bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright (C) 1992-2024 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.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, 4, 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, 1, 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, 2, 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, 1, 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, 2, 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, 1, 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, 1, 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, 2, 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       internal->howto = NULL;
  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 static reloc_howto_type *
 139 coff_z8k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
 140                             const char *r_name)
 141 {
 142   if (strcasecmp (r_imm8.name, r_name) == 0)
 143     return &r_imm8;
 144   if (strcasecmp (r_da.name, r_name) == 0)
 145     return &r_da;
 146   if (strcasecmp (r_imm32.name, r_name) == 0)
 147     return &r_imm32;
 148   if (strcasecmp (r_jr.name, r_name) == 0)
 149     return &r_jr;
 150   if (strcasecmp (r_rel16.name, r_name) == 0)
 151     return &r_rel16;
 152   if (strcasecmp (r_disp7.name, r_name) == 0)
 153     return &r_disp7;
 154   if (strcasecmp (r_callr.name, r_name) == 0)
 155     return &r_callr;
 156   if (strcasecmp (r_imm4l.name, r_name) == 0)
 157     return &r_imm4l;
 158
 159   return NULL;
 160 }
 161
 162 /* Perform any necessary magic to the addend in a reloc entry.  */
 163
 164 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 165  cache_ptr->addend =  ext_reloc.r_offset;
 166
 167 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 168  reloc_processing(relent, reloc, symbols, abfd, section)
 169
 170 static void
 171 reloc_processing (arelent *relent,
 172                   struct internal_reloc *reloc,
 173                   asymbol **symbols,
 174                   bfd *abfd,
 175                   asection *section)
 176 {
 177   relent->address = reloc->r_vaddr;
 178   rtype2howto (relent, reloc);
 179
 180   if (reloc->r_symndx == -1 || symbols == NULL)
 181     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 182   else if (reloc->r_symndx >= 0 && reloc->r_symndx < obj_conv_table_size (abfd))
 183     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 184   else
 185     {
 186       _bfd_error_handler
 187         /* xgettext:c-format */
 188         (_("%pB: warning: illegal symbol index %ld in relocs"),
 189          abfd, reloc->r_symndx);
 190       relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 191     }
 192   relent->addend = reloc->r_offset;
 193   relent->address -= section->vma;
 194 }
 195
 196 static bool
 197 extra_case (bfd *in_abfd,
 198             struct bfd_link_info *link_info,
 199             struct bfd_link_order *link_order,
 200             arelent *reloc,
 201             bfd_byte *data,
 202             size_t *src_ptr,
 203             size_t *dst_ptr)
 204 {
 205   asection * input_section = link_order->u.indirect.section;
 206   bfd_size_type end = bfd_get_section_limit_octets (in_abfd, input_section);
 207   bfd_size_type reloc_size = bfd_get_reloc_size (reloc->howto);
 208
 209   if (*src_ptr > end
 210       || reloc_size > end - *src_ptr)
 211     {
 212       link_info->callbacks->einfo
 213         /* xgettext:c-format */
 214         (_("%X%P: %pB(%pA): relocation \"%pR\" goes out of range\n"),
 215          in_abfd, input_section, reloc);
 216       return false;
 217     }
 218
 219   switch (reloc->howto->type)
 220     {
 221     case R_IMM8:
 222       bfd_put_8 (in_abfd,
 223                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 224                  data + *dst_ptr);
 225       *dst_ptr += 1;
 226       *src_ptr += 1;
 227       break;
 228
 229     case R_IMM32:
 230       /* If no flags are set, assume immediate value.  */
 231       if (! (*reloc->sym_ptr_ptr)->section->flags)
 232         {
 233           bfd_put_32 (in_abfd,
 234                       bfd_coff_reloc16_get_value (reloc, link_info,
 235                                                   input_section),
 236                       data + *dst_ptr);
 237         }
 238       else
 239         {
 240           bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 241                                                     input_section);
 242           /* Addresses are 23 bit, and the layout of those in a 32-bit
 243              value is as follows:
 244                1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
 245              (A - address bits,  x - ignore).  */
 246           dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
 247           bfd_put_32 (in_abfd, dst, data + *dst_ptr);
 248         }
 249       *dst_ptr += 4;
 250       *src_ptr += 4;
 251       break;
 252
 253     case R_IMM4L:
 254       bfd_put_8 (in_abfd,
 255                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 256                   | (0x0f & bfd_coff_reloc16_get_value (reloc, link_info,
 257                                                         input_section))),
 258                  data + *dst_ptr);
 259       *dst_ptr += 1;
 260       *src_ptr += 1;
