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10366 ld(1) should support GNU-style linker sets
10581 ld(1) should know kernel modules are a thing
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--- old/usr/src/cmd/sgs/libld/common/syms.c
+++ new/usr/src/cmd/sgs/libld/common/syms.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 1988 AT&T
24 24 * All Rights Reserved
25 25 *
26 26 *
27 27 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
28 28 */
29 29
30 30 /*
31 31 * Symbol table management routines
32 32 */
33 33
34 34 #define ELF_TARGET_AMD64
35 35
36 36 #include <stdio.h>
37 37 #include <string.h>
38 38 #include <debug.h>
39 39 #include "msg.h"
40 40 #include "_libld.h"
41 41
42 42 /*
43 43 * AVL tree comparator function:
44 44 *
45 45 * The primary key is the symbol name hash with a secondary key of the symbol
46 46 * name itself.
47 47 */
48 48 int
49 49 ld_sym_avl_comp(const void *elem1, const void *elem2)
50 50 {
51 51 Sym_avlnode *sav1 = (Sym_avlnode *)elem1;
52 52 Sym_avlnode *sav2 = (Sym_avlnode *)elem2;
53 53 int res;
54 54
55 55 res = sav1->sav_hash - sav2->sav_hash;
56 56
57 57 if (res < 0)
58 58 return (-1);
59 59 if (res > 0)
60 60 return (1);
61 61
62 62 /*
63 63 * Hash is equal - now compare name
64 64 */
65 65 res = strcmp(sav1->sav_name, sav2->sav_name);
66 66 if (res == 0)
67 67 return (0);
68 68 if (res > 0)
69 69 return (1);
70 70 return (-1);
71 71 }
72 72
73 73 /*
74 74 * Focal point for verifying symbol names.
75 75 */
76 76 inline static const char *
77 77 string(Ofl_desc *ofl, Ifl_desc *ifl, Sym *sym, const char *strs, size_t strsize,
78 78 int symndx, Word shndx, Word symsecndx, const char *symsecname,
79 79 const char *strsecname, sd_flag_t *flags)
80 80 {
81 81 Word name = sym->st_name;
82 82
83 83 if (name) {
84 84 if ((ifl->ifl_flags & FLG_IF_HSTRTAB) == 0) {
85 85 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_FIL_NOSTRTABLE),
86 86 ifl->ifl_name, EC_WORD(symsecndx), symsecname,
87 87 symndx, EC_XWORD(name));
88 88 return (NULL);
89 89 }
90 90 if (name >= (Word)strsize) {
91 91 ld_eprintf(ofl, ERR_FATAL,
92 92 MSG_INTL(MSG_FIL_EXCSTRTABLE), ifl->ifl_name,
93 93 EC_WORD(symsecndx), symsecname, symndx,
94 94 EC_XWORD(name), strsecname, EC_XWORD(strsize));
95 95 return (NULL);
96 96 }
97 97 }
98 98
99 99 /*
100 100 * Determine if we're dealing with a register and if so validate it.
101 101 * If it's a scratch register, a fabricated name will be returned.
102 102 */
103 103 if (ld_targ.t_ms.ms_is_regsym != NULL) {
104 104 const char *regname = (*ld_targ.t_ms.ms_is_regsym)(ofl, ifl,
105 105 sym, strs, symndx, shndx, symsecname, flags);
106 106
107 107 if (regname == (const char *)S_ERROR) {
108 108 return (NULL);
109 109 }
110 110 if (regname)
111 111 return (regname);
112 112 }
113 113
114 114 /*
115 115 * If this isn't a register, but we have a global symbol with a null
116 116 * name, we're not going to be able to hash this, search for it, or
117 117 * do anything interesting. However, we've been accepting a symbol of
118 118 * this kind for ages now, so give the user a warning (rather than a
119 119 * fatal error), just in case this instance exists somewhere in the
120 120 * world and hasn't, as yet, been a problem.
121 121 */
122 122 if ((name == 0) && (ELF_ST_BIND(sym->st_info) != STB_LOCAL)) {
123 123 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_FIL_NONAMESYM),
124 124 ifl->ifl_name, EC_WORD(symsecndx), symsecname, symndx,
125 125 EC_XWORD(name));
126 126 }
127 127 return (strs + name);
128 128 }
129 129
130 130 /*
131 131 * For producing symbol names strings to use in error messages.
132 132 * If the symbol has a non-null name, then the string returned by
133 133 * this function is the output from demangle(), surrounded by
134 134 * single quotes. For null names, a descriptive string giving
135 135 * the symbol section and index is generated.
136 136 *
137 137 * This function uses an internal static buffer to hold the resulting
138 138 * string. The value returned is usable by the caller until the next
139 139 * call, at which point it is overwritten.
140 140 */
141 141 static const char *
142 142 demangle_symname(const char *name, const char *symtab_name, Word symndx)
143 143 {
144 144 #define INIT_BUFSIZE 256
145 145
146 146 static char *buf;
147 147 static size_t bufsize = 0;
148 148 size_t len;
149 149 int use_name;
150 150
151 151 use_name = (name != NULL) && (*name != '\0');
152 152
153 153 if (use_name) {
154 154 name = demangle(name);
155 155 len = strlen(name) + 2; /* Include room for quotes */
156 156 } else {
157 157 name = MSG_ORIG(MSG_STR_EMPTY);
158 158 len = strlen(symtab_name) + 2 + CONV_INV_BUFSIZE;
159 159 }
160 160 len++; /* Null termination */
161 161
162 162 /* If our buffer is too small, double it until it is big enough */
163 163 if (len > bufsize) {
164 164 size_t new_bufsize = bufsize;
165 165 char *new_buf;
166 166
167 167 if (new_bufsize == 0)
168 168 new_bufsize = INIT_BUFSIZE;
169 169 while (len > new_bufsize)
170 170 new_bufsize *= 2;
171 171 if ((new_buf = libld_malloc(new_bufsize)) == NULL)
172 172 return (name);
173 173 buf = new_buf;
174 174 bufsize = new_bufsize;
175 175 }
176 176
177 177 if (use_name) {
178 178 (void) snprintf(buf, bufsize, MSG_ORIG(MSG_FMT_SYMNAM), name);
179 179 } else {
180 180 (void) snprintf(buf, bufsize, MSG_ORIG(MSG_FMT_NULLSYMNAM),
181 181 symtab_name, EC_WORD(symndx));
182 182 }
183 183
184 184 return (buf);
185 185
186 186 #undef INIT_BUFSIZE
187 187 }
188 188
189 189 /*
190 190 * Shared objects can be built that define specific symbols that can not be
191 191 * directly bound to. These objects have a syminfo section (and an associated
192 192 * DF_1_NODIRECT dynamic flags entry). Scan this table looking for symbols
193 193 * that can't be bound to directly, and if this files symbol is presently
194 194 * referenced, mark it so that we don't directly bind to it.
195 195 */
196 196 uintptr_t
197 197 ld_sym_nodirect(Is_desc *isp, Ifl_desc *ifl, Ofl_desc *ofl)
198 198 {
199 199 Shdr *sifshdr, *symshdr;
200 200 Syminfo *sifdata;
201 201 Sym *symdata;
202 202 char *strdata;
203 203 ulong_t cnt, _cnt;
204 204
205 205 /*
206 206 * Get the syminfo data, and determine the number of entries.
207 207 */
208 208 sifshdr = isp->is_shdr;
209 209 sifdata = (Syminfo *)isp->is_indata->d_buf;
210 210 cnt = sifshdr->sh_size / sifshdr->sh_entsize;
211 211
212 212 /*
213 213 * Get the associated symbol table.
214 214 */
215 215 if ((sifshdr->sh_link == 0) || (sifshdr->sh_link >= ifl->ifl_shnum)) {
216 216 /*
217 217 * Broken input file
218 218 */
219 219 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_FIL_INVSHINFO),
220 220 ifl->ifl_name, isp->is_name, EC_XWORD(sifshdr->sh_link));
221 221 return (0);
222 222 }
223 223 symshdr = ifl->ifl_isdesc[sifshdr->sh_link]->is_shdr;
224 224 symdata = ifl->ifl_isdesc[sifshdr->sh_link]->is_indata->d_buf;
225 225
226 226 /*
227 227 * Get the string table associated with the symbol table.
228 228 */
229 229 strdata = ifl->ifl_isdesc[symshdr->sh_link]->is_indata->d_buf;
230 230
231 231 /*
232 232 * Traverse the syminfo data for symbols that can't be directly
233 233 * bound to.
234 234 */
235 235 for (_cnt = 1, sifdata++; _cnt < cnt; _cnt++, sifdata++) {
236 236 Sym *sym;
237 237 char *str;
238 238 Sym_desc *sdp;
239 239
240 240 if ((sifdata->si_flags & SYMINFO_FLG_NOEXTDIRECT) == 0)
241 241 continue;
242 242
243 243 sym = (Sym *)(symdata + _cnt);
244 244 str = (char *)(strdata + sym->st_name);
245 245
246 246 if ((sdp = ld_sym_find(str, SYM_NOHASH, NULL, ofl)) != NULL) {
247 247 if (ifl != sdp->sd_file)
248 248 continue;
249 249
250 250 sdp->sd_flags &= ~FLG_SY_DIR;
251 251 sdp->sd_flags |= FLG_SY_NDIR;
252 252 }
253 253 }
254 254 return (0);
255 255 }
256 256
257 257 /*
258 258 * If, during symbol processing, it is necessary to update a local symbols
259 259 * contents before we have generated the symbol tables in the output image,
260 260 * create a new symbol structure and copy the original symbol contents. While
261 261 * we are processing the input files, their local symbols are part of the
262 262 * read-only mapped image. Commonly, these symbols are copied to the new output
263 263 * file image and then updated to reflect their new address and any change in
264 264 * attributes. However, sometimes during relocation counting, it is necessary
265 265 * to adjust the symbols information. This routine provides for the generation
266 266 * of a new symbol image so that this update can be performed.
267 267 * All global symbols are copied to an internal symbol table to improve locality
268 268 * of reference and hence performance, and thus this copying is not necessary.
269 269 */
270 270 uintptr_t
271 271 ld_sym_copy(Sym_desc *sdp)
272 272 {
273 273 Sym *nsym;
274 274
275 275 if (sdp->sd_flags & FLG_SY_CLEAN) {
276 276 if ((nsym = libld_malloc(sizeof (Sym))) == NULL)
277 277 return (S_ERROR);
278 278 *nsym = *(sdp->sd_sym);
279 279 sdp->sd_sym = nsym;
280 280 sdp->sd_flags &= ~FLG_SY_CLEAN;
281 281 }
282 282 return (1);
283 283 }
284 284
285 285 /*
286 286 * Finds a given name in the link editors internal symbol table. If no
287 287 * hash value is specified it is calculated. A pointer to the located
288 288 * Sym_desc entry is returned, or NULL if the symbol is not found.
289 289 */
290 290 Sym_desc *
291 291 ld_sym_find(const char *name, Word hash, avl_index_t *where, Ofl_desc *ofl)
292 292 {
293 293 Sym_avlnode qsav, *sav;
294 294
295 295 if (hash == SYM_NOHASH)
296 296 /* LINTED */
297 297 hash = (Word)elf_hash((const char *)name);
298 298 qsav.sav_hash = hash;
299 299 qsav.sav_name = name;
300 300
301 301 /*
302 302 * Perform search for symbol in AVL tree. Note that the 'where' field
303 303 * is passed in from the caller. If a 'where' is present, it can be
304 304 * used in subsequent 'ld_sym_enter()' calls if required.
305 305 */
306 306 sav = avl_find(&ofl->ofl_symavl, &qsav, where);
307 307
308 308 /*
309 309 * If symbol was not found in the avl tree, return null to show that.
310 310 */
311 311 if (sav == NULL)
312 312 return (NULL);
313 313
314 314 /*
315 315 * Return symbol found.
316 316 */
317 317 return (sav->sav_sdp);
318 318 }
319 319
320 320 /*
321 321 * Enter a new symbol into the link editors internal symbol table.
322 322 * If the symbol is from an input file, information regarding the input file
323 323 * and input section is also recorded. Otherwise (file == NULL) the symbol
324 324 * has been internally generated (ie. _etext, _edata, etc.).
325 325 */
326 326 Sym_desc *
327 327 ld_sym_enter(const char *name, Sym *osym, Word hash, Ifl_desc *ifl,
328 328 Ofl_desc *ofl, Word ndx, Word shndx, sd_flag_t sdflags, avl_index_t *where)
329 329 {
330 330 Sym_desc *sdp;
331 331 Sym_aux *sap;
332 332 Sym_avlnode *savl;
333 333 char *_name;
334 334 Sym *nsym;
335 335 Half etype;
336 336 uchar_t vis;
337 337 avl_index_t _where;
338 338
339 339 /*
340 340 * Establish the file type.
341 341 */
342 342 if (ifl)
343 343 etype = ifl->ifl_ehdr->e_type;
344 344 else
345 345 etype = ET_NONE;
346 346
347 347 ofl->ofl_entercnt++;
348 348
349 349 /*
350 350 * Allocate a Sym Descriptor, Auxiliary Descriptor, and a Sym AVLNode -
351 351 * contiguously.
352 352 */
353 353 if ((savl = libld_calloc(S_DROUND(sizeof (Sym_avlnode)) +
354 354 S_DROUND(sizeof (Sym_desc)) +
355 355 S_DROUND(sizeof (Sym_aux)), 1)) == NULL)
356 356 return ((Sym_desc *)S_ERROR);
357 357 sdp = (Sym_desc *)((uintptr_t)savl +
358 358 S_DROUND(sizeof (Sym_avlnode)));
359 359 sap = (Sym_aux *)((uintptr_t)sdp +
360 360 S_DROUND(sizeof (Sym_desc)));
361 361
362 362 savl->sav_sdp = sdp;
363 363 sdp->sd_file = ifl;
364 364 sdp->sd_aux = sap;
365 365 savl->sav_hash = sap->sa_hash = hash;
366 366
367 367 /*
368 368 * Copy the symbol table entry from the input file into the internal
369 369 * entry and have the symbol descriptor use it.
370 370 */
371 371 sdp->sd_sym = nsym = &sap->sa_sym;
372 372 *nsym = *osym;
373 373 sdp->sd_shndx = shndx;
374 374 sdp->sd_flags |= sdflags;
375 375
376 376 if ((_name = libld_malloc(strlen(name) + 1)) == NULL)
377 377 return ((Sym_desc *)S_ERROR);
378 378 savl->sav_name = sdp->sd_name = (const char *)strcpy(_name, name);
379 379
380 380 /*
381 381 * Enter Symbol in AVL tree.
382 382 */
383 383 if (where == 0) {
384 384 /* LINTED */
385 385 Sym_avlnode *_savl;
386 386 /*
387 387 * If a previous ld_sym_find() hasn't initialized 'where' do it
388 388 * now.
389 389 */
390 390 where = &_where;
391 391 _savl = avl_find(&ofl->ofl_symavl, savl, where);
392 392 assert(_savl == NULL);
393 393 }
394 394 avl_insert(&ofl->ofl_symavl, savl, *where);
395 395
396 396 /*
397 397 * Record the section index. This is possible because the
398 398 * `ifl_isdesc' table is filled before we start symbol processing.
399 399 */
400 400 if ((sdflags & FLG_SY_SPECSEC) || (nsym->st_shndx == SHN_UNDEF))
401 401 sdp->sd_isc = NULL;
402 402 else {
403 403 sdp->sd_isc = ifl->ifl_isdesc[shndx];
404 404
405 405 /*
406 406 * If this symbol is from a relocatable object, make sure that
407 407 * it is still associated with a section. For example, an
408 408 * unknown section type (SHT_NULL) would have been rejected on
409 409 * input with a warning. Here, we make the use of the symbol
410 410 * fatal. A symbol descriptor is still returned, so that the
411 411 * caller can continue processing all symbols, and hence flush
412 412 * out as many error conditions as possible.
413 413 */
414 414 if ((etype == ET_REL) && (sdp->sd_isc == NULL)) {
415 415 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_SYM_INVSEC),
416 416 name, ifl->ifl_name, EC_XWORD(shndx));
417 417 return (sdp);
418 418 }
419 419 }
420 420
421 421 /*
422 422 * Mark any COMMON symbols as 'tentative'.
423 423 */
424 424 if (sdflags & FLG_SY_SPECSEC) {
425 425 if (nsym->st_shndx == SHN_COMMON)
426 426 sdp->sd_flags |= FLG_SY_TENTSYM;
427 427 #if defined(_ELF64)
428 428 else if ((ld_targ.t_m.m_mach == EM_AMD64) &&
429 429 (nsym->st_shndx == SHN_X86_64_LCOMMON))
430 430 sdp->sd_flags |= FLG_SY_TENTSYM;
431 431 #endif
432 432 }
433 433
434 434 /*
435 435 * Establish the symbols visibility and reference.
436 436 */
437 437 vis = ELF_ST_VISIBILITY(nsym->st_other);
438 438
439 439 if ((etype == ET_NONE) || (etype == ET_REL)) {
440 440 switch (vis) {
441 441 case STV_DEFAULT:
442 442 sdp->sd_flags |= FLG_SY_DEFAULT;
443 443 break;
444 444 case STV_INTERNAL:
445 445 case STV_HIDDEN:
446 446 sdp->sd_flags |= FLG_SY_HIDDEN;
447 447 break;
448 448 case STV_PROTECTED:
449 449 sdp->sd_flags |= FLG_SY_PROTECT;
450 450 break;
451 451 case STV_EXPORTED:
452 452 sdp->sd_flags |= FLG_SY_EXPORT;
453 453 break;
454 454 case STV_SINGLETON:
455 455 sdp->sd_flags |= (FLG_SY_SINGLE | FLG_SY_NDIR);
456 456 ofl->ofl_flags1 |= (FLG_OF1_NDIRECT | FLG_OF1_NGLBDIR);
457 457 break;
458 458 case STV_ELIMINATE:
459 459 sdp->sd_flags |= (FLG_SY_HIDDEN | FLG_SY_ELIM);
460 460 break;
461 461 default:
462 462 assert(vis <= STV_ELIMINATE);
463 463 }
464 464
465 465 sdp->sd_ref = REF_REL_NEED;
466 466
467 467 /*
468 468 * Under -Bnodirect, all exported interfaces that have not
469 469 * explicitly been defined protected or directly bound to, are
470 470 * tagged to prevent direct binding.
471 471 */
472 472 if ((ofl->ofl_flags1 & FLG_OF1_ALNODIR) &&
473 473 ((sdp->sd_flags & (FLG_SY_PROTECT | FLG_SY_DIR)) == 0) &&
474 474 (nsym->st_shndx != SHN_UNDEF)) {
475 475 sdp->sd_flags |= FLG_SY_NDIR;
476 476 }
477 477 } else {
478 478 sdp->sd_ref = REF_DYN_SEEN;
479 479
480 480 /*
481 481 * If this is a protected symbol, remember this. Note, this
482 482 * state is different from the FLG_SY_PROTECT used to establish
483 483 * a symbol definitions visibility. This state is used to warn
484 484 * against possible copy relocations against this referenced
485 485 * symbol.
