ld/emultempl/alphaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2003, 2004, 2005, 2007, 2008, 2009
   3 #   Free Software Foundation, Inc.
   4 #
   5 # This file is part of the GNU Binutils.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program; if not, write to the Free Software
  19 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20 # MA 02110-1301, USA.
  21 #
  22
  23 # This file is sourced from elf32.em, and defines extra alpha
  24 # specific routines.
  25 #
  26 fragment <<EOF
  27
  28 #include "elf/internal.h"
  29 #include "elf/alpha.h"
  30 #include "elf-bfd.h"
  31
  32 static bfd_boolean limit_32bit;
  33
  34 extern bfd_boolean elf64_alpha_use_secureplt;
  35
  36
  37 /* Set the start address as in the Tru64 ld.  */
  38 #define ALPHA_TEXT_START_32BIT 0x12000000
  39
  40 static void
  41 alpha_after_open (void)
  42 {
  43   if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
  44       && elf_object_id (link_info.output_bfd) == ALPHA_ELF_DATA)
  45     {
  46       unsigned int num_plt;
  47       lang_output_section_statement_type *os;
  48       lang_output_section_statement_type *plt_os[2];
  49
  50       num_plt = 0;
  51       for (os = &lang_output_section_statement.head->output_section_statement;
  52            os != NULL;
  53            os = os->next)
  54         {
  55           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  56             {
  57               if (num_plt < 2)
  58                 plt_os[num_plt] = os;
  59               ++num_plt;
  60             }
  61         }
  62
  63       if (num_plt == 2)
  64         {
  65           plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;
  66           plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;
  67         }
  68     }
  69
  70   gld${EMULATION_NAME}_after_open ();
  71 }
  72
  73 static void
  74 alpha_after_parse (void)
  75 {
  76   if (limit_32bit && !link_info.shared && !link_info.relocatable)
  77     lang_section_start (".interp",
  78                         exp_binop ('+',
  79                                    exp_intop (ALPHA_TEXT_START_32BIT),
  80                                    exp_nameop (SIZEOF_HEADERS, NULL)),
  81                         NULL);
  82
  83   after_parse_default ();
  84 }
  85
  86 static void
  87 alpha_before_allocation (void)
  88 {
  89   /* Call main function; we're just extending it.  */
  90   gld${EMULATION_NAME}_before_allocation ();
  91
  92   /* Add -relax if -O, not -r, and not explicitly disabled.  */
  93   if (link_info.optimize && !link_info.relocatable && ! RELAXATION_DISABLED_BY_USER)
  94     ENABLE_RELAXATION;
  95 }
  96
  97 static void
  98 alpha_finish (void)
  99 {
 100   if (limit_32bit)
 101     elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT;
 102
 103   finish_default ();
 104 }
 105 EOF
 106
 107 # Define some shell vars to insert bits of code into the standard elf
 108 # parse_args and list_options functions.
 109 #
 110 PARSE_AND_LIST_PROLOGUE='
 111 #define OPTION_TASO             300
 112 #define OPTION_SECUREPLT        (OPTION_TASO + 1)
 113 #define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)
 114 '
 115
 116 PARSE_AND_LIST_LONGOPTS='
 117   { "taso", no_argument, NULL, OPTION_TASO },
 118   { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
 119   { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
 120 '
 121
 122 PARSE_AND_LIST_OPTIONS='
 123   fprintf (file, _("\
 124   --taso                      Load executable in the lower 31-bit addressable\n\
 125                                 virtual address range.\n\
 126   --secureplt                 Force PLT in text segment.\n\
 127   --no-secureplt              Force PLT in data segment.\n\
 128 "));
 129 '
 130
 131 PARSE_AND_LIST_ARGS_CASES='
 132     case OPTION_TASO:
 133       limit_32bit = 1;
 134       break;
 135     case OPTION_SECUREPLT:
 136       elf64_alpha_use_secureplt = TRUE;
 137       break;
 138     case OPTION_NO_SECUREPLT:
 139       elf64_alpha_use_secureplt = FALSE;
 140       break;
 141 '
 142
 143 # Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
 144 #
 145 LDEMUL_AFTER_OPEN=alpha_after_open
 146 LDEMUL_AFTER_PARSE=alpha_after_parse
 147 LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
 148 LDEMUL_FINISH=alpha_finish