/* VxWorks support for ELF

   Copyright (C) 2005-2023 Free Software Foundation, Inc.

   This file is part of BFD, the Binary File Descriptor library.

   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 3 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, see <http://www.gnu.org/licenses/>.  */

/* This file provides routines used by all VxWorks targets.  */

#include "sysdep.h"

#include "bfd.h"

#include "libbfd.h"

#include "elf-bfd.h"

#include "elf-vxworks.h"

#include "elf/vxworks.h"

/* Return true if symbol NAME, as defined by ABFD, is one of the special

   __GOTT_BASE__ or __GOTT_INDEX__ symbols.  */

static bool

elf_vxworks_gott_symbol_p (bfd *abfd, const char *name)

{

  char leading;

  leading = bfd_get_symbol_leading_char (abfd);

  if (leading)

    {

      if (*name != leading)

  return false;

      name++;

    }

  return (strcmp (name, "__GOTT_BASE__") == 0

    || strcmp (name, "__GOTT_INDEX__") == 0);

}

/* Tweak magic VxWorks symbols as they are loaded.  */

bool

elf_vxworks_add_symbol_hook (bfd *abfd,

           struct bfd_link_info *info,

           Elf_Internal_Sym *sym,

           const char **namep,

           flagword *flagsp,

           asection **secp ATTRIBUTE_UNUSED,

           bfd_vma *valp ATTRIBUTE_UNUSED)

{

  /* Ideally these "magic" symbols would be exported by libc.so.1

     which would be found via a DT_NEEDED tag, and then handled

     specially by the linker at runtime.  Except shared libraries

     don't even link to libc.so.1 by default...

     If the symbol is imported from, or will be put in a shared library,

     give the symbol weak binding to get the desired samantics.

     This transformation will be undone in

     elf_i386_vxworks_link_output_symbol_hook. */

  if ((bfd_link_pic (info) || abfd->flags & DYNAMIC)

      && elf_vxworks_gott_symbol_p (abfd, *namep))

    {

      sym->st_info = ELF_ST_INFO (STB_WEAK, ELF_ST_TYPE (sym->st_info));

      *flagsp |= BSF_WEAK;

    }

  return true;

}

/* Perform VxWorks-specific handling of the create_dynamic_sections hook.

   When creating an executable, set *SRELPLT2_OUT to the .rel(a).plt.unloaded

   section.  */

bool

elf_vxworks_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info,

             asection **srelplt2_out)

{

  struct elf_link_hash_table *htab;

  const struct elf_backend_data *bed;

  asection *s;

  htab = elf_hash_table (info);

  bed = get_elf_backend_data (dynobj);

  if (!bfd_link_pic (info))

    {

      s = bfd_make_section_anyway_with_flags (dynobj,

                bed->default_use_rela_p

                ? ".rela.plt.unloaded"

                : ".rel.plt.unloaded",

                SEC_HAS_CONTENTS | SEC_IN_MEMORY

                | SEC_READONLY

                | SEC_LINKER_CREATED);

      if (s == NULL

    || !bfd_set_section_alignment (s, bed->s->log_file_align))

  return false;

      *srelplt2_out = s;

    }

  /* Mark the GOT and PLT symbols as having relocations; they might

     not, but we won't know for sure until we build the GOT in

     finish_dynamic_symbol.  Also make sure that the GOT symbol

     is entered into the dynamic symbol table; the loader uses it

     to initialize __GOTT_BASE__[__GOTT_INDEX__].  */

  if (htab->hgot)

    {

      htab->hgot->indx = -2;

      htab->hgot->other &= ~ELF_ST_VISIBILITY (-1);

      htab->hgot->forced_local = 0;

      if (!bfd_elf_link_record_dynamic_symbol (info, htab->hgot))

  return false;

    }

  if (htab->hplt)

    {

      htab->hplt->indx = -2;

      htab->hplt->type = STT_FUNC;

    }

  return true;

}

/* Tweak magic VxWorks symbols as they are written to the output file.  */

int

elf_vxworks_link_output_symbol_hook (struct bfd_link_info *info

               ATTRIBUTE_UNUSED,

             const char *name,

             Elf_Internal_Sym *sym,

             asection *input_sec ATTRIBUTE_UNUSED,

             struct elf_link_hash_entry *h)

{

  /* Reverse the effects of the hack in elf_vxworks_add_symbol_hook.  */

  if (h

      && h->root.type == bfd_link_hash_undefweak

      && elf_vxworks_gott_symbol_p (h->root.u.undef.abfd, name))

    sym->st_info = ELF_ST_INFO (STB_GLOBAL, ELF_ST_TYPE (sym->st_info));

  return 1;

}

/* Copy relocations into the output file.  Fixes up relocations against PLT

   entries, then calls the generic routine.  */

bool

elf_vxworks_emit_relocs (bfd *output_bfd,

       asection *input_section,

       Elf_Internal_Shdr *input_rel_hdr,

       Elf_Internal_Rela *internal_relocs,

       struct elf_link_hash_entry **rel_hash)

{

  const struct elf_backend_data *bed;

  int j;

  bed = get_elf_backend_data (output_bfd);

  if (output_bfd->flags & (DYNAMIC|EXEC_P))

    {

      Elf_Internal_Rela *irela;

