bfd/i386lynx.c

   1 /* BFD back-end for i386 a.out binaries under LynxOS.
   2    Copyright (C) 1990, 1991, 1992 Free Software Foundation, Inc.
   3
   4 This file is part of BFD, the Binary File Descriptor library.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #define BYTES_IN_WORD 4
  21 #define ARCH 32
  22 #define N_SHARED_LIB(x) 0
  23
  24 #define TEXT_START_ADDR 0
  25 #define PAGE_SIZE 4096
  26 #define SEGMENT_SIZE PAGE_SIZE
  27 #define DEFAULT_ARCH bfd_arch_i386
  28
  29 #define MY(OP) CAT(i386lynx_aout_,OP)
  30 #define TARGETNAME "a.out-i386-lynx"
  31
  32 #include "bfd.h"
  33 #include "sysdep.h"
  34 #include "libbfd.h"
  35
  36 #ifndef WRITE_HEADERS
  37 #define WRITE_HEADERS(abfd, execp)                                            \
  38       {                                                                       \
  39         bfd_size_type text_size; /* dummy vars */                             \
  40         file_ptr text_end;                                                    \
  41         if (adata(abfd).magic == undecided_magic)                             \
  42           NAME(aout,adjust_sizes_and_vmas) (abfd, &text_size, &text_end);     \
  43                                                                               \
  44         execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE;        \
  45         execp->a_entry = bfd_get_start_address (abfd);                        \
  46                                                                               \
  47         execp->a_trsize = ((obj_textsec (abfd)->reloc_count) *                \
  48                            obj_reloc_entry_size (abfd));                      \
  49         execp->a_drsize = ((obj_datasec (abfd)->reloc_count) *                \
  50                            obj_reloc_entry_size (abfd));                      \
  51         NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes);           \
  52                                                                               \
  53         if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0) return false;       \
  54         if (bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)           \
  55             != EXEC_BYTES_SIZE)                                               \
  56           return false;                                                       \
  57         /* Now write out reloc info, followed by syms and strings */          \
  58                                                                               \
  59         if (bfd_get_symcount (abfd) != 0)                                     \
  60             {                                                                 \
  61               if (bfd_seek (abfd, (file_ptr)(N_SYMOFF(*execp)), SEEK_SET)     \
  62                   != 0)                                                       \
  63                 return false;                                                 \
  64                                                                               \
  65               if (! NAME(aout,write_syms)(abfd)) return false;                \
  66                                                                               \
  67               if (bfd_seek (abfd, (file_ptr)(N_TRELOFF(*execp)), SEEK_SET)    \
  68                   != 0)                                                       \
  69                 return false;                                                 \
  70                                                                               \
  71               if (!NAME(lynx,squirt_out_relocs) (abfd, obj_textsec (abfd)))   \
  72                 return false;                                                 \
  73               if (bfd_seek (abfd, (file_ptr)(N_DRELOFF(*execp)), SEEK_SET)    \
  74                   != 0)                                                       \
  75                 return 0;                                                     \
  76                                                                               \
  77               if (!NAME(lynx,squirt_out_relocs)(abfd, obj_datasec (abfd)))    \
  78                 return false;                                                 \
  79             }                                                                 \
  80       }
  81 #endif
  82
  83 #include "libaout.h"
  84 #include "aout/aout64.h"
  85
  86 #ifdef HOST_LYNX
  87
  88 char *lynx_core_file_failing_command ();
  89 int lynx_core_file_failing_signal ();
  90 boolean lynx_core_file_matches_executable_p ();
  91 bfd_target *lynx_core_file_p ();
  92
  93 #define MY_core_file_failing_command lynx_core_file_failing_command
  94 #define MY_core_file_failing_signal lynx_core_file_failing_signal
  95 #define MY_core_file_matches_executable_p lynx_core_file_matches_executable_p
  96 #define MY_core_file_p lynx_core_file_p
  97
  98 #endif /* HOST_LYNX */
  99 \f
 100
 101 #define KEEPIT flags
 102
 103 extern reloc_howto_type aout_32_ext_howto_table[];
 104 extern reloc_howto_type aout_32_std_howto_table[];
 105
 106 /* Standard reloc stuff */
 107 /* Output standard relocation information to a file in target byte order. */
 108
 109 void
 110 NAME (lynx, swap_std_reloc_out) (abfd, g, natptr)
 111      bfd *abfd;
 112      arelent *g;
 113      struct reloc_std_external *natptr;
 114 {
 115   int r_index;
 116   asymbol *sym = *(g->sym_ptr_ptr);
 117   int r_extern;
 118   unsigned int r_length;
 119   int r_pcrel;
 120   int r_baserel, r_jmptable, r_relative;
 121   unsigned int r_addend;
 122   asection *output_section = sym->section->output_section;
 123
 124   PUT_WORD (abfd, g->address, natptr->r_address);
 125
 126   r_length = g->howto->size;    /* Size as a power of two */
 127   r_pcrel = (int) g->howto->pc_relative;        /* Relative to PC? */
 128   /* r_baserel, r_jmptable, r_relative???  FIXME-soon */
 129   r_baserel = 0;
 130   r_jmptable = 0;
 131   r_relative = 0;
 132
 133   r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
 134
 135   /* name was clobbered by aout_write_syms to be symbol index */
 136
 137   /* If this relocation is relative to a symbol then set the
 138      r_index to the symbols index, and the r_extern bit.