486 486 */
487 487 if (vis == STV_PROTECTED)
488 488 sdp->sd_flags |= FLG_SY_PROT;
489 489
490 490 /*
491 491 * If this is a SINGLETON definition, then indicate the symbol
492 492 * can not be directly bound to, and retain the visibility.
493 493 * This visibility will be inherited by any references made to
494 494 * this symbol.
495 495 */
496 496 if ((vis == STV_SINGLETON) && (nsym->st_shndx != SHN_UNDEF))
497 497 sdp->sd_flags |= (FLG_SY_SINGLE | FLG_SY_NDIR);
498 498
499 499 /*
500 500 * If the new symbol is from a shared library and is associated
501 501 * with a SHT_NOBITS section then this symbol originated from a
502 502 * tentative symbol.
503 503 */
504 504 if (sdp->sd_isc &&
505 505 (sdp->sd_isc->is_shdr->sh_type == SHT_NOBITS))
506 506 sdp->sd_flags |= FLG_SY_TENTSYM;
507 507 }
508 508
509 509 /*
510 510 * Reclassify any SHN_SUNW_IGNORE symbols to SHN_UNDEF so as to
511 511 * simplify future processing.
512 512 */
513 513 if (nsym->st_shndx == SHN_SUNW_IGNORE) {
514 514 sdp->sd_shndx = shndx = SHN_UNDEF;
515 515 sdp->sd_flags |= (FLG_SY_REDUCED |
516 516 FLG_SY_HIDDEN | FLG_SY_IGNORE | FLG_SY_ELIM);
517 517 }
518 518
519 519 /*
520 520 * If this is an undefined, or common symbol from a relocatable object
521 521 * determine whether it is a global or weak reference (see build_osym(),
522 522 * where REF_DYN_NEED definitions are returned back to undefines).
523 523 */
524 524 if ((etype == ET_REL) &&
525 525 (ELF_ST_BIND(nsym->st_info) == STB_GLOBAL) &&
526 526 ((nsym->st_shndx == SHN_UNDEF) || ((sdflags & FLG_SY_SPECSEC) &&
527 527 #if defined(_ELF64)
528 528 ((nsym->st_shndx == SHN_COMMON) ||
529 529 ((ld_targ.t_m.m_mach == EM_AMD64) &&
530 530 (nsym->st_shndx == SHN_X86_64_LCOMMON))))))
531 531 #else
532 532 /* BEGIN CSTYLED */
533 533 (nsym->st_shndx == SHN_COMMON))))
534 534 /* END CSTYLED */
535 535 #endif
536 536 sdp->sd_flags |= FLG_SY_GLOBREF;
537 537
538 538 /*
539 539 * Record the input filename on the referenced or defined files list
540 540 * for possible later diagnostics. The `sa_rfile' pointer contains the
541 541 * name of the file that first referenced this symbol and is used to
542 542 * generate undefined symbol diagnostics (refer to sym_undef_entry()).
543 543 * Note that this entry can be overridden if a reference from a
544 544 * relocatable object is found after a reference from a shared object
545 545 * (refer to sym_override()).
546 546 * The `sa_dfiles' list is used to maintain the list of files that
547 547 * define the same symbol. This list can be used for two reasons:
548 548 *
549 549 * - To save the first definition of a symbol that is not available
550 550 * for this link-edit.
551 551 *
552 552 * - To save all definitions of a symbol when the -m option is in
553 553 * effect. This is optional as it is used to list multiple
554 554 * (interposed) definitions of a symbol (refer to ldmap_out()),
555 555 * and can be quite expensive.
556 556 */
557 557 if (nsym->st_shndx == SHN_UNDEF) {
558 558 sap->sa_rfile = ifl->ifl_name;
559 559 } else {
560 560 if (sdp->sd_ref == REF_DYN_SEEN) {
561 561 /*
562 562 * A symbol is determined to be unavailable if it
563 563 * belongs to a version of a shared object that this
564 564 * user does not wish to use, or if it belongs to an
565 565 * implicit shared object.
566 566 */
567 567 if (ifl->ifl_vercnt) {
568 568 Ver_index *vip;
569 569 Half vndx = ifl->ifl_versym[ndx];
570 570
571 571 sap->sa_dverndx = vndx;
572 572 vip = &ifl->ifl_verndx[vndx];
573 573 if (!(vip->vi_flags & FLG_VER_AVAIL)) {
574 574 sdp->sd_flags |= FLG_SY_NOTAVAIL;
575 575 sap->sa_vfile = ifl->ifl_name;
576 576 }
577 577 }
578 578 if (!(ifl->ifl_flags & FLG_IF_NEEDED))
579 579 sdp->sd_flags |= FLG_SY_NOTAVAIL;
580 580
581 581 } else if (etype == ET_REL) {
582 582 /*
583 583 * If this symbol has been obtained from a versioned
584 584 * input relocatable object then the new symbol must be
585 585 * promoted to the versioning of the output file.
586 586 */
587 587 if (ifl->ifl_versym)
588 588 ld_vers_promote(sdp, ndx, ifl, ofl);
589 589 }
590 590
591 591 if ((ofl->ofl_flags & FLG_OF_GENMAP) &&
592 592 ((sdflags & FLG_SY_SPECSEC) == 0))
593 593 if (aplist_append(&sap->sa_dfiles, ifl->ifl_name,
594 594 AL_CNT_SDP_DFILES) == NULL)
595 595 return ((Sym_desc *)S_ERROR);
596 596 }
597 597
598 598 /*
599 599 * Provided we're not processing a mapfile, diagnose the entered symbol.
600 600 * Mapfile processing requires the symbol to be updated with additional
601 601 * information, therefore the diagnosing of the symbol is deferred until
602 602 * later (see Dbg_map_symbol()).
603 603 */
604 604 if ((ifl == NULL) || ((ifl->ifl_flags & FLG_IF_MAPFILE) == 0))
605 605 DBG_CALL(Dbg_syms_entered(ofl, nsym, sdp));
606 606
607 607 return (sdp);
608 608 }
609 609
610 610 /*
611 611 * Add a special symbol to the symbol table. Takes special symbol name with
612 612 * and without underscores. This routine is called, after all other symbol
613 613 * resolution has completed, to generate a reserved absolute symbol (the
614 614 * underscore version). Special symbols are updated with the appropriate
615 615 * values in update_osym(). If the user has already defined this symbol
616 616 * issue a warning and leave the symbol as is. If the non-underscore symbol
617 617 * is referenced then turn it into a weak alias of the underscored symbol.
618 618 *
619 619 * The bits in sdflags_u are OR'd into the flags field of the symbol for the
620 620 * underscored symbol.
621 621 *
622 622 * If this is a global symbol, and it hasn't explicitly been defined as being
623 623 * directly bound to, indicate that it can't be directly bound to.
624 624 * Historically, most special symbols only have meaning to the object in which
625 625 * they exist, however, they've always been global. To ensure compatibility
626 626 * with any unexpected use presently in effect, ensure these symbols don't get
627 627 * directly bound to. Note, that establishing this state here isn't sufficient
628 628 * to create a syminfo table, only if a syminfo table is being created by some
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629 629 * other symbol directives will the nodirect binding be recorded. This ensures
630 630 * we don't create syminfo sections for all objects we create, as this might add
631 631 * unnecessary bloat to users who haven't explicitly requested extra symbol
632 632 * information.
633 633 */
634 634 static uintptr_t
635 635 sym_add_spec(const char *name, const char *uname, Word sdaux_id,
636 636 sd_flag_t sdflags_u, sd_flag_t sdflags, Ofl_desc *ofl)
637 637 {
638 638 Sym_desc *sdp;
639 - Sym_desc *usdp;
639 + Sym_desc *usdp;
640 640 Sym *sym;
641 641 Word hash;
642 642 avl_index_t where;
643 643
644 644 /* LINTED */
645 645 hash = (Word)elf_hash(uname);
646 646 if (usdp = ld_sym_find(uname, hash, &where, ofl)) {
647 647 /*
648 648 * If the underscore symbol exists and is undefined, or was
649 649 * defined in a shared library, convert it to a local symbol.
650 650 * Otherwise leave it as is and warn the user.
651 651 */
652 652 if ((usdp->sd_shndx == SHN_UNDEF) ||
653 653 (usdp->sd_ref != REF_REL_NEED)) {
654 654 usdp->sd_ref = REF_REL_NEED;
655 655 usdp->sd_shndx = usdp->sd_sym->st_shndx = SHN_ABS;
656 656 usdp->sd_flags |= FLG_SY_SPECSEC | sdflags_u;
657 657 usdp->sd_sym->st_info =
658 658 ELF_ST_INFO(STB_GLOBAL, STT_OBJECT);
659 659 usdp->sd_isc = NULL;
660 660 usdp->sd_sym->st_size = 0;
661 661 usdp->sd_sym->st_value = 0;
662 662 /* LINTED */
663 663 usdp->sd_aux->sa_symspec = (Half)sdaux_id;
664 664
665 665 /*
666 666 * If a user hasn't specifically indicated that the
667 667 * scope of this symbol be made local, then leave it
668 668 * as global (ie. prevent automatic scoping). The GOT
669 669 * should be defined protected, whereas all other
670 670 * special symbols are tagged as no-direct.
671 671 */
672 672 if (!SYM_IS_HIDDEN(usdp) &&
673 673 (sdflags & FLG_SY_DEFAULT)) {
674 674 usdp->sd_aux->sa_overndx = VER_NDX_GLOBAL;
675 675 if (sdaux_id == SDAUX_ID_GOT) {
676 676 usdp->sd_flags &= ~FLG_SY_NDIR;
677 677 usdp->sd_flags |= FLG_SY_PROTECT;
678 678 usdp->sd_sym->st_other = STV_PROTECTED;
679 679 } else if (
680 680 ((usdp->sd_flags & FLG_SY_DIR) == 0) &&
681 681 ((ofl->ofl_flags & FLG_OF_SYMBOLIC) == 0)) {
682 682 usdp->sd_flags |= FLG_SY_NDIR;
683 683 }
684 684 }
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685 685 usdp->sd_flags |= sdflags;
686 686
687 687 /*
688 688 * If the reference originated from a mapfile ensure
689 689 * we mark the symbol as used.
690 690 */
691 691 if (usdp->sd_flags & FLG_SY_MAPREF)
692 692 usdp->sd_flags |= FLG_SY_MAPUSED;
693 693
694 694 DBG_CALL(Dbg_syms_updated(ofl, usdp, uname));
695 - } else
695 + } else {
696 696 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_RESERVE),
697 697 uname, usdp->sd_file->ifl_name);
698 + }
698 699 } else {
699 700 /*
700 701 * If the symbol does not exist create it.
701 702 */
702 703 if ((sym = libld_calloc(sizeof (Sym), 1)) == NULL)
703 704 return (S_ERROR);
704 705 sym->st_shndx = SHN_ABS;
705 706 sym->st_info = ELF_ST_INFO(STB_GLOBAL, STT_OBJECT);
706 707 sym->st_size = 0;
707 708 sym->st_value = 0;
708 709 DBG_CALL(Dbg_syms_created(ofl->ofl_lml, uname));
709 710 if ((usdp = ld_sym_enter(uname, sym, hash, (Ifl_desc *)NULL,
710 711 ofl, 0, SHN_ABS, (FLG_SY_SPECSEC | sdflags_u), &where)) ==
711 712 (Sym_desc *)S_ERROR)
712 713 return (S_ERROR);
713 714 usdp->sd_ref = REF_REL_NEED;
714 715 /* LINTED */
715 716 usdp->sd_aux->sa_symspec = (Half)sdaux_id;
716 717
717 718 usdp->sd_aux->sa_overndx = VER_NDX_GLOBAL;
718 719
719 720 if (sdaux_id == SDAUX_ID_GOT) {
720 721 usdp->sd_flags |= FLG_SY_PROTECT;
721 722 usdp->sd_sym->st_other = STV_PROTECTED;
722 723 } else if ((sdflags & FLG_SY_DEFAULT) &&
723 724 ((ofl->ofl_flags & FLG_OF_SYMBOLIC) == 0)) {
724 725 usdp->sd_flags |= FLG_SY_NDIR;
725 726 }
726 727 usdp->sd_flags |= sdflags;
727 728 }
728 729
729 730 if (name && (sdp = ld_sym_find(name, SYM_NOHASH, NULL, ofl)) &&
730 731 (sdp->sd_sym->st_shndx == SHN_UNDEF)) {
731 732 uchar_t bind;
732 733
733 734 /*
734 735 * If the non-underscore symbol exists and is undefined
735 736 * convert it to be a local. If the underscore has
736 737 * sa_symspec set (ie. it was created above) then simulate this
737 738 * as a weak alias.
738 739 */
739 740 sdp->sd_ref = REF_REL_NEED;
740 741 sdp->sd_shndx = sdp->sd_sym->st_shndx = SHN_ABS;
741 742 sdp->sd_flags |= FLG_SY_SPECSEC;
742 743 sdp->sd_isc = NULL;
743 744 sdp->sd_sym->st_size = 0;
744 745 sdp->sd_sym->st_value = 0;
745 746 /* LINTED */
746 747 sdp->sd_aux->sa_symspec = (Half)sdaux_id;
747 748 if (usdp->sd_aux->sa_symspec) {
748 749 usdp->sd_aux->sa_linkndx = 0;
749 750 sdp->sd_aux->sa_linkndx = 0;
750 751 bind = STB_WEAK;
751 752 } else
752 753 bind = STB_GLOBAL;
753 754 sdp->sd_sym->st_info = ELF_ST_INFO(bind, STT_OBJECT);
754 755
755 756 /*
756 757 * If a user hasn't specifically indicated the scope of this
757 758 * symbol be made local then leave it as global (ie. prevent
758 759 * automatic scoping). The GOT should be defined protected,
759 760 * whereas all other special symbols are tagged as no-direct.
760 761 */
761 762 if (!SYM_IS_HIDDEN(sdp) &&
762 763 (sdflags & FLG_SY_DEFAULT)) {
763 764 sdp->sd_aux->sa_overndx = VER_NDX_GLOBAL;
764 765 if (sdaux_id == SDAUX_ID_GOT) {
765 766 sdp->sd_flags &= ~FLG_SY_NDIR;
766 767 sdp->sd_flags |= FLG_SY_PROTECT;
767 768 sdp->sd_sym->st_other = STV_PROTECTED;
768 769 } else if (((sdp->sd_flags & FLG_SY_DIR) == 0) &&
769 770 ((ofl->ofl_flags & FLG_OF_SYMBOLIC) == 0)) {
770 771 sdp->sd_flags |= FLG_SY_NDIR;
771 772 }
772 773 }
773 774 sdp->sd_flags |= sdflags;
774 775
775 776 /*
776 777 * If the reference originated from a mapfile ensure
777 778 * we mark the symbol as used.
778 779 */
779 780 if (sdp->sd_flags & FLG_SY_MAPREF)
780 781 sdp->sd_flags |= FLG_SY_MAPUSED;
781 782
782 783 DBG_CALL(Dbg_syms_updated(ofl, sdp, name));
783 784 }
784 785 return (1);
785 786 }
786 787
787 788
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788 789 /*
789 790 * Undefined symbols can fall into one of four types:
790 791 *
791 792 * - the symbol is really undefined (SHN_UNDEF).
792 793 *
793 794 * - versioning has been enabled, however this symbol has not been assigned
794 795 * to one of the defined versions.
795 796 *
796 797 * - the symbol has been defined by an implicitly supplied library, ie. one
797 798 * 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 + * than from a command line supplied library which would become the only
799 800 * dependency of the output file being produced.
800 801 *
801 802 * - the symbol has been defined by a version of a shared object that is
802 803 * not permitted for this link-edit.
803 804 *
804 805 * In all cases the file who made the first reference to this symbol will have
805 806 * been recorded via the `sa_rfile' pointer.
806 807 */
807 808 typedef enum {
808 809 UNDEF, NOVERSION, IMPLICIT, NOTAVAIL,
809 810 BNDLOCAL
810 811 } Type;
811 812
812 813 static const Msg format[] = {
813 814 MSG_SYM_UND_UNDEF, /* MSG_INTL(MSG_SYM_UND_UNDEF) */
814 815 MSG_SYM_UND_NOVER, /* MSG_INTL(MSG_SYM_UND_NOVER) */
815 816 MSG_SYM_UND_IMPL, /* MSG_INTL(MSG_SYM_UND_IMPL) */
816 817 MSG_SYM_UND_NOTA, /* MSG_INTL(MSG_SYM_UND_NOTA) */
817 818 MSG_SYM_UND_BNDLOCAL /* MSG_INTL(MSG_SYM_UND_BNDLOCAL) */
818 819 };
819 820
820 821 /*
821 822 * Issue an undefined symbol message for the given symbol.
822 823 *
823 824 * entry:
824 825 * ofl - Output descriptor
825 826 * sdp - Undefined symbol to report
826 827 * type - Type of undefined symbol
827 828 * ofl_flag - One of 0, FLG_OF_FATAL, or FLG_OF_WARN.
828 829 * undef_state - Address of variable to be initialized to 0
829 830 * before the first call to sym_undef_entry, and passed
830 831 * to each subsequent call. A non-zero value for *undef_state
831 832 * indicates that this is not the first call in the series.
832 833 *
833 834 * exit:
834 835 * If *undef_state is 0, a title is issued.
835 836 *
836 837 * A message for the undefined symbol is issued.
837 838 *
838 839 * If ofl_flag is non-zero, its value is OR'd into *undef_state. Otherwise,
839 840 * all bits other than FLG_OF_FATAL and FLG_OF_WARN are set, in order to
840 841 * provide *undef_state with a non-zero value. These other bits have
841 842 * no meaning beyond that, and serve to ensure that *undef_state is
842 843 * non-zero if sym_undef_entry() has been called.
