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

/* ARC-specific support for 32-bit ELF
   Copyright (C) 1994-2014 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   arc_elf32_le_vec
#define TARGET_LITTLE_NAME  "elf32-littlearc"
#define TARGET_BIG_SYM      arc_elf32_be_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
4b95cf5c	2	Copyright (C) 1994-2014 Free Software Foundation, Inc.
252b5132 RH	3	Contributed by Doug Evans (dje@cygnus.com).
252b5132 RH	4
0d2bcfaf	5	This file is part of BFD, the Binary File Descriptor library.
252b5132	6
0d2bcfaf NC	7	This program is free software; you can redistribute it and/or modify
0d2bcfaf NC	8	it under the terms of the GNU General Public License as published by
cd123cb7	9	the Free Software Foundation; either version 3 of the License, or
0d2bcfaf	10	(at your option) any later version.
252b5132	11
0d2bcfaf NC	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
252b5132	16
0d2bcfaf NC	17	You should have received a copy of the GNU General Public License
0d2bcfaf NC	18	along with this program; if not, write to the Free Software
47b0e7ad NC	19	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
47b0e7ad NC	20	MA 02110-1301, USA. */
252b5132	21
252b5132	22	#include "sysdep.h"
3db64b00	23	#include "bfd.h"
252b5132 RH	24	#include "libbfd.h"
	25	#include "elf-bfd.h"
	26	#include "elf/arc.h"
ea04a8f6	27	#include "libiberty.h"
252b5132	28
252b5132 RH	29	/* Try to minimize the amount of space occupied by relocation tables
252b5132 RH	30	on the ROM (not that the ROM won't be swamped by other ELF overhead). */
0d2bcfaf	31
acf8aed4	32	#define USE_REL 1
252b5132	33
47b0e7ad NC	34	static bfd_reloc_status_type
	35	arc_elf_b22_pcrel (bfd * abfd,
	36	arelent * reloc_entry,
	37	asymbol * symbol,
	38	void * data,
	39	asection * input_section,
	40	bfd * output_bfd,
	41	char ** error_message)
	42	{
	43	/* If linking, back up the final symbol address by the address of the
	44	reloc. This cannot be accomplished by setting the pcrel_offset
	45	field to TRUE, as bfd_install_relocation will detect this and refuse
	46	to install the offset in the first place, but bfd_perform_relocation
	47	will still insist on removing it. */
	48	if (output_bfd == NULL)
	49	reloc_entry->addend -= reloc_entry->address;
	50
	51	/* Fall through to the default elf reloc handler. */
	52	return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
	53	input_section, output_bfd, error_message);
	54	}
	55
252b5132 RH	56	static reloc_howto_type elf_arc_howto_table[] =
	57	{
	58	/* This reloc does nothing. */
47b0e7ad NC	59	HOWTO (R_ARC_NONE, /* Type. */
	60	0, /* Rightshift. */
	61	2, /* Size (0 = byte, 1 = short, 2 = long). */
	62	32, /* Bitsize. */
	63	FALSE, /* PC_relative. */
	64	0, /* Bitpos. */
	65	complain_overflow_bitfield, /* Complain_on_overflow. */
	66	bfd_elf_generic_reloc, /* Special_function. */
	67	"R_ARC_NONE", /* Name. */
	68	TRUE, /* Partial_inplace. */
	69	0, /* Src_mask. */
	70	0, /* Dst_mask. */
	71	FALSE), /* PCrel_offset. */
252b5132 RH	72
252b5132 RH	73	/* A standard 32 bit relocation. */
47b0e7ad NC	74	HOWTO (R_ARC_32, /* Type. */
	75	0, /* Rightshift. */
	76	2, /* Size (0 = byte, 1 = short, 2 = long). */
	77	32, /* Bitsize. */
	78	FALSE, /* PC_relative. */
	79	0, /* Bitpos. */
	80	complain_overflow_bitfield, /* Complain_on_overflow. */
	81	bfd_elf_generic_reloc, /* Special_function. */
	82	"R_ARC_32", /* Name. */
	83	TRUE, /* Partial_inplace. */
	84	0xffffffff, /* Src_mask. */
	85	0xffffffff, /* Dst_mask. */
	86	FALSE), /* PCrel_offset. */
252b5132 RH	87
252b5132 RH	88	/* A 26 bit absolute branch, right shifted by 2. */
47b0e7ad NC	89	HOWTO (R_ARC_B26, /* Type. */
	90	2, /* Rightshift. */
	91	2, /* Size (0 = byte, 1 = short, 2 = long). */
	92	26, /* Bitsize. */
	93	FALSE, /* PC_relative. */
	94	0, /* Bitpos. */
	95	complain_overflow_bitfield, /* Complain_on_overflow. */
	96	bfd_elf_generic_reloc, /* Special_function. */
	97	"R_ARC_B26", /* Name. */
	98	TRUE, /* Partial_inplace. */
	99	0x00ffffff, /* Src_mask. */
	100	0x00ffffff, /* Dst_mask. */
	101	FALSE), /* PCrel_offset. */
252b5132 RH	102
252b5132 RH	103	/* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
47b0e7ad NC	104	HOWTO (R_ARC_B22_PCREL, /* Type. */
	105	2, /* Rightshift. */
	106	2, /* Size (0 = byte, 1 = short, 2 = long). */
	107	22, /* Bitsize. */
	108	TRUE, /* PC_relative. */
	109	7, /* Bitpos. */
