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ld: implement -ztype and rework option parsing
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--- old/usr/src/cmd/sgs/libld/common/sections.c
+++ new/usr/src/cmd/sgs/libld/common/sections.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 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
27 27 */
28 28
29 29 /*
30 30 * Module sections. Initialize special sections
31 31 */
32 32
33 33 #define ELF_TARGET_AMD64
34 34
35 35 #include <string.h>
36 36 #include <strings.h>
37 37 #include <stdio.h>
38 38 #include <link.h>
39 39 #include <debug.h>
40 40 #include "msg.h"
41 41 #include "_libld.h"
42 42
43 43 inline static void
44 44 remove_local(Ofl_desc *ofl, Sym_desc *sdp, int allow_ldynsym)
45 45 {
46 46 Sym *sym = sdp->sd_sym;
47 47 uchar_t type = ELF_ST_TYPE(sym->st_info);
48 48 /* LINTED - only used for assert() */
49 49 int err;
50 50
51 51 if ((ofl->ofl_flags & FLG_OF_REDLSYM) == 0) {
52 52 ofl->ofl_locscnt--;
53 53
54 54 err = st_delstring(ofl->ofl_strtab, sdp->sd_name);
55 55 assert(err != -1);
56 56
57 57 if (allow_ldynsym && ldynsym_symtype[type]) {
58 58 ofl->ofl_dynlocscnt--;
59 59
60 60 err = st_delstring(ofl->ofl_dynstrtab, sdp->sd_name);
61 61 assert(err != -1);
62 62 /* Remove from sort section? */
63 63 DYNSORT_COUNT(sdp, sym, type, --);
64 64 }
65 65 }
66 66 sdp->sd_flags |= FLG_SY_ISDISC;
67 67 }
68 68
69 69 inline static void
70 70 remove_scoped(Ofl_desc *ofl, Sym_desc *sdp, int allow_ldynsym)
71 71 {
72 72 Sym *sym = sdp->sd_sym;
73 73 uchar_t type = ELF_ST_TYPE(sym->st_info);
74 74 /* LINTED - only used for assert() */
75 75 int err;
76 76
77 77 ofl->ofl_scopecnt--;
78 78 ofl->ofl_elimcnt++;
79 79
80 80 err = st_delstring(ofl->ofl_strtab, sdp->sd_name);
81 81 assert(err != -1);
82 82
83 83 if (allow_ldynsym && ldynsym_symtype[type]) {
84 84 ofl->ofl_dynscopecnt--;
85 85
86 86 err = st_delstring(ofl->ofl_dynstrtab, sdp->sd_name);
87 87 assert(err != -1);
88 88 /* Remove from sort section? */
89 89 DYNSORT_COUNT(sdp, sym, type, --);
90 90 }
91 91 sdp->sd_flags |= FLG_SY_ELIM;
92 92 }
93 93
94 94 inline static void
95 95 ignore_sym(Ofl_desc *ofl, Ifl_desc *ifl, Sym_desc *sdp, int allow_ldynsym)
96 96 {
97 97 Os_desc *osp;
98 98 Is_desc *isp = sdp->sd_isc;
99 99 uchar_t bind = ELF_ST_BIND(sdp->sd_sym->st_info);
100 100
101 101 if (bind == STB_LOCAL) {
102 102 uchar_t type = ELF_ST_TYPE(sdp->sd_sym->st_info);
103 103
104 104 /*
105 105 * Skip section symbols, these were never collected in the
106 106 * first place.
107 107 */
108 108 if (type == STT_SECTION)
109 109 return;
110 110
111 111 /*
112 112 * Determine if the whole file is being removed. Remove any
113 113 * file symbol, and any symbol that is not associated with a
114 114 * section, provided the symbol has not been identified as
115 115 * (update) required.
116 116 */
117 117 if (((ifl->ifl_flags & FLG_IF_FILEREF) == 0) &&
118 118 ((type == STT_FILE) || ((isp == NULL) &&
119 119 ((sdp->sd_flags & FLG_SY_UPREQD) == 0)))) {
120 120 DBG_CALL(Dbg_syms_discarded(ofl->ofl_lml, sdp));
121 121 if (ifl->ifl_flags & FLG_IF_IGNORE)
122 122 remove_local(ofl, sdp, allow_ldynsym);
123 123 return;
124 124 }
125 125
126 126 } else {
127 127 /*
128 128 * Global symbols can only be eliminated when the interfaces of
129 129 * an object have been defined via versioning/scoping.
130 130 */
131 131 if (!SYM_IS_HIDDEN(sdp))
132 132 return;
133 133
134 134 /*
135 135 * Remove any unreferenced symbols that are not associated with
136 136 * a section.
137 137 */
138 138 if ((isp == NULL) && ((sdp->sd_flags & FLG_SY_UPREQD) == 0)) {
139 139 DBG_CALL(Dbg_syms_discarded(ofl->ofl_lml, sdp));
140 140 if (ifl->ifl_flags & FLG_IF_IGNORE)
141 141 remove_scoped(ofl, sdp, allow_ldynsym);
142 142 return;
143 143 }
144 144 }
145 145
146 146 /*
147 147 * Do not discard any symbols that are associated with non-allocable
148 148 * segments.
149 149 */
150 150 if (isp && ((isp->is_flags & FLG_IS_SECTREF) == 0) &&
151 151 ((osp = isp->is_osdesc) != 0) &&
152 152 (osp->os_sgdesc->sg_phdr.p_type == PT_LOAD)) {
153 153 DBG_CALL(Dbg_syms_discarded(ofl->ofl_lml, sdp));
154 154 if (ifl->ifl_flags & FLG_IF_IGNORE) {
155 155 if (bind == STB_LOCAL)
156 156 remove_local(ofl, sdp, allow_ldynsym);
157 157 else
158 158 remove_scoped(ofl, sdp, allow_ldynsym);
159 159 }
160 160 }
161 161 }
162 162
163 163 static Boolean
164 164 isdesc_discarded(Is_desc *isp)
165 165 {
166 166 Ifl_desc *ifl = isp->is_file;
167 167 Os_desc *osp = isp->is_osdesc;
168 168 Word ptype = osp->os_sgdesc->sg_phdr.p_type;
169 169
170 170 if (isp->is_flags & FLG_IS_DISCARD)
171 171 return (TRUE);
172 172
173 173 /*
174 174 * If the file is discarded, it will take
175 175 * the section with it.
176 176 */
177 177 if (ifl &&
178 178 (((ifl->ifl_flags & FLG_IF_FILEREF) == 0) ||
179 179 ((ptype == PT_LOAD) &&
180 180 ((isp->is_flags & FLG_IS_SECTREF) == 0) &&
181 181 (isp->is_shdr->sh_size > 0))) &&
182 182 (ifl->ifl_flags & FLG_IF_IGNORE))
183 183 return (TRUE);
184 184
185 185 return (FALSE);
186 186 }
187 187
188 188 /*
189 189 * There are situations where we may count output sections (ofl_shdrcnt)
190 190 * that are subsequently eliminated from the output object. Whether or
191 191 * not this happens cannot be known until all input has been seen and
192 192 * section elimination code has run. However, the situations where this
193 193 * outcome is possible are known, and are flagged by setting FLG_OF_ADJOSCNT.
194 194 *
195 195 * If FLG_OF_ADJOSCNT is set, this routine makes a pass over the output
196 196 * sections. If an unused output section is encountered, we decrement
197 197 * ofl->ofl_shdrcnt and remove the section name from the .shstrtab string
198 198 * table (ofl->ofl_shdrsttab).
199 199 *
200 200 * This code must be kept in sync with the similar code
201 201 * found in outfile.c:ld_create_outfile().
202 202 */
203 203 static void
204 204 adjust_os_count(Ofl_desc *ofl)
205 205 {
206 206 Sg_desc *sgp;
207 207 Is_desc *isp;
208 208 Os_desc *osp;
209 209 Aliste idx1;
210 210
211 211 if ((ofl->ofl_flags & FLG_OF_ADJOSCNT) == 0)
212 212 return;
213 213
214 214 /*
215 215 * For each output section, look at the input sections to find at least
216 216 * one input section that has not been eliminated. If none are found,
217 217 * the -z ignore processing above has eliminated that output section.
218 218 */
219 219 for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
220 220 Aliste idx2;
221 221
222 222 for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp)) {
223 223 Aliste idx3;
224 224 int keep = 0, os_isdescs_idx;
225 225
226 226 OS_ISDESCS_TRAVERSE(os_isdescs_idx, osp, idx3, isp) {
227 227 /*
228 228 * We have found a kept input section,
229 229 * so the output section will be created.
230 230 */
231 231 if (!isdesc_discarded(isp)) {
232 232 keep = 1;
233 233 break;
234 234 }
235 235 }
236 236 /*
237 237 * If no section of this name was kept, decrement
238 238 * the count and remove the name from .shstrtab.
239 239 */
240 240 if (keep == 0) {
241 241 /* LINTED - only used for assert() */
242 242 int err;
243 243
244 244 ofl->ofl_shdrcnt--;
245 245 err = st_delstring(ofl->ofl_shdrsttab,
246 246 osp->os_name);
247 247 assert(err != -1);
248 248 }
249 249 }
250 250 }
251 251 }
252 252
253 253 /*
254 254 * If -zignore has been in effect, scan all input files to determine if the
255 255 * file, or sections from the file, have been referenced. If not, the file or
256 256 * some of the files sections can be discarded. If sections are to be
257 257 * discarded, rescan the output relocations and the symbol table and remove
258 258 * the relocations and symbol entries that are no longer required.
259 259 *
260 260 * Note: It's possible that a section which is being discarded has contributed
261 261 * to the GOT table or the PLT table. However, we can't at this point
262 262 * eliminate the corresponding entries. This is because there could well
263 263 * be other sections referencing those same entries, but we don't have
264 264 * the infrastructure to determine this. So, keep the PLT and GOT
265 265 * entries in the table in case someone wants them.
266 266 * Note: The section to be affected needs to be allocatable.
267 267 * So even if -zignore is in effect, if the section is not allocatable,
268 268 * we do not eliminate it.
269 269 */
270 270 static uintptr_t
271 271 ignore_section_processing(Ofl_desc *ofl)
272 272 {
273 273 Sg_desc *sgp;
274 274 Is_desc *isp;
275 275 Os_desc *osp;
276 276 Ifl_desc *ifl;
277 277 Rel_cachebuf *rcbp;
278 278 Rel_desc *rsp;
279 279 int allow_ldynsym = OFL_ALLOW_LDYNSYM(ofl);
280 280 Aliste idx1;
281 281
282 282 for (APLIST_TRAVERSE(ofl->ofl_objs, idx1, ifl)) {
283 283 uint_t num, discard;
284 284
285 285 /*
286 286 * Diagnose (-D unused) a completely unreferenced file.
287 287 */
288 288 if ((ifl->ifl_flags & FLG_IF_FILEREF) == 0)
289 289 DBG_CALL(Dbg_unused_file(ofl->ofl_lml,
290 290 ifl->ifl_name, 0, 0));
291 291 if (((ofl->ofl_flags1 & FLG_OF1_IGNPRC) == 0) ||
292 292 ((ifl->ifl_flags & FLG_IF_IGNORE) == 0))
293 293 continue;
294 294
295 295 /*
296 296 * Before scanning the whole symbol table to determine if
297 297 * symbols should be discard - quickly (relatively) scan the
298 298 * sections to determine if any are to be discarded.
