gas/config/obj-aout.c

   1 /* a.out object file format
   2    Copyright (C) 1989, 1990, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GAS, the GNU Assembler.
   5
   6 GAS is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as
   8 published by the Free Software Foundation; either version 2,
   9 or (at your option) any later version.
  10
  11 GAS is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  14 the GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public
  17 License along with GAS; see the file COPYING.  If not, write
  18 to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  19
  20 #include "as.h"
  21 #ifdef BFD_ASSEMBLER
  22 #include "aout/aout64.h"
  23 #endif
  24 #include "obstack.h"
  25
  26 #ifndef BFD_ASSEMBLER
  27 /* in: segT   out: N_TYPE bits */
  28 const short seg_N_TYPE[] =
  29 {
  30   N_ABS,
  31   N_TEXT,
  32   N_DATA,
  33   N_BSS,
  34   N_UNDF,                       /* unknown */
  35   N_UNDF,                       /* error */
  36   N_UNDF,                       /* expression */
  37   N_UNDF,                       /* debug */
  38   N_UNDF,                       /* ntv */
  39   N_UNDF,                       /* ptv */
  40   N_REGISTER,                   /* register */
  41 };
  42
  43 const segT N_TYPE_seg[N_TYPE + 2] =
  44 {                               /* N_TYPE == 0x1E = 32-2 */
  45   SEG_UNKNOWN,                  /* N_UNDF == 0 */
  46   SEG_GOOF,
  47   SEG_ABSOLUTE,                 /* N_ABS == 2 */
  48   SEG_GOOF,
  49   SEG_TEXT,                     /* N_TEXT == 4 */
  50   SEG_GOOF,
  51   SEG_DATA,                     /* N_DATA == 6 */
  52   SEG_GOOF,
  53   SEG_BSS,                      /* N_BSS == 8 */
  54   SEG_GOOF,
  55   SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  56   SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  57   SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  58   SEG_REGISTER,                 /* dummy N_REGISTER for regs = 30 */
  59   SEG_GOOF,
  60 };
  61 #endif
  62
  63 static void obj_aout_line PARAMS ((int));
  64
  65 const pseudo_typeS obj_pseudo_table[] =
  66 {
  67   {"line", obj_aout_line, 0},   /* source code line number */
  68   {"ln", obj_aout_line, 0},     /* coff line number that we use anyway */
  69
  70   /* coff debug pseudos (ignored) */
  71   {"def", s_ignore, 0},
  72   {"dim", s_ignore, 0},
  73   {"endef", s_ignore, 0},
  74   {"ident", s_ignore, 0},
  75   {"line", s_ignore, 0},
  76   {"ln", s_ignore, 0},
  77   {"scl", s_ignore, 0},
  78   {"size", s_ignore, 0},
  79   {"tag", s_ignore, 0},
  80   {"type", s_ignore, 0},
  81   {"val", s_ignore, 0},
  82   {"version", s_ignore, 0},
  83
  84   {"optim", s_ignore, 0},       /* For sun386i cc (?) */
  85
  86   /* other stuff */
  87   {"ABORT", s_abort, 0},
  88
  89   {NULL}                        /* end sentinel */
  90 };                              /* obj_pseudo_table */
  91
  92
  93 #ifdef BFD_ASSEMBLER
  94
  95 void
  96 obj_aout_frob_symbol (sym, punt)
  97      symbolS *sym;
  98      int *punt;
  99 {
 100   flagword flags;
 101   asection *sec;
 102   int desc, type, other;
 103
 104   flags = sym->bsym->flags;
 105   desc = S_GET_DESC (sym);
 106   type = S_GET_TYPE (sym);
 107   other = S_GET_OTHER (sym);
 108   sec = sym->bsym->section;
 109
 110   /* Only frob simple symbols this way right now.  */
 111   if (! (type & ~ (N_TYPE | N_EXT)))
 112     {
 113       if (type == (N_UNDF | N_EXT)
 114           && sec == &bfd_abs_section)
 115         sym->bsym->section = sec = &bfd_und_section;
 116
 117       if ((type & N_TYPE) != N_INDR
 118           && (sec == &bfd_abs_section
 119               || sec == &bfd_und_section))
 120         return;
 121       if (flags & BSF_EXPORT)
 122         type |= N_EXT;
 123
 124       switch (type & N_TYPE)
 125         {
 126         case N_SETA:
 127         case N_SETT:
 128         case N_SETD:
 129         case N_SETB:
 130           /* Set the debugging flag for constructor symbols so that
 131              BFD leaves them alone.  */
 132           sym->bsym->flags |= BSF_DEBUGGING;
 133           break;
 134         case N_INDR:
 135           /* Put indirect symbols in the indirect section.  */
 136           sym->bsym->section = &bfd_ind_section;
 137           sym->bsym->flags |= BSF_INDIRECT;
 138           break;
 139         }
 140     }
 141   else
 142     {
 143       sym->bsym->flags |= BSF_DEBUGGING;
 144     }
 145
 146   S_SET_TYPE (sym, type);
 147 }
 148
 149 #else
 150
 151 /* Relocation. */
 152
 153 /*
 154  *              emit_relocations()
 155  *
 156  * Crawl along a fixS chain. Emit the segment's relocations.
