '
 130
 131 PARSE_AND_LIST_LONGOPTS='
 132   { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
 133   { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
 134   { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
 135 '
 136
 137 PARSE_AND_LIST_OPTIONS='
 138   fprintf (file, _("\
 139   --no-tls-optimize     Don'\''t try to optimize TLS accesses.\n\
 140   --bss-plt             Force old-style BSS PLT.\n\
 141   --sdata-got           Force GOT location just before .sdata.\n"
 142                    ));
 143 '
 144
 145 PARSE_AND_LIST_ARGS_CASES='
 146     case OPTION_NO_TLS_OPT:
 147       notlsopt = 1;
 148       break;
 149
 150     case OPTION_OLD_PLT:
 151       old_plt = 1;
 152       break;
 153
 154     case OPTION_OLD_GOT:
 155       old_got = 1;
 156       break;
 157 '
 158
 159 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
 160 #
 161 LDEMUL_AFTER_OPEN=ppc_after_open
 162 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation