bfd/coff-z8k.c

   1 /* BFD back-end for Zilog Z800n COFF binaries.
   2    Copyright (C) 1992-2020 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, 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       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 > 0)
 181     relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
 182   else
 183     relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
 184
 185   relent->addend = reloc->r_offset;
 186   relent->address -= section->vma;
 187 }
 188
 189 static void
 190 extra_case (bfd *in_abfd,
 191             struct bfd_link_info *link_info,
 192             struct bfd_link_order *link_order,
 193             arelent *reloc,
 194             bfd_byte *data,
 195             unsigned int *src_ptr,
 196             unsigned int *dst_ptr)
 197 {
 198   asection * input_section = link_order->u.indirect.section;
 199
 200   switch (reloc->howto->type)
 201     {
 202     case R_IMM8:
 203       bfd_put_8 (in_abfd,
 204                  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 205                  data + *dst_ptr);
 206       (*dst_ptr) += 1;
 207       (*src_ptr) += 1;
 208       break;
 209
 210     case R_IMM32:
 211       /* If no flags are set, assume immediate value.  */
 212       if (! (*reloc->sym_ptr_ptr)->section->flags)
 213         {
 214           bfd_put_32 (in_abfd,
 215                       bfd_coff_reloc16_get_value (reloc, link_info,
 216                                                   input_section),
 217                       data + *dst_ptr);
 218         }
 219       else
 220         {
 221           bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 222                                                     input_section);
 223           /* Addresses are 23 bit, and the layout of those in a 32-bit
 224              value is as follows:
 225                1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
 226              (A - address bits,  x - ignore).  */
 227           dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
 228           bfd_put_32 (in_abfd, dst, data + *dst_ptr);
 229         }
 230       (*dst_ptr) += 4;
 231       (*src_ptr) += 4;
 232       break;
 233
 234     case R_IMM4L:
 235       bfd_put_8 (in_abfd,
 236                  ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
 237                   | (0x0f
 238                      & bfd_coff_reloc16_get_value (reloc, link_info,
 239                                                    input_section))),
 240                  data + *dst_ptr);
 241       (*dst_ptr) += 1;
 242       (*src_ptr) += 1;
 243       break;
 244
 245     case R_IMM16:
 246       bfd_put_16 (in_abfd,
 247                   bfd_coff_reloc16_get_value (reloc, link_info, input_section),
 248                   data + *dst_ptr);
 249       (*dst_ptr) += 2;
 250       (*src_ptr) += 2;
 251       break;
 252
 253     case R_JR:
 254       {
 255         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 256                                                   input_section);
 257         bfd_vma dot = (*dst_ptr
 258                        + input_section->output_offset
 259                        + input_section->output_section->vma);
 260         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 261                                      word and the pc's been incremented.  */
 262
 263         if (gap & 1)
 264           abort ();
 265         gap /= 2;
 266         if (gap > 127 || gap < -128)
 267           (*link_info->callbacks->reloc_overflow)
 268             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 269              reloc->howto->name, reloc->addend, input_section->owner,
 270              input_section, reloc->address);
 271
 272         bfd_put_8 (in_abfd, gap, data + *dst_ptr);
 273         (*dst_ptr)++;
 274         (*src_ptr)++;
 275         break;
 276       }
 277
 278     case R_DISP7:
 279       {
 280         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 281                                                   input_section);
 282         bfd_vma dot = (*dst_ptr
 283                        + input_section->output_offset
 284                        + input_section->output_section->vma);
 285         int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
 286                                      word and the pc's been incremented.  */
 287
 288         if (gap & 1)
 289           abort ();
 290         gap /= 2;
 291
 292         if (gap > 0 || gap < -127)
 293           (*link_info->callbacks->reloc_overflow)
 294             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 295              reloc->howto->name, reloc->addend, input_section->owner,
 296              input_section, reloc->address);
 297
 298         bfd_put_8 (in_abfd,
 299                    (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
 300                    data + *dst_ptr);
 301         (*dst_ptr)++;
 302         (*src_ptr)++;
 303         break;
 304       }
 305
 306     case R_CALLR:
 307       {
 308         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 309                                                   input_section);
 310         bfd_vma dot = (*dst_ptr
 311                        + input_section->output_offset
 312                        + input_section->output_section->vma);
 313         int gap = dst - dot - 2;
 314
 315         if (gap & 1)
 316           abort ();
 317         if (gap > 4096 || gap < -4095)
 318           (*link_info->callbacks->reloc_overflow)
 319             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 320              reloc->howto->name, reloc->addend, input_section->owner,
 321              input_section, reloc->address);
 322
 323         gap /= 2;
 324         bfd_put_16 (in_abfd,
 325                     (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
 326                     data + *dst_ptr);
 327         (*dst_ptr) += 2;
 328         (*src_ptr) += 2;
 329         break;
 330       }
 331
 332     case R_REL16:
 333       {
 334         bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
 335                                                   input_section);
 336         bfd_vma dot = (*dst_ptr
 337                        + input_section->output_offset
 338                        + input_section->output_section->vma);
 339         int gap = dst - dot - 2;
 340
 341         if (gap > 32767 || gap < -32768)
 342           (*link_info->callbacks->reloc_overflow)
 343             (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
 344              reloc->howto->name, reloc->addend, input_section->owner,
 345              input_section, reloc->address);
 346
 347         bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
 348         (*dst_ptr) += 2;
 349         (*src_ptr) += 2;
 350         break;
 351       }
 352
 353     default:
 354       abort ();
 355     }
 356 }
 357
 358 #define coff_reloc16_extra_cases    extra_case
 359 #define coff_bfd_reloc_type_lookup  coff_z8k_reloc_type_lookup
 360 #define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup
 361
 362 #ifndef bfd_pe_print_pdata
 363 #define bfd_pe_print_pdata      NULL
 364 #endif
 365
 366 #include "coffcode.h"
 367
 368 #undef  coff_bfd_get_relocated_section_contents
 369 #define coff_bfd_get_relocated_section_contents \
 370   bfd_coff_reloc16_get_relocated_section_contents
 371
 372 #undef  coff_bfd_relax_section
 373 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
 374
 375 CREATE_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)