 157  */
 158 void
 159 obj_emit_relocations (where, fixP, segment_address_in_file)
 160      char **where;
 161      fixS *fixP;                /* Fixup chain for this segment. */
 162      relax_addressT segment_address_in_file;
 163 {
 164   for (; fixP; fixP = fixP->fx_next)
 165     if (fixP->fx_addsy != NULL)
 166       {
 167         tc_aout_fix_to_chars (*where, fixP, segment_address_in_file);
 168         *where += md_reloc_size;
 169       }
 170 }
 171
 172 #ifndef obj_header_append
 173 /* Aout file generation & utilities */
 174 void
 175 obj_header_append (where, headers)
 176      char **where;
 177      object_headers *headers;
 178 {
 179   tc_headers_hook (headers);
 180
 181 #ifdef CROSS_COMPILE
 182   md_number_to_chars (*where, headers->header.a_info, sizeof (headers->header.a_info));
 183   *where += sizeof (headers->header.a_info);
 184   md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text));
 185   *where += sizeof (headers->header.a_text);
 186   md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data));
 187   *where += sizeof (headers->header.a_data);
 188   md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss));
 189   *where += sizeof (headers->header.a_bss);
 190   md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms));
 191   *where += sizeof (headers->header.a_syms);
 192   md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry));
 193   *where += sizeof (headers->header.a_entry);
 194   md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize));
 195   *where += sizeof (headers->header.a_trsize);
 196   md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize));
 197   *where += sizeof (headers->header.a_drsize);
 198
 199 #else /* CROSS_COMPILE */
 200
 201   append (where, (char *) &headers->header, sizeof (headers->header));
 202 #endif /* CROSS_COMPILE */
 203
 204 }
 205 #endif
 206
 207 void
 208 obj_symbol_to_chars (where, symbolP)
 209      char **where;
 210      symbolS *symbolP;
 211 {
 212   md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP)));
 213   md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP)));
 214   md_number_to_chars ((char *) &(symbolP->sy_symbol.n_value), S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value));
 215
 216   append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type));
 217 }
 218
 219 void
 220 obj_emit_symbols (where, symbol_rootP)
 221      char **where;
 222      symbolS *symbol_rootP;
 223 {
 224   symbolS *symbolP;
 225
 226   /* Emit all symbols left in the symbol chain.  */
 227   for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
 228     {
 229       /* Used to save the offset of the name. It is used to point
 230          to the string in memory but must be a file offset. */
 231       register char *temp;
 232
 233       temp = S_GET_NAME (symbolP);
 234       S_SET_OFFSET (symbolP, symbolP->sy_name_offset);
 235
 236       /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
 237       if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP))
 238         S_SET_EXTERNAL (symbolP);
 239
 240       obj_symbol_to_chars (where, symbolP);
 241       S_SET_NAME (symbolP, temp);
 242     }
 243 }
 244
 245 #endif /* ! BFD_ASSEMBLER */
 246
 247 static void
 248 obj_aout_line (ignore)
 249      int ignore;
 250 {
 251   /* Assume delimiter is part of expression.
 252      BSD4.2 as fails with delightful bug, so we
 253      are not being incompatible here. */
 254   new_logical_line ((char *) NULL, (int) (get_absolute_expression ()));
 255   demand_empty_rest_of_line ();
 256 }                               /* obj_aout_line() */
 257
 258 void
 259 obj_read_begin_hook ()
 260 {
 261 }
 262
 263 #ifndef BFD_ASSEMBLER
 264
 265 void
 266 obj_crawl_symbol_chain (headers)
 267      object_headers *headers;
 268 {
 269   symbolS *symbolP;
 270   symbolS **symbolPP;
 271   int symbol_number = 0;
 272
 273   tc_crawl_symbol_chain (headers);
 274
 275   symbolPP = &symbol_rootP;     /*->last symbol chain link. */
 276   while ((symbolP = *symbolPP) != NULL)
 277     {
 278       if (flagseen['R'] && (S_GET_SEGMENT (symbolP) == SEG_DATA))
 279         {
 280           S_SET_SEGMENT (symbolP, SEG_TEXT);
 281         }                       /* if pusing data into text */
 282
 283       resolve_symbol_value (symbolP);
 284
 285       /* OK, here is how we decide which symbols go out into the brave
 286          new symtab.  Symbols that do are:
 287
 288          * symbols with no name (stabd's?)
