bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4    Contributed by Cygnus Support.
   5    Written by Steve Chamberlain, <sac@cygnus.com>.
   6
   7 This file is part of BFD, the Binary File Descriptor library.
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program; if not, write to the Free Software
  21 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  22
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "libbfd.h"
  26 #include "bfdlink.h"
  27 #include "coff/z8k.h"
  28 #include "coff/internal.h"
  29 #include "libcoff.h"
  30
  31 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  32
  33 static reloc_howto_type r_imm32 =
  34 HOWTO (R_IMM32, 0, 2, 32, false, 0,
  35        complain_overflow_bitfield, 0, "r_imm32", true, 0xffffffff,
  36        0xffffffff, false);
  37
  38 static reloc_howto_type r_imm4l =
  39 HOWTO (R_IMM4L, 0, 0, 4, false, 0,
  40        complain_overflow_bitfield, 0, "r_imm4l", true, 0xf, 0xf, false);
  41
  42 static reloc_howto_type r_da =
  43 HOWTO (R_IMM16, 0, 1, 16, false, 0,
  44        complain_overflow_bitfield, 0, "r_da", true, 0x0000ffff, 0x0000ffff,
  45        false);
  46
  47 static reloc_howto_type r_imm8 =
  48 HOWTO (R_IMM8, 0, 0, 8, false, 0,
  49        complain_overflow_bitfield, 0, "r_imm8", true, 0x000000ff, 0x000000ff,
  50        false);
  51
  52 static reloc_howto_type r_rel16 =
  53 HOWTO (R_REL16, 0, 1, 16, false, 0,
  54        complain_overflow_bitfield, 0, "r_rel16", true, 0x0000ffff, 0x0000ffff,
  55        true);
  56
  57 static reloc_howto_type r_jr =
  58 HOWTO (R_JR, 0, 0, 8, true, 0, complain_overflow_signed, 0,
  59        "r_jr", true, 0, 0, true);
  60
  61 static reloc_howto_type r_disp7 =
  62 HOWTO (R_DISP7, 0, 0, 7, true, 0, complain_overflow_bitfield, 0,
  63        "r_disp7", true, 0, 0, true);
  64
  65 static reloc_howto_type r_callr =
  66 HOWTO (R_CALLR, 0, 1, 12, true, 0, complain_overflow_signed, 0,
  67        "r_callr", true, 0xfff, 0xfff, true);
  68
  69 /* Turn a howto into a reloc number */
  70
  71 static int
  72 coff_z8k_select_reloc (howto)
  73      reloc_howto_type *howto;
  74 {
  75   return howto->type;
  76 }
  77
  78 #define SELECT_RELOC(x,howto) x.r_type = coff_z8k_select_reloc(howto)
  79
  80 #define BADMAG(x) Z8KBADMAG(x)
  81 #define Z8K 1                   /* Customize coffcode.h */
  82 #define __A_MAGIC_SET__
  83
  84 /* Code to swap in the reloc */
  85 #define SWAP_IN_RELOC_OFFSET   bfd_h_get_32
  86 #define SWAP_OUT_RELOC_OFFSET bfd_h_put_32
  87 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  88   dst->r_stuff[0] = 'S'; \
  89   dst->r_stuff[1] = 'C';
  90
  91 /* Code to turn a r_type into a howto ptr, uses the above howto table
  92    */
  93
  94 static void
  95 rtype2howto (internal, dst)
  96      arelent * internal;
  97      struct internal_reloc *dst;
  98 {
  99   switch (dst->r_type)
 100     {
 101     default:
 102       abort ();
 103       break;
 104     case R_IMM8:
 105       internal->howto = &r_imm8;
 106       break;
 107      case R_IMM16:
 108       internal->howto = &r_da;
 109       break;
 110     case R_JR:
 111       internal->howto = &r_jr;
 112       break;
 113     case R_DISP7:
 114       internal->howto = &r_disp7;
 115       break;
 116     case R_CALLR:
 117       internal->howto = &r_callr;
 118       break;
 119     case R_REL16:
 120       internal->howto = &r_rel16;
 121       break;
 122     case R_IMM32:
 123       internal->howto = &r_imm32;
 124       break;
 125     case R_IMM4L:
 126       internal->howto = &r_imm4l;
 127       break;
 128     }
 129 }
 130
 131 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry)
 132
 133 /* Perform any necessary magic to the addend in a reloc entry */
 134
 135 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 136  cache_ptr->addend =  ext_reloc.r_offset;
 137
 138 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 139  reloc_processing(relent, reloc, symbols, abfd, section)
 140
 141 static void
 142 reloc_processing (relent, reloc, symbols, abfd, section)
 143      arelent * relent;
 144      struct internal_reloc * reloc;
 145      asymbol ** symbols;
 146      bfd * abfd;
 147      asection * section;
 148 {
 149   relent->address = reloc->r_vaddr;
 150   rtype2howto (relent, reloc);
 151
 152   if (reloc->r_symndx > 0)
 153     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 154   else
 155     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 156
 157   relent->addend = reloc->r_offset;
 158   relent->address -= section->vma;
 159 }
 160
 161 static void
 162 extra_case (in_abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr)
 163      bfd * in_abfd;
 164      struct bfd_link_info * link_info;
 165      struct bfd_link_order * link_order;
 166      arelent * reloc;
 167      bfd_byte * data;
 168      unsigned int * src_ptr;
 169      unsigned int * dst_ptr;
 170 {
 171   asection * input_section = link_order->u.indirect.section;
 172
 173   switch (reloc->howto->type)
 174     {
 175     case R_IMM8:
 176       bfd_put_8 (in_abfd,
 177                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 178                  data + *dst_ptr);
 179       (*dst_ptr) += 1;
 180       (*src_ptr) += 1;
 181       break;
 182
 183     case R_IMM32:
 184       bfd_put_32 (in_abfd,
 185                   /* 0x80000000 indicates a long segmented address.  */
 186                   bfd_coff_reloc16_get_value (reloc, link_info, input_section) | 0x80000000,
