binutils-gdb/bfd/elfarm-oabi.c

/* 32-bit ELF support for ARM old abi option.
   Copyright 1999 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 "elf/arm-oabi.h"
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"

#ifndef NUM_ELEM
#define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
#endif

#define USE_RELA

#define TARGET_LITTLE_SYM               bfd_elf32_littlearm_oabi_vec
#define TARGET_LITTLE_NAME              "elf32-littlearm-oabi"
#define TARGET_BIG_SYM                  bfd_elf32_bigarm_oabi_vec
#define TARGET_BIG_NAME                 "elf32-bigarm-oabi"

#define elf_info_to_howto               elf32_arm_info_to_howto
#define elf_info_to_howto_rel           0

#define ARM_ELF_ABI_VERSION		0
#define ARM_ELF_OS_ABI_VERSION		0

static reloc_howto_type elf32_arm_howto_table[] =
{
  /* No relocation */
  HOWTO (R_ARM_NONE,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_NONE",		/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  HOWTO (R_ARM_PC24,		/* type */
	 2,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 24,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_PC24",		/* name */
	 false,			/* partial_inplace */
	 0x00ffffff,		/* src_mask */
	 0x00ffffff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* 32 bit absolute */
  HOWTO (R_ARM_ABS32,		/* 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_ARM_ABS32",		/* name */
	 false,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 false),		/* pcrel_offset */

  /* standard 32bit pc-relative reloc */
  HOWTO (R_ARM_REL32,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_REL32",		/* name */
	 false,			/* partial_inplace */
	 0xffffffff,		/* src_mask */
	 0xffffffff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* 8 bit absolute */
  HOWTO (R_ARM_ABS8,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_ABS8",		/* name */
	 false,			/* partial_inplace */
	 0x000000ff,		/* src_mask */
	 0x000000ff,		/* dst_mask */
	 false),		/* pcrel_offset */

   /* 16 bit absolute */
  HOWTO (R_ARM_ABS16,		/* 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_ARM_ABS16",		/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  /* 12 bit absolute */
  HOWTO (R_ARM_ABS12,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 12,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_ABS12",		/* name */
	 false,			/* partial_inplace */
	 0x000008ff,		/* src_mask */
	 0x000008ff,		/* dst_mask */
	 false),		/* pcrel_offset */

  HOWTO (R_ARM_THM_ABS5,	/* type */
	 6,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 5,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_THM_ABS5",	/* name */
	 false,			/* partial_inplace */
	 0x000007e0,		/* src_mask */
	 0x000007e0,		/* dst_mask */
	 false),		/* pcrel_offset */

  HOWTO (R_ARM_THM_PC22,	/* type */
	 1,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 23,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_THM_PC22",	/* name */
	 false,			/* partial_inplace */
	 0x07ff07ff,		/* src_mask */
	 0x07ff07ff,		/* dst_mask */
	 true),			/* pcrel_offset */

  HOWTO (R_ARM_SBREL32,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_SBREL32",	/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  HOWTO (R_ARM_AMP_VCALL9,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_AMP_VCALL9",	/* name */
	 false,			/* partial_inplace */
	 0x000000ff,		/* src_mask */
	 0x000000ff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* 12 bit pc relative */
  HOWTO (R_ARM_THM_PC11,	/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 11,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_THM_PC11",	/* name */
	 false,			/* partial_inplace */
	 0x000007ff,		/* src_mask */
	 0x000007ff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* 12 bit pc relative */
  HOWTO (R_ARM_THM_PC9,		/* type */
	 1,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 true,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_THM_PC9",	/* name */
	 false,			/* partial_inplace */
	 0x000000ff,		/* src_mask */
	 0x000000ff,		/* dst_mask */
	 true),			/* pcrel_offset */

  /* GNU extension to record C++ vtable hierarchy */
  HOWTO (R_ARM_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_ARM_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_ARM_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_ARM_GNU_VTENTRY",   /* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         false),                /* pcrel_offset */

