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8349035256
program_header_size.
528 lines
14 KiB
Plaintext
528 lines
14 KiB
Plaintext
# This shell script emits a C file. -*- C -*-
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# Copyright 2002, 2003 Free Software Foundation, Inc.
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#
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# This file is part of GLD, the Gnu Linker.
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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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# This file is sourced from elf32.em, and defines extra powerpc64-elf
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# specific routines.
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#
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cat >>e${EMULATION_NAME}.c <<EOF
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#include "ldctor.h"
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#include "libbfd.h"
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#include "elf-bfd.h"
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#include "elf64-ppc.h"
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/* Fake input file for stubs. */
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static lang_input_statement_type *stub_file;
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static int stub_added = 0;
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/* Whether we need to call ppc_layout_sections_again. */
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static int need_laying_out = 0;
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/* Maximum size of a group of input sections that can be handled by
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one stub section. A value of +/-1 indicates the bfd back-end
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should use a suitable default size. */
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static bfd_signed_vma group_size = 1;
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/* Whether to add ".foo" entries for each "foo" in a version script. */
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static int dotsyms = 1;
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/* Whether to run tls optimization. */
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static int notlsopt = 0;
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/* Whether to emit symbols for stubs. */
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static int emit_stub_syms = 0;
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static asection *toc_section = 0;
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/* This is called before the input files are opened. We create a new
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fake input file to hold the stub sections. */
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static void
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ppc_create_output_section_statements (void)
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{
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extern const bfd_target bfd_elf64_powerpc_vec;
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extern const bfd_target bfd_elf64_powerpcle_vec;
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if (link_info.hash->creator != &bfd_elf64_powerpc_vec
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&& link_info.hash->creator != &bfd_elf64_powerpcle_vec)
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return;
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stub_file = lang_add_input_file ("linker stubs",
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lang_input_file_is_fake_enum,
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NULL);
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stub_file->the_bfd = bfd_create ("linker stubs", output_bfd);
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if (stub_file->the_bfd == NULL
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|| !bfd_set_arch_mach (stub_file->the_bfd,
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bfd_get_arch (output_bfd),
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bfd_get_mach (output_bfd)))
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{
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einfo ("%X%P: can not create BFD %E\n");
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return;
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}
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ldlang_add_file (stub_file);
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ppc64_elf_init_stub_bfd (stub_file->the_bfd, &link_info);
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}
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static void
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ppc_after_open (void)
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{
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if (!ppc64_elf_mark_entry_syms (&link_info))
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{
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einfo ("%X%P: can not mark entry symbols %E\n");
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return;
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}
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gld${EMULATION_NAME}_after_open ();
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}
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static void
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ppc_before_allocation (void)
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{
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if (stub_file != NULL)
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{
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if (!ppc64_elf_edit_opd (output_bfd, &link_info))
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{
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einfo ("%X%P: can not edit opd %E\n");
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return;
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}
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if (ppc64_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
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{
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/* Size the sections. This is premature, but we want to know the
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TLS segment layout so that certain optimizations can be done. */
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lang_size_sections (stat_ptr->head, abs_output_section,
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&stat_ptr->head, 0, 0, NULL, TRUE);
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if (!ppc64_elf_tls_optimize (output_bfd, &link_info))
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{
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einfo ("%X%P: TLS problem %E\n");
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return;
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}
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/* We must not cache anything from the preliminary sizing. */
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elf_tdata (output_bfd)->program_header_size = 0;
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lang_reset_memory_regions ();
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}
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}
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gld${EMULATION_NAME}_before_allocation ();
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}
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struct hook_stub_info
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{
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lang_statement_list_type add;
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asection *input_section;
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};
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/* Traverse the linker tree to find the spot where the stub goes. */
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static bfd_boolean
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hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
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{
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lang_statement_union_type *l;
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bfd_boolean ret;
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for (; (l = *lp) != NULL; lp = &l->header.next)
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{
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switch (l->header.type)
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{
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case lang_constructors_statement_enum:
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ret = hook_in_stub (info, &constructor_list.head);
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if (ret)
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return ret;
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break;
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case lang_output_section_statement_enum:
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ret = hook_in_stub (info,
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&l->output_section_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_wild_statement_enum:
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ret = hook_in_stub (info, &l->wild_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_group_statement_enum:
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ret = hook_in_stub (info, &l->group_statement.children.head);
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if (ret)
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return ret;
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break;
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case lang_input_section_enum:
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if (l->input_section.section == info->input_section)
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{
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/* We've found our section. Insert the stub immediately
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before its associated input section. */
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*lp = info->add.head;
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*(info->add.tail) = l;
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return TRUE;
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}
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break;
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case lang_data_statement_enum:
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case lang_reloc_statement_enum:
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case lang_object_symbols_statement_enum:
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case lang_output_statement_enum:
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case lang_target_statement_enum:
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case lang_input_statement_enum:
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case lang_assignment_statement_enum:
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case lang_padding_statement_enum:
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case lang_address_statement_enum:
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case lang_fill_statement_enum:
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break;
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default:
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FAIL ();
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break;
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}
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}
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return FALSE;
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}
