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_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_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 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 }