bfd/elf32-i960.c

   1 /* Intel 960 specific support for 32-bit ELF
   2    Copyright 1999, 2000, 2001, 2002, 2003, 2005, 2007
   3    Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25 #include "elf-bfd.h"
  26 #include "elf/i960.h"
  27
  28 #define USE_REL 1
  29
  30 #define bfd_elf32_bfd_reloc_type_lookup elf32_i960_reloc_type_lookup
  31 #define bfd_elf32_bfd_reloc_name_lookup \
  32   elf32_i960_reloc_name_lookup
  33 #define elf_info_to_howto               elf32_i960_info_to_howto
  34 #define elf_info_to_howto_rel           elf32_i960_info_to_howto_rel
  35
  36 /* ELF relocs are against symbols.  If we are producing relocatable
  37    output, and the reloc is against an external symbol, and nothing
  38    has given us any additional addend, the resulting reloc will also
  39    be against the same symbol.  In such a case, we don't want to
  40    change anything about the way the reloc is handled, since it will
  41    all be done at final link time.  Rather than put special case code
  42    into bfd_perform_relocation, all the reloc types use this howto
  43    function.  It just short circuits the reloc if producing
  44    relocatable output against an external symbol.  */
  45
  46 static bfd_reloc_status_type
  47 elf32_i960_relocate (bfd *abfd ATTRIBUTE_UNUSED,
  48                      arelent *reloc_entry,
  49                      asymbol *symbol,
  50                      PTR data ATTRIBUTE_UNUSED,
  51                      asection *input_section,
  52                      bfd *output_bfd,
  53                      char **error_message ATTRIBUTE_UNUSED)
  54 {
  55   /* HACK: I think this first condition is necessary when producing
  56      relocatable output.  After the end of HACK, the code is identical
  57      to bfd_elf_generic_reloc().  I would _guess_ the first change
  58      belongs there rather than here.  martindo 1998-10-23.  */
  59   if (output_bfd != (bfd *) NULL
  60       && reloc_entry->howto->pc_relative
  61       && !reloc_entry->howto->pcrel_offset)
  62     reloc_entry->addend -= symbol->value;
  63
  64   /* This is more dubious.  */
  65   else if (output_bfd != (bfd *) NULL
  66            && (symbol->flags & BSF_SECTION_SYM) != 0)
  67     reloc_entry->addend -= symbol->section->output_section->vma;
  68
  69   else
  70     {
  71       /* ...end of HACK.  */
  72       if (output_bfd != (bfd *) NULL
  73           && (symbol->flags & BSF_SECTION_SYM) == 0
  74           && (! reloc_entry->howto->partial_inplace
  75               || reloc_entry->addend == 0))
  76         {
  77           reloc_entry->address += input_section->output_offset;
  78           return bfd_reloc_ok;
  79         }
  80     }
  81
  82   return bfd_reloc_continue;
  83 }
  84
  85 static reloc_howto_type elf_howto_table[]=
  86 {
  87   HOWTO (R_960_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
  88          elf32_i960_relocate, "R_960_NONE", TRUE,
  89          0x00000000, 0x00000000, FALSE),
  90   EMPTY_HOWTO (1),
  91   HOWTO (R_960_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
  92          elf32_i960_relocate, "R_960_32", TRUE,
  93          0xffffffff, 0xffffffff, FALSE),
  94   HOWTO (R_960_IP24, 0, 2, 24, TRUE, 0, complain_overflow_signed,
  95          elf32_i960_relocate, "R_960_IP24 ", TRUE,
  96          0x00ffffff, 0x00ffffff, FALSE),
  97   EMPTY_HOWTO (4),
  98   EMPTY_HOWTO (5),
  99   EMPTY_HOWTO (6),
 100   EMPTY_HOWTO (7)
 101 };
 102
 103 static enum elf_i960_reloc_type
 104 elf32_i960_bfd_to_reloc_type (bfd_reloc_code_real_type code)
 105 {
 106   switch (code)
 107     {
 108     default:
 109       return R_960_NONE;
 110     case BFD_RELOC_I960_CALLJ:
 111       return R_960_OPTCALL;
 112     case BFD_RELOC_32:
 113     case BFD_RELOC_CTOR:
 114       return R_960_32;
 115     case BFD_RELOC_24_PCREL:
 116       return R_960_IP24;
 117     }
 118 }
 119
 120 static void
 121 elf32_i960_info_to_howto (bfd *               abfd ATTRIBUTE_UNUSED,
 122                           arelent *           cache_ptr ATTRIBUTE_UNUSED,
 123                           Elf_Internal_Rela * dst ATTRIBUTE_UNUSED)
 124 {
 125   abort ();
 126 }
 127
 128 static void
 129 elf32_i960_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
 130                               arelent *cache_ptr,
 131                               Elf_Internal_Rela *dst)
 132 {
 133   enum elf_i960_reloc_type type;
 134
 135   type = (enum elf_i960_reloc_type) ELF32_R_TYPE (dst->r_info);
 136   BFD_ASSERT (type < R_960_max);
 137
 138   cache_ptr->howto = &elf_howto_table[(int) type];
 139 }
 140
 141 static reloc_howto_type *
 142 elf32_i960_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 143                               bfd_reloc_code_real_type code)
 144 {
 145   return elf_howto_table + elf32_i960_bfd_to_reloc_type (code);
 146 }
 147
 148 static reloc_howto_type *
 149 elf32_i960_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 150                               const char *r_name)
 151 {
 152   unsigned int i;
 153
 154   for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
 155     if (elf_howto_table[i].name != NULL
 156         && strcasecmp (elf_howto_table[i].name, r_name) == 0)
 157       return &elf_howto_table[i];
 158
 159   return NULL;
 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"