[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 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "bfd.h"
#include "sysdep.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
252b5132	1	/* ARC-specific support for 32-bit ELF
157090f7	2	Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007
acf8aed4	3	Free Software Foundation, Inc.
252b5132 RH	4	Contributed by Doug Evans (dje@cygnus.com).
252b5132 RH	5
0d2bcfaf	6	This file is part of BFD, the Binary File Descriptor library.
252b5132	7
0d2bcfaf NC	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 2 of the License, or
	11	(at your option) any later version.
252b5132	12
0d2bcfaf NC	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.
252b5132	17
0d2bcfaf NC	18	You should have received a copy of the GNU General Public License
0d2bcfaf NC	19	along with this program; if not, write to the Free Software
47b0e7ad NC	20	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
47b0e7ad NC	21	MA 02110-1301, USA. */
252b5132 RH	22
	23	#include "bfd.h"
	24	#include "sysdep.h"
	25	#include "libbfd.h"
	26	#include "elf-bfd.h"
	27	#include "elf/arc.h"
ea04a8f6	28	#include "libiberty.h"
252b5132	29
252b5132 RH	30	/* Try to minimize the amount of space occupied by relocation tables
252b5132 RH	31	on the ROM (not that the ROM won't be swamped by other ELF overhead). */
0d2bcfaf	32
acf8aed4	33	#define USE_REL 1
252b5132	34
47b0e7ad NC	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
252b5132 RH	57	static reloc_howto_type elf_arc_howto_table[] =
	58	{
	59	/* This reloc does nothing. */
47b0e7ad NC	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. */
252b5132 RH	73
252b5132 RH	74	/* A standard 32 bit relocation. */
47b0e7ad NC	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. */
252b5132 RH	88
252b5132 RH	89	/* A 26 bit absolute branch, right shifted by 2. */
47b0e7ad NC	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. */
252b5132 RH	103
252b5132 RH	104	/* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
47b0e7ad NC	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. */
252b5132 RH	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 *
47b0e7ad NC	138	bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
47b0e7ad NC	139	bfd_reloc_code_real_type code)
252b5132 RH	140	{
	141	unsigned int i;
	142
ea04a8f6 NC	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
252b5132 RH	147	return NULL;
	148	}
	149
157090f7 AM	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
252b5132 RH	166	/* Set the howto pointer for an ARC ELF reloc. */
	167
	168	static void
47b0e7ad NC	169	arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
	170	arelent *cache_ptr,
	171	Elf_Internal_Rela *dst)
252b5132 RH	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
b34976b6	182	static bfd_boolean
47b0e7ad	183	arc_elf_object_p (bfd *abfd)
252b5132	184	{
dc810e39	185	unsigned int mach = bfd_mach_arc_6;
252b5132	186
0d2bcfaf	187	if (elf_elfheader(abfd)->e_machine == EM_ARC)
252b5132	188	{
0d2bcfaf NC	189	unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
	190
	191	switch (arch)
	192	{
0d2bcfaf NC	193	case E_ARC_MACH_ARC5:
	194	mach = bfd_mach_arc_5;
	195	break;
bcee8eb8	196	default:
0d2bcfaf NC	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	}
252b5132	207	}
0d2bcfaf	208	return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
252b5132 RH	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
47b0e7ad NC	215	arc_elf_final_write_processing (bfd *abfd,
47b0e7ad NC	216	bfd_boolean linker ATTRIBUTE_UNUSED)
252b5132	217	{
252b5132 RH	218	unsigned long val;
252b5132 RH	219
0d2bcfaf	220	switch (bfd_get_mach (abfd))
252b5132	221	{
0d2bcfaf NC	222	case bfd_mach_arc_5:
	223	val = E_ARC_MACH_ARC5;
	224	break;
bcee8eb8	225	default:
0d2bcfaf NC	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;
252b5132	235	}
252b5132 RH	236	elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
	237	elf_elfheader (abfd)->e_flags \|= val;
	238	}
	239
47b0e7ad NC	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
252b5132 RH	252
252b5132 RH	253	#include "elf32-target.h"