elf32-fr30.c

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/* FR30-specific support for 32-bit ELF.
   Copyright 1998, 1999, 2000, 2001 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 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/fr30.h"

/* Forward declarations.  */
static bfd_reloc_status_type fr30_elf_i20_reloc
  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static bfd_reloc_status_type fr30_elf_i32_reloc
  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static reloc_howto_type * fr30_reloc_type_lookup
  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void fr30_info_to_howto_rela
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static boolean fr30_elf_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static bfd_reloc_status_type fr30_final_link_relocate
  PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma));
static boolean fr30_elf_gc_sweep_hook
  PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *));
static asection * fr30_elf_gc_mark_hook
  PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *));

static reloc_howto_type fr30_elf_howto_table [] =
{
  /* This reloc does nothing.  */
  HOWTO (R_FR30_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_FR30_NONE",		/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  /* An 8 bit absolute relocation.  */
  HOWTO (R_FR30_8,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 false,			/* pc_relative */
	 4,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FR30_8",		/* name */
	 true,			/* partial_inplace */
	 0x0000,		/* src_mask */
	 0x0ff0,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A 20 bit absolute relocation.  */
  HOWTO (R_FR30_20,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 20,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 fr30_elf_i20_reloc,	/* special_function */
	 "R_FR30_20",		/* name */
	 true,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0x00f0ffff,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A 32 bit absolute relocation.  */
  HOWTO (R_FR30_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_FR30_32",		/* name */
	 true,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A 32 bit into 48 bits absolute relocation.  */
  HOWTO (R_FR30_48,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 fr30_elf_i32_reloc,	/* special_function */
	 "R_FR30_48",		/* name */
	 true,			/* partial_inplace */
	 0x00000000,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A 6 bit absolute relocation.  */
  HOWTO (R_FR30_6_IN_4,		/* type */
	 2,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 6,			/* bitsize */
	 false,			/* pc_relative */
	 4,			/* bitpos */
	 complain_overflow_unsigned, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_FR30_6_IN_4",	/* name */
	 true,			/* partial_inplace */
	 0x0000,		/* src_mask */
	 0x00f0,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* An 8 bit absolute relocation.  */
  HOWTO (R_FR30_8_IN_8,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 false,			/* pc_relative */
	 4,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,/* special_function */
	 "R_FR30_8_IN_8",	/* name */
	 true,			/* partial_inplace */
	 0x0000,		/* src_mask */
	 0x0ff0,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A 9 bit absolute relocation.  */
  HOWTO (R_FR30_9_IN_8,		/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 9,			/* bitsize */
	 false,			/* pc_relative */
	 4,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,/* special_function */
	 "R_FR30_9_IN_8",	/* name */
	 true,			/* partial_inplace */
	 0x0000,		/* src_mask */
	 0x0ff0,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A 10 bit absolute relocation.  */
  HOWTO (R_FR30_10_IN_8,	/* type */
	 2,			/* 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_FR30_10_IN_8",	/* name */
	 true,			/* partial_inplace */
	 0x0000,		/* src_mask */
	 0x0ff0,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A PC relative 9 bit relocation, right shifted by 1.  */
  HOWTO (R_FR30_9_PCREL,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 9,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc, /* special_function */
	 "R_FR30_9_PCREL",	/* name */
	 false,			/* partial_inplace */
	 0x0000,		/* src_mask */
	 0x00ff,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A PC relative 12 bit relocation, right shifted by 1.  */
  HOWTO (R_FR30_12_PCREL,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 12,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc, /* special_function */
	 "R_FR30_12_PCREL",	/* name */
	 false,			/* partial_inplace */
	 0x0000,		/* src_mask */
	 0x07ff,		/* dst_mask */
	 false),		/* pcrel_offset */
  /* GNU extension to record C++ vtable hierarchy */
  HOWTO (R_FR30_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_FR30_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_FR30_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_FR30_GNU_VTENTRY",   /* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         false),                /* pcrel_offset */
};

/* Utility to actually perform an R_FR30_20 reloc.  */

static bfd_reloc_status_type
fr30_elf_i20_reloc (abfd, reloc_entry, symbol, data,
		    input_section, output_bfd, error_message)
     bfd *      abfd;
     arelent *  reloc_entry;
     asymbol *  symbol;
     PTR        data;
     asection * input_section;
     bfd *      output_bfd;
     char **    error_message ATTRIBUTE_UNUSED;
{
  bfd_vma       relocation;
  unsigned long x;

