bfd/evax-egsd.c

   1 /* evax-egsd.c -- BFD back-end for ALPHA EVAX (openVMS/AXP) files.
   2    Copyright 1996 Free Software Foundation Inc.
   3
   4    go and read the openVMS linker manual (esp. appendix B)
   5    if you don't know what's going on here :-)
   6
   7    Written by Klaus Kämpf (kkaempf@progis.de)
   8    of proGIS Softwareentwicklung, Aachen, Germany
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2 of the License, or
  13 (at your option) any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software
  22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24
  25 #include <stdio.h>
  26 #include <ctype.h>
  27
  28 #include "bfd.h"
  29 #include "sysdep.h"
  30 #include "bfdlink.h"
  31 #include "libbfd.h"
  32
  33 #include "evax.h"
  34
  35 /*-----------------------------------------------------------------------------*/
  36
  37 /* sections every evax object file has  */
  38
  39 #define EVAX_ABS_NAME           "$ABS$"
  40 #define EVAX_CODE_NAME          "$CODE$"
  41 #define EVAX_LINK_NAME          "$LINK$"
  42 #define EVAX_DATA_NAME          "$DATA$"
  43 #define EVAX_BSS_NAME           "$BSS$"
  44 #define EVAX_READONLY_NAME      "$READONLY$"
  45 #define EVAX_LITERAL_NAME       "$LITERAL$"
  46
  47 struct sec_flags_struct {
  48   char *name;                   /* name of section */
  49   int eflags_always;
  50   flagword flags_always;        /* flags we set always */
  51   int eflags_hassize;
  52   flagword flags_hassize;       /* flags we set if the section has a size > 0 */
  53 };
  54
  55 /* just a dummy flag array since i don't understand it yet  */
  56
  57 static struct sec_flags_struct evax_section_flags[] = {
  58   { EVAX_ABS_NAME,
  59         (EGPS_S_V_SHR),
  60         (SEC_DATA),
  61         (EGPS_S_V_SHR),
  62         (SEC_IN_MEMORY|SEC_DATA|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_LOAD) },
  63   { EVAX_CODE_NAME,
  64         (EGPS_S_V_PIC|EGPS_S_V_REL|EGPS_S_V_SHR|EGPS_S_V_EXE),
  65         (SEC_CODE),
  66         (EGPS_S_V_PIC|EGPS_S_V_REL|EGPS_S_V_SHR|EGPS_S_V_EXE),
  67         (SEC_IN_MEMORY|SEC_CODE|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_LOAD) },
  68   { EVAX_LINK_NAME,
  69         (EGPS_S_V_REL|EGPS_S_V_RD),
  70         (SEC_DATA|SEC_READONLY),
  71         (EGPS_S_V_REL|EGPS_S_V_RD),
  72         (SEC_IN_MEMORY|SEC_DATA|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_READONLY|SEC_LOAD) },
  73   { EVAX_DATA_NAME,
  74         (EGPS_S_V_REL|EGPS_S_V_RD|EGPS_S_V_WRT),
  75         (SEC_DATA),
  76         (EGPS_S_V_REL|EGPS_S_V_RD|EGPS_S_V_WRT),
  77         (SEC_IN_MEMORY|SEC_DATA|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_LOAD) },
  78   { EVAX_BSS_NAME,
  79         (EGPS_S_V_REL|EGPS_S_V_RD|EGPS_S_V_WRT|EGPS_S_V_NOMOD),
  80         (SEC_NO_FLAGS),
  81         (EGPS_S_V_REL|EGPS_S_V_RD|EGPS_S_V_WRT|EGPS_S_V_NOMOD),
  82         (SEC_IN_MEMORY|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_LOAD) },
  83   { EVAX_READONLY_NAME,
  84         (EGPS_S_V_PIC|EGPS_S_V_REL|EGPS_S_V_SHR|EGPS_S_V_RD),
  85         (SEC_DATA|SEC_READONLY),
  86         (EGPS_S_V_PIC|EGPS_S_V_REL|EGPS_S_V_SHR|EGPS_S_V_RD),
  87         (SEC_IN_MEMORY|SEC_DATA|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_READONLY|SEC_LOAD) },
  88   { EVAX_LITERAL_NAME,
  89         (EGPS_S_V_PIC|EGPS_S_V_REL|EGPS_S_V_SHR|EGPS_S_V_RD),
  90         (SEC_DATA|SEC_READONLY),
  91         (EGPS_S_V_PIC|EGPS_S_V_REL|EGPS_S_V_SHR|EGPS_S_V_RD),
  92         (SEC_IN_MEMORY|SEC_DATA|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_READONLY|SEC_LOAD) },
  93   { NULL,
  94         (EGPS_S_V_REL|EGPS_S_V_RD|EGPS_S_V_WRT),
  95         (SEC_DATA),
  96         (EGPS_S_V_REL|EGPS_S_V_RD|EGPS_S_V_WRT),
  97         (SEC_IN_MEMORY|SEC_DATA|SEC_HAS_CONTENTS|SEC_ALLOC|SEC_LOAD) }
  98 };
  99
 100 /* Retrieve bfd section flags by name and size  */
 101
 102 static flagword
 103 evax_secflag_by_name(name, size)
 104      char *name;
 105      int size;
 106 {
 107   int i = 0;
 108
 109   while (evax_section_flags[i].name != NULL)
 110     {
 111       if (strcmp (name, evax_section_flags[i].name) == 0)
 112         {
 113           if (size > 0)
 114             return evax_section_flags[i].flags_hassize;
 115           else
 116             return evax_section_flags[i].flags_always;
 117         }
 118       i++;
 119     }
 120   if (size > 0)
 121     return evax_section_flags[i].flags_hassize;
 122   return evax_section_flags[i].flags_always;
 123 }
 124
 125
 126 /* Retrieve evax section flags by name and size  */
 127
 128 static flagword
 129 evax_esecflag_by_name(name, size)
 130      char *name;
 131      int size;
 132 {
 133   int i = 0;
 134
 135   while (evax_section_flags[i].name != NULL)
 136     {
 137       if (strcmp (name, evax_section_flags[i].name) == 0)
 138         {
 139           if (size > 0)
 140             return evax_section_flags[i].eflags_hassize;
 141           else
 142             return evax_section_flags[i].eflags_always;
 143         }
 144       i++;
 145     }
 146   if (size > 0)
 147     return evax_section_flags[i].eflags_hassize;
 148   return evax_section_flags[i].eflags_always;
 149 }
 150
 151 /*-----------------------------------------------------------------------------*/
 152 #if EVAX_DEBUG
 153 /* debug */
 154
 155 struct flagdescstruct { char *name; flagword value; };
 156
 157 /* Convert flag to printable string  */
 158
 159 static char *
 160 flag2str(flagdesc, flags)
 161      struct flagdescstruct *flagdesc;
 162      flagword flags;
 163 {
 164
 165   static char res[64];
 166   int next = 0;
 167
 168   res[0] = 0;
 169   while (flagdesc->name != NULL)
 170     {
 171       if ((flags & flagdesc->value) != 0)
 172         {
 173           if (next)
 174             strcat(res, ",");
 175           else
 176             next = 1;
 177           strcat (res, flagdesc->name);
 178         }
 179       flagdesc++;
 180     }
 181   return res;
 182 }
 183 #endif
 184
 185 /*-----------------------------------------------------------------------------*/
 186 /* input routines */
 187
 188 /* Process EGSD record
 189    return 0 on success, -1 on error  */
 190
 191 int
 192 _bfd_evax_slurp_egsd (abfd)
 193      bfd *abfd;
 194 {
 195 #if EVAX_DEBUG
 196   static struct flagdescstruct gpsflagdesc[] =
 197   {
 198     { "PIC", 0x0001 },
 199     { "LIB", 0x0002 },
 200     { "OVR", 0x0004 },
 201     { "REL", 0x0008 },
 202     { "GBL", 0x0010 },
 203     { "SHR", 0x0020 },
 204     { "EXE", 0x0040 },
 205     { "RD",  0x0080 },
 206     { "WRT", 0x0100 },
 207     { "VEC", 0x0200 },
 208     { "NOMOD", 0x0400 },
 209     { "COM", 0x0800 },
 210     { NULL, 0 }
 211   };
 212
 213   static struct flagdescstruct gsyflagdesc[] =
 214   {