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/* Call-back for ppc64_elf_size_stubs. */
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/* Create a new stub section, and arrange for it to be linked
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immediately before INPUT_SECTION. */
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static asection *
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ppc_add_stub_section (const char *stub_sec_name, asection *input_section)
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{
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asection *stub_sec;
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flagword flags;
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asection *output_section;
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const char *secname;
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lang_output_section_statement_type *os;
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struct hook_stub_info info;
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stub_sec = bfd_make_section_anyway (stub_file->the_bfd, stub_sec_name);
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if (stub_sec == NULL)
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goto err_ret;
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flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
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| SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
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if (!bfd_set_section_flags (stub_file->the_bfd, stub_sec, flags))
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goto err_ret;
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output_section = input_section->output_section;
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secname = bfd_get_section_name (output_section->owner, output_section);
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os = lang_output_section_find (secname);
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info.input_section = input_section;
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lang_list_init (&info.add);
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lang_add_section (&info.add, stub_sec, os, stub_file);
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if (info.add.head == NULL)
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goto err_ret;
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stub_added = 1;
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if (hook_in_stub (&info, &os->children.head))
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return stub_sec;
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err_ret:
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einfo ("%X%P: can not make stub section: %E\n");
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return NULL;
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}
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/* Another call-back for ppc64_elf_size_stubs. */
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static void
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ppc_layout_sections_again (void)
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{
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/* If we have changed sizes of the stub sections, then we need
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to recalculate all the section offsets. This may mean we need to
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add even more stubs. */
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need_laying_out = 0;
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lang_reset_memory_regions ();
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/* Resize the sections. */
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lang_size_sections (stat_ptr->head, abs_output_section,
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&stat_ptr->head, 0, 0, NULL, TRUE);
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/* Recalculate TOC base. */
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ldemul_after_allocation ();
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/* Do the assignments again. */
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lang_do_assignments (stat_ptr->head, abs_output_section, NULL, 0);
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}
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/* Call the back-end function to set TOC base after we have placed all
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the sections. */
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static void
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gld${EMULATION_NAME}_after_allocation (void)
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{
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if (!link_info.relocatable)
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_bfd_set_gp_value (output_bfd, ppc64_elf_toc (output_bfd));
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}
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static void
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build_toc_list (lang_statement_union_type *statement)
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{
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if (statement->header.type == lang_input_section_enum
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&& !statement->input_section.ifile->just_syms_flag
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&& statement->input_section.section->output_section == toc_section)
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ppc64_elf_next_toc_section (&link_info, statement->input_section.section);
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}
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static void
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build_section_lists (lang_statement_union_type *statement)
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{
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if (statement->header.type == lang_input_section_enum
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&& !statement->input_section.ifile->just_syms_flag
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&& statement->input_section.section->output_section != NULL
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&& statement->input_section.section->output_section->owner == output_bfd)
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{
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if (!ppc64_elf_next_input_section (&link_info,
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statement->input_section.section))
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einfo ("%X%P: can not size stub section: %E\n");
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}
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}
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/* Final emulation specific call. */
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static void
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gld${EMULATION_NAME}_finish (void)
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{
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/* e_entry on PowerPC64 points to the function descriptor for
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_start. If _start is missing, default to the first function
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descriptor in the .opd section. */
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entry_section = ".opd";
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/* bfd_elf64_discard_info just plays with debugging sections,
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ie. doesn't affect any code, so we can delay resizing the
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sections. It's likely we'll resize everything in the process of
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adding stubs. */
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if (bfd_elf${ELFSIZE}_discard_info (output_bfd, &link_info))
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need_laying_out = 1;
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/* If generating a relocatable output file, then we don't have any
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stubs. */
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if (stub_file != NULL && !link_info.relocatable)
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{
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int ret = ppc64_elf_setup_section_lists (output_bfd, &link_info);
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if (ret != 0)
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{
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if (ret < 0)
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{
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einfo ("%X%P: can not size stub section: %E\n");
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return;
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}
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toc_section = bfd_get_section_by_name (output_bfd, ".got");
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if (toc_section != NULL)
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lang_for_each_statement (build_toc_list);
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ppc64_elf_reinit_toc (output_bfd, &link_info);
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lang_for_each_statement (build_section_lists);
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/* Call into the BFD backend to do the real work. */
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if (!ppc64_elf_size_stubs (output_bfd,
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&link_info,
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group_size,
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&ppc_add_stub_section,
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&ppc_layout_sections_again))
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{
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einfo ("%X%P: can not size stub section: %E\n");
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return;
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}
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}
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}
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if (need_laying_out)
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ppc_layout_sections_again ();
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if (stub_added)
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{
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char *msg = NULL;
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char *line, *endline;
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if (!ppc64_elf_build_stubs (emit_stub_syms, &link_info,
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config.stats ? &msg : NULL))
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einfo ("%X%P: can not build stubs: %E\n");
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for (line = msg; line != NULL; line = endline)
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{
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endline = strchr (line, '\n');
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if (endline != NULL)
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*endline++ = '\0';
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fprintf (stderr, "%s: %s\n", program_name, line);
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}
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if (msg != NULL)
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free (msg);
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}
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}
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/* Add a pattern matching ".foo" for every "foo" in a version script.
