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 static void extra_case PARAMS ((bfd *, struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *));
  32 static void reloc_processing PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));
  33 static void rtype2howto PARAMS ((arelent *, struct internal_reloc *));
  34 static int coff_z8k_select_reloc PARAMS ((reloc_howto_type *));
  35
  36 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
  37
  38 static reloc_howto_type r_imm32 =
  39 HOWTO (R_IMM32, 0, 2, 32, false, 0,
  40        complain_overflow_bitfield, 0, "r_imm32", true, 0xffffffff,
  41        0xffffffff, false);
  42
  43 static reloc_howto_type r_imm4l =
  44 HOWTO (R_IMM4L, 0, 0, 4, false, 0,
  45        complain_overflow_bitfield, 0, "r_imm4l", true, 0xf, 0xf, false);
  46
  47 static reloc_howto_type r_da =
  48 HOWTO (R_IMM16, 0, 1, 16, false, 0,
  49        complain_overflow_bitfield, 0, "r_da", true, 0x0000ffff, 0x0000ffff,
  50        false);
  51
  52 static reloc_howto_type r_imm8 =
  53 HOWTO (R_IMM8, 0, 0, 8, false, 0,
  54        complain_overflow_bitfield, 0, "r_imm8", true, 0x000000ff, 0x000000ff,
  55        false);
  56
  57 static reloc_howto_type r_rel16 =
  58 HOWTO (R_REL16, 0, 1, 16, false, 0,
  59        complain_overflow_bitfield, 0, "r_rel16", true, 0x0000ffff, 0x0000ffff,
  60        true);
  61
  62 static reloc_howto_type r_jr =
  63 HOWTO (R_JR, 0, 0, 8, true, 0, complain_overflow_signed, 0,
  64        "r_jr", true, 0, 0, true);
  65
  66 static reloc_howto_type r_disp7 =
  67 HOWTO (R_DISP7, 0, 0, 7, true, 0, complain_overflow_bitfield, 0,
  68        "r_disp7", true, 0, 0, true);
  69
  70 static reloc_howto_type r_callr =
  71 HOWTO (R_CALLR, 0, 1, 12, true, 0, complain_overflow_signed, 0,
  72        "r_callr", true, 0xfff, 0xfff, true);
  73
  74 /* Turn a howto into a reloc number */
  75
  76 static int
  77 coff_z8k_select_reloc (howto)
  78      reloc_howto_type *howto;
  79 {
  80   return howto->type;
  81 }
  82
  83 #define SELECT_RELOC(x,howto) x.r_type = coff_z8k_select_reloc(howto)
  84
  85 #define BADMAG(x) Z8KBADMAG(x)
  86 #define Z8K 1                   /* Customize coffcode.h */
  87 #define __A_MAGIC_SET__
  88
  89 /* Code to swap in the reloc.  */
  90 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  91 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  92 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  93   dst->r_stuff[0] = 'S'; \
  94   dst->r_stuff[1] = 'C';
  95
  96 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  97
  98 static void
  99 rtype2howto (internal, dst)
 100      arelent * internal;
 101      struct internal_reloc *dst;
 102 {
 103   switch (dst->r_type)
 104     {
 105     default:
 106       abort ();
 107       break;
 108     case R_IMM8:
 109       internal->howto = &r_imm8;
 110       break;
 111      case R_IMM16:
 112       internal->howto = &r_da;
 113       break;
 114     case R_JR:
 115       internal->howto = &r_jr;
 116       break;
 117     case R_DISP7:
 118       internal->howto = &r_disp7;
 119       break;
 120     case R_CALLR:
 121       internal->howto = &r_callr;
 122       break;
 123     case R_REL16:
 124       internal->howto = &r_rel16;
 125       break;
 126     case R_IMM32:
 127       internal->howto = &r_imm32;
 128       break;
 129     case R_IMM4L:
 130       internal->howto = &r_imm4l;
 131       break;
 132     }
 133 }
 134
 135 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
 136
 137 /* Perform any necessary magic to the addend in a reloc entry.  */
 138
 139 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 140  cache_ptr->addend =  ext_reloc.r_offset;
 141
 142 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 143  reloc_processing(relent, reloc, symbols, abfd, section)
 144
 145 static void
 146 reloc_processing (relent, reloc, symbols, abfd, section)
 147      arelent * relent;
 148      struct internal_reloc * reloc;
 149      asymbol ** symbols;
 150      bfd * abfd;
 151      asection * section;
 152 {
 153   relent->address = reloc->r_vaddr;
 154   rtype2howto (relent, reloc);
 155
 156   if (reloc->r_symndx > 0)
 157     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 158   else
 159     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 160
 161   relent->addend = reloc->r_offset;
 162   relent->address -= section->vma;
 163 }
 164
 165 static void
 166 extra_case (in_abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr)
 167      bfd * in_abfd;
 168      struct bfd_link_info * link_info;
 169      struct bfd_link_order * link_order;
 170      arelent * reloc;
 171      bfd_byte * data;
 172      unsigned int * src_ptr;
 173      unsigned int * dst_ptr;
 174 {
 175   asection * input_section = link_order->u.indirect.section;
 176
 177   switch (reloc->howto->type)
 178     {
 179     case R_IMM8:
 180       bfd_put_8 (in_abfd,
 181                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 182                  data + *dst_ptr);
 183       (*dst_ptr) += 1;
 184       (*src_ptr) += 1;
 185       break;
 186
 187     case R_IMM32:
 188       bfd_put_32 (in_abfd,
 189                   /* 0x80000000 indicates a long segmented address.  */
 190                   bfd_coff_reloc16_get_value (reloc, link_info, input_section) | 0x80000000,
 191                   data + *dst_ptr);
 192       (*dst_ptr) += 4;
 193       (*src_ptr) += 4;