843 844 */
844 845 static void
845 846 sym_undef_entry(Ofl_desc *ofl, Sym_desc *sdp, Type type, ofl_flag_t ofl_flag,
846 847 ofl_flag_t *undef_state)
847 848 {
848 849 const char *name1, *name2, *name3;
849 850 Ifl_desc *ifl = sdp->sd_file;
850 851 Sym_aux *sap = sdp->sd_aux;
851 852
852 853 if (*undef_state == 0)
853 854 ld_eprintf(ofl, ERR_NONE, MSG_INTL(MSG_SYM_FMT_UNDEF),
854 855 MSG_INTL(MSG_SYM_UNDEF_ITM_11),
855 856 MSG_INTL(MSG_SYM_UNDEF_ITM_21),
856 857 MSG_INTL(MSG_SYM_UNDEF_ITM_12),
857 858 MSG_INTL(MSG_SYM_UNDEF_ITM_22));
858 859
859 860 ofl->ofl_flags |= ofl_flag;
860 861 *undef_state |= ofl_flag ? ofl_flag : ~(FLG_OF_FATAL | FLG_OF_WARN);
861 862
862 863 switch (type) {
863 864 case UNDEF:
864 865 case BNDLOCAL:
865 866 name1 = sap->sa_rfile;
866 867 break;
867 868 case NOVERSION:
868 869 name1 = ifl->ifl_name;
869 870 break;
870 871 case IMPLICIT:
871 872 name1 = sap->sa_rfile;
872 873 name2 = ifl->ifl_name;
873 874 break;
874 875 case NOTAVAIL:
875 876 name1 = sap->sa_rfile;
876 877 name2 = sap->sa_vfile;
877 878 name3 = ifl->ifl_verndx[sap->sa_dverndx].vi_name;
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878 879 break;
879 880 default:
880 881 return;
881 882 }
882 883
883 884 ld_eprintf(ofl, ERR_NONE, MSG_INTL(format[type]),
884 885 demangle(sdp->sd_name), name1, name2, name3);
885 886 }
886 887
887 888 /*
889 + * If an undef symbol exists naming a bound for the output section,
890 + * turn it into a defined symbol with the correct value.
891 + *
892 + * We set an arbitrary 1KB limit on the resulting symbol names.
893 + */
894 +static void
895 +sym_add_bounds(Ofl_desc *ofl, Os_desc *osp, Word bound)
896 +{
897 + Sym_desc *bsdp;
898 + char symn[1024];
899 + size_t nsz;
900 +
901 + switch (bound) {
902 + case SDAUX_ID_SECBOUND_START:
903 + nsz = snprintf(symn, sizeof (symn), "%s%s",
904 + MSG_ORIG(MSG_SYM_SECBOUND_START), osp->os_name);
905 + if (nsz >= sizeof (symn))
906 + return;
907 + break;
908 + case SDAUX_ID_SECBOUND_STOP:
909 + nsz = snprintf(symn, sizeof (symn), "%s%s",
910 + MSG_ORIG(MSG_SYM_SECBOUND_STOP), osp->os_name);
911 + if (nsz >= sizeof (symn))
912 + return;
913 + break;
914 + default:
915 + assert(0);
916 + }
917 +
918 + if ((bsdp = ld_sym_find(symn, SYM_NOHASH, NULL, ofl)) != NULL) {
919 + if ((bsdp->sd_shndx != SHN_UNDEF) &&
920 + (bsdp->sd_ref == REF_REL_NEED)) {
921 + ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_RESERVE),
922 + symn, bsdp->sd_file->ifl_name);
923 + return;
924 + }
925 +
926 + DBG_CALL(Dbg_syms_updated(ofl, bsdp, symn));
927 +
928 + bsdp->sd_aux->sa_symspec = bound;
929 + bsdp->sd_aux->sa_boundsec = osp;
930 + bsdp->sd_flags |= FLG_SY_SPECSEC;
931 + bsdp->sd_ref = REF_REL_NEED;
932 + bsdp->sd_sym->st_info = ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE);
933 + bsdp->sd_sym->st_other = STV_PROTECTED;
934 + bsdp->sd_isc = NULL;
935 + bsdp->sd_sym->st_size = 0;
936 + bsdp->sd_sym->st_value = 0;
937 + bsdp->sd_shndx = bsdp->sd_sym->st_shndx = SHN_ABS;
938 + }
939 +}
940 +
941 +static Boolean
942 +is_cname(const char *name)
943 +{
944 + if (strlen(name) == strspn(name,
945 + "abcdefghijklmnopqrstuvwxyz"
946 + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
947 + "0123456789"
948 + "_"))
949 + return (TRUE);
950 + else
951 + return (FALSE);
952 +}
953 +
954 +/*
888 955 * At this point all symbol input processing has been completed, therefore
889 956 * complete the symbol table entries by generating any necessary internal
890 957 * symbols.
891 958 */
892 959 uintptr_t
893 960 ld_sym_spec(Ofl_desc *ofl)
894 961 {
895 962 Sym_desc *sdp;
963 + Sg_desc *sgp;
964 +
965 + DBG_CALL(Dbg_syms_spec_title(ofl->ofl_lml));
966 +
967 + /*
968 + * For each section in the output file, look for symbols named for the
969 + * __start/__stop patterns. If references exist, flesh the symbols to
970 + * be defined.
971 + *
972 + * The symbols are given values at the same time as the other special
973 + * symbols.
974 + */
975 + if (!(ofl->ofl_flags & FLG_OF_RELOBJ) ||
976 + (ofl->ofl_flags & FLG_OF_KMOD)) {
977 + Aliste idx1;
978 +
979 + for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
980 + Os_desc *osp;
981 + Aliste idx2;
982 +
983 + for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp)) {
984 + if (is_cname(osp->os_name)) {
985 + sym_add_bounds(ofl, osp,
986 + SDAUX_ID_SECBOUND_START);
987 + sym_add_bounds(ofl, osp,
988 + SDAUX_ID_SECBOUND_STOP);
989 + }
990 + }
991 + }
992 + }
896 993
897 994 if (ofl->ofl_flags & FLG_OF_RELOBJ)
898 995 return (1);
899 996
900 - DBG_CALL(Dbg_syms_spec_title(ofl->ofl_lml));
901 -
902 997 if (sym_add_spec(MSG_ORIG(MSG_SYM_ETEXT), MSG_ORIG(MSG_SYM_ETEXT_U),
903 998 SDAUX_ID_ETEXT, 0, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
904 999 ofl) == S_ERROR)
905 1000 return (S_ERROR);
906 1001 if (sym_add_spec(MSG_ORIG(MSG_SYM_EDATA), MSG_ORIG(MSG_SYM_EDATA_U),
907 1002 SDAUX_ID_EDATA, 0, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
908 1003 ofl) == S_ERROR)
909 1004 return (S_ERROR);
910 1005 if (sym_add_spec(MSG_ORIG(MSG_SYM_END), MSG_ORIG(MSG_SYM_END_U),
911 1006 SDAUX_ID_END, FLG_SY_DYNSORT, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
912 1007 ofl) == S_ERROR)
913 1008 return (S_ERROR);
914 1009 if (sym_add_spec(MSG_ORIG(MSG_SYM_L_END), MSG_ORIG(MSG_SYM_L_END_U),
915 1010 SDAUX_ID_END, 0, FLG_SY_HIDDEN, ofl) == S_ERROR)
916 1011 return (S_ERROR);
917 1012 if (sym_add_spec(MSG_ORIG(MSG_SYM_L_START), MSG_ORIG(MSG_SYM_L_START_U),
918 1013 SDAUX_ID_START, 0, FLG_SY_HIDDEN, ofl) == S_ERROR)
919 1014 return (S_ERROR);
920 1015
921 1016 /*
922 1017 * Historically we've always produced a _DYNAMIC symbol, even for
923 1018 * static executables (in which case its value will be 0).
924 1019 */
925 1020 if (sym_add_spec(MSG_ORIG(MSG_SYM_DYNAMIC), MSG_ORIG(MSG_SYM_DYNAMIC_U),
926 1021 SDAUX_ID_DYN, FLG_SY_DYNSORT, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
927 1022 ofl) == S_ERROR)
928 1023 return (S_ERROR);
929 1024
930 1025 if (OFL_ALLOW_DYNSYM(ofl))
931 1026 if (sym_add_spec(MSG_ORIG(MSG_SYM_PLKTBL),
932 1027 MSG_ORIG(MSG_SYM_PLKTBL_U), SDAUX_ID_PLT,
933 1028 FLG_SY_DYNSORT, (FLG_SY_DEFAULT | FLG_SY_EXPDEF),
934 1029 ofl) == S_ERROR)
935 1030 return (S_ERROR);
936 1031
937 1032 /*
938 1033 * A GOT reference will be accompanied by the associated GOT symbol.
939 1034 * Make sure it gets assigned the appropriate special attributes.
940 1035 */
941 1036 if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL_U),
942 1037 SYM_NOHASH, NULL, ofl)) != NULL) && (sdp->sd_ref != REF_DYN_SEEN)) {
943 1038 if (sym_add_spec(MSG_ORIG(MSG_SYM_GOFTBL),
944 1039 MSG_ORIG(MSG_SYM_GOFTBL_U), SDAUX_ID_GOT, FLG_SY_DYNSORT,
945 1040 (FLG_SY_DEFAULT | FLG_SY_EXPDEF), ofl) == S_ERROR)
946 1041 return (S_ERROR);
947 1042 }
948 1043
949 1044 return (1);
950 1045 }
951 1046
952 1047 /*
953 1048 * Determine a potential capability symbol's visibility.
954 1049 *
955 1050 * The -z symbolcap option transforms an object capabilities relocatable object
956 1051 * into a symbol capabilities relocatable object. Any global function symbols,
957 1052 * or initialized global data symbols are candidates for transforming into local
958 1053 * symbol capabilities definitions. However, if a user indicates that a symbol
959 1054 * should be demoted to local using a mapfile, then there is no need to
960 1055 * transform the associated global symbol.
961 1056 *
962 1057 * Normally, a symbol's visibility is determined after the symbol resolution
963 1058 * process, after all symbol state has been gathered and resolved. However,
964 1059 * for -z symbolcap, this determination is too late. When a global symbol is
965 1060 * read from an input file we need to determine it's visibility so as to decide
966 1061 * whether to create a local or not.
967 1062 *
968 1063 * If a user has explicitly defined this symbol as having local scope within a
969 1064 * mapfile, then a symbol of the same name already exists. However, explicit
970 1065 * local definitions are uncommon, as most mapfiles define the global symbol
971 1066 * requirements together with an auto-reduction directive '*'. If this state
972 1067 * has been defined, then we must make sure that the new symbol isn't a type
973 1068 * that can not be demoted to local.
974 1069 */
975 1070 static int
976 1071 sym_cap_vis(const char *name, Word hash, Sym *sym, Ofl_desc *ofl)
977 1072 {
978 1073 Sym_desc *sdp;
979 1074 uchar_t vis;
980 1075 avl_index_t where;
981 1076 sd_flag_t sdflags = 0;
982 1077
983 1078 /*
984 1079 * Determine the visibility of the new symbol.
985 1080 */
986 1081 vis = ELF_ST_VISIBILITY(sym->st_other);
987 1082 switch (vis) {
988 1083 case STV_EXPORTED:
989 1084 sdflags |= FLG_SY_EXPORT;
990 1085 break;
991 1086 case STV_SINGLETON:
992 1087 sdflags |= FLG_SY_SINGLE;
993 1088 break;
994 1089 }
995 1090
996 1091 /*
997 1092 * Determine whether a symbol definition already exists, and if so
998 1093 * obtain the visibility.
999 1094 */
1000 1095 if ((sdp = ld_sym_find(name, hash, &where, ofl)) != NULL)
1001 1096 sdflags |= sdp->sd_flags;
1002 1097
1003 1098 /*
1004 1099 * Determine whether the symbol flags indicate this symbol should be
1005 1100 * hidden.
1006 1101 */
1007 1102 if ((ofl->ofl_flags & (FLG_OF_AUTOLCL | FLG_OF_AUTOELM)) &&
1008 1103 ((sdflags & MSK_SY_NOAUTO) == 0))
1009 1104 sdflags |= FLG_SY_HIDDEN;
1010 1105
1011 1106 return ((sdflags & FLG_SY_HIDDEN) == 0);
1012 1107 }
1013 1108
1014 1109 /*
1015 1110 * This routine checks to see if a symbols visibility needs to be reduced to
1016 1111 * either SYMBOLIC or LOCAL. This routine can be called from either
1017 1112 * reloc_init() or sym_validate().
1018 1113 */
1019 1114 void
1020 1115 ld_sym_adjust_vis(Sym_desc *sdp, Ofl_desc *ofl)
1021 1116 {
1022 1117 ofl_flag_t oflags = ofl->ofl_flags;
1023 1118 Sym *sym = sdp->sd_sym;
1024 1119
1025 1120 if ((sdp->sd_ref == REF_REL_NEED) &&
1026 1121 (sdp->sd_sym->st_shndx != SHN_UNDEF)) {
1027 1122 /*
1028 1123 * If auto-reduction/elimination is enabled, reduce any
1029 1124 * non-versioned, and non-local capabilities global symbols.
1030 1125 * A symbol is a candidate for auto-reduction/elimination if:
1031 1126 *
1032 1127 * - the symbol wasn't explicitly defined within a mapfile
1033 1128 * (in which case all the necessary state has been applied
1034 1129 * to the symbol), or
1035 1130 * - the symbol isn't one of the family of reserved
1036 1131 * special symbols (ie. _end, _etext, etc.), or
1037 1132 * - the symbol isn't a SINGLETON, or
1038 1133 * - the symbol wasn't explicitly defined within a version
1039 1134 * definition associated with an input relocatable object.
1040 1135 *
1041 1136 * Indicate that the symbol has been reduced as it may be
1042 1137 * necessary to print these symbols later.
1043 1138 */
1044 1139 if ((oflags & (FLG_OF_AUTOLCL | FLG_OF_AUTOELM)) &&
1045 1140 ((sdp->sd_flags & MSK_SY_NOAUTO) == 0)) {
1046 1141 if ((sdp->sd_flags & FLG_SY_HIDDEN) == 0) {
1047 1142 sdp->sd_flags |=
1048 1143 (FLG_SY_REDUCED | FLG_SY_HIDDEN);
1049 1144 }
1050 1145
1051 1146 if (oflags & (FLG_OF_REDLSYM | FLG_OF_AUTOELM)) {
1052 1147 sdp->sd_flags |= FLG_SY_ELIM;
1053 1148 sym->st_other = STV_ELIMINATE |
1054 1149 (sym->st_other & ~MSK_SYM_VISIBILITY);
1055 1150 } else if (ELF_ST_VISIBILITY(sym->st_other) !=
1056 1151 STV_INTERNAL)
1057 1152 sym->st_other = STV_HIDDEN |
1058 1153 (sym->st_other & ~MSK_SYM_VISIBILITY);
1059 1154 }
1060 1155
1061 1156 /*
1062 1157 * If -Bsymbolic is in effect, and the symbol hasn't explicitly
1063 1158 * been defined nodirect (via a mapfile), then bind the global
1064 1159 * symbol symbolically and assign the STV_PROTECTED visibility
1065 1160 * attribute.
1066 1161 */
1067 1162 if ((oflags & FLG_OF_SYMBOLIC) &&
1068 1163 ((sdp->sd_flags & (FLG_SY_HIDDEN | FLG_SY_NDIR)) == 0)) {
1069 1164 sdp->sd_flags |= FLG_SY_PROTECT;
1070 1165 if (ELF_ST_VISIBILITY(sym->st_other) == STV_DEFAULT)
1071 1166 sym->st_other = STV_PROTECTED |
1072 1167 (sym->st_other & ~MSK_SYM_VISIBILITY);
1073 1168 }
1074 1169 }
1075 1170
1076 1171 /*
1077 1172 * Indicate that this symbol has had it's visibility checked so that
1078 1173 * we don't need to do this investigation again.
1079 1174 */
1080 1175 sdp->sd_flags |= FLG_SY_VISIBLE;
1081 1176 }
1082 1177
1083 1178 /*
1084 1179 * Make sure a symbol definition is local to the object being built.
1085 1180 */
1086 1181 inline static int
1087 1182 ensure_sym_local(Ofl_desc *ofl, Sym_desc *sdp, const char *str)
1088 1183 {
1089 1184 if (sdp->sd_sym->st_shndx == SHN_UNDEF) {
1090 1185 if (str) {
1091 1186 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_SYM_UNDEF),
1092 1187 str, demangle((char *)sdp->sd_name));
1093 1188 }
1094 1189 return (1);
1095 1190 }
1096 1191 if (sdp->sd_ref != REF_REL_NEED) {
1097 1192 if (str) {
1098 1193 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_SYM_EXTERN),
1099 1194 str, demangle((char *)sdp->sd_name),
1100 1195 sdp->sd_file->ifl_name);
1101 1196 }
1102 1197 return (1);
1103 1198 }
1104 1199
1105 1200 sdp->sd_flags |= FLG_SY_UPREQD;
1106 1201 if (sdp->sd_isc) {
1107 1202 sdp->sd_isc->is_flags |= FLG_IS_SECTREF;
1108 1203 sdp->sd_isc->is_file->ifl_flags |= FLG_IF_FILEREF;
1109 1204 }
1110 1205 return (0);
1111 1206 }
1112 1207
1113 1208 /*
1114 1209 * Make sure all the symbol definitions required for initarray, finiarray, or
1115 1210 * preinitarray's are local to the object being built.
1116 1211 */
1117 1212 static int
1118 1213 ensure_array_local(Ofl_desc *ofl, APlist *apl, const char *str)
1119 1214 {
1120 1215 Aliste idx;
1121 1216 Sym_desc *sdp;
1122 1217 int ret = 0;
1123 1218
1124 1219 for (APLIST_TRAVERSE(apl, idx, sdp))
1125 1220 ret += ensure_sym_local(ofl, sdp, str);
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1126 1221
1127 1222 return (ret);
1128 1223 }
1129 1224
1130 1225 /*
1131 1226 * After all symbol table input processing has been finished, and all relocation
1132 1227 * counting has been carried out (ie. no more symbols will be read, generated,
1133 1228 * or modified), validate and count the relevant entries:
1134 1229 *
1135 1230 * - 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
1231 + * has been defined by virtue of the inclusion of an implicit shared
1137 1232 * library, it is still classed as undefined.
1138 1233 *
1139 1234 * - count the number of global needed symbols together with the size of
1140 1235 * their associated name strings (if scoping has been indicated these
1141 1236 * symbols may be reduced to locals).
1142 1237 *
1143 1238 * - establish the size and alignment requirements for the global .bss
1144 - * section (the alignment of this section is based on the first symbol
1239 + * section (the alignment of this section is based on the first symbol
1145 1240 * that it will contain).
1146 1241 */
1147 1242 uintptr_t
1148 1243 ld_sym_validate(Ofl_desc *ofl)
1149 1244 {
1150 1245 Sym_avlnode *sav;
1151 1246 Sym_desc *sdp;
1152 1247 Sym *sym;
1153 1248 ofl_flag_t oflags = ofl->ofl_flags;
1154 1249 ofl_flag_t undef = 0, needed = 0, verdesc = 0;
1155 1250 Xword bssalign = 0, tlsalign = 0;
1156 1251 Boolean need_bss, need_tlsbss;
1157 1252 Xword bsssize = 0, tlssize = 0;
1158 1253 #if defined(_ELF64)
1159 1254 Xword lbssalign = 0, lbsssize = 0;
1160 1255 Boolean need_lbss;
1161 1256 #endif
1162 1257 int ret, allow_ldynsym;
1163 1258 uchar_t type;
1164 1259 ofl_flag_t undef_state = 0;
1165 1260
1166 1261 DBG_CALL(Dbg_basic_validate(ofl->ofl_lml));
1167 1262
1168 1263 /*
1169 1264 * The need_XXX booleans are used to determine whether we need to
1170 1265 * create each type of bss section. We used to create these sections
1171 1266 * if the sum of the required sizes for each type were non-zero.
1172 1267 * However, it is possible for a compiler to generate COMMON variables
1173 1268 * of zero-length and this tricks that logic --- even zero-length
1174 1269 * symbols need an output section.
1175 1270 */
1176 1271 need_bss = need_tlsbss = FALSE;
1177 1272 #if defined(_ELF64)
1178 1273 need_lbss = FALSE;
1179 1274 #endif
1180 1275
1181 1276 /*
1182 1277 * Determine how undefined symbols are handled:
1183 1278 *
1184 1279 * fatal:
1185 1280 * If this link-edit calls for no undefined symbols to remain
1186 1281 * (this is the default case when generating an executable but
1187 1282 * can be enforced for any object using -z defs), a fatal error
1188 1283 * condition will be indicated.
1189 1284 *
1190 1285 * warning:
1191 1286 * If we're creating a shared object, and either the -Bsymbolic
1192 1287 * flag is set, or the user has turned on the -z guidance feature,
1193 1288 * then a non-fatal warning is issued for each symbol.
1194 1289 *
1195 1290 * ignore:
1196 1291 * In all other cases, undefined symbols are quietly allowed.
1197 1292 */
1198 1293 if (oflags & FLG_OF_NOUNDEF) {
1199 1294 undef = FLG_OF_FATAL;
1200 1295 } else if (oflags & FLG_OF_SHAROBJ) {
1201 1296 if ((oflags & FLG_OF_SYMBOLIC) ||
1202 1297 OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS))
1203 1298 undef = FLG_OF_WARN;
1204 1299 }
1205 1300
1206 1301 /*
1207 1302 * If the symbol is referenced from an implicitly included shared object
1208 1303 * (ie. it's not on the NEEDED list) then the symbol is also classified
1209 1304 * as undefined and a fatal error condition will be indicated.
1210 1305 */
1211 1306 if ((oflags & FLG_OF_NOUNDEF) || !(oflags & FLG_OF_SHAROBJ))
1212 1307 needed = FLG_OF_FATAL;
1213 1308 else if ((oflags & FLG_OF_SHAROBJ) &&
1214 1309 OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS))
1215 1310 needed = FLG_OF_WARN;
1216 1311
1217 1312 /*
1218 1313 * If the output image is being versioned, then all symbol definitions
1219 1314 * must be associated with a version. Any symbol that isn't associated
1220 1315 * with a version is classified as undefined, and a fatal error
1221 1316 * condition is indicated.
1222 1317 */
1223 1318 if ((oflags & FLG_OF_VERDEF) && (ofl->ofl_vercnt > VER_NDX_GLOBAL))
1224 1319 verdesc = FLG_OF_FATAL;
1225 1320
1226 1321 allow_ldynsym = OFL_ALLOW_LDYNSYM(ofl);
1227 1322
1228 1323 if (allow_ldynsym) {
1229 1324 /*
1230 1325 * Normally, we disallow symbols with 0 size from appearing
1231 1326 * in a dyn[sym|tls]sort section. However, there are some
1232 1327 * symbols that serve special purposes that we want to exempt
1233 1328 * from this rule. Look them up, and set their
1234 1329 * FLG_SY_DYNSORT flag.
1235 1330 */
1236 1331 static const char *special[] = {
1237 1332 MSG_ORIG(MSG_SYM_INIT_U), /* _init */
1238 1333 MSG_ORIG(MSG_SYM_FINI_U), /* _fini */
1239 1334 MSG_ORIG(MSG_SYM_START), /* _start */
1240 1335 NULL
1241 1336 };
1242 1337 int i;
1243 1338
1244 1339 for (i = 0; special[i] != NULL; i++) {
1245 1340 if (((sdp = ld_sym_find(special[i],
1246 1341 SYM_NOHASH, NULL, ofl)) != NULL) &&
1247 1342 (sdp->sd_sym->st_size == 0)) {
1248 1343 if (ld_sym_copy(sdp) == S_ERROR)
1249 1344 return (S_ERROR);
1250 1345 sdp->sd_flags |= FLG_SY_DYNSORT;
1251 1346 }
1252 1347 }
1253 1348 }
1254 1349
1255 1350 /*
1256 1351 * Collect and validate the globals from the internal symbol table.
1257 1352 */
1258 1353 for (sav = avl_first(&ofl->ofl_symavl); sav;
1259 1354 sav = AVL_NEXT(&ofl->ofl_symavl, sav)) {
1260 1355 Is_desc *isp;
1261 1356 int undeferr = 0;
1262 1357 uchar_t vis;
1263 1358
1264 1359 sdp = sav->sav_sdp;
1265 1360
1266 1361 /*
1267 1362 * If undefined symbols are allowed, and we're not being
1268 1363 * asked to supply guidance, ignore any symbols that are
1269 1364 * not needed.
1270 1365 */
1271 1366 if (!(oflags & FLG_OF_NOUNDEF) &&
1272 1367 !OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS) &&
1273 1368 (sdp->sd_ref == REF_DYN_SEEN))
1274 1369 continue;
1275 1370
1276 1371 /*
1277 1372 * If the symbol originates from an external or parent mapfile
1278 1373 * reference and hasn't been matched to a reference from a
1279 1374 * relocatable object, ignore it.
1280 1375 */
1281 1376 if ((sdp->sd_flags & (FLG_SY_EXTERN | FLG_SY_PARENT)) &&
1282 1377 ((sdp->sd_flags & FLG_SY_MAPUSED) == 0)) {
1283 1378 sdp->sd_flags |= FLG_SY_INVALID;
1284 1379 continue;
1285 1380 }
1286 1381
1287 1382 sym = sdp->sd_sym;
1288 1383 type = ELF_ST_TYPE(sym->st_info);
1289 1384
1290 1385 /*
1291 1386 * Sanity check TLS.
1292 1387 */
1293 1388 if ((type == STT_TLS) && (sym->st_size != 0) &&
1294 1389 (sym->st_shndx != SHN_UNDEF) &&
1295 1390 (sym->st_shndx != SHN_COMMON)) {
1296 1391 Is_desc *isp = sdp->sd_isc;
1297 1392 Ifl_desc *ifl = sdp->sd_file;
1298 1393
1299 1394 if ((isp == NULL) || (isp->is_shdr == NULL) ||
1300 1395 ((isp->is_shdr->sh_flags & SHF_TLS) == 0)) {
1301 1396 ld_eprintf(ofl, ERR_FATAL,
1302 1397 MSG_INTL(MSG_SYM_TLS),
1303 1398 demangle(sdp->sd_name), ifl->ifl_name);
1304 1399 continue;
1305 1400 }
1306 1401 }
1307 1402
1308 1403 if ((sdp->sd_flags & FLG_SY_VISIBLE) == 0)
1309 1404 ld_sym_adjust_vis(sdp, ofl);
1310 1405
1311 1406 if ((sdp->sd_flags & FLG_SY_REDUCED) &&
1312 1407 (oflags & FLG_OF_PROCRED)) {
1313 1408 DBG_CALL(Dbg_syms_reduce(ofl, DBG_SYM_REDUCE_GLOBAL,
1314 1409 sdp, 0, 0));
1315 1410 }
1316 1411
1317 1412 /*
1318 1413 * Record any STV_SINGLETON existence.
1319 1414 */
1320 1415 if ((vis = ELF_ST_VISIBILITY(sym->st_other)) == STV_SINGLETON)
1321 1416 ofl->ofl_dtflags_1 |= DF_1_SINGLETON;
1322 1417
1323 1418 /*
1324 1419 * If building a shared object or executable, and this is a
1325 1420 * non-weak UNDEF symbol with reduced visibility (STV_*), then
1326 1421 * give a fatal error.
1327 1422 */
1328 1423 if (((oflags & FLG_OF_RELOBJ) == 0) &&
1329 1424 (sym->st_shndx == SHN_UNDEF) &&
1330 1425 (ELF_ST_BIND(sym->st_info) != STB_WEAK)) {
1331 1426 if (vis && (vis != STV_SINGLETON)) {
1332 1427 sym_undef_entry(ofl, sdp, BNDLOCAL,
1333 1428 FLG_OF_FATAL, &undef_state);
1334 1429 continue;
1335 1430 }
1336 1431 }
1337 1432
1338 1433 /*
1339 1434 * If this symbol is defined in a non-allocatable section,
1340 1435 * reduce it to local symbol.
1341 1436 */
1342 1437 if (((isp = sdp->sd_isc) != 0) && isp->is_shdr &&
1343 1438 ((isp->is_shdr->sh_flags & SHF_ALLOC) == 0)) {
1344 1439 sdp->sd_flags |= (FLG_SY_REDUCED | FLG_SY_HIDDEN);
1345 1440 }
1346 1441
1347 1442 /*
1348 1443 * If this symbol originated as a SHN_SUNW_IGNORE, it will have
1349 1444 * been processed as an SHN_UNDEF. Return the symbol to its
1350 1445 * original index for validation, and propagation to the output
1351 1446 * file.
1352 1447 */
1353 1448 if (sdp->sd_flags & FLG_SY_IGNORE)
1354 1449 sdp->sd_shndx = SHN_SUNW_IGNORE;
1355 1450
1356 1451 if (undef) {
1357 1452 /*
1358 1453 * If a non-weak reference remains undefined, or if a
1359 1454 * mapfile reference is not bound to the relocatable
1360 1455 * objects that make up the object being built, we have
1361 1456 * a fatal error.
1362 1457 *
1363 1458 * The exceptions are symbols which are defined to be
1364 1459 * found in the parent (FLG_SY_PARENT), which is really
1365 1460 * only meaningful for direct binding, or are defined
1366 1461 * external (FLG_SY_EXTERN) so as to suppress -zdefs
1367 1462 * errors.
1368 1463 *
1369 1464 * Register symbols are always allowed to be UNDEF.
1370 1465 *
1371 1466 * Note that we don't include references created via -u
1372 1467 * in the same shared object binding test. This is for
1373 1468 * backward compatibility, in that a number of archive
1374 1469 * makefile rules used -u to cause archive extraction.
1375 1470 * These same rules have been cut and pasted to apply
1376 1471 * to shared objects, and thus although the -u reference
1377 1472 * is redundant, flagging it as fatal could cause some
1378 1473 * build to fail. Also we have documented the use of
1379 1474 * -u as a mechanism to cause binding to weak version
1380 1475 * definitions, thus giving users an error condition
1381 1476 * would be incorrect.
1382 1477 */
1383 1478 if (!(sdp->sd_flags & FLG_SY_REGSYM) &&
1384 1479 ((sym->st_shndx == SHN_UNDEF) &&
1385 1480 ((ELF_ST_BIND(sym->st_info) != STB_WEAK) &&
1386 1481 ((sdp->sd_flags &
1387 1482 (FLG_SY_PARENT | FLG_SY_EXTERN)) == 0)) ||
1388 1483 ((sdp->sd_flags &
1389 1484 (FLG_SY_MAPREF | FLG_SY_MAPUSED | FLG_SY_HIDDEN |
1390 1485 FLG_SY_PROTECT)) == FLG_SY_MAPREF))) {
1391 1486 sym_undef_entry(ofl, sdp, UNDEF, undef,
1392 1487 &undef_state);
1393 1488 undeferr = 1;
1394 1489 }
1395 1490
1396 1491 } else {
1397 1492 /*
1398 1493 * For building things like shared objects (or anything
1399 1494 * -znodefs), undefined symbols are allowed.
1400 1495 *
1401 1496 * If a mapfile reference remains undefined the user
1402 1497 * would probably like a warning at least (they've
1403 1498 * usually mis-spelt the reference). Refer to the above
1404 1499 * comments for discussion on -u references, which
1405 1500 * are not tested for in the same manner.
1406 1501 */
1407 1502 if ((sdp->sd_flags &
1408 1503 (FLG_SY_MAPREF | FLG_SY_MAPUSED)) ==
1409 1504 FLG_SY_MAPREF) {
1410 1505 sym_undef_entry(ofl, sdp, UNDEF, FLG_OF_WARN,
1411 1506 &undef_state);
1412 1507 undeferr = 1;
1413 1508 }
1414 1509 }
1415 1510
1416 1511 /*
1417 1512 * If this symbol comes from a dependency mark the dependency
1418 1513 * as required (-z ignore can result in unused dependencies
1419 1514 * being dropped). If we need to record dependency versioning
1420 1515 * information indicate what version of the needed shared object
1421 1516 * this symbol is part of. Flag the symbol as undefined if it
1422 1517 * has not been made available to us.
1423 1518 */
1424 1519 if ((sdp->sd_ref == REF_DYN_NEED) &&
1425 1520 (!(sdp->sd_flags & FLG_SY_REFRSD))) {
1426 1521 sdp->sd_file->ifl_flags |= FLG_IF_DEPREQD;
1427 1522
1428 1523 /*
1429 1524 * Capture that we've bound to a symbol that doesn't
1430 1525 * allow being directly bound to.
1431 1526 */
1432 1527 if (sdp->sd_flags & FLG_SY_NDIR)
1433 1528 ofl->ofl_flags1 |= FLG_OF1_NGLBDIR;
1434 1529
1435 1530 if (sdp->sd_file->ifl_vercnt) {
1436 1531 int vndx;
1437 1532 Ver_index *vip;
1438 1533
1439 1534 vndx = sdp->sd_aux->sa_dverndx;
1440 1535 vip = &sdp->sd_file->ifl_verndx[vndx];
1441 1536 if (vip->vi_flags & FLG_VER_AVAIL) {
1442 1537 vip->vi_flags |= FLG_VER_REFER;
1443 1538 } else {
1444 1539 sym_undef_entry(ofl, sdp, NOTAVAIL,
1445 1540 FLG_OF_FATAL, &undef_state);
1446 1541 continue;
1447 1542 }
1448 1543 }
1449 1544 }
1450 1545
1451 1546 /*
1452 1547 * Test that we do not bind to symbol supplied from an implicit
1453 1548 * shared object. If a binding is from a weak reference it can
1454 1549 * be ignored.
1455 1550 */
1456 1551 if (needed && !undeferr && (sdp->sd_flags & FLG_SY_GLOBREF) &&
1457 1552 (sdp->sd_ref == REF_DYN_NEED) &&
1458 1553 (sdp->sd_flags & FLG_SY_NOTAVAIL)) {
1459 1554 sym_undef_entry(ofl, sdp, IMPLICIT, needed,
1460 1555 &undef_state);
1461 1556 if (needed == FLG_OF_FATAL)
1462 1557 continue;
1463 1558 }
1464 1559
1465 1560 /*
1466 1561 * Test that a symbol isn't going to be reduced to local scope
1467 1562 * which actually wants to bind to a shared object - if so it's
1468 1563 * a fatal error.
1469 1564 */
1470 1565 if ((sdp->sd_ref == REF_DYN_NEED) &&
1471 1566 (sdp->sd_flags & (FLG_SY_HIDDEN | FLG_SY_PROTECT))) {
1472 1567 sym_undef_entry(ofl, sdp, BNDLOCAL, FLG_OF_FATAL,
1473 1568 &undef_state);
1474 1569 continue;
1475 1570 }
1476 1571
1477 1572 /*
1478 1573 * If the output image is to be versioned then all symbol
1479 1574 * definitions must be associated with a version. Remove any
1480 1575 * versioning that might be left associated with an undefined
1481 1576 * symbol.
1482 1577 */
1483 1578 if (verdesc && (sdp->sd_ref == REF_REL_NEED)) {
1484 1579 if (sym->st_shndx == SHN_UNDEF) {
1485 1580 if (sdp->sd_aux && sdp->sd_aux->sa_overndx)
1486 1581 sdp->sd_aux->sa_overndx = 0;
1487 1582 } else {
1488 1583 if (!SYM_IS_HIDDEN(sdp) && sdp->sd_aux &&
1489 1584 (sdp->sd_aux->sa_overndx == 0)) {
1490 1585 sym_undef_entry(ofl, sdp, NOVERSION,
1491 1586 verdesc, &undef_state);
1492 1587 continue;
1493 1588 }
1494 1589 }
1495 1590 }
1496 1591
1497 1592 /*
1498 1593 * If we don't need the symbol there's no need to process it
1499 1594 * any further.
1500 1595 */
1501 1596 if (sdp->sd_ref == REF_DYN_SEEN)
1502 1597 continue;
1503 1598
1504 1599 /*
1505 1600 * Calculate the size and alignment requirements for the global
1506 1601 * .bss and .tls sections. If we're building a relocatable
1507 1602 * object only account for scoped COMMON symbols (these will
1508 1603 * be converted to .bss references).
1509 1604 *
1510 1605 * When -z nopartial is in effect, partially initialized
1511 1606 * symbols are directed to the special .data section
1512 1607 * created for that purpose (ofl->ofl_isparexpn).
1513 1608 * Otherwise, partially initialized symbols go to .bss.
1514 1609 *
1515 1610 * Also refer to make_mvsections() in sunwmove.c
1516 1611 */
1517 1612 if ((sym->st_shndx == SHN_COMMON) &&
1518 1613 (((oflags & FLG_OF_RELOBJ) == 0) ||
1519 1614 (SYM_IS_HIDDEN(sdp) && (oflags & FLG_OF_PROCRED)))) {
1520 1615 if ((sdp->sd_move == NULL) ||
1521 1616 ((sdp->sd_flags & FLG_SY_PAREXPN) == 0)) {
1522 1617 if (type != STT_TLS) {
1523 1618 need_bss = TRUE;
1524 1619 bsssize = (Xword)S_ROUND(bsssize,
1525 1620 sym->st_value) + sym->st_size;
1526 1621 if (sym->st_value > bssalign)
1527 1622 bssalign = sym->st_value;
1528 1623 } else {
1529 1624 need_tlsbss = TRUE;
1530 1625 tlssize = (Xword)S_ROUND(tlssize,
1531 1626 sym->st_value) + sym->st_size;
1532 1627 if (sym->st_value > tlsalign)
1533 1628 tlsalign = sym->st_value;
1534 1629 }
1535 1630 }
1536 1631 }
1537 1632
1538 1633 #if defined(_ELF64)
1539 1634 /*
1540 1635 * Calculate the size and alignment requirement for the global
1541 1636 * .lbss. TLS or partially initialized symbols do not need to be
1542 1637 * considered yet.
1543 1638 */
1544 1639 if ((ld_targ.t_m.m_mach == EM_AMD64) &&
1545 1640 (sym->st_shndx == SHN_X86_64_LCOMMON)) {
1546 1641 need_lbss = TRUE;
1547 1642 lbsssize = (Xword)S_ROUND(lbsssize, sym->st_value) +
1548 1643 sym->st_size;
1549 1644 if (sym->st_value > lbssalign)
1550 1645 lbssalign = sym->st_value;
1551 1646 }
1552 1647 #endif
1553 1648 /*
1554 1649 * If a symbol was referenced via the command line
1555 1650 * (ld -u <>, ...), then this counts as a reference against the
1556 1651 * symbol. Mark any section that symbol is defined in.
