1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  *      Copyright (c) 1988 AT&T
  24  *        All Rights Reserved
  25  *
  26  *
  27  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  28  */
  29 
  30 /*
  31  * Symbol table management routines
  32  */
  33 
  34 #define ELF_TARGET_AMD64
  35 
  36 #include        <stdio.h>
  37 #include        <string.h>
  38 #include        <debug.h>
  39 #include        "msg.h"
  40 #include        "_libld.h"
  41 
  42 /*
  43  * AVL tree comparator function:
  44  *
  45  * The primary key is the symbol name hash with a secondary key of the symbol
  46  * name itself.
  47  */
  48 int
  49 ld_sym_avl_comp(const void *elem1, const void *elem2)
  50 {
  51         Sym_avlnode     *sav1 = (Sym_avlnode *)elem1;
  52         Sym_avlnode     *sav2 = (Sym_avlnode *)elem2;
  53         int             res;
  54 
  55         res = sav1->sav_hash - sav2->sav_hash;
  56 
  57         if (res < 0)
  58                 return (-1);
  59         if (res > 0)
  60                 return (1);
  61 
  62         /*
  63          * Hash is equal - now compare name
  64          */
  65         res = strcmp(sav1->sav_name, sav2->sav_name);
  66         if (res == 0)
  67                 return (0);
  68         if (res > 0)
  69                 return (1);
  70         return (-1);
  71 }
  72 
  73 /*
  74  * Focal point for verifying symbol names.
  75  */
  76 inline static const char *
  77 string(Ofl_desc *ofl, Ifl_desc *ifl, Sym *sym, const char *strs, size_t strsize,
  78     int symndx, Word shndx, Word symsecndx, const char *symsecname,
  79     const char *strsecname, sd_flag_t *flags)
  80 {
  81         Word    name = sym->st_name;
  82 
  83         if (name) {
  84                 if ((ifl->ifl_flags & FLG_IF_HSTRTAB) == 0) {
  85                         ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_FIL_NOSTRTABLE),
  86                             ifl->ifl_name, EC_WORD(symsecndx), symsecname,
  87                             symndx, EC_XWORD(name));
  88                         return (NULL);
  89                 }
  90                 if (name >= (Word)strsize) {
  91                         ld_eprintf(ofl, ERR_FATAL,
  92                             MSG_INTL(MSG_FIL_EXCSTRTABLE), ifl->ifl_name,
  93                             EC_WORD(symsecndx), symsecname, symndx,
  94                             EC_XWORD(name), strsecname, EC_XWORD(strsize));
  95                         return (NULL);
  96                 }
  97         }
  98 
  99         /*
 100          * Determine if we're dealing with a register and if so validate it.
 101          * If it's a scratch register, a fabricated name will be returned.
 102          */
 103         if (ld_targ.t_ms.ms_is_regsym != NULL) {
 104                 const char *regname = (*ld_targ.t_ms.ms_is_regsym)(ofl, ifl,
 105                     sym, strs, symndx, shndx, symsecname, flags);
 106 
 107                 if (regname == (const char *)S_ERROR) {
 108                         return (NULL);
 109                 }
 110                 if (regname)
 111                         return (regname);
 112         }
 113 
 114         /*
 115          * If this isn't a register, but we have a global symbol with a null
 116          * name, we're not going to be able to hash this, search for it, or
 117          * do anything interesting.  However, we've been accepting a symbol of
 118          * this kind for ages now, so give the user a warning (rather than a
 119          * fatal error), just in case this instance exists somewhere in the
 120          * world and hasn't, as yet, been a problem.
 121          */
 122         if ((name == 0) && (ELF_ST_BIND(sym->st_info) != STB_LOCAL)) {
 123                 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_FIL_NONAMESYM),
 124                     ifl->ifl_name, EC_WORD(symsecndx), symsecname, symndx,
 125                     EC_XWORD(name));
 126         }
 127         return (strs + name);
 128 }
 129 
 130 /*
 131  * For producing symbol names strings to use in error messages.
 132  * If the symbol has a non-null name, then the string returned by
 133  * this function is the output from demangle(), surrounded by
 134  * single quotes. For null names, a descriptive string giving
 135  * the symbol section and index is generated.
 136  *
 137  * This function uses an internal static buffer to hold the resulting
 138  * string. The value returned is usable by the caller until the next
 139  * call, at which point it is overwritten.
 140  */
 141 static const char *
 142 demangle_symname(const char *name, const char *symtab_name, Word symndx)
 143 {
 144 #define INIT_BUFSIZE 256
 145 
 146         static char     *buf;
 147         static size_t   bufsize = 0;
 148         size_t          len;
 149         int             use_name;
 150 
 151         use_name = (name != NULL) && (*name != '\0');
 152 
 153         if (use_name) {
 154                 name = demangle(name);
 155                 len = strlen(name) + 2;   /* Include room for quotes */
 156         } else {
 157                 name = MSG_ORIG(MSG_STR_EMPTY);
 158                 len = strlen(symtab_name) + 2 + CONV_INV_BUFSIZE;
 159         }
 160         len++;                  /* Null termination */
 161 
 162         /* If our buffer is too small, double it until it is big enough */
 163         if (len > bufsize) {
 164                 size_t  new_bufsize = bufsize;
 165                 char    *new_buf;
 166 
 167                 if (new_bufsize == 0)
 168                         new_bufsize = INIT_BUFSIZE;
 169                 while (len > new_bufsize)
 170                         new_bufsize *= 2;
 171                 if ((new_buf = libld_malloc(new_bufsize)) == NULL)
 172                         return (name);
 173                 buf = new_buf;
 174                 bufsize = new_bufsize;
 175         }
 176 
 177         if (use_name) {
 178                 (void) snprintf(buf, bufsize, MSG_ORIG(MSG_FMT_SYMNAM), name);
 179         } else {
 180                 (void) snprintf(buf, bufsize, MSG_ORIG(MSG_FMT_NULLSYMNAM),
 181                     symtab_name, EC_WORD(symndx));
 182         }
 183 
 184         return (buf);
 185 
 186 #undef INIT_BUFSIZE
 187 }
 188 
 189 /*
 190  * Shared objects can be built that define specific symbols that can not be
 191  * directly bound to.  These objects have a syminfo section (and an associated
 192  * DF_1_NODIRECT dynamic flags entry).  Scan this table looking for symbols
 193  * that can't be bound to directly, and if this files symbol is presently
 194  * referenced, mark it so that we don't directly bind to it.
 195  */
 196 uintptr_t
 197 ld_sym_nodirect(Is_desc *isp, Ifl_desc *ifl, Ofl_desc *ofl)
 198 {
 199         Shdr            *sifshdr, *symshdr;
 200         Syminfo         *sifdata;
 201         Sym             *symdata;
 202         char            *strdata;
 203         ulong_t         cnt, _cnt;
 204 
 205         /*
 206          * Get the syminfo data, and determine the number of entries.
 207          */
 208         sifshdr = isp->is_shdr;
 209         sifdata = (Syminfo *)isp->is_indata->d_buf;
 210         cnt =  sifshdr->sh_size / sifshdr->sh_entsize;
 211 
 212         /*
 213          * Get the associated symbol table.
 214          */
 215         if ((sifshdr->sh_link == 0) || (sifshdr->sh_link >= ifl->ifl_shnum)) {
 216                 /*
 217                  * Broken input file
 218                  */
 219                 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_FIL_INVSHINFO),
 220                     ifl->ifl_name, isp->is_name, EC_XWORD(sifshdr->sh_link));
 221                 return (0);
 222         }
 223         symshdr = ifl->ifl_isdesc[sifshdr->sh_link]->is_shdr;
 224         symdata = ifl->ifl_isdesc[sifshdr->sh_link]->is_indata->d_buf;
 225 
 226         /*
 227          * Get the string table associated with the symbol table.
 228          */
 229         strdata = ifl->ifl_isdesc[symshdr->sh_link]->is_indata->d_buf;
 230 
 231         /*
 232          * Traverse the syminfo data for symbols that can't be directly
 233          * bound to.
 234          */
 235         for (_cnt = 1, sifdata++; _cnt < cnt; _cnt++, sifdata++) {
 236                 Sym             *sym;
 237                 char            *str;
 238                 Sym_desc        *sdp;
 239 
 240                 if ((sifdata->si_flags & SYMINFO_FLG_NOEXTDIRECT) == 0)
 241                         continue;
 242 
 243                 sym = (Sym *)(symdata + _cnt);
 244                 str = (char *)(strdata + sym->st_name);
 245 
 246                 if ((sdp = ld_sym_find(str, SYM_NOHASH, NULL, ofl)) != NULL) {
 247                         if (ifl != sdp->sd_file)
 248                                 continue;
 249 
 250                         sdp->sd_flags &= ~FLG_SY_DIR;
 251                         sdp->sd_flags |= FLG_SY_NDIR;
 252                 }
 253         }
 254         return (0);
 255 }
 256 
 257 /*
 258  * If, during symbol processing, it is necessary to update a local symbols
 259  * contents before we have generated the symbol tables in the output image,
 260  * create a new symbol structure and copy the original symbol contents.  While
 261  * we are processing the input files, their local symbols are part of the
 262  * read-only mapped image.  Commonly, these symbols are copied to the new output
 263  * file image and then updated to reflect their new address and any change in
 264  * attributes.  However, sometimes during relocation counting, it is necessary
 265  * to adjust the symbols information.  This routine provides for the generation
 266  * of a new symbol image so that this update can be performed.
 267  * All global symbols are copied to an internal symbol table to improve locality
 268  * of reference and hence performance, and thus this copying is not necessary.
 269  */
 270 uintptr_t
 271 ld_sym_copy(Sym_desc *sdp)
 272 {
 273         Sym     *nsym;
 274 
 275         if (sdp->sd_flags & FLG_SY_CLEAN) {
 276                 if ((nsym = libld_malloc(sizeof (Sym))) == NULL)
 277                         return (S_ERROR);
 278                 *nsym = *(sdp->sd_sym);
 279                 sdp->sd_sym = nsym;
 280                 sdp->sd_flags &= ~FLG_SY_CLEAN;
 281         }
 282         return (1);
 283 }
 284 
 285 /*
 286  * Finds a given name in the link editors internal symbol table.  If no
 287  * hash value is specified it is calculated.  A pointer to the located
 288  * Sym_desc entry is returned, or NULL if the symbol is not found.
 289  */
 290 Sym_desc *
 291 ld_sym_find(const char *name, Word hash, avl_index_t *where, Ofl_desc *ofl)
 292 {
 293         Sym_avlnode     qsav, *sav;
 294 
 295         if (hash == SYM_NOHASH)
 296                 /* LINTED */
 297                 hash = (Word)elf_hash((const char *)name);
 298         qsav.sav_hash = hash;
 299         qsav.sav_name = name;
 300 
 301         /*
 302          * Perform search for symbol in AVL tree.  Note that the 'where' field
 303          * is passed in from the caller.  If a 'where' is present, it can be
 304          * used in subsequent 'ld_sym_enter()' calls if required.
 305          */
 306         sav = avl_find(&ofl->ofl_symavl, &qsav, where);
 307 
 308         /*
 309          * If symbol was not found in the avl tree, return null to show that.
 310          */
 311         if (sav == NULL)
 312                 return (NULL);
 313 
 314         /*
 315          * Return symbol found.
 316          */
 317         return (sav->sav_sdp);
 318 }
 319 
 320 /*
 321  * Enter a new symbol into the link editors internal symbol table.
 322  * If the symbol is from an input file, information regarding the input file
 323  * and input section is also recorded.  Otherwise (file == NULL) the symbol
 324  * has been internally generated (ie. _etext, _edata, etc.).
 325  */
 326 Sym_desc *
 327 ld_sym_enter(const char *name, Sym *osym, Word hash, Ifl_desc *ifl,
 328     Ofl_desc *ofl, Word ndx, Word shndx, sd_flag_t sdflags, avl_index_t *where)
 329 {
 330         Sym_desc        *sdp;
 331         Sym_aux         *sap;
 332         Sym_avlnode     *savl;
 333         char            *_name;
 334         Sym             *nsym;
 335         Half            etype;
 336         uchar_t         vis;
 337         avl_index_t     _where;
 338 
 339         /*
 340          * Establish the file type.
 341          */
 342         if (ifl)
 343                 etype = ifl->ifl_ehdr->e_type;
 344         else
 345                 etype = ET_NONE;
 346 
 347         ofl->ofl_entercnt++;
 348 
 349         /*
 350          * Allocate a Sym Descriptor, Auxiliary Descriptor, and a Sym AVLNode -
 351          * contiguously.
 352          */
 353         if ((savl = libld_calloc(S_DROUND(sizeof (Sym_avlnode)) +
 354             S_DROUND(sizeof (Sym_desc)) +
 355             S_DROUND(sizeof (Sym_aux)), 1)) == NULL)
 356                 return ((Sym_desc *)S_ERROR);
 357         sdp = (Sym_desc *)((uintptr_t)savl +
 358             S_DROUND(sizeof (Sym_avlnode)));
 359         sap = (Sym_aux *)((uintptr_t)sdp +
 360             S_DROUND(sizeof (Sym_desc)));
 361 
 362         savl->sav_sdp = sdp;
 363         sdp->sd_file = ifl;
 364         sdp->sd_aux = sap;
 365         savl->sav_hash = sap->sa_hash = hash;
 366 
 367         /*
 368          * Copy the symbol table entry from the input file into the internal
 369          * entry and have the symbol descriptor use it.
 370          */
 371         sdp->sd_sym = nsym = &sap->sa_sym;
 372         *nsym = *osym;
 373         sdp->sd_shndx = shndx;
 374         sdp->sd_flags |= sdflags;
 375 
 376         if ((_name = libld_malloc(strlen(name) + 1)) == NULL)
 377                 return ((Sym_desc *)S_ERROR);
 378         savl->sav_name = sdp->sd_name = (const char *)strcpy(_name, name);
 379 
 380         /*
 381          * Enter Symbol in AVL tree.
 382          */
 383         if (where == 0) {
 384                 /* LINTED */
 385                 Sym_avlnode     *_savl;
 386                 /*
 387                  * If a previous ld_sym_find() hasn't initialized 'where' do it
 388                  * now.
 389                  */
 390                 where = &_where;
 391                 _savl = avl_find(&ofl->ofl_symavl, savl, where);
 392                 assert(_savl == NULL);
 393         }
 394         avl_insert(&ofl->ofl_symavl, savl, *where);
 395 
 396         /*
 397          * Record the section index.  This is possible because the
 398          * `ifl_isdesc' table is filled before we start symbol processing.
 399          */
 400         if ((sdflags & FLG_SY_SPECSEC) || (nsym->st_shndx == SHN_UNDEF))
 401                 sdp->sd_isc = NULL;
 402         else {
 403                 sdp->sd_isc = ifl->ifl_isdesc[shndx];
 404 
 405                 /*
 406                  * If this symbol is from a relocatable object, make sure that
 407                  * it is still associated with a section.  For example, an
 408                  * unknown section type (SHT_NULL) would have been rejected on
 409                  * input with a warning.  Here, we make the use of the symbol
 410                  * fatal.  A symbol descriptor is still returned, so that the
 411                  * caller can continue processing all symbols, and hence flush
 412                  * out as many error conditions as possible.
 413                  */
 414                 if ((etype == ET_REL) && (sdp->sd_isc == NULL)) {
 415                         ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_SYM_INVSEC),
 416                             name, ifl->ifl_name, EC_XWORD(shndx));
 417                         return (sdp);
 418                 }
 419         }
 420 
 421         /*
 422          * Mark any COMMON symbols as 'tentative'.
 423          */
 424         if (sdflags & FLG_SY_SPECSEC) {
 425                 if (nsym->st_shndx == SHN_COMMON)
 426                         sdp->sd_flags |= FLG_SY_TENTSYM;
 427 #if     defined(_ELF64)
 428                 else if ((ld_targ.t_m.m_mach == EM_AMD64) &&
 429                     (nsym->st_shndx == SHN_X86_64_LCOMMON))
 430                         sdp->sd_flags |= FLG_SY_TENTSYM;
 431 #endif
 432         }
 433 
 434         /*
 435          * Establish the symbols visibility and reference.
 436          */
 437         vis = ELF_ST_VISIBILITY(nsym->st_other);
 438 
 439         if ((etype == ET_NONE) || (etype == ET_REL)) {
 440                 switch (vis) {
 441                 case STV_DEFAULT:
 442                         sdp->sd_flags |= FLG_SY_DEFAULT;
 443                         break;
 444                 case STV_INTERNAL:
 445                 case STV_HIDDEN:
 446                         sdp->sd_flags |= FLG_SY_HIDDEN;
 447                         break;
 448                 case STV_PROTECTED:
 449                         sdp->sd_flags |= FLG_SY_PROTECT;
 450                         break;
 451                 case STV_EXPORTED:
 452                         sdp->sd_flags |= FLG_SY_EXPORT;
 453                         break;
 454                 case STV_SINGLETON:
 455                         sdp->sd_flags |= (FLG_SY_SINGLE | FLG_SY_NDIR);
 456                         ofl->ofl_flags1 |= (FLG_OF1_NDIRECT | FLG_OF1_NGLBDIR);
 457                         break;
 458                 case STV_ELIMINATE:
 459                         sdp->sd_flags |= (FLG_SY_HIDDEN | FLG_SY_ELIM);
 460                         break;
 461                 default:
 462                         assert(vis <= STV_ELIMINATE);
 463                 }
 464 
 465                 sdp->sd_ref = REF_REL_NEED;
 466 
 467                 /*
 468                  * Under -Bnodirect, all exported interfaces that have not
 469                  * explicitly been defined protected or directly bound to, are
 470                  * tagged to prevent direct binding.
