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      1 # This shell script emits a C file. -*- C -*-
      2 #   Copyright (C) 2003-2014 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 
     33 extern bfd_boolean 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 = &lang_output_section_statement.head->output_section_statement;
     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${EMULATION_NAME}_after_open ();
     70 }
     71 
     72 static void
     73 alpha_after_parse (void)
     74 {
     75   link_info.relax_pass = 2;
     76   if (limit_32bit && !link_info.shared && !link_info.relocatable)
     77     lang_section_start (".interp",
     78 			exp_binop ('+',
     79 				   exp_intop (ALPHA_TEXT_START_32BIT),
     80 				   exp_nameop (SIZEOF_HEADERS, NULL)),
     81 			NULL);
     82 
     83   after_parse_default ();
     84 }
     85 
     86 static void
     87 alpha_before_allocation (void)
     88 {
     89   /* Call main function; we're just extending it.  */
     90   gld${EMULATION_NAME}_before_allocation ();
     91 
     92   /* Add -relax if -O, not -r, and not explicitly disabled.  */
     93   if (link_info.optimize && !link_info.relocatable && ! RELAXATION_DISABLED_BY_USER)
     94     ENABLE_RELAXATION;
     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   finish_default ();
    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_SECUREPLT	(OPTION_TASO + 1)
    113 #define OPTION_NO_SECUREPLT	(OPTION_SECUREPLT + 1)
    114 '
    115 
    116 PARSE_AND_LIST_LONGOPTS='
    117   { "taso", no_argument, NULL, OPTION_TASO },
    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   --secureplt                 Force PLT in text segment.\n\
    127   --no-secureplt              Force PLT in data segment.\n\
    128 "));
    129 '
    130 
    131 PARSE_AND_LIST_ARGS_CASES='
    132     case OPTION_TASO:
    133       limit_32bit = 1;
    134       break;
    135     case OPTION_SECUREPLT:
    136       elf64_alpha_use_secureplt = TRUE;
    137       break;
    138     case OPTION_NO_SECUREPLT:
    139       elf64_alpha_use_secureplt = FALSE;
    140       break;
    141 '
    142 
    143 # Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
    144 #
    145 LDEMUL_AFTER_OPEN=alpha_after_open
    146 LDEMUL_AFTER_PARSE=alpha_after_parse
    147 LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
    148 LDEMUL_FINISH=alpha_finish
    149