1557 1652 */
1558 1653 if (((isp = sdp->sd_isc) != 0) &&
1559 1654 (sdp->sd_flags & FLG_SY_CMDREF)) {
1560 1655 isp->is_flags |= FLG_IS_SECTREF;
1561 1656 isp->is_file->ifl_flags |= FLG_IF_FILEREF;
1562 1657 }
1563 1658
1564 1659 /*
1565 1660 * Update the symbol count and the associated name string size.
1566 1661 * Note, a capabilities symbol must remain as visible as a
1567 1662 * global symbol. However, the runtime linker recognizes the
1568 1663 * hidden requirement and ensures the symbol isn't made globally
1569 1664 * available at runtime.
1570 1665 */
1571 1666 if (SYM_IS_HIDDEN(sdp) && (oflags & FLG_OF_PROCRED)) {
1572 1667 /*
1573 1668 * If any reductions are being processed, keep a count
1574 1669 * of eliminated symbols, and if the symbol is being
1575 1670 * reduced to local, count it's size for the .symtab.
1576 1671 */
1577 1672 if (sdp->sd_flags & FLG_SY_ELIM) {
1578 1673 ofl->ofl_elimcnt++;
1579 1674 } else {
1580 1675 ofl->ofl_scopecnt++;
1581 1676 if ((((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
1582 1677 sym->st_name) && (st_insert(ofl->ofl_strtab,
1583 1678 sdp->sd_name) == -1))
1584 1679 return (S_ERROR);
1585 1680 if (allow_ldynsym && sym->st_name &&
1586 1681 ldynsym_symtype[type]) {
1587 1682 ofl->ofl_dynscopecnt++;
1588 1683 if (st_insert(ofl->ofl_dynstrtab,
1589 1684 sdp->sd_name) == -1)
1590 1685 return (S_ERROR);
1591 1686 /* Include it in sort section? */
1592 1687 DYNSORT_COUNT(sdp, sym, type, ++);
1593 1688 }
1594 1689 }
1595 1690 } else {
1596 1691 ofl->ofl_globcnt++;
1597 1692
1598 1693 /*
1599 1694 * Check to see if this global variable should go into
1600 1695 * a sort section. Sort sections require a
1601 1696 * .SUNW_ldynsym section, so, don't check unless a
1602 1697 * .SUNW_ldynsym is allowed.
1603 1698 */
1604 1699 if (allow_ldynsym)
1605 1700 DYNSORT_COUNT(sdp, sym, type, ++);
1606 1701
1607 1702 /*
1608 1703 * If global direct bindings are in effect, or this
1609 1704 * symbol has bound to a dependency which was specified
1610 1705 * as requiring direct bindings, and it hasn't
1611 1706 * explicitly been defined as a non-direct binding
1612 1707 * symbol, mark it.
1613 1708 */
1614 1709 if (((ofl->ofl_dtflags_1 & DF_1_DIRECT) || (isp &&
1615 1710 (isp->is_file->ifl_flags & FLG_IF_DIRECT))) &&
1616 1711 ((sdp->sd_flags & FLG_SY_NDIR) == 0))
1617 1712 sdp->sd_flags |= FLG_SY_DIR;
1618 1713
1619 1714 /*
1620 1715 * Insert the symbol name.
1621 1716 */
1622 1717 if (((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
1623 1718 sym->st_name) {
1624 1719 if (st_insert(ofl->ofl_strtab,
1625 1720 sdp->sd_name) == -1)
1626 1721 return (S_ERROR);
1627 1722
1628 1723 if (!(ofl->ofl_flags & FLG_OF_RELOBJ) &&
1629 1724 (st_insert(ofl->ofl_dynstrtab,
1630 1725 sdp->sd_name) == -1))
1631 1726 return (S_ERROR);
1632 1727 }
1633 1728
1634 1729 /*
1635 1730 * If this section offers a global symbol - record that
1636 1731 * fact.
1637 1732 */
1638 1733 if (isp) {
1639 1734 isp->is_flags |= FLG_IS_SECTREF;
1640 1735 isp->is_file->ifl_flags |= FLG_IF_FILEREF;
1641 1736 }
1642 1737 }
1643 1738 }
1644 1739
1645 1740 /*
1646 1741 * Guidance: Use -z defs|nodefs when building shared objects.
1647 1742 *
1648 1743 * Our caller issues this, unless we mask it out here. So we mask it
1649 1744 * out unless we've issued at least one warnings or fatal error.
1650 1745 */
1651 1746 if (!((oflags & FLG_OF_SHAROBJ) && OFL_GUIDANCE(ofl, FLG_OFG_NO_DEFS) &&
1652 1747 (undef_state & (FLG_OF_FATAL | FLG_OF_WARN))))
1653 1748 ofl->ofl_guideflags |= FLG_OFG_NO_DEFS;
1654 1749
1655 1750 /*
1656 1751 * If we've encountered a fatal error during symbol validation then
1657 1752 * return now.
1658 1753 */
1659 1754 if (ofl->ofl_flags & FLG_OF_FATAL)
1660 1755 return (1);
1661 1756
1662 1757 /*
1663 1758 * Now that symbol resolution is completed, scan any register symbols.
1664 1759 * From now on, we're only interested in those that contribute to the
1665 1760 * output file.
1666 1761 */
1667 1762 if (ofl->ofl_regsyms) {
1668 1763 int ndx;
1669 1764
1670 1765 for (ndx = 0; ndx < ofl->ofl_regsymsno; ndx++) {
1671 1766 if ((sdp = ofl->ofl_regsyms[ndx]) == NULL)
1672 1767 continue;
1673 1768 if (sdp->sd_ref != REF_REL_NEED) {
1674 1769 ofl->ofl_regsyms[ndx] = NULL;
1675 1770 continue;
1676 1771 }
1677 1772
1678 1773 ofl->ofl_regsymcnt++;
1679 1774 if (sdp->sd_sym->st_name == 0)
1680 1775 sdp->sd_name = MSG_ORIG(MSG_STR_EMPTY);
1681 1776
1682 1777 if (SYM_IS_HIDDEN(sdp) ||
1683 1778 (ELF_ST_BIND(sdp->sd_sym->st_info) == STB_LOCAL))
1684 1779 ofl->ofl_lregsymcnt++;
1685 1780 }
1686 1781 }
1687 1782
1688 1783 /*
1689 1784 * Generate the .bss section now that we know its size and alignment.
1690 1785 */
1691 1786 if (need_bss) {
1692 1787 if (ld_make_bss(ofl, bsssize, bssalign,
1693 1788 ld_targ.t_id.id_bss) == S_ERROR)
1694 1789 return (S_ERROR);
1695 1790 }
1696 1791 if (need_tlsbss) {
1697 1792 if (ld_make_bss(ofl, tlssize, tlsalign,
1698 1793 ld_targ.t_id.id_tlsbss) == S_ERROR)
1699 1794 return (S_ERROR);
1700 1795 }
1701 1796 #if defined(_ELF64)
1702 1797 if ((ld_targ.t_m.m_mach == EM_AMD64) &&
1703 1798 need_lbss && !(oflags & FLG_OF_RELOBJ)) {
1704 1799 if (ld_make_bss(ofl, lbsssize, lbssalign,
1705 1800 ld_targ.t_id.id_lbss) == S_ERROR)
1706 1801 return (S_ERROR);
1707 1802 }
1708 1803 #endif
1709 1804 /*
1710 1805 * Determine what entry point symbol we need, and if found save its
1711 1806 * symbol descriptor so that we can update the ELF header entry with the
1712 1807 * symbols value later (see update_oehdr). Make sure the symbol is
1713 1808 * tagged to ensure its update in case -s is in effect. Use any -e
1714 1809 * option first, or the default entry points `_start' and `main'.
1715 1810 */
1716 1811 ret = 0;
1717 1812 if (ofl->ofl_entry) {
1718 1813 if ((sdp = ld_sym_find(ofl->ofl_entry, SYM_NOHASH,
1719 1814 NULL, ofl)) == NULL) {
1720 1815 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_ARG_NOENTRY),
1721 1816 ofl->ofl_entry);
1722 1817 ret++;
1723 1818 } else if (ensure_sym_local(ofl, sdp,
1724 1819 MSG_INTL(MSG_SYM_ENTRY)) != 0) {
1725 1820 ret++;
1726 1821 } else {
1727 1822 ofl->ofl_entry = (void *)sdp;
1728 1823 }
1729 1824 } else if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_START),
1730 1825 SYM_NOHASH, NULL, ofl)) != NULL) && (ensure_sym_local(ofl,
1731 1826 sdp, 0) == 0)) {
1732 1827 ofl->ofl_entry = (void *)sdp;
1733 1828
1734 1829 } else if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_MAIN),
1735 1830 SYM_NOHASH, NULL, ofl)) != NULL) && (ensure_sym_local(ofl,
1736 1831 sdp, 0) == 0)) {
1737 1832 ofl->ofl_entry = (void *)sdp;
1738 1833 }
1739 1834
1740 1835 /*
1741 1836 * If ld -zdtrace=<sym> was given, then validate that the symbol is
1742 1837 * defined within the current object being built.
1743 1838 */
1744 1839 if ((sdp = ofl->ofl_dtracesym) != 0)
1745 1840 ret += ensure_sym_local(ofl, sdp, MSG_ORIG(MSG_STR_DTRACE));
1746 1841
1747 1842 /*
1748 1843 * If any initarray, finiarray or preinitarray functions have been
1749 1844 * requested, make sure they are defined within the current object
1750 1845 * being built.
1751 1846 */
1752 1847 if (ofl->ofl_initarray) {
1753 1848 ret += ensure_array_local(ofl, ofl->ofl_initarray,
1754 1849 MSG_ORIG(MSG_SYM_INITARRAY));
1755 1850 }
1756 1851 if (ofl->ofl_finiarray) {
1757 1852 ret += ensure_array_local(ofl, ofl->ofl_finiarray,
1758 1853 MSG_ORIG(MSG_SYM_FINIARRAY));
1759 1854 }
1760 1855 if (ofl->ofl_preiarray) {
1761 1856 ret += ensure_array_local(ofl, ofl->ofl_preiarray,
1762 1857 MSG_ORIG(MSG_SYM_PREINITARRAY));
1763 1858 }
1764 1859
1765 1860 if (ret)
1766 1861 return (S_ERROR);
1767 1862
1768 1863 /*
1769 1864 * If we're required to record any needed dependencies versioning
1770 1865 * information calculate it now that all symbols have been validated.
1771 1866 */
1772 1867 if ((oflags & (FLG_OF_VERNEED | FLG_OF_NOVERSEC)) == FLG_OF_VERNEED)
1773 1868 return (ld_vers_check_need(ofl));
1774 1869 else
1775 1870 return (1);
1776 1871 }
1777 1872
1778 1873 /*
1779 1874 * qsort(3c) comparison function. As an optimization for associating weak
1780 1875 * symbols to their strong counterparts sort global symbols according to their
1781 1876 * section index, address and binding.
1782 1877 */
1783 1878 static int
1784 1879 compare(const void *sdpp1, const void *sdpp2)
1785 1880 {
1786 1881 Sym_desc *sdp1 = *((Sym_desc **)sdpp1);
1787 1882 Sym_desc *sdp2 = *((Sym_desc **)sdpp2);
1788 1883 Sym *sym1, *sym2;
1789 1884 uchar_t bind1, bind2;
1790 1885
1791 1886 /*
1792 1887 * Symbol descriptors may be zero, move these to the front of the
1793 1888 * sorted array.
1794 1889 */
1795 1890 if (sdp1 == NULL)
1796 1891 return (-1);
1797 1892 if (sdp2 == NULL)
1798 1893 return (1);
1799 1894
1800 1895 sym1 = sdp1->sd_sym;
1801 1896 sym2 = sdp2->sd_sym;
1802 1897
1803 1898 /*
1804 1899 * Compare the symbols section index. This is important when sorting
1805 1900 * the symbol tables of relocatable objects. In this case, a symbols
1806 1901 * value is the offset within the associated section, and thus many
1807 1902 * symbols can have the same value, but are effectively different
1808 1903 * addresses.
1809 1904 */
1810 1905 if (sym1->st_shndx > sym2->st_shndx)
1811 1906 return (1);
1812 1907 if (sym1->st_shndx < sym2->st_shndx)
1813 1908 return (-1);
1814 1909
1815 1910 /*
1816 1911 * Compare the symbols value (address).
1817 1912 */
1818 1913 if (sym1->st_value > sym2->st_value)
1819 1914 return (1);
1820 1915 if (sym1->st_value < sym2->st_value)
1821 1916 return (-1);
1822 1917
1823 1918 bind1 = ELF_ST_BIND(sym1->st_info);
1824 1919 bind2 = ELF_ST_BIND(sym2->st_info);
1825 1920
1826 1921 /*
1827 1922 * If two symbols have the same address place the weak symbol before
1828 1923 * any strong counterpart.
1829 1924 */
1830 1925 if (bind1 > bind2)
1831 1926 return (-1);
1832 1927 if (bind1 < bind2)
1833 1928 return (1);
1834 1929
1835 1930 return (0);
1836 1931 }
1837 1932
1838 1933 /*
1839 1934 * Issue a MSG_SYM_BADADDR error from ld_sym_process(). This error
1840 1935 * is issued when a symbol address/size is not contained by the
1841 1936 * target section.
1842 1937 *
1843 1938 * Such objects are at least partially corrupt, and the user would
1844 1939 * be well advised to be skeptical of them, and to ask their compiler
1845 1940 * supplier to fix the problem. However, a distinction needs to be
1846 1941 * made between symbols that reference readonly text, and those that
1847 1942 * access writable data. Other than throwing off profiling results,
1848 1943 * the readonly section case is less serious. We have encountered
1849 1944 * such objects in the field. In order to allow existing objects
1850 1945 * to continue working, we issue a warning rather than a fatal error
1851 1946 * if the symbol is against readonly text. Other cases are fatal.
1852 1947 */
1853 1948 static void
1854 1949 issue_badaddr_msg(Ifl_desc *ifl, Ofl_desc *ofl, Sym_desc *sdp,
1855 1950 Sym *sym, Word shndx)
1856 1951 {
1857 1952 Error err;
1858 1953 const char *msg;
1859 1954
1860 1955 if ((sdp->sd_isc->is_shdr->sh_flags & (SHF_WRITE | SHF_ALLOC)) ==
1861 1956 SHF_ALLOC) {
1862 1957 msg = MSG_INTL(MSG_SYM_BADADDR_ROTXT);
1863 1958 err = ERR_WARNING;
1864 1959 } else {
1865 1960 msg = MSG_INTL(MSG_SYM_BADADDR);
1866 1961 err = ERR_FATAL;
1867 1962 }
1868 1963
1869 1964 ld_eprintf(ofl, err, msg, demangle(sdp->sd_name),
1870 1965 ifl->ifl_name, shndx, sdp->sd_isc->is_name,
1871 1966 EC_XWORD(sdp->sd_isc->is_shdr->sh_size),
1872 1967 EC_XWORD(sym->st_value), EC_XWORD(sym->st_size));
1873 1968 }
1874 1969
1875 1970 /*
1876 1971 * Global symbols that are candidates for translation to local capability
1877 1972 * symbols under -z symbolcap, are maintained on a local symbol list. Once
1878 1973 * all symbols of a file are processed, this list is traversed to cull any
1879 1974 * unnecessary weak symbol aliases.
1880 1975 */
1881 1976 typedef struct {
1882 1977 Sym_desc *c_nsdp; /* new lead symbol */
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1883 1978 Sym_desc *c_osdp; /* original symbol */
1884 1979 Cap_group *c_group; /* symbol capability group */
1885 1980 Word c_ndx; /* symbol index */
1886 1981 } Cap_pair;
1887 1982
1888 1983 /*
1889 1984 * Process the symbol table for the specified input file. At this point all
1890 1985 * input sections from this input file have been assigned an input section
1891 1986 * descriptor which is saved in the `ifl_isdesc' array.
1892 1987 *
1893 - * - local symbols are saved (as is) if the input file is a relocatable
1988 + * - local symbols are saved (as is) if the input file is a relocatable
1894 1989 * object
1895 1990 *
1896 1991 * - global symbols are added to the linkers internal symbol table if they
1897 1992 * are not already present, otherwise a symbol resolution function is
1898 1993 * called upon to resolve the conflict.
1899 1994 */
1900 1995 uintptr_t
1901 1996 ld_sym_process(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl)
1902 1997 {
1903 1998 /*
1904 1999 * This macro tests the given symbol to see if it is out of
1905 2000 * range relative to the section it references.
1906 2001 *
1907 2002 * entry:
1908 2003 * - ifl is a relative object (ET_REL)
1909 2004 * _sdp - Symbol descriptor
1910 2005 * _sym - Symbol
1911 2006 * _type - Symbol type
1912 2007 *
1913 2008 * The following are tested:
1914 2009 * - Symbol length is non-zero
1915 2010 * - Symbol type is a type that references code or data
1916 2011 * - Referenced section is not 0 (indicates an UNDEF symbol)
1917 2012 * and is not in the range of special values above SHN_LORESERVE
1918 2013 * (excluding SHN_XINDEX, which is OK).
1919 2014 * - We have a valid section header for the target section
1920 2015 *
1921 2016 * If the above are all true, and the symbol position is not
1922 2017 * contained by the target section, this macro evaluates to
1923 2018 * True (1). Otherwise, False(0).
1924 2019 */
1925 2020 #define SYM_LOC_BADADDR(_sdp, _sym, _type) \
1926 2021 (_sym->st_size && dynsymsort_symtype[_type] && \
1927 2022 (_sym->st_shndx != SHN_UNDEF) && \
1928 2023 ((_sym->st_shndx < SHN_LORESERVE) || \
1929 2024 (_sym->st_shndx == SHN_XINDEX)) && \
1930 2025 _sdp->sd_isc && _sdp->sd_isc->is_shdr && \
1931 2026 ((_sym->st_value + _sym->st_size) > _sdp->sd_isc->is_shdr->sh_size))
1932 2027
1933 2028 Conv_inv_buf_t inv_buf;
1934 2029 Sym *sym = (Sym *)isc->is_indata->d_buf;
1935 2030 Word *symshndx = NULL;
1936 2031 Shdr *shdr = isc->is_shdr;
1937 2032 Sym_desc *sdp;
1938 2033 size_t strsize;
1939 2034 char *strs;
1940 2035 uchar_t type, bind;
1941 2036 Word ndx, hash, local, total;
1942 2037 uchar_t osabi = ifl->ifl_ehdr->e_ident[EI_OSABI];
1943 2038 Half mach = ifl->ifl_ehdr->e_machine;
1944 2039 Half etype = ifl->ifl_ehdr->e_type;
1945 2040 int etype_rel;
1946 2041 const char *symsecname, *strsecname;
1947 2042 Word symsecndx;
1948 2043 avl_index_t where;
1949 2044 int test_gnu_hidden_bit, weak;
1950 2045 Cap_desc *cdp = NULL;
1951 2046 Alist *cappairs = NULL;
1952 2047
1953 2048 /*
1954 2049 * Its possible that a file may contain more that one symbol table,
1955 2050 * ie. .dynsym and .symtab in a shared library. Only process the first
1956 2051 * table (here, we assume .dynsym comes before .symtab).
1957 2052 */
1958 2053 if (ifl->ifl_symscnt)
1959 2054 return (1);
1960 2055
1961 2056 if (isc->is_symshndx)
1962 2057 symshndx = isc->is_symshndx->is_indata->d_buf;
1963 2058
1964 2059 DBG_CALL(Dbg_syms_process(ofl->ofl_lml, ifl));
1965 2060
1966 2061 symsecndx = isc->is_scnndx;
1967 2062 if (isc->is_name)
1968 2063 symsecname = isc->is_name;
1969 2064 else
1970 2065 symsecname = MSG_ORIG(MSG_STR_EMPTY);
1971 2066
1972 2067 /*
1973 2068 * From the symbol tables section header information determine which
1974 2069 * strtab table is needed to locate the actual symbol names.
1975 2070 */
1976 2071 if (ifl->ifl_flags & FLG_IF_HSTRTAB) {
1977 2072 ndx = shdr->sh_link;
1978 2073 if ((ndx == 0) || (ndx >= ifl->ifl_shnum)) {
1979 2074 ld_eprintf(ofl, ERR_FATAL,
1980 2075 MSG_INTL(MSG_FIL_INVSHLINK), ifl->ifl_name,
1981 2076 EC_WORD(symsecndx), symsecname, EC_XWORD(ndx));
1982 2077 return (S_ERROR);
1983 2078 }
1984 2079 strsize = ifl->ifl_isdesc[ndx]->is_shdr->sh_size;
1985 2080 strs = ifl->ifl_isdesc[ndx]->is_indata->d_buf;
1986 2081 if (ifl->ifl_isdesc[ndx]->is_name)
1987 2082 strsecname = ifl->ifl_isdesc[ndx]->is_name;
1988 2083 else
1989 2084 strsecname = MSG_ORIG(MSG_STR_EMPTY);
1990 2085 } else {
1991 2086 /*
1992 2087 * There is no string table section in this input file
1993 2088 * although there are symbols in this symbol table section.
1994 2089 * This means that these symbols do not have names.
1995 2090 * Currently, only scratch register symbols are allowed
1996 2091 * not to have names.
1997 2092 */
1998 2093 strsize = 0;
1999 2094 strs = (char *)MSG_ORIG(MSG_STR_EMPTY);
2000 2095 strsecname = MSG_ORIG(MSG_STR_EMPTY);
2001 2096 }
2002 2097
2003 2098 /*
2004 2099 * Determine the number of local symbols together with the total
2005 2100 * number we have to process.
2006 2101 */
2007 2102 total = (Word)(shdr->sh_size / shdr->sh_entsize);
2008 2103 local = shdr->sh_info;
2009 2104
2010 2105 /*
2011 2106 * Allocate a symbol table index array and a local symbol array
2012 2107 * (global symbols are processed and added to the ofl->ofl_symbkt[]
2013 2108 * array). If we are dealing with a relocatable object, allocate the
2014 2109 * local symbol descriptors. If this isn't a relocatable object we
2015 2110 * still have to process any shared object locals to determine if any
2016 2111 * register symbols exist. Although these aren't added to the output
2017 2112 * image, they are used as part of symbol resolution.
2018 2113 */
2019 2114 if ((ifl->ifl_oldndx = libld_malloc((size_t)(total *
2020 2115 sizeof (Sym_desc *)))) == NULL)
2021 2116 return (S_ERROR);
2022 2117 etype_rel = (etype == ET_REL);
2023 2118 if (etype_rel && local) {
2024 2119 if ((ifl->ifl_locs =
2025 2120 libld_calloc(sizeof (Sym_desc), local)) == NULL)
2026 2121 return (S_ERROR);
2027 2122 /* LINTED */
2028 2123 ifl->ifl_locscnt = (Word)local;
2029 2124 }
2030 2125 ifl->ifl_symscnt = total;
2031 2126
2032 2127 /*
2033 2128 * If there are local symbols to save add them to the symbol table
2034 2129 * index array.
2035 2130 */
2036 2131 if (local) {
2037 2132 int allow_ldynsym = OFL_ALLOW_LDYNSYM(ofl);
2038 2133 Sym_desc *last_file_sdp = NULL;
2039 2134 int last_file_ndx = 0;
2040 2135
2041 2136 for (sym++, ndx = 1; ndx < local; sym++, ndx++) {
2042 2137 sd_flag_t sdflags = FLG_SY_CLEAN;
2043 2138 Word shndx;
2044 2139 const char *name;
2045 2140 Sym_desc *rsdp;
2046 2141 int shndx_bad = 0;
2047 2142 int symtab_enter = 1;
2048 2143
2049 2144 /*
2050 2145 * Determine and validate the associated section index.
2051 2146 */
2052 2147 if (symshndx && (sym->st_shndx == SHN_XINDEX)) {
2053 2148 shndx = symshndx[ndx];
2054 2149 } else if ((shndx = sym->st_shndx) >= SHN_LORESERVE) {
2055 2150 sdflags |= FLG_SY_SPECSEC;
2056 2151 } else if (shndx > ifl->ifl_shnum) {
2057 2152 /* We need the name before we can issue error */
2058 2153 shndx_bad = 1;
2059 2154 }
2060 2155
2061 2156 /*
2062 2157 * Check if st_name has a valid value or not.
2063 2158 */
2064 2159 if ((name = string(ofl, ifl, sym, strs, strsize, ndx,
2065 2160 shndx, symsecndx, symsecname, strsecname,
2066 2161 &sdflags)) == NULL)
2067 2162 continue;
2068 2163
2069 2164 /*
2070 2165 * Now that we have the name, if the section index
2071 2166 * was bad, report it.
2072 2167 */
2073 2168 if (shndx_bad) {
2074 2169 ld_eprintf(ofl, ERR_WARNING,
2075 2170 MSG_INTL(MSG_SYM_INVSHNDX),
2076 2171 demangle_symname(name, symsecname, ndx),
2077 2172 ifl->ifl_name,
2078 2173 conv_sym_shndx(osabi, mach, sym->st_shndx,
2079 2174 CONV_FMT_DECIMAL, &inv_buf));
2080 2175 continue;
2081 2176 }
2082 2177
2083 2178 /*
2084 2179 * If this local symbol table originates from a shared
2085 2180 * object, then we're only interested in recording
2086 2181 * register symbols. As local symbol descriptors aren't
2087 2182 * allocated for shared objects, one will be allocated
2088 2183 * to associated with the register symbol. This symbol
2089 2184 * won't become part of the output image, but we must
2090 2185 * process it to test for register conflicts.
2091 2186 */
2092 2187 rsdp = sdp = NULL;
2093 2188 if (sdflags & FLG_SY_REGSYM) {
2094 2189 /*
2095 2190 * The presence of FLG_SY_REGSYM means that
2096 2191 * the pointers in ld_targ.t_ms are non-NULL.
2097 2192 */
2098 2193 rsdp = (*ld_targ.t_ms.ms_reg_find)(sym, ofl);
2099 2194 if (rsdp != 0) {
2100 2195 /*
2101 2196 * The fact that another register def-
2102 2197 * inition has been found is fatal.
2103 2198 * Call the verification routine to get
2104 2199 * the error message and move on.
2105 2200 */
2106 2201 (void) (*ld_targ.t_ms.ms_reg_check)
2107 2202 (rsdp, sym, name, ifl, ofl);
2108 2203 continue;
2109 2204 }
2110 2205
2111 2206 if (etype == ET_DYN) {
2112 2207 if ((sdp = libld_calloc(
2113 2208 sizeof (Sym_desc), 1)) == NULL)
2114 2209 return (S_ERROR);
2115 2210 sdp->sd_ref = REF_DYN_SEEN;
2116 2211
2117 2212 /* Will not appear in output object */
2118 2213 symtab_enter = 0;
2119 2214 }
2120 2215 } else if (etype == ET_DYN)
2121 2216 continue;
2122 2217
2123 2218 /*
2124 2219 * Fill in the remaining symbol descriptor information.
2125 2220 */
2126 2221 if (sdp == NULL) {
2127 2222 sdp = &(ifl->ifl_locs[ndx]);
2128 2223 sdp->sd_ref = REF_REL_NEED;
2129 2224 sdp->sd_symndx = ndx;
2130 2225 }
2131 2226 if (rsdp == NULL) {
2132 2227 sdp->sd_name = name;
2133 2228 sdp->sd_sym = sym;
2134 2229 sdp->sd_shndx = shndx;
2135 2230 sdp->sd_flags = sdflags;
2136 2231 sdp->sd_file = ifl;
2137 2232 ifl->ifl_oldndx[ndx] = sdp;
2138 2233 }
2139 2234
2140 2235 DBG_CALL(Dbg_syms_entry(ofl->ofl_lml, ndx, sdp));
2141 2236
2142 2237 /*
2143 2238 * Reclassify any SHN_SUNW_IGNORE symbols to SHN_UNDEF
2144 2239 * so as to simplify future processing.
2145 2240 */
2146 2241 if (sym->st_shndx == SHN_SUNW_IGNORE) {
2147 2242 sdp->sd_shndx = shndx = SHN_UNDEF;
2148 2243 sdp->sd_flags |= (FLG_SY_IGNORE | FLG_SY_ELIM);
2149 2244 }
2150 2245
2151 2246 /*
2152 2247 * Process any register symbols.
2153 2248 */
2154 2249 if (sdp->sd_flags & FLG_SY_REGSYM) {
2155 2250 /*
2156 2251 * Add a diagnostic to indicate we've caught a
2157 2252 * register symbol, as this can be useful if a
2158 2253 * register conflict is later discovered.
2159 2254 */
2160 2255 DBG_CALL(Dbg_syms_entered(ofl, sym, sdp));
2161 2256
2162 2257 /*
2163 2258 * If this register symbol hasn't already been
2164 2259 * recorded, enter it now.
2165 2260 *
2166 2261 * The presence of FLG_SY_REGSYM means that
2167 2262 * the pointers in ld_targ.t_ms are non-NULL.
2168 2263 */
2169 2264 if ((rsdp == NULL) &&
2170 2265 ((*ld_targ.t_ms.ms_reg_enter)(sdp, ofl) ==
2171 2266 0))
2172 2267 return (S_ERROR);
2173 2268 }
2174 2269
2175 2270 /*
2176 2271 * Assign an input section.
2177 2272 */
2178 2273 if ((sym->st_shndx != SHN_UNDEF) &&
2179 2274 ((sdp->sd_flags & FLG_SY_SPECSEC) == 0))
2180 2275 sdp->sd_isc = ifl->ifl_isdesc[shndx];
2181 2276
2182 2277 /*
2183 2278 * If this symbol falls within the range of a section
2184 2279 * being discarded, then discard the symbol itself.
2185 2280 * There is no reason to keep this local symbol.
2186 2281 */
2187 2282 if (sdp->sd_isc &&
2188 2283 (sdp->sd_isc->is_flags & FLG_IS_DISCARD)) {
2189 2284 sdp->sd_flags |= FLG_SY_ISDISC;
2190 2285 DBG_CALL(Dbg_syms_discarded(ofl->ofl_lml, sdp));
2191 2286 continue;
2192 2287 }
2193 2288
2194 2289 /*
2195 2290 * Skip any section symbols as new versions of these
2196 2291 * will be created.
2197 2292 */
2198 2293 if ((type = ELF_ST_TYPE(sym->st_info)) == STT_SECTION) {
2199 2294 if (sym->st_shndx == SHN_UNDEF) {
2200 2295 ld_eprintf(ofl, ERR_WARNING,
2201 2296 MSG_INTL(MSG_SYM_INVSHNDX),
2202 2297 demangle_symname(name, symsecname,
2203 2298 ndx), ifl->ifl_name,
2204 2299 conv_sym_shndx(osabi, mach,
2205 2300 sym->st_shndx, CONV_FMT_DECIMAL,
2206 2301 &inv_buf));
2207 2302 }
2208 2303 continue;
2209 2304 }
2210 2305
2211 2306 /*
2212 2307 * For a relocatable object, if this symbol is defined
2213 2308 * and has non-zero length and references an address
2214 2309 * within an associated section, then check its extents
2215 2310 * to make sure the section boundaries encompass it.
2216 2311 * If they don't, the ELF file is corrupt.
2217 2312 */
2218 2313 if (etype_rel) {
2219 2314 if (SYM_LOC_BADADDR(sdp, sym, type)) {
2220 2315 issue_badaddr_msg(ifl, ofl, sdp,
2221 2316 sym, shndx);
2222 2317 if (ofl->ofl_flags & FLG_OF_FATAL)
2223 2318 continue;
2224 2319 }
2225 2320
2226 2321 /*
2227 2322 * We have observed relocatable objects
2228 2323 * containing identical adjacent STT_FILE
2229 2324 * symbols. Discard any other than the first,
2230 2325 * as they are all equivalent and the extras
2231 2326 * do not add information.
2232 2327 *
2233 2328 * For the purpose of this test, we assume
2234 2329 * that only the symbol type and the string
2235 2330 * table offset (st_name) matter.
2236 2331 */
2237 2332 if (type == STT_FILE) {
2238 2333 int toss = (last_file_sdp != NULL) &&
2239 2334 ((ndx - 1) == last_file_ndx) &&
2240 2335 (sym->st_name ==
2241 2336 last_file_sdp->sd_sym->st_name);
2242 2337
2243 2338 last_file_sdp = sdp;
2244 2339 last_file_ndx = ndx;
2245 2340 if (toss) {
2246 2341 sdp->sd_flags |= FLG_SY_INVALID;
2247 2342 DBG_CALL(Dbg_syms_dup_discarded(
2248 2343 ofl->ofl_lml, ndx, sdp));
2249 2344 continue;
2250 2345 }
2251 2346 }
2252 2347 }
2253 2348
2254 2349
2255 2350 /*
2256 2351 * Sanity check for TLS
2257 2352 */
2258 2353 if ((sym->st_size != 0) && ((type == STT_TLS) &&
2259 2354 (sym->st_shndx != SHN_COMMON))) {
2260 2355 Is_desc *isp = sdp->sd_isc;
2261 2356
2262 2357 if ((isp == NULL) || (isp->is_shdr == NULL) ||
2263 2358 ((isp->is_shdr->sh_flags & SHF_TLS) == 0)) {
2264 2359 ld_eprintf(ofl, ERR_FATAL,
2265 2360 MSG_INTL(MSG_SYM_TLS),
2266 2361 demangle(sdp->sd_name),
2267 2362 ifl->ifl_name);
2268 2363 continue;
2269 2364 }
2270 2365 }
2271 2366
2272 2367 /*
2273 2368 * Carry our some basic sanity checks (these are just
2274 2369 * some of the erroneous symbol entries we've come
2275 2370 * across, there's probably a lot more). The symbol
2276 2371 * will not be carried forward to the output file, which
2277 2372 * won't be a problem unless a relocation is required
2278 2373 * against it.
2279 2374 */
2280 2375 if (((sdp->sd_flags & FLG_SY_SPECSEC) &&
2281 2376 ((sym->st_shndx == SHN_COMMON)) ||
2282 2377 ((type == STT_FILE) &&
2283 2378 (sym->st_shndx != SHN_ABS))) ||
2284 2379 (sdp->sd_isc && (sdp->sd_isc->is_osdesc == NULL))) {
2285 2380 ld_eprintf(ofl, ERR_WARNING,
2286 2381 MSG_INTL(MSG_SYM_INVSHNDX),
2287 2382 demangle_symname(name, symsecname, ndx),
2288 2383 ifl->ifl_name,
2289 2384 conv_sym_shndx(osabi, mach, sym->st_shndx,
2290 2385 CONV_FMT_DECIMAL, &inv_buf));
2291 2386 sdp->sd_isc = NULL;
2292 2387 sdp->sd_flags |= FLG_SY_INVALID;
2293 2388 continue;
2294 2389 }
2295 2390
2296 2391 /*
2297 2392 * As these local symbols will become part of the output
2298 2393 * image, record their number and name string size.
2299 2394 * Globals are counted after all input file processing
2300 2395 * (and hence symbol resolution) is complete during
2301 2396 * sym_validate().
2302 2397 */
2303 2398 if (!(ofl->ofl_flags & FLG_OF_REDLSYM) &&
2304 2399 symtab_enter) {
2305 2400 ofl->ofl_locscnt++;
2306 2401
2307 2402 if ((((sdp->sd_flags & FLG_SY_REGSYM) == 0) ||
2308 2403 sym->st_name) && (st_insert(ofl->ofl_strtab,
2309 2404 sdp->sd_name) == -1))
2310 2405 return (S_ERROR);
2311 2406
2312 2407 if (allow_ldynsym && sym->st_name &&
2313 2408 ldynsym_symtype[type]) {
2314 2409 ofl->ofl_dynlocscnt++;
2315 2410 if (st_insert(ofl->ofl_dynstrtab,
2316 2411 sdp->sd_name) == -1)
2317 2412 return (S_ERROR);
2318 2413 /* Include it in sort section? */
2319 2414 DYNSORT_COUNT(sdp, sym, type, ++);
2320 2415 }
2321 2416 }
2322 2417 }
2323 2418 }
2324 2419
2325 2420 /*
2326 2421 * The GNU ld interprets the top bit of the 16-bit Versym value
2327 2422 * (0x8000) as the "hidden" bit. If this bit is set, the linker
2328 2423 * is supposed to act as if that symbol does not exist. The Solaris
2329 2424 * linker does not support this mechanism, or the model of interface
2330 2425 * evolution that it allows, but we honor it in GNU ld produced
2331 2426 * objects in order to interoperate with them.
2332 2427 *
2333 2428 * Determine if we should honor the GNU hidden bit for this file.
2334 2429 */
2335 2430 test_gnu_hidden_bit = ((ifl->ifl_flags & FLG_IF_GNUVER) != 0) &&
2336 2431 (ifl->ifl_versym != NULL);
2337 2432
2338 2433 /*
2339 2434 * Determine whether object capabilities for this file are being
2340 2435 * converted into symbol capabilities. If so, global function symbols,
2341 2436 * and initialized global data symbols, need special translation and
2342 2437 * processing.
2343 2438 */
2344 2439 if ((etype == ET_REL) && (ifl->ifl_flags & FLG_IF_OTOSCAP))
2345 2440 cdp = ifl->ifl_caps;
2346 2441
2347 2442 /*
2348 2443 * Now scan the global symbols entering them in the internal symbol
2349 2444 * table or resolving them as necessary.
