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/* D10V-specific support for 32-bit ELF

   Copyright 1996, 1998, 1999, 2000 Free Software Foundation, Inc.

   Contributed by Martin Hunt (hunt@cygnus.com).

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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bfd.h"

#include "sysdep.h"

#include "libbfd.h"

#include "elf-bfd.h"

#include "elf/d10v.h"

static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup

  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));

static void d10v_info_to_howto_rel

  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));

/* Use REL instead of RELA to save space */

#define USE_REL

static reloc_howto_type elf_d10v_howto_table[] =

{

  /* This reloc does nothing.  */

  HOWTO (R_D10V_NONE,           /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_D10V_NONE",         /* name */

         false,                 /* partial_inplace */

         0,                      /* src_mask */

         0,                      /* dst_mask */

         false),                /* pcrel_offset */

  /* An PC Relative 10-bit relocation, shifted by 2  */

  /* right container */

  HOWTO (R_D10V_10_PCREL_R,     /* type */

         2,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         10,                    /* bitsize */

         true,                  /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_D10V_10_PCREL_R",   /* name */

         false,                 /* partial_inplace */

         0xff,                  /* src_mask */

         0xff,                  /* dst_mask */

         true),                 /* pcrel_offset */

  /* An PC Relative 10-bit relocation, shifted by 2  */

  /* left container */

  HOWTO (R_D10V_10_PCREL_L,     /* type */

         2,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         10,                    /* bitsize */

         true,                  /* pc_relative */

         15,                    /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_D10V_10_PCREL_L",   /* name */

         false,                 /* partial_inplace */

         0x07f8000,                     /* src_mask */

         0x07f8000,             /* dst_mask */

         true),                 /* pcrel_offset */

  /* A 16 bit absolute relocation */

  HOWTO (R_D10V_16,             /* type */

         0,                      /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         16,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_dont, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_D10V_16",           /* name */

         false,                 /* partial_inplace */

         0xffff,                /* src_mask */

         0xffff,                /* dst_mask */

         false),                /* pcrel_offset */

  /* An 18 bit absolute relocation, right shifted 2 */

  HOWTO (R_D10V_18,             /* type */

         2,                     /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         18,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_dont, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_D10V_18",           /* name */

         false,                 /* partial_inplace */

         0xffff,                /* src_mask */

         0xffff,                /* dst_mask */

         false),                /* pcrel_offset */

  /* A relative 18 bit relocation, right shifted by 2  */

  HOWTO (R_D10V_18_PCREL,       /* type */

         2,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         18,                    /* bitsize */

         true,                  /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_D10V_18_PCREL",     /* name */

         false,                 /* partial_inplace */

         0xffff,                /* src_mask */

         0xffff,                /* dst_mask */

         true),                 /* pcrel_offset */

  /* A 32 bit absolute relocation */

  HOWTO (R_D10V_32,             /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         false,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         bfd_elf_generic_reloc, /* special_function */

         "R_D10V_32",           /* name */

         false,                 /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         false),                /* pcrel_offset */

  /* GNU extension to record C++ vtable hierarchy */

  HOWTO (R_D10V_GNU_VTINHERIT, /* type */

         0,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         0,                     /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_dont, /* complain_on_overflow */

         NULL,                  /* special_function */

         "R_D10V_GNU_VTINHERIT", /* name */

         false,                 /* partial_inplace */

         0,                     /* src_mask */

         0,                     /* dst_mask */

         false),                /* pcrel_offset */

  /* GNU extension to record C++ vtable member usage */

  HOWTO (R_D10V_GNU_VTENTRY,     /* type */

         0,                     /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         0,                     /* bitsize */

         false,                 /* pc_relative */

         0,                     /* bitpos */

         complain_overflow_dont, /* complain_on_overflow */

         _bfd_elf_rel_vtable_reloc_fn,  /* special_function */

         "R_D10V_GNU_VTENTRY",   /* name */

         false,                 /* partial_inplace */

         0,                     /* src_mask */

         0,                     /* dst_mask */

         false),                /* pcrel_offset */

};

/* Map BFD reloc types to D10V ELF reloc types.  */

struct d10v_reloc_map

{

  bfd_reloc_code_real_type bfd_reloc_val;

  unsigned char elf_reloc_val;