299 299 */
300 300 discard = 0;
301 301 if (ifl->ifl_flags & FLG_IF_FILEREF) {
302 302 for (num = 1; num < ifl->ifl_shnum; num++) {
303 303 if (((isp = ifl->ifl_isdesc[num]) != NULL) &&
304 304 ((isp->is_flags & FLG_IS_SECTREF) == 0) &&
305 305 ((osp = isp->is_osdesc) != NULL) &&
306 306 ((sgp = osp->os_sgdesc) != NULL) &&
307 307 (sgp->sg_phdr.p_type == PT_LOAD)) {
308 308 discard++;
309 309 break;
310 310 }
311 311 }
312 312 }
313 313
314 314 /*
315 315 * No sections are to be 'ignored'
316 316 */
317 317 if ((discard == 0) && (ifl->ifl_flags & FLG_IF_FILEREF))
318 318 continue;
319 319
320 320 /*
321 321 * We know that we have discarded sections. Scan the symbol
322 322 * table for this file to determine if symbols need to be
323 323 * discarded that are associated with the 'ignored' sections.
324 324 */
325 325 for (num = 1; num < ifl->ifl_symscnt; num++) {
326 326 Sym_desc *sdp;
327 327
328 328 /*
329 329 * If the symbol definition has been resolved to another
330 330 * file, or the symbol has already been discarded or
331 331 * eliminated, skip it.
332 332 */
333 333 sdp = ifl->ifl_oldndx[num];
334 334 if ((sdp->sd_file != ifl) ||
335 335 (sdp->sd_flags &
336 336 (FLG_SY_ISDISC | FLG_SY_INVALID | FLG_SY_ELIM)))
337 337 continue;
338 338
339 339 /*
340 340 * Complete the investigation of the symbol.
341 341 */
342 342 ignore_sym(ofl, ifl, sdp, allow_ldynsym);
343 343 }
344 344 }
345 345
346 346 /*
347 347 * If we were only here to solicit debugging diagnostics, we're done.
348 348 */
349 349 if ((ofl->ofl_flags1 & FLG_OF1_IGNPRC) == 0)
350 350 return (1);
351 351
352 352 /*
353 353 * Scan all output relocations searching for those against discarded or
354 354 * ignored sections. If one is found, decrement the total outrel count.
355 355 */
356 356 REL_CACHE_TRAVERSE(&ofl->ofl_outrels, idx1, rcbp, rsp) {
357 357 Is_desc *isc = rsp->rel_isdesc;
358 358 uint_t flags, entsize;
359 359 Shdr *shdr;
360 360
361 361 if ((isc == NULL) || ((isc->is_flags & (FLG_IS_SECTREF))) ||
362 362 ((ifl = isc->is_file) == NULL) ||
363 363 ((ifl->ifl_flags & FLG_IF_IGNORE) == 0) ||
364 364 ((shdr = isc->is_shdr) == NULL) ||
365 365 ((shdr->sh_flags & SHF_ALLOC) == 0))
366 366 continue;
367 367
368 368 flags = rsp->rel_flags;
369 369
370 370 if (flags & (FLG_REL_GOT | FLG_REL_BSS |
371 371 FLG_REL_NOINFO | FLG_REL_PLT))
372 372 continue;
373 373
374 374 osp = RELAUX_GET_OSDESC(rsp);
375 375
376 376 if (rsp->rel_flags & FLG_REL_RELA)
377 377 entsize = sizeof (Rela);
378 378 else
379 379 entsize = sizeof (Rel);
380 380
381 381 assert(osp->os_szoutrels > 0);
382 382 osp->os_szoutrels -= entsize;
383 383
384 384 if (!(flags & FLG_REL_PLT))
385 385 ofl->ofl_reloccntsub++;
386 386
387 387 if (rsp->rel_rtype == ld_targ.t_m.m_r_relative)
388 388 ofl->ofl_relocrelcnt--;
389 389 }
390 390
391 391 /*
392 392 * As a result of our work here, the number of output sections may
393 393 * have decreased. Trigger a call to adjust_os_count().
394 394 */
395 395 ofl->ofl_flags |= FLG_OF_ADJOSCNT;
396 396
397 397 return (1);
398 398 }
399 399
400 400 /*
401 401 * Allocate Elf_Data, Shdr, and Is_desc structures for a new
402 402 * section.
403 403 *
404 404 * entry:
405 405 * ofl - Output file descriptor
406 406 * shtype - SHT_ type code for section.
407 407 * shname - String giving the name for the new section.
408 408 * entcnt - # of items contained in the data part of the new section.
409 409 * This value is multiplied against the known element size
410 410 * for the section type to determine the size of the data
411 411 * area for the section. It is only meaningful in cases where
412 412 * the section type has a non-zero element size. In other cases,
413 413 * the caller must set the size fields in the *ret_data and
414 414 * *ret_shdr structs manually.
415 415 * ret_isec, ret_shdr, ret_data - Address of pointers to
416 416 * receive address of newly allocated structs.
417 417 *
418 418 * exit:
419 419 * On error, returns S_ERROR. On success, returns (1), and the
420 420 * ret_ pointers have been updated to point at the new structures,
421 421 * which have been filled in. To finish the task, the caller must
422 422 * update any fields within the supplied descriptors that differ
423 423 * from its needs, and then call ld_place_section().
424 424 */
425 425 static uintptr_t
426 426 new_section(Ofl_desc *ofl, Word shtype, const char *shname, Xword entcnt,
427 427 Is_desc **ret_isec, Shdr **ret_shdr, Elf_Data **ret_data)
428 428 {
429 429 typedef struct sec_info {
430 430 Word d_type;
431 431 Word align; /* Used in both data and section header */
432 432 Word sh_flags;
433 433 Word sh_entsize;
434 434 } SEC_INFO_T;
435 435
436 436 const SEC_INFO_T *sec_info;
437 437
438 438 Shdr *shdr;
439 439 Elf_Data *data;
440 440 Is_desc *isec;
441 441 size_t size;
442 442
443 443 /*
444 444 * For each type of section, we have a distinct set of
445 445 * SEC_INFO_T values. This macro defines a static structure
446 446 * containing those values and generates code to set the sec_info
447 447 * pointer to refer to it. The pointer in sec_info remains valid
448 448 * outside of the declaration scope because the info_s struct is static.
449 449 *
450 450 * We can't determine the value of M_WORD_ALIGN at compile time, so
451 451 * a different variant is used for those cases.
452 452 */
453 453 #define SET_SEC_INFO(d_type, d_align, sh_flags, sh_entsize) \
454 454 { \
455 455 static const SEC_INFO_T info_s = { d_type, d_align, sh_flags, \
456 456 sh_entsize}; \
457 457 sec_info = &info_s; \
458 458 }
459 459 #define SET_SEC_INFO_WORD_ALIGN(d_type, sh_flags, sh_entsize) \
460 460 { \
461 461 static SEC_INFO_T info_s = { d_type, 0, sh_flags, \
462 462 sh_entsize}; \
463 463 info_s.align = ld_targ.t_m.m_word_align; \
464 464 sec_info = &info_s; \
465 465 }
466 466
467 467 switch (shtype) {
468 468 case SHT_PROGBITS:
469 469 /*
470 470 * SHT_PROGBITS sections contain are used for many
471 471 * different sections. Alignments and flags differ.
472 472 * Some have a standard entsize, and others don't.
473 473 * We set some defaults here, but there is no expectation
474 474 * that they are correct or complete for any specific
475 475 * purpose. The caller must provide the correct values.
476 476 */
477 477 SET_SEC_INFO_WORD_ALIGN(ELF_T_BYTE, SHF_ALLOC, 0)
478 478 break;
479 479
480 480 case SHT_SYMTAB:
481 481 SET_SEC_INFO_WORD_ALIGN(ELF_T_SYM, 0, sizeof (Sym))
482 482 break;
483 483
484 484 case SHT_DYNSYM:
485 485 SET_SEC_INFO_WORD_ALIGN(ELF_T_SYM, SHF_ALLOC, sizeof (Sym))
486 486 break;
487 487
488 488 case SHT_SUNW_LDYNSYM:
489 489 ofl->ofl_flags |= FLG_OF_OSABI;
490 490 SET_SEC_INFO_WORD_ALIGN(ELF_T_SYM, SHF_ALLOC, sizeof (Sym))
491 491 break;
492 492
493 493 case SHT_STRTAB:
494 494 /*
495 495 * A string table may or may not be allocable, depending
496 496 * on context, so we leave that flag unset and leave it to
497 497 * the caller to add it if necessary.
498 498 *
499 499 * String tables do not have a standard entsize, so
500 500 * we set it to 0.
501 501 */
502 502 SET_SEC_INFO(ELF_T_BYTE, 1, SHF_STRINGS, 0)
503 503 break;
504 504
505 505 case SHT_RELA:
506 506 /*
507 507 * Relocations with an addend (Everything except 32-bit X86).
508 508 * The caller is expected to set all section header flags.
509 509 */
510 510 SET_SEC_INFO_WORD_ALIGN(ELF_T_RELA, 0, sizeof (Rela))
511 511 break;
512 512
513 513 case SHT_REL:
514 514 /*
515 515 * Relocations without an addend (32-bit X86 only).
516 516 * The caller is expected to set all section header flags.
517 517 */
518 518 SET_SEC_INFO_WORD_ALIGN(ELF_T_REL, 0, sizeof (Rel))
519 519 break;
520 520
521 521 case SHT_HASH:
522 522 SET_SEC_INFO_WORD_ALIGN(ELF_T_WORD, SHF_ALLOC, sizeof (Word))
523 523 break;
524 524
525 525 case SHT_SUNW_symsort:
526 526 case SHT_SUNW_tlssort:
527 527 ofl->ofl_flags |= FLG_OF_OSABI;
528 528 SET_SEC_INFO_WORD_ALIGN(ELF_T_WORD, SHF_ALLOC, sizeof (Word))
529 529 break;
530 530
531 531 case SHT_DYNAMIC:
532 532 /*
533 533 * A dynamic section may or may not be allocable, and may or
534 534 * may not be writable, depending on context, so we leave the
535 535 * flags unset and leave it to the caller to add them if
536 536 * necessary.
537 537 */
538 538 SET_SEC_INFO_WORD_ALIGN(ELF_T_DYN, 0, sizeof (Dyn))
539 539 break;
540 540
541 541 case SHT_NOBITS:
542 542 /*
543 543 * SHT_NOBITS is used for BSS-type sections. The size and
544 544 * alignment depend on the specific use and must be adjusted
545 545 * by the caller.