 215     { "WEAK", 0x0001 },
 216     { "DEF",  0x0002 },
 217     { "UNI",  0x0004 },
 218     { "REL",  0x0008 },
 219     { "COMM", 0x0010 },
 220     { "VECEP", 0x0020 },
 221     { "NORM", 0x0040 },
 222     { NULL, 0 }
 223   };
 224 #endif
 225
 226   int gsd_type, gsd_size;
 227   asection *section;
 228   unsigned char *evax_rec;
 229   flagword new_flags, old_flags;
 230   char *name;
 231   asymbol *symbol;
 232   evax_symbol_entry *entry;
 233   unsigned long base_addr;
 234   unsigned long align_addr;
 235
 236 #if EVAX_DEBUG
 237   evax_debug (2, "EGSD\n");
 238 #endif
 239
 240   PRIV(evax_rec) += 8;  /* skip type, size, l_temp */
 241   PRIV(rec_size) -= 8;
 242
 243   /* calculate base address for each section  */
 244   base_addr = 0L;
 245
 246   abfd->symcount = 0;
 247
 248   while (PRIV(rec_size) > 0)
 249     {
 250       evax_rec = PRIV(evax_rec);
 251       _bfd_evax_get_header_values (abfd, evax_rec, &gsd_type, &gsd_size);
 252       switch (gsd_type)
 253         {
 254         case EGSD_S_C_PSC:
 255           {
 256             /* program section definition  */
 257
 258             name = _bfd_evax_save_counted_string ((char *)evax_rec+12);
 259             section = bfd_make_section (abfd, name);
 260             if (!section)
 261               return -1;
 262             old_flags = bfd_getl16 (evax_rec + 6);
 263             section->_raw_size = bfd_getl32 (evax_rec + 8);     /* allocation */
 264             new_flags = evax_secflag_by_name (name, section->_raw_size);
 265             if (old_flags & EGPS_S_V_REL)
 266               new_flags |= SEC_RELOC;
 267             if (!bfd_set_section_flags (abfd, section, new_flags))
 268               return -1;
 269             section->alignment_power = evax_rec[4];
 270             align_addr = (1 << section->alignment_power);
 271             if ((base_addr % align_addr) != 0)
 272               base_addr += (align_addr - (base_addr % align_addr));
 273             section->vma = (bfd_vma)base_addr;
 274             base_addr += section->_raw_size;    /* FIXME: should be cooked size */
 275             section->contents = (unsigned char *) malloc (section->_raw_size);
 276             if (section->contents == NULL)
 277               {
 278                 bfd_set_error (bfd_error_no_memory);
 279                 return -1;
 280               }
 281             memset (section->contents, 0, section->_raw_size);
 282 #if EVAX_DEBUG
 283             evax_debug(3, "egsd psc %d (%s, flags %04x=%s) ",
 284                        section->index, name, old_flags, flag2str(gpsflagdesc, old_flags));
 285             evax_debug(3, "%d bytes at 0x%08lx (mem %p)\n",
 286                        section->_raw_size, section->vma, section->contents);
 287 #endif
 288           }
 289           break;
 290
 291         case EGSD_S_C_SYM:
 292           {
 293             /* symbol specification (definition or reference)  */
 294
 295             symbol = _bfd_evax_make_empty_symbol (abfd);
 296             if (symbol == 0)
 297               return -1;
 298
 299             old_flags = bfd_getl16 (evax_rec + 6);
 300             new_flags = BSF_NO_FLAGS;
 301
 302             if (old_flags & EGSY_S_V_WEAK)
 303               new_flags |= BSF_WEAK;
 304
 305             if (evax_rec[6] & EGSY_S_V_DEF)     /* symbol definition */
 306               {
 307                 symbol->name =