};

 static const struct d10v_reloc_map d10v_reloc_map[] =

{

  { BFD_RELOC_NONE, R_D10V_NONE, },

  { BFD_RELOC_D10V_10_PCREL_R, R_D10V_10_PCREL_R },

  { BFD_RELOC_D10V_10_PCREL_L, R_D10V_10_PCREL_L },

  { BFD_RELOC_16, R_D10V_16 },

  { BFD_RELOC_D10V_18, R_D10V_18 },

  { BFD_RELOC_D10V_18_PCREL, R_D10V_18_PCREL },

  { BFD_RELOC_32, R_D10V_32 },

  { BFD_RELOC_VTABLE_INHERIT, R_D10V_GNU_VTINHERIT },

  { BFD_RELOC_VTABLE_ENTRY, R_D10V_GNU_VTENTRY },

};

static reloc_howto_type *

bfd_elf32_bfd_reloc_type_lookup (abfd, code)

     bfd *abfd ATTRIBUTE_UNUSED;

     bfd_reloc_code_real_type code;

{

  unsigned int i;

  for (i = 0;

       i < sizeof (d10v_reloc_map) / sizeof (struct d10v_reloc_map);

       i++)

    {

      if (d10v_reloc_map[i].bfd_reloc_val == code)

        return &elf_d10v_howto_table[d10v_reloc_map[i].elf_reloc_val];

    }

  return NULL;

}

/* Set the howto pointer for an D10V ELF reloc.  */

static void

d10v_info_to_howto_rel (abfd, cache_ptr, dst)

     bfd *abfd ATTRIBUTE_UNUSED;

     arelent *cache_ptr;

     Elf32_Internal_Rel *dst;

{

  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);

  BFD_ASSERT (r_type < (unsigned int) R_D10V_max);

  cache_ptr->howto = &elf_d10v_howto_table[r_type];

}

static asection *

elf32_d10v_gc_mark_hook (abfd, info, rel, h, sym)

       bfd *abfd;

       struct bfd_link_info *info ATTRIBUTE_UNUSED;

       Elf_Internal_Rela *rel;

       struct elf_link_hash_entry *h;

       Elf_Internal_Sym *sym;

{

  if (h != NULL)

    {

      switch (ELF32_R_TYPE (rel->r_info))

      {

      case R_D10V_GNU_VTINHERIT:

      case R_D10V_GNU_VTENTRY:

        break;

      default:

        switch (h->root.type)

          {

          case bfd_link_hash_defined:

          case bfd_link_hash_defweak:

            return h->root.u.def.section;

          case bfd_link_hash_common:

            return h->root.u.c.p->section;

          default:

            break;

          }

       }

     }

   else

     {

       if (!(elf_bad_symtab (abfd)

           && ELF_ST_BIND (sym->st_info) != STB_LOCAL)

         && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)

                && sym->st_shndx != SHN_COMMON))

          {

            return bfd_section_from_elf_index (abfd, sym->st_shndx);

          }

      }

  return NULL;

}

static boolean

elf32_d10v_gc_sweep_hook (abfd, info, sec, relocs)

     bfd *abfd ATTRIBUTE_UNUSED;

     struct bfd_link_info *info ATTRIBUTE_UNUSED;

     asection *sec ATTRIBUTE_UNUSED;

     const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;

{

  /* we don't use got and plt entries for d10v */

  return true;

}

/* 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 boolean

elf32_d10v_check_relocs (abfd, info, sec, 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, **sym_hashes_end;

  const Elf_Internal_Rela *rel;

  const Elf_Internal_Rela *rel_end;

  if (info->relocateable)

    return true;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;

  sym_hashes = elf_sym_hashes (abfd);

  sym_hashes_end = sym_hashes + symtab_hdr->sh_size/sizeof (Elf32_External_Sym);

  if (!elf_bad_symtab (abfd))

    sym_hashes_end -= symtab_hdr->sh_info;

  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];

      switch (ELF32_R_TYPE (rel->r_info))

        {

        /* This relocation describes the C++ object vtable hierarchy.

