ld/emultempl/alphaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright 2003, 2004, 2005 Free Software Foundation, Inc.
   3 #
   4 # This file is part of GLD, the Gnu Linker.
   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 2 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, MA 02110-1301, USA.
  19 #
  20
  21 # This file is sourced from elf32.em, and defines extra alpha
  22 # specific routines.
  23 #
  24 cat >>e${EMULATION_NAME}.c <<EOF
  25
  26 #include "elf/internal.h"
  27 #include "elf/alpha.h"
  28 #include "elf-bfd.h"
  29
  30 static bfd_boolean limit_32bit;
  31 static bfd_boolean disable_relaxation;
  32
  33 extern bfd_boolean elf64_alpha_use_secureplt;
  34 extern const bfd_target bfd_elf64_alpha_vec;
  35 extern const bfd_target bfd_elf64_alpha_freebsd_vec;
  36
  37
  38 /* Set the start address as in the Tru64 ld.  */
  39 #define ALPHA_TEXT_START_32BIT 0x12000000
  40
  41 static void
  42 alpha_after_open (void)
  43 {
  44   if (link_info.hash->creator == &bfd_elf64_alpha_vec
  45       || link_info.hash->creator == &bfd_elf64_alpha_freebsd_vec)
  46     {
  47       unsigned int num_plt;
  48       lang_output_section_statement_type *os;
  49       lang_output_section_statement_type *plt_os[2];
  50
  51       num_plt = 0;
  52       for (os = &lang_output_section_statement.head->output_section_statement;
  53            os != NULL;
  54            os = os->next)
  55         {
  56           if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
  57             {
  58               if (num_plt < 2)
  59                 plt_os[num_plt] = os;
  60               ++num_plt;
  61             }
  62         }
  63
  64       if (num_plt == 2)
  65         {
  66           plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;
  67           plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;
  68         }
  69     }
  70
  71   gld${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
  85 static void
  86 alpha_before_allocation (void)
  87 {
  88   /* Call main function; we're just extending it.  */
  89   gld${EMULATION_NAME}_before_allocation ();
  90
  91   /* Add -relax if -O, not -r, and not explicitly disabled.  */
  92   if (link_info.optimize && !link_info.relocatable && !disable_relaxation)
  93     command_line.relax = TRUE;
  94 }
  95
  96 static void
  97 alpha_finish (void)
  98 {
  99   if (limit_32bit)
 100     elf_elfheader (output_bfd)->e_flags |= EF_ALPHA_32BIT;
 101
 102   gld${EMULATION_NAME}_finish ();
 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_NO_RELAX         (OPTION_TASO + 1)
 112 #define OPTION_SECUREPLT        (OPTION_NO_RELAX + 1)
 113 #define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)
 114 '
 115
 116 PARSE_AND_LIST_LONGOPTS='
 117   { "taso", no_argument, NULL, OPTION_TASO },
 118   { "no-relax", no_argument, NULL, OPTION_NO_RELAX },
 119   { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
 120   { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
 121 '
 122
 123 PARSE_AND_LIST_OPTIONS='
 124   fprintf (file, _("\
 125   --taso                Load executable in the lower 31-bit addressable\n\
 126                         virtual address range.\n\
 127   --no-relax            Do not relax call and gp sequences.\n\
 128   --secureplt           Force PLT in text segment.\n\
 129   --no-secureplt        Force PLT in data segment.\n\
 130 "));
 131 '
 132
 133 PARSE_AND_LIST_ARGS_CASES='
 134     case OPTION_TASO:
 135       limit_32bit = 1;
 136       break;
 137     case OPTION_NO_RELAX:
 138       disable_relaxation = TRUE;
 139       break;
 140     case OPTION_SECUREPLT:
 141       elf64_alpha_use_secureplt = TRUE;
 142       break;
 143     case OPTION_NO_SECUREPLT:
 144       elf64_alpha_use_secureplt = FALSE;
 145       break;
 146 '
 147
 148 # Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
 149 #
 150 LDEMUL_AFTER_OPEN=alpha_after_open
 151 LDEMUL_AFTER_PARSE=alpha_after_parse
 152 LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
 153 LDEMUL_FINISH=alpha_finish