elf32-i960.c revision 1.1.1.2 
1/* Intel 860 specific support for 32-bit ELF
2   Copyright 1999, 2000 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));
30
31#define USE_REL 1
32
33#define bfd_elf32_bfd_reloc_type_lookup	elf32_i960_reloc_type_lookup
34#define elf_info_to_howto		elf32_i960_info_to_howto
35#define elf_info_to_howto_rel		elf32_i960_info_to_howto_rel
36
37static reloc_howto_type elf_howto_table[]=
38{
39  HOWTO(R_960_NONE, 0, 0, 0, false, 0, complain_overflow_bitfield,
40	elf32_i960_relocate, "R_960_NONE", true,
41	0x00000000, 0x00000000, false),
42  EMPTY_HOWTO (1),
43  HOWTO (R_960_32, 0, 2, 32, false, 0, complain_overflow_bitfield,
44	elf32_i960_relocate, "R_960_32", true,
45	0xffffffff, 0xffffffff, false),
46  HOWTO (R_960_IP24, 0, 2, 24, true, 0, complain_overflow_signed,
47	elf32_i960_relocate, "R_960_IP24 ", true,
48	0x00ffffff, 0x00ffffff, false),
49  EMPTY_HOWTO (4),
50  EMPTY_HOWTO (5),
51  EMPTY_HOWTO (6),
52  EMPTY_HOWTO (7)
53};
54
55static enum elf_i960_reloc_type
56elf32_i960_bfd_to_reloc_type (bfd_reloc_code_real_type code)
57{
58  switch (code)
59    {
60    default:
61      return R_960_NONE;
62    case BFD_RELOC_I960_CALLJ:
63      return R_960_OPTCALL;
64    case BFD_RELOC_32:
65    case BFD_RELOC_CTOR:
66      return R_960_32;
67    case BFD_RELOC_24_PCREL:
68      return R_960_IP24;
69    }
70}
71
72static void
73elf32_i960_info_to_howto (abfd, cache_ptr, dst)
74     bfd		*abfd ATTRIBUTE_UNUSED;
75     arelent		*cache_ptr ATTRIBUTE_UNUSED;
76     Elf32_Internal_Rela *dst ATTRIBUTE_UNUSED;
77{
78  abort ();
79}
80
81static void
82elf32_i960_info_to_howto_rel (abfd, cache_ptr, dst)
83     bfd *abfd ATTRIBUTE_UNUSED;
84     arelent *cache_ptr;
85     Elf32_Internal_Rel *dst;
86{
87  enum elf_i960_reloc_type type;
88
89  type = (enum elf_i960_reloc_type) ELF32_R_TYPE (dst->r_info);
90  BFD_ASSERT (type < R_960_max);
91
92  cache_ptr->howto = &elf_howto_table[(int) type];
93}
94
95/* ELF relocs are against symbols.  If we are producing relocateable
96   output, and the reloc is against an external symbol, and nothing
97   has given us any additional addend, the resulting reloc will also
98   be against the same symbol.  In such a case, we don't want to
99   change anything about the way the reloc is handled, since it will
100   all be done at final link time.  Rather than put special case code
101   into bfd_perform_relocation, all the reloc types use this howto
102   function.  It just short circuits the reloc if producing
103   relocateable output against an external symbol.  */
104
105bfd_reloc_status_type
106elf32_i960_relocate (abfd,
107		       reloc_entry,
108		       symbol,
109		       data,
110		       input_section,
111		       output_bfd,
112		       error_message)
113     bfd *abfd ATTRIBUTE_UNUSED;
114     arelent *reloc_entry;
115     asymbol *symbol;
116     PTR data ATTRIBUTE_UNUSED;
117     asection *input_section;
118     bfd *output_bfd;
119     char **error_message ATTRIBUTE_UNUSED;
120{
121  /* HACK: I think this first condition is necessary when producing
122     relocatable output.  After the end of HACK, the code is identical
123     to bfd_elf_generic_reloc().  I would _guess_ the first change
124     belongs there rather than here.  martindo 1998-10-23.  */
125  if (output_bfd != (bfd *) NULL
126      && reloc_entry->howto->pc_relative
127      && !reloc_entry->howto->pcrel_offset)
128    {
129      reloc_entry->addend -= symbol->value;
130    }
131  /* This is more dubious.  */
132  else if (output_bfd != (bfd *) NULL
133	   && (symbol->flags & BSF_SECTION_SYM) != 0)
134    {
135      reloc_entry->addend -= symbol->section->output_section->vma;
136    }
137  else
138    {
139      /* end of HACK */
140      if (output_bfd != (bfd *) NULL
141	  && (symbol->flags & BSF_SECTION_SYM) == 0
142	  && (! reloc_entry->howto->partial_inplace
143	      || reloc_entry->addend == 0))
144	{
145	  reloc_entry->address += input_section->output_offset;
146	  return bfd_reloc_ok;
147	}
148    }
149
150  return bfd_reloc_continue;
151}
152
153static reloc_howto_type *
154elf32_i960_reloc_type_lookup (abfd, code)
155     bfd *abfd ATTRIBUTE_UNUSED;
156     bfd_reloc_code_real_type code;
157{
158  return elf_howto_table + elf32_i960_bfd_to_reloc_type (code);
159}
160
161#define TARGET_LITTLE_SYM	bfd_elf32_i960_vec
162#define TARGET_LITTLE_NAME	"elf32-i960"
163#define ELF_ARCH		bfd_arch_i960
164#define ELF_MACHINE_CODE	EM_960
165#define ELF_MAXPAGESIZE  	1 /* FIXME: This number is wrong,  It should be the page size in bytes.  */
166
167#include "elf32-target.h"
168