 187                   data + *dst_ptr);
 188       (*dst_ptr) += 4;
 189       (*src_ptr) += 4;
 190       break;
 191
 192     case R_IMM4L:
 193       bfd_put_8 (in_abfd,
 194                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 195                   | (0x0f
 196                      & bfd_coff_reloc16_get_value (reloc, link_info,
 197                                                    input_section))),
 198                  data + *dst_ptr);
 199       (*dst_ptr) += 1;
 200       (*src_ptr) += 1;
 201       break;
 202
 203     case R_IMM16:
 204       bfd_put_16 (in_abfd,
 205                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 206                   data + *dst_ptr);
 207       (*dst_ptr) += 2;
 208       (*src_ptr) += 2;
 209       break;
 210
 211     case R_JR:
 212       {
 213         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 214                                                   input_section);
 215         bfd_vma dot = (link_order->offset
 216                        + *dst_ptr
 217                        + input_section->output_section->vma);
 218         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 219                                      word and the pc's been incremented.  */
 220
 221         if (gap & 1)
 222           abort ();
 223         gap /= 2;
 224         if (gap > 128 || gap < -128)
 225           {
 226             if (! ((*link_info->callbacks->reloc_overflow)
 227                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 228                     reloc->howto->name, reloc->addend, input_section->owner,
 229                     input_section, reloc->address)))
 230               abort ();
 231           }
 232         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 233         (*dst_ptr)++;
 234         (*src_ptr)++;
 235         break;
 236       }
 237
 238     case R_DISP7:
 239       {
 240         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 241                                                   input_section);
 242         bfd_vma dot = (link_order->offset
 243                        + *dst_ptr
 244                        + input_section->output_section->vma);
 245         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 246                                      word and the pc's been incremented.  */
 247
 248         if (gap & 1)
 249           abort ();
 250         gap /= 2;
 251
 252         if (gap > 0 || gap < -128)
 253           {
 254             if (! ((*link_info->callbacks->reloc_overflow)
 255                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 256                     reloc->howto->name, reloc->addend, input_section->owner,
 257                     input_section, reloc->address)))
 258               abort ();
 259           }
 260         bfd_put_8 (in_abfd,
 261                    (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
 262                    data + *dst_ptr);
 263         (*dst_ptr)++;
 264         (*src_ptr)++;
 265         break;
 266       }
 267
 268     case R_CALLR:
 269       {
 270         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 271                                                   input_section);
 272         bfd_vma dot = (link_order->offset
 273                        + *dst_ptr
 274                        + input_section->output_section->vma);
 275         int gap = dst - dot - 2;
 276
 277         if (gap & 1)
 278           abort ();
 279         gap /= 2;
 280         if (gap > 8191 || gap < -8192)
 281           {
 282             if (! ((*link_info->callbacks->reloc_overflow)
 283                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 284                     reloc->howto->name, reloc->addend, input_section->owner,
 285                     input_section, reloc->address)))
 286               abort ();
 287           }
 288         bfd_put_16 (in_abfd,
 289                     (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
 290                     data + *dst_ptr);
 291         (*dst_ptr) += 2;
 292         (*src_ptr) += 2;
 293         break;
 294       }
 295
 296     case R_REL16:
 297       {
 298         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 299                                                   input_section);
 300         bfd_vma dot = (link_order->offset
 301                        + *dst_ptr
 302                        + input_section->output_section->vma);
 303         int gap = dst - dot - 2;
 304
 305         if (gap > 32767 || gap < -32768)
 306           {
 307             if (! ((*link_info->callbacks->reloc_overflow)
 308                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 309                     reloc->howto->name, reloc->addend, input_section->owner,
 310                     input_section, reloc->address)))
 311               abort ();
 312           }
 313         bfd_put_16 (in_abfd,gap,data + *dst_ptr);
 314         (*dst_ptr) += 2;
 315         (*src_ptr) += 2;
 316         break;
 317       }
 318
 319     default:
 320       abort ();
 321     }
 322 }
 323
 324 #define coff_reloc16_extra_cases extra_case
 325
 326 #include "coffcode.h"
 327
 328 #undef  coff_bfd_get_relocated_section_contents
 329 #undef coff_bfd_relax_section
 330 #define coff_bfd_get_relocated_section_contents \
 331   bfd_coff_reloc16_get_relocated_section_contents
 332 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 333
 334 CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL)