bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright (C) 1992-2023 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 void
 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             unsigned int *src_ptr,
 203             unsigned int *dst_ptr)
 204 {
 205   asection * input_section = link_order->u.indirect.section;
 206
 207   switch (reloc->howto->type)
 208     {
 209     case R_IMM8:
 210       bfd_put_8 (in_abfd,
 211                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 212                  data + *dst_ptr);
 213       (*dst_ptr) += 1;
 214       (*src_ptr) += 1;
 215       break;
 216
 217     case R_IMM32:
 218       /* If no flags are set, assume immediate value.  */
 219       if (! (*reloc->sym_ptr_ptr)->section->flags)
 220         {
 221           bfd_put_32 (in_abfd,
 222                       bfd_coff_reloc16_get_value (reloc, link_info,
 223                                                   input_section),
 224                       data + *dst_ptr);
 225         }
 226       else
 227         {
 228           bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 229                                                     input_section);
 230           /* Addresses are 23 bit, and the layout of those in a 32-bit
 231              value is as follows:
 232                1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
 233              (A - address bits,  x - ignore).  */
 234           dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
 235           bfd_put_32 (in_abfd, dst, data + *dst_ptr);
 236         }
 237       (*dst_ptr) += 4;
 238       (*src_ptr) += 4;
 239       break;
 240
 241     case R_IMM4L:
 242       bfd_put_8 (in_abfd,
 243                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 244                   | (0x0f
 245                      & bfd_coff_reloc16_get_value (reloc, link_info,
 246                                                    input_section))),
 247                  data + *dst_ptr);
 248       (*dst_ptr) += 1;
 249       (*src_ptr) += 1;
 250       break;
 251
 252     case R_IMM16:
 253       bfd_put_16 (in_abfd,
 254                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 255                   data + *dst_ptr);
 256       (*dst_ptr) += 2;
 257       (*src_ptr) += 2;
 258       break;
 259
 260     case R_JR:
 261       {
 262         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 263                                                   input_section);
 264         bfd_vma dot = (*dst_ptr
 265                        + input_section->output_offset
 266                        + input_section->output_section->vma);
 267         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 268                                      word and the pc's been incremented.  */
 269
 270         if (gap & 1)
 271           abort ();
 272         gap /= 2;
 273         if (gap > 127 || gap < -128)
 274           (*link_info->callbacks->reloc_overflow)
 275             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 276              reloc->howto->name, reloc->addend, input_section->owner,
 277              input_section, reloc->address);
 278
 279         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 280         (*dst_ptr)++;
 281         (*src_ptr)++;
 282         break;
 283       }
 284
 285     case R_DISP7:
 286       {
 287         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 288                                                   input_section);
 289         bfd_vma dot = (*dst_ptr
 290                        + input_section->output_offset
 291                        + input_section->output_section->vma);
 292         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 293                                      word and the pc's been incremented.  */
 294
 295         if (gap & 1)
 296           abort ();
 297         gap /= 2;
 298
 299         if (gap > 0 || gap < -127)
 300           (*link_info->callbacks->reloc_overflow)
 301             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 302              reloc->howto->name, reloc->addend, input_section->owner,
 303              input_section, reloc->address);
 304
 305         bfd_put_8 (in_abfd,
 306                    (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
 307                    data + *dst_ptr);
 308         (*dst_ptr)++;
 309         (*src_ptr)++;
 310         break;
 311       }
 312
 313     case R_CALLR:
 314       {
 315         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 316                                                   input_section);
 317         bfd_vma dot = (*dst_ptr
 318                        + input_section->output_offset
 319                        + input_section->output_section->vma);
 320         int gap = dst - dot - 2;
 321
 322         if (gap & 1)
 323           abort ();
 324         if (gap > 4096 || gap < -4095)
 325           (*link_info->callbacks->reloc_overflow)
 326             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 327              reloc->howto->name, reloc->addend, input_section->owner,
 328              input_section, reloc->address);
 329
 330         gap /= 2;
 331         bfd_put_16 (in_abfd,
 332                     (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
 333                     data + *dst_ptr);
 334         (*dst_ptr) += 2;
 335         (*src_ptr) += 2;
 336         break;
 337       }
 338
 339     case R_REL16:
 340       {
 341         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 342                                                   input_section);
 343         bfd_vma dot = (*dst_ptr
 344                        + input_section->output_offset
 345                        + input_section->output_section->vma);
 346         int gap = dst - dot - 2;
 347
 348         if (gap > 32767 || gap < -32768)
 349           (*link_info->callbacks->reloc_overflow)
 350             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 351              reloc->howto->name, reloc->addend, input_section->owner,
 352              input_section, reloc->address);
 353
 354         bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
 355         (*dst_ptr) += 2;
 356         (*src_ptr) += 2;
 357         break;
 358       }
 359
 360     default:
 361       abort ();
 362     }
 363 }
 364
 365 #define coff_reloc16_extra_cases    extra_case
 366 #define coff_bfd_reloc_type_lookup  coff_z8k_reloc_type_lookup
 367 #define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup
 368
 369 #ifndef bfd_pe_print_pdata
 370 #define bfd_pe_print_pdata      NULL
 371 #endif
 372
 373 #include "coffcode.h"
 374
 375 #undef  coff_bfd_get_relocated_section_contents
 376 #define coff_bfd_get_relocated_section_contents \
 377   bfd_coff_reloc16_get_relocated_section_contents
 378
 379 #undef  coff_bfd_relax_section
 380 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 381
 382 CREATE_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)