 261       break;
 262
 263     case R_IMM16:
 264       bfd_put_16 (in_abfd,
 265                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 266                   data + *dst_ptr);
 267       *dst_ptr += 2;
 268       *src_ptr += 2;
 269       break;
 270
 271     case R_JR:
 272       {
 273         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 274                                                   input_section);
 275         bfd_vma dot = (*dst_ptr
 276                        + input_section->output_offset
 277                        + input_section->output_section->vma);
 278         /* -1, since we're in the odd byte of the word and the pc has
 279            been incremented.  */
 280         bfd_signed_vma gap = dst - dot - 1;
 281
 282         if ((gap & 1) != 0 || gap > 254 || gap < -256)
 283           {
 284             link_info->callbacks->reloc_overflow
 285               (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 286                reloc->howto->name, reloc->addend, input_section->owner,
 287                input_section, reloc->address);
 288             return false;
 289           }
 290
 291         bfd_put_8 (in_abfd, gap / 2, data + *dst_ptr);
 292         *dst_ptr += 1;
 293         *src_ptr += 1;
 294         break;
 295       }
 296
 297     case R_DISP7:
 298       {
 299         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 300                                                   input_section);
 301         bfd_vma dot = (*dst_ptr
 302                        + input_section->output_offset
 303                        + input_section->output_section->vma);
 304         bfd_signed_vma gap = dst - dot - 1;
 305
 306         if ((gap & 1) != 0 || gap > 0 || gap < -254)
 307           {
 308             link_info->callbacks->reloc_overflow
 309               (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 310                reloc->howto->name, reloc->addend, input_section->owner,
 311                input_section, reloc->address);
 312             return false;
 313           }
 314
 315         bfd_put_8 (in_abfd,
 316                    ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0x80)
 317                     + (-gap / 2 & 0x7f)),
 318                    data + *dst_ptr);
 319         *dst_ptr += 1;
 320         *src_ptr += 1;
 321         break;
 322       }
 323
 324     case R_CALLR:
 325       {
 326         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 327                                                   input_section);
 328         bfd_vma dot = (*dst_ptr
 329                        + input_section->output_offset
 330                        + input_section->output_section->vma);
 331         bfd_signed_vma gap = dst - dot - 2;
 332
 333         if ((gap & 1) != 0 || gap > 4096 || gap < -4095)
 334           {
 335             link_info->callbacks->reloc_overflow
 336               (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 337                reloc->howto->name, reloc->addend, input_section->owner,
 338                input_section, reloc->address);
 339             return false;
 340           }
 341
 342         bfd_put_16 (in_abfd,
 343                     ((bfd_get_16 (in_abfd, data + *dst_ptr) & 0xf000)
 344                      | (-gap / 2 & 0x0fff)),
 345                     data + *dst_ptr);
 346         *dst_ptr += 2;
 347         *src_ptr += 2;
 348         break;
 349       }
 350
 351     case R_REL16:
 352       {
 353         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 354                                                   input_section);
 355         bfd_vma dot = (*dst_ptr
 356                        + input_section->output_offset
 357                        + input_section->output_section->vma);
 358         bfd_signed_vma gap = dst - dot - 2;
 359
 360         if (gap > 32767 || gap < -32768)
 361           {
 362             link_info->callbacks->reloc_overflow
 363               (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 364                reloc->howto->name, reloc->addend, input_section->owner,
 365                input_section, reloc->address);
 366             return false;
 367           }
 368
 369         bfd_put_16 (in_abfd, gap, data + *dst_ptr);
 370         *dst_ptr += 2;
 371         *src_ptr += 2;
 372         break;
 373       }
 374
 375     default:
 376       link_info->callbacks->einfo
 377         /* xgettext:c-format */
 378         (_("%X%P: %pB(%pA): relocation \"%pR\" is not supported\n"),
 379          in_abfd, input_section, reloc);
 380       return false;
 381     }
 382   return true;
 383 }
 384
 385 #define coff_reloc16_extra_cases    extra_case
 386 #define coff_bfd_reloc_type_lookup  coff_z8k_reloc_type_lookup
 387 #define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup
 388
 389 #ifndef bfd_pe_print_pdata
 390 #define bfd_pe_print_pdata      NULL
 391 #endif
 392
 393 #include "coffcode.h"
 394
 395 #undef  coff_bfd_get_relocated_section_contents
 396 #define coff_bfd_get_relocated_section_contents \
 397   bfd_coff_reloc16_get_relocated_section_contents
 398
 399 #undef  coff_bfd_relax_section
 400 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 401
 402 CREATE_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)