      Elf_Internal_Rela *irelaend;

      struct elf_link_hash_entry **hash_ptr;

      for (irela = internal_relocs,

       irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)

         * bed->s->int_rels_per_ext_rel),

       hash_ptr = rel_hash;

     irela < irelaend;

     irela += bed->s->int_rels_per_ext_rel,

       hash_ptr++)

  {

    if (*hash_ptr

        && (*hash_ptr)->def_dynamic

        && !(*hash_ptr)->def_regular

        && ((*hash_ptr)->root.type == bfd_link_hash_defined

      || (*hash_ptr)->root.type == bfd_link_hash_defweak)

        && (*hash_ptr)->root.u.def.section->output_section != NULL)

      {

        /* This is a relocation from an executable or shared

     library against a symbol in a different shared

     library.  We are creating a definition in the output

     file but it does not come from any of our normal (.o)

     files. ie. a PLT stub.  Normally this would be a

     relocation against against SHN_UNDEF with the VMA of

     the PLT stub.  This upsets the VxWorks loader.

     Convert it to a section-relative relocation.  This

     gets some other symbols (for instance .dynbss), but

     is conservatively correct.  */

        for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)

    {

      asection *sec = (*hash_ptr)->root.u.def.section;

      int this_idx = sec->output_section->target_index;

      irela[j].r_info

        = ELF32_R_INFO (this_idx, ELF32_R_TYPE (irela[j].r_info));

      irela[j].r_addend += (*hash_ptr)->root.u.def.value;

      irela[j].r_addend += sec->output_offset;

    }

        /* Stop the generic routine adjusting this entry.  */

        *hash_ptr = NULL;

      }

  }

    }

  return _bfd_elf_link_output_relocs (output_bfd, input_section,

              input_rel_hdr, internal_relocs,

              rel_hash);

}

/* Set the sh_link and sh_info fields on the static plt relocation secton.  */

bool

elf_vxworks_final_write_processing (bfd *abfd)

{

  asection * sec;

  struct bfd_elf_section_data *d;

  sec = bfd_get_section_by_name (abfd, ".rel.plt.unloaded");

  if (!sec)

    sec = bfd_get_section_by_name (abfd, ".rela.plt.unloaded");

  if (sec)

    {

      d = elf_section_data (sec);

      d->this_hdr.sh_link = elf_onesymtab (abfd);

      sec = bfd_get_section_by_name (abfd, ".plt");

      if (sec)

  d->this_hdr.sh_info = elf_section_data (sec)->this_idx;

    }

  return _bfd_elf_final_write_processing (abfd);

}

/* Add the dynamic entries required by VxWorks.  These point to the

   tls sections.  */

bool

elf_vxworks_add_dynamic_entries (bfd *output_bfd, struct bfd_link_info *info)

{

  if (bfd_get_section_by_name (output_bfd, ".tls_data"))

    {

      if (!_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_START, 0)

    || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_SIZE, 0)

    || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_DATA_ALIGN, 0))

  return false;

    }

  if (bfd_get_section_by_name (output_bfd, ".tls_vars"))

    {

      if (!_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_VARS_START, 0)

    || !_bfd_elf_add_dynamic_entry (info, DT_VX_WRS_TLS_VARS_SIZE, 0))

  return false;

    }

  return true;

}

/* If *DYN is one of the VxWorks-specific dynamic entries, then fill

   in the value now  and return TRUE.  Otherwise return FALSE.  */

bool

elf_vxworks_finish_dynamic_entry (bfd *output_bfd, Elf_Internal_Dyn *dyn)

{

  asection *sec;

  switch (dyn->d_tag)

    {

    default:

      return false;

    case DT_VX_WRS_TLS_DATA_START:

      sec = bfd_get_section_by_name (output_bfd, ".tls_data");

      dyn->d_un.d_ptr = sec->vma;

      break;

    case DT_VX_WRS_TLS_DATA_SIZE:

      sec = bfd_get_section_by_name (output_bfd, ".tls_data");

      dyn->d_un.d_val = sec->size;

      break;

    case DT_VX_WRS_TLS_DATA_ALIGN:

      sec = bfd_get_section_by_name (output_bfd, ".tls_data");

      dyn->d_un.d_val = (bfd_size_type) 1 << bfd_section_alignment (sec);

      break;

    case DT_VX_WRS_TLS_VARS_START:

      sec = bfd_get_section_by_name (output_bfd, ".tls_vars");

      dyn->d_un.d_ptr = sec->vma;

      break;

    case DT_VX_WRS_TLS_VARS_SIZE:

      sec = bfd_get_section_by_name (output_bfd, ".tls_vars");

      dyn->d_un.d_val = sec->size;

      break;

    }

  return true;

}

/* Add dynamic tags.  */

bool

_bfd_elf_maybe_vxworks_add_dynamic_tags (bfd *output_bfd,

           struct bfd_link_info *info,

           bool need_dynamic_reloc)

{

  struct elf_link_hash_table *htab = elf_hash_table (info);

  return (_bfd_elf_add_dynamic_tags (output_bfd, info,

             need_dynamic_reloc)

    && (!htab->dynamic_sections_created

        || htab->target_os != is_vxworks

        || elf_vxworks_add_dynamic_entries (output_bfd, info)));

}