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

/* ARC-specific support for 32-bit ELF
   Copyright (C) 1994, 1995 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

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

static bfd_reloc_status_type arc_elf_unsupported_reloc
  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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.  */
#define USE_REL

enum reloc_type
{
  R_ARC_NONE = 0,
  R_ARC_ADDR32,
  R_ARC_B22_PCREL,
  R_ARC_max
};

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_ADDR32,          /* 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_ADDR32",	/* name */
	 false,	                /* partial_inplace */                      
	 0,		        /* src_mask */                             
	 0xffffffff,   		/* dst_mask */                             
	 false),                /* pcrel_offset */

  /* A relative 22 bit branch; the lower two bits must be zero.  */
  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 */                      
	 0,		        /* src_mask */                             
	 0x07ffff80,   		/* dst_mask */                             
	 true),                 /* pcrel_offset */

};

/* Don't pretend we can deal with unsupported relocs.  */

static bfd_reloc_status_type
arc_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
			   output_bfd, error_message)
     bfd *abfd;
     arelent *reloc_entry;
     asymbol *symbol;
     PTR data;
     asection *input_section;
     bfd *output_bfd;
     char **error_message;
{
  abort ();
}

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

struct arc_reloc_map
{
  unsigned char 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_ADDR32 },
  { BFD_RELOC_CTOR, R_ARC_ADDR32 },
  { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
};

static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
     bfd *abfd;
     bfd_reloc_code_real_type code;
{
  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;
     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;
    case E_ARC_MACH_HOST:
      mach = bfd_mach_arc_host;
      break;
    case E_ARC_MACH_GRAPHICS:
      mach = bfd_mach_arc_graphics;
      break;
    case E_ARC_MACH_AUDIO:
      mach = bfd_mach_arc_audio;
      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;
{
  int mach;
  unsigned long val;

  switch (mach = bfd_get_mach (abfd))
    {
    case bfd_mach_arc_base:
      val = E_ARC_MACH_BASE;
      break;
    case bfd_mach_arc_host:
      val = E_ARC_MACH_HOST;
      break;
    case bfd_mach_arc_graphics:
      val = E_ARC_MACH_GRAPHICS;
      break;
    case bfd_mach_arc_audio:
      val = E_ARC_MACH_AUDIO;
      break;
    default:
      return;
    }

  elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
  elf_elfheader (abfd)->e_flags |= val;
}

#define TARGET_LITTLE_SYM	bfd_elf32_arc_vec
#define TARGET_LITTLE_NAME	"elf32-arc"
#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
82b1edf7	1	/* ARC-specific support for 32-bit ELF
866da18e	2	Copyright (C) 1994, 1995 Free Software Foundation, Inc.
82b1edf7 KR	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., 675 Mass Ave, Cambridge, MA 02139, USA. */
	20
	21	#include "bfd.h"
	22	#include "sysdep.h"
	23	#include "libbfd.h"
	24	#include "libelf.h"
866da18e	25	#include "elf/arc.h"
82b1edf7 KR	26
	27	static bfd_reloc_status_type arc_elf_unsupported_reloc
	28	PARAMS ((bfd , arelent , asymbol , PTR, asection , bfd , char *));
866da18e	29	static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
82b1edf7	30	PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
866da18e DE	31	static void arc_info_to_howto_rel
	32	PARAMS ((bfd , arelent , Elf32_Internal_Rel *));
	33	static boolean arc_elf_object_p PARAMS ((bfd *));
	34	static void arc_elf_final_write_processing PARAMS ((bfd *, boolean));
	35
	36	/* Try to minimize the amount of space occupied by relocation tables
	37	on the ROM. */
	38	#define USE_REL
82b1edf7 KR	39
	40	enum reloc_type
	41	{
	42	R_ARC_NONE = 0,
	43	R_ARC_ADDR32,
	44	R_ARC_B22_PCREL,
	45	R_ARC_max
	46	};
	47
	48	static reloc_howto_type elf_arc_howto_table[] =
	49	{
	50	/* This reloc does nothing. */
	51	HOWTO (R_ARC_NONE, /* type */
	52	0, /* rightshift */
	53	2, /* size (0 = byte, 1 = short, 2 = long) */
	54	32, /* bitsize */
	55	false, /* pc_relative */
	56	0, /* bitpos */
	57	complain_overflow_bitfield, /* complain_on_overflow */
	58	bfd_elf_generic_reloc, /* special_function */
	59	"R_ARC_NONE", /* name */
	60	false, /* partial_inplace */
	61	0, /* src_mask */
	62	0, /* dst_mask */
	63	false), /* pcrel_offset */
	64
	65	/* A standard 32 bit relocation. */
	66	HOWTO (R_ARC_ADDR32, /* type */
	67	0, /* rightshift */
	68	2, /* size (0 = byte, 1 = short, 2 = long) */
	69	32, /* bitsize */
	70	false, /* pc_relative */
	71	0, /* bitpos */
	72	complain_overflow_bitfield, /* complain_on_overflow */
	73	bfd_elf_generic_reloc, /* special_function */
	74	"R_ARC_ADDR32", /* name */
	75	false, /* partial_inplace */
	76	0, /* src_mask */
	77	0xffffffff, /* dst_mask */
	78	false), /* pcrel_offset */
	79
	80	/* A relative 22 bit branch; the lower two bits must be zero. */
	81	HOWTO (R_ARC_B22_PCREL, /* type */
	82	2, /* rightshift */
	83	2, /* size (0 = byte, 1 = short, 2 = long) */
	84	22, /* bitsize */
	85	true, /* pc_relative */
	86	7, /* bitpos */
	87	complain_overflow_signed, /* complain_on_overflow */
	88	bfd_elf_generic_reloc, /* special_function */
	89	"R_ARC_B22_PCREL", /* name */
	90	false, /* partial_inplace */
	91	0, /* src_mask */
	92	0x07ffff80, /* dst_mask */
	93	true), /* pcrel_offset */
	94
	95	};
	96
	97	/* Don't pretend we can deal with unsupported relocs. */
	98
	99	static bfd_reloc_status_type
	100	arc_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
	101	output_bfd, error_message)
	102	bfd *abfd;
103	arelent *reloc_entry;
104	asymbol *symbol;
105	PTR data;
106	asection *input_section;
107	bfd *output_bfd;
108	char **error_message;
109	{
110	abort ();
111	}
112
866da18e	113	/* Map BFD reloc types to ARC ELF reloc types. */
82b1edf7 KR	114
	115	struct arc_reloc_map
	116	{
	117	unsigned char bfd_reloc_val;
	118	unsigned char elf_reloc_val;
	119	};
	120
	121	static const struct arc_reloc_map arc_reloc_map[] =
	122	{
	123	{ BFD_RELOC_NONE, R_ARC_NONE, },
	124	{ BFD_RELOC_32, R_ARC_ADDR32 },
	125	{ BFD_RELOC_CTOR, R_ARC_ADDR32 },
	126	{ BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
	127	};
	128
866da18e	129	static reloc_howto_type *
82b1edf7 KR	130	bfd_elf32_bfd_reloc_type_lookup (abfd, code)
	131	bfd *abfd;
	132	bfd_reloc_code_real_type code;
	133	{
	134	int i;
	135
	136	for (i = 0;
	137	i < sizeof (arc_reloc_map) / sizeof (struct arc_reloc_map);
	138	i++)
	139	{
	140	if (arc_reloc_map[i].bfd_reloc_val == code)
	141	return &elf_arc_howto_table[arc_reloc_map[i].elf_reloc_val];
	142	}
	143
	144	return NULL;
	145	}
	146
	147	/* Set the howto pointer for an ARC ELF reloc. */
	148
	149	static void
866da18e	150	arc_info_to_howto_rel (abfd, cache_ptr, dst)
82b1edf7 KR	151	bfd *abfd;
82b1edf7 KR	152	arelent *cache_ptr;
866da18e DE	153	Elf32_Internal_Rel *dst;
	154	{
	155	unsigned int r_type;
	156
	157	r_type = ELF32_R_TYPE (dst->r_info);
	158	BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
	159	cache_ptr->howto = &elf_arc_howto_table[r_type];
	160	}
	161
	162	/* Set the right machine number for an ARC ELF file. */
	163
	164	static boolean
	165	arc_elf_object_p (abfd)
	166	bfd *abfd;
	167	{
	168	int mach;
ac5357fa	169	unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
866da18e DE	170
	171	switch (arch)
	172	{
ac5357fa	173	case E_ARC_MACH_BASE:
866da18e DE	174	mach = bfd_mach_arc_base;
866da18e DE	175	break;
ac5357fa	176	case E_ARC_MACH_HOST:
866da18e DE	177	mach = bfd_mach_arc_host;
866da18e DE	178	break;
ac5357fa	179	case E_ARC_MACH_GRAPHICS:
866da18e DE	180	mach = bfd_mach_arc_graphics;
866da18e DE	181	break;
ac5357fa	182	case E_ARC_MACH_AUDIO:
866da18e DE	183	mach = bfd_mach_arc_audio;
	184	break;
	185	default:
	186	/* Unknown cpu type. ??? What to do? */
	187	return false;
	188	}
	189
	190	(void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
	191	return true;
	192	}
	193
	194	/* The final processing done just before writing out an ARC ELF object file.
	195	This gets the ARC architecture right based on the machine number. */
	196
	197	static void
	198	arc_elf_final_write_processing (abfd, linker)
	199	bfd *abfd;
	200	boolean linker;
82b1edf7	201	{
866da18e DE	202	int mach;
	203	unsigned long val;
	204
	205	switch (mach = bfd_get_mach (abfd))
	206	{
	207	case bfd_mach_arc_base:
ac5357fa	208	val = E_ARC_MACH_BASE;
866da18e DE	209	break;
866da18e DE	210	case bfd_mach_arc_host:
ac5357fa	211	val = E_ARC_MACH_HOST;
866da18e DE	212	break;
866da18e DE	213	case bfd_mach_arc_graphics:
ac5357fa	214	val = E_ARC_MACH_GRAPHICS;
866da18e DE	215	break;
866da18e DE	216	case bfd_mach_arc_audio:
ac5357fa	217	val = E_ARC_MACH_AUDIO;
866da18e DE	218	break;
	219	default:
	220	return;
	221	}
	222
ac5357fa	223	elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
866da18e	224	elf_elfheader (abfd)->e_flags \|= val;
82b1edf7 KR	225	}
82b1edf7 KR	226
866da18e DE	227	#define TARGET_LITTLE_SYM bfd_elf32_arc_vec
866da18e DE	228	#define TARGET_LITTLE_NAME "elf32-arc"
82b1edf7 KR	229	#define ELF_ARCH bfd_arch_arc
82b1edf7 KR	230	#define ELF_MACHINE_CODE EM_CYGNUS_ARC
866da18e DE	231	#define ELF_MAXPAGESIZE 0x1000
	232
	233	#define elf_info_to_howto 0
	234	#define elf_info_to_howto_rel arc_info_to_howto_rel
	235	#define elf_backend_object_p arc_elf_object_p
	236	#define elf_backend_final_write_processing \
	237	arc_elf_final_write_processing
82b1edf7 KR	238
82b1edf7 KR	239	#include "elf32-target.h"