546 546 */
547 547 SET_SEC_INFO(ELF_T_BYTE, 0, SHF_ALLOC | SHF_WRITE, 0)
548 548 break;
549 549
550 550 case SHT_INIT_ARRAY:
551 551 case SHT_FINI_ARRAY:
552 552 case SHT_PREINIT_ARRAY:
553 553 SET_SEC_INFO(ELF_T_ADDR, sizeof (Addr), SHF_ALLOC | SHF_WRITE,
554 554 sizeof (Addr))
555 555 break;
556 556
557 557 case SHT_SYMTAB_SHNDX:
558 558 /*
559 559 * Note that these sections are created to be associated
560 560 * with both symtab and dynsym symbol tables. However, they
561 561 * are non-allocable in all cases, because the runtime
562 562 * linker has no need for this information. It is purely
563 563 * informational, used by elfdump(1), debuggers, etc.
564 564 */
565 565 SET_SEC_INFO_WORD_ALIGN(ELF_T_WORD, 0, sizeof (Word));
566 566 break;
567 567
568 568 case SHT_SUNW_cap:
569 569 ofl->ofl_flags |= FLG_OF_OSABI;
570 570 SET_SEC_INFO_WORD_ALIGN(ELF_T_CAP, SHF_ALLOC, sizeof (Cap));
571 571 break;
572 572
573 573 case SHT_SUNW_capchain:
574 574 ofl->ofl_flags |= FLG_OF_OSABI;
575 575 SET_SEC_INFO_WORD_ALIGN(ELF_T_WORD, SHF_ALLOC,
576 576 sizeof (Capchain));
577 577 break;
578 578
579 579 case SHT_SUNW_capinfo:
580 580 ofl->ofl_flags |= FLG_OF_OSABI;
581 581 #if _ELF64
582 582 SET_SEC_INFO(ELF_T_XWORD, sizeof (Xword), SHF_ALLOC,
583 583 sizeof (Capinfo));
584 584 #else
585 585 SET_SEC_INFO(ELF_T_WORD, sizeof (Word), SHF_ALLOC,
586 586 sizeof (Capinfo));
587 587 #endif
588 588 break;
589 589
590 590 case SHT_SUNW_move:
591 591 ofl->ofl_flags |= FLG_OF_OSABI;
592 592 SET_SEC_INFO(ELF_T_BYTE, sizeof (Lword),
593 593 SHF_ALLOC | SHF_WRITE, sizeof (Move));
594 594 break;
595 595
596 596 case SHT_SUNW_syminfo:
597 597 ofl->ofl_flags |= FLG_OF_OSABI;
598 598 /*
599 599 * The sh_info field of the SHT_*_syminfo section points
600 600 * to the header index of the associated .dynamic section,
601 601 * so we also set SHF_INFO_LINK.
602 602 */
603 603 SET_SEC_INFO_WORD_ALIGN(ELF_T_BYTE,
604 604 SHF_ALLOC | SHF_INFO_LINK, sizeof (Syminfo));
605 605 break;
606 606
607 607 case SHT_SUNW_verneed:
608 608 case SHT_SUNW_verdef:
609 609 ofl->ofl_flags |= FLG_OF_OSABI;
610 610 /*
611 611 * The info for verneed and versym happen to be the same.
612 612 * The entries in these sections are not of uniform size,
613 613 * so we set the entsize to 0.
614 614 */
615 615 SET_SEC_INFO_WORD_ALIGN(ELF_T_BYTE, SHF_ALLOC, 0);
616 616 break;
617 617
618 618 case SHT_SUNW_versym:
619 619 ofl->ofl_flags |= FLG_OF_OSABI;
620 620 SET_SEC_INFO_WORD_ALIGN(ELF_T_BYTE, SHF_ALLOC,
621 621 sizeof (Versym));
622 622 break;
623 623
624 624 default:
625 625 /* Should not happen: fcn called with unknown section type */
626 626 assert(0);
627 627 return (S_ERROR);
628 628 }
629 629 #undef SET_SEC_INFO
630 630 #undef SET_SEC_INFO_WORD_ALIGN
631 631
632 632 size = entcnt * sec_info->sh_entsize;
633 633
634 634 /*
635 635 * Allocate and initialize the Elf_Data structure.
636 636 */
637 637 if ((data = libld_calloc(sizeof (Elf_Data), 1)) == NULL)
638 638 return (S_ERROR);
639 639 data->d_type = sec_info->d_type;
640 640 data->d_size = size;
641 641 data->d_align = sec_info->align;
642 642 data->d_version = ofl->ofl_dehdr->e_version;
643 643
644 644 /*
645 645 * Allocate and initialize the Shdr structure.
646 646 */
647 647 if ((shdr = libld_calloc(sizeof (Shdr), 1)) == NULL)
648 648 return (S_ERROR);
649 649 shdr->sh_type = shtype;
650 650 shdr->sh_size = size;
651 651 shdr->sh_flags = sec_info->sh_flags;
652 652 shdr->sh_addralign = sec_info->align;
653 653 shdr->sh_entsize = sec_info->sh_entsize;
654 654
655 655 /*
656 656 * Allocate and initialize the Is_desc structure.
657 657 */
658 658 if ((isec = libld_calloc(1, sizeof (Is_desc))) == NULL)
659 659 return (S_ERROR);
660 660 isec->is_name = shname;
661 661 isec->is_shdr = shdr;
662 662 isec->is_indata = data;
663 663
664 664
665 665 *ret_isec = isec;
666 666 *ret_shdr = shdr;
667 667 *ret_data = data;
668 668 return (1);
669 669 }
670 670
671 671 /*
672 672 * Use an existing input section as a template to create a new
673 673 * input section with the same values as the original, other than
674 674 * the size of the data area which is supplied by the caller.
675 675 *
676 676 * entry:
677 677 * ofl - Output file descriptor
678 678 * ifl - Input file section to use as a template
679 679 * size - Size of data area for new section
680 680 * ret_isec, ret_shdr, ret_data - Address of pointers to
681 681 * receive address of newly allocated structs.
682 682 *
683 683 * exit:
684 684 * On error, returns S_ERROR. On success, returns (1), and the
685 685 * ret_ pointers have been updated to point at the new structures,
686 686 * which have been filled in. To finish the task, the caller must
687 687 * update any fields within the supplied descriptors that differ
688 688 * from its needs, and then call ld_place_section().
689 689 */
690 690 static uintptr_t
691 691 new_section_from_template(Ofl_desc *ofl, Is_desc *tmpl_isp, size_t size,
692 692 Is_desc **ret_isec, Shdr **ret_shdr, Elf_Data **ret_data)
693 693 {
694 694 Shdr *shdr;
695 695 Elf_Data *data;
696 696 Is_desc *isec;
697 697
698 698 /*
699 699 * Allocate and initialize the Elf_Data structure.
700 700 */
701 701 if ((data = libld_calloc(sizeof (Elf_Data), 1)) == NULL)
702 702 return (S_ERROR);
703 703 data->d_type = tmpl_isp->is_indata->d_type;
704 704 data->d_size = size;
705 705 data->d_align = tmpl_isp->is_shdr->sh_addralign;
706 706 data->d_version = ofl->ofl_dehdr->e_version;
707 707
708 708 /*
709 709 * Allocate and initialize the Shdr structure.
710 710 */
711 711 if ((shdr = libld_malloc(sizeof (Shdr))) == NULL)
712 712 return (S_ERROR);
713 713 *shdr = *tmpl_isp->is_shdr;
714 714 shdr->sh_addr = 0;
715 715 shdr->sh_offset = 0;
716 716 shdr->sh_size = size;
717 717
718 718 /*
719 719 * Allocate and initialize the Is_desc structure.
720 720 */
721 721 if ((isec = libld_calloc(1, sizeof (Is_desc))) == NULL)
722 722 return (S_ERROR);
723 723 isec->is_name = tmpl_isp->is_name;
724 724 isec->is_shdr = shdr;
725 725 isec->is_indata = data;
726 726
727 727
728 728 *ret_isec = isec;
729 729 *ret_shdr = shdr;
730 730 *ret_data = data;
731 731 return (1);
732 732 }
733 733
734 734 /*
735 735 * Build a .bss section for allocation of tentative definitions. Any `static'
736 736 * .bss definitions would have been associated to their own .bss sections and
737 737 * thus collected from the input files. `global' .bss definitions are tagged
738 738 * as COMMON and do not cause any associated .bss section elements to be
739 739 * generated. Here we add up all these COMMON symbols and generate the .bss
740 740 * section required to represent them.
741 741 */
742 742 uintptr_t
743 743 ld_make_bss(Ofl_desc *ofl, Xword size, Xword align, uint_t ident)
744 744 {
745 745 Shdr *shdr;
746 746 Elf_Data *data;
747 747 Is_desc *isec;
748 748 Os_desc *osp;
749 749 Xword rsize = (Xword)ofl->ofl_relocbsssz;
750 750
751 751 /*
752 752 * Allocate header structs. We will set the name ourselves below,
753 753 * and there is no entcnt for a BSS. So, the shname and entcnt
754 754 * arguments are 0.
755 755 */
756 756 if (new_section(ofl, SHT_NOBITS, NULL, 0,
757 757 &isec, &shdr, &data) == S_ERROR)
758 758 return (S_ERROR);
759 759
760 760 data->d_size = (size_t)size;
761 761 data->d_align = (size_t)align;
762 762
763 763 shdr->sh_size = size;
764 764 shdr->sh_addralign = align;
765 765
766 766 if (ident == ld_targ.t_id.id_tlsbss) {
767 767 isec->is_name = MSG_ORIG(MSG_SCN_TBSS);
768 768 ofl->ofl_istlsbss = isec;
769 769 shdr->sh_flags |= SHF_TLS;
770 770
771 771 } else if (ident == ld_targ.t_id.id_bss) {
772 772 isec->is_name = MSG_ORIG(MSG_SCN_BSS);
773 773 ofl->ofl_isbss = isec;
774 774
775 775 #if defined(_ELF64)
776 776 } else if ((ld_targ.t_m.m_mach == EM_AMD64) &&
777 777 (ident == ld_targ.t_id.id_lbss)) {
778 778 isec->is_name = MSG_ORIG(MSG_SCN_LBSS);
779 779 ofl->ofl_islbss = isec;
780 780 shdr->sh_flags |= SHF_AMD64_LARGE;
781 781 #endif
782 782 }
783 783
784 784 /*
785 785 * Retain this .*bss input section as this will be where global symbol
786 786 * references are added.
787 787 */
788 788 if ((osp = ld_place_section(ofl, isec, NULL, ident, NULL)) ==
789 789 (Os_desc *)S_ERROR)
790 790 return (S_ERROR);
791 791
792 792 /*
793 793 * If relocations exist against a .*bss section, a section symbol must
794 794 * be created for the section in the .dynsym symbol table.
795 795 */
796 796 if (!(osp->os_flags & FLG_OS_OUTREL)) {
797 797 ofl_flag_t flagtotest;
798 798
799 799 if (ident == ld_targ.t_id.id_tlsbss)
800 800 flagtotest = FLG_OF1_TLSOREL;
801 801 else
802 802 flagtotest = FLG_OF1_BSSOREL;
803 803
804 804 if (ofl->ofl_flags1 & flagtotest) {
805 805 ofl->ofl_dynshdrcnt++;
806 806 osp->os_flags |= FLG_OS_OUTREL;
807 807 }
808 808 }
809 809
810 810 osp->os_szoutrels = rsize;
811 811 return (1);
812 812 }
813 813
814 814 /*
815 815 * Build a SHT_{INIT|FINI|PREINIT}ARRAY section (specified via
816 816 * ld -z *array=name).
