gas/config/obj-aout.c

   1 /* a.out object file format
   2    Copyright (C) 1989, 1990, 1991, 1992 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 #include "aout/stab_gnu.h"
  22 #include "obstack.h"
  23
  24 /* in: segT   out: N_TYPE bits */
  25 const short seg_N_TYPE[] = {
  26         N_ABS,
  27         N_TEXT,
  28         N_DATA,
  29         N_BSS,
  30         N_UNDF, /* unknown */
  31         N_UNDF, /* absent */
  32         N_UNDF, /* pass1 */
  33         N_UNDF, /* error */
  34         N_UNDF, /* bignum/flonum */
  35         N_UNDF, /* difference */
  36         N_UNDF, /* debug */
  37         N_UNDF, /* ntv */
  38         N_UNDF, /* ptv */
  39         N_REGISTER, /* register */
  40 };
  41
  42 const segT N_TYPE_seg [N_TYPE+2] = {    /* N_TYPE == 0x1E = 32-2 */
  43         SEG_UNKNOWN,                    /* N_UNDF == 0 */
  44         SEG_GOOF,
  45         SEG_ABSOLUTE,                   /* N_ABS == 2 */
  46         SEG_GOOF,
  47         SEG_TEXT,                       /* N_TEXT == 4 */
  48         SEG_GOOF,
  49         SEG_DATA,                       /* N_DATA == 6 */
  50         SEG_GOOF,
  51         SEG_BSS,                        /* N_BSS == 8 */
  52         SEG_GOOF,
  53         SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  54         SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  55         SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF,
  56         SEG_REGISTER,                   /* dummy N_REGISTER for regs = 30 */
  57         SEG_GOOF,
  58 };
  59
  60 #if __STDC__ == 1
  61 static void obj_aout_stab(int what);
  62 static void obj_aout_line(void);
  63 static void obj_aout_desc(void);
  64 #else /* not __STDC__ */
  65 static void obj_aout_desc();
  66 static void obj_aout_stab();
  67 static void obj_aout_line();
  68 #endif /* not __STDC__ */
  69
  70 const pseudo_typeS obj_pseudo_table[] = {
  71 #ifndef IGNORE_DEBUG
  72         /* stabs debug info */
  73         { "line",       obj_aout_line,          0       }, /* source code line number */
  74         { "ln",         obj_aout_line,          0       }, /* coff line number that we use anyway */
  75         { "desc",       obj_aout_desc,          0       }, /* desc */
  76         { "stabd",      obj_aout_stab,          'd'     }, /* stabs */
  77         { "stabn",      obj_aout_stab,          'n'     }, /* stabs */
  78         { "stabs",      obj_aout_stab,          's'     }, /* stabs */
  79 #else /* IGNORE_DEBUG */
  80         { "line",       obj_aout_line,          0       }, /* source code line number */
  81         { "ln",         obj_aout_line,          0       }, /* coff line number that we use anyway */
  82         { "desc",       obj_aout_desc,          0       }, /* desc */
  83         { "stabd",      obj_aout_stab,          'd'     }, /* stabs */
  84         { "stabn",      obj_aout_stab,          'n'     }, /* stabs */
  85         { "stabs",      obj_aout_stab,          's'     }, /* stabs */
  86 #endif /* IGNORE_DEBUG */
  87
  88         /* coff debug pseudos (ignored) */
  89         { "def",        s_ignore, 0 },
  90         { "dim",        s_ignore, 0 },
  91         { "endef",      s_ignore, 0 },
  92         { "ident",      s_ignore, 0 },
  93         { "line",       s_ignore, 0 },
  94         { "ln",         s_ignore, 0 },
  95         { "scl",        s_ignore, 0 },
  96         { "size",       s_ignore, 0 },
  97         { "tag",        s_ignore, 0 },
  98         { "type",       s_ignore, 0 },
  99         { "val",        s_ignore, 0 },
 100         { "version",    s_ignore, 0 },
 101
 102         /* stabs-in-coff (?) debug pseudos (ignored) */
 103         { "optim",      s_ignore, 0 }, /* For sun386i cc (?) */
 104
 105         /* other stuff */
 106         { "ABORT",      s_abort,                0 },
 107
 108         { NULL} /* end sentinel */
 109 }; /* obj_pseudo_table */
 110
 111
 112 /* Relocation. */
 113
 114 /*
 115  *              emit_relocations()
 116  *
 117  * Crawl along a fixS chain. Emit the segment's relocations.
