bfd/elf32-i960.c

   1 /* Intel 960 specific support for 32-bit ELF
   2    Copyright 1999, 2000, 2001, 2002, 2003 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., 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
  26 static bfd_reloc_status_type elf32_i960_relocate
  27   PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
  28 static reloc_howto_type *elf32_i960_reloc_type_lookup
  29   PARAMS ((bfd *, bfd_reloc_code_real_type));
  30 static void elf32_i960_info_to_howto
  31   PARAMS ((bfd *, arelent *cache_ptr, Elf_Internal_Rela *));
  32 static 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
  41 static 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
  59 static enum elf_i960_reloc_type
  60 elf32_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
  76 static void
  77 elf32_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
  85 static void
  86 elf32_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 relocatable
 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    relocatable output against an external symbol.  */
 108
 109 bfd_reloc_status_type
 110 elf32_i960_relocate (abfd, reloc_entry, symbol, data, input_section,
 111                      output_bfd, error_message)
 112      bfd *abfd ATTRIBUTE_UNUSED;
 113      arelent *reloc_entry;
 114      asymbol *symbol;
 115      PTR data ATTRIBUTE_UNUSED;
 116      asection *input_section;
 117      bfd *output_bfd;
 118      char **error_message ATTRIBUTE_UNUSED;
 119 {
 120   /* HACK: I think this first condition is necessary when producing
 121      relocatable output.  After the end of HACK, the code is identical
 122      to bfd_elf_generic_reloc().  I would _guess_ the first change
 123      belongs there rather than here.  martindo 1998-10-23.  */
 124   if (output_bfd != (bfd *) NULL
 125       && reloc_entry->howto->pc_relative
 126       && !reloc_entry->howto->pcrel_offset)
 127     {
 128       reloc_entry->addend -= symbol->value;
 129     }
 130   /* This is more dubious.  */
 131   else if (output_bfd != (bfd *) NULL
 132            && (symbol->flags & BSF_SECTION_SYM) != 0)
 133     {
 134       reloc_entry->addend -= symbol->section->output_section->vma;
 135     }
 136   else
 137     {
 138       /* end of HACK */
 139       if (output_bfd != (bfd *) NULL
 140           && (symbol->flags & BSF_SECTION_SYM) == 0
 141           && (! reloc_entry->howto->partial_inplace
 142               || reloc_entry->addend == 0))
 143         {
 144           reloc_entry->address += input_section->output_offset;
 145           return bfd_reloc_ok;
 146         }
 147     }
 148
 149   return bfd_reloc_continue;
 150 }
 151
 152 static reloc_howto_type *
 153 elf32_i960_reloc_type_lookup (abfd, code)
 154      bfd *abfd ATTRIBUTE_UNUSED;
 155      bfd_reloc_code_real_type code;
 156 {
 157   return elf_howto_table + elf32_i960_bfd_to_reloc_type (code);
 158 }
 159
 160 #define TARGET_LITTLE_SYM       bfd_elf32_i960_vec
 161 #define TARGET_LITTLE_NAME      "elf32-i960"
 162 #define ELF_ARCH                bfd_arch_i960
 163 #define ELF_MACHINE_CODE        EM_960
 164 #define ELF_MAXPAGESIZE         1 /* FIXME: This number is wrong,  It should be the page size in bytes.  */
 165
 166 #include "elf32-target.h"