bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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, 1, 0, 8, TRUE, 0, complain_overflow_signed, 0,
  59        "r_jr", TRUE, 0xff, 0xff, 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, 0x7f, 0x7f, TRUE);
  64
  65 static reloc_howto_type r_callr =
  66 HOWTO (R_CALLR, 1, 1, 12, TRUE, 0, complain_overflow_signed, 0,
  67        "r_callr", TRUE, 0xfff, 0xfff, TRUE);
  68
  69 #define BADMAG(x) Z8KBADMAG(x)
  70 #define Z8K 1                   /* Customize coffcode.h.  */
  71 #define __A_MAGIC_SET__
  72
  73 /* Code to swap in the reloc.  */
  74 #define SWAP_IN_RELOC_OFFSET    H_GET_32
  75 #define SWAP_OUT_RELOC_OFFSET   H_PUT_32
  76 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  77   dst->r_stuff[0] = 'S'; \
  78   dst->r_stuff[1] = 'C';
  79
  80 /* Code to turn a r_type into a howto ptr, uses the above howto table.  */
  81
  82 static void
  83 rtype2howto (arelent *internal, 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_DISP7:
 100       internal->howto = &r_disp7;
 101       break;
 102     case R_CALLR:
 103       internal->howto = &r_callr;
 104       break;
 105     case R_REL16:
 106       internal->howto = &r_rel16;
 107       break;
 108     case R_IMM32:
 109       internal->howto = &r_imm32;
 110       break;
 111     case R_IMM4L:
 112       internal->howto = &r_imm4l;
 113       break;
 114     }
 115 }
 116
 117 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
 118
 119 static reloc_howto_type *
 120 coff_z8k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 121                             bfd_reloc_code_real_type code)
 122 {
 123   switch (code)
 124     {
 125     case BFD_RELOC_8:           return & r_imm8;
 126     case BFD_RELOC_16:          return & r_da;
 127     case BFD_RELOC_32:          return & r_imm32;
 128     case BFD_RELOC_8_PCREL:     return & r_jr;
 129     case BFD_RELOC_16_PCREL:    return & r_rel16;
 130     case BFD_RELOC_Z8K_DISP7:   return & r_disp7;
 131     case BFD_RELOC_Z8K_CALLR:   return & r_callr;
 132     case BFD_RELOC_Z8K_IMM4L:   return & r_imm4l;
 133     default:                    BFD_FAIL ();
 134       return 0;
 135     }
 136 }
 137
 138 /* Perform any necessary magic to the addend in a reloc entry.  */
 139
 140 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 141  cache_ptr->addend =  ext_reloc.r_offset;
 142
 143 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 144  reloc_processing(relent, reloc, symbols, abfd, section)
 145
 146 static void
 147 reloc_processing (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 (bfd *in_abfd,
 167             struct bfd_link_info *link_info,
 168             struct bfd_link_order *link_order,
 169             arelent *reloc,
 170             bfd_byte *data,
 171             unsigned int *src_ptr,
 172             unsigned int *dst_ptr)
 173 {
 174   asection * input_section = link_order->u.indirect.section;
 175
 176   switch (reloc->howto->type)
 177     {
 178     case R_IMM8:
 179       bfd_put_8 (in_abfd,
 180                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 181                  data + *dst_ptr);
 182       (*dst_ptr) += 1;
 183       (*src_ptr) += 1;
 184       break;
 185
 186     case R_IMM32:
 187       /* If no flags are set, assume immediate value.  */
 188       if (! (*reloc->sym_ptr_ptr)->section->flags)
 189         {
 190           bfd_put_32 (in_abfd,
 191                       bfd_coff_reloc16_get_value (reloc, link_info,
 192                                                   input_section),
 193                       data + *dst_ptr);
 194         }
 195       else
 196         {
 197           bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 198                                                     input_section);
 199           /* Addresses are 23 bit, and the layout of those in a 32-bit
 200              value is as follows:
 201                1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
 202              (A - address bits,  x - ignore).  */
 203           dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
 204           bfd_put_32 (in_abfd, dst, data + *dst_ptr);
 205         }
 206       (*dst_ptr) += 4;
 207       (*src_ptr) += 4;
 208       break;
 209
 210     case R_IMM4L:
 211       bfd_put_8 (in_abfd,
 212                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 213                   | (0x0f