2350 2445 */
2351 2446 sym = (Sym *)isc->is_indata->d_buf;
2352 2447 sym += local;
2353 2448 weak = 0;
2354 2449 /* LINTED */
2355 2450 for (ndx = (int)local; ndx < total; sym++, ndx++) {
2356 2451 const char *name;
2357 2452 sd_flag_t sdflags = 0;
2358 2453 Word shndx;
2359 2454 int shndx_bad = 0;
2360 2455 Sym *nsym = sym;
2361 2456 Cap_pair *cpp = NULL;
2362 2457 uchar_t ntype;
2363 2458
2364 2459 /*
2365 2460 * Determine and validate the associated section index.
2366 2461 */
2367 2462 if (symshndx && (nsym->st_shndx == SHN_XINDEX)) {
2368 2463 shndx = symshndx[ndx];
2369 2464 } else if ((shndx = nsym->st_shndx) >= SHN_LORESERVE) {
2370 2465 sdflags |= FLG_SY_SPECSEC;
2371 2466 } else if (shndx > ifl->ifl_shnum) {
2372 2467 /* We need the name before we can issue error */
2373 2468 shndx_bad = 1;
2374 2469 }
2375 2470
2376 2471 /*
2377 2472 * Check if st_name has a valid value or not.
2378 2473 */
2379 2474 if ((name = string(ofl, ifl, nsym, strs, strsize, ndx, shndx,
2380 2475 symsecndx, symsecname, strsecname, &sdflags)) == NULL)
2381 2476 continue;
2382 2477
2383 2478 /*
2384 2479 * Now that we have the name, report an erroneous section index.
2385 2480 */
2386 2481 if (shndx_bad) {
2387 2482 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_INVSHNDX),
2388 2483 demangle_symname(name, symsecname, ndx),
2389 2484 ifl->ifl_name,
2390 2485 conv_sym_shndx(osabi, mach, nsym->st_shndx,
2391 2486 CONV_FMT_DECIMAL, &inv_buf));
2392 2487 continue;
2393 2488 }
2394 2489
2395 2490 /*
2396 2491 * Test for the GNU hidden bit, and ignore symbols that
2397 2492 * have it set.
2398 2493 */
2399 2494 if (test_gnu_hidden_bit &&
2400 2495 ((ifl->ifl_versym[ndx] & 0x8000) != 0))
2401 2496 continue;
2402 2497
2403 2498 /*
2404 2499 * The linker itself will generate symbols for _end, _etext,
2405 2500 * _edata, _DYNAMIC and _PROCEDURE_LINKAGE_TABLE_, so don't
2406 2501 * bother entering these symbols from shared objects. This
2407 2502 * results in some wasted resolution processing, which is hard
2408 2503 * to feel, but if nothing else, pollutes diagnostic relocation
2409 2504 * output.
2410 2505 */
2411 2506 if (name[0] && (etype == ET_DYN) && (nsym->st_size == 0) &&
2412 2507 (ELF_ST_TYPE(nsym->st_info) == STT_OBJECT) &&
2413 2508 (name[0] == '_') && ((name[1] == 'e') ||
2414 2509 (name[1] == 'D') || (name[1] == 'P')) &&
2415 2510 ((strcmp(name, MSG_ORIG(MSG_SYM_ETEXT_U)) == 0) ||
2416 2511 (strcmp(name, MSG_ORIG(MSG_SYM_EDATA_U)) == 0) ||
2417 2512 (strcmp(name, MSG_ORIG(MSG_SYM_END_U)) == 0) ||
2418 2513 (strcmp(name, MSG_ORIG(MSG_SYM_DYNAMIC_U)) == 0) ||
2419 2514 (strcmp(name, MSG_ORIG(MSG_SYM_PLKTBL_U)) == 0))) {
2420 2515 ifl->ifl_oldndx[ndx] = 0;
2421 2516 continue;
2422 2517 }
2423 2518
2424 2519 /*
2425 2520 * The '-z wrap=XXX' option emulates the GNU ld --wrap=XXX
2426 2521 * option. When XXX is the symbol to be wrapped:
2427 2522 *
2428 2523 * - An undefined reference to XXX is converted to __wrap_XXX
2429 2524 * - An undefined reference to __real_XXX is converted to XXX
2430 2525 *
2431 2526 * The idea is that the user can supply a wrapper function
2432 2527 * __wrap_XXX that does some work, and then uses the name
2433 2528 * __real_XXX to pass the call on to the real function. The
2434 2529 * wrapper objects are linked with the original unmodified
2435 2530 * objects to produce a wrapped version of the output object.
2436 2531 */
2437 2532 if (ofl->ofl_wrap && name[0] && (shndx == SHN_UNDEF)) {
2438 2533 WrapSymNode wsn, *wsnp;
2439 2534
2440 2535 /*
2441 2536 * If this is the __real_XXX form, advance the
2442 2537 * pointer to reference the wrapped name.
2443 2538 */
2444 2539 wsn.wsn_name = name;
2445 2540 if ((*name == '_') &&
2446 2541 (strncmp(name, MSG_ORIG(MSG_STR_UU_REAL_U),
2447 2542 MSG_STR_UU_REAL_U_SIZE) == 0))
2448 2543 wsn.wsn_name += MSG_STR_UU_REAL_U_SIZE;
2449 2544
2450 2545 /*
2451 2546 * Is this symbol in the wrap AVL tree? If so, map
2452 2547 * XXX to __wrap_XXX, and __real_XXX to XXX. Note that
2453 2548 * wsn.wsn_name will equal the current value of name
2454 2549 * if the __real_ prefix is not present.
2455 2550 */
2456 2551 if ((wsnp = avl_find(ofl->ofl_wrap, &wsn, 0)) != NULL) {
2457 2552 const char *old_name = name;
2458 2553
2459 2554 name = (wsn.wsn_name == name) ?
2460 2555 wsnp->wsn_wrapname : wsn.wsn_name;
2461 2556 DBG_CALL(Dbg_syms_wrap(ofl->ofl_lml, ndx,
2462 2557 old_name, name));
2463 2558 }
2464 2559 }
2465 2560
2466 2561 /*
2467 2562 * Determine and validate the symbols binding.
2468 2563 */
2469 2564 bind = ELF_ST_BIND(nsym->st_info);
2470 2565 if ((bind != STB_GLOBAL) && (bind != STB_WEAK)) {
2471 2566 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_SYM_NONGLOB),
2472 2567 demangle_symname(name, symsecname, ndx),
2473 2568 ifl->ifl_name,
2474 2569 conv_sym_info_bind(bind, 0, &inv_buf));
2475 2570 continue;
2476 2571 }
2477 2572 if (bind == STB_WEAK)
2478 2573 weak++;
2479 2574
2480 2575 /*
2481 2576 * If this symbol falls within the range of a section being
2482 2577 * discarded, then discard the symbol itself.
2483 2578 */
2484 2579 if (((sdflags & FLG_SY_SPECSEC) == 0) &&
2485 2580 (nsym->st_shndx != SHN_UNDEF)) {
2486 2581 Is_desc *isp;
2487 2582
2488 2583 if (shndx >= ifl->ifl_shnum) {
2489 2584 /*
2490 2585 * Carry our some basic sanity checks
2491 2586 * The symbol will not be carried forward to
2492 2587 * the output file, which won't be a problem
2493 2588 * unless a relocation is required against it.
2494 2589 */
2495 2590 ld_eprintf(ofl, ERR_WARNING,
2496 2591 MSG_INTL(MSG_SYM_INVSHNDX),
2497 2592 demangle_symname(name, symsecname, ndx),
2498 2593 ifl->ifl_name,
2499 2594 conv_sym_shndx(osabi, mach, nsym->st_shndx,
2500 2595 CONV_FMT_DECIMAL, &inv_buf));
2501 2596 continue;
2502 2597 }
2503 2598
2504 2599 isp = ifl->ifl_isdesc[shndx];
2505 2600 if (isp && (isp->is_flags & FLG_IS_DISCARD)) {
2506 2601 if ((sdp =
2507 2602 libld_calloc(sizeof (Sym_desc), 1)) == NULL)
2508 2603 return (S_ERROR);
2509 2604
2510 2605 /*
2511 2606 * Create a dummy symbol entry so that if we
2512 2607 * find any references to this discarded symbol
2513 2608 * we can compensate.
2514 2609 */
2515 2610 sdp->sd_name = name;
2516 2611 sdp->sd_sym = nsym;
2517 2612 sdp->sd_file = ifl;
2518 2613 sdp->sd_isc = isp;
2519 2614 sdp->sd_flags = FLG_SY_ISDISC;
2520 2615 ifl->ifl_oldndx[ndx] = sdp;
2521 2616
2522 2617 DBG_CALL(Dbg_syms_discarded(ofl->ofl_lml, sdp));
2523 2618 continue;
2524 2619 }
2525 2620 }
2526 2621
2527 2622 /*
2528 2623 * If object capabilities for this file are being converted
2529 2624 * into symbol capabilities, then:
2530 2625 *
2531 2626 * - Any global function, or initialized global data symbol
2532 2627 * definitions (ie., those that are not associated with
2533 2628 * special symbol types, ie., ABS, COMMON, etc.), and which
2534 2629 * have not been reduced to locals, are converted to symbol
2535 2630 * references (UNDEF). This ensures that any reference to
2536 2631 * the original symbol, for example from a relocation, get
2537 2632 * associated to a capabilities family lead symbol, ie., a
2538 2633 * generic instance.
2539 2634 *
2540 2635 * - For each global function, or object symbol definition,
2541 2636 * a new local symbol is created. The function or object
2542 2637 * is renamed using the capabilities CA_SUNW_ID definition
2543 2638 * (which might have been fabricated for this purpose -
2544 2639 * see get_cap_group()). The new symbol name is:
2545 2640 *
2546 2641 * <original name>%<capability group identifier>
2547 2642 *
2548 2643 * This symbol is associated to the same location, and
2549 2644 * becomes a capabilities family member.
2550 2645 */
2551 2646 /* LINTED */
2552 2647 hash = (Word)elf_hash(name);
2553 2648
2554 2649 ntype = ELF_ST_TYPE(nsym->st_info);
2555 2650 if (cdp && (nsym->st_shndx != SHN_UNDEF) &&
2556 2651 ((sdflags & FLG_SY_SPECSEC) == 0) &&
2557 2652 ((ntype == STT_FUNC) || (ntype == STT_OBJECT))) {
2558 2653 /*
2559 2654 * Determine this symbol's visibility. If a mapfile has
2560 2655 * indicated this symbol should be local, then there's
2561 2656 * no point in transforming this global symbol to a
2562 2657 * capabilities symbol. Otherwise, create a symbol
2563 2658 * capability pair descriptor to record this symbol as
2564 2659 * a candidate for translation.
2565 2660 */
2566 2661 if (sym_cap_vis(name, hash, sym, ofl) &&
2567 2662 ((cpp = alist_append(&cappairs, NULL,
2568 2663 sizeof (Cap_pair), AL_CNT_CAP_PAIRS)) == NULL))
2569 2664 return (S_ERROR);
2570 2665 }
2571 2666
2572 2667 if (cpp) {
2573 2668 Sym *rsym;
2574 2669
2575 2670 DBG_CALL(Dbg_syms_cap_convert(ofl, ndx, name, nsym));
2576 2671
2577 2672 /*
2578 2673 * Allocate a new symbol descriptor to represent the
2579 2674 * transformed global symbol. The descriptor points
2580 2675 * to the original symbol information (which might
2581 2676 * indicate a global or weak visibility). The symbol
2582 2677 * information will be transformed into a local symbol
2583 2678 * later, after any weak aliases are culled.
2584 2679 */
2585 2680 if ((cpp->c_osdp =
2586 2681 libld_malloc(sizeof (Sym_desc))) == NULL)
2587 2682 return (S_ERROR);
2588 2683
2589 2684 cpp->c_osdp->sd_name = name;
2590 2685 cpp->c_osdp->sd_sym = nsym;
2591 2686 cpp->c_osdp->sd_shndx = shndx;
2592 2687 cpp->c_osdp->sd_file = ifl;
2593 2688 cpp->c_osdp->sd_isc = ifl->ifl_isdesc[shndx];
2594 2689 cpp->c_osdp->sd_ref = REF_REL_NEED;
2595 2690
2596 2691 /*
2597 2692 * Save the capabilities group this symbol belongs to,
2598 2693 * and the original symbol index.
2599 2694 */
2600 2695 cpp->c_group = cdp->ca_groups->apl_data[0];
2601 2696 cpp->c_ndx = ndx;
2602 2697
2603 2698 /*
2604 2699 * Replace the original symbol definition with a symbol
2605 2700 * reference. Make sure this reference isn't left as a
2606 2701 * weak.
2607 2702 */
2608 2703 if ((rsym = libld_malloc(sizeof (Sym))) == NULL)
2609 2704 return (S_ERROR);
2610 2705
2611 2706 *rsym = *nsym;
2612 2707
2613 2708 rsym->st_info = ELF_ST_INFO(STB_GLOBAL, ntype);
2614 2709 rsym->st_shndx = shndx = SHN_UNDEF;
2615 2710 rsym->st_value = 0;
2616 2711 rsym->st_size = 0;
2617 2712
2618 2713 sdflags |= FLG_SY_CAP;
2619 2714
2620 2715 nsym = rsym;
2621 2716 }
2622 2717
2623 2718 /*
2624 2719 * If the symbol does not already exist in the internal symbol
2625 2720 * table add it, otherwise resolve the conflict. If the symbol
2626 2721 * from this file is kept, retain its symbol table index for
2627 2722 * possible use in associating a global alias.
2628 2723 */
2629 2724 if ((sdp = ld_sym_find(name, hash, &where, ofl)) == NULL) {
2630 2725 DBG_CALL(Dbg_syms_global(ofl->ofl_lml, ndx, name));
2631 2726 if ((sdp = ld_sym_enter(name, nsym, hash, ifl, ofl, ndx,
2632 2727 shndx, sdflags, &where)) == (Sym_desc *)S_ERROR)
2633 2728 return (S_ERROR);
2634 2729
2635 2730 } else if (ld_sym_resolve(sdp, nsym, ifl, ofl, ndx, shndx,
2636 2731 sdflags) == S_ERROR)
2637 2732 return (S_ERROR);
2638 2733
2639 2734 /*
2640 2735 * Now that we have a symbol descriptor, retain the descriptor
2641 2736 * for later use by symbol capabilities processing.
2642 2737 */
2643 2738 if (cpp)
2644 2739 cpp->c_nsdp = sdp;
2645 2740
2646 2741 /*
2647 2742 * After we've compared a defined symbol in one shared
2648 2743 * object, flag the symbol so we don't compare it again.
2649 2744 */
2650 2745 if ((etype == ET_DYN) && (nsym->st_shndx != SHN_UNDEF) &&
2651 2746 ((sdp->sd_flags & FLG_SY_SOFOUND) == 0))
2652 2747 sdp->sd_flags |= FLG_SY_SOFOUND;
2653 2748
2654 2749 /*
2655 2750 * If the symbol is accepted from this file retain the symbol
2656 2751 * index for possible use in aliasing.
2657 2752 */
2658 2753 if (sdp->sd_file == ifl)
2659 2754 sdp->sd_symndx = ndx;
2660 2755
2661 2756 ifl->ifl_oldndx[ndx] = sdp;
2662 2757
2663 2758 /*
2664 2759 * If we've accepted a register symbol, continue to validate
2665 2760 * it.
2666 2761 */
2667 2762 if (sdp->sd_flags & FLG_SY_REGSYM) {
2668 2763 Sym_desc *rsdp;
2669 2764
2670 2765 /*
2671 2766 * The presence of FLG_SY_REGSYM means that
2672 2767 * the pointers in ld_targ.t_ms are non-NULL.
2673 2768 */
2674 2769 rsdp = (*ld_targ.t_ms.ms_reg_find)(sdp->sd_sym, ofl);
2675 2770 if (rsdp == NULL) {
2676 2771 if ((*ld_targ.t_ms.ms_reg_enter)(sdp, ofl) == 0)
2677 2772 return (S_ERROR);
2678 2773 } else if (rsdp != sdp) {
2679 2774 (void) (*ld_targ.t_ms.ms_reg_check)(rsdp,
2680 2775 sdp->sd_sym, sdp->sd_name, ifl, ofl);
2681 2776 }
2682 2777 }
2683 2778
2684 2779 /*
2685 2780 * For a relocatable object, if this symbol is defined
2686 2781 * and has non-zero length and references an address
2687 2782 * within an associated section, then check its extents
2688 2783 * to make sure the section boundaries encompass it.
2689 2784 * If they don't, the ELF file is corrupt. Note that this
2690 2785 * global symbol may have come from another file to satisfy
2691 2786 * an UNDEF symbol of the same name from this one. In that
2692 2787 * case, we don't check it, because it was already checked
2693 2788 * as part of its own file.
2694 2789 */
2695 2790 if (etype_rel && (sdp->sd_file == ifl)) {
2696 2791 Sym *tsym = sdp->sd_sym;
2697 2792
2698 2793 if (SYM_LOC_BADADDR(sdp, tsym,
2699 2794 ELF_ST_TYPE(tsym->st_info))) {
2700 2795 issue_badaddr_msg(ifl, ofl, sdp,
2701 2796 tsym, tsym->st_shndx);
2702 2797 continue;
2703 2798 }
2704 2799 }
2705 2800 }
2706 2801 DBG_CALL(Dbg_util_nl(ofl->ofl_lml, DBG_NL_STD));
2707 2802
2708 2803 /*
2709 2804 * Associate weak (alias) symbols to their non-weak counterparts by
2710 2805 * scanning the global symbols one more time.
2711 2806 *
2712 2807 * This association is needed when processing the symbols from a shared
2713 2808 * object dependency when a a weak definition satisfies a reference:
2714 2809 *
2715 2810 * - When building a dynamic executable, if a referenced symbol is a
2716 2811 * data item, the symbol data is copied to the executables address
2717 2812 * space. In this copy-relocation case, we must also reassociate
2718 2813 * the alias symbol with its new location in the executable.
2719 2814 *
2720 2815 * - If the referenced symbol is a function then we may need to
2721 2816 * promote the symbols binding from undefined weak to undefined,
2722 2817 * otherwise the run-time linker will not generate the correct
2723 2818 * relocation error should the symbol not be found.
2724 2819 *
2725 2820 * Weak alias association is also required when a local dynsym table
2726 2821 * is being created. This table should only contain one instance of a
2727 2822 * symbol that is associated to a given address.
2728 2823 *
2729 2824 * The true association between a weak/strong symbol pair is that both
2730 2825 * symbol entries are identical, thus first we create a sorted symbol
2731 2826 * list keyed off of the symbols section index and value. If the symbol
2732 2827 * belongs to the same section and has the same value, then the chances
2733 2828 * are that the rest of the symbols data is the same. This list is then
2734 2829 * scanned for weak symbols, and if one is found then any strong
2735 2830 * association will exist in the entries that follow. Thus we just have
2736 2831 * to scan one (typically a single alias) or more (in the uncommon
2737 2832 * instance of multiple weak to strong associations) entries to
2738 2833 * determine if a match exists.
2739 2834 */
2740 2835 if (weak && (OFL_ALLOW_LDYNSYM(ofl) || (etype == ET_DYN)) &&
2741 2836 (total > local)) {
2742 2837 static Sym_desc **sort;
2743 2838 static size_t osize = 0;
2744 2839 size_t nsize = (total - local) * sizeof (Sym_desc *);
2745 2840
2746 2841 /*
2747 2842 * As we might be processing many input files, and many symbols,
2748 2843 * try and reuse a static sort buffer. Note, presently we're
2749 2844 * playing the game of never freeing any buffers as there's a
2750 2845 * belief this wastes time.
2751 2846 */
2752 2847 if ((osize == 0) || (nsize > osize)) {
2753 2848 if ((sort = libld_malloc(nsize)) == NULL)
2754 2849 return (S_ERROR);
2755 2850 osize = nsize;
2756 2851 }
2757 2852 (void) memcpy((void *)sort, &ifl->ifl_oldndx[local], nsize);
2758 2853
2759 2854 qsort(sort, (total - local), sizeof (Sym_desc *), compare);
2760 2855
2761 2856 for (ndx = 0; ndx < (total - local); ndx++) {
2762 2857 Sym_desc *wsdp = sort[ndx];
2763 2858 Sym *wsym;
2764 2859 int sndx;
2765 2860
2766 2861 /*
2767 2862 * Ignore any empty symbol descriptor, or the case where
2768 2863 * the symbol has been resolved to a different file.
2769 2864 */
2770 2865 if ((wsdp == NULL) || (wsdp->sd_file != ifl))
2771 2866 continue;
2772 2867
2773 2868 wsym = wsdp->sd_sym;
2774 2869
2775 2870 if ((wsym->st_shndx == SHN_UNDEF) ||
2776 2871 (wsdp->sd_flags & FLG_SY_SPECSEC) ||
2777 2872 (ELF_ST_BIND(wsym->st_info) != STB_WEAK))
2778 2873 continue;
2779 2874
2780 2875 /*
2781 2876 * We have a weak symbol, if it has a strong alias it
2782 2877 * will have been sorted to one of the following sort
2783 2878 * table entries. Note that we could have multiple weak
2784 2879 * symbols aliased to one strong (if this occurs then
2785 2880 * the strong symbol only maintains one alias back to
2786 2881 * the last weak).
2787 2882 */
2788 2883 for (sndx = ndx + 1; sndx < (total - local); sndx++) {
2789 2884 Sym_desc *ssdp = sort[sndx];
2790 2885 Sym *ssym;
2791 2886 sd_flag_t w_dynbits, s_dynbits;
2792 2887
2793 2888 /*
2794 2889 * Ignore any empty symbol descriptor, or the
2795 2890 * case where the symbol has been resolved to a
2796 2891 * different file.
2797 2892 */
2798 2893 if ((ssdp == NULL) || (ssdp->sd_file != ifl))
2799 2894 continue;
2800 2895
2801 2896 ssym = ssdp->sd_sym;
2802 2897
2803 2898 if (ssym->st_shndx == SHN_UNDEF)
2804 2899 continue;
2805 2900
2806 2901 if ((ssym->st_shndx != wsym->st_shndx) ||
2807 2902 (ssym->st_value != wsym->st_value))
2808 2903 break;
2809 2904
2810 2905 if ((ssym->st_size != wsym->st_size) ||
2811 2906 (ssdp->sd_flags & FLG_SY_SPECSEC) ||
2812 2907 (ELF_ST_BIND(ssym->st_info) == STB_WEAK))
2813 2908 continue;
2814 2909
2815 2910 /*
2816 2911 * If a sharable object, set link fields so
2817 2912 * that they reference each other.`
2818 2913 */
2819 2914 if (etype == ET_DYN) {
2820 2915 ssdp->sd_aux->sa_linkndx =
2821 2916 (Word)wsdp->sd_symndx;
2822 2917 wsdp->sd_aux->sa_linkndx =
2823 2918 (Word)ssdp->sd_symndx;
2824 2919 }
2825 2920
2826 2921 /*
2827 2922 * Determine which of these two symbols go into
2828 2923 * the sort section. If a mapfile has made
2829 2924 * explicit settings of the FLG_SY_*DYNSORT
2830 2925 * flags for both symbols, then we do what they
2831 2926 * say. If one has the DYNSORT flags set, we
2832 2927 * set the NODYNSORT bit in the other. And if
2833 2928 * neither has an explicit setting, then we
2834 2929 * favor the weak symbol because they usually
2835 2930 * lack the leading underscore.
2836 2931 */
2837 2932 w_dynbits = wsdp->sd_flags &
2838 2933 (FLG_SY_DYNSORT | FLG_SY_NODYNSORT);
2839 2934 s_dynbits = ssdp->sd_flags &
2840 2935 (FLG_SY_DYNSORT | FLG_SY_NODYNSORT);
2841 2936 if (!(w_dynbits && s_dynbits)) {
2842 2937 if (s_dynbits) {
2843 2938 if (s_dynbits == FLG_SY_DYNSORT)
2844 2939 wsdp->sd_flags |=
2845 2940 FLG_SY_NODYNSORT;
2846 2941 } else if (w_dynbits !=
2847 2942 FLG_SY_NODYNSORT) {
2848 2943 ssdp->sd_flags |=
2849 2944 FLG_SY_NODYNSORT;
2850 2945 }
2851 2946 }
2852 2947 break;
2853 2948 }
2854 2949 }
2855 2950 }
2856 2951
2857 2952 /*
2858 2953 * Having processed all symbols, under -z symbolcap, reprocess any
2859 2954 * symbols that are being translated from global to locals. The symbol
2860 2955 * pair that has been collected defines the original symbol (c_osdp),
2861 2956 * which will become a local, and the new symbol (c_nsdp), which will
2862 2957 * become a reference (UNDEF) for the original.
2863 2958 *
2864 2959 * Scan these symbol pairs looking for weak symbols, which have non-weak
2865 2960 * aliases. There is no need to translate both of these symbols to
2866 2961 * locals, only the global is necessary.
2867 2962 */
2868 2963 if (cappairs) {
2869 2964 Aliste idx1;
2870 2965 Cap_pair *cpp1;
2871 2966
2872 2967 for (ALIST_TRAVERSE(cappairs, idx1, cpp1)) {
2873 2968 Sym_desc *sdp1 = cpp1->c_osdp;
2874 2969 Sym *sym1 = sdp1->sd_sym;
2875 2970 uchar_t bind1 = ELF_ST_BIND(sym1->st_info);
2876 2971 Aliste idx2;
2877 2972 Cap_pair *cpp2;
2878 2973
2879 2974 /*
2880 2975 * If this symbol isn't weak, it's capability member is
2881 2976 * retained for the creation of a local symbol.
2882 2977 */
2883 2978 if (bind1 != STB_WEAK)
2884 2979 continue;
2885 2980
2886 2981 /*
2887 2982 * If this is a weak symbol, traverse the capabilities
2888 2983 * list again to determine if a corresponding non-weak
2889 2984 * symbol exists.
2890 2985 */
2891 2986 for (ALIST_TRAVERSE(cappairs, idx2, cpp2)) {
2892 2987 Sym_desc *sdp2 = cpp2->c_osdp;
2893 2988 Sym *sym2 = sdp2->sd_sym;
2894 2989 uchar_t bind2 =
2895 2990 ELF_ST_BIND(sym2->st_info);
2896 2991
2897 2992 if ((cpp1 == cpp2) ||
2898 2993 (cpp1->c_group != cpp2->c_group) ||
2899 2994 (sym1->st_value != sym2->st_value) ||
2900 2995 (bind2 == STB_WEAK))
2901 2996 continue;
2902 2997
2903 2998 /*
2904 2999 * The weak symbol (sym1) has a non-weak (sym2)
2905 3000 * counterpart. There's no point in translating
2906 3001 * both of these equivalent symbols to locals.
2907 3002 * Add this symbol capability alias to the
2908 3003 * capabilities family information, and remove
2909 3004 * the weak symbol.
2910 3005 */
2911 3006 if (ld_cap_add_family(ofl, cpp2->c_nsdp,
2912 3007 cpp1->c_nsdp, NULL, NULL) == S_ERROR)
2913 3008 return (S_ERROR);
2914 3009
2915 3010 free((void *)cpp1->c_osdp);
2916 3011 (void) alist_delete(cappairs, &idx1);
2917 3012 }
2918 3013 }
2919 3014
2920 3015 DBG_CALL(Dbg_util_nl(ofl->ofl_lml, DBG_NL_STD));
2921 3016
2922 3017 /*
2923 3018 * The capability pairs information now represents all the
2924 3019 * global symbols that need transforming to locals. These
2925 3020 * local symbols are renamed using their group identifiers.
2926 3021 */
2927 3022 for (ALIST_TRAVERSE(cappairs, idx1, cpp1)) {
2928 3023 Sym_desc *osdp = cpp1->c_osdp;
2929 3024 Objcapset *capset;
2930 3025 size_t nsize, tsize;
2931 3026 const char *oname;
2932 3027 char *cname, *idstr;
2933 3028 Sym *csym;
2934 3029
2935 3030 /*
2936 3031 * If the local symbol has not yet been translated
2937 3032 * convert it to a local symbol with a name.
2938 3033 */
2939 3034 if ((osdp->sd_flags & FLG_SY_CAP) != 0)
2940 3035 continue;
2941 3036
2942 3037 /*
2943 3038 * As we're converting object capabilities to symbol
2944 3039 * capabilities, obtain the capabilities set for this
2945 3040 * object, so as to retrieve the CA_SUNW_ID value.
2946 3041 */
2947 3042 capset = &cpp1->c_group->cg_set;
2948 3043
2949 3044 /*
2950 3045 * Create a new name from the existing symbol and the
2951 3046 * capabilities group identifier. Note, the delimiter
2952 3047 * between the symbol name and identifier name is hard-
2953 3048 * coded here (%), so that we establish a convention
2954 3049 * for transformed symbol names.
2955 3050 */
2956 3051 oname = osdp->sd_name;
2957 3052
2958 3053 idstr = capset->oc_id.cs_str;
2959 3054 nsize = strlen(oname);
2960 3055 tsize = nsize + 1 + strlen(idstr) + 1;
2961 3056 if ((cname = libld_malloc(tsize)) == 0)
2962 3057 return (S_ERROR);
2963 3058
2964 3059 (void) strcpy(cname, oname);
2965 3060 cname[nsize++] = '%';
2966 3061 (void) strcpy(&cname[nsize], idstr);
2967 3062
2968 3063 /*
2969 3064 * Allocate a new symbol table entry, transform this
2970 3065 * symbol to a local, and assign the new name.
2971 3066 */
2972 3067 if ((csym = libld_malloc(sizeof (Sym))) == NULL)
2973 3068 return (S_ERROR);
2974 3069
2975 3070 *csym = *osdp->sd_sym;
2976 3071 csym->st_info = ELF_ST_INFO(STB_LOCAL,
2977 3072 ELF_ST_TYPE(osdp->sd_sym->st_info));
2978 3073
2979 3074 osdp->sd_name = cname;
2980 3075 osdp->sd_sym = csym;
2981 3076 osdp->sd_flags = FLG_SY_CAP;
2982 3077
2983 3078 /*
2984 3079 * Keep track of this new local symbol. As -z symbolcap
2985 3080 * can only be used to create a relocatable object, a
2986 3081 * dynamic symbol table can't exist. Ensure there is
2987 3082 * space reserved in the string table.
2988 3083 */
2989 3084 ofl->ofl_caploclcnt++;
2990 3085 if (st_insert(ofl->ofl_strtab, cname) == -1)
2991 3086 return (S_ERROR);
2992 3087
2993 3088 DBG_CALL(Dbg_syms_cap_local(ofl, cpp1->c_ndx,
2994 3089 cname, csym, osdp));
2995 3090
2996 3091 /*
2997 3092 * Establish this capability pair as a family.
2998 3093 */
2999 3094 if (ld_cap_add_family(ofl, cpp1->c_nsdp, osdp,
3000 3095 cpp1->c_group, &ifl->ifl_caps->ca_syms) == S_ERROR)
3001 3096 return (S_ERROR);
3002 3097 }
3003 3098 }
3004 3099
3005 3100 return (1);
3006 3101
3007 3102 #undef SYM_LOC_BADADDR
3008 3103 }
3009 3104
3010 3105 /*
3011 3106 * Add an undefined symbol to the symbol table. The reference originates from
3012 3107 * the location identified by the message id (mid). These references can
3013 3108 * originate from command line options such as -e, -u, -initarray, etc.
3014 3109 * (identified with MSG_INTL(MSG_STR_COMMAND)), or from internally generated
3015 3110 * TLS relocation references (identified with MSG_INTL(MSG_STR_TLSREL)).
3016 3111 */
3017 3112 Sym_desc *
3018 3113 ld_sym_add_u(const char *name, Ofl_desc *ofl, Msg mid)
3019 3114 {
3020 3115 Sym *sym;
3021 3116 Ifl_desc *ifl = NULL, *_ifl;
3022 3117 Sym_desc *sdp;
3023 3118 Word hash;
3024 3119 Aliste idx;
3025 3120 avl_index_t where;
3026 3121 const char *reference = MSG_INTL(mid);
3027 3122
3028 3123 /*
3029 3124 * As an optimization, determine whether we've already generated this
3030 3125 * reference. If the symbol doesn't already exist we'll create it.
3031 3126 * Or if the symbol does exist from a different source, we'll resolve
3032 3127 * the conflict.
3033 3128 */
3034 3129 /* LINTED */
3035 3130 hash = (Word)elf_hash(name);
3036 3131 if ((sdp = ld_sym_find(name, hash, &where, ofl)) != NULL) {
3037 3132 if ((sdp->sd_sym->st_shndx == SHN_UNDEF) &&
3038 3133 (sdp->sd_file->ifl_name == reference))
3039 3134 return (sdp);
3040 3135 }
3041 3136
3042 3137 /*
3043 3138 * Determine whether a pseudo input file descriptor exists to represent
3044 3139 * the command line, as any global symbol needs an input file descriptor
3045 3140 * during any symbol resolution (refer to map_ifl() which provides a
3046 3141 * similar method for adding symbols from mapfiles).
3047 3142 */
3048 3143 for (APLIST_TRAVERSE(ofl->ofl_objs, idx, _ifl))
3049 3144 if (strcmp(_ifl->ifl_name, reference) == 0) {
3050 3145 ifl = _ifl;
3051 3146 break;
3052 3147 }
3053 3148
3054 3149 /*
3055 3150 * If no descriptor exists create one.
3056 3151 */
3057 3152 if (ifl == NULL) {
3058 3153 if ((ifl = libld_calloc(sizeof (Ifl_desc), 1)) == NULL)
3059 3154 return ((Sym_desc *)S_ERROR);
3060 3155 ifl->ifl_name = reference;
3061 3156 ifl->ifl_flags = FLG_IF_NEEDED | FLG_IF_FILEREF;
3062 3157 if ((ifl->ifl_ehdr = libld_calloc(sizeof (Ehdr), 1)) == NULL)
3063 3158 return ((Sym_desc *)S_ERROR);
3064 3159 ifl->ifl_ehdr->e_type = ET_REL;
3065 3160
3066 3161 if (aplist_append(&ofl->ofl_objs, ifl, AL_CNT_OFL_OBJS) == NULL)
3067 3162 return ((Sym_desc *)S_ERROR);
3068 3163 }
3069 3164
3070 3165 /*
3071 3166 * Allocate a symbol structure and add it to the global symbol table.
3072 3167 */
3073 3168 if ((sym = libld_calloc(sizeof (Sym), 1)) == NULL)
3074 3169 return ((Sym_desc *)S_ERROR);
3075 3170 sym->st_info = ELF_ST_INFO(STB_GLOBAL, STT_NOTYPE);
3076 3171 sym->st_shndx = SHN_UNDEF;
3077 3172
3078 3173 DBG_CALL(Dbg_syms_process(ofl->ofl_lml, ifl));
3079 3174 if (sdp == NULL) {
3080 3175 DBG_CALL(Dbg_syms_global(ofl->ofl_lml, 0, name));
3081 3176 if ((sdp = ld_sym_enter(name, sym, hash, ifl, ofl, 0, SHN_UNDEF,
3082 3177 0, &where)) == (Sym_desc *)S_ERROR)
3083 3178 return ((Sym_desc *)S_ERROR);
3084 3179 } else if (ld_sym_resolve(sdp, sym, ifl, ofl, 0,
3085 3180 SHN_UNDEF, 0) == S_ERROR)
3086 3181 return ((Sym_desc *)S_ERROR);
3087 3182
3088 3183 sdp->sd_flags &= ~FLG_SY_CLEAN;
3089 3184 sdp->sd_flags |= FLG_SY_CMDREF;
3090 3185
3091 3186 return (sdp);
3092 3187 }
3093 3188
3094 3189 /*
3095 3190 * STT_SECTION symbols have their st_name field set to NULL, and consequently
3096 3191 * have no name. Generate a name suitable for diagnostic use for such a symbol
3097 3192 * and store it in the input section descriptor. The resulting name will be
3098 3193 * of the form:
3099 3194 *
3100 3195 * "XXX (section)"
3101 3196 *
3102 3197 * where XXX is the name of the section.
3103 3198 *
3104 3199 * entry:
3105 3200 * isc - Input section associated with the symbol.
3106 3201 * fmt - NULL, or format string to use.
3107 3202 *
3108 3203 * exit:
3109 3204 * Sets isp->is_sym_name to the allocated string. Returns the
3110 3205 * string pointer, or NULL on allocation failure.
3111 3206 */
3112 3207 const char *
3113 3208 ld_stt_section_sym_name(Is_desc *isp)
3114 3209 {
3115 3210 const char *fmt;
3116 3211 char *str;
3117 3212 size_t len;
3118 3213
3119 3214 if ((isp == NULL) || (isp->is_name == NULL))
3120 3215 return (NULL);
3121 3216
3122 3217 if (isp->is_sym_name == NULL) {
3123 3218 fmt = (isp->is_flags & FLG_IS_GNSTRMRG) ?
3124 3219 MSG_INTL(MSG_STR_SECTION_MSTR) : MSG_INTL(MSG_STR_SECTION);
3125 3220
3126 3221 len = strlen(fmt) + strlen(isp->is_name) + 1;
3127 3222
3128 3223 if ((str = libld_malloc(len)) == NULL)
3129 3224 return (NULL);
3130 3225 (void) snprintf(str, len, fmt, isp->is_name);
3131 3226 isp->is_sym_name = str;
3132 3227 }
3133 3228
3134 3229 return (isp->is_sym_name);
3135 3230 }
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