blob: 16e36c501167a989e734672c8069a56c43f2a805 [file] [log] [blame]
# This shell script emits a C file. -*- C -*-
# Copyright (C) 2009-2023 Free Software Foundation, Inc.
# Contributed by Kalray Inc.
#
# 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; see the file COPYING3. If not,
# see <http://www.gnu.org/licenses/>.
#
# This file is sourced from elf32.em, and defines extra kvx-elf
# specific routines.
#
fragment <<EOF
#include "ldctor.h"
#include "elf/kvx.h"
#include "elfxx-kvx.h"
static void
elf${ELFSIZE}_kvx_before_allocation (void)
{
EOF
if test x"${EMULATION_NAME}" != x"elf64kvx_linux"; then
fragment <<EOF
if (bfd_link_pie (&link_info)) {
einfo (_("%F:%P: -pie not supported\n"));
}
EOF
fi
fragment <<EOF
/* Call the standard elf routine. */
gld${EMULATION_NAME}_before_allocation ();
}
/* Fake input file for stubs. */
static lang_input_statement_type *stub_file;
/* Whether we need to call gldarm_layout_sections_again. */
static int need_laying_out = 0;
/* Maximum size of a group of input sections that can be handled by
one stub section. A value of +/-1 indicates the bfd back-end
should use a suitable default size. */
static bfd_signed_vma group_size = -1;
struct hook_stub_info
{
lang_statement_list_type add;
asection *input_section;
};
/* Traverse the linker tree to find the spot where the stub goes. */
static bool
hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
{
lang_statement_union_type *l;
bool ret;
for (; (l = *lp) != NULL; lp = &l->header.next)
{
switch (l->header.type)
{
case lang_constructors_statement_enum:
ret = hook_in_stub (info, &constructor_list.head);
if (ret)
return ret;
break;
case lang_output_section_statement_enum:
ret = hook_in_stub (info,
&l->output_section_statement.children.head);
if (ret)
return ret;
break;
case lang_wild_statement_enum:
ret = hook_in_stub (info, &l->wild_statement.children.head);
if (ret)
return ret;
break;
case lang_group_statement_enum:
ret = hook_in_stub (info, &l->group_statement.children.head);
if (ret)
return ret;
break;
case lang_input_section_enum:
if (l->input_section.section == info->input_section)
{
/* We've found our section. Insert the stub immediately
after its associated input section. */
*(info->add.tail) = l->header.next;
l->header.next = info->add.head;
return true;
}
break;
case lang_data_statement_enum:
case lang_reloc_statement_enum:
case lang_object_symbols_statement_enum:
case lang_output_statement_enum:
case lang_target_statement_enum:
case lang_input_statement_enum:
case lang_assignment_statement_enum:
case lang_padding_statement_enum:
case lang_address_statement_enum:
case lang_fill_statement_enum:
break;
default:
FAIL ();
break;
}
}
return false;
}
/* Call-back for elf${ELFSIZE}_kvx_size_stubs. */
/* Create a new stub section, and arrange for it to be linked
immediately after INPUT_SECTION. */
static asection *
elf${ELFSIZE}_kvx_add_stub_section (const char *stub_sec_name,
asection *input_section)
{
asection *stub_sec;
flagword flags;
asection *output_section;
lang_output_section_statement_type *os;
struct hook_stub_info info;
flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
| SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
stub_sec_name, flags);
if (stub_sec == NULL)
goto err_ret;
bfd_set_section_alignment (stub_sec, 2);
output_section = input_section->output_section;
os = lang_output_section_get (output_section);
info.input_section = input_section;
lang_list_init (&info.add);
lang_add_section (&info.add, stub_sec, NULL, NULL, os);
if (info.add.head == NULL)
goto err_ret;
if (hook_in_stub (&info, &os->children.head))
return stub_sec;
err_ret:
einfo ("%X%P: can not make stub section: %E\n");
return NULL;
}
/* Another call-back for elf${ELFSIZE}_kvx_size_stubs. */
static void
gldkvx_layout_sections_again (void)
{
/* If we have changed sizes of the stub sections, then we need
to recalculate all the section offsets. This may mean we need to
add even more stubs. */
ldelf_map_segments (true);
need_laying_out = -1;
}
static void
build_section_lists (lang_statement_union_type *statement)
{
if (statement->header.type == lang_input_section_enum)
{
asection *i = statement->input_section.section;
if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
&& (i->flags & SEC_EXCLUDE) == 0
&& i->output_section != NULL
&& i->output_section->owner == link_info.output_bfd)
elf${ELFSIZE}_kvx_next_input_section (& link_info, i);
}
}
static void
gld${EMULATION_NAME}_after_allocation (void)
{
int ret;
/* bfd_elf32_discard_info just plays with debugging sections,
ie. doesn't affect any code, so we can delay resizing the
sections. It's likely we'll resize everything in the process of
adding stubs. */
ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
if (ret < 0)
{
einfo ("%X%P: .eh_frame/.stab edit: %E\n");
return;
}
else if (ret > 0)
need_laying_out = 1;
/* If generating a relocatable output file, then we don't
have to examine the relocs. */
if (stub_file != NULL && !bfd_link_relocatable (&link_info))
{
ret = elf${ELFSIZE}_kvx_setup_section_lists (link_info.output_bfd,
&link_info);
if (ret != 0)
{
if (ret < 0)
{
einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
return;
}
lang_for_each_statement (build_section_lists);
/* Call into the BFD backend to do the real work. */
if (! elf${ELFSIZE}_kvx_size_stubs (link_info.output_bfd,
stub_file->the_bfd,
& link_info,
group_size,
& elf${ELFSIZE}_kvx_add_stub_section,
& gldkvx_layout_sections_again))
{
einfo ("%X%P: cannot size stub section: %E\n");
return;
}
}
}
if (need_laying_out != -1)
ldelf_map_segments (need_laying_out);
}
static void
gld${EMULATION_NAME}_finish (void)
{
if (!bfd_link_relocatable (&link_info))
{
/* Now build the linker stubs. */
if (stub_file != NULL
&& stub_file->the_bfd->sections != NULL)
{
if (! elf${ELFSIZE}_kvx_build_stubs (& link_info))
einfo ("%X%P: can not build stubs: %E\n");
}
}
finish_default ();
}
/* This is a convenient point to tell BFD about target specific flags.
After the output has been created, but before inputs are read. */
static void
kvx_elf_create_output_section_statements (void)
{
if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
&& elf_object_id (link_info.output_bfd) == KVX_ELF_DATA))
return;
stub_file = lang_add_input_file ("linker stubs",
lang_input_file_is_fake_enum,
NULL);
stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
if (stub_file->the_bfd == NULL
|| ! bfd_set_arch_mach (stub_file->the_bfd,
bfd_get_arch (link_info.output_bfd),
bfd_get_mach (link_info.output_bfd)))
{
einfo ("%X%P: can not create BFD %E\n");
return;
}
stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
ldlang_add_file (stub_file);
if (!kvx_elf${ELFSIZE}_init_stub_bfd (&link_info, stub_file->the_bfd))
einfo ("%F%P: can not init BFD: %E\n");
}
#define lang_for_each_input_file kvx_lang_for_each_input_file
EOF
LDEMUL_BEFORE_ALLOCATION=elf${ELFSIZE}_kvx_before_allocation
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=kvx_elf_create_output_section_statements
# Call the extra arm-elf function
LDEMUL_FINISH=gld${EMULATION_NAME}_finish