	110	complain_overflow_signed, /* Complain_on_overflow. */
	111	arc_elf_b22_pcrel, /* Special_function. */
	112	"R_ARC_B22_PCREL", /* Name. */
	113	TRUE, /* Partial_inplace. */
	114	0x07ffff80, /* Src_mask. */
	115	0x07ffff80, /* Dst_mask. */
	116	FALSE), /* PCrel_offset. */
252b5132 RH	117	};
	118
	119	/* Map BFD reloc types to ARC ELF reloc types. */
	120
	121	struct arc_reloc_map
	122	{
	123	bfd_reloc_code_real_type bfd_reloc_val;
	124	unsigned char elf_reloc_val;
	125	};
	126
	127	static const struct arc_reloc_map arc_reloc_map[] =
	128	{
	129	{ BFD_RELOC_NONE, R_ARC_NONE, },
	130	{ BFD_RELOC_32, R_ARC_32 },
	131	{ BFD_RELOC_CTOR, R_ARC_32 },
	132	{ BFD_RELOC_ARC_B26, R_ARC_B26 },
	133	{ BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
	134	};
	135
	136	static reloc_howto_type *
47b0e7ad NC	137	bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
47b0e7ad NC	138	bfd_reloc_code_real_type code)
252b5132 RH	139	{
	140	unsigned int i;
	141
ea04a8f6 NC	142	for (i = ARRAY_SIZE (arc_reloc_map); i--;)
	143	if (arc_reloc_map[i].bfd_reloc_val == code)
	144	return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val;
	145
252b5132 RH	146	return NULL;
	147	}
	148
157090f7 AM	149	static reloc_howto_type *
	150	bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
	151	const char *r_name)
	152	{
	153	unsigned int i;
	154
	155	for (i = 0;
	156	i < sizeof (elf_arc_howto_table) / sizeof (elf_arc_howto_table[0]);
	157	i++)
	158	if (elf_arc_howto_table[i].name != NULL
	159	&& strcasecmp (elf_arc_howto_table[i].name, r_name) == 0)
	160	return &elf_arc_howto_table[i];
	161
	162	return NULL;
	163	}
	164
252b5132 RH	165	/* Set the howto pointer for an ARC ELF reloc. */
	166
	167	static void
47b0e7ad NC	168	arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
	169	arelent *cache_ptr,
	170	Elf_Internal_Rela *dst)
252b5132 RH	171	{
	172	unsigned int r_type;
	173
	174	r_type = ELF32_R_TYPE (dst->r_info);
	175	BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
	176	cache_ptr->howto = &elf_arc_howto_table[r_type];
	177	}
	178
	179	/* Set the right machine number for an ARC ELF file. */
	180
b34976b6	181	static bfd_boolean
47b0e7ad	182	arc_elf_object_p (bfd *abfd)
252b5132	183	{
dc810e39	184	unsigned int mach = bfd_mach_arc_6;
252b5132	185
0d2bcfaf	186	if (elf_elfheader(abfd)->e_machine == EM_ARC)
252b5132	187	{
0d2bcfaf NC	188	unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
	189
	190	switch (arch)
	191	{
0d2bcfaf NC	192	case E_ARC_MACH_ARC5:
	193	mach = bfd_mach_arc_5;
	194	break;
bcee8eb8	195	default:
0d2bcfaf NC	196	case E_ARC_MACH_ARC6:
	197	mach = bfd_mach_arc_6;
	198	break;
	199	case E_ARC_MACH_ARC7:
	200	mach = bfd_mach_arc_7;
	201	break;
	202	case E_ARC_MACH_ARC8:
	203	mach = bfd_mach_arc_8;
	204	break;
	205	}
252b5132	206	}
0d2bcfaf	207	return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
252b5132 RH	208	}
	209
	210	/* The final processing done just before writing out an ARC ELF object file.
	211	This gets the ARC architecture right based on the machine number. */
	212
	213	static void
47b0e7ad NC	214	arc_elf_final_write_processing (bfd *abfd,
47b0e7ad NC	215	bfd_boolean linker ATTRIBUTE_UNUSED)
252b5132	216	{
252b5132 RH	217	unsigned long val;
252b5132 RH	218
0d2bcfaf	219	switch (bfd_get_mach (abfd))
252b5132	220	{
0d2bcfaf NC	221	case bfd_mach_arc_5:
	222	val = E_ARC_MACH_ARC5;
	223	break;
bcee8eb8	224	default:
0d2bcfaf NC	225	case bfd_mach_arc_6:
	226	val = E_ARC_MACH_ARC6;
	227	break;
	228	case bfd_mach_arc_7:
	229	val = E_ARC_MACH_ARC7;
	230	break;
	231	case bfd_mach_arc_8:
	232	val = E_ARC_MACH_ARC8;
	233	break;
252b5132	234	}
252b5132 RH	235	elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
	236	elf_elfheader (abfd)->e_flags \|= val;
	237	}
	238
6d00b590	239	#define TARGET_LITTLE_SYM arc_elf32_le_vec
47b0e7ad	240	#define TARGET_LITTLE_NAME "elf32-littlearc"
6d00b590	241	#define TARGET_BIG_SYM arc_elf32_be_vec
47b0e7ad NC	242	#define TARGET_BIG_NAME "elf32-bigarc"
	243	#define ELF_ARCH bfd_arch_arc
	244	#define ELF_MACHINE_CODE EM_ARC
	245	#define ELF_MAXPAGESIZE 0x1000
	246
	247	#define elf_info_to_howto 0
	248	#define elf_info_to_howto_rel arc_info_to_howto_rel
	249	#define elf_backend_object_p arc_elf_object_p
	250	#define elf_backend_final_write_processing arc_elf_final_write_processing
252b5132 RH	251
252b5132 RH	252	#include "elf32-target.h"