[deliverable/binutils-gdb.git] / bfd / elf32-i960.c

/* Intel 960 specific support for 32-bit ELF
   Copyright 1999, 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.

   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/i960.h"

#define USE_REL 1

#define bfd_elf32_bfd_reloc_type_lookup	elf32_i960_reloc_type_lookup
#define elf_info_to_howto		elf32_i960_info_to_howto
#define elf_info_to_howto_rel		elf32_i960_info_to_howto_rel

/* ELF relocs are against symbols.  If we are producing relocatable
   output, and the reloc is against an external symbol, and nothing
   has given us any additional addend, the resulting reloc will also
   be against the same symbol.  In such a case, we don't want to
   change anything about the way the reloc is handled, since it will
   all be done at final link time.  Rather than put special case code
   into bfd_perform_relocation, all the reloc types use this howto
   function.  It just short circuits the reloc if producing
   relocatable output against an external symbol.  */

static bfd_reloc_status_type
elf32_i960_relocate (bfd *abfd ATTRIBUTE_UNUSED,
		     arelent *reloc_entry,
		     asymbol *symbol,
		     PTR data ATTRIBUTE_UNUSED,
		     asection *input_section,
		     bfd *output_bfd,
		     char **error_message ATTRIBUTE_UNUSED)
{
  /* HACK: I think this first condition is necessary when producing
     relocatable output.  After the end of HACK, the code is identical
     to bfd_elf_generic_reloc().  I would _guess_ the first change
     belongs there rather than here.  martindo 1998-10-23.  */
  if (output_bfd != (bfd *) NULL
      && reloc_entry->howto->pc_relative
      && !reloc_entry->howto->pcrel_offset)
    reloc_entry->addend -= symbol->value;

  /* This is more dubious.  */
  else if (output_bfd != (bfd *) NULL
	   && (symbol->flags & BSF_SECTION_SYM) != 0)
    reloc_entry->addend -= symbol->section->output_section->vma;

  else
    {
      /* ...end of HACK.  */
      if (output_bfd != (bfd *) NULL
	  && (symbol->flags & BSF_SECTION_SYM) == 0
	  && (! reloc_entry->howto->partial_inplace
	      || reloc_entry->addend == 0))
	{
	  reloc_entry->address += input_section->output_offset;
	  return bfd_reloc_ok;
	}
    }

  return bfd_reloc_continue;
}

static reloc_howto_type elf_howto_table[]=
{
  HOWTO (R_960_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
	 elf32_i960_relocate, "R_960_NONE", TRUE,
	 0x00000000, 0x00000000, FALSE),
  EMPTY_HOWTO (1),
  HOWTO (R_960_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
	 elf32_i960_relocate, "R_960_32", TRUE,
	 0xffffffff, 0xffffffff, FALSE),
  HOWTO (R_960_IP24, 0, 2, 24, TRUE, 0, complain_overflow_signed,
	 elf32_i960_relocate, "R_960_IP24 ", TRUE,
	 0x00ffffff, 0x00ffffff, FALSE),
  EMPTY_HOWTO (4),
  EMPTY_HOWTO (5),
  EMPTY_HOWTO (6),
  EMPTY_HOWTO (7)
};

static enum elf_i960_reloc_type
elf32_i960_bfd_to_reloc_type (bfd_reloc_code_real_type code)
{
  switch (code)
    {
    default:
      return R_960_NONE;
    case BFD_RELOC_I960_CALLJ:
      return R_960_OPTCALL;
    case BFD_RELOC_32:
    case BFD_RELOC_CTOR:
      return R_960_32;
    case BFD_RELOC_24_PCREL:
      return R_960_IP24;
    }
}

static void
elf32_i960_info_to_howto (bfd *               abfd ATTRIBUTE_UNUSED,
			  arelent *           cache_ptr ATTRIBUTE_UNUSED,
			  Elf_Internal_Rela * dst ATTRIBUTE_UNUSED)
{
  abort ();
}

static void
elf32_i960_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
			      arelent *cache_ptr,
			      Elf_Internal_Rela *dst)
{
  enum elf_i960_reloc_type type;

  type = (enum elf_i960_reloc_type) ELF32_R_TYPE (dst->r_info);
  BFD_ASSERT (type < R_960_max);

  cache_ptr->howto = &elf_howto_table[(int) type];
}

static reloc_howto_type *
elf32_i960_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			      bfd_reloc_code_real_type code)
{
  return elf_howto_table + elf32_i960_bfd_to_reloc_type (code);
}

#define TARGET_LITTLE_SYM	bfd_elf32_i960_vec
#define TARGET_LITTLE_NAME	"elf32-i960"
#define ELF_ARCH		bfd_arch_i960
#define ELF_MACHINE_CODE	EM_960
#define ELF_MAXPAGESIZE  	1 /* FIXME: This number is wrong,  It should be the page size in bytes.  */

