binutils-gdb/bfd/elf32-d30v.c

/* D30V-specific support for 32-bit ELF
   Copyright (C) 1997 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 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));

/* Use REL instead of RELA to save space */
#define USE_REL

enum reloc_type
{
  R_D30V_NONE = 0,
  R_D30V_6,
  R_D30V_15,
  R_D30V_15_PCREL,
  R_D30V_21,
  R_D30V_21_PCREL,
  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 */

  /* An absolute 15 bit relocation, right shifted by 3 */
  HOWTO (R_D30V_15,		/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 15,			/* 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) */
	 15,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_D30V_15_PCREL",	/* 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_PCREL,	/* type */
	 3,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 21,			/* 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) */
	 21,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed, /* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_D30V_21_PCREL",	/* 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 */
	 4,			/* 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 */

};

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;
{
  bfd_vma relocation;
  bfd_vma in1, in2;
  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;

  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 */

  /* 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);
  in2 = bfd_get_32 (abfd, (bfd_byte *) data + addr + 4);

  printf("D30V 32-bit reloc at addr 0x%lx  insn=0x%08x%08x\n",(long)relocation, (int)in1, (int)in2);
  bfd_put_32 (abfd, in1, (bfd_byte *) data + addr);
  bfd_put_32 (abfd, in2, (bfd_byte *) data + addr + 4);
  
  return flag;
}   

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

struct d30v_reloc_map
{
  unsigned char 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_15, R_D30V_15 },
  { BFD_RELOC_D30V_15_PCREL, R_D30V_15_PCREL },
  { BFD_RELOC_D30V_21, R_D30V_21 },
  { BFD_RELOC_D30V_21_PCREL, R_D30V_21_PCREL },
  { 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;
     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.  */

static void
d30v_info_to_howto_rel (abfd, cache_ptr, dst)
     bfd *abfd;
     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];
}

#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	0
#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"