ld/emultempl/alphaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright (C) 2003-2014 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 alpha
  23 # specific routines.
  24 #
  25 fragment <<EOF
  26
  27 #include "elf/internal.h"
  28 #include "elf/alpha.h"
  29 #include "elf-bfd.h"
  30
  31 static bfd_boolean limit_32bit;
  32
  33 extern bfd_boolean elf64_alpha_use_secureplt;
  34
  35
  36 /* Set the start address as in the Tru64 ld.  */
  37 #define ALPHA_TEXT_START_32BIT 0x12000000
  38
  39 static void
  40 alpha_after_open (void)
  41 {
  42   if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
  43       && elf_object_id (link_info.output_bfd) == ALPHA_ELF_DATA)
  44     {
  45       unsigned int num_plt;
  46       lang_output_section_statement_type *os;
  47       lang_output_section_statement_type *plt_os[2];
  48
  49       num_plt = 0;
  50       for (os = &lang_output_section_statement.head->output_section_statement;
  51            os != NULL;
  52            os = os->next)
  53         {
  54           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  55             {
  56               if (num_plt < 2)
  57                 plt_os[num_plt] = os;
  58               ++num_plt;
  59             }
  60         }
  61
  62       if (num_plt == 2)
  63         {
  64           plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;
  65           plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;
  66         }
  67     }
  68
  69   gld${EMULATION_NAME}_after_open ();
  70 }
  71
  72 static void
  73 alpha_after_parse (void)
  74 {
  75   if (limit_32bit && !link_info.shared && !link_info.relocatable)
  76     lang_section_start (".interp",
  77                         exp_binop ('+',
  78                                    exp_intop (ALPHA_TEXT_START_32BIT),
  79                                    exp_nameop (SIZEOF_HEADERS, NULL)),
  80                         NULL);
  81
  82   after_parse_default ();
  83 }
  84
  85 static void
  86 alpha_before_allocation (void)
  87 {
  88   /* Call main function; we're just extending it.  */
  89   gld${EMULATION_NAME}_before_allocation ();
  90
  91   /* Add -relax if -O, not -r, and not explicitly disabled.  */
  92   if (link_info.optimize && !link_info.relocatable && ! RELAXATION_DISABLED_BY_USER)
  93     ENABLE_RELAXATION;
  94 }
  95
  96 static void
  97 alpha_finish (void)
  98 {
  99   if (limit_32bit)
 100     elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT;
 101
 102   finish_default ();
 103 }
 104 EOF
 105
 106 # Define some shell vars to insert bits of code into the standard elf
 107 # parse_args and list_options functions.
 108 #
 109 PARSE_AND_LIST_PROLOGUE='
 110 #define OPTION_TASO             300
 111 #define OPTION_SECUREPLT        (OPTION_TASO + 1)
 112 #define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)
 113 '
 114
 115 PARSE_AND_LIST_LONGOPTS='
 116   { "taso", no_argument, NULL, OPTION_TASO },
 117   { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
 118   { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
 119 '
 120
 121 PARSE_AND_LIST_OPTIONS='
 122   fprintf (file, _("\
 123   --taso                      Load executable in the lower 31-bit addressable\n\
 124                                 virtual address range.\n\
 125   --secureplt                 Force PLT in text segment.\n\
 126   --no-secureplt              Force PLT in data segment.\n\
 127 "));
 128 '
 129
 130 PARSE_AND_LIST_ARGS_CASES='
 131     case OPTION_TASO:
 132       limit_32bit = 1;
 133       break;
 134     case OPTION_SECUREPLT:
 135       elf64_alpha_use_secureplt = TRUE;
 136       break;
 137     case OPTION_NO_SECUREPLT:
 138       elf64_alpha_use_secureplt = FALSE;
 139       break;
 140 '
 141
 142 # Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
 143 #
 144 LDEMUL_AFTER_OPEN=alpha_after_open
 145 LDEMUL_AFTER_PARSE=alpha_after_parse
 146 LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
 147 LDEMUL_FINISH=alpha_finish