elf32-i960.c revision 1.1.1.1 
1/* Intel 860 specific support for 32-bit ELF
2   Copyright 1999 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
105/*ARGSUSED*/
106bfd_reloc_status_type
107elf32_i960_relocate (abfd,
108		       reloc_entry,
109		       symbol,
110		       data,
111		       input_section,
112		       output_bfd,
113		       error_message)
114     bfd *abfd ATTRIBUTE_UNUSED;
115     arelent *reloc_entry;
116     asymbol *symbol;
117     PTR data ATTRIBUTE_UNUSED;
118     asection *input_section;
119     bfd *output_bfd;
120     char **error_message ATTRIBUTE_UNUSED;
121{
122  /* HACK: I think this first condition is necessary when producing
123     relocatable output.  After the end of HACK, the code is identical
124     to bfd_elf_generic_reloc().  I would _guess_ the first change
125     belongs there rather than here.  martindo 1998-10-23.  */
126  if (output_bfd != (bfd *) NULL
127      && reloc_entry->howto->pc_relative
128      && !reloc_entry->howto->pcrel_offset)
129    {
130      reloc_entry->addend -= symbol->value;
131    }
132  /* This is more dubious. */
133  else if (output_bfd != (bfd *) NULL
134	   && (symbol->flags & BSF_SECTION_SYM) != 0)
135    {
136      reloc_entry->addend -= symbol->section->output_section->vma;
137    }
138  else
139    {
140      /* end of HACK */
141      if (output_bfd != (bfd *) NULL
142	  && (symbol->flags & BSF_SECTION_SYM) == 0
143	  && (! reloc_entry->howto->partial_inplace
144	      || reloc_entry->addend == 0))
145	{
146	  reloc_entry->address += input_section->output_offset;
147	  return bfd_reloc_ok;
148	}
149    }
150
151  return bfd_reloc_continue;
152}
153
154static reloc_howto_type *
155elf32_i960_reloc_type_lookup (abfd, code)
156     bfd *abfd ATTRIBUTE_UNUSED;
157     bfd_reloc_code_real_type code;
158{
159  return elf_howto_table + elf32_i960_bfd_to_reloc_type (code);
160}
161
162#define TARGET_LITTLE_SYM	bfd_elf32_i960_vec
163#define TARGET_LITTLE_NAME	"elf32-i960"
164#define ELF_ARCH		bfd_arch_i960
165#define ELF_MACHINE_CODE	EM_960
166#define ELF_MAXPAGESIZE  	1 /* FIXME: This number is wrong,  It should be the page size in bytes.  */
167
168#include "elf32-target.h"
169