  /* This part is from bfd_elf_generic_reloc.  */
  if (output_bfd != (bfd *) NULL
      && (symbol->flags & BSF_SECTION_SYM) == 0
      && (! reloc_entry->howto->partial_inplace
	  || reloc_entry->addend == 0))
    {
      reloc_entry->address += input_section->output_offset;
      return bfd_reloc_ok;
    }

  if (output_bfd != NULL)
    /* FIXME: See bfd_perform_relocation.  Is this right?  */
    return bfd_reloc_ok;

  relocation =
    symbol->value
    + symbol->section->output_section->vma
    + symbol->section->output_offset
    + reloc_entry->addend;

  if (relocation > (((bfd_vma) 1 << 20) - 1))
    return bfd_reloc_overflow;

  x = bfd_get_32 (abfd, (char *) data + reloc_entry->address);
  x = (x & 0xff0f0000) | (relocation & 0x0000ffff) | ((relocation & 0x000f0000) << 4);
  bfd_put_32 (abfd, x, (char *) data + reloc_entry->address);

  return bfd_reloc_ok;
}

/* Utility to actually perform a R_FR30_48 reloc.  */

static bfd_reloc_status_type
fr30_elf_i32_reloc (abfd, reloc_entry, symbol, data,
		    input_section, output_bfd, error_message)
     bfd *      abfd;
     arelent *  reloc_entry;
     asymbol *  symbol;
     PTR        data;
     asection * input_section;
     bfd *      output_bfd;
     char **    error_message ATTRIBUTE_UNUSED;
{
  bfd_vma       relocation;

  /* This part is from bfd_elf_generic_reloc.  */
  if (output_bfd != (bfd *) NULL
      && (symbol->flags & BSF_SECTION_SYM) == 0
      && (! reloc_entry->howto->partial_inplace
	  || reloc_entry->addend == 0))
    {
      reloc_entry->address += input_section->output_offset;
      return bfd_reloc_ok;
    }

  if (output_bfd != NULL)
    /* FIXME: See bfd_perform_relocation.  Is this right?  */
    return bfd_reloc_ok;

  relocation =
    symbol->value
    + symbol->section->output_section->vma
    + symbol->section->output_offset
    + reloc_entry->addend;

  bfd_put_32 (abfd, relocation, (char *) data + reloc_entry->address + 2);

  return bfd_reloc_ok;
}

/* Map BFD reloc types to FR30 ELF reloc types.  */

struct fr30_reloc_map
{
  bfd_reloc_code_real_type bfd_reloc_val;
  unsigned int fr30_reloc_val;
};

static const struct fr30_reloc_map fr30_reloc_map [] =
{
  { BFD_RELOC_NONE,           R_FR30_NONE },
  { BFD_RELOC_8,              R_FR30_8 },
  { BFD_RELOC_FR30_20,        R_FR30_20 },
  { BFD_RELOC_32,             R_FR30_32 },
  { BFD_RELOC_FR30_48,        R_FR30_48 },
  { BFD_RELOC_FR30_6_IN_4,    R_FR30_6_IN_4 },
  { BFD_RELOC_FR30_8_IN_8,    R_FR30_8_IN_8 },
  { BFD_RELOC_FR30_9_IN_8,    R_FR30_9_IN_8 },
  { BFD_RELOC_FR30_10_IN_8,   R_FR30_10_IN_8 },
  { BFD_RELOC_FR30_9_PCREL,   R_FR30_9_PCREL },
  { BFD_RELOC_FR30_12_PCREL,  R_FR30_12_PCREL },
  { BFD_RELOC_VTABLE_INHERIT, R_FR30_GNU_VTINHERIT },
  { BFD_RELOC_VTABLE_ENTRY,   R_FR30_GNU_VTENTRY },
};

static reloc_howto_type *
fr30_reloc_type_lookup (abfd, code)
     bfd * abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  unsigned int i;

  for (i = sizeof (fr30_reloc_map) / sizeof (fr30_reloc_map[0]);
       --i;)
    if (fr30_reloc_map [i].bfd_reloc_val == code)
      return & fr30_elf_howto_table [fr30_reloc_map[i].fr30_reloc_val];

  return NULL;
}

/* Set the howto pointer for an FR30 ELF reloc.  */

static void
fr30_info_to_howto_rela (abfd, cache_ptr, dst)
     bfd * abfd ATTRIBUTE_UNUSED;
     arelent * cache_ptr;
     Elf32_Internal_Rela * dst;
{
  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);
  BFD_ASSERT (r_type < (unsigned int) R_FR30_max);
  cache_ptr->howto = & fr30_elf_howto_table [r_type];
}

/* 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
fr30_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation)
     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;
  bfd_vma               x;
  bfd_signed_vma	srel;

  switch (howto->type)
    {
    case R_FR30_20:
      contents   += rel->r_offset;
      relocation += rel->r_addend;

      if (relocation > ((1 << 20) - 1))
	return bfd_reloc_overflow;

      x = bfd_get_32 (input_bfd, contents);