1  /* PowerPC64-specific support for 64-bit ELF.
       2     Copyright (C) 2002-2023 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    void (*edit) (void);
      31  
      32    /* Maximum size of a group of input sections that can be handled by
      33       one stub section.  A value of +/-1 indicates the bfd back-end
      34       should use a suitable default size.  */
      35    bfd_signed_vma group_size;
      36  
      37    /* Whether to use a special call stub for __tls_get_addr.  */
      38    int tls_get_addr_opt;
      39  
      40    /* Whether the special call stub should save r4..r12.  */
      41    int no_tls_get_addr_regsave;
      42  
      43    /* Whether to allow multiple toc sections.  */
      44    int no_multi_toc;
      45  
      46    /* Set if PLT call stubs should load r11.  */
      47    int plt_static_chain;
      48  
      49    /* Set if PLT call stubs need to be thread safe on power7+.  */
      50    int plt_thread_safe;
      51  
      52    /* Set if individual PLT call stubs should be aligned.  */
      53    int plt_stub_align;
      54  
      55    /* Set if PLT call stubs for localentry:0 functions should omit r2 save.  */
      56    int plt_localentry0;
      57  
      58    /* Whether to use power10 instructions in linkage stubs.  */
      59    int power10_stubs;
      60  
      61    /* Whether R_PPC64_PCREL_OPT should be ignored.  */
      62    int no_pcrel_opt;
      63  
      64    /* Whether to canonicalize .opd so that there are no overlapping
      65       .opd entries.  */
      66    int non_overlapping_opd;
      67  
      68    /* Whether to emit symbols for stubs.  */
      69    int emit_stub_syms;
      70  
      71    /* Whether to generate out-of-line register save/restore for gcc -Os code.  */
      72    int save_restore_funcs;
      73  
      74    /* Set when a potential variable is detected in .toc.  */
      75    int object_in_toc;
      76  };
      77  
      78  bool ppc64_elf_init_stub_bfd
      79    (struct bfd_link_info *, struct ppc64_elf_params *);
      80  bool ppc64_elf_edit_opd
      81    (struct bfd_link_info *);
      82  bool ppc64_elf_inline_plt
      83    (struct bfd_link_info *);
      84  bool ppc64_elf_tls_setup
      85    (struct bfd_link_info *);
      86  bool ppc64_elf_tls_optimize
      87    (struct bfd_link_info *);
      88  bool ppc64_elf_edit_toc
      89    (struct bfd_link_info *);
      90  bool ppc64_elf_has_small_toc_reloc
      91    (asection *);
      92  bfd_vma ppc64_elf_set_toc
      93    (struct bfd_link_info *, bfd *);
      94  int ppc64_elf_setup_section_lists
      95    (struct bfd_link_info *);
      96  void ppc64_elf_start_multitoc_partition
      97    (struct bfd_link_info *);
      98  bool ppc64_elf_next_toc_section
      99    (struct bfd_link_info *, asection *);
     100  bool ppc64_elf_layout_multitoc
     101    (struct bfd_link_info *);
     102  void ppc64_elf_finish_multitoc_partition
     103    (struct bfd_link_info *);
     104  bool ppc64_elf_check_init_fini
     105    (struct bfd_link_info *);
     106  bool ppc64_elf_next_input_section
     107    (struct bfd_link_info *, asection *);
     108  bool ppc64_elf_size_stubs
     109  (struct bfd_link_info *);
     110  bool ppc64_elf_build_stubs
     111    (struct bfd_link_info *, char **);