817 817 */
818 818 static uintptr_t
819 819 make_array(Ofl_desc *ofl, Word shtype, const char *sectname, APlist *alp)
820 820 {
821 821 uint_t entcount;
822 822 Aliste idx;
823 823 Elf_Data *data;
824 824 Is_desc *isec;
825 825 Shdr *shdr;
826 826 Sym_desc *sdp;
827 827 Rel_desc reld;
828 828 Rela reloc;
829 829 Os_desc *osp;
830 830 uintptr_t ret = 1;
831 831
832 832 if (alp == NULL)
833 833 return (1);
834 834
835 835 entcount = 0;
836 836 for (APLIST_TRAVERSE(alp, idx, sdp))
837 837 entcount++;
838 838
839 839 if (new_section(ofl, shtype, sectname, entcount, &isec, &shdr, &data) ==
840 840 S_ERROR)
841 841 return (S_ERROR);
842 842
843 843 if ((data->d_buf = libld_calloc(sizeof (Addr), entcount)) == NULL)
844 844 return (S_ERROR);
845 845
846 846 if (ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_array, NULL) ==
847 847 (Os_desc *)S_ERROR)
848 848 return (S_ERROR);
849 849
850 850 osp = isec->is_osdesc;
851 851
852 852 if ((ofl->ofl_osinitarray == NULL) && (shtype == SHT_INIT_ARRAY))
853 853 ofl->ofl_osinitarray = osp;
854 854 if ((ofl->ofl_ospreinitarray == NULL) && (shtype == SHT_PREINIT_ARRAY))
855 855 ofl->ofl_ospreinitarray = osp;
856 856 else if ((ofl->ofl_osfiniarray == NULL) && (shtype == SHT_FINI_ARRAY))
857 857 ofl->ofl_osfiniarray = osp;
858 858
859 859 /*
860 860 * Create relocations against this section to initialize it to the
861 861 * function addresses.
862 862 */
863 863 reld.rel_isdesc = isec;
864 864 reld.rel_aux = NULL;
865 865 reld.rel_flags = FLG_REL_LOAD;
866 866
867 867 /*
868 868 * Fabricate the relocation information (as if a relocation record had
869 869 * been input - see init_rel()).
870 870 */
871 871 reld.rel_rtype = ld_targ.t_m.m_r_arrayaddr;
872 872 reld.rel_roffset = 0;
873 873 reld.rel_raddend = 0;
874 874
875 875 /*
876 876 * Create a minimal relocation record to satisfy process_sym_reloc()
877 877 * debugging requirements.
878 878 */
879 879 reloc.r_offset = 0;
880 880 reloc.r_info = ELF_R_INFO(0, ld_targ.t_m.m_r_arrayaddr);
881 881 reloc.r_addend = 0;
882 882
883 883 DBG_CALL(Dbg_reloc_generate(ofl->ofl_lml, osp,
884 884 ld_targ.t_m.m_rel_sht_type));
885 885 for (APLIST_TRAVERSE(alp, idx, sdp)) {
886 886 reld.rel_sym = sdp;
887 887
888 888 if (ld_process_sym_reloc(ofl, &reld, (Rel *)&reloc, isec,
889 889 MSG_INTL(MSG_STR_COMMAND), 0) == S_ERROR) {
890 890 ret = S_ERROR;
891 891 continue;
892 892 }
893 893
894 894 reld.rel_roffset += (Xword)sizeof (Addr);
895 895 reloc.r_offset = reld.rel_roffset;
896 896 }
897 897
898 898 return (ret);
899 899 }
900 900
901 901 /*
902 902 * Build a comment section (-Qy option).
903 903 */
904 904 static uintptr_t
905 905 make_comment(Ofl_desc *ofl)
906 906 {
907 907 Shdr *shdr;
908 908 Elf_Data *data;
909 909 Is_desc *isec;
910 910
911 911 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_COMMENT), 0,
912 912 &isec, &shdr, &data) == S_ERROR)
913 913 return (S_ERROR);
914 914
915 915 data->d_buf = (void *)ofl->ofl_sgsid;
916 916 data->d_size = strlen(ofl->ofl_sgsid) + 1;
917 917 data->d_align = 1;
918 918
919 919 shdr->sh_size = (Xword)data->d_size;
920 920 shdr->sh_flags = 0;
921 921 shdr->sh_addralign = 1;
922 922
923 923 return ((uintptr_t)ld_place_section(ofl, isec, NULL,
924 924 ld_targ.t_id.id_note, NULL));
925 925 }
926 926
927 927 /*
928 928 * Make the dynamic section. Calculate the size of any strings referenced
929 929 * within this structure, they will be added to the global string table
930 930 * (.dynstr). This routine should be called before make_dynstr().
931 931 *
932 932 * This routine must be maintained in parallel with update_odynamic()
933 933 * in update.c
934 934 */
935 935 static uintptr_t
936 936 make_dynamic(Ofl_desc *ofl)
937 937 {
938 938 Shdr *shdr;
939 939 Os_desc *osp;
940 940 Elf_Data *data;
941 941 Is_desc *isec;
942 942 size_t cnt = 0;
943 943 Aliste idx;
944 944 Ifl_desc *ifl;
945 945 Sym_desc *sdp;
946 946 size_t size;
947 947 Str_tbl *strtbl;
948 948 ofl_flag_t flags = ofl->ofl_flags;
949 949 int not_relobj = !(flags & FLG_OF_RELOBJ);
950 950 int unused = 0;
951 951
952 952 /*
953 953 * Select the required string table.
954 954 */
955 955 if (OFL_IS_STATIC_OBJ(ofl))
956 956 strtbl = ofl->ofl_strtab;
957 957 else
958 958 strtbl = ofl->ofl_dynstrtab;
959 959
960 960 /*
961 961 * Only a limited subset of DT_ entries apply to relocatable
962 962 * objects. See the comment at the head of update_odynamic() in
963 963 * update.c for details.
964 964 */
965 965 if (new_section(ofl, SHT_DYNAMIC, MSG_ORIG(MSG_SCN_DYNAMIC), 0,
966 966 &isec, &shdr, &data) == S_ERROR)
967 967 return (S_ERROR);
968 968
969 969 /*
970 970 * new_section() does not set SHF_ALLOC. If we're building anything
971 971 * besides a relocatable object, then the .dynamic section should
972 972 * reside in allocatable memory.
973 973 */
974 974 if (not_relobj)
975 975 shdr->sh_flags |= SHF_ALLOC;
976 976
977 977 /*
978 978 * new_section() does not set SHF_WRITE. If we're building an object
979 979 * that specifies an interpretor, then a DT_DEBUG entry is created,
980 980 * which is initialized to the applications link-map list at runtime.
981 981 */
982 982 if (ofl->ofl_osinterp)
983 983 shdr->sh_flags |= SHF_WRITE;
984 984
985 985 osp = ofl->ofl_osdynamic =
986 986 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_dynamic, NULL);
987 987
988 988 /*
989 989 * Reserve entries for any needed dependencies.
990 990 */
991 991 for (APLIST_TRAVERSE(ofl->ofl_sos, idx, ifl)) {
992 992 if (!(ifl->ifl_flags & (FLG_IF_NEEDED | FLG_IF_NEEDSTR)))
993 993 continue;
994 994
995 995 /*
996 996 * If this dependency didn't satisfy any symbol references,
997 997 * generate a debugging diagnostic (ld(1) -Dunused can be used
998 998 * to display these). If this is a standard needed dependency,
999 999 * and -z ignore is in effect, drop the dependency. Explicitly
1000 1000 * defined dependencies (i.e., -N dep) don't get dropped, and
1001 1001 * are flagged as being required to simplify update_odynamic()
1002 1002 * processing.
1003 1003 */
1004 1004 if ((ifl->ifl_flags & FLG_IF_NEEDSTR) ||
1005 1005 ((ifl->ifl_flags & FLG_IF_DEPREQD) == 0)) {
1006 1006 if (unused++ == 0)
1007 1007 DBG_CALL(Dbg_util_nl(ofl->ofl_lml, DBG_NL_STD));
1008 1008 DBG_CALL(Dbg_unused_file(ofl->ofl_lml, ifl->ifl_soname,
1009 1009 (ifl->ifl_flags & FLG_IF_NEEDSTR), 0));
1010 1010
1011 1011 /*
1012 1012 * Guidance: Remove unused dependency.
1013 1013 *
1014 1014 * If -z ignore is in effect, this warning is not
1015 1015 * needed because we will quietly remove the unused
1016 1016 * dependency.
1017 1017 */
1018 1018 if (OFL_GUIDANCE(ofl, FLG_OFG_NO_UNUSED) &&
1019 1019 ((ifl->ifl_flags & FLG_IF_IGNORE) == 0))
1020 1020 ld_eprintf(ofl, ERR_GUIDANCE,
1021 1021 MSG_INTL(MSG_GUIDE_UNUSED),
1022 1022 ifl->ifl_soname);
1023 1023
1024 1024 if (ifl->ifl_flags & FLG_IF_NEEDSTR)
1025 1025 ifl->ifl_flags |= FLG_IF_DEPREQD;
1026 1026 else if (ifl->ifl_flags & FLG_IF_IGNORE)
1027 1027 continue;
1028 1028 }
1029 1029
1030 1030 /*
1031 1031 * If this object requires a DT_POSFLAG_1 entry, reserve it.
1032 1032 */
1033 1033 if ((ifl->ifl_flags & MSK_IF_POSFLAG1) && not_relobj)
1034 1034 cnt++;
1035 1035
1036 1036 if (st_insert(strtbl, ifl->ifl_soname) == -1)
1037 1037 return (S_ERROR);
1038 1038 cnt++;
1039 1039
1040 1040 /*
1041 1041 * If the needed entry contains the $ORIGIN token make sure
1042 1042 * the associated DT_1_FLAGS entry is created.
1043 1043 */
1044 1044 if (strstr(ifl->ifl_soname, MSG_ORIG(MSG_STR_ORIGIN))) {
1045 1045 ofl->ofl_dtflags_1 |= DF_1_ORIGIN;
1046 1046 ofl->ofl_dtflags |= DF_ORIGIN;
1047 1047 }
1048 1048 }
1049 1049
1050 1050 if (unused)
1051 1051 DBG_CALL(Dbg_util_nl(ofl->ofl_lml, DBG_NL_STD));
1052 1052
1053 1053 if (not_relobj) {
1054 1054 /*
1055 1055 * Reserve entries for any per-symbol auxiliary/filter strings.
1056 1056 */
1057 1057 cnt += alist_nitems(ofl->ofl_dtsfltrs);
1058 1058
1059 1059 /*
1060 1060 * Reserve entries for _init() and _fini() section addresses.
