bfd/elf64-ppc.h

   1 /* PowerPC64-specific support for 64-bit ELF.
   2    Copyright (C) 2002-2020 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 /* Used to pass info between ld and bfd.  */
  22 struct ppc64_elf_params
  23 {
  24   /* Linker stub bfd.  */
  25   bfd *stub_bfd;
  26
  27   /* Linker call-backs.  */
  28   asection * (*add_stub_section) (const char *, asection *);
  29   void (*layout_sections_again) (void);
  30
  31   /* Maximum size of a group of input sections that can be handled by
  32      one stub section.  A value of +/-1 indicates the bfd back-end
  33      should use a suitable default size.  */
  34   bfd_signed_vma group_size;
  35
  36   /* Whether to use a special call stub for __tls_get_addr.  */
  37   int tls_get_addr_opt;
  38
  39   /* Whether the special call stub should save r4..r12.  */
  40   int no_tls_get_addr_regsave;
  41
  42   /* Whether to allow multiple toc sections.  */
  43   int no_multi_toc;
  44
  45   /* Set if PLT call stubs should load r11.  */
  46   int plt_static_chain;
  47
  48   /* Set if PLT call stubs need to be thread safe on power7+.  */
  49   int plt_thread_safe;
  50
  51   /* Set if individual PLT call stubs should be aligned.  */
  52   int plt_stub_align;
  53
  54   /* Set if PLT call stubs for localentry:0 functions should omit r2 save.  */
  55   int plt_localentry0;
  56
  57   /* Whether to canonicalize .opd so that there are no overlapping
  58      .opd entries.  */
  59   int non_overlapping_opd;
  60
  61   /* Whether to emit symbols for stubs.  */
  62   int emit_stub_syms;
  63
  64   /* Whether to generate out-of-line register save/restore for gcc -Os code.  */
  65   int save_restore_funcs;
  66
  67   /* Set when a potential variable is detected in .toc.  */
  68   int object_in_toc;
  69 };
  70
  71 bfd_boolean ppc64_elf_init_stub_bfd
  72   (struct bfd_link_info *, struct ppc64_elf_params *);
  73 bfd_boolean ppc64_elf_edit_opd
  74   (struct bfd_link_info *);
  75 bfd_boolean ppc64_elf_inline_plt
  76   (struct bfd_link_info *);
  77 asection *ppc64_elf_tls_setup
  78   (struct bfd_link_info *);
  79 bfd_boolean ppc64_elf_tls_optimize
  80   (struct bfd_link_info *);
  81 bfd_boolean ppc64_elf_edit_toc
  82   (struct bfd_link_info *);
  83 bfd_boolean ppc64_elf_has_small_toc_reloc
  84   (asection *);
  85 bfd_vma ppc64_elf_set_toc
  86   (struct bfd_link_info *, bfd *);
  87 int ppc64_elf_setup_section_lists
  88   (struct bfd_link_info *);
  89 void ppc64_elf_start_multitoc_partition
  90   (struct bfd_link_info *);
  91 bfd_boolean ppc64_elf_next_toc_section
  92   (struct bfd_link_info *, asection *);
  93 bfd_boolean ppc64_elf_layout_multitoc
  94   (struct bfd_link_info *);
  95 void ppc64_elf_finish_multitoc_partition
  96   (struct bfd_link_info *);
  97 bfd_boolean ppc64_elf_check_init_fini
  98   (struct bfd_link_info *);
  99 bfd_boolean ppc64_elf_next_input_section
 100   (struct bfd_link_info *, asection *);
 101 bfd_boolean ppc64_elf_size_stubs
 102 (struct bfd_link_info *);
 103 bfd_boolean ppc64_elf_build_stubs
 104   (struct bfd_link_info *, char **);