gas/config/obj-ieee.c

   1 /* obj-format for ieee-695 records.
   2    Copyright 1991, 1992, 1993, 1994, 1997, 2000, 2001, 2002, 2003, 2005
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   7    GAS is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    GAS is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GAS; see the file COPYING.  If not, write to the Free
  19    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 /* Created by Steve Chamberlain <steve@cygnus.com>.  */
  23
  24 /* This will hopefully become the port through which bfd and gas talk,
  25    for the moment, only ieee is known to work well.  */
  26
  27 #include "bfd.h"
  28 #include "as.h"
  29 #include "subsegs.h"
  30 #include "output-file.h"
  31 #include "frags.h"
  32
  33 bfd *abfd;
  34
  35 /* How many addresses does the .align take?  */
  36
  37 static relax_addressT
  38 relax_align (address, alignment)
  39      /* Address now.  */
  40      register relax_addressT address;
  41
  42      /* Alignment (binary).  */
  43      register long alignment;
  44 {
  45   relax_addressT mask;
  46   relax_addressT new_address;
  47
  48   mask = ~((~0) << alignment);
  49   new_address = (address + mask) & (~mask);
  50   return (new_address - address);
  51 }
  52
  53 /* Calculate the size of the frag chain
  54    and create a bfd section to contain all of it.  */
  55
  56 static void
  57 size_section (abfd, idx)
  58      bfd *abfd;
  59      unsigned int idx;
  60 {
  61   asection *sec;
  62   unsigned int size = 0;
  63   fragS *frag = segment_info[idx].frag_root;
  64
  65   while (frag)
  66     {
  67       if (frag->fr_address != size)
  68         {
  69           printf (_("Out of step\n"));
  70           size = frag->fr_address;
  71         }
  72       size += frag->fr_fix;
  73       switch (frag->fr_type)
  74         {
  75         case rs_fill:
  76         case rs_org:
  77           size += frag->fr_offset * frag->fr_var;
  78           break;
  79         case rs_align:
  80         case rs_align_code:
  81           {
  82             addressT off;
  83
  84             off = relax_align (size, frag->fr_offset);
  85             if (frag->fr_subtype != 0 && off > frag->fr_subtype)
  86               off = 0;
  87             size += off;
  88           }
  89         }
  90       frag = frag->fr_next;
  91     }
  92   if (size)
  93     {
  94       char *name = segment_info[idx].name;
  95
  96       if (name == (char *) NULL)
  97         name = ".data";
  98
  99       segment_info[idx].user_stuff =
 100         (char *) (sec = bfd_make_section (abfd, name));
 101       /* Make it output through itself.  */
 102       sec->output_section = sec;
 103       sec->flags |= SEC_HAS_CONTENTS;
 104       bfd_set_section_size (abfd, sec, size);
 105     }
 106 }
 107
 108 /* Run through a frag chain and write out the data to go with it.  */
 109
 110 static void
 111 fill_section (abfd, idx)
 112      bfd *abfd;
 113      unsigned int idx;
 114 {
 115   asection *sec = segment_info[idx].user_stuff;
 116
 117   if (sec)
 118     {
 119       fragS *frag = segment_info[idx].frag_root;
 120       unsigned int offset = 0;
 121       while (frag)
 122         {
 123           unsigned int fill_size;
 124           unsigned int count;
 125           switch (frag->fr_type)
 126             {
 127             case rs_fill:
 128             case rs_align:
 129             case rs_org:
 130               if (frag->fr_fix)
 131                 {
 132                   bfd_set_section_contents (abfd,
 133                                             sec,
 134                                             frag->fr_literal,
 135                                             frag->fr_address,
 136                                             frag->fr_fix);
 137                 }
 138               offset += frag->fr_fix;
 139               fill_size = frag->fr_var;
 140               if (fill_size)
 141                 {
 142                   unsigned int off = frag->fr_fix;
 143                   for (count = frag->fr_offset; count; count--)
 144                     {
 145                       bfd_set_section_contents (abfd, sec,
 146                                                 frag->fr_literal +
 147                                                 frag->fr_fix,
 148                                                 frag->fr_address + off,
 149                                                 fill_size);
 150                       off += fill_size;
 151                     }
 152                 }
 153               break;
 154             default:
 155               abort ();
 156             }
 157           frag = frag->fr_next;
 158         }
 159     }
 160 }
 161
 162 /* Count the relocations in a chain.  */
 163
 164 static unsigned int
 165 count_entries_in_chain (idx)
 166      unsigned int idx;
 167 {
 168   unsigned int nrelocs;
 169   fixS *fixup_ptr;
 170
 171   /* Count the relocations.  */
 172   fixup_ptr = segment_info[idx].fix_root;
 173   nrelocs = 0;
 174   while (fixup_ptr != (fixS *) NULL)
 175     {
 176       fixup_ptr = fixup_ptr->fx_next;
 177       nrelocs++;
 178     }
 179   return nrelocs;
 180 }
 181
 182 /* Output all the relocations for a section.  */
 183
 184 void
 185 do_relocs_for (idx)
 186      unsigned int idx;
 187 {
 188   unsigned int nrelocs;
 189   arelent **reloc_ptr_vector;
 190   arelent *reloc_vector;
 191   asymbol **ptrs;
 192   asection *section = (asection *) (segment_info[idx].user_stuff);
 193   unsigned int i;
 194   fixS *from;
 195
 196   if (section)
 197     {
 198       nrelocs = count_entries_in_chain (idx);
 199
 200       reloc_ptr_vector =
 201         (arelent **) malloc ((nrelocs + 1) * sizeof (arelent *));
 202       reloc_vector = (arelent *) malloc (nrelocs * sizeof (arelent));
 203       ptrs = (asymbol **) malloc (nrelocs * sizeof (asymbol *));
 204       from = segment_info[idx].fix_root;
 205       for (i = 0; i < nrelocs; i++)
 206         {
 207           arelent *to = reloc_vector + i;
 208           asymbol *s;
 209           reloc_ptr_vector[i] = to;
 210           to->howto = (reloc_howto_type *) (from->fx_r_type);
 211
 212           s = &(from->fx_addsy->sy_symbol.sy);
 213           to->address = ((char *) (from->fx_frag->fr_address +
 214                                    from->fx_where))
 215             - ((char *) (&(from->fx_frag->fr_literal)));
 216           to->addend = from->fx_offset;
 217           /* If we know the symbol which we want to relocate to, turn
 218              this reloaction into a section relative.
 219
 220              If this relocation is pcrelative, and we know the
 221              destination, we still want to keep the relocation - since
 222              the linker might relax some of the bytes, but it stops
 223              being pc relative and turns into an absolute relocation.  */
 224           if (s)
 225             {
 226               if ((s->flags & BSF_UNDEFINED) == 0)
 227                 {
 228                   to->section = s->section;
 229
 230                   /* We can refer directly to the value field here,
 231                      rather than using S_GET_VALUE, because this is
 232                      only called after do_symbols, which sets up the
 233                      value field.  */
 234                   to->addend += s->value;
 235
 236                   to->sym_ptr_ptr = 0;
 237                   if (to->howto->pcrel_offset)
 238                     /* This is a pcrel relocation, the addend should
 239                        be adjusted.  */
 240                     to->addend -= to->address + 1;
 241                 }
 242               else
 243                 {
 244                   to->section = 0;
 245                   *ptrs = &(from->fx_addsy->sy_symbol.sy);
 246                   to->sym_ptr_ptr = ptrs;
 247
 248                   if (to->howto->pcrel_offset)
 249                     /* This is a pcrel relocation, the addend should
 250                        be adjusted.  */
 251                     to->addend -= to->address - 1;
 252                 }
 253             }
 254           else
 255             to->section = 0;
 256
 257           ptrs++;
 258           from = from->fx_next;
 259         }
 260
 261       /* Attach to the section.  */
 262       section->orelocation = reloc_ptr_vector;
 263       section->reloc_count = nrelocs;
 264       section->flags |= SEC_LOAD;
 265     }
 266 }
 267
 268 /* Do the symbols.  */
 269
 270 static void
 271 do_symbols (abfd)
 272      bfd *abfd;
 273 {
 274   extern symbolS *symbol_rootP;
 275   symbolS *ptr;
 276   asymbol **symbol_ptr_vec;
 277   asymbol *symbol_vec;
 278   unsigned int count = 0;
 279   unsigned int index;
 280
 281   for (ptr = symbol_rootP;
 282        ptr != (symbolS *) NULL;
 283        ptr = ptr->sy_next)
 284     {
 285       if (SEG_NORMAL (ptr->sy_symbol.seg))
 286         {
 287           ptr->sy_symbol.sy.section =
 288             (asection *) (segment_info[ptr->sy_symbol.seg].user_stuff);
 289           S_SET_VALUE (ptr, S_GET_VALUE (ptr));
 290           if (ptr->sy_symbol.sy.flags == 0)
 291             ptr->sy_symbol.sy.flags = BSF_LOCAL;
 292         }
 293       else
 294         {
 295           switch (ptr->sy_symbol.seg)
 296             {
 297             case SEG_ABSOLUTE:
 298               ptr->sy_symbol.sy.flags |= BSF_ABSOLUTE;
 299               ptr->sy_symbol.sy.section = 0;
 300               break;
 301             case SEG_UNKNOWN:
 302               ptr->sy_symbol.sy.flags = BSF_UNDEFINED;
 303               ptr->sy_symbol.sy.section = 0;
 304               break;
 305             default:
 306               abort ();
 307             }
 308         }
 309       ptr->sy_symbol.sy.value = S_GET_VALUE (ptr);
 310       count++;
 311     }
 312   symbol_ptr_vec = (asymbol **) malloc ((count + 1) * sizeof (asymbol *));
 313
 314   index = 0;
 315   for (ptr = symbol_rootP;
 316        ptr != (symbolS *) NULL;
 317        ptr = ptr->sy_next)
 318     {
 319       symbol_ptr_vec[index] = &(ptr->sy_symbol.sy);
 320       index++;
 321     }
 322   symbol_ptr_vec[index] = 0;
 323   abfd->outsymbols = symbol_ptr_vec;
 324   abfd->symcount = count;
 325 }
 326
 327 /* The generic as->bfd converter. Other backends may have special case
 328    code.  */
 329
 330 void
 331 bfd_as_write_hook ()
 332 {
 333   int i;
 334
 335   for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 336     size_section (abfd, i);
 337
 338   for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 339     fill_section (abfd, i);
 340
 341   do_symbols (abfd);
 342
 343   for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 344     do_relocs_for (i);
 345 }
 346
 347 S_SET_SEGMENT (x, y)
 348      symbolS *x;
 349      int y;
 350 {
 351   x->sy_symbol.seg = y;
 352 }
 353
 354 S_IS_DEFINED (x)
 355      symbolS *x;
 356 {
 357   if (SEG_NORMAL (x->sy_symbol.seg))
 358     {
 359       return 1;
 360     }
 361   switch (x->sy_symbol.seg)
 362     {
 363     case SEG_UNKNOWN:
 364       return 0;
 365     default:
 366       abort ();
 367     }
 368 }
 369
 370 S_IS_EXTERNAL (x)
 371 {
 372   abort ();
 373 }
 374
 375 S_GET_DESC (x)
 376 {
 377   abort ();
 378 }
 379
 380 S_GET_SEGMENT (x)
 381      symbolS *x;
 382 {
 383   return x->sy_symbol.seg;
 384 }
 385
 386 S_SET_EXTERNAL (x)
 387      symbolS *x;
 388 {
 389   x->sy_symbol.sy.flags |= BSF_GLOBAL | BSF_EXPORT;
 390 }
 391
 392 S_SET_NAME (x, y)
 393      symbolS *x;
 394      char *y;
 395 {
 396   x->sy_symbol.sy.name = y;
 397 }
 398
 399 S_GET_OTHER (x)
 400 {
 401   abort ();
 402 }
 403
 404 S_IS_DEBUG (x)
 405 {
 406   abort ();
 407 }
 408
 409 #ifndef segment_name
 410 char *
 411 segment_name ()
 412 {
 413   abort ();
 414 }
 415 #endif
 416
 417 void
 418 obj_read_begin_hook ()
 419 {
 420 }
 421
 422 static void
 423 obj_ieee_section (ignore)
 424      int ignore;
 425 {
 426   extern char *input_line_pointer;
 427   extern char is_end_of_line[];
 428   char *p = input_line_pointer;
 429   char *s = p;
 430   int i;
 431
 432   /* Look up the name, if it doesn't exist, make it.  */
 433   while (*p && *p != ' ' && *p != ',' && !is_end_of_line[*p])
 434     {
 435       p++;
 436     }
 437   for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 438     {
 439       if (segment_info[i].hadone)
 440         {
 441           if (strncmp (segment_info[i].name, s, p - s) == 0)
 442             goto ok;
 443         }
 444       else
 445         break;
 446     }
 447   if (i == SEG_UNKNOWN)
 448     {
 449       as_bad (_("too many sections"));
 450       return;
 451     }
 452
 453   segment_info[i].hadone = 1;
 454   segment_info[i].name = malloc (p - s + 1);
 455   memcpy (segment_info[i].name, s, p - s);
 456   segment_info[i].name[p - s] = 0;
 457 ok:
 458   subseg_set (i, 0);
 459   while (!is_end_of_line[*p])
 460     p++;
 461   input_line_pointer = p;
 462 }
 463
 464 const pseudo_typeS obj_pseudo_table[] =
 465 {
 466   {"section", obj_ieee_section, 0},
 467   {"data.b" , cons            , 1},
 468   {"data.w" , cons            , 2},
 469   {"data.l" , cons            , 4},
 470   {"export" , s_globl         , 0},
 471   {"option" , s_ignore        , 0},
 472   {"end"    , s_ignore        , 0},
 473   {"import" , s_ignore        , 0},
 474   {"sdata"  , stringer        , 0},
 475   0,
 476 };
 477
 478 void
 479 obj_symbol_new_hook (symbolP)
 480      symbolS *symbolP;
 481 {
 482   symbolP->sy_symbol.sy.the_bfd = abfd;
 483 }
 484
 485 #if 1
 486
 487 #ifndef SUB_SEGMENT_ALIGN
 488 #ifdef HANDLE_ALIGN
 489 /* The last subsegment gets an alignment corresponding to the alignment
 490    of the section.  This allows proper nop-filling at the end of
 491    code-bearing sections.  */
 492 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN)                                 \
 493   (!(FRCHAIN)->frch_next || (FRCHAIN)->frch_next->frch_seg != (SEG)     \
 494    ? get_recorded_alignment (SEG) : 0)
 495 #else
 496 #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 2
 497 #endif
 498 #endif
 499
 500 extern void
 501 write_object_file ()
 502 {
 503   int i;
 504   struct frchain *frchain_ptr;
 505   struct frag *frag_ptr;
 506
 507   abfd = bfd_openw (out_file_name, "ieee");
 508
 509   if (abfd == 0)
 510     {
 511       as_perror (_("FATAL: Can't create %s"), out_file_name);
 512       exit (EXIT_FAILURE);
 513     }
 514   bfd_set_format (abfd, bfd_object);
 515   bfd_set_arch_mach (abfd, bfd_arch_h8300, 0);
 516   subseg_set (1, 0);
 517   subseg_set (2, 0);
 518   subseg_set (3, 0);
 519
 520   /* Run through all the sub-segments and align them up.  Also
 521      close any open frags.  We tack a .fill onto the end of the
 522      frag chain so that any .align's size can be worked by looking
 523      at the next frag.  */
 524   for (frchain_ptr = frchain_root;
 525        frchain_ptr != (struct frchain *) NULL;
 526        frchain_ptr = frchain_ptr->frch_next)
 527     {
 528       int alignment;
 529
 530       subseg_set (frchain_ptr->frch_seg, frchain_ptr->frch_subseg);
 531
 532       alignment = SUB_SEGMENT_ALIGN (now_seg, frchain_ptr)
 533
 534 #ifdef md_do_align
 535       md_do_align (alignment, (char *) NULL, 0, 0, alignment_done);
 536 #endif
 537       if (subseg_text_p (now_seg))
 538         frag_align_code (alignment, 0);
 539       else
 540         frag_align (alignment, 0, 0);
 541
 542 #ifdef md_do_align
 543     alignment_done:
 544 #endif
 545
 546       frag_wane (frag_now);
 547       frag_now->fr_fix = 0;
 548       know (frag_now->fr_next == NULL);
 549     }
 550
 551   /* Now build one big frag chain for each segment, linked through
 552      fr_next.  */
 553   for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 554     {
 555       fragS **prev_frag_ptr_ptr;
 556       struct frchain *next_frchain_ptr;
 557
 558       segment_info[i].frag_root = segment_info[i].frchainP->frch_root;
 559     }
 560
 561   for (i = SEG_E0; i < SEG_UNKNOWN; i++)
 562     relax_segment (segment_info[i].frag_root, i);
 563
 564   /* Relaxation has completed.  Freeze all syms.  */
 565   finalize_syms = 1;
 566
 567   /* Now the addresses of the frags are correct within the segment.  */
 568
 569   bfd_as_write_hook ();
 570   bfd_close (abfd);
 571 }
 572
 573 #endif
 574
 575 H_SET_TEXT_SIZE (a, b)
 576 {
 577   abort ();
 578 }
 579
 580 H_GET_TEXT_SIZE ()
 581 {
 582   abort ();
 583 }
 584
 585 H_SET_BSS_SIZE ()
 586 {
 587   abort ();
 588 }
 589
 590 H_SET_STRING_SIZE ()
 591 {
 592   abort ();
 593 }
 594
 595 H_SET_RELOCATION_SIZE ()
 596 {
 597   abort ();
 598 }
 599
 600 H_SET_MAGIC_NUMBER ()
 601 {
 602   abort ();
 603 }
 604
 605 H_GET_FILE_SIZE ()
 606 {
 607   abort ();
 608 }
 609
 610 H_GET_TEXT_RELOCATION_SIZE ()
 611 {
 612   abort ();
 613 }