 118  */
 119 void obj_emit_relocations(where, fixP, segment_address_in_file)
 120 char **where;
 121 fixS *fixP; /* Fixup chain for this segment. */
 122 relax_addressT segment_address_in_file;
 123 {
 124         for (;  fixP;  fixP = fixP->fx_next) {
 125                 if (fixP->fx_addsy != NULL) {
 126                         tc_aout_fix_to_chars(*where, fixP, segment_address_in_file);
 127                         *where += md_reloc_size;
 128                 } /* if there is an add symbol */
 129         } /* for each fix */
 130
 131         return;
 132 } /* obj_emit_relocations() */
 133
 134 /* Aout file generation & utilities */
 135 void obj_header_append(where, headers)
 136 char **where;
 137 object_headers *headers;
 138 {
 139         tc_headers_hook(headers);
 140
 141 #ifdef CROSS_COMPILE
 142         md_number_to_chars(*where, headers->header.a_info, sizeof(headers->header.a_info));
 143         *where += sizeof(headers->header.a_info);
 144         md_number_to_chars(*where, headers->header.a_text, sizeof(headers->header.a_text));
 145         *where += sizeof(headers->header.a_text);
 146         md_number_to_chars(*where, headers->header.a_data, sizeof(headers->header.a_data));
 147         *where += sizeof(headers->header.a_data);
 148         md_number_to_chars(*where, headers->header.a_bss, sizeof(headers->header.a_bss));
 149         *where += sizeof(headers->header.a_bss);
 150         md_number_to_chars(*where, headers->header.a_syms, sizeof(headers->header.a_syms));
 151         *where += sizeof(headers->header.a_syms);
 152         md_number_to_chars(*where, headers->header.a_entry, sizeof(headers->header.a_entry));
 153         *where += sizeof(headers->header.a_entry);
 154         md_number_to_chars(*where, headers->header.a_trsize, sizeof(headers->header.a_trsize));
 155         *where += sizeof(headers->header.a_trsize);
 156         md_number_to_chars(*where, headers->header.a_drsize, sizeof(headers->header.a_drsize));
 157         *where += sizeof(headers->header.a_drsize);
 158
 159 #else /* CROSS_COMPILE */
 160
 161         append(where, (char *) &headers->header, sizeof(headers->header));
 162 #endif /* CROSS_COMPILE */
 163
 164         return;
 165 } /* obj_append_header() */
 166
 167 void obj_symbol_to_chars(where, symbolP)
 168 char **where;
 169 symbolS *symbolP;
 170 {
 171         md_number_to_chars((char *)&(S_GET_OFFSET(symbolP)), S_GET_OFFSET(symbolP), sizeof(S_GET_OFFSET(symbolP)));
 172         md_number_to_chars((char *)&(S_GET_DESC(symbolP)), S_GET_DESC(symbolP), sizeof(S_GET_DESC(symbolP)));
 173         md_number_to_chars((char *)&(S_GET_VALUE(symbolP)), S_GET_VALUE(symbolP), sizeof(S_GET_VALUE(symbolP)));
 174
 175         append(where, (char *)&symbolP->sy_symbol, sizeof(obj_symbol_type));
 176 } /* obj_symbol_to_chars() */
 177
 178 void obj_emit_symbols(where, symbol_rootP)
 179 char **where;
 180 symbolS *symbol_rootP;
 181 {
 182         symbolS *       symbolP;
 183
 184         /*
 185          * Emit all symbols left in the symbol chain.
