184 lines
5.9 KiB
Plaintext
184 lines
5.9 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# Copyright (C) 2007-2015 Free Software Foundation, Inc.
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# Contributed by M R Swami Reddy <MR.Swami.Reddy@nsc.com>
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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 cr16-elf
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# specific routines.
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#
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fragment <<EOF
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#include "ldctor.h"
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static void check_sections (bfd *, asection *, void *);
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/* This function is run after all the input files have been opened. */
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static void
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cr16_elf_after_open (void)
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{
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/* Call the standard elf routine. */
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gld${EMULATION_NAME}_after_open ();
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if (command_line.embedded_relocs
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&& !bfd_link_relocatable (&link_info))
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{
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bfd *abfd;
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/* In the embedded relocs mode we create a .emreloc section for each
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input file with a nonzero .data section. The BFD backend will fill in
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these sections with magic numbers which can be used to relocate the
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data section at run time. */
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for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
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{
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asection *datasec;
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/* As first-order business, make sure that each input BFD is either
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COFF or ELF. We need to call a special BFD backend function to
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generate the embedded relocs, and we have such functions only for
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COFF and ELF. */
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if (bfd_get_flavour (abfd) != bfd_target_coff_flavour
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&& bfd_get_flavour (abfd) != bfd_target_elf_flavour)
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einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n");
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datasec = bfd_get_section_by_name (abfd, ".data.rel");
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/* Note that we assume that the reloc_count field has already
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been set up. We could call bfd_get_reloc_upper_bound, but
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that returns the size of a memory buffer rather than a reloc
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count. We do not want to call bfd_canonicalize_reloc,
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because although it would always work it would force us to
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read in the relocs into BFD canonical form, which would waste
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a significant amount of time and memory. */
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if (datasec != NULL && datasec->reloc_count > 0)
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{
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asection *relsec;
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relsec = bfd_make_section (abfd, ".emreloc");
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if (relsec == NULL
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|| ! bfd_set_section_flags (abfd, relsec,
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(SEC_ALLOC
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| SEC_LOAD
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| SEC_HAS_CONTENTS
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| SEC_IN_MEMORY))
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|| ! bfd_set_section_alignment (abfd, relsec, 2)
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|| ! bfd_set_section_size (abfd, relsec,
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datasec->reloc_count * 8))
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einfo ("%F%B: can not create .emreloc section: %E\n");
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}
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/* Double check that all other data sections are empty, as is
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required for embedded PIC code. */
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bfd_map_over_sections (abfd, check_sections, datasec);
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}
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}
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}
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/* Check that of the data sections, only the .data section has
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relocs. This is called via bfd_map_over_sections. */
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static void
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check_sections (bfd *abfd, asection *sec, void *datasec)
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{
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if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0)
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&& sec != datasec
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&& sec->reloc_count == 0 )
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einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
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abfd, bfd_get_section_name (abfd, sec));
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}
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static void
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cr16elf_after_parse (void)
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{
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/* Always behave as if called with --sort-common command line
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option.
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This is to emulate the CRTools' method of keeping variables
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of different alignment in separate sections. */
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config.sort_common = TRUE;
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/* Don't create a demand-paged executable, since this feature isn't
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meaninful in CR16 embedded systems. Moreover, when magic_demand_paged
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is true the link sometimes fails. */
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config.magic_demand_paged = FALSE;
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gld${EMULATION_NAME}_after_parse ();
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}
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/* This is called after the sections have been attached to output
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sections, but before any sizes or addresses have been set. */
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static void
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cr16elf_before_allocation (void)
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{
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/* Call the default first. */
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gld${EMULATION_NAME}_before_allocation ();
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if (command_line.embedded_relocs
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&& (!bfd_link_relocatable (&link_info)))
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{
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bfd *abfd;
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/* If we are generating embedded relocs, call a special BFD backend
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routine to do the work. */
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for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
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{
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asection *datasec, *relsec;
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char *errmsg;
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datasec = bfd_get_section_by_name (abfd, ".data.rel");
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if (datasec == NULL || datasec->reloc_count == 0)
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continue;
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relsec = bfd_get_section_by_name (abfd, ".emreloc");
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ASSERT (relsec != NULL);
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if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info,
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datasec, relsec,
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&errmsg))
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{
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if (errmsg == NULL)
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einfo ("%B%X: can not create runtime reloc information: %E\n",
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abfd);
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else
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einfo ("%X%B: can not create runtime reloc information: %s\n",
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abfd, errmsg);
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}
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}
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}
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/* Enable relaxation by default if the "--no-relax" option was not
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specified. This is done here instead of in the before_parse hook
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because there is a check in main() to prohibit use of --relax and
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-r together. */
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if (RELAXATION_DISABLED_BY_DEFAULT)
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ENABLE_RELAXATION;
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}
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EOF
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# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation
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#
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LDEMUL_AFTER_OPEN=cr16_elf_after_open
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LDEMUL_AFTER_PARSE=cr16elf_after_parse
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LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation
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