/* ft32-specific support for 32-bit ELF.
   Copyright (C) 2013-2016 Free Software Foundation, Inc.

   Copied from elf32-moxie.c which is..
   Copyright (C) 2009-2016 Free Software Foundation, Inc.
   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/ft32.h"

/* Forward declarations.  */

static reloc_howto_type ft32_elf_howto_table [] =
{
  /* This reloc does nothing.  */
  HOWTO (R_FT32_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_FT32_NONE",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 32 bit absolute relocation.  */

  HOWTO (R_FT32_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_FT32_32",		/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_FT32_16,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FT32_16",		/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0x0000ffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_FT32_8,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FT32_8",		/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0x000000ff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_FT32_10,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 10,			/* bitsize */
	 FALSE,			/* pc_relative */
	 4,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FT32_10",		/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0x00003ff0,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_FT32_20,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 20,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FT32_20",		/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0x000fffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_FT32_17,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 17,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FT32_17",		/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0x0001ffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  HOWTO (R_FT32_18,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 18,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FT32_18",		/* name */
	 FALSE,		/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0x0003ffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

};

/* Map BFD reloc types to FT32 ELF reloc types.  */

struct ft32_reloc_map
{
  bfd_reloc_code_real_type bfd_reloc_val;
  unsigned int ft32_reloc_val;
};

static const struct ft32_reloc_map ft32_reloc_map [] =
{
  { BFD_RELOC_NONE,            R_FT32_NONE },
  { BFD_RELOC_32,              R_FT32_20 },
  { BFD_RELOC_16,              R_FT32_16 },
  { BFD_RELOC_8,               R_FT32_8 },
  { BFD_RELOC_FT32_10,           R_FT32_10 },
  { BFD_RELOC_FT32_20,           R_FT32_20 },
  { BFD_RELOC_FT32_17,           R_FT32_17 },
  { BFD_RELOC_FT32_18,           R_FT32_18 },
};

static reloc_howto_type *
ft32_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			 bfd_reloc_code_real_type code)
{
  unsigned int i;

  for (i = sizeof (ft32_reloc_map) / sizeof (ft32_reloc_map[0]);
       --i;)
    if (ft32_reloc_map [i].bfd_reloc_val == code)
      return & ft32_elf_howto_table [ft32_reloc_map[i].ft32_reloc_val];

  return NULL;
}

static reloc_howto_type *
ft32_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
{
  unsigned int i;

  for (i = 0;
       i < sizeof (ft32_elf_howto_table) / sizeof (ft32_elf_howto_table[0]);
       i++)
    if (ft32_elf_howto_table[i].name != NULL
	&& strcasecmp (ft32_elf_howto_table[i].name, r_name) == 0)
      return &ft32_elf_howto_table[i];

  return NULL;
}

/* Set the howto pointer for an FT32 ELF reloc.  */

static void
ft32_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED,
			  arelent *cache_ptr,
			  Elf_Internal_Rela *dst)
{
  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);
  BFD_ASSERT (r_type < (unsigned int) R_FT32_max);
  cache_ptr->howto = & ft32_elf_howto_table [r_type];
}

/* Relocate an FT32 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 bfd_boolean
ft32_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  = ft32_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 (input_bfd, sec) : name;
	}
      else
	{
	  bfd_boolean 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 = _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 = 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;
}

#define ELF_ARCH		bfd_arch_ft32
#define ELF_MACHINE_CODE	EM_FT32
#define ELF_MAXPAGESIZE		0x1

#define TARGET_LITTLE_SYM       ft32_elf32_vec
#define TARGET_LITTLE_NAME	"elf32-ft32"

#define elf_info_to_howto_rel			NULL
#define elf_info_to_howto			ft32_info_to_howto_rela
#define elf_backend_relocate_section		ft32_elf_relocate_section

#define elf_backend_can_gc_sections		1
#define elf_backend_rela_normal			1

#define bfd_elf32_bfd_reloc_type_lookup		ft32_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup		ft32_reloc_name_lookup

#include "elf32-target.h"