 186          */
 187         for(symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) {
 188                 /* Used to save the offset of the name. It is used to point
 189                    to the string in memory but must be a file offset. */
 190                 register char *temp;
 191
 192                 temp = S_GET_NAME(symbolP);
 193                 S_SET_OFFSET(symbolP, symbolP->sy_name_offset);
 194
 195                 /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */
 196                 if (!S_IS_DEBUG(symbolP) && !S_IS_DEFINED(symbolP)) S_SET_EXTERNAL(symbolP);
 197
 198                 obj_symbol_to_chars(where, symbolP);
 199                 S_SET_NAME(symbolP,temp);
 200         }
 201 } /* emit_symbols() */
 202
 203 #if comment
 204 /* uneeded if symbol is born zeroed. */
 205 void obj_symbol_new_hook(symbolP)
 206 symbolS *symbolP;
 207 {
 208         S_SET_OTHER(symbolP, 0);
 209         S_SET_DESC(symbolP, 0);
 210         return;
 211 } /* obj_symbol_new_hook() */
 212 #endif /* comment */
 213
 214 static void obj_aout_line() {
 215         /* Assume delimiter is part of expression. */
 216         /* BSD4.2 as fails with delightful bug, so we */
 217         /* are not being incompatible here. */
 218         new_logical_line((char *)NULL, (int)(get_absolute_expression()));
 219         demand_empty_rest_of_line();
 220 } /* obj_aout_line() */
 221
 222 /*
 223  *                      stab()
 224  *
 225  * Handle .stabX directives, which used to be open-coded.
 226  * So much creeping featurism overloaded the semantics that we decided
 227  * to put all .stabX thinking in one place. Here.
 228  *
 229  * We try to make any .stabX directive legal. Other people's AS will often
 230  * do assembly-time consistency checks: eg assigning meaning to n_type bits
 231  * and "protecting" you from setting them to certain values. (They also zero
 232  * certain bits before emitting symbols. Tut tut.)
 233  *
 234  * If an expression is not absolute we either gripe or use the relocation
 235  * information. Other people's assemblers silently forget information they
 236  * don't need and invent information they need that you didn't supply.
 237  *
 238  * .stabX directives always make a symbol table entry. It may be junk if
 239  * the rest of your .stabX directive is malformed.
 240  */
 241 static void obj_aout_stab(what)
 242 int what;
 243 {
 244         extern int listing;
 245
 246         register symbolS *      symbolP = 0;
 247         register char * string;
 248         int saved_type = 0;
 249         int length;
 250         int goof; /* TRUE if we have aborted. */
 251         long longint;
 252
 253         /*
 254          * Enter with input_line_pointer pointing past .stabX and any following
 255          * whitespace.
 256          */
 257         goof = 0; /* JF who forgot this?? */
 258         if (what == 's') {
 259                 string = demand_copy_C_string(& length);
 260                 SKIP_WHITESPACE();
 261                 if (* input_line_pointer == ',')
 262                     input_line_pointer ++;
 263                 else {
 264                         as_bad("I need a comma after symbol's name");
 265                         goof = 1;
 266                 }
 267         } else
 268             string = "";
 269
 270         /*
 271          * Input_line_pointer->after ','.  String->symbol name.
 272          */
 273         if (! goof) {
 274                 symbolP = symbol_new(string,
 275                                      SEG_UNKNOWN,
 276                                      0,
 277                                      (struct frag *)0);
 278                 switch (what) {
 279                 case 'd':
 280                         S_SET_NAME(symbolP, NULL); /* .stabd feature. */
 281                         S_SET_VALUE(symbolP, obstack_next_free(&frags) - frag_now->fr_literal);
 282                         symbolP->sy_frag = frag_now;
 283                         break;
 284
 285                 case 'n':
 286                         symbolP->sy_frag = &zero_address_frag;
 287                         break;
 288
 289                 case 's':
 290                         symbolP->sy_frag = & zero_address_frag;
 291                         break;
 292
 293                 default:
 294                         BAD_CASE(what);
 295                         break;
 296                 }
 297
 298                 if (get_absolute_expression_and_terminator(&longint) == ',')
 299                     symbolP->sy_symbol.n_type = saved_type = longint;
 300                 else {
 301                         as_bad("I want a comma after the n_type expression");
 302                         goof = 1;
 303                         input_line_pointer --; /* Backup over a non-',' char. */
 304                 }
 305         }
 306
 307         if (!goof) {
 308                 if (get_absolute_expression_and_terminator(&longint) == ',')
 309                     S_SET_OTHER(symbolP, longint);
 310                 else {
 311                         as_bad("I want a comma after the n_other expression");
 312                         goof = 1;
 313                         input_line_pointer--; /* Backup over a non-',' char. */
 314                 }
 315         }
 316
 317         if (!goof) {
 318                 S_SET_DESC(symbolP, get_absolute_expression());
 319                 if (what == 's' || what == 'n') {
 320                         if (*input_line_pointer != ',') {
 321                                 as_bad("I want a comma after the n_desc expression");
 322                                 goof = 1;
 323                         } else {
 324                                 input_line_pointer++;
 325                         }
 326                 }
 327         }
 328
 329         if ((!goof) && (what=='s' || what=='n')) {
 330                 pseudo_set(symbolP);
 331                 symbolP->sy_symbol.n_type = saved_type;
 332         }
 333 #ifndef NO_LISTING
 334         if (listing && !goof)
 335             {
 336                     if (symbolP->sy_symbol.n_type == N_SLINE)
 337                         {
 338
 339                                 listing_source_line(symbolP->sy_symbol.n_desc);
 340                         }
 341                     else if (symbolP->sy_symbol.n_type == N_SO
 342                              || symbolP->sy_symbol.n_type == N_SOL)
 343                         {
 344                                 listing_source_file(string);
 345                         }
 346             }
 347 #endif
 348
 349         if (goof)
 350             ignore_rest_of_line();
 351         else
 352             demand_empty_rest_of_line ();
 353 } /* obj_aout_stab() */
 354
 355 static void obj_aout_desc() {
 356         register char *name;
 357         register char c;
 358         register char *p;
 359         register symbolS *symbolP;
 360         register int temp;
 361
 362         /*
 363          * Frob invented at RMS' request. Set the n_desc of a symbol.
 364          */
 365         name = input_line_pointer;
 366         c = get_symbol_end();
 367         p = input_line_pointer;
 368         * p = c;
 369         SKIP_WHITESPACE();
 370         if (*input_line_pointer != ',') {
 371                 *p = 0;
 372                 as_bad("Expected comma after name \"%s\"", name);
 373                 *p = c;
 374                 ignore_rest_of_line();
 375         } else {
 376                 input_line_pointer ++;
 377                 temp = get_absolute_expression();
 378                 *p = 0;
 379                 symbolP = symbol_find_or_make(name);
 380                 *p = c;
 381                 S_SET_DESC(symbolP,temp);
 382         }
 383         demand_empty_rest_of_line();
 384 } /* obj_aout_desc() */
 385
 386 void obj_read_begin_hook() {
 387         return;
 388 } /* obj_read_begin_hook() */
 389
 390 void obj_crawl_symbol_chain(headers)
 391 object_headers *headers;
 392 {
 393         symbolS *symbolP;
 394         symbolS **symbolPP;
 395         int symbol_number = 0;
 396
 397         /* JF deal with forward references first... */
 398         for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) {
 399                 if (symbolP->sy_forward) {
 400                         S_SET_VALUE(symbolP, S_GET_VALUE(symbolP)
 401                                     + S_GET_VALUE(symbolP->sy_forward)
 402                                     + symbolP->sy_forward->sy_frag->fr_address);
 403
 404                         symbolP->sy_forward=0;
 405                 } /* if it has a forward reference */
 406         } /* walk the symbol chain */
 407
 408         tc_crawl_symbol_chain(headers);
 409
 410         symbolPP = &symbol_rootP;       /*->last symbol chain link. */
 411         while ((symbolP  = *symbolPP) != NULL) {
 412                 if (flagseen['R'] && (S_GET_SEGMENT(symbolP) == SEG_DATA)) {
 413                         S_SET_SEGMENT(symbolP, SEG_TEXT);
 414                 } /* if pusing data into text */
 415
 416                 S_SET_VALUE(symbolP, S_GET_VALUE(symbolP) + symbolP->sy_frag->fr_address);
 417
 418                 /* OK, here is how we decide which symbols go out into the
 419                    brave new symtab.  Symbols that do are:
 420
 421                    * symbols with no name (stabd's?)
