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 static bfd_boolean disable_relaxation;
  34
  35 extern bfd_boolean elf64_alpha_use_secureplt;
  36
  37
  38 /* Set the start address as in the Tru64 ld.  */
  39 #define ALPHA_TEXT_START_32BIT 0x12000000
  40
  41 static void
  42 alpha_after_open (void)
  43 {
  44   if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
  45       && elf_object_id (link_info.output_bfd) == ALPHA_ELF_TDATA)
  46     {
  47       unsigned int num_plt;
  48       lang_output_section_statement_type *os;
  49       lang_output_section_statement_type *plt_os[2];
  50
  51       num_plt = 0;
  52       for (os = &lang_output_section_statement.head->output_section_statement;
  53            os != NULL;
  54            os = os->next)
  55         {
  56           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  57             {
  58               if (num_plt < 2)
  59                 plt_os[num_plt] = os;
  60               ++num_plt;
  61             }
  62         }
  63
  64       if (num_plt == 2)
  65         {
  66           plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;
  67           plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;
  68         }
  69     }
  70
  71   gld${EMULATION_NAME}_after_open ();
  72 }
  73
  74 static void
  75 alpha_after_parse (void)
  76 {
  77   if (limit_32bit && !link_info.shared && !link_info.relocatable)
  78     lang_section_start (".interp",
  79                         exp_binop ('+',
  80                                    exp_intop (ALPHA_TEXT_START_32BIT),
  81                                    exp_nameop (SIZEOF_HEADERS, NULL)),
  82                         NULL);
  83
  84   after_parse_default ();
  85 }
  86
  87 static void
  88 alpha_before_allocation (void)
  89 {
  90   /* Call main function; we're just extending it.  */
  91   gld${EMULATION_NAME}_before_allocation ();
  92
  93   /* Add -relax if -O, not -r, and not explicitly disabled.  */
  94   if (link_info.optimize && !link_info.relocatable && !disable_relaxation)
  95     command_line.relax = TRUE;
  96 }
  97
  98 static void
  99 alpha_finish (void)
 100 {
 101   if (limit_32bit)
 102     elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT;
 103
 104   finish_default ();
 105 }
 106 EOF
 107
 108 # Define some shell vars to insert bits of code into the standard elf
 109 # parse_args and list_options functions.
 110 #
 111 PARSE_AND_LIST_PROLOGUE='
 112 #define OPTION_TASO             300
 113 #define OPTION_NO_RELAX         (OPTION_TASO + 1)
 114 #define OPTION_SECUREPLT        (OPTION_NO_RELAX + 1)
 115 #define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)
 116 '
 117
 118 PARSE_AND_LIST_LONGOPTS='
 119   { "taso", no_argument, NULL, OPTION_TASO },
 120   { "no-relax", no_argument, NULL, OPTION_NO_RELAX },
 121   { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
 122   { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
 123 '
 124
 125 PARSE_AND_LIST_OPTIONS='
 126   fprintf (file, _("\
 127   --taso                      Load executable in the lower 31-bit addressable\n\
 128                                 virtual address range.\n\
 129   --no-relax                  Do not relax call and gp sequences.\n\
 130   --secureplt                 Force PLT in text segment.\n\
 131   --no-secureplt              Force PLT in data segment.\n\
 132 "));
 133 '
 134
 135 PARSE_AND_LIST_ARGS_CASES='
 136     case OPTION_TASO:
 137       limit_32bit = 1;
 138       break;
 139     case OPTION_NO_RELAX:
 140       disable_relaxation = TRUE;
 141       break;
 142     case OPTION_SECUREPLT:
 143       elf64_alpha_use_secureplt = TRUE;
 144       break;
 145     case OPTION_NO_SECUREPLT:
 146       elf64_alpha_use_secureplt = FALSE;
 147       break;
 148 '
 149
 150 # Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
 151 #
 152 LDEMUL_AFTER_OPEN=alpha_after_open
 153 LDEMUL_AFTER_PARSE=alpha_after_parse
 154 LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
 155 LDEMUL_FINISH=alpha_finish