 308                   _bfd_evax_save_counted_string ((char *)evax_rec+32);
 309                 if (old_flags & EGSY_S_V_NORM)
 310                   {         /* proc def */
 311                     new_flags |= BSF_FUNCTION;
 312                   }
 313                 symbol->value = bfd_getl64 (evax_rec+8);
 314                 symbol->section = (asection *)((unsigned long) bfd_getl32 (evax_rec+28));
 315 #if EVAX_DEBUG
 316                 evax_debug(3, "egsd sym def #%d (%s, %d, %04x=%s)\n", abfd->symcount,
 317                            symbol->name, (int)symbol->section, old_flags, flag2str(gsyflagdesc, old_flags));
 318 #endif
 319               }
 320             else        /* symbol reference */
 321               {
 322 #if EVAX_DEBUG
 323                 evax_debug(3, "egsd sym ref #%d (%s, %04x=%s)\n", abfd->symcount, evax_rec+9, old_flags, flag2str(gsyflagdesc, old_flags));
 324 #endif
 325                 symbol->name =
 326                   _bfd_evax_save_counted_string ((char *)evax_rec+8);
 327                 symbol->section = bfd_make_section (abfd, BFD_UND_SECTION_NAME);
 328               }
 329
 330             symbol->flags = new_flags;
 331
 332             /* save symbol in evax_symbol_table  */
 333
 334             entry = (evax_symbol_entry *) bfd_hash_lookup (PRIV(evax_symbol_table), symbol->name, true, false);
 335             if (entry == (evax_symbol_entry *)NULL)
 336               {
 337                 bfd_set_error (bfd_error_no_memory);
 338                 return -1;
 339               }
 340             if (entry->symbol != (asymbol *)NULL)
 341               {                                 /* FIXME ?, DEC C generates this */
 342 #if EVAX_DEBUG
 343                 evax_debug(3, "EGSD_S_C_SYM: duplicate \"%s\"\n", symbol->name);
 344 #endif
 345               }
 346             else
 347               {
 348                 entry->symbol = symbol;
 349                 PRIV(egsd_sym_count)++;
 350                 abfd->symcount++;
 351               }
 352           }
 353           break;
 354
 355         case EGSD_S_C_IDC:
 356           break;
 357
 358         default:
 359           (*_bfd_error_handler) ("unknown egsd subtype %d", gsd_type);
 360           bfd_set_error (bfd_error_bad_value);
 361           return -1;
 362
 363         } /* switch */
 364
 365       PRIV(rec_size) -= gsd_size;
 366       PRIV(evax_rec) += gsd_size;
 367
 368     } /* while (recsize > 0) */
 369
 370   if (abfd->symcount > 0)
 371     abfd->flags |= HAS_SYMS;
 372
 373   return 0;
 374 }
 375
 376 /*-----------------------------------------------------------------------------*/
 377 /* output routines */
 378
 379 /* Write section and symbol directory of bfd abfd  */
 380
 381 int
 382 _bfd_evax_write_egsd (abfd)
 383      bfd *abfd;
 384 {
 385   asection *section;
 386   asymbol *symbol;
 387   int symnum;
 388   int last_index = -1;
 389   char dummy_name[10];
 390   char *sname;
 391   flagword new_flags, old_flags;
 392   char uname[200];
 393   char *nptr, *uptr;
 394
 395 #if EVAX_DEBUG
 396   evax_debug (2, "evax_write_egsd(%p)\n", abfd);
 397 #endif
 398
 399   /* output sections  */
 400
 401   section = abfd->sections;
 402 #if EVAX_DEBUG
 403   evax_debug (3, "%d sections found\n", abfd->section_count);
 404 #endif
 405
 406   /* egsd is quadword aligned  */
 407
 408   _bfd_evax_output_alignment (abfd, 8);
