binutils-gdb/ld/emultempl/ppc64elf.em

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# This shell script emits a C file. -*- C -*-
# Copyright 2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# This file is sourced from elf32.em, and defines extra powerpc64-elf
# specific routines.
#
cat >>e${EMULATION_NAME}.c <<EOF
#include "ldctor.h"
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#include "libbfd.h"
#include "elf64-ppc.h"
/* Fake input file for stubs. */
static lang_input_statement_type *stub_file;
/* Whether we need to call ppc_layout_sections_again. */
static int need_laying_out = 0;
/* Maximum size of a group of input sections that can be handled by
one stub section. A value of +/-1 indicates the bfd back-end
should use a suitable default size. */
static bfd_signed_vma group_size = 1;
static void ppc_create_output_section_statements PARAMS ((void));
static asection *ppc_add_stub_section PARAMS ((const char *, asection *));
static void ppc_layout_sections_again PARAMS ((void));
static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
static void build_section_lists PARAMS ((lang_statement_union_type *));
/* This is called before the input files are opened. We create a new
fake input file to hold the stub sections. */
static void
ppc_create_output_section_statements ()
{
stub_file = lang_add_input_file ("linker stubs",
lang_input_file_is_fake_enum,
NULL);
stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
if (stub_file->the_bfd == NULL
|| !bfd_set_arch_mach (stub_file->the_bfd,
bfd_get_arch (output_bfd),
bfd_get_mach (output_bfd)))
{
einfo ("%X%P: can not create BFD %E\n");
return;
}
ldlang_add_file (stub_file);
}
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 boolean hook_in_stub
PARAMS ((struct hook_stub_info *, lang_statement_union_type **));
static boolean
hook_in_stub (info, lp)
struct hook_stub_info *info;
lang_statement_union_type **lp;
{
lang_statement_union_type *l;
boolean 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
before its associated input section. */
*lp = info->add.head;
*(info->add.tail) = l;
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 ppc64_elf_size_stubs. */
/* Create a new stub section, and arrange for it to be linked
immediately before INPUT_SECTION. */
static asection *
ppc_add_stub_section (stub_sec_name, input_section)
const char *stub_sec_name;
asection *input_section;
{
asection *stub_sec;
flagword flags;
asection *output_section;
const char *secname;
lang_output_section_statement_type *os;
struct hook_stub_info info;
stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
if (stub_sec == NULL)
goto err_ret;
flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
| SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
goto err_ret;
output_section = input_section->output_section;
secname = bfd_get_section_name (output_section->owner, output_section);
os = lang_output_section_find (secname);
info.input_section = input_section;
lang_list_init (&info.add);
lang_add_section (&info.add, stub_sec, os, stub_file);
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 ppc64_elf_size_stubs. */
static void
ppc_layout_sections_again ()
{
/* 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. */
need_laying_out = 0;
lang_reset_memory_regions ();
/* Resize the sections. */
lang_size_sections (stat_ptr->head, abs_output_section,
&stat_ptr->head, 0, (bfd_vma) 0, NULL);
/* Recalculate TOC base. */
ldemul_after_allocation ();
/* Do the assignments again. */
lang_do_assignments (stat_ptr->head, abs_output_section,
(fill_type *) 0, (bfd_vma) 0);
}
/* Call the back-end function to set TOC base after we have placed all
the sections. */
static void
gld${EMULATION_NAME}_after_allocation ()
{
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if (!link_info.relocateable)
_bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
}
static void
build_section_lists (statement)
lang_statement_union_type *statement;
{
if (statement->header.type == lang_input_section_enum
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&& !statement->input_section.ifile->just_syms_flag
&& statement->input_section.section->output_section != NULL
&& statement->input_section.section->output_section->owner == output_bfd)
{
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ppc64_elf_next_input_section (&link_info,
statement->input_section.section);
}
}
/* Final emulation specific call. */
static void
gld${EMULATION_NAME}_finish ()
{
int ret;
/* e_entry on PowerPC64 points to the function descriptor for
_start. If _start is missing, default to the first function
descriptor in the .opd section. */
entry_section = ".opd";
/* If generating a relocatable output file, then we don't have any
stubs. */
if (link_info.relocateable)
return;
/* bfd_elf64_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. */
if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
need_laying_out = 1;
ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
if (ret != 0)
{
if (ret < 0)
{
einfo ("%X%P: can not size stub section: %E\n");
return;
}
lang_for_each_statement (build_section_lists);
/* Call into the BFD backend to do the real work. */
if (!ppc64_elf_size_stubs (output_bfd,
stub_file->the_bfd,
&link_info,
group_size,
&ppc_add_stub_section,
&ppc_layout_sections_again))
{
einfo ("%X%P: can not size stub section: %E\n");
return;
}
}
if (need_laying_out)
ppc_layout_sections_again ();
if (stub_file->the_bfd->sections != NULL)
{
if (!ppc64_elf_build_stubs (&link_info))
einfo ("%X%P: can not build stubs: %E\n");
}
}
/* Avoid processing the fake stub_file in vercheck, stat_needed and
check_needed routines. */
static void ppc_for_each_input_file_wrapper
PARAMS ((lang_input_statement_type *));
static void ppc_lang_for_each_input_file
PARAMS ((void (*) (lang_input_statement_type *)));
static void (*real_func) PARAMS ((lang_input_statement_type *));
static void ppc_for_each_input_file_wrapper (l)
lang_input_statement_type *l;
{
if (l != stub_file)
(*real_func) (l);
}
static void
ppc_lang_for_each_input_file (func)
void (*func) PARAMS ((lang_input_statement_type *));
{
real_func = func;
lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
}
#define lang_for_each_input_file ppc_lang_for_each_input_file
EOF
# Define some shell vars to insert bits of code into the standard elf
# parse_args and list_options functions.
#
PARSE_AND_LIST_PROLOGUE='
#define OPTION_STUBGROUP_SIZE 301
'
# The options are repeated below so that no abbreviations are allowed.
# Otherwise -s matches stub-group-size
PARSE_AND_LIST_LONGOPTS='
{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
'
PARSE_AND_LIST_OPTIONS='
fprintf (file, _("\
--stub-group-size=N Maximum size of a group of input sections that can be\n\
handled by one stub section. A negative value\n\
locates all stubs before their branches (with a\n\
group size of -N), while a positive value allows\n\
two groups of input sections, one before, and one\n\
after each stub section. Values of +/-1 indicate\n\
the linker should choose suitable defaults.\n"
));
'
PARSE_AND_LIST_ARGS_CASES='
case OPTION_STUBGROUP_SIZE:
{
const char *end;
group_size = bfd_scan_vma (optarg, &end, 0);
if (*end)
einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
}
break;
'
# Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements