[deliverable/binutils-gdb.git] / bfd / elf32-arc.c

/* ARC-specific support for 32-bit ELF
   Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007
   Free Software Foundation, Inc.
   Contributed by Doug Evans (dje@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 3 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/arc.h"
#include "libiberty.h"

/* Try to minimize the amount of space occupied by relocation tables
   on the ROM (not that the ROM won't be swamped by other ELF overhead).  */

#define USE_REL	1

static bfd_reloc_status_type
arc_elf_b22_pcrel (bfd * abfd,
		   arelent * reloc_entry,
		   asymbol * symbol,
		   void * data,
		   asection * input_section,
		   bfd * output_bfd,
		   char ** error_message)
{
  /* If linking, back up the final symbol address by the address of the
     reloc.  This cannot be accomplished by setting the pcrel_offset
     field to TRUE, as bfd_install_relocation will detect this and refuse
     to install the offset in the first place, but bfd_perform_relocation
     will still insist on removing it.  */
  if (output_bfd == NULL)
    reloc_entry->addend -= reloc_entry->address;

  /* Fall through to the default elf reloc handler.  */
  return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
				input_section, output_bfd, error_message);
}

static reloc_howto_type elf_arc_howto_table[] =
{
  /* This reloc does nothing.  */
  HOWTO (R_ARC_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_ARC_NONE",		/* Name.  */
	 TRUE,			/* Partial_inplace.  */
	 0,			/* Src_mask.  */
	 0,			/* Dst_mask.  */
	 FALSE),		/* PCrel_offset.  */

  /* A standard 32 bit relocation.  */
  HOWTO (R_ARC_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_ARC_32",		/* Name.  */
	 TRUE,			/* Partial_inplace.  */
	 0xffffffff,		/* Src_mask.  */
	 0xffffffff,		/* Dst_mask.  */
	 FALSE),		/* PCrel_offset.  */

  /* A 26 bit absolute branch, right shifted by 2.  */
  HOWTO (R_ARC_B26,		/* Type.  */
	 2,			/* Rightshift.  */
	 2,			/* Size (0 = byte, 1 = short, 2 = long).  */
	 26,			/* Bitsize.  */
	 FALSE,			/* PC_relative.  */
	 0,			/* Bitpos.  */
	 complain_overflow_bitfield, /* Complain_on_overflow.  */
	 bfd_elf_generic_reloc,	/* Special_function.  */
	 "R_ARC_B26",		/* Name.  */
	 TRUE,			/* Partial_inplace.  */
	 0x00ffffff,		/* Src_mask.  */
	 0x00ffffff,		/* Dst_mask.  */
	 FALSE),		/* PCrel_offset.  */

  /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7.  */
  HOWTO (R_ARC_B22_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.  */
	 arc_elf_b22_pcrel,	/* Special_function.  */
	 "R_ARC_B22_PCREL",	/* Name.  */
	 TRUE,			/* Partial_inplace.  */
	 0x07ffff80,		/* Src_mask.  */
	 0x07ffff80,		/* Dst_mask.  */
	 FALSE),		/* PCrel_offset.  */
};

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

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

static const struct arc_reloc_map arc_reloc_map[] =
{
  { BFD_RELOC_NONE, R_ARC_NONE, },
  { BFD_RELOC_32, R_ARC_32 },
  { BFD_RELOC_CTOR, R_ARC_32 },
  { BFD_RELOC_ARC_B26, R_ARC_B26 },
  { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
};

static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
				 bfd_reloc_code_real_type code)
{
  unsigned int i;

  for (i = ARRAY_SIZE (arc_reloc_map); i--;)
    if (arc_reloc_map[i].bfd_reloc_val == code)
      return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val;

  return NULL;
}

static reloc_howto_type *
bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
				 const char *r_name)
{
  unsigned int i;

  for (i = 0;
       i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]);
       i++)
    if (elf_arc_howto_table[i].name != NULL
	&& strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
      return &elf_arc_howto_table[i];

  return NULL;
}

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

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

  r_type = ELF32_R_TYPE (dst->r_info);
  BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
  cache_ptr->howto = &elf_arc_howto_table[r_type];
}

/* Set the right machine number for an ARC ELF file.  */

static bfd_boolean
arc_elf_object_p (bfd *abfd)
{
  unsigned int mach = bfd_mach_arc_6;

  if (elf_elfheader(abfd)->e_machine == EM_ARC)
    {
      unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;

      switch (arch)
	{
	case E_ARC_MACH_ARC5:
	  mach = bfd_mach_arc_5;
	  break;
	default:
	case E_ARC_MACH_ARC6:
	  mach = bfd_mach_arc_6;
	  break;
	case E_ARC_MACH_ARC7:
	  mach = bfd_mach_arc_7;
	  break;
	case E_ARC_MACH_ARC8:
	  mach = bfd_mach_arc_8;
	  break;
	}
    }
  return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
}

/* The final processing done just before writing out an ARC ELF object file.
   This gets the ARC architecture right based on the machine number.  */

static void
arc_elf_final_write_processing (bfd *abfd,
				bfd_boolean linker ATTRIBUTE_UNUSED)
{
  unsigned long val;

  switch (bfd_get_mach (abfd))
    {
    case bfd_mach_arc_5:
      val = E_ARC_MACH_ARC5;
      break;
    default:
    case bfd_mach_arc_6:
      val = E_ARC_MACH_ARC6;
      break;
    case bfd_mach_arc_7:
      val = E_ARC_MACH_ARC7;
      break;
    case bfd_mach_arc_8:
      val = E_ARC_MACH_ARC8;
      break;
    }
  elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
  elf_elfheader (abfd)->e_flags |= val;
}

#define TARGET_LITTLE_SYM   bfd_elf32_littlearc_vec
#define TARGET_LITTLE_NAME  "elf32-littlearc"
#define TARGET_BIG_SYM      bfd_elf32_bigarc_vec
#define TARGET_BIG_NAME	    "elf32-bigarc"
#define ELF_ARCH            bfd_arch_arc
#define ELF_MACHINE_CODE    EM_ARC
#define ELF_MAXPAGESIZE     0x1000

#define elf_info_to_howto                   0
#define elf_info_to_howto_rel               arc_info_to_howto_rel
#define elf_backend_object_p                arc_elf_object_p
#define elf_backend_final_write_processing  arc_elf_final_write_processing