 471                  */
 472                 if ((ofl->ofl_flags1 & FLG_OF1_ALNODIR) &&
 473                     ((sdp->sd_flags & (FLG_SY_PROTECT | FLG_SY_DIR)) == 0) &&
 474                     (nsym->st_shndx != SHN_UNDEF)) {
 475                         sdp->sd_flags |= FLG_SY_NDIR;
 476                 }
 477         } else {
 478                 sdp->sd_ref = REF_DYN_SEEN;
 479 
 480                 /*
 481                  * If this is a protected symbol, remember this.  Note, this
 482                  * state is different from the FLG_SY_PROTECT used to establish
 483                  * a symbol definitions visibility.  This state is used to warn
 484                  * against possible copy relocations against this referenced
 485                  * symbol.
 486                  */
 487                 if (vis == STV_PROTECTED)
 488                         sdp->sd_flags |= FLG_SY_PROT;
 489 
 490                 /*
 491                  * If this is a SINGLETON definition, then indicate the symbol
 492                  * can not be directly bound to, and retain the visibility.
 493                  * This visibility will be inherited by any references made to
 494                  * this symbol.
 495                  */
 496                 if ((vis == STV_SINGLETON) && (nsym->st_shndx != SHN_UNDEF))
 497                         sdp->sd_flags |= (FLG_SY_SINGLE | FLG_SY_NDIR);
 498 
 499                 /*
 500                  * If the new symbol is from a shared library and is associated
 501                  * with a SHT_NOBITS section then this symbol originated from a
 502                  * tentative symbol.
 503                  */
 504                 if (sdp->sd_isc &&
 505                     (sdp->sd_isc->is_shdr->sh_type == SHT_NOBITS))
 506                         sdp->sd_flags |= FLG_SY_TENTSYM;
 507         }
 508 
 509         /*
 510          * Reclassify any SHN_SUNW_IGNORE symbols to SHN_UNDEF so as to
 511          * simplify future processing.
 512          */
 513         if (nsym->st_shndx == SHN_SUNW_IGNORE) {
 514                 sdp->sd_shndx = shndx = SHN_UNDEF;
 515                 sdp->sd_flags |= (FLG_SY_REDUCED |
 516                     FLG_SY_HIDDEN | FLG_SY_IGNORE | FLG_SY_ELIM);
 517         }
 518 
 519         /*
 520          * If this is an undefined, or common symbol from a relocatable object
 521          * determine whether it is a global or weak reference (see build_osym(),
 522          * where REF_DYN_NEED definitions are returned back to undefines).
 523          */
 524         if ((etype == ET_REL) &&
 525             (ELF_ST_BIND(nsym->st_info) == STB_GLOBAL) &&
 526             ((nsym->st_shndx == SHN_UNDEF) || ((sdflags & FLG_SY_SPECSEC) &&
 527 #if     defined(_ELF64)
 528             ((nsym->st_shndx == SHN_COMMON) ||
 529             ((ld_targ.t_m.m_mach == EM_AMD64) &&
 530             (nsym->st_shndx == SHN_X86_64_LCOMMON))))))
 531 #else
 532         /* BEGIN CSTYLED */
 533             (nsym->st_shndx == SHN_COMMON))))
 534         /* END CSTYLED */
 535 #endif
 536                 sdp->sd_flags |= FLG_SY_GLOBREF;
 537 
 538         /*
 539          * Record the input filename on the referenced or defined files list
 540          * for possible later diagnostics.  The `sa_rfile' pointer contains the
 541          * name of the file that first referenced this symbol and is used to
 542          * generate undefined symbol diagnostics (refer to sym_undef_entry()).
 543          * Note that this entry can be overridden if a reference from a
 544          * relocatable object is found after a reference from a shared object
 545          * (refer to sym_override()).
 546          * The `sa_dfiles' list is used to maintain the list of files that
 547          * define the same symbol.  This list can be used for two reasons:
 548          *
 549          *  -   To save the first definition of a symbol that is not available
 550          *      for this link-edit.
 551          *
 552          *  -   To save all definitions of a symbol when the -m option is in
 553          *      effect.  This is optional as it is used to list multiple
 554          *      (interposed) definitions of a symbol (refer to ldmap_out()),
 555          *      and can be quite expensive.
 556          */
 557         if (nsym->st_shndx == SHN_UNDEF) {
 558                 sap->sa_rfile = ifl->ifl_name;
 559         } else {
 560                 if (sdp->sd_ref == REF_DYN_SEEN) {
 561                         /*
 562                          * A symbol is determined to be unavailable if it
 563                          * belongs to a version of a shared object that this
 564                          * user does not wish to use, or if it belongs to an
 565                          * implicit shared object.
 566                          */
 567                         if (ifl->ifl_vercnt) {
 568                                 Ver_index       *vip;
 569                                 Half            vndx = ifl->ifl_versym[ndx];
 570 
 571                                 sap->sa_dverndx = vndx;
 572                                 vip = &ifl->ifl_verndx[vndx];
 573                                 if (!(vip->vi_flags & FLG_VER_AVAIL)) {
 574                                         sdp->sd_flags |= FLG_SY_NOTAVAIL;
 575                                         sap->sa_vfile = ifl->ifl_name;
 576                                 }
 577                         }
 578                         if (!(ifl->ifl_flags & FLG_IF_NEEDED))
 579                                 sdp->sd_flags |= FLG_SY_NOTAVAIL;
 580 
 581                 } else if (etype == ET_REL) {
 582                         /*
 583                          * If this symbol has been obtained from a versioned
 584                          * input relocatable object then the new symbol must be
 585                          * promoted to the versioning of the output file.
 586                          */
 587                         if (ifl->ifl_versym)
 588                                 ld_vers_promote(sdp, ndx, ifl, ofl);
 589                 }
 590 
 591                 if ((ofl->ofl_flags & FLG_OF_GENMAP) &&
 592                     ((sdflags & FLG_SY_SPECSEC) == 0))
 593                         if (aplist_append(&sap->sa_dfiles, ifl->ifl_name,
 594                             AL_CNT_SDP_DFILES) == NULL)
 595                                 return ((Sym_desc *)S_ERROR);
 596         }
 597 
 598         /*
 599          * Provided we're not processing a mapfile, diagnose the entered symbol.
 600          * Mapfile processing requires the symbol to be updated with additional
 601          * information, therefore the diagnosing of the symbol is deferred until
 602          * later (see Dbg_map_symbol()).
 603          */
 604         if ((ifl == NULL) || ((ifl->ifl_flags & FLG_IF_MAPFILE) == 0))
 605                 DBG_CALL(Dbg_syms_entered(ofl, nsym, sdp));
 606 
 607         return (sdp);
 608 }
 609 
 610 /*
 611  * Add a special symbol to the symbol table.  Takes special symbol name with
 612  * and without underscores.  This routine is called, after all other symbol
 613  * resolution has completed, to generate a reserved absolute symbol (the
 614  * underscore version).  Special symbols are updated with the appropriate
 615  * values in update_osym().  If the user has already defined this symbol
 616  * issue a warning and leave the symbol as is.  If the non-underscore symbol
 617  * is referenced then turn it into a weak alias of the underscored symbol.
 618  *
 619  * The bits in sdflags_u are OR'd into the flags field of the symbol for the
 620  * underscored symbol.
 621  *
 622  * If this is a global symbol, and it hasn't explicitly been defined as being
 623  * directly bound to, indicate that it can't be directly bound to.
 624  * Historically, most special symbols only have meaning to the object in which
 625  * they exist, however, they've always been global.  To ensure compatibility
 626  * with any unexpected use presently in effect, ensure these symbols don't get
 627  * directly bound to.  Note, that establishing this state here isn't sufficient
 628  * to create a syminfo table, only if a syminfo table is being created by some
 629  * other symbol directives will the nodirect binding be recorded.  This ensures
 630  * we don't create syminfo sections for all objects we create, as this might add
 631  * unnecessary bloat to users who haven't explicitly requested extra symbol
 632  * information.
 633  */
 634 static uintptr_t
 635 sym_add_spec(const char *name, const char *uname, Word sdaux_id,
 636     sd_flag_t sdflags_u, sd_flag_t sdflags, Ofl_desc *ofl)
 637 {
 638         Sym_desc        *sdp;
 639         Sym_desc        *usdp;
 640         Sym             *sym;
 641         Word            hash;
 642         avl_index_t     where;
 643 
 644         /* LINTED */
 645         hash = (Word)elf_hash(uname);
 646         if (usdp = ld_sym_find(uname, hash, &where, ofl)) {
 647                 /*
 648                  * If the underscore symbol exists and is undefined, or was
 649                  * defined in a shared library, convert it to a local symbol.
 650                  * Otherwise leave it as is and warn the user.
 651                  */
 652                 if ((usdp->sd_shndx == SHN_UNDEF) ||
 653                     (usdp->sd_ref != REF_REL_NEED)) {
 654                         usdp->sd_ref = REF_REL_NEED;
 655                         usdp->sd_shndx = usdp->sd_sym->st_shndx = SHN_ABS;
 656                         usdp->sd_flags |= FLG_SY_SPECSEC | sdflags_u;
 657                         usdp->sd_sym->st_info =
 658                             ELF_ST_INFO(STB_GLOBAL, STT_OBJECT);
 659                         usdp->sd_isc = NULL;
 660                         usdp->sd_sym->st_size = 0;
 661                         usdp->sd_sym->st_value = 0;
 662                         /* LINTED */
 663                         usdp->sd_aux->sa_symspec = (Half)sdaux_id;
 664 
 665                         /*
 666                          * If a user hasn't specifically indicated that the
 667                          * scope of this symbol be made local, then leave it
 668                          * as global (ie. prevent automatic scoping).  The GOT
 669                          * should be defined protected, whereas all other
 670                          * special symbols are tagged as no-direct.
 671                          */
 672                         if (!SYM_IS_HIDDEN(usdp) &&
 673                             (sdflags & FLG_SY_DEFAULT)) {
 674                                 usdp->sd_aux->sa_overndx = VER_NDX_GLOBAL;
 675                                 if (sdaux_id == SDAUX_ID_GOT) {
 676                                         usdp->sd_flags &= ~FLG_SY_NDIR;
 677                                         usdp->sd_flags |= FLG_SY_PROTECT;
 678                                         usdp->sd_sym->st_other = STV_PROTECTED;
 679                                 } else if (
 680                                     ((usdp->sd_flags & FLG_SY_DIR) == 0) &&
 681                                     ((ofl->ofl_flags & FLG_OF_SYMBOLIC) == 0)) {
 682                                         usdp->sd_flags |= FLG_SY_NDIR;
 683                                 }
 684                         }
 685                         usdp->sd_flags |= sdflags;
 686 
 687                         /*
 688                          * If the reference originated from a mapfile ensure
 689                          * we mark the symbol as used.
 690                          */
 691                         if (usdp->sd_flags & FLG_SY_MAPREF)
 692                                 usdp->sd_flags |= FLG_SY_MAPUSED;
 693 
 694                         DBG_CALL(Dbg_syms_updated(ofl, usdp, uname));
 695                 } else
 696                         ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_RESERVE),
 697                             uname, usdp->sd_file->ifl_name);
 698         } else {
 699                 /*
 700                  * If the symbol does not exist create it.
 701                  */
 702                 if ((sym = libld_calloc(sizeof (Sym), 1)) == NULL)
 703                         return (S_ERROR);
 704                 sym->st_shndx = SHN_ABS;
 705                 sym->st_info = ELF_ST_INFO(STB_GLOBAL, STT_OBJECT);
 706                 sym->st_size = 0;
 707                 sym->st_value = 0;
 708                 DBG_CALL(Dbg_syms_created(ofl->ofl_lml, uname));
 709                 if ((usdp = ld_sym_enter(uname, sym, hash, (Ifl_desc *)NULL,
 710                     ofl, 0, SHN_ABS, (FLG_SY_SPECSEC | sdflags_u), &where)) ==
 711                     (Sym_desc *)S_ERROR)
 712                         return (S_ERROR);
 713                 usdp->sd_ref = REF_REL_NEED;
 714                 /* LINTED */
 715                 usdp->sd_aux->sa_symspec = (Half)sdaux_id;
 716 
 717                 usdp->sd_aux->sa_overndx = VER_NDX_GLOBAL;
 718 
 719                 if (sdaux_id == SDAUX_ID_GOT) {
 720                         usdp->sd_flags |= FLG_SY_PROTECT;
 721                         usdp->sd_sym->st_other = STV_PROTECTED;
 722                 } else if ((sdflags & FLG_SY_DEFAULT) &&
 723                     ((ofl->ofl_flags & FLG_OF_SYMBOLIC) == 0)) {
 724                         usdp->sd_flags |= FLG_SY_NDIR;
 725                 }
 726                 usdp->sd_flags |= sdflags;
 727         }
 728 
 729         if (name && (sdp = ld_sym_find(name, SYM_NOHASH, NULL, ofl)) &&
 730             (sdp->sd_sym->st_shndx == SHN_UNDEF)) {
 731                 uchar_t bind;
 732 
 733                 /*
 734                  * If the non-underscore symbol exists and is undefined
 735                  * convert it to be a local.  If the underscore has
 736                  * sa_symspec set (ie. it was created above) then simulate this
 737                  * as a weak alias.
 738                  */
 739                 sdp->sd_ref = REF_REL_NEED;
 740                 sdp->sd_shndx = sdp->sd_sym->st_shndx = SHN_ABS;
 741                 sdp->sd_flags |= FLG_SY_SPECSEC;
 742                 sdp->sd_isc = NULL;
 743                 sdp->sd_sym->st_size = 0;
 744                 sdp->sd_sym->st_value = 0;
 745                 /* LINTED */
 746                 sdp->sd_aux->sa_symspec = (Half)sdaux_id;
 747                 if (usdp->sd_aux->sa_symspec) {
 748                         usdp->sd_aux->sa_linkndx = 0;
 749                         sdp->sd_aux->sa_linkndx = 0;
 750                         bind = STB_WEAK;
 751                 } else
 752                         bind = STB_GLOBAL;
 753                 sdp->sd_sym->st_info = ELF_ST_INFO(bind, STT_OBJECT);
 754 
 755                 /*
 756                  * If a user hasn't specifically indicated the scope of this
 757                  * symbol be made local then leave it as global (ie. prevent
 758                  * automatic scoping).  The GOT should be defined protected,
 759                  * whereas all other special symbols are tagged as no-direct.
 760                  */
 761                 if (!SYM_IS_HIDDEN(sdp) &&
 762                     (sdflags & FLG_SY_DEFAULT)) {
 763                         sdp->sd_aux->sa_overndx = VER_NDX_GLOBAL;
 764                         if (sdaux_id == SDAUX_ID_GOT) {
 765                                 sdp->sd_flags &= ~FLG_SY_NDIR;
 766                                 sdp->sd_flags |= FLG_SY_PROTECT;
 767                                 sdp->sd_sym->st_other = STV_PROTECTED;
 768                         } else if (((sdp->sd_flags & FLG_SY_DIR) == 0) &&
 769                             ((ofl->ofl_flags & FLG_OF_SYMBOLIC) == 0)) {
 770                                 sdp->sd_flags |= FLG_SY_NDIR;
 771                         }
 772                 }
 773                 sdp->sd_flags |= sdflags;
 774 
 775                 /*
 776                  * If the reference originated from a mapfile ensure
 777                  * we mark the symbol as used.
 778                  */
 779                 if (sdp->sd_flags & FLG_SY_MAPREF)
 780                         sdp->sd_flags |= FLG_SY_MAPUSED;
 781 
 782                 DBG_CALL(Dbg_syms_updated(ofl, sdp, name));
 783         }
 784         return (1);
 785 }
 786 
 787 
 788 /*
 789  * Undefined symbols can fall into one of four types:
 790  *
 791  *  -   the symbol is really undefined (SHN_UNDEF).
 792  *
 793  *  -   versioning has been enabled, however this symbol has not been assigned
 794  *      to one of the defined versions.
 795  *
 796  *  -   the symbol has been defined by an implicitly supplied library, ie. one
 797  *      which was encounted because it was NEEDED by another library, rather
 798  *      than from a command line supplied library which would become the only
 799  *      dependency of the output file being produced.
 800  *
 801  *  -   the symbol has been defined by a version of a shared object that is
 802  *      not permitted for this link-edit.