#include "elf32-target.h"
Commit	Line	Data
0eddce27	1	/* Intel 960 specific support for 32-bit ELF
47b0e7ad	2	Copyright 1999, 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
b2ef150d	3
47b0e7ad	4	This file is part of BFD, the Binary File Descriptor library.
b2ef150d	5
47b0e7ad NC	6	This program is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2 of the License, or
	9	(at your option) any later version.
b2ef150d	10
47b0e7ad NC	11	This program is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
b2ef150d	15
47b0e7ad NC	16	You should have received a copy of the GNU General Public License
	17	along with this program; if not, write to the Free Software
	18	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	19	MA 02110-1301, USA. */
b2ef150d ILT	20
	21	#include "bfd.h"
	22	#include "sysdep.h"
	23	#include "libbfd.h"
	24	#include "elf-bfd.h"
	25	#include "elf/i960.h"
	26
b2ef150d ILT	27	#define USE_REL 1
	28
	29	#define bfd_elf32_bfd_reloc_type_lookup elf32_i960_reloc_type_lookup
	30	#define elf_info_to_howto elf32_i960_info_to_howto
	31	#define elf_info_to_howto_rel elf32_i960_info_to_howto_rel
	32
47b0e7ad NC	33	/* ELF relocs are against symbols. If we are producing relocatable
	34	output, and the reloc is against an external symbol, and nothing
	35	has given us any additional addend, the resulting reloc will also
	36	be against the same symbol. In such a case, we don't want to
	37	change anything about the way the reloc is handled, since it will
	38	all be done at final link time. Rather than put special case code
	39	into bfd_perform_relocation, all the reloc types use this howto
	40	function. It just short circuits the reloc if producing
	41	relocatable output against an external symbol. */
	42
	43	static bfd_reloc_status_type
	44	elf32_i960_relocate (bfd *abfd ATTRIBUTE_UNUSED,
	45	arelent *reloc_entry,
	46	asymbol *symbol,
	47	PTR data ATTRIBUTE_UNUSED,
	48	asection *input_section,
	49	bfd *output_bfd,
	50	char **error_message ATTRIBUTE_UNUSED)
	51	{
	52	/* HACK: I think this first condition is necessary when producing
	53	relocatable output. After the end of HACK, the code is identical
	54	to bfd_elf_generic_reloc(). I would _guess_ the first change
	55	belongs there rather than here. martindo 1998-10-23. */
	56	if (output_bfd != (bfd *) NULL
	57	&& reloc_entry->howto->pc_relative
	58	&& !reloc_entry->howto->pcrel_offset)
	59	reloc_entry->addend -= symbol->value;
	60
	61	/* This is more dubious. */
	62	else if (output_bfd != (bfd *) NULL
	63	&& (symbol->flags & BSF_SECTION_SYM) != 0)
	64	reloc_entry->addend -= symbol->section->output_section->vma;
	65
	66	else
	67	{
	68	/* ...end of HACK. */
	69	if (output_bfd != (bfd *) NULL
	70	&& (symbol->flags & BSF_SECTION_SYM) == 0
	71	&& (! reloc_entry->howto->partial_inplace
	72	\|\| reloc_entry->addend == 0))
	73	{
	74	reloc_entry->address += input_section->output_offset;
	75	return bfd_reloc_ok;
	76	}
	77	}
	78
	79	return bfd_reloc_continue;
	80	}
	81
b2ef150d ILT	82	static reloc_howto_type elf_howto_table[]=
b2ef150d ILT	83	{
47b0e7ad NC	84	HOWTO (R_960_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
	85	elf32_i960_relocate, "R_960_NONE", TRUE,
	86	0x00000000, 0x00000000, FALSE),
5f771d47	87	EMPTY_HOWTO (1),
b34976b6	88	HOWTO (R_960_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
47b0e7ad NC	89	elf32_i960_relocate, "R_960_32", TRUE,
47b0e7ad NC	90	0xffffffff, 0xffffffff, FALSE),
b34976b6	91	HOWTO (R_960_IP24, 0, 2, 24, TRUE, 0, complain_overflow_signed,
47b0e7ad NC	92	elf32_i960_relocate, "R_960_IP24 ", TRUE,
47b0e7ad NC	93	0x00ffffff, 0x00ffffff, FALSE),
5f771d47 ILT	94	EMPTY_HOWTO (4),
	95	EMPTY_HOWTO (5),
	96	EMPTY_HOWTO (6),
	97	EMPTY_HOWTO (7)
b2ef150d ILT	98	};
	99
	100	static enum elf_i960_reloc_type
	101	elf32_i960_bfd_to_reloc_type (bfd_reloc_code_real_type code)
	102	{
	103	switch (code)
	104	{
	105	default:
	106	return R_960_NONE;
	107	case BFD_RELOC_I960_CALLJ:
	108	return R_960_OPTCALL;
	109	case BFD_RELOC_32:
	110	case BFD_RELOC_CTOR:
	111	return R_960_32;
	112	case BFD_RELOC_24_PCREL:
	113	return R_960_IP24;
	114	}
	115	}
	116
	117	static void
47b0e7ad NC	118	elf32_i960_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED,
	119	arelent * cache_ptr ATTRIBUTE_UNUSED,
	120	Elf_Internal_Rela * dst ATTRIBUTE_UNUSED)
b2ef150d ILT	121	{
	122	abort ();
	123	}
	124
	125	static void
47b0e7ad NC	126	elf32_i960_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
	127	arelent *cache_ptr,
	128	Elf_Internal_Rela *dst)
b2ef150d ILT	129	{
	130	enum elf_i960_reloc_type type;
	131
	132	type = (enum elf_i960_reloc_type) ELF32_R_TYPE (dst->r_info);
	133	BFD_ASSERT (type < R_960_max);
	134
	135	cache_ptr->howto = &elf_howto_table[(int) type];
	136	}
	137
b2ef150d	138	static reloc_howto_type *
47b0e7ad NC	139	elf32_i960_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
47b0e7ad NC	140	bfd_reloc_code_real_type code)
b2ef150d ILT	141	{
	142	return elf_howto_table + elf32_i960_bfd_to_reloc_type (code);
	143	}
	144
	145	#define TARGET_LITTLE_SYM bfd_elf32_i960_vec
	146	#define TARGET_LITTLE_NAME "elf32-i960"
	147	#define ELF_ARCH bfd_arch_i960
	148	#define ELF_MACHINE_CODE EM_960
79e5982f	149	#define ELF_MAXPAGESIZE 1 /* FIXME: This number is wrong, It should be the page size in bytes. */
b2ef150d ILT	150
b2ef150d ILT	151	#include "elf32-target.h"