/* moxie-specific support for 32-bit ELF.

   Copyright (C) 2009-2025 Free Software Foundation, Inc.

   Copied from elf32-fr30.c which is..

   Copyright (C) 1998-2025 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, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

#include "sysdep.h"

#include "bfd.h"

#include "libbfd.h"

#include "elf-bfd.h"

#include "elf/moxie.h"

/* Forward declarations.  */

static reloc_howto_type moxie_elf_howto_table [] =

{

  /* This reloc does nothing.  */

  HOWTO (R_MOXIE_NONE,    /* type */

   0,     /* rightshift */

   0,     /* size */

   0,     /* bitsize */

   false,     /* pc_relative */

   0,     /* bitpos */

   complain_overflow_dont, /* complain_on_overflow */

   bfd_elf_generic_reloc, /* special_function */

   "R_MOXIE_NONE",    /* name */

   false,     /* partial_inplace */

   0,     /* src_mask */

   0,     /* dst_mask */

   false),    /* pcrel_offset */

  /* A 32 bit absolute relocation.  */

  HOWTO (R_MOXIE_32,    /* type */

   0,     /* rightshift */

   4,     /* size */

   32,      /* bitsize */

   false,     /* pc_relative */

   0,     /* bitpos */

   complain_overflow_bitfield, /* complain_on_overflow */

   bfd_elf_generic_reloc, /* special_function */

   "R_MOXIE_32",    /* name */

   false,     /* partial_inplace */

   0x00000000,    /* src_mask */

   0xffffffff,    /* dst_mask */

   false),    /* pcrel_offset */

  /* A 10 bit PC-relative relocation.  */

  HOWTO (R_MOXIE_PCREL10, /* type.  */

   1,     /* rightshift.  */

   2,     /* size.  */

   10,      /* bitsize.  */

   true,      /* pc_relative.  */

   0,     /* bitpos.  */

   complain_overflow_signed, /* complain_on_overflow.  */

   bfd_elf_generic_reloc, /* special_function.  */

   "R_MOXIE_PCREL10",   /* name.  */

   false,     /* partial_inplace.  */

   0,     /* src_mask.  */

   0x000003FF,    /* dst_mask.  */

   true),     /* pcrel_offset.  */

};

/* Map BFD reloc types to MOXIE ELF reloc types.  */

struct moxie_reloc_map

{

  bfd_reloc_code_real_type bfd_reloc_val;

  unsigned int moxie_reloc_val;

};

static const struct moxie_reloc_map moxie_reloc_map [] =

{

  { BFD_RELOC_NONE,        R_MOXIE_NONE },

  { BFD_RELOC_32,        R_MOXIE_32 },

  { BFD_RELOC_MOXIE_10_PCREL,  R_MOXIE_PCREL10 },

};

static reloc_howto_type *

moxie_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,

       bfd_reloc_code_real_type code)

{

  unsigned int i;

  for (i = sizeof (moxie_reloc_map) / sizeof (moxie_reloc_map[0]);

       i--;)

    if (moxie_reloc_map [i].bfd_reloc_val == code)

      return & moxie_elf_howto_table [moxie_reloc_map[i].moxie_reloc_val];

  return NULL;

}

static reloc_howto_type *

moxie_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)

{

  unsigned int i;

  for (i = 0;

       i < sizeof (moxie_elf_howto_table) / sizeof (moxie_elf_howto_table[0]);

       i++)

    if (moxie_elf_howto_table[i].name != NULL

  && strcasecmp (moxie_elf_howto_table[i].name, r_name) == 0)

      return &moxie_elf_howto_table[i];

  return NULL;

}

/* Set the howto pointer for an MOXIE ELF reloc.  */

static bool

moxie_info_to_howto_rela (bfd *abfd,

        arelent *cache_ptr,

        Elf_Internal_Rela *dst)

{

  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);

  if (r_type >= (unsigned int) R_MOXIE_max)