 803  *
 804  * In all cases the file who made the first reference to this symbol will have
 805  * been recorded via the `sa_rfile' pointer.
 806  */
 807 typedef enum {
 808         UNDEF,          NOVERSION,      IMPLICIT,       NOTAVAIL,
 809         BNDLOCAL
 810 } Type;
 811 
 812 static const Msg format[] = {
 813         MSG_SYM_UND_UNDEF,              /* MSG_INTL(MSG_SYM_UND_UNDEF) */
 814         MSG_SYM_UND_NOVER,              /* MSG_INTL(MSG_SYM_UND_NOVER) */
 815         MSG_SYM_UND_IMPL,               /* MSG_INTL(MSG_SYM_UND_IMPL) */
 816         MSG_SYM_UND_NOTA,               /* MSG_INTL(MSG_SYM_UND_NOTA) */
 817         MSG_SYM_UND_BNDLOCAL            /* MSG_INTL(MSG_SYM_UND_BNDLOCAL) */
 818 };
 819 
 820 /*
 821  * Issue an undefined symbol message for the given symbol.
 822  *
 823  * entry:
 824  *      ofl - Output descriptor
 825  *      sdp - Undefined symbol to report
 826  *      type - Type of undefined symbol
 827  *      ofl_flag - One of 0, FLG_OF_FATAL, or FLG_OF_WARN.
 828  *      undef_state - Address of variable to be initialized to 0
 829  *              before the first call to sym_undef_entry, and passed
 830  *              to each subsequent call. A non-zero value for *undef_state
 831  *              indicates that this is not the first call in the series.
 832  *
 833  * exit:
 834  *      If *undef_state is 0, a title is issued.
 835  *
 836  *      A message for the undefined symbol is issued.
 837  *
 838  *      If ofl_flag is non-zero, its value is OR'd into *undef_state. Otherwise,
 839  *      all bits other than FLG_OF_FATAL and FLG_OF_WARN are set, in order to
 840  *      provide *undef_state with a non-zero value. These other bits have
 841  *      no meaning beyond that, and serve to ensure that *undef_state is
 842  *      non-zero if sym_undef_entry() has been called.
 843  */
 844 static void
 845 sym_undef_entry(Ofl_desc *ofl, Sym_desc *sdp, Type type, ofl_flag_t ofl_flag,
 846     ofl_flag_t *undef_state)
 847 {
 848         const char      *name1, *name2, *name3;
 849         Ifl_desc        *ifl = sdp->sd_file;
 850         Sym_aux         *sap = sdp->sd_aux;
 851 
 852         if (*undef_state == 0)
 853                 ld_eprintf(ofl, ERR_NONE, MSG_INTL(MSG_SYM_FMT_UNDEF),
 854                     MSG_INTL(MSG_SYM_UNDEF_ITM_11),
 855                     MSG_INTL(MSG_SYM_UNDEF_ITM_21),
 856                     MSG_INTL(MSG_SYM_UNDEF_ITM_12),
 857                     MSG_INTL(MSG_SYM_UNDEF_ITM_22));
 858 
 859         ofl->ofl_flags |= ofl_flag;
 860         *undef_state |= ofl_flag ? ofl_flag : ~(FLG_OF_FATAL | FLG_OF_WARN);
 861 
 862         switch (type) {
 863         case UNDEF:
 864         case BNDLOCAL:
 865                 name1 = sap->sa_rfile;
 866                 break;
 867         case NOVERSION:
 868                 name1 = ifl->ifl_name;
 869                 break;
 870         case IMPLICIT:
 871                 name1 = sap->sa_rfile;
 872                 name2 = ifl->ifl_name;
 873                 break;
 874         case NOTAVAIL:
 875                 name1 = sap->sa_rfile;
 876                 name2 = sap->sa_vfile;
 877                 name3 = ifl->ifl_verndx[sap->sa_dverndx].vi_name;
 878                 break;
 879         default:
 880                 return;
 881         }
 882 
 883         ld_eprintf(ofl, ERR_NONE, MSG_INTL(format[type]),
 884             demangle(sdp->sd_name), name1, name2, name3);
 885 }
 886 
 887 /*
 888  * At this point all symbol input processing has been completed, therefore
 889  * complete the symbol table entries by generating any necessary internal
 890  * symbols.
 891  */
 892 uintptr_t
 893 ld_sym_spec(Ofl_desc *ofl)
 894 {
 895         Sym_desc        *sdp;
 896 
 897         if (ofl->ofl_flags & FLG_OF_RELOBJ)
 898                 return (1);
 899 
 900         DBG_CALL(Dbg_syms_spec_title(ofl->ofl_lml));
 901 
 902         if (sym_add_spec(MSG_ORIG(MSG_SYM_ETEXT), MSG_ORIG(MSG_SYM_ETEXT_U),
 903             SDAUX_ID_ETEXT, 0, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
 904             ofl) == S_ERROR)
 905                 return (S_ERROR);
 906         if (sym_add_spec(MSG_ORIG(MSG_SYM_EDATA), MSG_ORIG(MSG_SYM_EDATA_U),
 907             SDAUX_ID_EDATA, 0, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
 908             ofl) == S_ERROR)
 909                 return (S_ERROR);
 910         if (sym_add_spec(MSG_ORIG(MSG_SYM_END), MSG_ORIG(MSG_SYM_END_U),
 911             SDAUX_ID_END, FLG_SY_DYNSORT, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
 912             ofl) == S_ERROR)
 913                 return (S_ERROR);
 914         if (sym_add_spec(MSG_ORIG(MSG_SYM_L_END), MSG_ORIG(MSG_SYM_L_END_U),
 915             SDAUX_ID_END, 0, FLG_SY_HIDDEN, ofl) == S_ERROR)
 916                 return (S_ERROR);
 917         if (sym_add_spec(MSG_ORIG(MSG_SYM_L_START), MSG_ORIG(MSG_SYM_L_START_U),
 918             SDAUX_ID_START, 0, FLG_SY_HIDDEN, ofl) == S_ERROR)
 919                 return (S_ERROR);
 920 
 921         /*
 922          * Historically we've always produced a _DYNAMIC symbol, even for
 923          * static executables (in which case its value will be 0).
 924          */
 925         if (sym_add_spec(MSG_ORIG(MSG_SYM_DYNAMIC), MSG_ORIG(MSG_SYM_DYNAMIC_U),
 926             SDAUX_ID_DYN, FLG_SY_DYNSORT, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
 927             ofl) == S_ERROR)
 928                 return (S_ERROR);
 929 
 930         if (OFL_ALLOW_DYNSYM(ofl))
 931                 if (sym_add_spec(MSG_ORIG(MSG_SYM_PLKTBL),
 932                     MSG_ORIG(MSG_SYM_PLKTBL_U), SDAUX_ID_PLT,
 933                     FLG_SY_DYNSORT, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
 934                     ofl) == S_ERROR)
 935                         return (S_ERROR);
 936 
 937         /*
 938          * A GOT reference will be accompanied by the associated GOT symbol.
 939          * Make sure it gets assigned the appropriate special attributes.
 940          */
 941         if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL_U),
 942             SYM_NOHASH, NULL, ofl)) != NULL) && (sdp->sd_ref != REF_DYN_SEEN)) {
 943                 if (sym_add_spec(MSG_ORIG(MSG_SYM_GOFTBL),
 944                     MSG_ORIG(MSG_SYM_GOFTBL_U), SDAUX_ID_GOT, FLG_SY_DYNSORT,
 945                     (FLG_SY_DEFAULT | FLG_SY_EXPDEF), ofl) == S_ERROR)
 946                         return (S_ERROR);
 947         }
 948 
 949         return (1);
 950 }
 951 
 952 /*
 953  * Determine a potential capability symbol's visibility.
 954  *
 955  * The -z symbolcap option transforms an object capabilities relocatable object
 956  * into a symbol capabilities relocatable object.  Any global function symbols,
 957  * or initialized global data symbols are candidates for transforming into local
 958  * symbol capabilities definitions.  However, if a user indicates that a symbol
 959  * should be demoted to local using a mapfile, then there is no need to
 960  * transform the associated global symbol.
 961  *
 962  * Normally, a symbol's visibility is determined after the symbol resolution
 963  * process, after all symbol state has been gathered and resolved.  However,
 964  * for -z symbolcap, this determination is too late.  When a global symbol is
 965  * read from an input file we need to determine it's visibility so as to decide
 966  * whether to create a local or not.
 967  *
 968  * If a user has explicitly defined this symbol as having local scope within a
 969  * mapfile, then a symbol of the same name already exists.  However, explicit
 970  * local definitions are uncommon, as most mapfiles define the global symbol
 971  * requirements together with an auto-reduction directive '*'.  If this state
 972  * has been defined, then we must make sure that the new symbol isn't a type
 973  * that can not be demoted to local.
 974  */
 975 static int
 976 sym_cap_vis(const char *name, Word hash, Sym *sym, Ofl_desc *ofl)
 977 {
 978         Sym_desc        *sdp;
 979         uchar_t         vis;
 980         avl_index_t     where;
 981         sd_flag_t       sdflags = 0;
 982 
 983         /*
 984          * Determine the visibility of the new symbol.
 985          */
 986         vis = ELF_ST_VISIBILITY(sym->st_other);
 987         switch (vis) {
 988         case STV_EXPORTED:
 989                 sdflags |= FLG_SY_EXPORT;
 990                 break;
 991         case STV_SINGLETON:
 992                 sdflags |= FLG_SY_SINGLE;
 993                 break;
 994         }
 995 
 996         /*
 997          * Determine whether a symbol definition already exists, and if so
 998          * obtain the visibility.
 999          */
1000         if ((sdp = ld_sym_find(name, hash, &where, ofl)) != NULL)
1001                 sdflags |= sdp->sd_flags;
1002 
1003         /*
1004          * Determine whether the symbol flags indicate this symbol should be
1005          * hidden.
1006          */
1007         if ((ofl->ofl_flags & (FLG_OF_AUTOLCL | FLG_OF_AUTOELM)) &&
1008             ((sdflags & MSK_SY_NOAUTO) == 0))
1009                 sdflags |= FLG_SY_HIDDEN;
1010 
1011         return ((sdflags & FLG_SY_HIDDEN) == 0);
1012 }
1013 
1014 /*
1015  * This routine checks to see if a symbols visibility needs to be reduced to
1016  * either SYMBOLIC or LOCAL.  This routine can be called from either
1017  * reloc_init() or sym_validate().
1018  */
1019 void
1020 ld_sym_adjust_vis(Sym_desc *sdp, Ofl_desc *ofl)
1021 {
1022         ofl_flag_t      oflags = ofl->ofl_flags;
1023         Sym             *sym = sdp->sd_sym;
1024 
1025         if ((sdp->sd_ref == REF_REL_NEED) &&
1026             (sdp->sd_sym->st_shndx != SHN_UNDEF)) {
1027                 /*
1028                  * If auto-reduction/elimination is enabled, reduce any
1029                  * non-versioned, and non-local capabilities global symbols.
1030                  * A symbol is a candidate for auto-reduction/elimination if:
1031                  *
1032                  *  -   the symbol wasn't explicitly defined within a mapfile
1033                  *      (in which case all the necessary state has been applied
1034                  *      to the symbol), or
1035                  *  -   the symbol isn't one of the family of reserved
1036                  *      special symbols (ie. _end, _etext, etc.), or
1037                  *  -   the symbol isn't a SINGLETON, or
1038                  *  -   the symbol wasn't explicitly defined within a version
1039                  *      definition associated with an input relocatable object.
1040                  *
1041                  * Indicate that the symbol has been reduced as it may be
1042                  * necessary to print these symbols later.
1043                  */
1044                 if ((oflags & (FLG_OF_AUTOLCL | FLG_OF_AUTOELM)) &&
1045                     ((sdp->sd_flags & MSK_SY_NOAUTO) == 0)) {
1046                         if ((sdp->sd_flags & FLG_SY_HIDDEN) == 0) {
1047                                 sdp->sd_flags |=
1048                                     (FLG_SY_REDUCED | FLG_SY_HIDDEN);
1049                         }
1050 
1051                         if (oflags & (FLG_OF_REDLSYM | FLG_OF_AUTOELM)) {
1052                                 sdp->sd_flags |= FLG_SY_ELIM;
1053                                 sym->st_other = STV_ELIMINATE |
1054                                     (sym->st_other & ~MSK_SYM_VISIBILITY);
1055                         } else if (ELF_ST_VISIBILITY(sym->st_other) !=
1056                             STV_INTERNAL)
1057                                 sym->st_other = STV_HIDDEN |
1058                                     (sym->st_other & ~MSK_SYM_VISIBILITY);
1059                 }
1060 
1061                 /*
1062                  * If -Bsymbolic is in effect, and the symbol hasn't explicitly
1063                  * been defined nodirect (via a mapfile), then bind the global
1064                  * symbol symbolically and assign the STV_PROTECTED visibility
1065                  * attribute.
1066                  */
1067                 if ((oflags & FLG_OF_SYMBOLIC) &&
1068                     ((sdp->sd_flags & (FLG_SY_HIDDEN | FLG_SY_NDIR)) == 0)) {
1069                         sdp->sd_flags |= FLG_SY_PROTECT;
1070                         if (ELF_ST_VISIBILITY(sym->st_other) == STV_DEFAULT)
1071                                 sym->st_other = STV_PROTECTED |
1072                                     (sym->st_other & ~MSK_SYM_VISIBILITY);
1073                 }
1074         }
1075 
1076         /*
1077          * Indicate that this symbol has had it's visibility checked so that
1078          * we don't need to do this investigation again.
1079          */
1080         sdp->sd_flags |= FLG_SY_VISIBLE;
1081 }
1082 
1083 /*
1084  * Make sure a symbol definition is local to the object being built.
1085  */
1086 inline static int
1087 ensure_sym_local(Ofl_desc *ofl, Sym_desc *sdp, const char *str)
1088 {
1089         if (sdp->sd_sym->st_shndx == SHN_UNDEF) {
1090                 if (str) {
1091                         ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_SYM_UNDEF),
1092                             str, demangle((char *)sdp->sd_name));
1093                 }
1094                 return (1);
1095         }
1096         if (sdp->sd_ref != REF_REL_NEED) {
1097                 if (str) {
1098                         ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_SYM_EXTERN),
1099                             str, demangle((char *)sdp->sd_name),
1100                             sdp->sd_file->ifl_name);
1101                 }
1102                 return (1);
1103         }
1104 
1105         sdp->sd_flags |= FLG_SY_UPREQD;
1106         if (sdp->sd_isc) {
1107                 sdp->sd_isc->is_flags |= FLG_IS_SECTREF;
1108                 sdp->sd_isc->is_file->ifl_flags |= FLG_IF_FILEREF;
1109         }
1110         return (0);
1111 }
1112 
1113 /*
1114  * Make sure all the symbol definitions required for initarray, finiarray, or
1115  * preinitarray's are local to the object being built.
1116  */
1117 static int
1118 ensure_array_local(Ofl_desc *ofl, APlist *apl, const char *str)
1119 {
1120         Aliste          idx;
1121         Sym_desc        *sdp;
1122         int             ret = 0;
1123 
1124         for (APLIST_TRAVERSE(apl, idx, sdp))
1125                 ret += ensure_sym_local(ofl, sdp, str);
1126 
1127         return (ret);
1128 }
1129 
1130 /*
1131  * After all symbol table input processing has been finished, and all relocation
1132  * counting has been carried out (ie. no more symbols will be read, generated,
1133  * or modified), validate and count the relevant entries:
1134  *
1135  *  -   check and print any undefined symbols remaining.  Note that if a symbol
1136  *      has been defined by virtue of the inclusion of  an implicit shared
1137  *      library, it is still classed as undefined.
1138  *
1139  *  -   count the number of global needed symbols together with the size of
1140  *      their associated name strings (if scoping has been indicated these
1141  *      symbols may be reduced to locals).
1142  *
1143  *  -   establish the size and alignment requirements for the global .bss
1144  *      section (the alignment of this section is based on the  first symbol
1145  *      that it will contain).
1146  */
1147 uintptr_t
1148 ld_sym_validate(Ofl_desc *ofl)
1149 {
1150         Sym_avlnode     *sav;
1151         Sym_desc        *sdp;
1152         Sym             *sym;
1153         ofl_flag_t      oflags = ofl->ofl_flags;
1154         ofl_flag_t      undef = 0, needed = 0, verdesc = 0;
1155         Xword           bssalign = 0, tlsalign = 0;
1156         Boolean         need_bss, need_tlsbss;
1157         Xword           bsssize = 0, tlssize = 0;
1158 #if     defined(_ELF64)
1159         Xword           lbssalign = 0, lbsssize = 0;
1160         Boolean         need_lbss;
1161 #endif
1162         int             ret, allow_ldynsym;
1163         uchar_t         type;
1164         ofl_flag_t      undef_state = 0;
1165 
1166         DBG_CALL(Dbg_basic_validate(ofl->ofl_lml));
1167 
1168         /*
1169          * The need_XXX booleans are used to determine whether we need to
1170          * create each type of bss section. We used to create these sections
1171          * if the sum of the required sizes for each type were non-zero.
1172          * However, it is possible for a compiler to generate COMMON variables
1173          * of zero-length and this tricks that logic --- even zero-length
1174          * symbols need an output section.
1175          */
1176         need_bss = need_tlsbss = FALSE;
1177 #if     defined(_ELF64)
1178         need_lbss = FALSE;
1179 #endif
1180 
1181         /*
1182          * Determine how undefined symbols are handled:
1183          *
1184          * fatal:
1185          *      If this link-edit calls for no undefined symbols to remain
1186          *      (this is the default case when generating an executable but
1187          *      can be enforced for any object using -z defs), a fatal error
1188          *      condition will be indicated.
1189          *
1190          * warning:
1191          *      If we're creating a shared object, and either the -Bsymbolic
1192          *      flag is set, or the user has turned on the -z guidance feature,
1193          *      then a non-fatal warning is issued for each symbol.
1194          *
1195          * ignore:
1196          *      In all other cases, undefined symbols are quietly allowed.
1197          */
1198         if (oflags & FLG_OF_NOUNDEF) {
1199                 undef = FLG_OF_FATAL;
1200         } else if (oflags & FLG_OF_SHAROBJ) {
1201                 if ((oflags & FLG_OF_SYMBOLIC) ||
1202                     OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS))
1203                         undef = FLG_OF_WARN;
1204         }
1205 
1206         /*
1207          * If the symbol is referenced from an implicitly included shared object
1208          * (ie. it's not on the NEEDED list) then the symbol is also classified
1209          * as undefined and a fatal error condition will be indicated.
1210          */
1211         if ((oflags & FLG_OF_NOUNDEF) || !(oflags & FLG_OF_SHAROBJ))
1212                 needed = FLG_OF_FATAL;
1213         else if ((oflags & FLG_OF_SHAROBJ) &&
1214             OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS))
1215                 needed = FLG_OF_WARN;
1216 
1217         /*
1218          * If the output image is being versioned, then all symbol definitions
1219          * must be associated with a version.  Any symbol that isn't associated
1220          * with a version is classified as undefined, and a fatal error
1221          * condition is indicated.
1222          */
1223         if ((oflags & FLG_OF_VERDEF) && (ofl->ofl_vercnt > VER_NDX_GLOBAL))
1224                 verdesc = FLG_OF_FATAL;
1225 
1226         allow_ldynsym = OFL_ALLOW_LDYNSYM(ofl);
1227 
1228         if (allow_ldynsym) {
1229                 /*
1230                  * Normally, we disallow symbols with 0 size from appearing
1231                  * in a dyn[sym|tls]sort section. However, there are some
1232                  * symbols that serve special purposes that we want to exempt
1233                  * from this rule. Look them up, and set their
1234                  * FLG_SY_DYNSORT flag.
1235                  */
1236                 static const char *special[] = {
1237                         MSG_ORIG(MSG_SYM_INIT_U),       /* _init */
1238                         MSG_ORIG(MSG_SYM_FINI_U),       /* _fini */
1239                         MSG_ORIG(MSG_SYM_START),        /* _start */
1240                         NULL
1241                 };
1242                 int i;
1243 
1244                 for (i = 0; special[i] != NULL; i++) {
1245                         if (((sdp = ld_sym_find(special[i],
1246                             SYM_NOHASH, NULL, ofl)) != NULL) &&
1247                             (sdp->sd_sym->st_size == 0)) {
1248                                 if (ld_sym_copy(sdp) == S_ERROR)
1249                                         return (S_ERROR);
1250                                 sdp->sd_flags |= FLG_SY_DYNSORT;
1251                         }
1252                 }
1253         }
1254 
1255         /*
1256          * Collect and validate the globals from the internal symbol table.
1257          */
1258         for (sav = avl_first(&ofl->ofl_symavl); sav;
1259             sav = AVL_NEXT(&ofl->ofl_symavl, sav)) {
1260                 Is_desc         *isp;
1261                 int             undeferr = 0;
1262                 uchar_t         vis;
1263 
1264                 sdp = sav->sav_sdp;
1265 
1266                 /*
1267                  * If undefined symbols are allowed, and we're not being
1268                  * asked to supply guidance, ignore any symbols that are
1269                  * not needed.
1270                  */
1271                 if (!(oflags & FLG_OF_NOUNDEF) &&
1272                     !OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS) &&
1273                     (sdp->sd_ref == REF_DYN_SEEN))
1274                         continue;
1275 
1276                 /*
1277                  * If the symbol originates from an external or parent mapfile
1278                  * reference and hasn't been matched to a reference from a
1279                  * relocatable object, ignore it.
1280                  */
1281                 if ((sdp->sd_flags & (FLG_SY_EXTERN | FLG_SY_PARENT)) &&
1282                     ((sdp->sd_flags & FLG_SY_MAPUSED) == 0)) {
1283                         sdp->sd_flags |= FLG_SY_INVALID;
1284                         continue;
1285                 }
1286 
1287                 sym = sdp->sd_sym;
1288                 type = ELF_ST_TYPE(sym->st_info);
1289 
1290                 /*
1291                  * Sanity check TLS.
1292                  */
1293                 if ((type == STT_TLS) && (sym->st_size != 0) &&
1294                     (sym->st_shndx != SHN_UNDEF) &&
1295                     (sym->st_shndx != SHN_COMMON)) {
1296                         Is_desc         *isp = sdp->sd_isc;
1297                         Ifl_desc        *ifl = sdp->sd_file;
1298 
1299                         if ((isp == NULL) || (isp->is_shdr == NULL) ||
1300                             ((isp->is_shdr->sh_flags & SHF_TLS) == 0)) {
1301                                 ld_eprintf(ofl, ERR_FATAL,
1302                                     MSG_INTL(MSG_SYM_TLS),
1303                                     demangle(sdp->sd_name), ifl->ifl_name);
1304                                 continue;
1305                         }
1306                 }
1307 
1308                 if ((sdp->sd_flags & FLG_SY_VISIBLE) == 0)
1309                         ld_sym_adjust_vis(sdp, ofl);
1310 
1311                 if ((sdp->sd_flags & FLG_SY_REDUCED) &&
1312                     (oflags & FLG_OF_PROCRED)) {
1313                         DBG_CALL(Dbg_syms_reduce(ofl, DBG_SYM_REDUCE_GLOBAL,
1314                             sdp, 0, 0));
1315                 }
1316 
1317                 /*
1318                  * Record any STV_SINGLETON existence.
1319                  */
1320                 if ((vis = ELF_ST_VISIBILITY(sym->st_other)) == STV_SINGLETON)
1321                         ofl->ofl_dtflags_1 |= DF_1_SINGLETON;
1322 
1323                 /*
1324                  * If building a shared object or executable, and this is a
1325                  * non-weak UNDEF symbol with reduced visibility (STV_*), then
1326                  * give a fatal error.
1327                  */
1328                 if (((oflags & FLG_OF_RELOBJ) == 0) &&
1329                     (sym->st_shndx == SHN_UNDEF) &&
1330                     (ELF_ST_BIND(sym->st_info) != STB_WEAK)) {
1331                         if (vis && (vis != STV_SINGLETON)) {
1332                                 sym_undef_entry(ofl, sdp, BNDLOCAL,
1333                                     FLG_OF_FATAL, &undef_state);
1334                                 continue;
1335                         }
1336                 }
1337 
1338                 /*
1339                  * If this symbol is defined in a non-allocatable section,
1340                  * reduce it to local symbol.
1341                  */
1342                 if (((isp = sdp->sd_isc) != 0) && isp->is_shdr &&
1343                     ((isp->is_shdr->sh_flags & SHF_ALLOC) == 0)) {
1344                         sdp->sd_flags |= (FLG_SY_REDUCED | FLG_SY_HIDDEN);
1345                 }
1346 
1347                 /*
1348                  * If this symbol originated as a SHN_SUNW_IGNORE, it will have
1349                  * been processed as an SHN_UNDEF.  Return the symbol to its
1350                  * original index for validation, and propagation to the output
1351                  * file.
1352                  */
1353                 if (sdp->sd_flags & FLG_SY_IGNORE)
1354                         sdp->sd_shndx = SHN_SUNW_IGNORE;
1355 
1356                 if (undef) {
1357                         /*
1358                          * If a non-weak reference remains undefined, or if a
1359                          * mapfile reference is not bound to the relocatable
1360                          * objects that make up the object being built, we have
1361                          * a fatal error.
1362                          *
1363                          * The exceptions are symbols which are defined to be
1364                          * found in the parent (FLG_SY_PARENT), which is really
1365                          * only meaningful for direct binding, or are defined
1366                          * external (FLG_SY_EXTERN) so as to suppress -zdefs
1367                          * errors.
1368                          *
1369                          * Register symbols are always allowed to be UNDEF.
1370                          *
1371                          * Note that we don't include references created via -u
1372                          * in the same shared object binding test.  This is for
1373                          * backward compatibility, in that a number of archive
1374                          * makefile rules used -u to cause archive extraction.
1375                          * These same rules have been cut and pasted to apply
1376                          * to shared objects, and thus although the -u reference
1377                          * is redundant, flagging it as fatal could cause some
1378                          * build to fail.  Also we have documented the use of
1379                          * -u as a mechanism to cause binding to weak version
1380                          * definitions, thus giving users an error condition
1381                          * would be incorrect.
1382                          */
1383                         if (!(sdp->sd_flags & FLG_SY_REGSYM) &&
1384                             ((sym->st_shndx == SHN_UNDEF) &&
1385                             ((ELF_ST_BIND(sym->st_info) != STB_WEAK) &&
1386                             ((sdp->sd_flags &
1387                             (FLG_SY_PARENT | FLG_SY_EXTERN)) == 0)) ||
1388                             ((sdp->sd_flags &
1389                             (FLG_SY_MAPREF | FLG_SY_MAPUSED | FLG_SY_HIDDEN |
1390                             FLG_SY_PROTECT)) == FLG_SY_MAPREF))) {
1391                                 sym_undef_entry(ofl, sdp, UNDEF, undef,
1392                                     &undef_state);
1393                                 undeferr = 1;
1394                         }
1395 
1396                 } else {
1397                         /*
1398                          * For building things like shared objects (or anything
1399                          * -znodefs), undefined symbols are allowed.
1400                          *
1401                          * If a mapfile reference remains undefined the user
1402                          * would probably like a warning at least (they've
1403                          * usually mis-spelt the reference).  Refer to the above
1404                          * comments for discussion on -u references, which
1405                          * are not tested for in the same manner.
1406                          */
1407                         if ((sdp->sd_flags &
1408                             (FLG_SY_MAPREF | FLG_SY_MAPUSED)) ==
1409                             FLG_SY_MAPREF) {
1410                                 sym_undef_entry(ofl, sdp, UNDEF, FLG_OF_WARN,
1411                                     &undef_state);
1412                                 undeferr = 1;
1413                         }
1414                 }
1415 
1416                 /*
1417                  * If this symbol comes from a dependency mark the dependency
1418                  * as required (-z ignore can result in unused dependencies
1419                  * being dropped).  If we need to record dependency versioning
1420                  * information indicate what version of the needed shared object
1421                  * this symbol is part of.  Flag the symbol as undefined if it
1422                  * has not been made available to us.
1423                  */
1424                 if ((sdp->sd_ref == REF_DYN_NEED) &&
1425                     (!(sdp->sd_flags & FLG_SY_REFRSD))) {
1426                         sdp->sd_file->ifl_flags |= FLG_IF_DEPREQD;
1427 
1428                         /*
1429                          * Capture that we've bound to a symbol that doesn't
1430                          * allow being directly bound to.
1431                          */
1432                         if (sdp->sd_flags & FLG_SY_NDIR)
1433                                 ofl->ofl_flags1 |= FLG_OF1_NGLBDIR;
1434 
1435                         if (sdp->sd_file->ifl_vercnt) {
1436                                 int             vndx;
1437                                 Ver_index       *vip;
1438 
1439                                 vndx = sdp->sd_aux->sa_dverndx;
1440                                 vip = &sdp->sd_file->ifl_verndx[vndx];
1441                                 if (vip->vi_flags & FLG_VER_AVAIL) {
1442                                         vip->vi_flags |= FLG_VER_REFER;
1443                                 } else {
1444                                         sym_undef_entry(ofl, sdp, NOTAVAIL,
1445                                             FLG_OF_FATAL, &undef_state);
1446                                         continue;
1447                                 }
1448                         }
1449                 }
1450 
1451                 /*
1452                  * Test that we do not bind to symbol supplied from an implicit
1453                  * shared object.  If a binding is from a weak reference it can
1454                  * be ignored.
1455                  */
1456                 if (needed && !undeferr && (sdp->sd_flags & FLG_SY_GLOBREF) &&
1457                     (sdp->sd_ref == REF_DYN_NEED) &&
1458                     (sdp->sd_flags & FLG_SY_NOTAVAIL)) {
1459                         sym_undef_entry(ofl, sdp, IMPLICIT, needed,
1460                             &undef_state);
1461                         if (needed == FLG_OF_FATAL)
1462                                 continue;
1463                 }
1464 
1465                 /*
1466                  * Test that a symbol isn't going to be reduced to local scope
1467                  * which actually wants to bind to a shared object - if so it's
1468                  * a fatal error.
1469                  */
1470                 if ((sdp->sd_ref == REF_DYN_NEED) &&
1471                     (sdp->sd_flags & (FLG_SY_HIDDEN | FLG_SY_PROTECT))) {
1472                         sym_undef_entry(ofl, sdp, BNDLOCAL, FLG_OF_FATAL,
1473                             &undef_state);
1474                         continue;
1475                 }
1476 
1477                 /*
1478                  * If the output image is to be versioned then all symbol
1479                  * definitions must be associated with a version.  Remove any
1480                  * versioning that might be left associated with an undefined
1481                  * symbol.
1482                  */
1483                 if (verdesc && (sdp->sd_ref == REF_REL_NEED)) {
1484                         if (sym->st_shndx == SHN_UNDEF) {
1485                                 if (sdp->sd_aux && sdp->sd_aux->sa_overndx)
1486                                         sdp->sd_aux->sa_overndx = 0;
1487                         } else {
1488                                 if (!SYM_IS_HIDDEN(sdp) && sdp->sd_aux &&
1489                                     (sdp->sd_aux->sa_overndx == 0)) {
1490                                         sym_undef_entry(ofl, sdp, NOVERSION,
1491                                             verdesc, &undef_state);
1492                                         continue;
1493                                 }
1494                         }
1495                 }
1496 
1497                 /*
1498                  * If we don't need the symbol there's no need to process it
1499                  * any further.
1500                  */
1501                 if (sdp->sd_ref == REF_DYN_SEEN)
1502                         continue;
1503 
1504                 /*
1505                  * Calculate the size and alignment requirements for the global
1506                  * .bss and .tls sections.  If we're building a relocatable
1507                  * object only account for scoped COMMON symbols (these will
1508                  * be converted to .bss references).
1509                  *
1510                  * When -z nopartial is in effect, partially initialized
1511                  * symbols are directed to the special .data section
1512                  * created for that purpose (ofl->ofl_isparexpn).
1513                  * Otherwise, partially initialized symbols go to .bss.
1514                  *
1515                  * Also refer to make_mvsections() in sunwmove.c
1516                  */
1517                 if ((sym->st_shndx == SHN_COMMON) &&
1518                     (((oflags & FLG_OF_RELOBJ) == 0) ||
1519                     (SYM_IS_HIDDEN(sdp) && (oflags & FLG_OF_PROCRED)))) {
1520                         if ((sdp->sd_move == NULL) ||
1521                             ((sdp->sd_flags & FLG_SY_PAREXPN) == 0)) {
1522                                 if (type != STT_TLS) {
1523                                         need_bss = TRUE;
1524                                         bsssize = (Xword)S_ROUND(bsssize,
1525                                             sym->st_value) + sym->st_size;
1526                                         if (sym->st_value > bssalign)
1527                                                 bssalign = sym->st_value;
1528                                 } else {
1529                                         need_tlsbss = TRUE;
1530                                         tlssize = (Xword)S_ROUND(tlssize,
1531                                             sym->st_value) + sym->st_size;
1532                                         if (sym->st_value > tlsalign)
1533                                                 tlsalign = sym->st_value;
1534                                 }
1535                         }
1536                 }
1537 
1538 #if     defined(_ELF64)
1539                 /*
1540                  * Calculate the size and alignment requirement for the global
1541                  * .lbss. TLS or partially initialized symbols do not need to be
1542                  * considered yet.
1543                  */
1544                 if ((ld_targ.t_m.m_mach == EM_AMD64) &&
1545                     (sym->st_shndx == SHN_X86_64_LCOMMON)) {
1546                         need_lbss = TRUE;
1547                         lbsssize = (Xword)S_ROUND(lbsssize, sym->st_value) +
1548                             sym->st_size;
1549                         if (sym->st_value > lbssalign)
1550                                 lbssalign = sym->st_value;
1551                 }
1552 #endif
1553                 /*
1554                  * If a symbol was referenced via the command line
1555                  * (ld -u <>, ...), then this counts as a reference against the
1556                  * symbol. Mark any section that symbol is defined in.
