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

/* ARC-specific support for 32-bit ELF
   Copyright (C) 1994, 1995, 1997, 1999 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

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

static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
 PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void arc_info_to_howto_rel
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static boolean arc_elf_object_p PARAMS ((bfd *));
static void arc_elf_final_write_processing PARAMS ((bfd *, boolean));

/* 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

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 */
	 false,			/* 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 */
	 false,	                /* 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 */
	 false,			/* 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 */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_ARC_B22_PCREL",	/* name */
	 false,			/* partial_inplace */
	 0x07ffff80,		/* src_mask */
	 0x07ffff80,		/* dst_mask */
	 true),			/* 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 (abfd, code)
     bfd *abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  unsigned int i;

  for (i = 0;
       i < sizeof (arc_reloc_map) / sizeof (struct 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;
}

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

static void
arc_info_to_howto_rel (abfd, cache_ptr, dst)
     bfd *abfd ATTRIBUTE_UNUSED;
     arelent *cache_ptr;
     Elf32_Internal_Rel *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 boolean
arc_elf_object_p (abfd)
     bfd *abfd;
{
  int mach;
  unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;

  switch (arch)
    {
    case E_ARC_MACH_BASE:
      mach = bfd_mach_arc_base;
      break;
    default:
      /* Unknown cpu type.  ??? What to do?  */
      return false;
    }

  (void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
  return true;
}

/* 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 (abfd, linker)
     bfd *abfd;
     boolean linker ATTRIBUTE_UNUSED;
{
  int mach;
  unsigned long val;

  switch (mach = bfd_get_mach (abfd))
    {
    case bfd_mach_arc_base:
      val = E_ARC_MACH_BASE;
      break;
    default:
      return;
    }

