elf32-i960.c revision 1.1.1.3 
1/* Intel 860 specific support for 32-bit ELF
2   Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3
4This file is part of BFD, the Binary File Descriptor library.
5
6This program is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 2 of the License, or
9(at your option) any later version.
10
11This program is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with this program; if not, write to the Free Software
18Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
19
20#include "bfd.h"
21#include "sysdep.h"
22#include "libbfd.h"
23#include "elf-bfd.h"
24#include "elf/i960.h"
25
26static bfd_reloc_status_type elf32_i960_relocate
27  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
28static reloc_howto_type *elf32_i960_reloc_type_lookup
29  PARAMS ((bfd *, bfd_reloc_code_real_type));
30static void elf32_i960_info_to_howto
31  PARAMS ((bfd *, arelent *cache_ptr, Elf_Internal_Rela *));
32static void elf32_i960_info_to_howto_rel
33  PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
34
35#define USE_REL 1
36
37#define bfd_elf32_bfd_reloc_type_lookup	elf32_i960_reloc_type_lookup
38#define elf_info_to_howto		elf32_i960_info_to_howto
39#define elf_info_to_howto_rel		elf32_i960_info_to_howto_rel
40
41static reloc_howto_type elf_howto_table[]=
42{
43  HOWTO(R_960_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
44	elf32_i960_relocate, "R_960_NONE", TRUE,
45	0x00000000, 0x00000000, FALSE),
46  EMPTY_HOWTO (1),
47  HOWTO (R_960_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
48	elf32_i960_relocate, "R_960_32", TRUE,
49	0xffffffff, 0xffffffff, FALSE),
50  HOWTO (R_960_IP24, 0, 2, 24, TRUE, 0, complain_overflow_signed,
51	elf32_i960_relocate, "R_960_IP24 ", TRUE,
52	0x00ffffff, 0x00ffffff, FALSE),
53  EMPTY_HOWTO (4),
54  EMPTY_HOWTO (5),
55  EMPTY_HOWTO (6),
56  EMPTY_HOWTO (7)
57};
58
59static enum elf_i960_reloc_type
60elf32_i960_bfd_to_reloc_type (bfd_reloc_code_real_type code)
61{
62  switch (code)
63    {
64    default:
65      return R_960_NONE;
66    case BFD_RELOC_I960_CALLJ:
67      return R_960_OPTCALL;
68    case BFD_RELOC_32:
69    case BFD_RELOC_CTOR:
70      return R_960_32;
71    case BFD_RELOC_24_PCREL:
72      return R_960_IP24;
73    }
74}
75
76static void
77elf32_i960_info_to_howto (abfd, cache_ptr, dst)
78     bfd		*abfd ATTRIBUTE_UNUSED;
79     arelent		*cache_ptr ATTRIBUTE_UNUSED;
80     Elf_Internal_Rela *dst ATTRIBUTE_UNUSED;
81{
82  abort ();
83}
84
85static void
86elf32_i960_info_to_howto_rel (abfd, cache_ptr, dst)
87     bfd *abfd ATTRIBUTE_UNUSED;
88     arelent *cache_ptr;
89     Elf_Internal_Rela *dst;
90{
91  enum elf_i960_reloc_type type;
92
93  type = (enum elf_i960_reloc_type) ELF32_R_TYPE (dst->r_info);
94  BFD_ASSERT (type < R_960_max);
95
96  cache_ptr->howto = &elf_howto_table[(int) type];
97}
98
99/* ELF relocs are against symbols.  If we are producing relocateable
100   output, and the reloc is against an external symbol, and nothing
101   has given us any additional addend, the resulting reloc will also
102   be against the same symbol.  In such a case, we don't want to
103   change anything about the way the reloc is handled, since it will
104   all be done at final link time.  Rather than put special case code
105   into bfd_perform_relocation, all the reloc types use this howto
106   function.  It just short circuits the reloc if producing
107   relocateable output against an external symbol.  */
108
109bfd_reloc_status_type
110elf32_i960_relocate (abfd,
111		       reloc_entry,
112		       symbol,
113		       data,
114		       input_section,
115		       output_bfd,
116		       error_message)
117     bfd *abfd ATTRIBUTE_UNUSED;
118     arelent *reloc_entry;
119     asymbol *symbol;
120     PTR data ATTRIBUTE_UNUSED;
121     asection *input_section;
122     bfd *output_bfd;
123     char **error_message ATTRIBUTE_UNUSED;
124{
125  /* HACK: I think this first condition is necessary when producing
126     relocatable output.  After the end of HACK, the code is identical
127     to bfd_elf_generic_reloc().  I would _guess_ the first change
128     belongs there rather than here.  martindo 1998-10-23.  */
129  if (output_bfd != (bfd *) NULL
130      && reloc_entry->howto->pc_relative
131      && !reloc_entry->howto->pcrel_offset)
132    {
133      reloc_entry->addend -= symbol->value;
134    }
135  /* This is more dubious.  */
136  else if (output_bfd != (bfd *) NULL
137	   && (symbol->flags & BSF_SECTION_SYM) != 0)
138    {
139      reloc_entry->addend -= symbol->section->output_section->vma;
140    }
141  else
142    {
143      /* end of HACK */
144      if (output_bfd != (bfd *) NULL
145	  && (symbol->flags & BSF_SECTION_SYM) == 0
146	  && (! reloc_entry->howto->partial_inplace
147	      || reloc_entry->addend == 0))
148	{
149	  reloc_entry->address += input_section->output_offset;
150	  return bfd_reloc_ok;
151	}
152    }
153
154  return bfd_reloc_continue;
155}
156
157static reloc_howto_type *
158elf32_i960_reloc_type_lookup (abfd, code)
159     bfd *abfd ATTRIBUTE_UNUSED;
160     bfd_reloc_code_real_type code;
161{
162  return elf_howto_table + elf32_i960_bfd_to_reloc_type (code);
163}
164
165#define TARGET_LITTLE_SYM	bfd_elf32_i960_vec
166#define TARGET_LITTLE_NAME	"elf32-i960"
167#define ELF_ARCH		bfd_arch_i960
168#define ELF_MACHINE_CODE	EM_960
169#define ELF_MAXPAGESIZE  	1 /* FIXME: This number is wrong,  It should be the page size in bytes.  */
170
171#include "elf32-target.h"
172