ld/emultempl/alphaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2003, 2004, 2005, 2007, 2008 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 static bfd_boolean disable_relaxation;
  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_TDATA)
  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${EMULATION_NAME}_after_open ();
  71 }
  72
  73 static void
  74 alpha_after_parse (void)
  75 {
  76   if (limit_32bit && !link_info.shared && !link_info.relocatable)
  77     lang_section_start (".interp",
  78                         exp_binop ('+',
  79                                    exp_intop (ALPHA_TEXT_START_32BIT),
  80                                    exp_nameop (SIZEOF_HEADERS, NULL)),
  81                         NULL);
  82 }
  83
  84 static void
  85 alpha_before_allocation (void)
  86 {
  87   /* Call main function; we're just extending it.  */
  88   gld${EMULATION_NAME}_before_allocation ();
  89
  90   /* Add -relax if -O, not -r, and not explicitly disabled.  */
  91   if (link_info.optimize && !link_info.relocatable && !disable_relaxation)
  92     command_line.relax = TRUE;
  93 }
  94
  95 static void
  96 alpha_finish (void)
  97 {
  98   if (limit_32bit)
  99     elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT;
 100
 101   gld${EMULATION_NAME}_finish ();
 102 }
 103 EOF
 104
 105 # Define some shell vars to insert bits of code into the standard elf
 106 # parse_args and list_options functions.
 107 #
 108 PARSE_AND_LIST_PROLOGUE='
 109 #define OPTION_TASO             300
 110 #define OPTION_NO_RELAX         (OPTION_TASO + 1)
 111 #define OPTION_SECUREPLT        (OPTION_NO_RELAX + 1)
 112 #define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)
 113 '
 114
 115 PARSE_AND_LIST_LONGOPTS='
 116   { "taso", no_argument, NULL, OPTION_TASO },
 117   { "no-relax", no_argument, NULL, OPTION_NO_RELAX },
 118   { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
 119   { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
 120 '
 121
 122 PARSE_AND_LIST_OPTIONS='
 123   fprintf (file, _("\
 124   --taso                      Load executable in the lower 31-bit addressable\n\
 125                                 virtual address range.\n\
 126   --no-relax                  Do not relax call and gp sequences.\n\
 127   --secureplt                 Force PLT in text segment.\n\
 128   --no-secureplt              Force PLT in data segment.\n\
 129 "));
 130 '
 131
 132 PARSE_AND_LIST_ARGS_CASES='
 133     case OPTION_TASO:
 134       limit_32bit = 1;
 135       break;
 136     case OPTION_NO_RELAX:
 137       disable_relaxation = TRUE;
 138       break;
 139     case OPTION_SECUREPLT:
 140       elf64_alpha_use_secureplt = TRUE;
 141       break;
 142     case OPTION_NO_SECUREPLT:
 143       elf64_alpha_use_secureplt = FALSE;
 144       break;
 145 '
 146
 147 # Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
 148 #
 149 LDEMUL_AFTER_OPEN=alpha_after_open
 150 LDEMUL_AFTER_PARSE=alpha_after_parse
 151 LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
 152 LDEMUL_FINISH=alpha_finish