1061 1061 */
1062 1062 if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_INIT_U),
1063 1063 SYM_NOHASH, NULL, ofl)) != NULL) &&
1064 1064 (sdp->sd_ref == REF_REL_NEED) &&
1065 1065 (sdp->sd_sym->st_shndx != SHN_UNDEF)) {
1066 1066 sdp->sd_flags |= FLG_SY_UPREQD;
1067 1067 cnt++;
1068 1068 }
1069 1069 if (((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_FINI_U),
1070 1070 SYM_NOHASH, NULL, ofl)) != NULL) &&
1071 1071 (sdp->sd_ref == REF_REL_NEED) &&
1072 1072 (sdp->sd_sym->st_shndx != SHN_UNDEF)) {
1073 1073 sdp->sd_flags |= FLG_SY_UPREQD;
1074 1074 cnt++;
1075 1075 }
1076 1076
1077 1077 /*
1078 1078 * Reserve entries for any soname, filter name (shared libs
1079 1079 * only), run-path pointers, cache names and audit requirements.
1080 1080 */
1081 1081 if (ofl->ofl_soname) {
1082 1082 cnt++;
1083 1083 if (st_insert(strtbl, ofl->ofl_soname) == -1)
1084 1084 return (S_ERROR);
1085 1085 }
1086 1086 if (ofl->ofl_filtees) {
1087 1087 cnt++;
1088 1088 if (st_insert(strtbl, ofl->ofl_filtees) == -1)
1089 1089 return (S_ERROR);
1090 1090
1091 1091 /*
1092 1092 * If the filtees entry contains the $ORIGIN token
1093 1093 * make sure the associated DT_1_FLAGS entry is created.
1094 1094 */
1095 1095 if (strstr(ofl->ofl_filtees,
1096 1096 MSG_ORIG(MSG_STR_ORIGIN))) {
1097 1097 ofl->ofl_dtflags_1 |= DF_1_ORIGIN;
1098 1098 ofl->ofl_dtflags |= DF_ORIGIN;
1099 1099 }
1100 1100 }
1101 1101 }
1102 1102
1103 1103 if (ofl->ofl_rpath) {
1104 1104 cnt += 2; /* DT_RPATH & DT_RUNPATH */
1105 1105 if (st_insert(strtbl, ofl->ofl_rpath) == -1)
1106 1106 return (S_ERROR);
1107 1107
1108 1108 /*
1109 1109 * If the rpath entry contains the $ORIGIN token make sure
1110 1110 * the associated DT_1_FLAGS entry is created.
1111 1111 */
1112 1112 if (strstr(ofl->ofl_rpath, MSG_ORIG(MSG_STR_ORIGIN))) {
1113 1113 ofl->ofl_dtflags_1 |= DF_1_ORIGIN;
1114 1114 ofl->ofl_dtflags |= DF_ORIGIN;
1115 1115 }
1116 1116 }
1117 1117
1118 1118 if (not_relobj) {
1119 1119 Aliste idx;
1120 1120 Sg_desc *sgp;
1121 1121
1122 1122 if (ofl->ofl_config) {
1123 1123 cnt++;
1124 1124 if (st_insert(strtbl, ofl->ofl_config) == -1)
1125 1125 return (S_ERROR);
1126 1126
1127 1127 /*
1128 1128 * If the config entry contains the $ORIGIN token
1129 1129 * make sure the associated DT_1_FLAGS entry is created.
1130 1130 */
1131 1131 if (strstr(ofl->ofl_config, MSG_ORIG(MSG_STR_ORIGIN))) {
1132 1132 ofl->ofl_dtflags_1 |= DF_1_ORIGIN;
1133 1133 ofl->ofl_dtflags |= DF_ORIGIN;
1134 1134 }
1135 1135 }
1136 1136 if (ofl->ofl_depaudit) {
1137 1137 cnt++;
1138 1138 if (st_insert(strtbl, ofl->ofl_depaudit) == -1)
1139 1139 return (S_ERROR);
1140 1140 }
1141 1141 if (ofl->ofl_audit) {
1142 1142 cnt++;
1143 1143 if (st_insert(strtbl, ofl->ofl_audit) == -1)
1144 1144 return (S_ERROR);
1145 1145 }
1146 1146
1147 1147 /*
1148 1148 * Reserve entries for the DT_HASH, DT_STRTAB, DT_STRSZ,
1149 1149 * DT_SYMTAB, DT_SYMENT, and DT_CHECKSUM.
1150 1150 */
1151 1151 cnt += 6;
1152 1152
1153 1153 /*
1154 1154 * If we are including local functions at the head of
1155 1155 * the dynsym, then also reserve entries for DT_SUNW_SYMTAB
1156 1156 * and DT_SUNW_SYMSZ.
1157 1157 */
1158 1158 if (OFL_ALLOW_LDYNSYM(ofl))
1159 1159 cnt += 2;
1160 1160
1161 1161 if ((ofl->ofl_dynsymsortcnt > 0) ||
1162 1162 (ofl->ofl_dyntlssortcnt > 0))
1163 1163 cnt++; /* DT_SUNW_SORTENT */
1164 1164
1165 1165 if (ofl->ofl_dynsymsortcnt > 0)
1166 1166 cnt += 2; /* DT_SUNW_[SYMSORT|SYMSORTSZ] */
1167 1167
1168 1168 if (ofl->ofl_dyntlssortcnt > 0)
1169 1169 cnt += 2; /* DT_SUNW_[TLSSORT|TLSSORTSZ] */
1170 1170
1171 1171 if ((flags & (FLG_OF_VERDEF | FLG_OF_NOVERSEC)) ==
1172 1172 FLG_OF_VERDEF)
1173 1173 cnt += 2; /* DT_VERDEF & DT_VERDEFNUM */
1174 1174
1175 1175 if ((flags & (FLG_OF_VERNEED | FLG_OF_NOVERSEC)) ==
1176 1176 FLG_OF_VERNEED)
1177 1177 cnt += 2; /* DT_VERNEED & DT_VERNEEDNUM */
1178 1178
1179 1179 if ((flags & FLG_OF_COMREL) && ofl->ofl_relocrelcnt)
1180 1180 cnt++; /* DT_RELACOUNT */
1181 1181
1182 1182 if (flags & FLG_OF_TEXTREL) /* DT_TEXTREL */
1183 1183 cnt++;
1184 1184
1185 1185 if (ofl->ofl_osfiniarray) /* DT_FINI_ARRAY */
1186 1186 cnt += 2; /* DT_FINI_ARRAYSZ */
1187 1187
1188 1188 if (ofl->ofl_osinitarray) /* DT_INIT_ARRAY */
1189 1189 cnt += 2; /* DT_INIT_ARRAYSZ */
1190 1190
1191 1191 if (ofl->ofl_ospreinitarray) /* DT_PREINIT_ARRAY & */
1192 1192 cnt += 2; /* DT_PREINIT_ARRAYSZ */
1193 1193
1194 1194 /*
1195 1195 * If we have plt's reserve a DT_PLTRELSZ, DT_PLTREL and
1196 1196 * DT_JMPREL.
1197 1197 */
1198 1198 if (ofl->ofl_pltcnt)
1199 1199 cnt += 3;
1200 1200
1201 1201 /*
1202 1202 * If plt padding is needed (Sparcv9).
1203 1203 */
1204 1204 if (ofl->ofl_pltpad)
1205 1205 cnt += 2; /* DT_PLTPAD & DT_PLTPADSZ */
1206 1206
1207 1207 /*
1208 1208 * If we have any relocations reserve a DT_REL, DT_RELSZ and
1209 1209 * DT_RELENT entry.
1210 1210 */
1211 1211 if (ofl->ofl_relocsz)
1212 1212 cnt += 3;
1213 1213
1214 1214 /*
1215 1215 * If a syminfo section is required create DT_SYMINFO,
1216 1216 * DT_SYMINSZ, and DT_SYMINENT entries.
1217 1217 */
1218 1218 if (flags & FLG_OF_SYMINFO)
1219 1219 cnt += 3;
1220 1220
1221 1221 /*
1222 1222 * If there are any partially initialized sections allocate
1223 1223 * DT_MOVETAB, DT_MOVESZ and DT_MOVEENT.
1224 1224 */
1225 1225 if (ofl->ofl_osmove)
1226 1226 cnt += 3;
1227 1227
1228 1228 /*
1229 1229 * Allocate one DT_REGISTER entry for every register symbol.
1230 1230 */
1231 1231 cnt += ofl->ofl_regsymcnt;
1232 1232
1233 1233 /*
1234 1234 * Reserve a entry for each '-zrtldinfo=...' specified
1235 1235 * on the command line.
1236 1236 */
1237 1237 for (APLIST_TRAVERSE(ofl->ofl_rtldinfo, idx, sdp))
1238 1238 cnt++;
1239 1239
1240 1240 /*
1241 1241 * The following entry should only be placed in a segment that
1242 1242 * is writable.
1243 1243 */
1244 1244 if (((sgp = osp->os_sgdesc) != NULL) &&
1245 1245 (sgp->sg_phdr.p_flags & PF_W) && ofl->ofl_osinterp)
1246 1246 cnt++; /* DT_DEBUG */
1247 1247
1248 1248 /*
1249 1249 * Capabilities require a .dynamic entry for the .SUNW_cap
1250 1250 * section.
1251 1251 */
1252 1252 if (ofl->ofl_oscap)
1253 1253 cnt++; /* DT_SUNW_CAP */
1254 1254
1255 1255 /*
1256 1256 * Symbol capabilities require a .dynamic entry for the
1257 1257 * .SUNW_capinfo section.
1258 1258 */
1259 1259 if (ofl->ofl_oscapinfo)
1260 1260 cnt++; /* DT_SUNW_CAPINFO */
1261 1261
1262 1262 /*
1263 1263 * Capabilities chain information requires a .SUNW_capchain
1264 1264 * entry (DT_SUNW_CAPCHAIN), entry size (DT_SUNW_CAPCHAINENT),
1265 1265 * and total size (DT_SUNW_CAPCHAINSZ).
1266 1266 */
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1267 1267 if (ofl->ofl_oscapchain)
1268 1268 cnt += 3;
1269 1269
1270 1270 if (flags & FLG_OF_SYMBOLIC)
1271 1271 cnt++; /* DT_SYMBOLIC */
1272 1272
1273 1273 if (ofl->ofl_aslr != 0) /* DT_SUNW_ASLR */
1274 1274 cnt++;
1275 1275 }
1276 1276
1277 + if (ofl->ofl_flags & FLG_OF_KMOD)
1278 + cnt++;
1279 +
1277 1280 /*
1278 1281 * Account for Architecture dependent .dynamic entries, and defaults.
1279 1282 */
1280 1283 (*ld_targ.t_mr.mr_mach_make_dynamic)(ofl, &cnt);
1281 1284
1282 1285 /*
1283 1286 * DT_FLAGS, DT_FLAGS_1, DT_SUNW_STRPAD, and DT_NULL. Also,
1284 1287 * allow room for the unused extra DT_NULLs. These are included
1285 1288 * to allow an ELF editor room to add items later.
1286 1289 */
1287 1290 cnt += 4 + DYNAMIC_EXTRA_ELTS;
1288 1291
1289 1292 /*
1290 1293 * DT_SUNW_LDMACH. Used to hold the ELF machine code of the
1291 1294 * linker that produced the output object. This information
1292 1295 * allows us to determine whether a given object was linked
1293 1296 * natively, or by a linker running on a different type of
1294 1297 * system. This information can be valuable if one suspects
1295 1298 * that a problem might be due to alignment or byte order issues.
