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 extern const bfd_target bfd_elf64_alpha_vec;
  36 extern const bfd_target bfd_elf64_alpha_freebsd_vec;
  37
  38
  39 /* Set the start address as in the Tru64 ld.  */
  40 #define ALPHA_TEXT_START_32BIT 0x12000000
  41
  42 static void
  43 alpha_after_open (void)
  44 {
  45   if (link_info.output_bfd->xvec == &bfd_elf64_alpha_vec
  46       || link_info.output_bfd->xvec == &bfd_elf64_alpha_freebsd_vec)
  47     {
  48       unsigned int num_plt;
  49       lang_output_section_statement_type *os;
  50       lang_output_section_statement_type *plt_os[2];
  51
  52       num_plt = 0;
  53       for (os = &lang_output_section_statement.head->output_section_statement;
  54            os != NULL;
  55            os = os->next)
  56         {
  57           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  58             {
  59               if (num_plt < 2)
  60                 plt_os[num_plt] = os;
  61               ++num_plt;
  62             }
  63         }
  64
  65       if (num_plt == 2)
  66         {
  67           plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;
  68           plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;
  69         }
  70     }
  71
  72   gld${EMULATION_NAME}_after_open ();
  73 }
  74
  75 static void
  76 alpha_after_parse (void)
  77 {
  78   if (limit_32bit && !link_info.shared && !link_info.relocatable)
  79     lang_section_start (".interp",
  80                         exp_binop ('+',
  81                                    exp_intop (ALPHA_TEXT_START_32BIT),
  82                                    exp_nameop (SIZEOF_HEADERS, NULL)),
  83                         NULL);
  84 }
  85
  86 static void
  87 alpha_before_allocation (void)
  88 {
  89   /* Call main function; we're just extending it.  */
  90   gld${EMULATION_NAME}_before_allocation ();
  91
  92   /* Add -relax if -O, not -r, and not explicitly disabled.  */
  93   if (link_info.optimize && !link_info.relocatable && !disable_relaxation)
  94     command_line.relax = TRUE;
  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   gld${EMULATION_NAME}_finish ();
 104 }
 105 EOF
 106
 107 # Define some shell vars to insert bits of code into the standard elf
 108 # parse_args and list_options functions.
 109 #
 110 PARSE_AND_LIST_PROLOGUE='
 111 #define OPTION_TASO             300
 112 #define OPTION_NO_RELAX         (OPTION_TASO + 1)
 113 #define OPTION_SECUREPLT        (OPTION_NO_RELAX + 1)
 114 #define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)
 115 '
 116
 117 PARSE_AND_LIST_LONGOPTS='
 118   { "taso", no_argument, NULL, OPTION_TASO },
 119   { "no-relax", no_argument, NULL, OPTION_NO_RELAX },
 120   { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
 121   { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
 122 '
 123
 124 PARSE_AND_LIST_OPTIONS='
 125   fprintf (file, _("\
 126   --taso                      Load executable in the lower 31-bit addressable\n\
 127                                 virtual address range.\n\
 128   --no-relax                  Do not relax call and gp sequences.\n\
 129   --secureplt                 Force PLT in text segment.\n\
 130   --no-secureplt              Force PLT in data segment.\n\
 131 "));
 132 '
 133
 134 PARSE_AND_LIST_ARGS_CASES='
 135     case OPTION_TASO:
 136       limit_32bit = 1;
 137       break;
 138     case OPTION_NO_RELAX:
 139       disable_relaxation = TRUE;
 140       break;
 141     case OPTION_SECUREPLT:
 142       elf64_alpha_use_secureplt = TRUE;
 143       break;
 144     case OPTION_NO_SECUREPLT:
 145       elf64_alpha_use_secureplt = FALSE;
 146       break;
 147 '
 148
 149 # Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
 150 #
 151 LDEMUL_AFTER_OPEN=alpha_after_open
 152 LDEMUL_AFTER_PARSE=alpha_after_parse
 153 LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
 154 LDEMUL_FINISH=alpha_finish