 194       break;
 195
 196     case R_IMM4L:
 197       bfd_put_8 (in_abfd,
 198                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 199                   | (0x0f
 200                      & bfd_coff_reloc16_get_value (reloc, link_info,
 201                                                    input_section))),
 202                  data + *dst_ptr);
 203       (*dst_ptr) += 1;
 204       (*src_ptr) += 1;
 205       break;
 206
 207     case R_IMM16:
 208       bfd_put_16 (in_abfd,
 209                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 210                   data + *dst_ptr);
 211       (*dst_ptr) += 2;
 212       (*src_ptr) += 2;
 213       break;
 214
 215     case R_JR:
 216       {
 217         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 218                                                   input_section);
 219         bfd_vma dot = (link_order->offset
 220                        + *dst_ptr
 221                        + input_section->output_section->vma);
 222         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 223                                      word and the pc's been incremented.  */
 224
 225         if (gap & 1)
 226           abort ();
 227         gap /= 2;
 228         if (gap > 128 || gap < -128)
 229           {
 230             if (! ((*link_info->callbacks->reloc_overflow)
 231                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 232                     reloc->howto->name, reloc->addend, input_section->owner,
 233                     input_section, reloc->address)))
 234               abort ();
 235           }
 236         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 237         (*dst_ptr)++;
 238         (*src_ptr)++;
 239         break;
 240       }
 241
 242     case R_DISP7:
 243       {
 244         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 245                                                   input_section);
 246         bfd_vma dot = (link_order->offset
 247                        + *dst_ptr
 248                        + input_section->output_section->vma);
 249         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 250                                      word and the pc's been incremented.  */
 251
 252         if (gap & 1)
 253           abort ();
 254         gap /= 2;
 255
 256         if (gap > 0 || gap < -128)
 257           {
 258             if (! ((*link_info->callbacks->reloc_overflow)
 259                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 260                     reloc->howto->name, reloc->addend, input_section->owner,
 261                     input_section, reloc->address)))
 262               abort ();
 263           }
 264         bfd_put_8 (in_abfd,
 265                    (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
 266                    data + *dst_ptr);
 267         (*dst_ptr)++;
 268         (*src_ptr)++;
 269         break;
 270       }
 271
 272     case R_CALLR:
 273       {
 274         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 275                                                   input_section);
 276         bfd_vma dot = (link_order->offset
 277                        + *dst_ptr
 278                        + input_section->output_section->vma);
 279         int gap = dst - dot - 2;
 280
 281         if (gap & 1)
 282           abort ();
 283         gap /= 2;
 284         if (gap > 8191 || gap < -8192)
 285           {
 286             if (! ((*link_info->callbacks->reloc_overflow)
 287                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 288                     reloc->howto->name, reloc->addend, input_section->owner,
 289                     input_section, reloc->address)))
 290               abort ();
 291           }
 292         bfd_put_16 (in_abfd,
 293                     (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
 294                     data + *dst_ptr);
 295         (*dst_ptr) += 2;
 296         (*src_ptr) += 2;
 297         break;
 298       }
 299
 300     case R_REL16:
 301       {
 302         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 303                                                   input_section);
 304         bfd_vma dot = (link_order->offset
 305                        + *dst_ptr
 306                        + input_section->output_section->vma);
 307         int gap = dst - dot - 2;
 308
 309         if (gap > 32767 || gap < -32768)
 310           {
 311             if (! ((*link_info->callbacks->reloc_overflow)
 312                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 313                     reloc->howto->name, reloc->addend, input_section->owner,
 314                     input_section, reloc->address)))
 315               abort ();
 316           }
 317         bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
 318         (*dst_ptr) += 2;
 319         (*src_ptr) += 2;
 320         break;
 321       }
 322
 323     default:
 324       abort ();
 325     }
 326 }
 327
 328 #define coff_reloc16_extra_cases extra_case
 329
 330 #include "coffcode.h"
 331
 332 #undef  coff_bfd_get_relocated_section_contents
 333 #undef coff_bfd_relax_section
 334 #define coff_bfd_get_relocated_section_contents \
 335   bfd_coff_reloc16_get_relocated_section_contents
 336 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 337
 338 CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL)