bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright 1992, 93, 94, 95, 1997 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   4    Written by Steve Chamberlain, <sac@cygnus.com>.
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #include "bfd.h"
  23 #include "sysdep.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26 #include "coff/z8k.h"
  27 #include "coff/internal.h"
  28 #include "libcoff.h"
  29
  30 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  31
  32 static reloc_howto_type r_imm32 =
  33 HOWTO (R_IMM32, 0, 1, 32, false, 0,
  34        complain_overflow_bitfield, 0, "r_imm32", true, 0xffffffff,
  35        0xffffffff, false);
  36
  37 static reloc_howto_type r_imm4l =
  38 HOWTO (R_IMM4L, 0, 1, 4, false, 0,
  39        complain_overflow_bitfield, 0, "r_imm4l", true, 0xf, 0xf, false);
  40
  41 static reloc_howto_type r_da =
  42 HOWTO (R_IMM16, 0, 1, 16, false, 0,
  43        complain_overflow_bitfield, 0, "r_da", true, 0x0000ffff, 0x0000ffff,
  44        false);
  45
  46 static reloc_howto_type r_imm8 =
  47 HOWTO (R_IMM8, 0, 1, 8, false, 0,
  48        complain_overflow_bitfield, 0, "r_imm8", true, 0x000000ff, 0x000000ff,
  49        false);
  50
  51 static reloc_howto_type r_jr =
  52 HOWTO (R_JR, 0, 1, 8, true, 0, complain_overflow_signed, 0,
  53        "r_jr", true, 0, 0, true);
  54
  55 /* Turn a howto into a reloc number */
  56
  57 static int
  58 coff_z8k_select_reloc (howto)
  59      reloc_howto_type *howto;
  60 {
  61   return howto->type;
  62 }
  63
  64 #define SELECT_RELOC(x,howto) x.r_type = coff_z8k_select_reloc(howto)
  65
  66 #define BADMAG(x) Z8KBADMAG(x)
  67 #define Z8K 1                   /* Customize coffcode.h */
  68 #define __A_MAGIC_SET__
  69
  70 /* Code to swap in the reloc */
  71 #define SWAP_IN_RELOC_OFFSET   bfd_h_get_32
  72 #define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
  73 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  74   dst->r_stuff[0] = 'S'; \
  75   dst->r_stuff[1] = 'C';
  76
  77 /* Code to turn a r_type into a howto ptr, uses the above howto table
  78    */
  79
  80 static void
  81 rtype2howto (internal, dst)
  82      arelent * internal;
  83      struct internal_reloc *dst;
  84 {
  85   switch (dst->r_type)
  86     {
  87     default:
  88       abort ();
  89       break;
  90     case R_IMM8:
  91       internal->howto = &r_imm8;
  92       break;
  93      case R_IMM16:
  94       internal->howto = &r_da;
  95       break;
  96     case R_JR:
  97       internal->howto = &r_jr;
  98       break;
  99     case R_IMM32:
 100       internal->howto = &r_imm32;
 101       break;
 102     case R_IMM4L:
 103       internal->howto = &r_imm4l;
 104       break;
 105     }
 106 }
 107
 108 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
 109
 110 /* Perform any necessary magic to the addend in a reloc entry */
 111
 112 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 113  cache_ptr->addend =  ext_reloc.r_offset;
 114
 115 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 116  reloc_processing(relent, reloc, symbols, abfd, section)
 117
 118 static void
 119 reloc_processing (relent, reloc, symbols, abfd, section)
 120      arelent * relent;
 121      struct internal_reloc *reloc;
 122      asymbol ** symbols;
 123      bfd * abfd;
 124      asection * section;
 125 {
 126   relent->address = reloc->r_vaddr;
 127   rtype2howto (relent, reloc);
 128
 129   if (reloc->r_symndx > 0)
 130     {
 131       relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 132     }
 133   else
 134     {
 135       relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 136     }
 137
 138   relent->addend = reloc->r_offset;
 139   relent->address -= section->vma;
 140 }
 141
 142 static void
 143 extra_case (in_abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr)
 144      bfd *in_abfd;
 145      struct bfd_link_info *link_info;
 146      struct bfd_link_order *link_order;
 147      arelent *reloc;
 148      bfd_byte *data;
 149      unsigned int *src_ptr;
 150      unsigned int *dst_ptr;
 151 {
 152   asection *input_section = link_order->u.indirect.section;
 153
 154   switch (reloc->howto->type)
 155     {
 156     case R_IMM8:
 157       bfd_put_8 (in_abfd,
 158                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 159                  data + *dst_ptr);
 160       (*dst_ptr) += 1;
 161       (*src_ptr) += 1;
 162       break;
 163
 164     case R_IMM32:
 165       bfd_put_32 (in_abfd,
 166                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 167                   data + *dst_ptr);
 168       (*dst_ptr) += 4;
 169       (*src_ptr) += 4;
 170       break;
 171
 172     case R_IMM4L:
 173       bfd_put_8 (in_abfd,
 174                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 175                   | (0x0f
 176                      & bfd_coff_reloc16_get_value (reloc, link_info,
 177                                                    input_section))),
 178                  data + *dst_ptr);
 179       (*dst_ptr) += 1;
 180       (*src_ptr) += 1;
 181       break;
 182
 183     case R_IMM16:
 184       bfd_put_16 (in_abfd,
 185                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 186                   data + *dst_ptr);
 187       (*dst_ptr) += 2;
 188       (*src_ptr) += 2;
 189       break;
 190
 191     case R_JR:
 192       {
 193         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 194                                                   input_section);
 195         bfd_vma dot = (link_order->offset
 196                        + *dst_ptr
 197                        + input_section->output_section->vma);
 198         int gap = dst - dot - 1;/* -1 since were in the odd byte of the
 199                                     word and the pc's been incremented */
 200
 201         if (gap & 1)
 202           abort ();
 203         gap /= 2;
 204         if (gap > 128 || gap < -128)
 205           {
 206             if (! ((*link_info->callbacks->reloc_overflow)
 207                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 208                     reloc->howto->name, reloc->addend, input_section->owner,
 209                     input_section, reloc->address)))
 210               abort ();
 211           }
 212         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 213         (*dst_ptr)++;
 214         (*src_ptr)++;
 215         break;
 216       }
 217     default:
 218       abort ();
 219     }
 220 }
 221
 222 #define coff_reloc16_extra_cases extra_case
 223
 224 #include "coffcode.h"
 225
 226 #undef  coff_bfd_get_relocated_section_contents
 227 #undef coff_bfd_relax_section
 228 #define coff_bfd_get_relocated_section_contents \
 229   bfd_coff_reloc16_get_relocated_section_contents
 230 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 231
 232 CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL)