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|
# This shell script emits a C file. -*- C -*-
# Copyright (C) 2007-2022 Free Software Foundation, Inc.
# Contributed by M R Swami Reddy <MR.Swami.Reddy@nsc.com>
#
# This file is part of the GNU Binutils.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# This file is sourced from elf.em, and defines extra cr16-elf
# specific routines.
#
fragment <<EOF
#include "ldctor.h"
#include "elf32-cr16.h"
static void check_sections (bfd *, asection *, void *);
/* This function is run after all the input files have been opened. */
static void
cr16_elf_after_open (void)
{
/* Call the standard elf routine. */
gld${EMULATION_NAME}_after_open ();
if (command_line.embedded_relocs
&& !bfd_link_relocatable (&link_info))
{
bfd *abfd;
/* In the embedded relocs mode we create a .emreloc section for each
input file with a nonzero .data section. The BFD backend will fill in
these sections with magic numbers which can be used to relocate the
data section at run time. */
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
{
asection *datasec;
/* As first-order business, make sure that each input BFD is either
COFF or ELF. We need to call a special BFD backend function to
generate the embedded relocs, and we have such functions only for
COFF and ELF. */
if (bfd_get_flavour (abfd) != bfd_target_coff_flavour
&& bfd_get_flavour (abfd) != bfd_target_elf_flavour)
einfo (_("%F%P: %pB: all input objects must be COFF or ELF "
"for --embedded-relocs\n"));
datasec = bfd_get_section_by_name (abfd, ".data.rel");
/* Note that we assume that the reloc_count field has already
been set up. We could call bfd_get_reloc_upper_bound, but
that returns the size of a memory buffer rather than a reloc
count. We do not want to call bfd_canonicalize_reloc,
because although it would always work it would force us to
read in the relocs into BFD canonical form, which would waste
a significant amount of time and memory. */
if (datasec != NULL && datasec->reloc_count > 0)
{
asection *relsec;
relsec = bfd_make_section (abfd, ".emreloc");
if (relsec == NULL
|| !bfd_set_section_flags (relsec, (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY))
|| !bfd_set_section_alignment (relsec, 2)
|| !bfd_set_section_size (relsec, datasec->reloc_count * 8))
einfo (_("%F%P: %pB: can not create .emreloc section: %E\n"));
}
/* Double check that all other data sections are empty, as is
required for embedded PIC code. */
bfd_map_over_sections (abfd, check_sections, datasec);
}
}
}
/* Check that of the data sections, only the .data section has
relocs. This is called via bfd_map_over_sections. */
static void
check_sections (bfd *abfd, asection *sec, void *datasec)
{
if ((strncmp (bfd_section_name (sec), ".data.rel", 9) == 0)
&& sec != datasec
&& sec->reloc_count == 0 )
einfo (_("%X%P: %pB: section %s has relocs; can not use --embedded-relocs\n"),
abfd, bfd_section_name (sec));
}
static void
cr16elf_after_parse (void)
{
/* Always behave as if called with --sort-common command line
option.
This is to emulate the CRTools' method of keeping variables
of different alignment in separate sections. */
config.sort_common = true;
/* Don't create a demand-paged executable, since this feature isn't
meaninful in CR16 embedded systems. Moreover, when magic_demand_paged
is true the link sometimes fails. */
config.magic_demand_paged = false;
ldelf_after_parse ();
}
/* This is called after the sections have been attached to output
sections, but before any sizes or addresses have been set. */
static void
cr16elf_before_allocation (void)
{
/* Call the default first. */
gld${EMULATION_NAME}_before_allocation ();
if (command_line.embedded_relocs
&& (!bfd_link_relocatable (&link_info)))
{
bfd *abfd;
/* If we are generating embedded relocs, call a special BFD backend
routine to do the work. */
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
{
asection *datasec, *relsec;
char *errmsg;
datasec = bfd_get_section_by_name (abfd, ".data.rel");
if (datasec == NULL || datasec->reloc_count == 0)
continue;
relsec = bfd_get_section_by_name (abfd, ".emreloc");
ASSERT (relsec != NULL);
if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info,
datasec, relsec,
&errmsg))
{
if (errmsg == NULL)
einfo (_("%X%P: %pB: can not create runtime reloc information: %E\n"),
abfd);
else
einfo (_("%X%P: %pB: can not create runtime reloc information: %s\n"),
abfd, errmsg);
}
}
}
/* Enable relaxation by default if the "--no-relax" option was not
specified. This is done here instead of in the before_parse hook
because there is a check in main() to prohibit use of --relax and
-r together. */
if (RELAXATION_DISABLED_BY_DEFAULT)
ENABLE_RELAXATION;
}
EOF
# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_AFTER_OPEN=cr16_elf_after_open
LDEMUL_AFTER_PARSE=cr16elf_after_parse
LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation
|