1296 1299 */
1297 1300 cnt++;
1298 1301
1299 1302 /*
1300 1303 * Determine the size of the section from the number of entries.
1301 1304 */
1302 1305 size = cnt * (size_t)shdr->sh_entsize;
1303 1306
1304 1307 shdr->sh_size = (Xword)size;
1305 1308 data->d_size = size;
1306 1309
1307 1310 /*
1308 1311 * There are several tags that are specific to the Solaris osabi
1309 1312 * range which we unconditionally put into any dynamic section
1310 1313 * we create (e.g. DT_SUNW_STRPAD or DT_SUNW_LDMACH). As such,
1311 1314 * any Solaris object with a dynamic section should be tagged as
1312 1315 * ELFOSABI_SOLARIS.
1313 1316 */
1314 1317 ofl->ofl_flags |= FLG_OF_OSABI;
1315 1318
1316 1319 return ((uintptr_t)ofl->ofl_osdynamic);
1317 1320 }
1318 1321
1319 1322 /*
1320 1323 * Build the GOT section and its associated relocation entries.
1321 1324 */
1322 1325 uintptr_t
1323 1326 ld_make_got(Ofl_desc *ofl)
1324 1327 {
1325 1328 Elf_Data *data;
1326 1329 Shdr *shdr;
1327 1330 Is_desc *isec;
1328 1331 size_t size = (size_t)ofl->ofl_gotcnt * ld_targ.t_m.m_got_entsize;
1329 1332 size_t rsize = (size_t)ofl->ofl_relocgotsz;
1330 1333
1331 1334 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_GOT), 0,
1332 1335 &isec, &shdr, &data) == S_ERROR)
1333 1336 return (S_ERROR);
1334 1337
1335 1338 data->d_size = size;
1336 1339
1337 1340 shdr->sh_flags |= SHF_WRITE;
1338 1341 shdr->sh_size = (Xword)size;
1339 1342 shdr->sh_entsize = ld_targ.t_m.m_got_entsize;
1340 1343
1341 1344 ofl->ofl_osgot = ld_place_section(ofl, isec, NULL,
1342 1345 ld_targ.t_id.id_got, NULL);
1343 1346 if (ofl->ofl_osgot == (Os_desc *)S_ERROR)
1344 1347 return (S_ERROR);
1345 1348
1346 1349 ofl->ofl_osgot->os_szoutrels = (Xword)rsize;
1347 1350
1348 1351 return (1);
1349 1352 }
1350 1353
1351 1354 /*
1352 1355 * Build an interpreter section.
1353 1356 */
1354 1357 static uintptr_t
1355 1358 make_interp(Ofl_desc *ofl)
1356 1359 {
1357 1360 Shdr *shdr;
1358 1361 Elf_Data *data;
1359 1362 Is_desc *isec;
1360 1363 const char *iname = ofl->ofl_interp;
1361 1364 size_t size;
1362 1365
1363 1366 /*
1364 1367 * If -z nointerp is in effect, don't create an interpreter section.
1365 1368 */
1366 1369 if (ofl->ofl_flags1 & FLG_OF1_NOINTRP)
1367 1370 return (1);
1368 1371
1369 1372 /*
1370 1373 * An .interp section is always created for a dynamic executable.
1371 1374 * A user can define the interpreter to use. This definition overrides
1372 1375 * the default that would be recorded in an executable, and triggers
1373 1376 * the creation of an .interp section in any other object. Presumably
1374 1377 * the user knows what they are doing. Refer to the generic ELF ABI
1375 1378 * section 5-4, and the ld(1) -I option.
1376 1379 */
1377 1380 if (((ofl->ofl_flags & (FLG_OF_DYNAMIC | FLG_OF_EXEC |
1378 1381 FLG_OF_RELOBJ)) != (FLG_OF_DYNAMIC | FLG_OF_EXEC)) && !iname)
1379 1382 return (1);
1380 1383
1381 1384 /*
1382 1385 * In the case of a dynamic executable, supply a default interpreter
1383 1386 * if the user has not specified their own.
1384 1387 */
1385 1388 if (iname == NULL)
1386 1389 iname = ofl->ofl_interp = ld_targ.t_m.m_def_interp;
1387 1390
1388 1391 size = strlen(iname) + 1;
1389 1392
1390 1393 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_INTERP), 0,
1391 1394 &isec, &shdr, &data) == S_ERROR)
1392 1395 return (S_ERROR);
1393 1396
1394 1397 data->d_size = size;
1395 1398 shdr->sh_size = (Xword)size;
1396 1399 data->d_align = shdr->sh_addralign = 1;
1397 1400
1398 1401 ofl->ofl_osinterp =
1399 1402 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_interp, NULL);
1400 1403 return ((uintptr_t)ofl->ofl_osinterp);
1401 1404 }
1402 1405
1403 1406 /*
1404 1407 * Common function used to build the SHT_SUNW_versym section, SHT_SUNW_syminfo
1405 1408 * section, and SHT_SUNW_capinfo section. Each of these sections provide
1406 1409 * additional symbol information, and their size parallels the associated
1407 1410 * symbol table.
1408 1411 */
1409 1412 static Os_desc *
1410 1413 make_sym_sec(Ofl_desc *ofl, const char *sectname, Word stype, int ident)
1411 1414 {
1412 1415 Shdr *shdr;
1413 1416 Elf_Data *data;
1414 1417 Is_desc *isec;
1415 1418
1416 1419 /*
1417 1420 * We don't know the size of this section yet, so set it to 0. The
1418 1421 * size gets filled in after the associated symbol table is sized.
1419 1422 */
1420 1423 if (new_section(ofl, stype, sectname, 0, &isec, &shdr, &data) ==
1421 1424 S_ERROR)
1422 1425 return ((Os_desc *)S_ERROR);
1423 1426
1424 1427 return (ld_place_section(ofl, isec, NULL, ident, NULL));
1425 1428 }
1426 1429
1427 1430 /*
1428 1431 * Determine whether a symbol capability is redundant because the object
1429 1432 * capabilities are more restrictive.
1430 1433 */
1431 1434 inline static int
1432 1435 is_cap_redundant(Objcapset *ocapset, Objcapset *scapset)
1433 1436 {
1434 1437 Alist *oalp, *salp;
1435 1438 elfcap_mask_t omsk, smsk;
1436 1439
1437 1440 /*
1438 1441 * Inspect any platform capabilities. If the object defines platform
1439 1442 * capabilities, then the object will only be loaded for those
1440 1443 * platforms. A symbol capability set that doesn't define the same
1441 1444 * platforms is redundant, and a symbol capability that does not provide
1442 1445 * at least one platform name that matches a platform name in the object
1443 1446 * capabilities will never execute (as the object wouldn't have been
1444 1447 * loaded).
1445 1448 */
1446 1449 oalp = ocapset->oc_plat.cl_val;
1447 1450 salp = scapset->oc_plat.cl_val;
1448 1451 if (oalp && ((salp == NULL) || cap_names_match(oalp, salp)))
1449 1452 return (1);
1450 1453
1451 1454 /*
1452 1455 * If the symbol capability set defines platforms, and the object
1453 1456 * doesn't, then the symbol set is more restrictive.
1454 1457 */
1455 1458 if (salp && (oalp == NULL))
1456 1459 return (0);
1457 1460
1458 1461 /*
1459 1462 * Next, inspect any machine name capabilities. If the object defines
1460 1463 * machine name capabilities, then the object will only be loaded for
1461 1464 * those machines. A symbol capability set that doesn't define the same
1462 1465 * machine names is redundant, and a symbol capability that does not
1463 1466 * provide at least one machine name that matches a machine name in the
1464 1467 * object capabilities will never execute (as the object wouldn't have
1465 1468 * been loaded).
1466 1469 */
1467 1470 oalp = ocapset->oc_plat.cl_val;
1468 1471 salp = scapset->oc_plat.cl_val;
1469 1472 if (oalp && ((salp == NULL) || cap_names_match(oalp, salp)))
1470 1473 return (1);
1471 1474
1472 1475 /*
1473 1476 * If the symbol capability set defines machine names, and the object
1474 1477 * doesn't, then the symbol set is more restrictive.
1475 1478 */
1476 1479 if (salp && (oalp == NULL))
1477 1480 return (0);
1478 1481
1479 1482 /*
1480 1483 * Next, inspect any hardware capabilities. If the objects hardware
1481 1484 * capabilities are greater than or equal to that of the symbols
1482 1485 * capabilities, then the symbol capability set is redundant. If the
1483 1486 * symbols hardware capabilities are greater that the objects, then the
1484 1487 * symbol set is more restrictive.
1485 1488 *
1486 1489 * Note that this is a somewhat arbitrary definition, as each capability
1487 1490 * bit is independent of the others, and some of the higher order bits
1488 1491 * could be considered to be less important than lower ones. However,
1489 1492 * this is the only reasonable non-subjective definition.
1490 1493 */
1491 1494 omsk = ocapset->oc_hw_2.cm_val;
1492 1495 smsk = scapset->oc_hw_2.cm_val;
1493 1496 if ((omsk > smsk) || (omsk && (omsk == smsk)))
1494 1497 return (1);
1495 1498 if (omsk < smsk)
1496 1499 return (0);
1497 1500
1498 1501 /*
1499 1502 * Finally, inspect the remaining hardware capabilities.
1500 1503 */
1501 1504 omsk = ocapset->oc_hw_1.cm_val;
1502 1505 smsk = scapset->oc_hw_1.cm_val;
1503 1506 if ((omsk > smsk) || (omsk && (omsk == smsk)))
1504 1507 return (1);
1505 1508
1506 1509 return (0);
1507 1510 }
1508 1511
1509 1512 /*
1510 1513 * Capabilities values might have been assigned excluded values. These
1511 1514 * excluded values should be removed before calculating any capabilities
1512 1515 * sections size.
1513 1516 */
1514 1517 static void
1515 1518 capmask_value(Lm_list *lml, Word type, Capmask *capmask, int *title)
1516 1519 {
1517 1520 /*
1518 1521 * First determine whether any bits should be excluded.
1519 1522 */
1520 1523 if ((capmask->cm_val & capmask->cm_exc) == 0)
1521 1524 return;
1522 1525
1523 1526 DBG_CALL(Dbg_cap_post_title(lml, title));
1524 1527
1525 1528 DBG_CALL(Dbg_cap_val_entry(lml, DBG_STATE_CURRENT, type,
1526 1529 capmask->cm_val, ld_targ.t_m.m_mach));
1527 1530 DBG_CALL(Dbg_cap_val_entry(lml, DBG_STATE_EXCLUDE, type,
1528 1531 capmask->cm_exc, ld_targ.t_m.m_mach));
1529 1532
1530 1533 capmask->cm_val &= ~capmask->cm_exc;
1531 1534
1532 1535 DBG_CALL(Dbg_cap_val_entry(lml, DBG_STATE_RESOLVED, type,
1533 1536 capmask->cm_val, ld_targ.t_m.m_mach));
1534 1537 }
1535 1538
1536 1539 static void
1537 1540 capstr_value(Lm_list *lml, Word type, Caplist *caplist, int *title)
1538 1541 {
1539 1542 Aliste idx1, idx2;
1540 1543 char *estr;
1541 1544 Capstr *capstr;
1542 1545 Boolean found = FALSE;
1543 1546
1544 1547 /*
1545 1548 * First determine whether any strings should be excluded.