 422                    * symbols with debug info in their N_TYPE
 423
 424                    Symbols that don't are:
 425                    * symbols that are registers
 426                    * symbols with \1 as their 3rd character (numeric labels)
 427                    * "local labels" as defined by S_LOCAL_NAME(name)
 428                    if the -L switch was passed to gas.
 429
 430                    All other symbols are output.  We complain if a deleted
 431                    symbol was marked external. */
 432
 433
 434                 if (!S_IS_REGISTER(symbolP)
 435                     && (!S_GET_NAME(symbolP)
 436                         || S_IS_DEBUG(symbolP)
 437 #ifdef TC_I960
 438                         /* FIXME-SOON this ifdef seems highly dubious to me.  xoxorich. */
 439                         || !S_IS_DEFINED(symbolP)
 440                         || S_IS_EXTERNAL(symbolP)
 441 #endif /* TC_I960 */
 442                         || (S_GET_NAME(symbolP)[0] != '\001' && (flagseen ['L'] || ! S_LOCAL_NAME(symbolP))))) {
 443                         symbolP->sy_number = symbol_number++;
 444
 445                         /* The + 1 after strlen account for the \0 at the
 446                            end of each string */
 447                         if (!S_IS_STABD(symbolP)) {
 448                                 /* Ordinary case. */
 449                                 symbolP->sy_name_offset = string_byte_count;
 450                                 string_byte_count += strlen(S_GET_NAME(symbolP)) + 1;
 451                         }
 452                         else    /* .Stabd case. */
 453                             symbolP->sy_name_offset = 0;
 454                         symbolPP = &(symbol_next(symbolP));
 455                 } else {
 456                         if (S_IS_EXTERNAL(symbolP) || !S_IS_DEFINED(symbolP)) {
 457                                 as_bad("Local symbol %s never defined.", decode_local_label_name(S_GET_NAME(symbolP)));
 458                         } /* oops. */
 459
 460                         /* Unhook it from the chain */
 461                         *symbolPP = symbol_next(symbolP);
 462                 } /* if this symbol should be in the output */
 463         } /* for each symbol */
 464
 465         H_SET_SYMBOL_TABLE_SIZE(headers, symbol_number);
 466
 467         return;
 468 } /* obj_crawl_symbol_chain() */
 469
 470 /*
 471  * Find strings by crawling along symbol table chain.
 472  */
 473
 474 void obj_emit_strings(where)
 475 char **where;
 476 {
 477         symbolS *symbolP;
 478
 479 #ifdef CROSS_COMPILE
 480         /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */
 481         md_number_to_chars(*where, string_byte_count, sizeof(string_byte_count));
 482         *where += sizeof(string_byte_count);
 483 #else /* CROSS_COMPILE */
 484         append (where, (char *)&string_byte_count, (unsigned long)sizeof(string_byte_count));
 485 #endif /* CROSS_COMPILE */
 486
 487         for(symbolP = symbol_rootP; symbolP; symbolP = symbol_next(symbolP)) {
 488                 if(S_GET_NAME(symbolP))
 489                     append(&next_object_file_charP, S_GET_NAME(symbolP),
 490                            (unsigned long)(strlen (S_GET_NAME(symbolP)) + 1));
 491         } /* walk symbol chain */
 492
 493         return;
 494 } /* obj_emit_strings() */
 495
 496 void obj_pre_write_hook(headers)
 497 object_headers *headers;
 498 {
 499         H_SET_DYNAMIC(headers, 0);
 500         H_SET_VERSION(headers, 0);
 501         H_SET_MACHTYPE(headers, AOUT_MACHTYPE);
 502         tc_aout_pre_write_hook(headers);
 503         return;
 504 } /* obj_pre_write_hook() */
 505
 506 /*
 507  * Local Variables:
 508  * comment-column: 0
 509  * fill-column: 131
 510  * End:
 511  */
 512
 513 /* end of obj-aout.c */