  /* XXX - gap in index numbering here.  */
  
  HOWTO (R_ARM_PLT32,		/* type */
         2,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         26,                    /* bitsize */
         true,			/* pc_relative */
         0,                     /* bitpos */
         complain_overflow_bitfield,/* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_ARM_PLT32",		/* name */
         true,			/* partial_inplace */
         0x00ffffff,		/* src_mask */
         0x00ffffff,		/* dst_mask */
         true),			/* pcrel_offset */
  
  /* XXX - gap in index numbering here.  */

  HOWTO (R_ARM_RREL32,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_RREL32",	/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  HOWTO (R_ARM_RABS32,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_RABS32",	/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  HOWTO (R_ARM_RPC24,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_RPC24",		/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false),		/* pcrel_offset */

  HOWTO (R_ARM_RBASE,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 false,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARM_RBASE",		/* name */
	 false,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 false)			/* pcrel_offset */
};

/* Locate a reloc in the howto table.  This function must be used
   when the entry number is is > R_ARM_GNU_VTINHERIT.  */
static reloc_howto_type *
find_howto (r_type)
     unsigned int r_type;
{
  int i;
  
  for (i = NUM_ELEM (elf32_arm_howto_table); i--;)
    if (elf32_arm_howto_table [i].type == r_type)
      return elf32_arm_howto_table + i;

  return NULL;
}

static void
elf32_arm_info_to_howto (abfd, bfd_reloc, elf_reloc)
     bfd *abfd;
     arelent *bfd_reloc;
     Elf32_Internal_Rela *elf_reloc;
{
  unsigned int r_type;

  r_type = ELF32_R_TYPE (elf_reloc->r_info);

  if (r_type <= R_ARM_GNU_VTINHERIT)
    bfd_reloc->howto = & elf32_arm_howto_table[r_type];
  else
    bfd_reloc->howto = find_howto (r_type);
}

struct elf32_arm_reloc_map
  {
    bfd_reloc_code_real_type bfd_reloc_val;
    unsigned char elf_reloc_val;
  };

static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
{
  {BFD_RELOC_NONE,                 R_ARM_NONE },
  {BFD_RELOC_ARM_PCREL_BRANCH,     R_ARM_PC24 },
  {BFD_RELOC_32,                   R_ARM_ABS32 },
  {BFD_RELOC_32_PCREL,             R_ARM_REL32 },
  {BFD_RELOC_8,                    R_ARM_ABS8 },
  {BFD_RELOC_16,                   R_ARM_ABS16 },
  {BFD_RELOC_ARM_OFFSET_IMM,       R_ARM_ABS12 },
  {BFD_RELOC_ARM_THUMB_OFFSET,     R_ARM_THM_ABS5 },
  {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22 },
  {BFD_RELOC_NONE,                 R_ARM_SBREL32 },
  {BFD_RELOC_NONE,                 R_ARM_AMP_VCALL9 },
  {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_PC11 },
  {BFD_RELOC_THUMB_PCREL_BRANCH9,  R_ARM_THM_PC9 },  
  {BFD_RELOC_VTABLE_INHERIT,       R_ARM_GNU_VTINHERIT },
  {BFD_RELOC_VTABLE_ENTRY,         R_ARM_GNU_VTENTRY }
};

static reloc_howto_type *
elf32_arm_reloc_type_lookup (abfd, code)
     bfd * abfd;
     bfd_reloc_code_real_type code;
{
  unsigned int i;

  for (i = NUM_ELEM (elf32_arm_reloc_map); i--;)
    if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
      return & elf32_arm_howto_table [elf32_arm_reloc_map[i].elf_reloc_val];

  if (code == BFD_RELOC_ARM_PLT32)
    return find_howto (R_ARM_PLT32);
  
  return NULL;
}

#define bfd_elf32_arm_allocate_interworking_sections \
	bfd_elf32_arm_oabi_allocate_interworking_sections
#define bfd_elf32_arm_get_bfd_for_interworking \
	bfd_elf32_arm_oabi_get_bfd_for_interworking
#define bfd_elf32_arm_process_before_allocation \
	bfd_elf32_arm_oabi_process_before_allocation

#include "elf32-arm.h"