bfd/elf32-i960.c

   1 /* Intel 860 specific support for 32-bit ELF
   2    Copyright 1999, 2000, 2001, 2002 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 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
 109 bfd_reloc_status_type
 110 elf32_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
 157 static reloc_howto_type *
 158 elf32_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"