ld/emultempl/alphaelf.em

   1 # This shell script emits a C file. -*- C -*-
   2 #   Copyright (C) 2003-2023 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 elf.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 bool limit_32bit;
  32
  33 extern bool 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 = (void *) lang_os_list.head;
  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${EMULATION_NAME}_after_open ();
  70 }
  71
  72 static void
  73 alpha_after_parse (void)
  74 {
  75   link_info.relax_pass = 2;
  76   if (limit_32bit
  77       && !bfd_link_pic (&link_info)
  78       && !bfd_link_relocatable (&link_info))
  79     lang_section_start (".interp",
  80                         exp_binop ('+',
  81                                    exp_intop (ALPHA_TEXT_START_32BIT),
  82                                    exp_nameop (SIZEOF_HEADERS, NULL)),
  83                         NULL);
  84
  85   ldelf_after_parse ();
  86 }
  87
  88 static void
  89 alpha_before_allocation (void)
  90 {
  91   /* Call main function; we're just extending it.  */
  92   gld${EMULATION_NAME}_before_allocation ();
  93
  94   /* Add -relax if -O, not -r, and not explicitly disabled.  */
  95   if (link_info.optimize
  96       && !bfd_link_relocatable (&link_info)
  97       && ! RELAXATION_DISABLED_BY_USER)
  98     ENABLE_RELAXATION;
  99 }
 100
 101 static void
 102 alpha_finish (void)
 103 {
 104   if (limit_32bit)
 105     elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT;
 106
 107   finish_default ();
 108 }
 109 EOF
 110
 111 # Define some shell vars to insert bits of code into the standard elf
 112 # parse_args and list_options functions.
 113 #
 114 PARSE_AND_LIST_PROLOGUE='
 115 #define OPTION_TASO             300
 116 #define OPTION_SECUREPLT        (OPTION_TASO + 1)
 117 #define OPTION_NO_SECUREPLT     (OPTION_SECUREPLT + 1)
 118 '
 119
 120 PARSE_AND_LIST_LONGOPTS='
 121   { "taso", no_argument, NULL, OPTION_TASO },
 122   { "secureplt", no_argument, NULL, OPTION_SECUREPLT },
 123   { "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
 124 '
 125
 126 PARSE_AND_LIST_OPTIONS='
 127   fprintf (file, _("\
 128   --taso                      Load executable in the lower 31-bit addressable\n\
 129                                 virtual address range\n"));
 130   fprintf (file, _("\
 131   --secureplt                 Force PLT in text segment\n"));
 132   fprintf (file, _("\
 133   --no-secureplt              Force PLT in data segment\n"));
 134 '
 135
 136 PARSE_AND_LIST_ARGS_CASES='
 137     case OPTION_TASO:
 138       limit_32bit = 1;
 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