| 1 | # This shell script emits a C file. -*- C -*- |
| 2 | # Copyright (C) 2003-2019 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${EMULATION_NAME}_after_open (); |
| 70 | } |
| 71 | |
| 72 | static void |
| 73 | alpha_after_parse (void) |
| 74 | { |
| 75 | link_info.relax_pass = 2; |
| 76 | if (limit_32bit |
| 77 | && !bfd_link_pic (&link_info) |
| 78 | && !bfd_link_relocatable (&link_info)) |
| 79 | lang_section_start (".interp", |
| 80 | exp_binop ('+', |
| 81 | exp_intop (ALPHA_TEXT_START_32BIT), |
| 82 | exp_nameop (SIZEOF_HEADERS, NULL)), |
| 83 | NULL); |
| 84 | |
| 85 | gld${EMULATION_NAME}_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 |