    {

      /* xgettext:c-format */

      _bfd_error_handler (_("%pB: unsupported relocation type %#x"),

        abfd, r_type);

      bfd_set_error (bfd_error_bad_value);

      return false;

    }

  cache_ptr->howto = & moxie_elf_howto_table [r_type];

  return true;

}

/* Perform a single relocation.  By default we use the standard BFD

   routines, but a few relocs, we have to do them ourselves.  */

static bfd_reloc_status_type

moxie_final_link_relocate (reloc_howto_type *howto,

         bfd *input_bfd,

         asection *input_section,

         bfd_byte *contents,

         Elf_Internal_Rela *rel,

         bfd_vma relocation)

{

  bfd_reloc_status_type r = bfd_reloc_ok;

  switch (howto->type)

    {

    default:

      r = _bfd_final_link_relocate (howto, input_bfd, input_section,

            contents, rel->r_offset,

            relocation, rel->r_addend);

    }

  return r;

}

/* Relocate an MOXIE ELF section.

   The RELOCATE_SECTION function is called by the new ELF backend linker

   to handle the relocations for a section.

   The relocs are always passed as Rela structures; if the section

   actually uses Rel structures, the r_addend field will always be

   zero.

   This function is responsible for adjusting the section contents as

   necessary, and (if using Rela relocs and generating a relocatable

   output file) adjusting the reloc addend as necessary.

   This function does not have to worry about setting the reloc

   address or the reloc symbol index.

   LOCAL_SYMS is a pointer to the swapped in local symbols.

   LOCAL_SECTIONS is an array giving the section in the input file

   corresponding to the st_shndx field of each local symbol.

   The global hash table entry for the global symbols can be found

   via elf_sym_hashes (input_bfd).

   When generating relocatable output, this function must handle

   STB_LOCAL/STT_SECTION symbols specially.  The output symbol is

   going to be the section symbol corresponding to the output

   section, which means that the addend must be adjusted

   accordingly.  */

static int

moxie_elf_relocate_section (bfd *output_bfd,

          struct bfd_link_info *info,

          bfd *input_bfd,

          asection *input_section,

          bfd_byte *contents,

          Elf_Internal_Rela *relocs,

          Elf_Internal_Sym *local_syms,

          asection **local_sections)

{

  Elf_Internal_Shdr *symtab_hdr;

  struct elf_link_hash_entry **sym_hashes;

  Elf_Internal_Rela *rel;

  Elf_Internal_Rela *relend;

  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;

  sym_hashes = elf_sym_hashes (input_bfd);

  relend     = relocs + input_section->reloc_count;

  for (rel = relocs; rel < relend; rel ++)

    {

      reloc_howto_type *howto;

      unsigned long r_symndx;

      Elf_Internal_Sym *sym;

      asection *sec;

      struct elf_link_hash_entry *h;

      bfd_vma relocation;

      bfd_reloc_status_type r;

      const char *name;

      int r_type;

      r_type = ELF32_R_TYPE (rel->r_info);

      r_symndx = ELF32_R_SYM (rel->r_info);

      howto  = moxie_elf_howto_table + r_type;

      h      = NULL;

      sym    = NULL;

      sec    = NULL;

      if (r_symndx < symtab_hdr->sh_info)

  {

    sym = local_syms + r_symndx;

    sec = local_sections [r_symndx];

    relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);

    name = bfd_elf_string_from_elf_section

      (input_bfd, symtab_hdr->sh_link, sym->st_name);

    name = name == NULL ? bfd_section_name (sec) : name;

  }

      else

  {

    bool unresolved_reloc, warned, ignored;

    RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,

           r_symndx, symtab_hdr, sym_hashes,

           h, sec, relocation,

           unresolved_reloc, warned, ignored);

    name = h->root.root.string;

  }

      if (sec != NULL && discarded_section (sec))

  RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,

           rel, 1, relend, howto, 0, contents);

      if (bfd_link_relocatable (info))

  continue;

      r = moxie_final_link_relocate (howto, input_bfd, input_section,

             contents, rel, relocation);

      if (r != bfd_reloc_ok)

  {

    const char * msg = NULL;

    switch (r)

      {

      case bfd_reloc_overflow:

        (*info->callbacks->reloc_overflow)

    (info, (h ? &h->root : NULL), name, howto->name,

     (bfd_vma) 0, input_bfd, input_section, rel->r_offset);

        break;

      case bfd_reloc_undefined:

        (*info->callbacks->undefined_symbol)

    (info, name, input_bfd, input_section, rel->r_offset, true);

        break;

      case bfd_reloc_outofrange:

        msg = _("internal error: out of range error");

        break;

      case bfd_reloc_notsupported:

        msg = _("internal error: unsupported relocation error");

        break;

      case bfd_reloc_dangerous:

        msg = _("internal error: dangerous relocation");

        break;

      default:

        msg = _("internal error: unknown error");

        break;

      }

    if (msg)

      (*info->callbacks->warning) (info, msg, name, input_bfd,

           input_section, rel->r_offset);

  }

    }

  return true;

}

/* Return the section that should be marked against GC for a given

   relocation.  */

static asection *

moxie_elf_gc_mark_hook (asection *sec,

      struct bfd_link_info *info,

      Elf_Internal_Rela *rel,

      struct elf_link_hash_entry *h,

      Elf_Internal_Sym *sym)

{

  return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);

}

/* Look through the relocs for a section during the first phase.

   Since we don't do .gots or .plts, we just need to consider the

   virtual table relocs for gc.  */

static bool

moxie_elf_check_relocs (bfd *abfd,

      struct bfd_link_info *info,

      asection *sec,

      const Elf_Internal_Rela *relocs)

{

  Elf_Internal_Shdr *symtab_hdr;

  struct elf_link_hash_entry **sym_hashes;

  const Elf_Internal_Rela *rel;

  const Elf_Internal_Rela *rel_end;

  if (bfd_link_relocatable (info))

    return true;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;

  sym_hashes = elf_sym_hashes (abfd);

  rel_end = relocs + sec->reloc_count;

  for (rel = relocs; rel < rel_end; rel++)

    {

      struct elf_link_hash_entry *h;

      unsigned long r_symndx;

      r_symndx = ELF32_R_SYM (rel->r_info);

      if (r_symndx < symtab_hdr->sh_info)

  h = NULL;

      else

  {

    h = sym_hashes[r_symndx - symtab_hdr->sh_info];

    while (h->root.type == bfd_link_hash_indirect

     || h->root.type == bfd_link_hash_warning)

      h = (struct elf_link_hash_entry *) h->root.u.i.link;

  }

    }

  return true;

}

#define ELF_ARCH    bfd_arch_moxie

#define ELF_MACHINE_CODE  EM_MOXIE

#define ELF_MACHINE_ALT1  EM_MOXIE_OLD

#define ELF_MAXPAGESIZE   0x1

#define TARGET_BIG_SYM    moxie_elf32_be_vec

#define TARGET_BIG_NAME   "elf32-bigmoxie"

#define TARGET_LITTLE_SYM moxie_elf32_le_vec

#define TARGET_LITTLE_NAME  "elf32-littlemoxie"

#define elf_info_to_howto_rel     NULL

#define elf_info_to_howto     moxie_info_to_howto_rela

#define elf_backend_relocate_section    moxie_elf_relocate_section

#define elf_backend_gc_mark_hook    moxie_elf_gc_mark_hook

#define elf_backend_check_relocs    moxie_elf_check_relocs

#define elf_backend_can_gc_sections   1

#define elf_backend_rela_normal     1

#define bfd_elf32_bfd_reloc_type_lookup   moxie_reloc_type_lookup

#define bfd_elf32_bfd_reloc_name_lookup   moxie_reloc_name_lookup

#include "elf32-target.h"