 214                      & bfd_coff_reloc16_get_value (reloc, link_info,
 215                                                    input_section))),
 216                  data + *dst_ptr);
 217       (*dst_ptr) += 1;
 218       (*src_ptr) += 1;
 219       break;
 220
 221     case R_IMM16:
 222       bfd_put_16 (in_abfd,
 223                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 224                   data + *dst_ptr);
 225       (*dst_ptr) += 2;
 226       (*src_ptr) += 2;
 227       break;
 228
 229     case R_JR:
 230       {
 231         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 232                                                   input_section);
 233         bfd_vma dot = (link_order->offset
 234                        + *dst_ptr
 235                        + input_section->output_section->vma);
 236         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 237                                      word and the pc's been incremented.  */
 238
 239         if (gap & 1)
 240           abort ();
 241         gap /= 2;
 242         if (gap > 128 || gap < -128)
 243           {
 244             if (! ((*link_info->callbacks->reloc_overflow)
 245                    (link_info, NULL,
 246                     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, NULL,
 275                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 276                     reloc->howto->name, reloc->addend, input_section->owner,
 277                     input_section, reloc->address)))
 278               abort ();
 279           }
 280         bfd_put_8 (in_abfd,
 281                    (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
 282                    data + *dst_ptr);
 283         (*dst_ptr)++;
 284         (*src_ptr)++;
 285         break;
 286       }
 287
 288     case R_CALLR:
 289       {
 290         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 291                                                   input_section);
 292         bfd_vma dot = (link_order->offset
 293                        + *dst_ptr
 294                        + input_section->output_section->vma);
 295         int gap = dst - dot - 2;
 296
 297         if (gap & 1)
 298           abort ();
 299         if (gap > 4096 || gap < -4095)
 300           {
 301             if (! ((*link_info->callbacks->reloc_overflow)
 302                    (link_info, NULL,
 303                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 304                     reloc->howto->name, reloc->addend, input_section->owner,
 305                     input_section, reloc->address)))
 306               abort ();
 307           }
 308         gap /= 2;
 309         bfd_put_16 (in_abfd,
 310                     (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
 311                     data + *dst_ptr);
 312         (*dst_ptr) += 2;
 313         (*src_ptr) += 2;
 314         break;
 315       }
 316
 317     case R_REL16:
 318       {
 319         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 320                                                   input_section);
 321         bfd_vma dot = (link_order->offset
 322                        + *dst_ptr
 323                        + input_section->output_section->vma);
 324         int gap = dst - dot - 2;
 325
 326         if (gap > 32767 || gap < -32768)
 327           {
 328             if (! ((*link_info->callbacks->reloc_overflow)
 329                    (link_info, NULL,
 330                     bfd_asymbol_name (*reloc->sym_ptr_ptr),
 331                     reloc->howto->name, reloc->addend, input_section->owner,
 332                     input_section, reloc->address)))
 333               abort ();
 334           }
 335         bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
 336         (*dst_ptr) += 2;
 337         (*src_ptr) += 2;
 338         break;
 339       }
 340
 341     default:
 342       abort ();
 343     }
 344 }
 345
 346 #define coff_reloc16_extra_cases    extra_case
 347 #define coff_bfd_reloc_type_lookup  coff_z8k_reloc_type_lookup
 348
 349 #include "coffcode.h"
 350
 351 #undef  coff_bfd_get_relocated_section_contents
 352 #define coff_bfd_get_relocated_section_contents \
 353   bfd_coff_reloc16_get_relocated_section_contents
 354
 355 #undef  coff_bfd_relax_section
 356 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 357
 358 CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)