 409
 410   _bfd_evax_output_begin (abfd, EOBJ_S_C_EGSD, -1);
 411   _bfd_evax_output_long (abfd, 0);
 412   _bfd_evax_output_push (abfd);         /* prepare output for subrecords */
 413
 414   while (section != 0)
 415     {
 416 #if EVAX_DEBUG
 417   evax_debug (3, "Section #%d %s, %d bytes\n", section->index, section->name, (int)section->_raw_size);
 418 #endif
 419
 420         /* 13 bytes egsd, max 31 chars name -> should be 44 bytes */
 421       if (_bfd_evax_output_check (abfd, 64) < 0)
 422         {
 423           _bfd_evax_output_pop (abfd);
 424           _bfd_evax_output_end (abfd);
 425           _bfd_evax_output_begin (abfd, EOBJ_S_C_EGSD, -1);
 426           _bfd_evax_output_long (abfd, 0);
 427           _bfd_evax_output_push (abfd);         /* prepare output for subrecords */
 428         }
 429
 430         /* Create dummy sections to keep consecutive indices */
 431
 432       while (section->index - last_index > 1)
 433         {
 434 #if EVAX_DEBUG
 435           evax_debug (3, "index %d, last %d\n", section->index, last_index);
 436 #endif
 437           _bfd_evax_output_begin (abfd, EGSD_S_C_PSC, -1);
 438           _bfd_evax_output_short (abfd, 0);
 439           _bfd_evax_output_short (abfd, 0);
 440           _bfd_evax_output_long (abfd, 0);
 441           sprintf (dummy_name, ".DUMMY%02d", last_index);
 442           _bfd_evax_output_counted (abfd, dummy_name);
 443           _bfd_evax_output_flush (abfd);
 444           last_index++;
 445         }
 446
 447       /* Don't know if this is neccesary for the linker but for now it keeps
 448          evax_slurp_egsd happy  */
 449
 450       sname = (char *)section->name;
 451       if (*sname == '.')
 452         {
 453           sname++;
 454           if ((*sname == 't') && (strcmp (sname, "text") == 0))
 455             sname = EVAX_CODE_NAME;
 456           else if ((*sname == 'd') && (strcmp (sname, "data") == 0))
 457             sname = EVAX_DATA_NAME;
 458           else if ((*sname == 'b') && (strcmp (sname, "bss") == 0))
 459             sname = EVAX_BSS_NAME;
 460           else if ((*sname == 'l') && (strcmp (sname, "link") == 0))
 461             sname = EVAX_LINK_NAME;
 462           else if ((*sname == 'r') && (strcmp (sname, "rdata") == 0))
 463             sname = EVAX_READONLY_NAME;
 464           else if ((*sname == 'l') && (strcmp (sname, "literal") == 0))
 465             sname = EVAX_LITERAL_NAME;
 466         }
 467
 468       _bfd_evax_output_begin (abfd, EGSD_S_C_PSC, -1);
 469       _bfd_evax_output_short (abfd, section->alignment_power & 0xff);
 470       _bfd_evax_output_short (abfd,
 471                               evax_esecflag_by_name (sname,
 472                                                      section->_raw_size));
 473       _bfd_evax_output_long (abfd, section->_raw_size);
 474       _bfd_evax_output_counted (abfd, sname);
 475       _bfd_evax_output_flush (abfd);
 476
 477       last_index = section->index;
 478       section = section->next;
 479     }
 480
 481   /* output symbols  */
 482
 483 #if EVAX_DEBUG
 484   evax_debug (3, "%d symbols found\n", abfd->symcount);
 485 #endif
 486
 487   bfd_set_start_address (abfd, (bfd_vma)-1);
 488
 489   for (symnum = 0; symnum < abfd->symcount; symnum++)
 490     {
 491
 492       symbol = abfd->outsymbols[symnum];
 493       if (*(symbol->name) == '_')
 494         {
