bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002
   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       /* If no flags are set, assume immediate value.  */
 189       if (! (*reloc->sym_ptr_ptr)->section->flags)
 190         {
 191           bfd_put_32 (in_abfd,
 192                       bfd_coff_reloc16_get_value (reloc, link_info,
 193                                                   input_section),
 194                       data + *dst_ptr);
 195         }
 196       else
 197         {
 198           bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 199                                                     input_section);
 200           /* Adresses are 23 bit, and the layout of those in a 32-bit
 201              value is as follows:
 202                1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
 203              (A - address bits,  x - ignore).  */
 204           dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
 205           bfd_put_32 (in_abfd, dst, data + *dst_ptr);
 206         }
 207       (*dst_ptr) += 4;
 208       (*src_ptr) += 4;
 209       break;
 210
 211     case R_IMM4L:
 212       bfd_put_8 (in_abfd,
 213                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 214                   | (0x0f
 215                      & bfd_coff_reloc16_get_value (reloc, link_info,
 216                                                    input_section))),
 217                  data + *dst_ptr);
 218       (*dst_ptr) += 1;
 219       (*src_ptr) += 1;
 220       break;
 221
 222     case R_IMM16:
 223       bfd_put_16 (in_abfd,
 224                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 225                   data + *dst_ptr);
 226       (*dst_ptr) += 2;
 227       (*src_ptr) += 2;
 228       break;
 229
 230     case R_JR:
 231       {
 232         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 233                                                   input_section);
 234         bfd_vma dot = (link_order->offset
 235                        + *dst_ptr
 236                        + input_section->output_section->vma);
 237         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 238                                      word and the pc's been incremented.  */
 239
 240         if (gap & 1)
 241           abort ();
 242         gap /= 2;
 243         if (gap > 128 || gap < -128)
 244           {
 245             if (! ((*link_info->callbacks->reloc_overflow)
 246                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 247                     reloc->howto->name, reloc->addend, input_section->owner,
 248                     input_section, reloc->address)))
 249               abort ();
 250           }
 251         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 252         (*dst_ptr)++;
 253         (*src_ptr)++;
 254         break;
 255       }
 256
 257     case R_DISP7:
 258       {
 259         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 260                                                   input_section);
 261         bfd_vma dot = (link_order->offset
 262                        + *dst_ptr
 263                        + input_section->output_section->vma);
 264         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 265                                      word and the pc's been incremented.  */
 266
 267         if (gap & 1)
 268           abort ();
 269         gap /= 2;
 270
 271         if (gap > 0 || gap < -127)
 272           {
 273             if (! ((*link_info->callbacks->reloc_overflow)
 274                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 275                     reloc->howto->name, reloc->addend, input_section->owner,
 276                     input_section, reloc->address)))
 277               abort ();
 278           }
 279         bfd_put_8 (in_abfd,
 280                    (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
 281                    data + *dst_ptr);
 282         (*dst_ptr)++;
 283         (*src_ptr)++;
 284         break;
 285       }
 286
 287     case R_CALLR:
 288       {
 289         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 290                                                   input_section);
 291         bfd_vma dot = (link_order->offset
 292                        + *dst_ptr
 293                        + input_section->output_section->vma);
 294         int gap = dst - dot - 2;
 295
 296         if (gap & 1)
 297           abort ();
 298         if (gap > 4096 || gap < -4095)
 299           {
 300             if (! ((*link_info->callbacks->reloc_overflow)
 301                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 302                     reloc->howto->name, reloc->addend, input_section->owner,
 303                     input_section, reloc->address)))
 304               abort ();
 305           }
 306         gap /= 2;
 307         bfd_put_16 (in_abfd,
 308                     (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
 309                     data + *dst_ptr);
 310         (*dst_ptr) += 2;
 311         (*src_ptr) += 2;
 312         break;
 313       }
 314
 315     case R_REL16:
 316       {
 317         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 318                                                   input_section);
 319         bfd_vma dot = (link_order->offset
 320                        + *dst_ptr
 321                        + input_section->output_section->vma);
 322         int gap = dst - dot - 2;
 323
 324         if (gap > 32767 || gap < -32768)
 325           {
 326             if (! ((*link_info->callbacks->reloc_overflow)
 327                    (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 328                     reloc->howto->name, reloc->addend, input_section->owner,
 329                     input_section, reloc->address)))
 330               abort ();
 331           }
 332         bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
 333         (*dst_ptr) += 2;
 334         (*src_ptr) += 2;
 335         break;
 336       }
 337
 338     default:
 339       abort ();
 340     }
 341 }
 342
 343 #define coff_reloc16_extra_cases extra_case
 344
 345 #include "coffcode.h"
 346
 347 #undef  coff_bfd_get_relocated_section_contents
 348 #undef coff_bfd_relax_section
 349 #define coff_bfd_get_relocated_section_contents \
 350   bfd_coff_reloc16_get_relocated_section_contents
 351 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 352
 353 CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)