elf32-v850.c

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/* V850-specific support for 32-bit ELF
   Copyright 1996, 1997, 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.  */

/* XXX FIXME: This code is littered with 32bit int, 16bit short, 8bit char
   dependencies.  As is the gas & simulator code or the v850.  */

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/v850.h"

/* sign-extend a 24-bit number */
#define SEXT24(x)	((((x) & 0xffffff) ^ (~ 0x7fffff)) + 0x800000)

static reloc_howto_type *v850_elf_reloc_type_lookup
  PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void v850_elf_info_to_howto_rel
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static void v850_elf_info_to_howto_rela
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static bfd_reloc_status_type v850_elf_reloc
  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static boolean v850_elf_is_local_label_name
  PARAMS ((bfd *, const char *));
static boolean v850_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 v850_elf_perform_relocation
  PARAMS ((bfd *, int, bfd_vma, bfd_byte *));
static boolean v850_elf_check_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *));
static void remember_hi16s_reloc
  PARAMS ((bfd *, bfd_vma, bfd_byte *));
static bfd_byte * find_remembered_hi16s_reloc
  PARAMS ((bfd_vma, boolean *));
static bfd_reloc_status_type v850_elf_final_link_relocate
  PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, bfd_vma,
	   bfd_vma, bfd_vma, struct bfd_link_info *, asection *, int));
static boolean v850_elf_object_p
  PARAMS ((bfd *));
static boolean v850_elf_fake_sections
  PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *));
static void v850_elf_final_write_processing
  PARAMS ((bfd *, boolean));
static boolean v850_elf_set_private_flags
  PARAMS ((bfd *, flagword));
static boolean v850_elf_copy_private_bfd_data
  PARAMS ((bfd *, bfd *));
static boolean v850_elf_merge_private_bfd_data
  PARAMS ((bfd *, bfd *));
static boolean v850_elf_print_private_bfd_data
  PARAMS ((bfd *, PTR));
static boolean v850_elf_section_from_bfd_section
  PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *, int *));
static void v850_elf_symbol_processing
  PARAMS ((bfd *, asymbol *));
static boolean v850_elf_add_symbol_hook
  PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *,
	   const char **, flagword *, asection **, bfd_vma *));
static boolean v850_elf_link_output_symbol_hook
  PARAMS ((bfd *, struct bfd_link_info *, const char *,
	   Elf_Internal_Sym *, asection *));
static boolean v850_elf_section_from_shdr
  PARAMS ((bfd *, Elf_Internal_Shdr *, char *));

/* Note: It is REQUIRED that the 'type' value of each entry in this array
   match the index of the entry in the array.  */
static reloc_howto_type v850_elf_howto_table[] =
{
  /* This reloc does nothing.  */
  HOWTO (R_V850_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_V850_NONE",			/* name */
	 false,				/* partial_inplace */
	 0,				/* src_mask */
	 0,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* A PC relative 9 bit branch.  */
  HOWTO (R_V850_9_PCREL,		/* type */
	 2,				/* rightshift */
	 2,				/* size (0 = byte, 1 = short, 2 = long) */
	 26,				/* bitsize */
	 true,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_9_PCREL",		/* name */
	 false,				/* partial_inplace */
	 0x00ffffff,			/* src_mask */
	 0x00ffffff,			/* dst_mask */
	 true),				/* pcrel_offset */

  /* A PC relative 22 bit branch.  */
  HOWTO (R_V850_22_PCREL,		/* type */
	 2,				/* rightshift */
	 2,				/* size (0 = byte, 1 = short, 2 = long) */
	 22,				/* bitsize */
	 true,				/* pc_relative */
	 7,				/* bitpos */
	 complain_overflow_signed,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_22_PCREL",		/* name */
	 false,				/* partial_inplace */
	 0x07ffff80,			/* src_mask */
	 0x07ffff80,			/* dst_mask */
	 true),				/* pcrel_offset */

  /* High 16 bits of symbol value.  */
  HOWTO (R_V850_HI16_S,			/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_HI16_S",		/* name */
	 false,				/* partial_inplace */
	 0xffff,			/* src_mask */
	 0xffff,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* High 16 bits of symbol value.  */
  HOWTO (R_V850_HI16,			/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_HI16",			/* name */
	 false,				/* partial_inplace */
	 0xffff,			/* src_mask */
	 0xffff,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* Low 16 bits of symbol value.  */
  HOWTO (R_V850_LO16,			/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_LO16",			/* name */
	 false,				/* partial_inplace */
	 0xffff,			/* src_mask */
	 0xffff,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* Simple 32bit reloc.  */
  HOWTO (R_V850_32,			/* type */
	 0,				/* rightshift */
	 2,				/* size (0 = byte, 1 = short, 2 = long) */
	 32,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_32",			/* name */
	 false,				/* partial_inplace */
	 0xffffffff,			/* src_mask */
	 0xffffffff,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* Simple 16bit reloc.  */
  HOWTO (R_V850_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_V850_16",			/* name */
	 false,				/* partial_inplace */
	 0xffff,			/* src_mask */
	 0xffff,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* Simple 8bit reloc.	 */
  HOWTO (R_V850_8,			/* type */
	 0,				/* rightshift */
	 0,				/* size (0 = byte, 1 = short, 2 = long) */
	 8,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,		/* special_function */
	 "R_V850_8",			/* name */
	 false,				/* partial_inplace */
	 0xff,				/* src_mask */
	 0xff,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 16 bit offset from the short data area pointer.  */
  HOWTO (R_V850_SDA_16_16_OFFSET,	/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_SDA_16_16_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0xffff,			/* src_mask */
	 0xffff,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* 15 bit offset from the short data area pointer.  */
  HOWTO (R_V850_SDA_15_16_OFFSET,	/* type */
	 1,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 1,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_SDA_15_16_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0xfffe,			/* src_mask */
	 0xfffe,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* 16 bit offset from the zero data area pointer.  */
  HOWTO (R_V850_ZDA_16_16_OFFSET,	/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_ZDA_16_16_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0xffff,			/* src_mask */
	 0xffff,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* 15 bit offset from the zero data area pointer.  */
  HOWTO (R_V850_ZDA_15_16_OFFSET,	/* type */
	 1,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 1,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_ZDA_15_16_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0xfffe,			/* src_mask */
	 0xfffe,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* 6 bit offset from the tiny data area pointer.  */
  HOWTO (R_V850_TDA_6_8_OFFSET,		/* type */
	 2,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 8,				/* bitsize */
	 false,				/* pc_relative */
	 1,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_TDA_6_8_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0x7e,				/* src_mask */
	 0x7e,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 8 bit offset from the tiny data area pointer.  */
  HOWTO (R_V850_TDA_7_8_OFFSET,		/* type */
	 1,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 8,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_TDA_7_8_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0x7f,				/* src_mask */
	 0x7f,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 7 bit offset from the tiny data area pointer.  */
  HOWTO (R_V850_TDA_7_7_OFFSET,		/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 7,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_TDA_7_7_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0x7f,				/* src_mask */
	 0x7f,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 16 bit offset from the tiny data area pointer!  */
  HOWTO (R_V850_TDA_16_16_OFFSET,	/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_TDA_16_16_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0xffff,			/* src_mask */
	 0xfff,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 5 bit offset from the tiny data area pointer.  */
  HOWTO (R_V850_TDA_4_5_OFFSET,		/* type */
	 1,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 5,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_TDA_4_5_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0x0f,				/* src_mask */
	 0x0f,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 4 bit offset from the tiny data area pointer.  */
  HOWTO (R_V850_TDA_4_4_OFFSET,		/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 4,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_TDA_4_4_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0x0f,				/* src_mask */
	 0x0f,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 16 bit offset from the short data area pointer.  */
  HOWTO (R_V850_SDA_16_16_SPLIT_OFFSET,	/* type */
	 0,				/* rightshift */
	 2,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_SDA_16_16_SPLIT_OFFSET",/* name */
	 false,				/* partial_inplace */
	 0xfffe0020,			/* src_mask */
	 0xfffe0020,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* 16 bit offset from the zero data area pointer.  */
  HOWTO (R_V850_ZDA_16_16_SPLIT_OFFSET,	/* type */
	 0,				/* rightshift */
	 2,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_ZDA_16_16_SPLIT_OFFSET",/* name */
	 false,				/* partial_inplace */
	 0xfffe0020,			/* src_mask */
	 0xfffe0020,			/* dst_mask */
	 false),			/* pcrel_offset */

  /* 6 bit offset from the call table base pointer.  */
  HOWTO (R_V850_CALLT_6_7_OFFSET,	/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 7,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_CALLT_6_7_OFFSET",	/* name */
	 false,				/* partial_inplace */
	 0x3f,				/* src_mask */
	 0x3f,				/* dst_mask */
	 false),			/* pcrel_offset */

  /* 16 bit offset from the call table base pointer.  */
  HOWTO (R_V850_CALLT_16_16_OFFSET,	/* type */
	 0,				/* rightshift */
	 1,				/* size (0 = byte, 1 = short, 2 = long) */
	 16,				/* bitsize */
	 false,				/* pc_relative */
	 0,				/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 v850_elf_reloc,		/* special_function */
	 "R_V850_CALLT_16_16_OFFSET",	/* name */
	 false,				/* partial_inplace */