 495           if (strcmp (symbol->name, "__main") == 0)
 496             bfd_set_start_address (abfd, (bfd_vma)symbol->value);
 497         }
 498       old_flags = symbol->flags;
 499
 500       if (((old_flags & BSF_GLOBAL) == 0)               /* not xdef */
 501           && (!bfd_is_und_section (symbol->section)))   /* and not xref */
 502         continue;                                       /* dont output */
 503
 504       /* 13 bytes egsd, max 64 chars name -> should be 77 bytes  */
 505
 506       if (_bfd_evax_output_check (abfd, 80) < 0)
 507         {
 508           _bfd_evax_output_pop (abfd);
 509           _bfd_evax_output_end (abfd);
 510           _bfd_evax_output_begin (abfd, EOBJ_S_C_EGSD, -1);
 511           _bfd_evax_output_long (abfd, 0);
 512           _bfd_evax_output_push (abfd);         /* prepare output for subrecords */
 513         }
 514
 515       _bfd_evax_output_begin (abfd, EGSD_S_C_SYM, -1);
 516
 517       _bfd_evax_output_short (abfd, 0);                 /* data type, alignment */
 518
 519       new_flags = 0;
 520       if (old_flags & BSF_WEAK)
 521         new_flags |= EGSY_S_V_WEAK;
 522       if (old_flags & BSF_FUNCTION)
 523         {
 524           new_flags |= EGSY_S_V_NORM;
 525           new_flags |= EGSY_S_V_REL;
 526         }
 527       if (old_flags & BSF_GLOBAL)
 528         {
 529           new_flags |= EGSY_S_V_DEF;
 530           if (!bfd_is_abs_section (symbol->section))
 531             new_flags |= EGSY_S_V_REL;
 532         }
 533       _bfd_evax_output_short (abfd, new_flags);
 534
 535       if (old_flags & BSF_GLOBAL)                       /* symbol definition */
 536         {
 537           if (old_flags & BSF_FUNCTION)
 538             {
 539               _bfd_evax_output_quad (abfd, symbol->value);
 540               _bfd_evax_output_quad (abfd,
 541                                      ((asymbol *)(symbol->udata.p))->value);
 542               _bfd_evax_output_long (abfd,
 543                                      (((asymbol *)(symbol->udata.p))
 544                                       ->section->index));
 545               _bfd_evax_output_long (abfd, symbol->section->index);
 546             }
 547           else
 548             {
 549               _bfd_evax_output_quad (abfd, symbol->value);      /* L_VALUE */
 550               _bfd_evax_output_quad (abfd, 0);                  /* L_CODE_ADDRESS */
 551               _bfd_evax_output_long (abfd, 0);                  /* L_CA_PSINDX */
 552               _bfd_evax_output_long (abfd, symbol->section->index);/* L_PSINDX, FIXME */
 553             }
 554         }
 555       if (strlen ((char *)symbol->name) > 198)
 556         {
 557           (*_bfd_error_handler) ("Name '%s' too long\n", symbol->name);
 558           abort ();
 559         }
 560       nptr = (char *)symbol->name;
 561       uptr = uname;
 562       while (*nptr)
 563         {
 564           if (islower (*nptr))
 565             *uptr = toupper (*nptr);
 566           else
 567             *uptr = *nptr;
 568           uptr++;
 569           nptr++;
 570         }
 571       *uptr = 0;
 572       _bfd_evax_output_counted (abfd, uname);
 573
 574       _bfd_evax_output_flush (abfd);
 575
 576     }
 577
 578   _bfd_evax_output_alignment (abfd, 8);
 579   _bfd_evax_output_pop (abfd);
 580   _bfd_evax_output_end (abfd);
 581
 582   return 0;
 583 }