1546 1549 */
1547 1550 for (APLIST_TRAVERSE(caplist->cl_exc, idx1, estr)) {
1548 1551 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1549 1552 if (strcmp(estr, capstr->cs_str) == 0) {
1550 1553 found = TRUE;
1551 1554 break;
1552 1555 }
1553 1556 }
1554 1557 }
1555 1558
1556 1559 if (found == FALSE)
1557 1560 return;
1558 1561
1559 1562 /*
1560 1563 * Traverse the current strings, then delete the excluded strings,
1561 1564 * and finally display the resolved strings.
1562 1565 */
1563 1566 if (DBG_ENABLED) {
1564 1567 Dbg_cap_post_title(lml, title);
1565 1568 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1566 1569 Dbg_cap_ptr_entry(lml, DBG_STATE_CURRENT, type,
1567 1570 capstr->cs_str);
1568 1571 }
1569 1572 }
1570 1573 for (APLIST_TRAVERSE(caplist->cl_exc, idx1, estr)) {
1571 1574 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1572 1575 if (strcmp(estr, capstr->cs_str) == 0) {
1573 1576 DBG_CALL(Dbg_cap_ptr_entry(lml,
1574 1577 DBG_STATE_EXCLUDE, type, capstr->cs_str));
1575 1578 alist_delete(caplist->cl_val, &idx2);
1576 1579 break;
1577 1580 }
1578 1581 }
1579 1582 }
1580 1583 if (DBG_ENABLED) {
1581 1584 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1582 1585 Dbg_cap_ptr_entry(lml, DBG_STATE_RESOLVED, type,
1583 1586 capstr->cs_str);
1584 1587 }
1585 1588 }
1586 1589 }
1587 1590
1588 1591 /*
1589 1592 * Build a capabilities section.
1590 1593 */
1591 1594 #define CAP_UPDATE(cap, capndx, tag, val) \
1592 1595 cap->c_tag = tag; \
1593 1596 cap->c_un.c_val = val; \
1594 1597 cap++, capndx++;
1595 1598
1596 1599 static uintptr_t
1597 1600 make_cap(Ofl_desc *ofl, Word shtype, const char *shname, int ident)
1598 1601 {
1599 1602 Shdr *shdr;
1600 1603 Elf_Data *data;
1601 1604 Is_desc *isec;
1602 1605 Cap *cap;
1603 1606 size_t size = 0;
1604 1607 Word capndx = 0;
1605 1608 Str_tbl *strtbl;
1606 1609 Objcapset *ocapset = &ofl->ofl_ocapset;
1607 1610 Aliste idx1;
1608 1611 Capstr *capstr;
1609 1612 int title = 0;
1610 1613
1611 1614 /*
1612 1615 * Determine which string table to use for any CA_SUNW_MACH,
1613 1616 * CA_SUNW_PLAT, or CA_SUNW_ID strings.
1614 1617 */
1615 1618 if (OFL_IS_STATIC_OBJ(ofl))
1616 1619 strtbl = ofl->ofl_strtab;
1617 1620 else
1618 1621 strtbl = ofl->ofl_dynstrtab;
1619 1622
1620 1623 /*
1621 1624 * If symbol capabilities have been requested, but none have been
1622 1625 * created, warn the user. This scenario can occur if none of the
1623 1626 * input relocatable objects defined any object capabilities.
1624 1627 */
1625 1628 if ((ofl->ofl_flags & FLG_OF_OTOSCAP) && (ofl->ofl_capsymcnt == 0))
1626 1629 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_CAP_NOSYMSFOUND));
1627 1630
1628 1631 /*
1629 1632 * If symbol capabilities have been collected, but no symbols are left
1630 1633 * referencing these capabilities, promote the capability groups back
1631 1634 * to an object capability definition.
1632 1635 */
1633 1636 if ((ofl->ofl_flags & FLG_OF_OTOSCAP) && ofl->ofl_capsymcnt &&
1634 1637 (ofl->ofl_capfamilies == NULL)) {
1635 1638 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_CAP_NOSYMSFOUND));
1636 1639 ld_cap_move_symtoobj(ofl);
1637 1640 ofl->ofl_capsymcnt = 0;
1638 1641 ofl->ofl_capgroups = NULL;
1639 1642 ofl->ofl_flags &= ~FLG_OF_OTOSCAP;
1640 1643 }
1641 1644
1642 1645 /*
1643 1646 * Remove any excluded capabilities.
1644 1647 */
1645 1648 capstr_value(ofl->ofl_lml, CA_SUNW_PLAT, &ocapset->oc_plat, &title);
1646 1649 capstr_value(ofl->ofl_lml, CA_SUNW_MACH, &ocapset->oc_mach, &title);
1647 1650 capmask_value(ofl->ofl_lml, CA_SUNW_HW_2, &ocapset->oc_hw_2, &title);
1648 1651 capmask_value(ofl->ofl_lml, CA_SUNW_HW_1, &ocapset->oc_hw_1, &title);
1649 1652 capmask_value(ofl->ofl_lml, CA_SUNW_SF_1, &ocapset->oc_sf_1, &title);
1650 1653
1651 1654 /*
1652 1655 * Determine how many entries are required for any object capabilities.
1653 1656 */
1654 1657 size += alist_nitems(ocapset->oc_plat.cl_val);
1655 1658 size += alist_nitems(ocapset->oc_mach.cl_val);
1656 1659 if (ocapset->oc_hw_2.cm_val)
1657 1660 size++;
1658 1661 if (ocapset->oc_hw_1.cm_val)
1659 1662 size++;
1660 1663 if (ocapset->oc_sf_1.cm_val)
1661 1664 size++;
1662 1665
1663 1666 /*
1664 1667 * Only identify a capabilities group if the group has content. If a
1665 1668 * capabilities identifier exists, and no other capabilities have been
1666 1669 * supplied, remove the identifier. This scenario could exist if a
1667 1670 * user mistakenly defined a lone identifier, or if an identified group
1668 1671 * was overridden so as to clear the existing capabilities and the
1669 1672 * identifier was not also cleared.
1670 1673 */
1671 1674 if (ocapset->oc_id.cs_str) {
1672 1675 if (size)
1673 1676 size++;
1674 1677 else
1675 1678 ocapset->oc_id.cs_str = NULL;
1676 1679 }
1677 1680 if (size)
1678 1681 size++; /* Add CA_SUNW_NULL */
1679 1682
1680 1683 /*
1681 1684 * Determine how many entries are required for any symbol capabilities.
1682 1685 */
1683 1686 if (ofl->ofl_capsymcnt) {
1684 1687 /*
1685 1688 * If there are no object capabilities, a CA_SUNW_NULL entry
1686 1689 * is required before any symbol capabilities.
1687 1690 */
1688 1691 if (size == 0)
1689 1692 size++;
1690 1693 size += ofl->ofl_capsymcnt;
1691 1694 }
1692 1695
1693 1696 if (size == 0)
1694 1697 return (NULL);
1695 1698
1696 1699 if (new_section(ofl, shtype, shname, size, &isec,
1697 1700 &shdr, &data) == S_ERROR)
1698 1701 return (S_ERROR);
1699 1702
1700 1703 if ((data->d_buf = libld_malloc(shdr->sh_size)) == NULL)
1701 1704 return (S_ERROR);
1702 1705
1703 1706 cap = (Cap *)data->d_buf;
1704 1707
1705 1708 /*
1706 1709 * Fill in any object capabilities. If there is an identifier, then the
1707 1710 * identifier comes first. The remaining items follow in precedence
1708 1711 * order, although the order isn't important for runtime verification.
1709 1712 */
1710 1713 if (ocapset->oc_id.cs_str) {
1711 1714 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1712 1715 if (st_insert(strtbl, ocapset->oc_id.cs_str) == -1)
1713 1716 return (S_ERROR);
1714 1717 ocapset->oc_id.cs_ndx = capndx;
1715 1718 CAP_UPDATE(cap, capndx, CA_SUNW_ID, 0);
1716 1719 }
1717 1720 if (ocapset->oc_plat.cl_val) {
1718 1721 ofl->ofl_flags |= (FLG_OF_PTCAP | FLG_OF_CAPSTRS);
1719 1722
1720 1723 /*
1721 1724 * Insert any platform name strings in the appropriate string
1722 1725 * table. The capability value can't be filled in yet, as the
1723 1726 * final offset of the strings isn't known until later.
1724 1727 */
1725 1728 for (ALIST_TRAVERSE(ocapset->oc_plat.cl_val, idx1, capstr)) {
1726 1729 if (st_insert(strtbl, capstr->cs_str) == -1)
1727 1730 return (S_ERROR);
1728 1731 capstr->cs_ndx = capndx;
1729 1732 CAP_UPDATE(cap, capndx, CA_SUNW_PLAT, 0);
1730 1733 }
1731 1734 }
1732 1735 if (ocapset->oc_mach.cl_val) {
1733 1736 ofl->ofl_flags |= (FLG_OF_PTCAP | FLG_OF_CAPSTRS);
1734 1737
1735 1738 /*
1736 1739 * Insert the machine name strings in the appropriate string
1737 1740 * table. The capability value can't be filled in yet, as the
1738 1741 * final offset of the strings isn't known until later.
1739 1742 */
1740 1743 for (ALIST_TRAVERSE(ocapset->oc_mach.cl_val, idx1, capstr)) {
1741 1744 if (st_insert(strtbl, capstr->cs_str) == -1)
1742 1745 return (S_ERROR);
1743 1746 capstr->cs_ndx = capndx;
1744 1747 CAP_UPDATE(cap, capndx, CA_SUNW_MACH, 0);
1745 1748 }
1746 1749 }
1747 1750 if (ocapset->oc_hw_2.cm_val) {
1748 1751 ofl->ofl_flags |= FLG_OF_PTCAP;
1749 1752 CAP_UPDATE(cap, capndx, CA_SUNW_HW_2, ocapset->oc_hw_2.cm_val);
1750 1753 }
1751 1754 if (ocapset->oc_hw_1.cm_val) {
1752 1755 ofl->ofl_flags |= FLG_OF_PTCAP;
1753 1756 CAP_UPDATE(cap, capndx, CA_SUNW_HW_1, ocapset->oc_hw_1.cm_val);
1754 1757 }
1755 1758 if (ocapset->oc_sf_1.cm_val) {
1756 1759 ofl->ofl_flags |= FLG_OF_PTCAP;
1757 1760 CAP_UPDATE(cap, capndx, CA_SUNW_SF_1, ocapset->oc_sf_1.cm_val);
1758 1761 }
1759 1762 CAP_UPDATE(cap, capndx, CA_SUNW_NULL, 0);
1760 1763
1761 1764 /*
1762 1765 * Fill in any symbol capabilities.
