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/* D30V-specific support for 32-bit ELF
   Copyright (C) 1997, 1998, 1999 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"

static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void d30v_info_to_howto_rel
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static void d30v_info_to_howto_rela
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static bfd_reloc_status_type bfd_elf_d30v_reloc PARAMS ((
     bfd *abfd,
     arelent *reloc_entry,
     asymbol *symbol,
     PTR data,
     asection *input_section,
     bfd *output_bfd,
     char **error_message));
static bfd_reloc_status_type bfd_elf_d30v_reloc_21 PARAMS ((
     bfd *abfd,
     arelent *reloc_entry,
     asymbol *symbol,
     PTR data,
     asection *input_section,
     bfd *output_bfd,
     char **error_message));

enum reloc_type
{
  R_D30V_NONE = 0,
  R_D30V_6,
  R_D30V_9_PCREL,
  R_D30V_9_PCREL_R,
  R_D30V_15,
  R_D30V_15_PCREL,
  R_D30V_15_PCREL_R,
  R_D30V_21,
  R_D30V_21_PCREL,
  R_D30V_21_PCREL_R,
  R_D30V_32,
  R_D30V_32_PCREL,
  R_D30V_32_NORMAL,
  R_D30V_max
};

static reloc_howto_type elf_d30v_howto_table[] =
{
  /* This reloc does nothing.  */
  HOWTO (R_D30V_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_D30V_NONE",		/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  /* A 6 bit absolute relocation */
  HOWTO (R_D30V_6,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 6,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_D30V_6",		/* name */
	 false,			/* partial_inplace */
	 0x3f,			/* src_mask */
	 0x3f,			/* dst_mask */
	 false),		/* pcrel_offset */

  /* A relative 9 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_9_PCREL,	/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 6,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_d30v_reloc_21,	/* special_function */
	 "R_D30V_9_PCREL",	/* name */
	 false,			/* partial_inplace */
	 0x3f,			/* src_mask */
	 0x3f,			/* dst_mask */
	 true),			/* pcrel_offset */

  /* A relative 9 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_9_PCREL_R,	/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 6,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_d30v_reloc_21,	/* special_function */
	 "R_D30V_9_PCREL_R",	/* name */
	 false,			/* partial_inplace */
	 0x3f,			/* src_mask */
	 0x3f,			/* dst_mask */
	 true),			/* pcrel_offset */

  /* An absolute 15 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_15,		/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 12,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_D30V_15",		/* name */
	 false,			/* partial_inplace */
	 0xfff,			/* src_mask */
	 0xfff,			/* dst_mask */
	 false),		/* pcrel_offset */

  /* A relative 15 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_15_PCREL,	/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 12,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_d30v_reloc_21,	/* special_function */
	 "R_D30V_15_PCREL",	/* name */
	 false,			/* partial_inplace */
	 0xfff,			/* src_mask */
	 0xfff,			/* dst_mask */
	 true),			/* pcrel_offset */

  /* A relative 15 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_15_PCREL_R,	/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 12,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_d30v_reloc_21,	/* special_function */
	 "R_D30V_15_PCREL_R",	/* name */
	 false,			/* partial_inplace */
	 0xfff,			/* src_mask */
	 0xfff,			/* dst_mask */
	 true),			/* pcrel_offset */

  /* An absolute 21 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_21,		/* type */
	 3,			/* 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_D30V_21",		/* name */
	 false,			/* partial_inplace */
	 0x3ffff,		/* src_mask */
	 0x3ffff,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A relative 21 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_21_PCREL,	/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 18,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_d30v_reloc_21,	/* special_function */
	 "R_D30V_21_PCREL",	/* name */
	 false,			/* partial_inplace */
	 0x3ffff,		/* src_mask */
	 0x3ffff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* A relative 21 bit relocation, right shifted by 3, in the Right container */
  HOWTO (R_D30V_21_PCREL_R,	/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 18,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_d30v_reloc_21,	/* special_function */
	 "R_D30V_21_PCREL_R",	/* name */
	 false,			/* partial_inplace */
	 0x3ffff,		/* src_mask */
	 0x3ffff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* A D30V 32 bit absolute relocation */
  HOWTO (R_D30V_32,		/* type */
	 0,			/* rightshift */
	 4,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 bfd_elf_d30v_reloc,	/* special_function */
	 "R_D30V_32",		/* name */
	 false,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* A relative 32 bit relocation */
  HOWTO (R_D30V_32_PCREL,	/* type */
	 0,			/* rightshift */
	 4,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_d30v_reloc,	/* special_function */
	 "R_D30V_32_PCREL",	/* name */
	 false,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* A regular 32 bit absolute relocation */
  HOWTO (R_D30V_32_NORMAL,		/* 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_D30V_32_NORMAL",		/* name */
	 false,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 false),		/* pcrel_offset */

};