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The reason for doing this is that many shared library version
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scripts export a selected set of functions or data symbols, forcing
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others local. eg.
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. VERS_1 {
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. global:
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. this; that; some; thing;
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. local:
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. *;
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. };
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To make the above work for PowerPC64, we need to export ".this",
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".that" and so on, otherwise only the function descriptor syms are
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exported. Lack of an exported function code sym may cause a
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definition to be pulled in from a static library. */
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static struct bfd_elf_version_expr *
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gld${EMULATION_NAME}_new_vers_pattern (struct bfd_elf_version_expr *entry)
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{
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struct bfd_elf_version_expr *dot_entry;
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unsigned int len;
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char *dot_pat;
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if (!dotsyms || entry->pattern[0] == '*' || entry->pattern[0] == '.')
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return entry;
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dot_entry = xmalloc (sizeof *dot_entry);
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*dot_entry = *entry;
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dot_entry->next = entry;
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len = strlen (entry->pattern) + 2;
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dot_pat = xmalloc (len);
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dot_pat[0] = '.';
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memcpy (dot_pat + 1, entry->pattern, len - 1);
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dot_entry->pattern = dot_pat;
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return dot_entry;
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}
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/* Avoid processing the fake stub_file in vercheck, stat_needed and
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check_needed routines. */
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static void (*real_func) (lang_input_statement_type *);
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static void ppc_for_each_input_file_wrapper (lang_input_statement_type *l)
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{
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if (l != stub_file)
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(*real_func) (l);
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}
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static void
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ppc_lang_for_each_input_file (void (*func) (lang_input_statement_type *))
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{
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real_func = func;
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lang_for_each_input_file (&ppc_for_each_input_file_wrapper);
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}
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#define lang_for_each_input_file ppc_lang_for_each_input_file
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EOF
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# Define some shell vars to insert bits of code into the standard elf
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# parse_args and list_options functions.
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#
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PARSE_AND_LIST_PROLOGUE='
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#define OPTION_STUBGROUP_SIZE 301
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#define OPTION_STUBSYMS (OPTION_STUBGROUP_SIZE + 1)
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#define OPTION_DOTSYMS (OPTION_STUBSYMS + 1)
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#define OPTION_NO_DOTSYMS (OPTION_DOTSYMS + 1)
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#define OPTION_NO_TLS_OPT (OPTION_NO_DOTSYMS + 1)
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'
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PARSE_AND_LIST_LONGOPTS='
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{ "stub-group-size", required_argument, NULL, OPTION_STUBGROUP_SIZE },
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{ "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
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{ "dotsyms", no_argument, NULL, OPTION_DOTSYMS },
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{ "no-dotsyms", no_argument, NULL, OPTION_NO_DOTSYMS },
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{ "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
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'
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PARSE_AND_LIST_OPTIONS='
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fprintf (file, _("\
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--stub-group-size=N Maximum size of a group of input sections that can be\n\
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handled by one stub section. A negative value\n\
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locates all stubs before their branches (with a\n\
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group size of -N), while a positive value allows\n\
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two groups of input sections, one before, and one\n\
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after each stub section. Values of +/-1 indicate\n\
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the linker should choose suitable defaults.\n"
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));
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fprintf (file, _("\
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--emit-stub-syms Label linker stubs with a symbol.\n"
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));
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fprintf (file, _("\
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--dotsyms For every version pattern \"foo\" in a version script,\n\
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add \".foo\" so that function code symbols are\n\
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treated the same as function descriptor symbols.\n\
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Defaults to on.\n"
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));
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fprintf (file, _("\
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--no-dotsyms Don'\''t do anything special in version scripts.\n"
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));
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fprintf (file, _("\
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--no-tls-optimize Don'\''t try to optimize TLS accesses.\n"
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));
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'
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PARSE_AND_LIST_ARGS_CASES='
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case OPTION_STUBGROUP_SIZE:
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{
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const char *end;
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group_size = bfd_scan_vma (optarg, &end, 0);
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if (*end)
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einfo (_("%P%F: invalid number `%s'\''\n"), optarg);
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}
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break;
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case OPTION_STUBSYMS:
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emit_stub_syms = 1;
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break;
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case OPTION_DOTSYMS:
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dotsyms = 1;
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break;
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case OPTION_NO_DOTSYMS:
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dotsyms = 0;
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break;
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case OPTION_NO_TLS_OPT:
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notlsopt = 1;
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break;
|
|
'
|
|
|
|
# Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
|
|
#
|
|
LDEMUL_AFTER_OPEN=ppc_after_open
|
|
LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
|
|
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
|
|
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
|
|
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_create_output_section_statements
|
|
LDEMUL_NEW_VERS_PATTERN=gld${EMULATION_NAME}_new_vers_pattern
|