1/* Intel 960 specific support for 32-bit ELF
2   Copyright 1999, 2000, 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
3
4   This file is part of BFD, the Binary File Descriptor library.
5
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.
10
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.
15
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.  */
20
21#include "bfd.h"
22#include "sysdep.h"
23#include "libbfd.h"
24#include "elf-bfd.h"
25#include "elf/i960.h"
26
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
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
43static bfd_reloc_status_type
44elf32_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
82static reloc_howto_type elf_howto_table[]=
83{
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),
87  EMPTY_HOWTO (1),
88  HOWTO (R_960_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89	 elf32_i960_relocate, "R_960_32", TRUE,
90	 0xffffffff, 0xffffffff, FALSE),
91  HOWTO (R_960_IP24, 0, 2, 24, TRUE, 0, complain_overflow_signed,
92	 elf32_i960_relocate, "R_960_IP24 ", TRUE,
93	 0x00ffffff, 0x00ffffff, FALSE),
94  EMPTY_HOWTO (4),
95  EMPTY_HOWTO (5),
96  EMPTY_HOWTO (6),
97  EMPTY_HOWTO (7)
98};
99
100static enum elf_i960_reloc_type
101elf32_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
117static void
118elf32_i960_info_to_howto (bfd *               abfd ATTRIBUTE_UNUSED,
119			  arelent *           cache_ptr ATTRIBUTE_UNUSED,
120			  Elf_Internal_Rela * dst ATTRIBUTE_UNUSED)
121{
122  abort ();
123}
124
125static void
126elf32_i960_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
127			      arelent *cache_ptr,
128			      Elf_Internal_Rela *dst)
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
138static reloc_howto_type *
139elf32_i960_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
140			      bfd_reloc_code_real_type code)
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
149#define ELF_MAXPAGESIZE  	1 /* FIXME: This number is wrong,  It should be the page size in bytes.  */
150
151#include "elf32-target.h"
152