#define MIN32 (long long)0xffffffff80000000LL
#define MAX32 0x7fffffffLL

static bfd_reloc_status_type
bfd_elf_d30v_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;
{
  long long relocation;
  bfd_vma in1, in2, num;
  bfd_vma tmp_addr = 0;
  bfd_reloc_status_type r;
  asection *reloc_target_output_section;
  bfd_size_type addr = reloc_entry->address;
  bfd_reloc_status_type flag = bfd_reloc_ok;
  bfd_vma output_base = 0;
  reloc_howto_type *howto = reloc_entry->howto;
  int make_absolute = 0;

  r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
                             input_section, output_bfd, error_message);
  if (r != bfd_reloc_continue)
    return r; 

  /* a hacked-up version of bfd_perform_reloc() follows */
 if (bfd_is_und_section (symbol->section)
      && (symbol->flags & BSF_WEAK) == 0
      && output_bfd == (bfd *) NULL)
    flag = bfd_reloc_undefined;

  /* Is the address of the relocation really within the section?  */
  if (reloc_entry->address > input_section->_cooked_size)
    return bfd_reloc_outofrange;

  /* Work out which section the relocation is targetted at and the
     initial relocation command value.  */

  /* Get symbol value.  (Common symbols are special.)  */
  if (bfd_is_com_section (symbol->section))
    relocation = 0;
  else
    relocation = symbol->value;

  reloc_target_output_section = symbol->section->output_section;

  /* Convert input-section-relative symbol value to absolute.  */
  if (output_bfd)
    output_base = 0;
  else
    output_base = reloc_target_output_section->vma;

  relocation += output_base + symbol->section->output_offset;

  /* Add in supplied addend.  */
  relocation += reloc_entry->addend;

  /* Here the variable relocation holds the final address of the
     symbol we are relocating against, plus any addend.  */

  if (howto->pc_relative == true)
    {
      tmp_addr = input_section->output_section->vma + input_section->output_offset 
	+ reloc_entry->address;
      relocation -= tmp_addr;
    }
  
  if (output_bfd != (bfd *) NULL)
    {
      /* This is a partial relocation, and we want to apply the relocation
	 to the reloc entry rather than the raw data. Modify the reloc
	 inplace to reflect what we now know.  */
      reloc_entry->addend = relocation;
      reloc_entry->address += input_section->output_offset;
      return flag;
    }
  else
    reloc_entry->addend = 0;
  
  in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);
  in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4);

  /* extract the addend */
  num = ((in2 & 0x3FFFF)
	 | ((in2 & 0xFF00000) >> 2)
	 | ((in1 & 0x3F) << 26));
  in1 &= 0xFFFFFFC0;
  in2 = 0x80000000;
  
  relocation += num;

  if (howto->pc_relative == true && howto->bitsize == 32)
    {
      /* the D30V has a PC that doesn't wrap and PC-relative jumps */
      /* are signed, so a PC-relative jump can'tbe more than +/- 2^31 byrtes */
      /* if one exceeds this, change it to an absolute jump */
      if (relocation > MAX32)
	{
	  relocation = (relocation + tmp_addr) & 0xffffffff;
	  make_absolute = 1;
	}
      else if (relocation < MIN32)
	{
	  relocation = (relocation + tmp_addr) & 0xffffffff;
	  make_absolute = 1;
	}
    }
  
  in1 |= (relocation >> 26) & 0x3F;	/* top 6 bits */
  in2 |= ((relocation & 0x03FC0000) << 2);  /* next 8 bits */ 
  in2 |= relocation & 0x0003FFFF;		/* bottom 18 bits */
  
  /* change a PC-relative instruction to its absolute equivalent */
  /* with this simple hack */
  if (make_absolute)
    in1 |= 0x00100000;

  bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
  bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4);
  
  return flag;
}   


static bfd_reloc_status_type
bfd_elf_d30v_reloc_21 (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;
{
  bfd_vma relocation;
  bfd_vma in1, num;
  bfd_reloc_status_type r;
  asection *reloc_target_output_section;
  bfd_size_type addr = reloc_entry->address;
  bfd_reloc_status_type flag = bfd_reloc_ok;
  bfd_vma output_base = 0;
  reloc_howto_type *howto = reloc_entry->howto;
  int mask, max;

  r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
                             input_section, output_bfd, error_message);
  if (r != bfd_reloc_continue)
    return r; 

  /* a hacked-up version of bfd_perform_reloc() follows */
 if (bfd_is_und_section (symbol->section)
      && (symbol->flags & BSF_WEAK) == 0
      && output_bfd == (bfd *) NULL)
    flag = bfd_reloc_undefined;

  /* Is the address of the relocation really within the section?  */
  if (reloc_entry->address > input_section->_cooked_size)
    return bfd_reloc_outofrange;

  /* Work out which section the relocation is targetted at and the
     initial relocation command value.  */