 139
 140      Absolute symbols can come in in two ways, either as an offset
 141      from the abs section, or as a symbol which has an abs value.
 142      check for that here
 143      */
 144
 145
 146   if (bfd_is_com_section (output_section)
 147       || output_section == &bfd_abs_section
 148       || output_section == &bfd_und_section)
 149     {
 150       if (bfd_abs_section.symbol == sym)
 151         {
 152           /* Whoops, looked like an abs symbol, but is really an offset
 153            from the abs section */
 154           r_index = 0;
 155           r_extern = 0;
 156         }
 157       else
 158         {
 159           /* Fill in symbol */
 160           r_extern = 1;
 161           r_index = stoi ((*(g->sym_ptr_ptr))->KEEPIT);
 162
 163         }
 164     }
 165   else
 166     {
 167       /* Just an ordinary section */
 168       r_extern = 0;
 169       r_index = output_section->target_index;
 170     }
 171
 172   /* now the fun stuff */
 173   if (abfd->xvec->header_byteorder_big_p != false)
 174     {
 175       natptr->r_index[0] = r_index >> 16;
 176       natptr->r_index[1] = r_index >> 8;
 177       natptr->r_index[2] = r_index;
 178       natptr->r_type[0] =
 179         (r_extern ? RELOC_STD_BITS_EXTERN_BIG : 0)
 180         | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG : 0)
 181         | (r_baserel ? RELOC_STD_BITS_BASEREL_BIG : 0)
 182         | (r_jmptable ? RELOC_STD_BITS_JMPTABLE_BIG : 0)
 183         | (r_relative ? RELOC_STD_BITS_RELATIVE_BIG : 0)
 184         | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG);
 185     }
 186   else
 187     {
 188       natptr->r_index[2] = r_index >> 16;
 189       natptr->r_index[1] = r_index >> 8;
 190       natptr->r_index[0] = r_index;
 191       natptr->r_type[0] =
 192         (r_extern ? RELOC_STD_BITS_EXTERN_LITTLE : 0)
 193         | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE : 0)
 194         | (r_baserel ? RELOC_STD_BITS_BASEREL_LITTLE : 0)
 195         | (r_jmptable ? RELOC_STD_BITS_JMPTABLE_LITTLE : 0)
 196         | (r_relative ? RELOC_STD_BITS_RELATIVE_LITTLE : 0)
 197         | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE);
 198     }
 199 }
 200
 201
 202 /* Extended stuff */
 203 /* Output extended relocation information to a file in target byte order. */
 204
 205 void
 206 NAME (lynx, swap_ext_reloc_out) (abfd, g, natptr)
 207      bfd *abfd;
 208      arelent *g;
 209      register struct reloc_ext_external *natptr;
 210 {
 211   int r_index;
 212   int r_extern;
 213   unsigned int r_type;
 214   unsigned int r_addend;
 215   asymbol *sym = *(g->sym_ptr_ptr);
 216   asection *output_section = sym->section->output_section;
 217
 218   PUT_WORD (abfd, g->address, natptr->r_address);
 219
 220   r_type = (unsigned int) g->howto->type;
 221
 222   r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
 223
 224
 225   /* If this relocation is relative to a symbol then set the
 226      r_index to the symbols index, and the r_extern bit.
 227
 228      Absolute symbols can come in in two ways, either as an offset
 229      from the abs section, or as a symbol which has an abs value.
 230      check for that here
 231      */
 232
 233   if (bfd_is_com_section (output_section)
 234       || output_section == &bfd_abs_section
 235       || output_section == &bfd_und_section)
 236     {
 237       if (bfd_abs_section.symbol == sym)
 238         {
 239           /* Whoops, looked like an abs symbol, but is really an offset
 240          from the abs section */
 241           r_index = 0;
 242           r_extern = 0;
 243         }
 244       else
 245         {
 246           r_extern = 1;
 247           r_index = stoi ((*(g->sym_ptr_ptr))->KEEPIT);
 248         }
 249     }
 250   else
 251     {
 252       /* Just an ordinary section */
 253       r_extern = 0;
 254       r_index = output_section->target_index;
 255     }
 256
 257
 258   /* now the fun stuff */
 259   if (abfd->xvec->header_byteorder_big_p != false)
 260     {
 261       natptr->r_index[0] = r_index >> 16;
 262       natptr->r_index[1] = r_index >> 8;
 263       natptr->r_index[2] = r_index;
 264       natptr->r_type[0] =
 265         (r_extern ? RELOC_EXT_BITS_EXTERN_BIG : 0)
 266         | (r_type << RELOC_EXT_BITS_TYPE_SH_BIG);
 267     }
 268   else
 269     {
 270       natptr->r_index[2] = r_index >> 16;
 271       natptr->r_index[1] = r_index >> 8;
 272       natptr->r_index[0] = r_index;
 273       natptr->r_type[0] =
 274         (r_extern ? RELOC_EXT_BITS_EXTERN_LITTLE : 0)
 275         | (r_type << RELOC_EXT_BITS_TYPE_SH_LITTLE);
 276     }
 277
 278   PUT_WORD (abfd, r_addend, natptr->r_addend);
 279 }
 280
 281 /* BFD deals internally with all things based from the section they're
 282    in. so, something in 10 bytes into a text section  with a base of
 283    50 would have a symbol (.text+10) and know .text vma was 50.
 284
 285    Aout keeps all it's symbols based from zero, so the symbol would
 286    contain 60. This macro subs the base of each section from the value
 287    to give the true offset from the section */
 288
 289
 290 #define MOVE_ADDRESS(ad)                                                \
 291   if (r_extern) {                                                       \
 292    /* undefined symbol */                                               \
 293      cache_ptr->sym_ptr_ptr = symbols + r_index;                        \
 294      cache_ptr->addend = ad;                                            \
 295      } else {                                                           \
 296     /* defined, section relative. replace symbol with pointer to        \
 297        symbol which points to section  */                               \
 298     switch (r_index) {                                                  \
 299     case N_TEXT:                                                        \
 300     case N_TEXT | N_EXT:                                                \
 301       cache_ptr->sym_ptr_ptr  = obj_textsec(abfd)->symbol_ptr_ptr;      \
 302       cache_ptr->addend = ad  - su->textsec->vma;                       \
 303       break;                                                            \
 304     case N_DATA:                                                        \
 305     case N_DATA | N_EXT:                                                \
 306       cache_ptr->sym_ptr_ptr  = obj_datasec(abfd)->symbol_ptr_ptr;      \
 307       cache_ptr->addend = ad - su->datasec->vma;                        \
 308       break;                                                            \
 309     case N_BSS:                                                         \
 310     case N_BSS | N_EXT:                                                 \
 311       cache_ptr->sym_ptr_ptr  = obj_bsssec(abfd)->symbol_ptr_ptr;       \
 312       cache_ptr->addend = ad - su->bsssec->vma;                         \
 313       break;                                                            \
 314     default:                                                            \
 315     case N_ABS:                                                         \
 316     case N_ABS | N_EXT:                                                 \
 317      cache_ptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;   \
 318       cache_ptr->addend = ad;                                           \
 319       break;                                                            \
 320     }                                                                   \
 321   }                                                                     \
 322
 323 void
 324 NAME (lynx, swap_ext_reloc_in) (abfd, bytes, cache_ptr, symbols)
 325      bfd *abfd;
 326      struct reloc_ext_external *bytes;
 327      arelent *cache_ptr;
 328      asymbol **symbols;
 329 {
 330   int r_index;
 331   int r_extern;
 332   unsigned int r_type;
 333   struct aoutdata *su = &(abfd->tdata.aout_data->a);
 334
 335   cache_ptr->address = (GET_SWORD (abfd, bytes->r_address));
 336
 337   r_index = bytes->r_index[1];
 338   r_extern = (0 != (bytes->r_index[0] & RELOC_EXT_BITS_EXTERN_BIG));
 339   r_type = (bytes->r_index[0] & RELOC_EXT_BITS_TYPE_BIG)
 340     >> RELOC_EXT_BITS_TYPE_SH_BIG;
 341
 342   cache_ptr->howto = aout_32_ext_howto_table + r_type;
 343   MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend));
 344 }
 345
 346 void
 347 NAME (lynx, swap_std_reloc_in) (abfd, bytes, cache_ptr, symbols)
 348      bfd *abfd;
 349      struct reloc_std_external *bytes;
 350      arelent *cache_ptr;
 351      asymbol **symbols;
 352 {
 353   int r_index;
 354   int r_extern;
 355   unsigned int r_length;
 356   int r_pcrel;
 357   int r_baserel, r_jmptable, r_relative;
 358   struct aoutdata *su = &(abfd->tdata.aout_data->a);
 359
 360   cache_ptr->address = bfd_h_get_32 (abfd, bytes->r_address);
 361
 362   r_index = bytes->r_index[1];
 363   r_extern = (0 != (bytes->r_index[0] & RELOC_STD_BITS_EXTERN_BIG));
 364   r_pcrel = (0 != (bytes->r_index[0] & RELOC_STD_BITS_PCREL_BIG));
 365   r_baserel = (0 != (bytes->r_index[0] & RELOC_STD_BITS_BASEREL_BIG));
 366   r_jmptable = (0 != (bytes->r_index[0] & RELOC_STD_BITS_JMPTABLE_BIG));
 367   r_relative = (0 != (bytes->r_index[0] & RELOC_STD_BITS_RELATIVE_BIG));
 368   r_length = (bytes->r_index[0] & RELOC_STD_BITS_LENGTH_BIG)
 369     >> RELOC_STD_BITS_LENGTH_SH_BIG;
 370
 371   cache_ptr->howto = aout_32_std_howto_table + r_length + 4 * r_pcrel;
 372   /* FIXME-soon:  Roll baserel, jmptable, relative bits into howto setting */
 373
 374   MOVE_ADDRESS (0);
 375 }
 376
 377 /* Reloc hackery */
 378
 379 boolean
 380 NAME(lynx,slurp_reloc_table) (abfd, asect, symbols)
 381      bfd *abfd;
 382      sec_ptr asect;
 383      asymbol **symbols;
 384 {
 385   unsigned int count;
 386   bfd_size_type reloc_size;
 387   PTR relocs;
 388   arelent *reloc_cache;
 389   size_t each_size;
 390
 391   if (asect->relocation)
 392     return true;
 393
 394   if (asect->flags & SEC_CONSTRUCTOR)
 395     return true;
 396
 397   if (asect == obj_datasec (abfd))
 398     {
 399       reloc_size = exec_hdr (abfd)->a_drsize;
 400       goto doit;
 401     }
 402
 403   if (asect == obj_textsec (abfd))
 404     {
 405       reloc_size = exec_hdr (abfd)->a_trsize;
 406       goto doit;
 407     }
 408
 409   bfd_set_error (bfd_error_invalid_operation);
 410   return false;
 411
 412 doit:
 413   if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
 414     return false;
 415   each_size = obj_reloc_entry_size (abfd);
 416
 417   count = reloc_size / each_size;
 418
 419
 420   reloc_cache = (arelent *) malloc (count * sizeof (arelent));
 421   if (!reloc_cache && count != 0)
 422     {
 423     nomem:
 424       bfd_set_error (bfd_error_no_memory);
 425       return false;
 426     }
 427   memset (reloc_cache, 0, count * sizeof (arelent));
 428
 429   relocs = (PTR) bfd_alloc (abfd, reloc_size);
 430   if (!relocs)
 431     {
 432       free (reloc_cache);
 433       goto nomem;
 434     }
 435
 436   if (bfd_read (relocs, 1, reloc_size, abfd) != reloc_size)
 437     {
 438       bfd_release (abfd, relocs);
 439       free (reloc_cache);
 440       return false;
 441     }
 442
 443   if (each_size == RELOC_EXT_SIZE)
 444     {
 445       register struct reloc_ext_external *rptr = (struct reloc_ext_external *) relocs;
 446       unsigned int counter = 0;
 447       arelent *cache_ptr = reloc_cache;
 448
 449       for (; counter < count; counter++, rptr++, cache_ptr++)
 450         {
 451           NAME (lynx, swap_ext_reloc_in) (abfd, rptr, cache_ptr, symbols);
 452         }
 453     }
 454   else
 455     {
 456       register struct reloc_std_external *rptr = (struct reloc_std_external *) relocs;
 457       unsigned int counter = 0;
 458       arelent *cache_ptr = reloc_cache;
 459
 460       for (; counter < count; counter++, rptr++, cache_ptr++)
 461         {
 462           NAME (lynx, swap_std_reloc_in) (abfd, rptr, cache_ptr, symbols);
 463         }
 464
 465     }
 466
 467   bfd_release (abfd, relocs);
 468   asect->relocation = reloc_cache;
 469   asect->reloc_count = count;
 470   return true;
 471 }
 472
 473
 474
 475 /* Write out a relocation section into an object file.  */
 476
 477 boolean
 478 NAME (lynx, squirt_out_relocs) (abfd, section)
 479      bfd *abfd;
 480      asection *section;
 481 {
 482   arelent **generic;
 483   unsigned char *native, *natptr;
 484   size_t each_size;
 485
 486   unsigned int count = section->reloc_count;
 487   size_t natsize;
 488
 489   if (count == 0)
 490     return true;
 491
 492   each_size = obj_reloc_entry_size (abfd);
 493   natsize = each_size * count;
 494   native = (unsigned char *) bfd_zalloc (abfd, natsize);
 495   if (!native)
 496     {
 497       bfd_set_error (bfd_error_no_memory);
 498       return false;
 499     }
 500
 501   generic = section->orelocation;
 502
 503   if (each_size == RELOC_EXT_SIZE)
 504     {
 505       for (natptr = native;
 506            count != 0;
 507            --count, natptr += each_size, ++generic)
 508         NAME (lynx, swap_ext_reloc_out) (abfd, *generic, (struct reloc_ext_external *) natptr);
 509     }
 510   else
 511     {
 512       for (natptr = native;
 513            count != 0;
 514            --count, natptr += each_size, ++generic)
 515         NAME (lynx, swap_std_reloc_out) (abfd, *generic, (struct reloc_std_external *) natptr);
 516     }
 517
 518   if (bfd_write ((PTR) native, 1, natsize, abfd) != natsize)
 519     {
 520       bfd_release (abfd, native);
 521       return false;
 522     }
 523   bfd_release (abfd, native);
 524
 525   return true;
 526 }
 527
 528 /* This is stupid.  This function should be a boolean predicate */
 529 long
 530 NAME(lynx,canonicalize_reloc) (abfd, section, relptr, symbols)
 531      bfd *abfd;
 532      sec_ptr section;
 533      arelent **relptr;
 534      asymbol **symbols;
 535 {
 536   arelent *tblptr = section->relocation;
 537   unsigned int count;
 538
 539   if (!(tblptr || NAME (lynx, slurp_reloc_table) (abfd, section, symbols)))
 540     return -1;
 541
 542   if (section->flags & SEC_CONSTRUCTOR)
 543     {
 544       arelent_chain *chain = section->constructor_chain;
 545       for (count = 0; count < section->reloc_count; count++)
 546         {
 547           *relptr++ = &chain->relent;
 548           chain = chain->next;
 549         }
 550     }
 551   else
 552     {
 553       tblptr = section->relocation;
 554       if (!tblptr)
 555         return -1;
 556
 557       for (count = 0; count++ < section->reloc_count;)
 558         {
 559           *relptr++ = tblptr++;
 560         }
 561     }
 562   *relptr = 0;
 563
 564   return section->reloc_count;
 565 }
 566
 567 #define MY_canonicalize_reloc NAME(lynx,canonicalize_reloc)
 568
 569 #include "aout-target.h"