           Reconstruct it for later use during GC.  */

        case R_D10V_GNU_VTINHERIT:

          if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))

            return false;

          break;

        /* This relocation describes which C++ vtable entries are actually

           used.  Record for later use during GC.  */

        case R_D10V_GNU_VTENTRY:

          if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))

            return false;

          break;

        }

    }

  return true;

}

/* Relocate a D10V ELF section.  */

static boolean

elf32_d10v_relocate_section (output_bfd, info, input_bfd, input_section,

                            contents, relocs, local_syms, local_sections)

     bfd *output_bfd ATTRIBUTE_UNUSED;

     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, *relend;

  const char *name;

  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;

  sym_hashes = elf_sym_hashes (input_bfd);

  rel = relocs;

  relend = relocs + input_section->reloc_count;

  for (; rel < relend; rel++)

    {

      int r_type;

      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;

      r_symndx = ELF32_R_SYM (rel->r_info);

      r_type = ELF32_R_TYPE (rel->r_info);

      if (r_type == R_D10V_GNU_VTENTRY

          || r_type == R_D10V_GNU_VTINHERIT )

        continue;

      howto = elf_d10v_howto_table + r_type;

      if (info->relocateable)

        {

          /* This is a relocateable link.  We don't have to change

             anything, unless the reloc is against a section symbol,

             in which case we have to adjust according to where the

             section symbol winds up in the output section.  */

          if (r_symndx < symtab_hdr->sh_info)

            {

              sym = local_syms + r_symndx;

              if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)

                {

                  sec = local_sections[r_symndx];

                  rel->r_addend += sec->output_offset + sym->st_value;

                }

            }

          continue;

        }

      /* This is a final link.  */

      h = NULL;

      sym = NULL;

      sec = NULL;

      if (r_symndx < symtab_hdr->sh_info)

        {

          sym = local_syms + r_symndx;

          sec = local_sections[r_symndx];

          relocation = (sec->output_section->vma

                        + sec->output_offset

                        + sym->st_value);

        }

      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;

          if (h->root.type == bfd_link_hash_defined

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

            {

              sec = h->root.u.def.section;

              relocation = (h->root.u.def.value

                            + sec->output_section->vma

                            + sec->output_offset);

            }

          else if (h->root.type == bfd_link_hash_undefweak)

            relocation = 0;

          else

            {

              if (!((*info->callbacks->undefined_symbol)

                    (info, h->root.root.string, input_bfd,

                     input_section, rel->r_offset, true)))

                return false;

              relocation = 0;

            }

        }

      if (h != NULL)

        name = h->root.root.string;

      else

        {

          name = (bfd_elf_string_from_elf_section

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

          if (name == NULL || *name == '\0')

            name = bfd_section_name (input_bfd, sec);

        }

      r = _bfd_final_link_relocate (howto, input_bfd, input_section,

                                    contents, rel->r_offset,

                                    relocation, rel->r_addend);

      if (r != bfd_reloc_ok)

        {

          const char * msg = (const char *) 0;

          switch (r)

            {

            case bfd_reloc_overflow:

              if (!((*info->callbacks->reloc_overflow)

                    (info, name, howto->name, (bfd_vma) 0,

                     input_bfd, input_section, rel->r_offset)))

                return false;

              break;

            case bfd_reloc_undefined:

              if (!((*info->callbacks->undefined_symbol)

                    (info, name, input_bfd, input_section,

                     rel->r_offset, true)))

                return false;

              break;

            case bfd_reloc_outofrange:

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

              goto common_error;

            case bfd_reloc_notsupported:

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

              goto common_error;

            case bfd_reloc_dangerous:

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

              goto common_error;

            default:

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

              /* fall through */

            common_error:

              if (!((*info->callbacks->warning)

                    (info, msg, name, input_bfd, input_section,

                     rel->r_offset)))

                return false;

              break;

            }

        }

    }

  return true;

}

#define ELF_ARCH                bfd_arch_d10v

#define ELF_MACHINE_CODE        EM_CYGNUS_D10V

#define ELF_MAXPAGESIZE         0x1000

#define TARGET_BIG_SYM          bfd_elf32_d10v_vec

#define TARGET_BIG_NAME         "elf32-d10v"

#define elf_info_to_howto                    0

#define elf_info_to_howto_rel                d10v_info_to_howto_rel

#define elf_backend_object_p                 0

#define elf_backend_final_write_processing   0

#define elf_backend_gc_mark_hook             elf32_d10v_gc_mark_hook

#define elf_backend_gc_sweep_hook            elf32_d10v_gc_sweep_hook

#define elf_backend_check_relocs             elf32_d10v_check_relocs

#define elf_backend_relocate_section         elf32_d10v_relocate_section

#define elf_backend_can_gc_sections          1

#include "elf32-target.h"