bfd/elf32-i960.c

   1 /* Intel 860 specific support for 32-bit ELF
   2    Copyright 1999 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
  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
  37 static 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
  55 static enum elf_i960_reloc_type
  56 elf32_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
  72 static void
  73 elf32_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
  81 static void
  82 elf32_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*/
 106 bfd_reloc_status_type
 107 elf32_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
 154 static reloc_howto_type *
 155 elf32_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"