  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_CYGNUS_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
5f771d47	2	Copyright (C) 1994, 1995, 1997, 1999 Free Software Foundation, Inc.
252b5132 RH	3	Contributed by Doug Evans (dje@cygnus.com).
	4
	5	This file is part of BFD, the Binary File Descriptor library.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	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.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	20
	21	#include "bfd.h"
	22	#include "sysdep.h"
	23	#include "libbfd.h"
	24	#include "elf-bfd.h"
	25	#include "elf/arc.h"
	26
	27	static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
	28	PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
	29	static void arc_info_to_howto_rel
	30	PARAMS ((bfd , arelent , Elf32_Internal_Rel *));
	31	static boolean arc_elf_object_p PARAMS ((bfd *));
	32	static void arc_elf_final_write_processing PARAMS ((bfd *, boolean));
	33
	34	/* Try to minimize the amount of space occupied by relocation tables
	35	on the ROM (not that the ROM won't be swamped by other ELF overhead). */
	36	#define USE_REL
	37
	38	static reloc_howto_type elf_arc_howto_table[] =
	39	{
	40	/* This reloc does nothing. */
	41	HOWTO (R_ARC_NONE, /* type */
	42	0, /* rightshift */
	43	2, /* size (0 = byte, 1 = short, 2 = long) */
	44	32, /* bitsize */
	45	false, /* pc_relative */
	46	0, /* bitpos */
	47	complain_overflow_bitfield, /* complain_on_overflow */
	48	bfd_elf_generic_reloc, /* special_function */
	49	"R_ARC_NONE", /* name */
	50	false, /* partial_inplace */
	51	0, /* src_mask */
	52	0, /* dst_mask */
	53	false), /* pcrel_offset */
	54
	55	/* A standard 32 bit relocation. */
	56	HOWTO (R_ARC_32, /* type */
	57	0, /* rightshift */
	58	2, /* size (0 = byte, 1 = short, 2 = long) */
	59	32, /* bitsize */
	60	false, /* pc_relative */
	61	0, /* bitpos */
	62	complain_overflow_bitfield, /* complain_on_overflow */
	63	bfd_elf_generic_reloc, /* special_function */
	64	"R_ARC_32", /* name */
	65	false, /* partial_inplace */
	66	0xffffffff, /* src_mask */
67	0xffffffff, /* dst_mask */
68	false), /* pcrel_offset */
69
70	/* A 26 bit absolute branch, right shifted by 2. */
71	HOWTO (R_ARC_B26, /* type */
72	2, /* rightshift */
73	2, /* size (0 = byte, 1 = short, 2 = long) */
74	26, /* bitsize */
75	false, /* pc_relative */
76	0, /* bitpos */
77	complain_overflow_bitfield, /* complain_on_overflow */
78	bfd_elf_generic_reloc, /* special_function */
79	"R_ARC_B26", /* name */
80	false, /* partial_inplace */
81	0x00ffffff, /* src_mask */
82	0x00ffffff, /* dst_mask */
83	false), /* pcrel_offset */
84
85	/* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */
86	HOWTO (R_ARC_B22_PCREL, /* type */
87	2, /* rightshift */
88	2, /* size (0 = byte, 1 = short, 2 = long) */
89	22, /* bitsize */
90	true, /* pc_relative */
91	7, /* bitpos */
92	complain_overflow_signed, /* complain_on_overflow */
93	bfd_elf_generic_reloc, /* special_function */
94	"R_ARC_B22_PCREL", /* name */
95	false, /* partial_inplace */
96	0x07ffff80, /* src_mask */
97	0x07ffff80, /* dst_mask */
98	true), /* pcrel_offset */
99
100	};
101
102	/* Map BFD reloc types to ARC ELF reloc types. */
103
104	struct arc_reloc_map
105	{
106	bfd_reloc_code_real_type bfd_reloc_val;
107	unsigned char elf_reloc_val;
108	};
109
110	static const struct arc_reloc_map arc_reloc_map[] =
111	{
112	{ BFD_RELOC_NONE, R_ARC_NONE, },
113	{ BFD_RELOC_32, R_ARC_32 },
114	{ BFD_RELOC_CTOR, R_ARC_32 },
115	{ BFD_RELOC_ARC_B26, R_ARC_B26 },
116	{ BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
117	};
118
119	static reloc_howto_type *
120	bfd_elf32_bfd_reloc_type_lookup (abfd, code)
5f771d47	121	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	122	bfd_reloc_code_real_type code;
	123	{
	124	unsigned int i;
	125
	126	for (i = 0;
	127	i < sizeof (arc_reloc_map) / sizeof (struct arc_reloc_map);
	128	i++)
	129	{
	130	if (arc_reloc_map[i].bfd_reloc_val == code)
	131	return &elf_arc_howto_table[arc_reloc_map[i].elf_reloc_val];
	132	}
	133
	134	return NULL;
	135	}
	136
	137	/* Set the howto pointer for an ARC ELF reloc. */
	138
	139	static void
	140	arc_info_to_howto_rel (abfd, cache_ptr, dst)
5f771d47	141	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	142	arelent *cache_ptr;
	143	Elf32_Internal_Rel *dst;
	144	{
	145	unsigned int r_type;
	146
	147	r_type = ELF32_R_TYPE (dst->r_info);
	148	BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
	149	cache_ptr->howto = &elf_arc_howto_table[r_type];
	150	}
	151
	152	/* Set the right machine number for an ARC ELF file. */
	153
	154	static boolean
	155	arc_elf_object_p (abfd)
	156	bfd *abfd;
	157	{
	158	int mach;
	159	unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
	160
	161	switch (arch)
	162	{
	163	case E_ARC_MACH_BASE:
	164	mach = bfd_mach_arc_base;
	165	break;
	166	default:
	167	/* Unknown cpu type. ??? What to do? */
	168	return false;
	169	}
	170
	171	(void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
	172	return true;
	173	}
	174
	175	/* The final processing done just before writing out an ARC ELF object file.
	176	This gets the ARC architecture right based on the machine number. */
	177
	178	static void
	179	arc_elf_final_write_processing (abfd, linker)
	180	bfd *abfd;
5f771d47	181	boolean linker ATTRIBUTE_UNUSED;
252b5132 RH	182	{
	183	int mach;
	184	unsigned long val;
	185
	186	switch (mach = bfd_get_mach (abfd))
	187	{
	188	case bfd_mach_arc_base:
	189	val = E_ARC_MACH_BASE;
	190	break;
	191	default:
	192	return;
	193	}
	194
	195	elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
	196	elf_elfheader (abfd)->e_flags \|= val;
	197	}
	198
	199	#define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec
	200	#define TARGET_LITTLE_NAME "elf32-littlearc"
	201	#define TARGET_BIG_SYM bfd_elf32_bigarc_vec
	202	#define TARGET_BIG_NAME "elf32-bigarc"
	203	#define ELF_ARCH bfd_arch_arc
	204	#define ELF_MACHINE_CODE EM_CYGNUS_ARC
	205	#define ELF_MAXPAGESIZE 0x1000
	206
	207	#define elf_info_to_howto 0
	208	#define elf_info_to_howto_rel arc_info_to_howto_rel
	209	#define elf_backend_object_p arc_elf_object_p
	210	#define elf_backend_final_write_processing \
	211	arc_elf_final_write_processing
	212
	213	#include "elf32-target.h"