#include "elf32-target.h"
Commit	Line	Data
	1	/* ARC-specific support for 32-bit ELF
	2	Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007
	3	Free Software Foundation, Inc.
	4	Contributed by Doug Evans (dje@cygnus.com).
	5
	6	This file is part of BFD, the Binary File Descriptor library.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 3 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	21	MA 02110-1301, USA. */
	22
	23	#include "sysdep.h"
	24	#include "bfd.h"
	25	#include "libbfd.h"
	26	#include "elf-bfd.h"
	27	#include "elf/arc.h"
	28	#include "libiberty.h"
	29
	30	/* Try to minimize the amount of space occupied by relocation tables
	31	on the ROM (not that the ROM won't be swamped by other ELF overhead). */
	32
	33	#define USE_REL 1
	34
	35	static bfd_reloc_status_type
	36	arc_elf_b22_pcrel (bfd * abfd,
	37	arelent * reloc_entry,
	38	asymbol * symbol,
	39	void * data,
	40	asection * input_section,
	41	bfd * output_bfd,
	42	char ** error_message)
	43	{
	44	/* If linking, back up the final symbol address by the address of the
	45	reloc. This cannot be accomplished by setting the pcrel_offset
	46	field to TRUE, as bfd_install_relocation will detect this and refuse
	47	to install the offset in the first place, but bfd_perform_relocation
	48	will still insist on removing it. */
	49	if (output_bfd == NULL)
	50	reloc_entry->addend -= reloc_entry->address;
	51
	52	/* Fall through to the default elf reloc handler. */
	53	return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
	54	input_section, output_bfd, error_message);
	55	}
	56
	57	static reloc_howto_type elf_arc_howto_table[] =
	58	{
	59	/* This reloc does nothing. */
	60	HOWTO (R_ARC_NONE, /* Type. */
	61	0, /* Rightshift. */
	62	2, /* Size (0 = byte, 1 = short, 2 = long). */
	63	32, /* Bitsize. */
	64	FALSE, /* PC_relative. */
	65	0, /* Bitpos. */
	66	complain_overflow_bitfield, /* Complain_on_overflow. */
	67	bfd_elf_generic_reloc, /* Special_function. */
	68	"R_ARC_NONE", /* Name. */
	69	TRUE, /* Partial_inplace. */
	70	0, /* Src_mask. */
	71	0, /* Dst_mask. */
	72	FALSE), /* PCrel_offset. */
	73
	74	/* A standard 32 bit relocation. */
	75	HOWTO (R_ARC_32, /* Type. */
	76	0, /* Rightshift. */
	77	2, /* Size (0 = byte, 1 = short, 2 = long). */
	78	32, /* Bitsize. */
	79	FALSE, /* PC_relative. */
	80	0, /* Bitpos. */
	81	complain_overflow_bitfield, /* Complain_on_overflow. */
	82	bfd_elf_generic_reloc, /* Special_function. */
	83	"R_ARC_32", /* Name. */
	84	TRUE, /* Partial_inplace. */
	85	0xffffffff, /* Src_mask. */
	86	0xffffffff, /* Dst_mask. */
	87	FALSE), /* PCrel_offset. */
	88
	89	/* A 26 bit absolute branch, right shifted by 2. */
	90	HOWTO (R_ARC_B26, /* Type. */
	91	2, /* Rightshift. */
	92	2, /* Size (0 = byte, 1 = short, 2 = long). */
	93	26, /* Bitsize. */
	94	FALSE, /* PC_relative. */
	95	0, /* Bitpos. */
	96	complain_overflow_bitfield, /* Complain_on_overflow. */
	97	bfd_elf_generic_reloc, /* Special_function. */
	98	"R_ARC_B26", /* Name. */
	99	TRUE, /* Partial_inplace. */
	100	0x00ffffff, /* Src_mask. */
	101	0x00ffffff, /* Dst_mask. */
	102	FALSE), /* PCrel_offset. */
	103
	104	/* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
	105	HOWTO (R_ARC_B22_PCREL, /* Type. */
	106	2, /* Rightshift. */
	107	2, /* Size (0 = byte, 1 = short, 2 = long). */
	108	22, /* Bitsize. */
	109	TRUE, /* PC_relative. */
	110	7, /* Bitpos. */
	111	complain_overflow_signed, /* Complain_on_overflow. */
	112	arc_elf_b22_pcrel, /* Special_function. */
	113	"R_ARC_B22_PCREL", /* Name. */
	114	TRUE, /* Partial_inplace. */
	115	0x07ffff80, /* Src_mask. */
	116	0x07ffff80, /* Dst_mask. */
	117	FALSE), /* PCrel_offset. */
	118	};
	119