 289          * symbols with debug info in their N_TYPE
 290
 291          Symbols that don't are:
 292          * symbols that are registers
 293          * symbols with \1 as their 3rd character (numeric labels)
 294          * "local labels" as defined by S_LOCAL_NAME(name) if the -L
 295          switch was passed to gas.
 296
 297          All other symbols are output.  We complain if a deleted
 298          symbol was marked external. */
 299
 300
 301       if (!S_IS_REGISTER (symbolP)
 302           && (!S_GET_NAME (symbolP)
 303               || S_IS_DEBUG (symbolP)
 304 #ifdef TC_I960
 305       /* FIXME-SOON this ifdef seems highly dubious to me.  xoxorich. */
 306               || !S_IS_DEFINED (symbolP)
 307               || S_IS_EXTERNAL (symbolP)
 308 #endif /* TC_I960 */
 309               || (S_GET_NAME (symbolP)[0] != '\001' && (flagseen['L'] || !S_LOCAL_NAME (symbolP)))))
 310         {
 311           symbolP->sy_number = symbol_number++;
 312
 313           /* The + 1 after strlen account for the \0 at the
 314                            end of each string */
 315           if (!S_IS_STABD (symbolP))
 316             {
 317               /* Ordinary case. */
 318               symbolP->sy_name_offset = string_byte_count;
 319               string_byte_count += strlen (S_GET_NAME (symbolP)) + 1;
 320             }
 321           else                  /* .Stabd case. */
 322             symbolP->sy_name_offset = 0;
 323           symbolPP = &(symbol_next (symbolP));
 324         }
 325       else
 326         {
 327           if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP))
 328             {
 329               as_bad ("Local symbol %s never defined.", decode_local_label_name (S_GET_NAME (symbolP)));
 330             }                   /* oops. */
 331
 332           /* Unhook it from the chain */
 333           *symbolPP = symbol_next (symbolP);
 334         }                       /* if this symbol should be in the output */
 335     }                           /* for each symbol */
 336
 337   H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number);
 338 }
 339
 340 /*
 341  * Find strings by crawling along symbol table chain.
 342  */
 343
 344 void
 345 obj_emit_strings (where)
 346      char **where;
 347 {
 348   symbolS *symbolP;
 349
 350 #ifdef CROSS_COMPILE
 351   /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
 352   md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count));
 353   *where += sizeof (string_byte_count);
 354 #else /* CROSS_COMPILE */
 355   append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count));
 356 #endif /* CROSS_COMPILE */
 357
 358   for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP))
 359     {
 360       if (S_GET_NAME (symbolP))
 361         append (&next_object_file_charP, S_GET_NAME (symbolP),
 362                 (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1));
 363     }                           /* walk symbol chain */
 364 }
 365
 366 #ifndef AOUT_VERSION
 367 #define AOUT_VERSION 0
 368 #endif
 369
 370 void
 371 obj_pre_write_hook (headers)
 372      object_headers *headers;
 373 {
 374   H_SET_DYNAMIC (headers, 0);
 375   H_SET_VERSION (headers, AOUT_VERSION);
 376   H_SET_MACHTYPE (headers, AOUT_MACHTYPE);
 377   tc_aout_pre_write_hook (headers);
 378 }
 379
 380 void
 381 DEFUN_VOID (s_sect)
 382 {
 383   /* Strip out the section name */
 384   char *section_name;
 385   char *section_name_end;
 386   char c;
 387
 388   unsigned int len;
 389   unsigned int exp;
 390   char *save;
 391
 392   section_name = input_line_pointer;
 393   c = get_symbol_end ();
 394   section_name_end = input_line_pointer;
 395
 396   len = section_name_end - section_name;
 397   input_line_pointer++;
 398   save = input_line_pointer;
 399
 400   SKIP_WHITESPACE ();
 401   if (c == ',')
 402     {
 403       exp = get_absolute_expression ();
 404     }
 405   else if (*input_line_pointer == ',')
 406     {
 407       input_line_pointer++;
 408       exp = get_absolute_expression ();
 409     }
 410   else
 411     {
 412       input_line_pointer = save;
 413       exp = 0;
 414     }
 415   if (exp >= 1000)
 416     {
 417       as_bad ("subsegment index too high");
 418     }
 419
 420   if (strcmp (section_name, ".text") == 0)
 421     {
 422       subseg_set (SEG_TEXT, (subsegT) exp);
 423     }
 424
 425   if (strcmp (section_name, ".data") == 0)
 426     {
 427       if (flagseen['R'])
 428         subseg_set (SEG_TEXT, (subsegT) exp + 1000);
 429       else
 430         subseg_set (SEG_DATA, (subsegT) exp);
 431     }
 432
 433   *section_name_end = c;
 434 }
 435
 436 #endif /* ! BFD_ASSEMBLER */
 437
 438 /* end of obj-aout.c */