1557                  */
1558                 if (((isp = sdp->sd_isc) != 0) &&
1559                     (sdp->sd_flags & FLG_SY_CMDREF)) {
1560                         isp->is_flags |= FLG_IS_SECTREF;
1561                         isp->is_file->ifl_flags |= FLG_IF_FILEREF;
1562                 }
1563 
1564                 /*
1565                  * Update the symbol count and the associated name string size.
1566                  * Note, a capabilities symbol must remain as visible as a
1567                  * global symbol.  However, the runtime linker recognizes the
1568                  * hidden requirement and ensures the symbol isn't made globally
1569                  * available at runtime.
1570                  */
1571                 if (SYM_IS_HIDDEN(sdp) && (oflags & FLG_OF_PROCRED)) {
1572                         /*
1573                          * If any reductions are being processed, keep a count
1574                          * of eliminated symbols, and if the symbol is being
1575                          * reduced to local, count it's size for the .symtab.
1576                          */
1577                         if (sdp->sd_flags & FLG_SY_ELIM) {
1578                                 ofl->ofl_elimcnt++;
1579                         } else {
1580                                 ofl->ofl_scopecnt++;
1581                                 if ((((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
1582                                     sym->st_name) && (st_insert(ofl->ofl_strtab,
1583                                     sdp->sd_name) == -1))
1584                                         return (S_ERROR);
1585                                 if (allow_ldynsym && sym->st_name &&
1586                                     ldynsym_symtype[type]) {
1587                                         ofl->ofl_dynscopecnt++;
1588                                         if (st_insert(ofl->ofl_dynstrtab,
1589                                             sdp->sd_name) == -1)
1590                                                 return (S_ERROR);
1591                                         /* Include it in sort section? */
1592                                         DYNSORT_COUNT(sdp, sym, type, ++);
1593                                 }
1594                         }
1595                 } else {
1596                         ofl->ofl_globcnt++;
1597 
1598                         /*
1599                          * Check to see if this global variable should go into
1600                          * a sort section. Sort sections require a
1601                          * .SUNW_ldynsym section, so, don't check unless a
1602                          * .SUNW_ldynsym is allowed.
1603                          */
1604                         if (allow_ldynsym)
1605                                 DYNSORT_COUNT(sdp, sym, type, ++);
1606 
1607                         /*
1608                          * If global direct bindings are in effect, or this
1609                          * symbol has bound to a dependency which was specified
1610                          * as requiring direct bindings, and it hasn't
1611                          * explicitly been defined as a non-direct binding
1612                          * symbol, mark it.
1613                          */
1614                         if (((ofl->ofl_dtflags_1 & DF_1_DIRECT) || (isp &&
1615                             (isp->is_file->ifl_flags & FLG_IF_DIRECT))) &&
1616                             ((sdp->sd_flags & FLG_SY_NDIR) == 0))
1617                                 sdp->sd_flags |= FLG_SY_DIR;
1618 
1619                         /*
1620                          * Insert the symbol name.
1621                          */
1622                         if (((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
1623                             sym->st_name) {
1624                                 if (st_insert(ofl->ofl_strtab,
1625                                     sdp->sd_name) == -1)
1626                                         return (S_ERROR);
1627 
1628                                 if (!(ofl->ofl_flags & FLG_OF_RELOBJ) &&
1629                                     (st_insert(ofl->ofl_dynstrtab,
1630                                     sdp->sd_name) == -1))
1631                                         return (S_ERROR);
1632                         }
1633 
1634                         /*
1635                          * If this section offers a global symbol - record that
1636                          * fact.
1637                          */
1638                         if (isp) {
1639                                 isp->is_flags |= FLG_IS_SECTREF;
1640                                 isp->is_file->ifl_flags |= FLG_IF_FILEREF;
1641                         }
1642                 }
1643         }
1644 
1645         /*
1646          * Guidance: Use -z defs|nodefs when building shared objects.
1647          *
1648          * Our caller issues this, unless we mask it out here. So we mask it
1649          * out unless we've issued at least one warnings or fatal error.
1650          */
1651         if (!((oflags & FLG_OF_SHAROBJ) && OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS) &&
1652             (undef_state & (FLG_OF_FATAL | FLG_OF_WARN))))
1653                 ofl->ofl_guideflags |= FLG_OFG_NO_DEFS;
1654 
1655         /*
1656          * If we've encountered a fatal error during symbol validation then
1657          * return now.
1658          */
1659         if (ofl->ofl_flags & FLG_OF_FATAL)
1660                 return (1);
1661 
1662         /*
1663          * Now that symbol resolution is completed, scan any register symbols.
1664          * From now on, we're only interested in those that contribute to the
1665          * output file.
1666          */
1667         if (ofl->ofl_regsyms) {
1668                 int     ndx;
1669 
1670                 for (ndx = 0; ndx < ofl->ofl_regsymsno; ndx++) {
1671                         if ((sdp = ofl->ofl_regsyms[ndx]) == NULL)
1672                                 continue;
1673                         if (sdp->sd_ref != REF_REL_NEED) {
1674                                 ofl->ofl_regsyms[ndx] = NULL;
1675                                 continue;
1676                         }
1677 
1678                         ofl->ofl_regsymcnt++;
1679                         if (sdp->sd_sym->st_name == 0)
1680                                 sdp->sd_name = MSG_ORIG(MSG_STR_EMPTY);
1681 
1682                         if (SYM_IS_HIDDEN(sdp) ||
1683                             (ELF_ST_BIND(sdp->sd_sym->st_info) == STB_LOCAL))
1684                                 ofl->ofl_lregsymcnt++;
1685                 }
1686         }
1687 
1688         /*
1689          * Generate the .bss section now that we know its size and alignment.
1690          */
1691         if (need_bss) {
1692                 if (ld_make_bss(ofl, bsssize, bssalign,
1693                     ld_targ.t_id.id_bss) == S_ERROR)
1694                         return (S_ERROR);
1695         }
1696         if (need_tlsbss) {
1697                 if (ld_make_bss(ofl, tlssize, tlsalign,
1698                     ld_targ.t_id.id_tlsbss) == S_ERROR)
1699                         return (S_ERROR);
1700         }
1701 #if     defined(_ELF64)
1702         if ((ld_targ.t_m.m_mach == EM_AMD64) &&
1703             need_lbss && !(oflags & FLG_OF_RELOBJ)) {
1704                 if (ld_make_bss(ofl, lbsssize, lbssalign,
1705                     ld_targ.t_id.id_lbss) == S_ERROR)
1706                         return (S_ERROR);
1707         }
1708 #endif
1709         /*
1710          * Determine what entry point symbol we need, and if found save its
1711          * symbol descriptor so that we can update the ELF header entry with the
1712          * symbols value later (see update_oehdr).  Make sure the symbol is
1713          * tagged to ensure its update in case -s is in effect.  Use any -e
1714          * option first, or the default entry points `_start' and `main'.
1715          */
1716         ret = 0;
1717         if (ofl->ofl_entry) {
1718                 if ((sdp = ld_sym_find(ofl->ofl_entry, SYM_NOHASH,
1719                     NULL, ofl)) == NULL) {
1720                         ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_ARG_NOENTRY),
1721                             ofl->ofl_entry);
1722                         ret++;
1723                 } else if (ensure_sym_local(ofl, sdp,
1724                     MSG_INTL(MSG_SYM_ENTRY)) != 0) {
1725                         ret++;
1726                 } else {
1727                         ofl->ofl_entry = (void *)sdp;
1728                 }
1729         } else if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_START),
1730             SYM_NOHASH, NULL, ofl)) != NULL) && (ensure_sym_local(ofl,
1731             sdp, 0) == 0)) {
1732                 ofl->ofl_entry = (void *)sdp;
1733 
1734         } else if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_MAIN),
1735             SYM_NOHASH, NULL, ofl)) != NULL) && (ensure_sym_local(ofl,
1736             sdp, 0) == 0)) {
1737                 ofl->ofl_entry = (void *)sdp;
1738         }
1739 
1740         /*
1741          * If ld -zdtrace=<sym> was given, then validate that the symbol is
1742          * defined within the current object being built.
1743          */
1744         if ((sdp = ofl->ofl_dtracesym) != 0)
1745                 ret += ensure_sym_local(ofl, sdp, MSG_ORIG(MSG_STR_DTRACE));
1746 
1747         /*
1748          * If any initarray, finiarray or preinitarray functions have been
1749          * requested, make sure they are defined within the current object
1750          * being built.
1751          */
1752         if (ofl->ofl_initarray) {
1753                 ret += ensure_array_local(ofl, ofl->ofl_initarray,
1754                     MSG_ORIG(MSG_SYM_INITARRAY));
1755         }
1756         if (ofl->ofl_finiarray) {
1757                 ret += ensure_array_local(ofl, ofl->ofl_finiarray,
1758                     MSG_ORIG(MSG_SYM_FINIARRAY));
1759         }
1760         if (ofl->ofl_preiarray) {
1761                 ret += ensure_array_local(ofl, ofl->ofl_preiarray,
1762                     MSG_ORIG(MSG_SYM_PREINITARRAY));
1763         }
1764 
1765         if (ret)
1766                 return (S_ERROR);
1767 
1768         /*
1769          * If we're required to record any needed dependencies versioning
1770          * information calculate it now that all symbols have been validated.
1771          */
1772         if ((oflags & (FLG_OF_VERNEED | FLG_OF_NOVERSEC)) == FLG_OF_VERNEED)
1773                 return (ld_vers_check_need(ofl));
1774         else
1775                 return (1);
1776 }
1777 
1778 /*
1779  * qsort(3c) comparison function.  As an optimization for associating weak
1780  * symbols to their strong counterparts sort global symbols according to their
1781  * section index, address and binding.
1782  */
1783 static int
1784 compare(const void *sdpp1, const void *sdpp2)
1785 {
1786         Sym_desc        *sdp1 = *((Sym_desc **)sdpp1);
1787         Sym_desc        *sdp2 = *((Sym_desc **)sdpp2);
1788         Sym             *sym1, *sym2;
1789         uchar_t         bind1, bind2;
1790 
1791         /*
1792          * Symbol descriptors may be zero, move these to the front of the
1793          * sorted array.
1794          */
1795         if (sdp1 == NULL)
1796                 return (-1);
1797         if (sdp2 == NULL)
1798                 return (1);
1799 
1800         sym1 = sdp1->sd_sym;
1801         sym2 = sdp2->sd_sym;
1802 
1803         /*
1804          * Compare the symbols section index.  This is important when sorting
1805          * the symbol tables of relocatable objects.  In this case, a symbols
1806          * value is the offset within the associated section, and thus many
1807          * symbols can have the same value, but are effectively different
1808          * addresses.
1809          */
1810         if (sym1->st_shndx > sym2->st_shndx)
1811                 return (1);
1812         if (sym1->st_shndx < sym2->st_shndx)
1813                 return (-1);
1814 
1815         /*
1816          * Compare the symbols value (address).
1817          */
1818         if (sym1->st_value > sym2->st_value)
1819                 return (1);
1820         if (sym1->st_value < sym2->st_value)
1821                 return (-1);
1822 
1823         bind1 = ELF_ST_BIND(sym1->st_info);
1824         bind2 = ELF_ST_BIND(sym2->st_info);
1825 
1826         /*
1827          * If two symbols have the same address place the weak symbol before
1828          * any strong counterpart.
1829          */
1830         if (bind1 > bind2)
1831                 return (-1);
1832         if (bind1 < bind2)
1833                 return (1);
1834 
1835         return (0);
1836 }
1837 
1838 /*
1839  * Issue a MSG_SYM_BADADDR error from ld_sym_process(). This error
1840  * is issued when a symbol address/size is not contained by the
1841  * target section.
1842  *
1843  * Such objects are at least partially corrupt, and the user would
1844  * be well advised to be skeptical of them, and to ask their compiler
1845  * supplier to fix the problem. However, a distinction needs to be
1846  * made between symbols that reference readonly text, and those that
1847  * access writable data. Other than throwing off profiling results,
1848  * the readonly section case is less serious. We have encountered
1849  * such objects in the field. In order to allow existing objects
1850  * to continue working, we issue a warning rather than a fatal error
1851  * if the symbol is against readonly text. Other cases are fatal.
1852  */
1853 static void
1854 issue_badaddr_msg(Ifl_desc *ifl, Ofl_desc *ofl, Sym_desc *sdp,
1855     Sym *sym, Word shndx)
1856 {
1857         Error           err;
1858         const char      *msg;
1859 
1860         if ((sdp->sd_isc->is_shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) ==
1861             SHF_ALLOC) {
1862                 msg = MSG_INTL(MSG_SYM_BADADDR_ROTXT);
1863                 err = ERR_WARNING;
1864         } else {
1865                 msg = MSG_INTL(MSG_SYM_BADADDR);
1866                 err = ERR_FATAL;
1867         }
1868 
1869         ld_eprintf(ofl, err, msg, demangle(sdp->sd_name),
1870             ifl->ifl_name, shndx, sdp->sd_isc->is_name,
1871             EC_XWORD(sdp->sd_isc->is_shdr->sh_size),
1872             EC_XWORD(sym->st_value), EC_XWORD(sym->st_size));
1873 }
1874 
1875 /*
1876  * Global symbols that are candidates for translation to local capability
1877  * symbols under -z symbolcap, are maintained on a local symbol list.  Once
1878  * all symbols of a file are processed, this list is traversed to cull any
1879  * unnecessary weak symbol aliases.
1880  */
1881 typedef struct {
1882         Sym_desc        *c_nsdp;        /* new lead symbol */
1883         Sym_desc        *c_osdp;        /* original symbol */
1884         Cap_group       *c_group;       /* symbol capability group */
1885         Word            c_ndx;          /* symbol index */
1886 } Cap_pair;
1887 
1888 /*
1889  * Process the symbol table for the specified input file.  At this point all
1890  * input sections from this input file have been assigned an input section
1891  * descriptor which is saved in the `ifl_isdesc' array.
1892  *
1893  *  -   local symbols are saved (as is) if the input file is a  relocatable
1894  *      object
1895  *
1896  *  -   global symbols are added to the linkers internal symbol table if they
1897  *      are not already present, otherwise a symbol resolution function is
1898  *      called upon to resolve the conflict.
1899  */
1900 uintptr_t
1901 ld_sym_process(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl)
1902 {
1903         /*
1904          * This macro tests the given symbol to see if it is out of
1905          * range relative to the section it references.
1906          *
1907          * entry:
1908          *      - ifl is a relative object (ET_REL)
1909          *      _sdp - Symbol descriptor
1910          *      _sym - Symbol
1911          *      _type - Symbol type
1912          *
1913          * The following are tested:
1914          *      - Symbol length is non-zero
1915          *      - Symbol type is a type that references code or data
1916          *      - Referenced section is not 0 (indicates an UNDEF symbol)
1917          *        and is not in the range of special values above SHN_LORESERVE
1918          *        (excluding SHN_XINDEX, which is OK).
1919          *      - We have a valid section header for the target section
1920          *
1921          * If the above are all true, and the symbol position is not
1922          * contained by the target section, this macro evaluates to
1923          * True (1). Otherwise, False(0).
1924          */
1925 #define SYM_LOC_BADADDR(_sdp, _sym, _type) \
1926         (_sym->st_size && dynsymsort_symtype[_type] && \
1927         (_sym->st_shndx != SHN_UNDEF) && \
1928         ((_sym->st_shndx < SHN_LORESERVE) || \
1929                 (_sym->st_shndx == SHN_XINDEX)) && \
1930         _sdp->sd_isc && _sdp->sd_isc->is_shdr && \
1931         ((_sym->st_value + _sym->st_size) > _sdp->sd_isc->is_shdr->sh_size))
1932 
1933         Conv_inv_buf_t  inv_buf;
1934         Sym             *sym = (Sym *)isc->is_indata->d_buf;
1935         Word            *symshndx = NULL;
1936         Shdr            *shdr = isc->is_shdr;
1937         Sym_desc        *sdp;
1938         size_t          strsize;
1939         char            *strs;
1940         uchar_t         type, bind;
1941         Word            ndx, hash, local, total;
1942         uchar_t         osabi = ifl->ifl_ehdr->e_ident[EI_OSABI];
1943         Half            mach = ifl->ifl_ehdr->e_machine;
1944         Half            etype = ifl->ifl_ehdr->e_type;
1945         int             etype_rel;
1946         const char      *symsecname, *strsecname;
1947         Word            symsecndx;
1948         avl_index_t     where;
1949         int             test_gnu_hidden_bit, weak;
1950         Cap_desc        *cdp = NULL;
1951         Alist           *cappairs = NULL;
1952 
1953         /*
1954          * Its possible that a file may contain more that one symbol table,
1955          * ie. .dynsym and .symtab in a shared library.  Only process the first
1956          * table (here, we assume .dynsym comes before .symtab).