	120	/* Map BFD reloc types to ARC ELF reloc types. */
	121
	122	struct arc_reloc_map
	123	{
	124	bfd_reloc_code_real_type bfd_reloc_val;
	125	unsigned char elf_reloc_val;
	126	};
	127
	128	static const struct arc_reloc_map arc_reloc_map[] =
	129	{
	130	{ BFD_RELOC_NONE, R_ARC_NONE, },
	131	{ BFD_RELOC_32, R_ARC_32 },
	132	{ BFD_RELOC_CTOR, R_ARC_32 },
	133	{ BFD_RELOC_ARC_B26, R_ARC_B26 },
	134	{ BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
	135	};
	136
	137	static reloc_howto_type *
	138	bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
	139	bfd_reloc_code_real_type code)
	140	{
	141	unsigned int i;
	142
	143	for (i = ARRAY_SIZE (arc_reloc_map); i--;)
	144	if (arc_reloc_map[i].bfd_reloc_val == code)
	145	return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val;
	146
	147	return NULL;
	148	}
	149
	150	static reloc_howto_type *
	151	bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
	152	const char *r_name)
	153	{
	154	unsigned int i;
	155
	156	for (i = 0;
	157	i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]);
	158	i++)
	159	if (elf_arc_howto_table[i].name != NULL
	160	&& strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
	161	return &elf_arc_howto_table[i];
	162
	163	return NULL;
	164	}
	165
	166	/* Set the howto pointer for an ARC ELF reloc. */
	167
	168	static void
	169	arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
	170	arelent *cache_ptr,
	171	Elf_Internal_Rela *dst)
	172	{
	173	unsigned int r_type;
	174
	175	r_type = ELF32_R_TYPE (dst->r_info);
	176	BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
	177	cache_ptr->howto = &elf_arc_howto_table[r_type];
	178	}
	179
	180	/* Set the right machine number for an ARC ELF file. */
	181
	182	static bfd_boolean
	183	arc_elf_object_p (bfd *abfd)
	184	{
	185	unsigned int mach = bfd_mach_arc_6;
	186
	187	if (elf_elfheader(abfd)->e_machine == EM_ARC)
	188	{
	189	unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
	190
	191	switch (arch)
	192	{
	193	case E_ARC_MACH_ARC5:
	194	mach = bfd_mach_arc_5;
	195	break;
	196	default:
	197	case E_ARC_MACH_ARC6:
	198	mach = bfd_mach_arc_6;
	199	break;
	200	case E_ARC_MACH_ARC7:
	201	mach = bfd_mach_arc_7;
	202	break;
	203	case E_ARC_MACH_ARC8:
	204	mach = bfd_mach_arc_8;
	205	break;
	206	}
	207	}
	208	return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
	209	}
	210
	211	/* The final processing done just before writing out an ARC ELF object file.
	212	This gets the ARC architecture right based on the machine number. */
	213
	214	static void
	215	arc_elf_final_write_processing (bfd *abfd,
	216	bfd_boolean linker ATTRIBUTE_UNUSED)
	217	{
	218	unsigned long val;
	219
	220	switch (bfd_get_mach (abfd))
	221	{
	222	case bfd_mach_arc_5:
	223	val = E_ARC_MACH_ARC5;
	224	break;
	225	default:
	226	case bfd_mach_arc_6:
	227	val = E_ARC_MACH_ARC6;
	228	break;
	229	case bfd_mach_arc_7:
	230	val = E_ARC_MACH_ARC7;
	231	break;
	232	case bfd_mach_arc_8:
	233	val = E_ARC_MACH_ARC8;
	234	break;
	235	}
	236	elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
	237	elf_elfheader (abfd)->e_flags \|= val;
	238	}
	239
	240	#define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec
	241	#define TARGET_LITTLE_NAME "elf32-littlearc"
	242	#define TARGET_BIG_SYM bfd_elf32_bigarc_vec
	243	#define TARGET_BIG_NAME "elf32-bigarc"
	244	#define ELF_ARCH bfd_arch_arc
	245	#define ELF_MACHINE_CODE EM_ARC
	246	#define ELF_MAXPAGESIZE 0x1000
	247
	248	#define elf_info_to_howto 0
	249	#define elf_info_to_howto_rel arc_info_to_howto_rel
	250	#define elf_backend_object_p arc_elf_object_p
	251	#define elf_backend_final_write_processing arc_elf_final_write_processing
	252
	253	#include "elf32-target.h"