1# This shell script emits a C file. -*- C -*- 2# Copyright 2003, 2004, 2005, 2007, 2008, 2009 3# Free Software Foundation, Inc. 4# 5# This file is part of the GNU Binutils. 6# 7# This program is free software; you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation; either version 3 of the License, or 10# (at your option) any later version. 11# 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16# 17# You should have received a copy of the GNU General Public License 18# along with this program; if not, write to the Free Software 19# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20# MA 02110-1301, USA. 21# 22 23# This file is sourced from elf32.em, and defines extra alpha 24# specific routines. 25# 26fragment <<EOF 27 28#include "elf/internal.h" 29#include "elf/alpha.h" 30#include "elf-bfd.h" 31 32static bfd_boolean limit_32bit; 33 34extern bfd_boolean elf64_alpha_use_secureplt; 35 36 37/* Set the start address as in the Tru64 ld. */ 38#define ALPHA_TEXT_START_32BIT 0x12000000 39 40static void 41alpha_after_open (void) 42{ 43 if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour 44 && elf_object_id (link_info.output_bfd) == ALPHA_ELF_DATA) 45 { 46 unsigned int num_plt; 47 lang_output_section_statement_type *os; 48 lang_output_section_statement_type *plt_os[2]; 49 50 num_plt = 0; 51 for (os = &lang_output_section_statement.head->output_section_statement; 52 os != NULL; 53 os = os->next) 54 { 55 if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0) 56 { 57 if (num_plt < 2) 58 plt_os[num_plt] = os; 59 ++num_plt; 60 } 61 } 62 63 if (num_plt == 2) 64 { 65 plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1; 66 plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0; 67 } 68 } 69 70 gld${EMULATION_NAME}_after_open (); 71} 72 73static void 74alpha_after_parse (void) 75{ 76 if (limit_32bit && !link_info.shared && !link_info.relocatable) 77 lang_section_start (".interp", 78 exp_binop ('+', 79 exp_intop (ALPHA_TEXT_START_32BIT), 80 exp_nameop (SIZEOF_HEADERS, NULL)), 81 NULL); 82 83 after_parse_default (); 84} 85 86static void 87alpha_before_allocation (void) 88{ 89 /* Call main function; we're just extending it. */ 90 gld${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 97static void 98alpha_finish (void) 99{ 100 if (limit_32bit) 101 elf_elfheader (link_info.output_bfd)->e_flags |= EF_ALPHA_32BIT; 102 103 finish_default (); 104} 105EOF 106 107# Define some shell vars to insert bits of code into the standard elf 108# parse_args and list_options functions. 109# 110PARSE_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 116PARSE_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 122PARSE_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 131PARSE_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# 145LDEMUL_AFTER_OPEN=alpha_after_open 146LDEMUL_AFTER_PARSE=alpha_after_parse 147LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation 148LDEMUL_FINISH=alpha_finish 149