1957          */
1958         if (ifl->ifl_symscnt)
1959                 return (1);
1960 
1961         if (isc->is_symshndx)
1962                 symshndx = isc->is_symshndx->is_indata->d_buf;
1963 
1964         DBG_CALL(Dbg_syms_process(ofl->ofl_lml, ifl));
1965 
1966         symsecndx = isc->is_scnndx;
1967         if (isc->is_name)
1968                 symsecname = isc->is_name;
1969         else
1970                 symsecname = MSG_ORIG(MSG_STR_EMPTY);
1971 
1972         /*
1973          * From the symbol tables section header information determine which
1974          * strtab table is needed to locate the actual symbol names.
1975          */
1976         if (ifl->ifl_flags & FLG_IF_HSTRTAB) {
1977                 ndx = shdr->sh_link;
1978                 if ((ndx == 0) || (ndx >= ifl->ifl_shnum)) {
1979                         ld_eprintf(ofl, ERR_FATAL,
1980                             MSG_INTL(MSG_FIL_INVSHLINK), ifl->ifl_name,
1981                             EC_WORD(symsecndx), symsecname, EC_XWORD(ndx));
1982                         return (S_ERROR);
1983                 }
1984                 strsize = ifl->ifl_isdesc[ndx]->is_shdr->sh_size;
1985                 strs = ifl->ifl_isdesc[ndx]->is_indata->d_buf;
1986                 if (ifl->ifl_isdesc[ndx]->is_name)
1987                         strsecname = ifl->ifl_isdesc[ndx]->is_name;
1988                 else
1989                         strsecname = MSG_ORIG(MSG_STR_EMPTY);
1990         } else {
1991                 /*
1992                  * There is no string table section in this input file
1993                  * although there are symbols in this symbol table section.
1994                  * This means that these symbols do not have names.
1995                  * Currently, only scratch register symbols are allowed
1996                  * not to have names.
1997                  */
1998                 strsize = 0;
1999                 strs = (char *)MSG_ORIG(MSG_STR_EMPTY);
2000                 strsecname = MSG_ORIG(MSG_STR_EMPTY);
2001         }
2002 
2003         /*
2004          * Determine the number of local symbols together with the total
2005          * number we have to process.
2006          */
2007         total = (Word)(shdr->sh_size / shdr->sh_entsize);
2008         local = shdr->sh_info;
2009 
2010         /*
2011          * Allocate a symbol table index array and a local symbol array
2012          * (global symbols are processed and added to the ofl->ofl_symbkt[]
2013          * array).  If we are dealing with a relocatable object, allocate the
2014          * local symbol descriptors.  If this isn't a relocatable object we
2015          * still have to process any shared object locals to determine if any
2016          * register symbols exist.  Although these aren't added to the output
2017          * image, they are used as part of symbol resolution.
2018          */
2019         if ((ifl->ifl_oldndx = libld_malloc((size_t)(total *
2020             sizeof (Sym_desc *)))) == NULL)
2021                 return (S_ERROR);
2022         etype_rel = (etype == ET_REL);
2023         if (etype_rel && local) {
2024                 if ((ifl->ifl_locs =
2025                     libld_calloc(sizeof (Sym_desc), local)) == NULL)
2026                         return (S_ERROR);
2027                 /* LINTED */
2028                 ifl->ifl_locscnt = (Word)local;
2029         }
2030         ifl->ifl_symscnt = total;
2031 
2032         /*
2033          * If there are local symbols to save add them to the symbol table
2034          * index array.
2035          */
2036         if (local) {
2037                 int             allow_ldynsym = OFL_ALLOW_LDYNSYM(ofl);
2038                 Sym_desc        *last_file_sdp = NULL;
2039                 int             last_file_ndx = 0;
2040 
2041                 for (sym++, ndx = 1; ndx < local; sym++, ndx++) {
2042                         sd_flag_t       sdflags = FLG_SY_CLEAN;
2043                         Word            shndx;
2044                         const char      *name;
2045                         Sym_desc        *rsdp;
2046                         int             shndx_bad = 0;
2047                         int             symtab_enter = 1;
2048 
2049                         /*
2050                          * Determine and validate the associated section index.
2051                          */
2052                         if (symshndx && (sym->st_shndx == SHN_XINDEX)) {
2053                                 shndx = symshndx[ndx];
2054                         } else if ((shndx = sym->st_shndx) >= SHN_LORESERVE) {
2055                                 sdflags |= FLG_SY_SPECSEC;
2056                         } else if (shndx > ifl->ifl_ehdr->e_shnum) {
2057                                 /* We need the name before we can issue error */
2058                                 shndx_bad = 1;
2059                         }
2060 
2061                         /*
2062                          * Check if st_name has a valid value or not.
2063                          */
2064                         if ((name = string(ofl, ifl, sym, strs, strsize, ndx,
2065                             shndx, symsecndx, symsecname, strsecname,
2066                             &sdflags)) == NULL)
2067                                 continue;
2068 
2069                         /*
2070                          * Now that we have the name, if the section index
2071                          * was bad, report it.
2072                          */
2073                         if (shndx_bad) {
2074                                 ld_eprintf(ofl, ERR_WARNING,
2075                                     MSG_INTL(MSG_SYM_INVSHNDX),
2076                                     demangle_symname(name, symsecname, ndx),
2077                                     ifl->ifl_name,
2078                                     conv_sym_shndx(osabi, mach, sym->st_shndx,
2079                                     CONV_FMT_DECIMAL, &inv_buf));
2080                                 continue;
2081                         }
2082 
2083                         /*
2084                          * If this local symbol table originates from a shared
2085                          * object, then we're only interested in recording
2086                          * register symbols.  As local symbol descriptors aren't
2087                          * allocated for shared objects, one will be allocated
2088                          * to associated with the register symbol.  This symbol
2089                          * won't become part of the output image, but we must
2090                          * process it to test for register conflicts.
2091                          */
2092                         rsdp = sdp = NULL;
2093                         if (sdflags & FLG_SY_REGSYM) {
2094                                 /*
2095                                  * The presence of FLG_SY_REGSYM means that
2096                                  * the pointers in ld_targ.t_ms are non-NULL.
2097                                  */
2098                                 rsdp = (*ld_targ.t_ms.ms_reg_find)(sym, ofl);
2099                                 if (rsdp != 0) {
2100                                         /*
2101                                          * The fact that another register def-
2102                                          * inition has been found is fatal.
2103                                          * Call the verification routine to get
2104                                          * the error message and move on.
2105                                          */
2106                                         (void) (*ld_targ.t_ms.ms_reg_check)
2107                                             (rsdp, sym, name, ifl, ofl);
2108                                         continue;
2109                                 }
2110 
2111                                 if (etype == ET_DYN) {
2112                                         if ((sdp = libld_calloc(
2113                                             sizeof (Sym_desc), 1)) == NULL)
2114                                                 return (S_ERROR);
2115                                         sdp->sd_ref = REF_DYN_SEEN;
2116 
2117                                         /* Will not appear in output object */
2118                                         symtab_enter = 0;
2119                                 }
2120                         } else if (etype == ET_DYN)
2121                                 continue;
2122 
2123                         /*
2124                          * Fill in the remaining symbol descriptor information.
2125                          */
2126                         if (sdp == NULL) {
2127                                 sdp = &(ifl->ifl_locs[ndx]);
2128                                 sdp->sd_ref = REF_REL_NEED;
2129                                 sdp->sd_symndx = ndx;
2130                         }
2131                         if (rsdp == NULL) {
2132                                 sdp->sd_name = name;
2133                                 sdp->sd_sym = sym;
2134                                 sdp->sd_shndx = shndx;
2135                                 sdp->sd_flags = sdflags;
2136                                 sdp->sd_file = ifl;
2137                                 ifl->ifl_oldndx[ndx] = sdp;
2138                         }
2139 
2140                         DBG_CALL(Dbg_syms_entry(ofl->ofl_lml, ndx, sdp));
2141 
2142                         /*
2143                          * Reclassify any SHN_SUNW_IGNORE symbols to SHN_UNDEF
2144                          * so as to simplify future processing.
2145                          */
2146                         if (sym->st_shndx == SHN_SUNW_IGNORE) {
2147                                 sdp->sd_shndx = shndx = SHN_UNDEF;
2148                                 sdp->sd_flags |= (FLG_SY_IGNORE | FLG_SY_ELIM);
2149                         }
2150 
2151                         /*
2152                          * Process any register symbols.
2153                          */
2154                         if (sdp->sd_flags & FLG_SY_REGSYM) {
2155                                 /*
2156                                  * Add a diagnostic to indicate we've caught a
2157                                  * register symbol, as this can be useful if a
2158                                  * register conflict is later discovered.
2159                                  */
2160                                 DBG_CALL(Dbg_syms_entered(ofl, sym, sdp));
2161 
2162                                 /*
2163                                  * If this register symbol hasn't already been
2164                                  * recorded, enter it now.
2165                                  *
2166                                  * The presence of FLG_SY_REGSYM means that
2167                                  * the pointers in ld_targ.t_ms are non-NULL.
2168                                  */
2169                                 if ((rsdp == NULL) &&
2170                                     ((*ld_targ.t_ms.ms_reg_enter)(sdp, ofl) ==
2171                                     0))
2172                                         return (S_ERROR);
2173                         }
2174 
2175                         /*
2176                          * Assign an input section.
2177                          */
2178                         if ((sym->st_shndx != SHN_UNDEF) &&
2179                             ((sdp->sd_flags & FLG_SY_SPECSEC) == 0))
2180                                 sdp->sd_isc = ifl->ifl_isdesc[shndx];
2181 
2182                         /*
2183                          * If this symbol falls within the range of a section
2184                          * being discarded, then discard the symbol itself.
2185                          * There is no reason to keep this local symbol.
2186                          */
2187                         if (sdp->sd_isc &&
2188                             (sdp->sd_isc->is_flags & FLG_IS_DISCARD)) {
2189                                 sdp->sd_flags |= FLG_SY_ISDISC;
2190                                 DBG_CALL(Dbg_syms_discarded(ofl->ofl_lml, sdp));
2191                                 continue;
2192                         }
2193 
2194                         /*
2195                          * Skip any section symbols as new versions of these
2196                          * will be created.
2197                          */
2198                         if ((type = ELF_ST_TYPE(sym->st_info)) == STT_SECTION) {
2199                                 if (sym->st_shndx == SHN_UNDEF) {
2200                                         ld_eprintf(ofl, ERR_WARNING,
2201                                             MSG_INTL(MSG_SYM_INVSHNDX),
2202                                             demangle_symname(name, symsecname,
2203                                             ndx), ifl->ifl_name,
2204                                             conv_sym_shndx(osabi, mach,
2205                                             sym->st_shndx, CONV_FMT_DECIMAL,
2206                                             &inv_buf));
2207                                 }
2208                                 continue;
2209                         }
2210 
2211                         /*
2212                          * For a relocatable object, if this symbol is defined
2213                          * and has non-zero length and references an address
2214                          * within an associated section, then check its extents
2215                          * to make sure the section boundaries encompass it.
2216                          * If they don't, the ELF file is corrupt.
2217                          */
2218                         if (etype_rel) {
2219                                 if (SYM_LOC_BADADDR(sdp, sym, type)) {
2220                                         issue_badaddr_msg(ifl, ofl, sdp,
2221                                             sym, shndx);
2222                                         if (ofl->ofl_flags & FLG_OF_FATAL)
2223                                                 continue;
2224                                 }
2225 
2226                                 /*
2227                                  * We have observed relocatable objects
2228                                  * containing identical adjacent STT_FILE
2229                                  * symbols. Discard any other than the first,
2230                                  * as they are all equivalent and the extras
2231                                  * do not add information.
2232                                  *
2233                                  * For the purpose of this test, we assume
2234                                  * that only the symbol type and the string
2235                                  * table offset (st_name) matter.
2236                                  */
2237                                 if (type == STT_FILE) {
2238                                         int toss = (last_file_sdp != NULL) &&
2239                                             ((ndx - 1) == last_file_ndx) &&
2240                                             (sym->st_name ==
2241                                             last_file_sdp->sd_sym->st_name);
2242 
2243                                         last_file_sdp = sdp;
2244                                         last_file_ndx = ndx;
2245                                         if (toss) {
2246                                                 sdp->sd_flags |= FLG_SY_INVALID;
2247                                                 DBG_CALL(Dbg_syms_dup_discarded(
2248                                                     ofl->ofl_lml, ndx, sdp));
2249                                                 continue;
2250                                         }
2251                                 }
2252                         }
2253 
2254 
2255                         /*
2256                          * Sanity check for TLS
2257                          */
2258                         if ((sym->st_size != 0) && ((type == STT_TLS) &&
2259                             (sym->st_shndx != SHN_COMMON))) {
2260                                 Is_desc *isp = sdp->sd_isc;
2261 
2262                                 if ((isp == NULL) || (isp->is_shdr == NULL) ||
2263                                     ((isp->is_shdr->sh_flags & SHF_TLS) == 0)) {
2264                                         ld_eprintf(ofl, ERR_FATAL,
2265                                             MSG_INTL(MSG_SYM_TLS),
2266                                             demangle(sdp->sd_name),
2267                                             ifl->ifl_name);
2268                                         continue;
2269                                 }
2270                         }
2271 
2272                         /*
2273                          * Carry our some basic sanity checks (these are just
2274                          * some of the erroneous symbol entries we've come
2275                          * across, there's probably a lot more).  The symbol
2276                          * will not be carried forward to the output file, which
2277                          * won't be a problem unless a relocation is required
2278                          * against it.
2279                          */
2280                         if (((sdp->sd_flags & FLG_SY_SPECSEC) &&
2281                             ((sym->st_shndx == SHN_COMMON)) ||
2282                             ((type == STT_FILE) &&
2283                             (sym->st_shndx != SHN_ABS))) ||
2284                             (sdp->sd_isc && (sdp->sd_isc->is_osdesc == NULL))) {
2285                                 ld_eprintf(ofl, ERR_WARNING,
2286                                     MSG_INTL(MSG_SYM_INVSHNDX),
2287                                     demangle_symname(name, symsecname, ndx),
2288                                     ifl->ifl_name,
2289                                     conv_sym_shndx(osabi, mach, sym->st_shndx,
2290                                     CONV_FMT_DECIMAL, &inv_buf));
2291                                 sdp->sd_isc = NULL;
2292                                 sdp->sd_flags |= FLG_SY_INVALID;
2293                                 continue;
2294                         }
2295 
2296                         /*
2297                          * As these local symbols will become part of the output
2298                          * image, record their number and name string size.
2299                          * Globals are counted after all input file processing
2300                          * (and hence symbol resolution) is complete during
2301                          * sym_validate().
2302                          */
2303                         if (!(ofl->ofl_flags & FLG_OF_REDLSYM) &&
2304                             symtab_enter) {
2305                                 ofl->ofl_locscnt++;
2306 
2307                                 if ((((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
2308                                     sym->st_name) && (st_insert(ofl->ofl_strtab,
2309                                     sdp->sd_name) == -1))
2310                                         return (S_ERROR);
2311 
2312                                 if (allow_ldynsym && sym->st_name &&
2313                                     ldynsym_symtype[type]) {
2314                                         ofl->ofl_dynlocscnt++;
2315                                         if (st_insert(ofl->ofl_dynstrtab,
2316                                             sdp->sd_name) == -1)
2317                                                 return (S_ERROR);
2318                                         /* Include it in sort section? */
2319                                         DYNSORT_COUNT(sdp, sym, type, ++);
2320                                 }
2321                         }
2322                 }
2323         }
2324 
2325         /*
2326          * The GNU ld interprets the top bit of the 16-bit Versym value
2327          * (0x8000) as the "hidden" bit. If this bit is set, the linker
2328          * is supposed to act as if that symbol does not exist. The Solaris
2329          * linker does not support this mechanism, or the model of interface
2330          * evolution that it allows, but we honor it in GNU ld produced
2331          * objects in order to interoperate with them.
2332          *
2333          * Determine if we should honor the GNU hidden bit for this file.
2334          */
2335         test_gnu_hidden_bit = ((ifl->ifl_flags & FLG_IF_GNUVER) != 0) &&
2336             (ifl->ifl_versym != NULL);
2337 
2338         /*
2339          * Determine whether object capabilities for this file are being
2340          * converted into symbol capabilities.  If so, global function symbols,
2341          * and initialized global data symbols, need special translation and
2342          * processing.
2343          */
2344         if ((etype == ET_REL) && (ifl->ifl_flags & FLG_IF_OTOSCAP))
2345                 cdp = ifl->ifl_caps;
2346 
2347         /*
2348          * Now scan the global symbols entering them in the internal symbol
2349          * table or resolving them as necessary.
