154 lines
4.2 KiB
Text
154 lines
4.2 KiB
Text
# This shell script emits a C file. -*- C -*-
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# Copyright 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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#
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# This file is part of the GNU Binutils.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# This file is sourced from elf32.em, and defines extra alpha
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# specific routines.
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#
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cat >>e${EMULATION_NAME}.c <<EOF
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#include "elf/internal.h"
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#include "elf/alpha.h"
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#include "elf-bfd.h"
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static bfd_boolean limit_32bit;
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static bfd_boolean disable_relaxation;
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extern bfd_boolean elf64_alpha_use_secureplt;
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extern const bfd_target bfd_elf64_alpha_vec;
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extern const bfd_target bfd_elf64_alpha_freebsd_vec;
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/* Set the start address as in the Tru64 ld. */
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#define ALPHA_TEXT_START_32BIT 0x12000000
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static void
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alpha_after_open (void)
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{
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if (link_info.hash->creator == &bfd_elf64_alpha_vec
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|| link_info.hash->creator == &bfd_elf64_alpha_freebsd_vec)
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{
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unsigned int num_plt;
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lang_output_section_statement_type *os;
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lang_output_section_statement_type *plt_os[2];
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num_plt = 0;
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for (os = &lang_output_section_statement.head->output_section_statement;
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os != NULL;
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os = os->next)
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{
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if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
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{
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if (num_plt < 2)
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plt_os[num_plt] = os;
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++num_plt;
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}
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}
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if (num_plt == 2)
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{
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plt_os[0]->constraint = elf64_alpha_use_secureplt ? 0 : -1;
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plt_os[1]->constraint = elf64_alpha_use_secureplt ? -1 : 0;
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}
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}
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gld${EMULATION_NAME}_after_open ();
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}
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static void
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alpha_after_parse (void)
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{
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if (limit_32bit && !link_info.shared && !link_info.relocatable)
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lang_section_start (".interp",
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exp_binop ('+',
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exp_intop (ALPHA_TEXT_START_32BIT),
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exp_nameop (SIZEOF_HEADERS, NULL)),
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NULL);
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}
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static void
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alpha_before_allocation (void)
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{
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/* Call main function; we're just extending it. */
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gld${EMULATION_NAME}_before_allocation ();
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/* Add -relax if -O, not -r, and not explicitly disabled. */
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if (link_info.optimize && !link_info.relocatable && !disable_relaxation)
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command_line.relax = TRUE;
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}
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static void
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alpha_finish (void)
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{
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if (limit_32bit)
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elf_elfheader (output_bfd)->e_flags |= EF_ALPHA_32BIT;
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gld${EMULATION_NAME}_finish ();
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}
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EOF
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# Define some shell vars to insert bits of code into the standard elf
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# parse_args and list_options functions.
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#
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PARSE_AND_LIST_PROLOGUE='
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#define OPTION_TASO 300
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#define OPTION_NO_RELAX (OPTION_TASO + 1)
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#define OPTION_SECUREPLT (OPTION_NO_RELAX + 1)
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#define OPTION_NO_SECUREPLT (OPTION_SECUREPLT + 1)
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'
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PARSE_AND_LIST_LONGOPTS='
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{ "taso", no_argument, NULL, OPTION_TASO },
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{ "no-relax", no_argument, NULL, OPTION_NO_RELAX },
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{ "secureplt", no_argument, NULL, OPTION_SECUREPLT },
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{ "no-secureplt", no_argument, NULL, OPTION_NO_SECUREPLT },
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'
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PARSE_AND_LIST_OPTIONS='
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fprintf (file, _("\
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--taso Load executable in the lower 31-bit addressable\n\
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virtual address range.\n\
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--no-relax Do not relax call and gp sequences.\n\
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--secureplt Force PLT in text segment.\n\
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--no-secureplt Force PLT in data segment.\n\
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"));
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'
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PARSE_AND_LIST_ARGS_CASES='
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case OPTION_TASO:
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limit_32bit = 1;
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break;
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case OPTION_NO_RELAX:
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disable_relaxation = TRUE;
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break;
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case OPTION_SECUREPLT:
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elf64_alpha_use_secureplt = TRUE;
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break;
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case OPTION_NO_SECUREPLT:
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elf64_alpha_use_secureplt = FALSE;
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break;
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'
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# Put these extra alpha routines in ld_${EMULATION_NAME}_emulation
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#
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LDEMUL_AFTER_OPEN=alpha_after_open
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LDEMUL_AFTER_PARSE=alpha_after_parse
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LDEMUL_BEFORE_ALLOCATION=alpha_before_allocation
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LDEMUL_FINISH=alpha_finish
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