  /* Get symbol value.  (Common symbols are special.)  */
  if (bfd_is_com_section (symbol->section))
    relocation = 0;
  else
    relocation = symbol->value;

  reloc_target_output_section = symbol->section->output_section;

  /* Convert input-section-relative symbol value to absolute.  */
  if (output_bfd)
    output_base = 0;
  else
    output_base = reloc_target_output_section->vma;

  relocation += output_base + symbol->section->output_offset;

  /* Add in supplied addend.  */
  relocation += reloc_entry->addend;

  /* Here the variable relocation holds the final address of the
     symbol we are relocating against, plus any addend.  */

  if (howto->pc_relative == true)
    {
      relocation -= input_section->output_section->vma + input_section->output_offset;
      if (howto->pcrel_offset == true)
	relocation -= reloc_entry->address;
    }

  if (output_bfd != (bfd *) NULL)
    {
      /* This is a partial relocation, and we want to apply the relocation
	 to the reloc entry rather than the raw data. Modify the reloc
	 inplace to reflect what we now know.  */
      reloc_entry->addend = relocation;
      reloc_entry->address += input_section->output_offset;
      return flag;
    }
  else
    reloc_entry->addend = 0;
  
  in1 = bfd_get_32 (abfd, (bfd_byte *) data + addr);

  mask =  (1 << howto->bitsize) - 1;
  if (howto->bitsize == 6)
    mask <<= 12;
  max = (1 << (howto->bitsize + 2)) - 1;

  /* extract the addend */
  num = in1 & mask;  /* 18 bits */
  if (howto->bitsize == 6)
    num >>= 12;
  num <<= 3; /* shift left 3 */
  in1 &= ~mask;  /* mask out addend */

  relocation += num;
  if (howto->type == R_D30V_21_PCREL_R || howto->type == R_D30V_15_PCREL_R ||
      howto->type == R_D30V_9_PCREL_R )
    {
      relocation += 4;
    }

  if ((int)relocation < 0 )
    {
      if (~(int)relocation > max)
	flag = bfd_reloc_overflow;
    }
  else
    {
      if ((int)relocation > max)
	flag = bfd_reloc_overflow;
    }
  relocation >>= 3; 
  if (howto->bitsize == 6)
    in1 |= ((relocation & (mask >> 12)) << 12);
  else
    in1 |= relocation & mask;

  bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
  
  return flag;
}   

/* Map BFD reloc types to D30V ELF reloc types.  */

struct d30v_reloc_map
{
  bfd_reloc_code_real_type bfd_reloc_val;
  unsigned char elf_reloc_val;
};


static const struct d30v_reloc_map d30v_reloc_map[] =
{
  { BFD_RELOC_NONE, R_D30V_NONE, },
  { BFD_RELOC_D30V_6, R_D30V_6 },
  { BFD_RELOC_D30V_9_PCREL, R_D30V_9_PCREL },
  { BFD_RELOC_D30V_9_PCREL_R, R_D30V_9_PCREL_R },
  { BFD_RELOC_D30V_15, R_D30V_15 },
  { BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL },
  { BFD_RELOC_D30V_15_PCREL_R, R_D30V_15_PCREL_R },
  { BFD_RELOC_D30V_21, R_D30V_21 },
  { BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL },
  { BFD_RELOC_D30V_21_PCREL_R, R_D30V_21_PCREL_R },
  { BFD_RELOC_D30V_32, R_D30V_32 },
  { BFD_RELOC_D30V_32_PCREL, R_D30V_32_PCREL },
  { BFD_RELOC_32, R_D30V_32_NORMAL },
};

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 (d30v_reloc_map) / sizeof (struct d30v_reloc_map);
       i++)
    {
      if (d30v_reloc_map[i].bfd_reloc_val == code)
	return &elf_d30v_howto_table[d30v_reloc_map[i].elf_reloc_val];
    }

  return NULL;
}

/* Set the howto pointer for an D30V ELF reloc (type REL).  */

static void
d30v_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_D30V_max);
  cache_ptr->howto = &elf_d30v_howto_table[r_type];
}

/* Set the howto pointer for an D30V ELF reloc (type RELA).  */

static void
d30v_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_D30V_max);
  cache_ptr->howto = &elf_d30v_howto_table[r_type];
}

#define ELF_ARCH		bfd_arch_d30v
#define ELF_MACHINE_CODE	EM_CYGNUS_D30V
#define ELF_MAXPAGESIZE		0x1000

#define TARGET_BIG_SYM          bfd_elf32_d30v_vec
#define TARGET_BIG_NAME		"elf32-d30v"

#define elf_info_to_howto	d30v_info_to_howto_rela
#define elf_info_to_howto_rel	d30v_info_to_howto_rel
#define elf_backend_object_p	0
#define elf_backend_final_write_processing	0

#include "elf32-target.h"