2350          */
2351         sym = (Sym *)isc->is_indata->d_buf;
2352         sym += local;
2353         weak = 0;
2354         /* LINTED */
2355         for (ndx = (int)local; ndx < total; sym++, ndx++) {
2356                 const char      *name;
2357                 sd_flag_t       sdflags = 0;
2358                 Word            shndx;
2359                 int             shndx_bad = 0;
2360                 Sym             *nsym = sym;
2361                 Cap_pair        *cpp = NULL;
2362                 uchar_t         ntype;
2363 
2364                 /*
2365                  * Determine and validate the associated section index.
2366                  */
2367                 if (symshndx && (nsym->st_shndx == SHN_XINDEX)) {
2368                         shndx = symshndx[ndx];
2369                 } else if ((shndx = nsym->st_shndx) >= SHN_LORESERVE) {
2370                         sdflags |= FLG_SY_SPECSEC;
2371                 } else if (shndx > ifl->ifl_ehdr->e_shnum) {
2372                         /* We need the name before we can issue error */
2373                         shndx_bad = 1;
2374                 }
2375 
2376                 /*
2377                  * Check if st_name has a valid value or not.
2378                  */
2379                 if ((name = string(ofl, ifl, nsym, strs, strsize, ndx, shndx,
2380                     symsecndx, symsecname, strsecname, &sdflags)) == NULL)
2381                         continue;
2382 
2383                 /*
2384                  * Now that we have the name, report an erroneous section index.
2385                  */
2386                 if (shndx_bad) {
2387                         ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_INVSHNDX),
2388                             demangle_symname(name, symsecname, ndx),
2389                             ifl->ifl_name,
2390                             conv_sym_shndx(osabi, mach, nsym->st_shndx,
2391                             CONV_FMT_DECIMAL, &inv_buf));
2392                         continue;
2393                 }
2394 
2395                 /*
2396                  * Test for the GNU hidden bit, and ignore symbols that
2397                  * have it set.
2398                  */
2399                 if (test_gnu_hidden_bit &&
2400                     ((ifl->ifl_versym[ndx] & 0x8000) != 0))
2401                         continue;
2402 
2403                 /*
2404                  * The linker itself will generate symbols for _end, _etext,
2405                  * _edata, _DYNAMIC and _PROCEDURE_LINKAGE_TABLE_, so don't
2406                  * bother entering these symbols from shared objects.  This
2407                  * results in some wasted resolution processing, which is hard
2408                  * to feel, but if nothing else, pollutes diagnostic relocation
2409                  * output.
2410                  */
2411                 if (name[0] && (etype == ET_DYN) && (nsym->st_size == 0) &&
2412                     (ELF_ST_TYPE(nsym->st_info) == STT_OBJECT) &&
2413                     (name[0] == '_') && ((name[1] == 'e') ||
2414                     (name[1] == 'D') || (name[1] == 'P')) &&
2415                     ((strcmp(name, MSG_ORIG(MSG_SYM_ETEXT_U)) == 0) ||
2416                     (strcmp(name, MSG_ORIG(MSG_SYM_EDATA_U)) == 0) ||
2417                     (strcmp(name, MSG_ORIG(MSG_SYM_END_U)) == 0) ||
2418                     (strcmp(name, MSG_ORIG(MSG_SYM_DYNAMIC_U)) == 0) ||
2419                     (strcmp(name, MSG_ORIG(MSG_SYM_PLKTBL_U)) == 0))) {
2420                         ifl->ifl_oldndx[ndx] = 0;
2421                         continue;
2422                 }
2423 
2424                 /*
2425                  * The '-z wrap=XXX' option emulates the GNU ld --wrap=XXX
2426                  * option. When XXX is the symbol to be wrapped:
2427                  *
2428                  *  -   An undefined reference to XXX is converted to __wrap_XXX
2429                  *  -   An undefined reference to __real_XXX is converted to XXX
2430                  *
2431                  * The idea is that the user can supply a wrapper function
2432                  * __wrap_XXX that does some work, and then uses the name
2433                  * __real_XXX to pass the call on to the real function. The
2434                  * wrapper objects are linked with the original unmodified
2435                  * objects to produce a wrapped version of the output object.
2436                  */
2437                 if (ofl->ofl_wrap && name[0] && (shndx == SHN_UNDEF)) {
2438                         WrapSymNode wsn, *wsnp;
2439 
2440                         /*
2441                          * If this is the __real_XXX form, advance the
2442                          * pointer to reference the wrapped name.
2443                          */
2444                         wsn.wsn_name = name;
2445                         if ((*name == '_') &&
2446                             (strncmp(name, MSG_ORIG(MSG_STR_UU_REAL_U),
2447                             MSG_STR_UU_REAL_U_SIZE) == 0))
2448                                 wsn.wsn_name += MSG_STR_UU_REAL_U_SIZE;
2449 
2450                         /*
2451                          * Is this symbol in the wrap AVL tree? If so, map
2452                          * XXX to __wrap_XXX, and __real_XXX to XXX. Note that
2453                          * wsn.wsn_name will equal the current value of name
2454                          * if the __real_ prefix is not present.
2455                          */
2456                         if ((wsnp = avl_find(ofl->ofl_wrap, &wsn, 0)) != NULL) {
2457                                 const char *old_name = name;
2458 
2459                                 name = (wsn.wsn_name == name) ?
2460                                     wsnp->wsn_wrapname : wsn.wsn_name;
2461                                 DBG_CALL(Dbg_syms_wrap(ofl->ofl_lml, ndx,
2462                                     old_name, name));
2463                         }
2464                 }
2465 
2466                 /*
2467                  * Determine and validate the symbols binding.
2468                  */
2469                 bind = ELF_ST_BIND(nsym->st_info);
2470                 if ((bind != STB_GLOBAL) && (bind != STB_WEAK)) {
2471                         ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_NONGLOB),
2472                             demangle_symname(name, symsecname, ndx),
2473                             ifl->ifl_name,
2474                             conv_sym_info_bind(bind, 0, &inv_buf));
2475                         continue;
2476                 }
2477                 if (bind == STB_WEAK)
2478                         weak++;
2479 
2480                 /*
2481                  * If this symbol falls within the range of a section being
2482                  * discarded, then discard the symbol itself.
2483                  */
2484                 if (((sdflags & FLG_SY_SPECSEC) == 0) &&
2485                     (nsym->st_shndx != SHN_UNDEF)) {
2486                         Is_desc *isp;
2487 
2488                         if (shndx >= ifl->ifl_shnum) {
2489                                 /*
2490                                  * Carry our some basic sanity checks
2491                                  * The symbol will not be carried forward to
2492                                  * the output file, which won't be a problem
2493                                  * unless a relocation is required against it.
2494                                  */
2495                                 ld_eprintf(ofl, ERR_WARNING,
2496                                     MSG_INTL(MSG_SYM_INVSHNDX),
2497                                     demangle_symname(name, symsecname, ndx),
2498                                     ifl->ifl_name,
2499                                     conv_sym_shndx(osabi, mach, nsym->st_shndx,
2500                                     CONV_FMT_DECIMAL, &inv_buf));
2501                                 continue;
2502                         }
2503 
2504                         isp = ifl->ifl_isdesc[shndx];
2505                         if (isp && (isp->is_flags & FLG_IS_DISCARD)) {
2506                                 if ((sdp =
2507                                     libld_calloc(sizeof (Sym_desc), 1)) == NULL)
2508                                         return (S_ERROR);
2509 
2510                                 /*
2511                                  * Create a dummy symbol entry so that if we
2512                                  * find any references to this discarded symbol
2513                                  * we can compensate.
2514                                  */
2515                                 sdp->sd_name = name;
2516                                 sdp->sd_sym = nsym;
2517                                 sdp->sd_file = ifl;
2518                                 sdp->sd_isc = isp;
2519                                 sdp->sd_flags = FLG_SY_ISDISC;
2520                                 ifl->ifl_oldndx[ndx] = sdp;
2521 
2522                                 DBG_CALL(Dbg_syms_discarded(ofl->ofl_lml, sdp));
2523                                 continue;
2524                         }
2525                 }
2526 
2527                 /*
2528                  * If object capabilities for this file are being converted
2529                  * into symbol capabilities, then:
2530                  *
2531                  *  -   Any global function, or initialized global data symbol
2532                  *      definitions (ie., those that are not associated with
2533                  *      special symbol types, ie., ABS, COMMON, etc.), and which
2534                  *      have not been reduced to locals, are converted to symbol
2535                  *      references (UNDEF).  This ensures that any reference to
2536                  *      the original symbol, for example from a relocation, get
2537                  *      associated to a capabilities family lead symbol, ie., a
2538                  *      generic instance.
2539                  *
2540                  *  -   For each global function, or object symbol definition,
2541                  *      a new local symbol is created.  The function or object
2542                  *      is renamed using the capabilities CA_SUNW_ID definition
2543                  *      (which might have been fabricated for this purpose -
2544                  *      see get_cap_group()).  The new symbol name is:
2545                  *
2546                  *          <original name>%<capability group identifier>
2547                  *
2548                  *      This symbol is associated to the same location, and
2549                  *      becomes a capabilities family member.
2550                  */
2551                 /* LINTED */
2552                 hash = (Word)elf_hash(name);
2553 
2554                 ntype = ELF_ST_TYPE(nsym->st_info);
2555                 if (cdp && (nsym->st_shndx != SHN_UNDEF) &&
2556                     ((sdflags & FLG_SY_SPECSEC) == 0) &&
2557                     ((ntype == STT_FUNC) || (ntype == STT_OBJECT))) {
2558                         /*
2559                          * Determine this symbol's visibility.  If a mapfile has
2560                          * indicated this symbol should be local, then there's
2561                          * no point in transforming this global symbol to a
2562                          * capabilities symbol.  Otherwise, create a symbol
2563                          * capability pair descriptor to record this symbol as
2564                          * a candidate for translation.
2565                          */
2566                         if (sym_cap_vis(name, hash, sym, ofl) &&
2567                             ((cpp = alist_append(&cappairs, NULL,
2568                             sizeof (Cap_pair), AL_CNT_CAP_PAIRS)) == NULL))
2569                                 return (S_ERROR);
2570                 }
2571 
2572                 if (cpp) {
2573                         Sym     *rsym;
2574 
2575                         DBG_CALL(Dbg_syms_cap_convert(ofl, ndx, name, nsym));
2576 
2577                         /*
2578                          * Allocate a new symbol descriptor to represent the
2579                          * transformed global symbol.  The descriptor points
2580                          * to the original symbol information (which might
2581                          * indicate a global or weak visibility).  The symbol
2582                          * information will be transformed into a local symbol
2583                          * later, after any weak aliases are culled.
2584                          */
2585                         if ((cpp->c_osdp =
2586                             libld_malloc(sizeof (Sym_desc))) == NULL)
2587                                 return (S_ERROR);
2588 
2589                         cpp->c_osdp->sd_name = name;
2590                         cpp->c_osdp->sd_sym = nsym;
2591                         cpp->c_osdp->sd_shndx = shndx;
2592                         cpp->c_osdp->sd_file = ifl;
2593                         cpp->c_osdp->sd_isc = ifl->ifl_isdesc[shndx];
2594                         cpp->c_osdp->sd_ref = REF_REL_NEED;
2595 
2596                         /*
2597                          * Save the capabilities group this symbol belongs to,
2598                          * and the original symbol index.
2599                          */
2600                         cpp->c_group = cdp->ca_groups->apl_data[0];
2601                         cpp->c_ndx = ndx;
2602 
2603                         /*
2604                          * Replace the original symbol definition with a symbol
2605                          * reference.  Make sure this reference isn't left as a
2606                          * weak.
2607                          */
2608                         if ((rsym = libld_malloc(sizeof (Sym))) == NULL)
2609                                 return (S_ERROR);
2610 
2611                         *rsym = *nsym;
2612 
2613                         rsym->st_info = ELF_ST_INFO(STB_GLOBAL, ntype);
2614                         rsym->st_shndx = shndx = SHN_UNDEF;
2615                         rsym->st_value = 0;
2616                         rsym->st_size = 0;
2617 
2618                         sdflags |= FLG_SY_CAP;
2619 
2620                         nsym = rsym;
2621                 }
2622 
2623                 /*
2624                  * If the symbol does not already exist in the internal symbol
2625                  * table add it, otherwise resolve the conflict.  If the symbol
2626                  * from this file is kept, retain its symbol table index for
2627                  * possible use in associating a global alias.
2628                  */
2629                 if ((sdp = ld_sym_find(name, hash, &where, ofl)) == NULL) {
2630                         DBG_CALL(Dbg_syms_global(ofl->ofl_lml, ndx, name));
2631                         if ((sdp = ld_sym_enter(name, nsym, hash, ifl, ofl, ndx,
2632                             shndx, sdflags, &where)) == (Sym_desc *)S_ERROR)
2633                                 return (S_ERROR);
2634 
2635                 } else if (ld_sym_resolve(sdp, nsym, ifl, ofl, ndx, shndx,
2636                     sdflags) == S_ERROR)
2637                         return (S_ERROR);
2638 
2639                 /*
2640                  * Now that we have a symbol descriptor, retain the descriptor
2641                  * for later use by symbol capabilities processing.
2642                  */
2643                 if (cpp)
2644                         cpp->c_nsdp = sdp;
2645 
2646                 /*
2647                  * After we've compared a defined symbol in one shared
2648                  * object, flag the symbol so we don't compare it again.
2649                  */
2650                 if ((etype == ET_DYN) && (nsym->st_shndx != SHN_UNDEF) &&
2651                     ((sdp->sd_flags & FLG_SY_SOFOUND) == 0))
2652                         sdp->sd_flags |= FLG_SY_SOFOUND;
2653 
2654                 /*
2655                  * If the symbol is accepted from this file retain the symbol
2656                  * index for possible use in aliasing.
2657                  */
2658                 if (sdp->sd_file == ifl)
2659                         sdp->sd_symndx = ndx;
2660 
2661                 ifl->ifl_oldndx[ndx] = sdp;
2662 
2663                 /*
2664                  * If we've accepted a register symbol, continue to validate
2665                  * it.
2666                  */
2667                 if (sdp->sd_flags & FLG_SY_REGSYM) {
2668                         Sym_desc        *rsdp;
2669 
2670                         /*
2671                          * The presence of FLG_SY_REGSYM means that
2672                          * the pointers in ld_targ.t_ms are non-NULL.
2673                          */
2674                         rsdp = (*ld_targ.t_ms.ms_reg_find)(sdp->sd_sym, ofl);
2675                         if (rsdp == NULL) {
2676                                 if ((*ld_targ.t_ms.ms_reg_enter)(sdp, ofl) == 0)
2677                                         return (S_ERROR);
2678                         } else if (rsdp != sdp) {
2679                                 (void) (*ld_targ.t_ms.ms_reg_check)(rsdp,
2680                                     sdp->sd_sym, sdp->sd_name, ifl, ofl);
2681                         }
2682                 }
2683 
2684                 /*
2685                  * For a relocatable object, if this symbol is defined
2686                  * and has non-zero length and references an address
2687                  * within an associated section, then check its extents
2688                  * to make sure the section boundaries encompass it.
2689                  * If they don't, the ELF file is corrupt. Note that this
2690                  * global symbol may have come from another file to satisfy
2691                  * an UNDEF symbol of the same name from this one. In that
2692                  * case, we don't check it, because it was already checked
2693                  * as part of its own file.
2694                  */
2695                 if (etype_rel && (sdp->sd_file == ifl)) {
2696                         Sym *tsym = sdp->sd_sym;
2697 
2698                         if (SYM_LOC_BADADDR(sdp, tsym,
2699                             ELF_ST_TYPE(tsym->st_info))) {
2700                                 issue_badaddr_msg(ifl, ofl, sdp,
2701                                     tsym, tsym->st_shndx);
2702                                 continue;
2703                         }
2704                 }
2705         }
2706         DBG_CALL(Dbg_util_nl(ofl->ofl_lml, DBG_NL_STD));
2707 
2708         /*
2709          * Associate weak (alias) symbols to their non-weak counterparts by
2710          * scanning the global symbols one more time.
2711          *
2712          * This association is needed when processing the symbols from a shared
2713          * object dependency when a a weak definition satisfies a reference:
2714          *
2715          *  -   When building a dynamic executable, if a referenced symbol is a
2716          *      data item, the symbol data is copied to the executables address
2717          *      space.  In this copy-relocation case, we must also reassociate
2718          *      the alias symbol with its new location in the executable.
2719          *
2720          *  -   If the referenced symbol is a function then we may need to
2721          *      promote the symbols binding from undefined weak to undefined,
2722          *      otherwise the run-time linker will not generate the correct
2723          *      relocation error should the symbol not be found.
2724          *
2725          * Weak alias association is also required when a local dynsym table
2726          * is being created.  This table should only contain one instance of a
2727          * symbol that is associated to a given address.
2728          *
2729          * The true association between a weak/strong symbol pair is that both
2730          * symbol entries are identical, thus first we create a sorted symbol
2731          * list keyed off of the symbols section index and value.  If the symbol
2732          * belongs to the same section and has the same value, then the chances
2733          * are that the rest of the symbols data is the same.  This list is then
2734          * scanned for weak symbols, and if one is found then any strong
2735          * association will exist in the entries that follow.  Thus we just have
2736          * to scan one (typically a single alias) or more (in the uncommon
2737          * instance of multiple weak to strong associations) entries to
2738          * determine if a match exists.
