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|
# This shell script emits a C file. -*- C -*-
# Copyright 2023 Free Software Foundation, Inc.
#
# This file is part of GLD, the Gnu Linker.
#
# 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 2 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 Neutrino
# specific routines.
# NTO templates aims to refine the default ${ARCH}elf.em template.
. "${srcdir}/emultempl/${ARCH}elf.em"
cat >>e${EMULATION_NAME}.c <<EOF
#include "elf/internal.h"
#include "elf/common.h"
#include "elf-bfd.h"
#include "../bfd/libbfd.h"
bool nto_lazy_stack = false;
struct nto_stack_note
{
unsigned char stacksize[4];
unsigned char stackalloc[4];
unsigned char execstack[4];
};
/* Generate the QNT_STACK .note section. */
static void
nto_add_note_section (void) {
asection *note_sec;
flagword flags;
Elf_External_Note *e_note;
bfd_size_type size, h_size;
struct nto_stack_note *n_note;
/* Don't create a note if the stack size isn't provided. */
if (link_info.stacksize <= 0)
return;
/* As ${ARCH}elf.em is imported and ${ARCH}_elf_create_output_section_statements
is called before this function, stub_file should already be defined. */
if (!stub_file)
{
einfo (_("%F%P: cannot create .note section in stub BFD.\n"));
return;
}
if (nto_lazy_stack && !link_info.stacksize)
{
einfo (_("%F%P: error: --lazy-stack must follow -zstack-size=<size>\n"));
return;
}
flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_HAS_CONTENTS
| SEC_IN_MEMORY | SEC_LINKER_CREATED);
note_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd, ".note", flags);
if (! note_sec)
{
einfo (_("%F%P: failed to create .note section\n"));
return;
}
size = offsetof (Elf_External_Note, name[sizeof "QNX"]);
size = (size + 3) & -(bfd_size_type) 4;
h_size = size;
size += sizeof (struct nto_stack_note);
note_sec->size = size;
elf_section_type (note_sec) = SHT_NOTE;
note_sec->contents = xmalloc (note_sec->size);
e_note = (Elf_External_Note *) note_sec->contents;
bfd_h_put_32 (stub_file->the_bfd, sizeof "QNX", &e_note->namesz);
bfd_h_put_32 (stub_file->the_bfd, sizeof (struct nto_stack_note), &e_note->descsz);
bfd_h_put_32 (stub_file->the_bfd, QNT_STACK, &e_note->type);
memcpy (e_note->name, "QNX", sizeof "QNX");
/* Generate .note content.*/
n_note = (struct nto_stack_note *) (note_sec->contents + h_size);
bfd_h_put_32 (stub_file->the_bfd, link_info.stacksize, &n_note->stacksize);
if (nto_lazy_stack)
bfd_h_put_32 (stub_file->the_bfd, 4096, &n_note->stackalloc);
else
bfd_h_put_32 (stub_file->the_bfd, link_info.stacksize, &n_note->stackalloc);
if (link_info.execstack != link_info.noexecstack && link_info.execstack)
bfd_h_put_32 (stub_file->the_bfd, 0, &n_note->execstack);
else
bfd_h_put_32 (stub_file->the_bfd, 1, &n_note->execstack);
}
static void
nto_create_output_section_statements (void)
{
${ARCH}_elf_create_output_section_statements ();
nto_add_note_section();
}
EOF
# Define some shell vars to insert bits of code into the standard elf
# parse_args and list_options functions.
#
PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
enum nto_options
{
OPTION_STACK = 500,
OPTION_LAZY_STACK,
};
'
PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
{ "stack", required_argument, NULL, OPTION_STACK },
{ "lazy-stack", no_argument, NULL, OPTION_LAZY_STACK },
'
PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
fprintf (file, _("\
--stack <size> Set size of the initial stack\n\
--lazy-stack Set lazy allocation of stack\n\
"));
'
PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
case OPTION_STACK:
{
char *end;
link_info.stacksize = strtoul (optarg, &end, 0);
if (*end || link_info.stacksize < 0)
einfo (_("%F%P: invalid stack size `%s'\''\n"), optarg + 11);
if (!link_info.stacksize)
/* Use -1 for explicit no-stack, because zero means
'default'. */
link_info.stacksize = -1;
break;
}
case OPTION_LAZY_STACK:
nto_lazy_stack = true;
break;
'
# Put these extra Neutrino routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=nto_create_output_section_statements
|