2739          */
2740         if (weak && (OFL_ALLOW_LDYNSYM(ofl) || (etype == ET_DYN)) &&
2741             (total > local)) {
2742                 static Sym_desc **sort;
2743                 static size_t   osize = 0;
2744                 size_t          nsize = (total - local) * sizeof (Sym_desc *);
2745 
2746                 /*
2747                  * As we might be processing many input files, and many symbols,
2748                  * try and reuse a static sort buffer.  Note, presently we're
2749                  * playing the game of never freeing any buffers as there's a
2750                  * belief this wastes time.
2751                  */
2752                 if ((osize == 0) || (nsize > osize)) {
2753                         if ((sort = libld_malloc(nsize)) == NULL)
2754                                 return (S_ERROR);
2755                         osize = nsize;
2756                 }
2757                 (void) memcpy((void *)sort, &ifl->ifl_oldndx[local], nsize);
2758 
2759                 qsort(sort, (total - local), sizeof (Sym_desc *), compare);
2760 
2761                 for (ndx = 0; ndx < (total - local); ndx++) {
2762                         Sym_desc        *wsdp = sort[ndx];
2763                         Sym             *wsym;
2764                         int             sndx;
2765 
2766                         /*
2767                          * Ignore any empty symbol descriptor, or the case where
2768                          * the symbol has been resolved to a different file.
2769                          */
2770                         if ((wsdp == NULL) || (wsdp->sd_file != ifl))
2771                                 continue;
2772 
2773                         wsym = wsdp->sd_sym;
2774 
2775                         if ((wsym->st_shndx == SHN_UNDEF) ||
2776                             (wsdp->sd_flags & FLG_SY_SPECSEC) ||
2777                             (ELF_ST_BIND(wsym->st_info) != STB_WEAK))
2778                                 continue;
2779 
2780                         /*
2781                          * We have a weak symbol, if it has a strong alias it
2782                          * will have been sorted to one of the following sort
2783                          * table entries.  Note that we could have multiple weak
2784                          * symbols aliased to one strong (if this occurs then
2785                          * the strong symbol only maintains one alias back to
2786                          * the last weak).
2787                          */
2788                         for (sndx = ndx + 1; sndx < (total - local); sndx++) {
2789                                 Sym_desc        *ssdp = sort[sndx];
2790                                 Sym             *ssym;
2791                                 sd_flag_t       w_dynbits, s_dynbits;
2792 
2793                                 /*
2794                                  * Ignore any empty symbol descriptor, or the
2795                                  * case where the symbol has been resolved to a
2796                                  * different file.
2797                                  */
2798                                 if ((ssdp == NULL) || (ssdp->sd_file != ifl))
2799                                         continue;
2800 
2801                                 ssym = ssdp->sd_sym;
2802 
2803                                 if (ssym->st_shndx == SHN_UNDEF)
2804                                         continue;
2805 
2806                                 if ((ssym->st_shndx != wsym->st_shndx) ||
2807                                     (ssym->st_value != wsym->st_value))
2808                                         break;
2809 
2810                                 if ((ssym->st_size != wsym->st_size) ||
2811                                     (ssdp->sd_flags & FLG_SY_SPECSEC) ||
2812                                     (ELF_ST_BIND(ssym->st_info) == STB_WEAK))
2813                                         continue;
2814 
2815                                 /*
2816                                  * If a sharable object, set link fields so
2817                                  * that they reference each other.`
2818                                  */
2819                                 if (etype == ET_DYN) {
2820                                         ssdp->sd_aux->sa_linkndx =
2821                                             (Word)wsdp->sd_symndx;
2822                                         wsdp->sd_aux->sa_linkndx =
2823                                             (Word)ssdp->sd_symndx;
2824                                 }
2825 
2826                                 /*
2827                                  * Determine which of these two symbols go into
2828                                  * the sort section.  If a mapfile has made
2829                                  * explicit settings of the FLG_SY_*DYNSORT
2830                                  * flags for both symbols, then we do what they
2831                                  * say.  If one has the DYNSORT flags set, we
2832                                  * set the NODYNSORT bit in the other.  And if
2833                                  * neither has an explicit setting, then we
2834                                  * favor the weak symbol because they usually
2835                                  * lack the leading underscore.
2836                                  */
2837                                 w_dynbits = wsdp->sd_flags &
2838                                     (FLG_SY_DYNSORT | FLG_SY_NODYNSORT);
2839                                 s_dynbits = ssdp->sd_flags &
2840                                     (FLG_SY_DYNSORT | FLG_SY_NODYNSORT);
2841                                 if (!(w_dynbits && s_dynbits)) {
2842                                         if (s_dynbits) {
2843                                                 if (s_dynbits == FLG_SY_DYNSORT)
2844                                                         wsdp->sd_flags |=
2845                                                             FLG_SY_NODYNSORT;
2846                                         } else if (w_dynbits !=
2847                                             FLG_SY_NODYNSORT) {
2848                                                 ssdp->sd_flags |=
2849                                                     FLG_SY_NODYNSORT;
2850                                         }
2851                                 }
2852                                 break;
2853                         }
2854                 }
2855         }
2856 
2857         /*
2858          * Having processed all symbols, under -z symbolcap, reprocess any
2859          * symbols that are being translated from global to locals.  The symbol
2860          * pair that has been collected defines the original symbol (c_osdp),
2861          * which will become a local, and the new symbol (c_nsdp), which will
2862          * become a reference (UNDEF) for the original.
2863          *
2864          * Scan these symbol pairs looking for weak symbols, which have non-weak
2865          * aliases.  There is no need to translate both of these symbols to
2866          * locals, only the global is necessary.
2867          */
2868         if (cappairs) {
2869                 Aliste          idx1;
2870                 Cap_pair        *cpp1;
2871 
2872                 for (ALIST_TRAVERSE(cappairs, idx1, cpp1)) {
2873                         Sym_desc        *sdp1 = cpp1->c_osdp;
2874                         Sym             *sym1 = sdp1->sd_sym;
2875                         uchar_t         bind1 = ELF_ST_BIND(sym1->st_info);
2876                         Aliste          idx2;
2877                         Cap_pair        *cpp2;
2878 
2879                         /*
2880                          * If this symbol isn't weak, it's capability member is
2881                          * retained for the creation of a local symbol.
2882                          */
2883                         if (bind1 != STB_WEAK)
2884                                 continue;
2885 
2886                         /*
2887                          * If this is a weak symbol, traverse the capabilities
2888                          * list again to determine if a corresponding non-weak
2889                          * symbol exists.
2890                          */
2891                         for (ALIST_TRAVERSE(cappairs, idx2, cpp2)) {
2892                                 Sym_desc        *sdp2 = cpp2->c_osdp;
2893                                 Sym             *sym2 = sdp2->sd_sym;
2894                                 uchar_t         bind2 =
2895                                     ELF_ST_BIND(sym2->st_info);
2896 
2897                                 if ((cpp1 == cpp2) ||
2898                                     (cpp1->c_group != cpp2->c_group) ||
2899                                     (sym1->st_value != sym2->st_value) ||
2900                                     (bind2 == STB_WEAK))
2901                                         continue;
2902 
2903                                 /*
2904                                  * The weak symbol (sym1) has a non-weak (sym2)
2905                                  * counterpart.  There's no point in translating
2906                                  * both of these equivalent symbols to locals.
2907                                  * Add this symbol capability alias to the
2908                                  * capabilities family information, and remove
2909                                  * the weak symbol.
2910                                  */
2911                                 if (ld_cap_add_family(ofl, cpp2->c_nsdp,
2912                                     cpp1->c_nsdp, NULL, NULL) == S_ERROR)
2913                                         return (S_ERROR);
2914 
2915                                 free((void *)cpp1->c_osdp);
2916                                 (void) alist_delete(cappairs, &idx1);
2917                         }
2918                 }
2919 
2920                 DBG_CALL(Dbg_util_nl(ofl->ofl_lml, DBG_NL_STD));
2921 
2922                 /*
2923                  * The capability pairs information now represents all the
2924                  * global symbols that need transforming to locals.  These
2925                  * local symbols are renamed using their group identifiers.
2926                  */
2927                 for (ALIST_TRAVERSE(cappairs, idx1, cpp1)) {
2928                         Sym_desc        *osdp = cpp1->c_osdp;
2929                         Objcapset       *capset;
2930                         size_t          nsize, tsize;
2931                         const char      *oname;
2932                         char            *cname, *idstr;
2933                         Sym             *csym;
2934 
2935                         /*
2936                          * If the local symbol has not yet been translated
2937                          * convert it to a local symbol with a name.
2938                          */
2939                         if ((osdp->sd_flags & FLG_SY_CAP) != 0)
2940                                 continue;
2941 
2942                         /*
2943                          * As we're converting object capabilities to symbol
2944                          * capabilities, obtain the capabilities set for this
2945                          * object, so as to retrieve the CA_SUNW_ID value.
2946                          */
2947                         capset = &cpp1->c_group->cg_set;
2948 
2949                         /*
2950                          * Create a new name from the existing symbol and the
2951                          * capabilities group identifier.  Note, the delimiter
2952                          * between the symbol name and identifier name is hard-
2953                          * coded here (%), so that we establish a convention
2954                          * for transformed symbol names.
2955                          */
2956                         oname = osdp->sd_name;
2957 
2958                         idstr = capset->oc_id.cs_str;
2959                         nsize = strlen(oname);
2960                         tsize = nsize + 1 + strlen(idstr) + 1;
2961                         if ((cname = libld_malloc(tsize)) == 0)
2962                                 return (S_ERROR);
2963 
2964                         (void) strcpy(cname, oname);
2965                         cname[nsize++] = '%';
2966                         (void) strcpy(&cname[nsize], idstr);
2967 
2968                         /*
2969                          * Allocate a new symbol table entry, transform this
2970                          * symbol to a local, and assign the new name.
2971                          */
2972                         if ((csym = libld_malloc(sizeof (Sym))) == NULL)
2973                                 return (S_ERROR);
2974 
2975                         *csym = *osdp->sd_sym;
2976                         csym->st_info = ELF_ST_INFO(STB_LOCAL,
2977                             ELF_ST_TYPE(osdp->sd_sym->st_info));
2978 
2979                         osdp->sd_name = cname;
2980                         osdp->sd_sym = csym;
2981                         osdp->sd_flags = FLG_SY_CAP;
2982 
2983                         /*
2984                          * Keep track of this new local symbol.  As -z symbolcap
2985                          * can only be used to create a relocatable object, a
2986                          * dynamic symbol table can't exist.  Ensure there is
2987                          * space reserved in the string table.
2988                          */
2989                         ofl->ofl_caploclcnt++;
2990                         if (st_insert(ofl->ofl_strtab, cname) == -1)
2991                                 return (S_ERROR);
2992 
2993                         DBG_CALL(Dbg_syms_cap_local(ofl, cpp1->c_ndx,
2994                             cname, csym, osdp));
2995 
2996                         /*
2997                          * Establish this capability pair as a family.
2998                          */
2999                         if (ld_cap_add_family(ofl, cpp1->c_nsdp, osdp,
3000                             cpp1->c_group, &ifl->ifl_caps->ca_syms) == S_ERROR)
3001                                 return (S_ERROR);
3002                 }
3003         }
3004 
3005         return (1);
3006 
3007 #undef SYM_LOC_BADADDR
3008 }
3009 
3010 /*
3011  * Add an undefined symbol to the symbol table.  The reference originates from
3012  * the location identified by the message id (mid).  These references can
3013  * originate from command line options such as -e, -u, -initarray, etc.
3014  * (identified with MSG_INTL(MSG_STR_COMMAND)), or from internally generated
3015  * TLS relocation references (identified with MSG_INTL(MSG_STR_TLSREL)).
3016  */
3017 Sym_desc *
3018 ld_sym_add_u(const char *name, Ofl_desc *ofl, Msg mid)
3019 {
3020         Sym             *sym;
3021         Ifl_desc        *ifl = NULL, *_ifl;
3022         Sym_desc        *sdp;
3023         Word            hash;
3024         Aliste          idx;
3025         avl_index_t     where;
3026         const char      *reference = MSG_INTL(mid);
3027 
3028         /*
3029          * As an optimization, determine whether we've already generated this
3030          * reference.  If the symbol doesn't already exist we'll create it.
3031          * Or if the symbol does exist from a different source, we'll resolve
3032          * the conflict.
3033          */
3034         /* LINTED */
3035         hash = (Word)elf_hash(name);
3036         if ((sdp = ld_sym_find(name, hash, &where, ofl)) != NULL) {
3037                 if ((sdp->sd_sym->st_shndx == SHN_UNDEF) &&
3038                     (sdp->sd_file->ifl_name == reference))
3039                         return (sdp);
3040         }
3041 
3042         /*
3043          * Determine whether a pseudo input file descriptor exists to represent
3044          * the command line, as any global symbol needs an input file descriptor
3045          * during any symbol resolution (refer to map_ifl() which provides a
3046          * similar method for adding symbols from mapfiles).
3047          */
3048         for (APLIST_TRAVERSE(ofl->ofl_objs, idx, _ifl))
3049                 if (strcmp(_ifl->ifl_name, reference) == 0) {
3050                         ifl = _ifl;
3051                         break;
3052                 }
3053 
3054         /*
3055          * If no descriptor exists create one.
3056          */
3057         if (ifl == NULL) {
3058                 if ((ifl = libld_calloc(sizeof (Ifl_desc), 1)) == NULL)
3059                         return ((Sym_desc *)S_ERROR);
3060                 ifl->ifl_name = reference;
3061                 ifl->ifl_flags = FLG_IF_NEEDED | FLG_IF_FILEREF;
3062                 if ((ifl->ifl_ehdr = libld_calloc(sizeof (Ehdr), 1)) == NULL)
3063                         return ((Sym_desc *)S_ERROR);
3064                 ifl->ifl_ehdr->e_type = ET_REL;
3065 
3066                 if (aplist_append(&ofl->ofl_objs, ifl, AL_CNT_OFL_OBJS) == NULL)
3067                         return ((Sym_desc *)S_ERROR);
3068         }
3069 
3070         /*
3071          * Allocate a symbol structure and add it to the global symbol table.
3072          */
3073         if ((sym = libld_calloc(sizeof (Sym), 1)) == NULL)
3074                 return ((Sym_desc *)S_ERROR);
3075         sym->st_info = ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE);
3076         sym->st_shndx = SHN_UNDEF;
3077 
3078         DBG_CALL(Dbg_syms_process(ofl->ofl_lml, ifl));
3079         if (sdp == NULL) {
3080                 DBG_CALL(Dbg_syms_global(ofl->ofl_lml, 0, name));
3081                 if ((sdp = ld_sym_enter(name, sym, hash, ifl, ofl, 0, SHN_UNDEF,
3082                     0, &where)) == (Sym_desc *)S_ERROR)
3083                         return ((Sym_desc *)S_ERROR);
3084         } else if (ld_sym_resolve(sdp, sym, ifl, ofl, 0,
3085             SHN_UNDEF, 0) == S_ERROR)
3086                 return ((Sym_desc *)S_ERROR);
3087 
3088         sdp->sd_flags &= ~FLG_SY_CLEAN;
3089         sdp->sd_flags |= FLG_SY_CMDREF;
3090 
3091         return (sdp);
3092 }
3093 
3094 /*
3095  * STT_SECTION symbols have their st_name field set to NULL, and consequently
3096  * have no name. Generate a name suitable for diagnostic use for such a symbol
3097  * and store it in the input section descriptor. The resulting name will be
3098  * of the form:
3099  *
3100  *      "XXX (section)"
3101  *
3102  * where XXX is the name of the section.
3103  *
3104  * entry:
3105  *      isc - Input section associated with the symbol.
3106  *      fmt - NULL, or format string to use.
3107  *
3108  * exit:
3109  *      Sets isp->is_sym_name to the allocated string. Returns the
3110  *      string pointer, or NULL on allocation failure.
3111  */
3112 const const char *
3113 ld_stt_section_sym_name(Is_desc *isp)
3114 {
3115         const char      *fmt;
3116         char            *str;
3117         size_t          len;
3118 
3119         if ((isp == NULL) || (isp->is_name == NULL))
3120                 return (NULL);
3121 
3122         if (isp->is_sym_name == NULL) {
3123                 fmt = (isp->is_flags & FLG_IS_GNSTRMRG) ?
3124                     MSG_INTL(MSG_STR_SECTION_MSTR) : MSG_INTL(MSG_STR_SECTION);
3125 
3126                 len = strlen(fmt) + strlen(isp->is_name) + 1;
3127 
3128                 if ((str = libld_malloc(len)) == NULL)
3129                         return (NULL);
3130                 (void) snprintf(str, len, fmt, isp->is_name);
3131                 isp->is_sym_name = str;
3132         }
3133 
3134         return (isp->is_sym_name);
3135 }