1763 1766 */
1764 1767 if (ofl->ofl_capgroups) {
1765 1768 Cap_group *cgp;
1766 1769
1767 1770 for (APLIST_TRAVERSE(ofl->ofl_capgroups, idx1, cgp)) {
1768 1771 Objcapset *scapset = &cgp->cg_set;
1769 1772 Aliste idx2;
1770 1773 Is_desc *isp;
1771 1774
1772 1775 cgp->cg_ndx = capndx;
1773 1776
1774 1777 if (scapset->oc_id.cs_str) {
1775 1778 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1776 1779 /*
1777 1780 * Insert the identifier string in the
1778 1781 * appropriate string table. The capability
1779 1782 * value can't be filled in yet, as the final
1780 1783 * offset of the string isn't known until later.
1781 1784 */
1782 1785 if (st_insert(strtbl,
1783 1786 scapset->oc_id.cs_str) == -1)
1784 1787 return (S_ERROR);
1785 1788 scapset->oc_id.cs_ndx = capndx;
1786 1789 CAP_UPDATE(cap, capndx, CA_SUNW_ID, 0);
1787 1790 }
1788 1791
1789 1792 if (scapset->oc_plat.cl_val) {
1790 1793 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1791 1794
1792 1795 /*
1793 1796 * Insert the platform name string in the
1794 1797 * appropriate string table. The capability
1795 1798 * value can't be filled in yet, as the final
1796 1799 * offset of the string isn't known until later.
1797 1800 */
1798 1801 for (ALIST_TRAVERSE(scapset->oc_plat.cl_val,
1799 1802 idx2, capstr)) {
1800 1803 if (st_insert(strtbl,
1801 1804 capstr->cs_str) == -1)
1802 1805 return (S_ERROR);
1803 1806 capstr->cs_ndx = capndx;
1804 1807 CAP_UPDATE(cap, capndx,
1805 1808 CA_SUNW_PLAT, 0);
1806 1809 }
1807 1810 }
1808 1811 if (scapset->oc_mach.cl_val) {
1809 1812 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1810 1813
1811 1814 /*
1812 1815 * Insert the machine name string in the
1813 1816 * appropriate string table. The capability
1814 1817 * value can't be filled in yet, as the final
1815 1818 * offset of the string isn't known until later.
1816 1819 */
1817 1820 for (ALIST_TRAVERSE(scapset->oc_mach.cl_val,
1818 1821 idx2, capstr)) {
1819 1822 if (st_insert(strtbl,
1820 1823 capstr->cs_str) == -1)
1821 1824 return (S_ERROR);
1822 1825 capstr->cs_ndx = capndx;
1823 1826 CAP_UPDATE(cap, capndx,
1824 1827 CA_SUNW_MACH, 0);
1825 1828 }
1826 1829 }
1827 1830 if (scapset->oc_hw_2.cm_val) {
1828 1831 CAP_UPDATE(cap, capndx, CA_SUNW_HW_2,
1829 1832 scapset->oc_hw_2.cm_val);
1830 1833 }
1831 1834 if (scapset->oc_hw_1.cm_val) {
1832 1835 CAP_UPDATE(cap, capndx, CA_SUNW_HW_1,
1833 1836 scapset->oc_hw_1.cm_val);
1834 1837 }
1835 1838 if (scapset->oc_sf_1.cm_val) {
1836 1839 CAP_UPDATE(cap, capndx, CA_SUNW_SF_1,
1837 1840 scapset->oc_sf_1.cm_val);
1838 1841 }
1839 1842 CAP_UPDATE(cap, capndx, CA_SUNW_NULL, 0);
1840 1843
1841 1844 /*
1842 1845 * If any object capabilities are available, determine
1843 1846 * whether these symbol capabilities are less
1844 1847 * restrictive, and hence redundant.
1845 1848 */
1846 1849 if (((ofl->ofl_flags & FLG_OF_PTCAP) == 0) ||
1847 1850 (is_cap_redundant(ocapset, scapset) == 0))
1848 1851 continue;
1849 1852
1850 1853 /*
1851 1854 * Indicate any files that provide redundant symbol
1852 1855 * capabilities.
1853 1856 */
1854 1857 for (APLIST_TRAVERSE(cgp->cg_secs, idx2, isp)) {
1855 1858 ld_eprintf(ofl, ERR_WARNING,
1856 1859 MSG_INTL(MSG_CAP_REDUNDANT),
1857 1860 isp->is_file->ifl_name,
1858 1861 EC_WORD(isp->is_scnndx), isp->is_name);
1859 1862 }
1860 1863 }
1861 1864 }
1862 1865
1863 1866 /*
1864 1867 * If capabilities strings are required, the sh_info field of the
1865 1868 * section header will be set to the associated string table.
1866 1869 */
1867 1870 if (ofl->ofl_flags & FLG_OF_CAPSTRS)
1868 1871 shdr->sh_flags |= SHF_INFO_LINK;
1869 1872
1870 1873 /*
1871 1874 * Place these capabilities in the output file.
1872 1875 */
1873 1876 if ((ofl->ofl_oscap = ld_place_section(ofl, isec,
1874 1877 NULL, ident, NULL)) == (Os_desc *)S_ERROR)
1875 1878 return (S_ERROR);
1876 1879
1877 1880 /*
1878 1881 * If symbol capabilities are required, then a .SUNW_capinfo section is
1879 1882 * also created. This table will eventually be sized to match the
1880 1883 * associated symbol table.
1881 1884 */
1882 1885 if (ofl->ofl_capfamilies) {
1883 1886 if ((ofl->ofl_oscapinfo = make_sym_sec(ofl,
1884 1887 MSG_ORIG(MSG_SCN_SUNWCAPINFO), SHT_SUNW_capinfo,
1885 1888 ld_targ.t_id.id_capinfo)) == (Os_desc *)S_ERROR)
1886 1889 return (S_ERROR);
1887 1890
1888 1891 /*
1889 1892 * If we're generating a dynamic object, capabilities family
1890 1893 * members are maintained in a .SUNW_capchain section.
1891 1894 */
1892 1895 if (ofl->ofl_capchaincnt &&
1893 1896 ((ofl->ofl_flags & FLG_OF_RELOBJ) == 0)) {
1894 1897 if (new_section(ofl, SHT_SUNW_capchain,
1895 1898 MSG_ORIG(MSG_SCN_SUNWCAPCHAIN),
1896 1899 ofl->ofl_capchaincnt, &isec, &shdr,
1897 1900 &data) == S_ERROR)
1898 1901 return (S_ERROR);
1899 1902
1900 1903 ofl->ofl_oscapchain = ld_place_section(ofl, isec,
1901 1904 NULL, ld_targ.t_id.id_capchain, NULL);
1902 1905 if (ofl->ofl_oscapchain == (Os_desc *)S_ERROR)
1903 1906 return (S_ERROR);
1904 1907
1905 1908 }
1906 1909 }
1907 1910 return (1);
1908 1911 }
1909 1912 #undef CAP_UPDATE
1910 1913
1911 1914 /*
1912 1915 * Build the PLT section and its associated relocation entries.
1913 1916 */
1914 1917 static uintptr_t
1915 1918 make_plt(Ofl_desc *ofl)
1916 1919 {
1917 1920 Shdr *shdr;
1918 1921 Elf_Data *data;
1919 1922 Is_desc *isec;
1920 1923 size_t size = ld_targ.t_m.m_plt_reservsz +
1921 1924 (((size_t)ofl->ofl_pltcnt + (size_t)ofl->ofl_pltpad) *
1922 1925 ld_targ.t_m.m_plt_entsize);
1923 1926 size_t rsize = (size_t)ofl->ofl_relocpltsz;
1924 1927
1925 1928 /*
1926 1929 * On sparc, account for the NOP at the end of the plt.
1927 1930 */
1928 1931 if (ld_targ.t_m.m_mach == LD_TARG_BYCLASS(EM_SPARC, EM_SPARCV9))
1929 1932 size += sizeof (Word);
1930 1933
1931 1934 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_PLT), 0,
1932 1935 &isec, &shdr, &data) == S_ERROR)
1933 1936 return (S_ERROR);
1934 1937
1935 1938 data->d_size = size;
1936 1939 data->d_align = ld_targ.t_m.m_plt_align;
1937 1940
1938 1941 shdr->sh_flags = ld_targ.t_m.m_plt_shf_flags;
1939 1942 shdr->sh_size = (Xword)size;
1940 1943 shdr->sh_addralign = ld_targ.t_m.m_plt_align;
1941 1944 shdr->sh_entsize = ld_targ.t_m.m_plt_entsize;
1942 1945
1943 1946 ofl->ofl_osplt = ld_place_section(ofl, isec, NULL,
1944 1947 ld_targ.t_id.id_plt, NULL);
1945 1948 if (ofl->ofl_osplt == (Os_desc *)S_ERROR)
1946 1949 return (S_ERROR);
1947 1950
1948 1951 ofl->ofl_osplt->os_szoutrels = (Xword)rsize;
1949 1952
1950 1953 return (1);
1951 1954 }
1952 1955
1953 1956 /*
1954 1957 * Make the hash table. Only built for dynamic executables and shared
1955 1958 * libraries, and provides hashed lookup into the global symbol table
1956 1959 * (.dynsym) for the run-time linker to resolve symbol lookups.
1957 1960 */
1958 1961 static uintptr_t
1959 1962 make_hash(Ofl_desc *ofl)
1960 1963 {
1961 1964 Shdr *shdr;
1962 1965 Elf_Data *data;
1963 1966 Is_desc *isec;
1964 1967 size_t size;
1965 1968 Word nsyms = ofl->ofl_globcnt;
1966 1969 size_t cnt;
1967 1970
1968 1971 /*
1969 1972 * Allocate section header structures. We set entcnt to 0
1970 1973 * because it's going to change after we place this section.
1971 1974 */
1972 1975 if (new_section(ofl, SHT_HASH, MSG_ORIG(MSG_SCN_HASH), 0,
1973 1976 &isec, &shdr, &data) == S_ERROR)
1974 1977 return (S_ERROR);
1975 1978
1976 1979 /*
1977 1980 * Place the section first since it will affect the local symbol
1978 1981 * count.
1979 1982 */
1980 1983 ofl->ofl_oshash =
1981 1984 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_hash, NULL);
1982 1985 if (ofl->ofl_oshash == (Os_desc *)S_ERROR)
1983 1986 return (S_ERROR);
1984 1987
1985 1988 /*
1986 1989 * Calculate the number of output hash buckets.
1987 1990 */
1988 1991 ofl->ofl_hashbkts = findprime(nsyms);
1989 1992
1990 1993 /*
1991 1994 * The size of the hash table is determined by
1992 1995 *
1993 1996 * i. the initial nbucket and nchain entries (2)
1994 1997 * ii. the number of buckets (calculated above)
1995 1998 * iii. the number of chains (this is based on the number of
1996 1999 * symbols in the .dynsym array).
1997 2000 */
1998 2001 cnt = 2 + ofl->ofl_hashbkts + DYNSYM_ALL_CNT(ofl);
1999 2002 size = cnt * shdr->sh_entsize;
2000 2003
2001 2004 /*
2002 2005 * Finalize the section header and data buffer initialization.
2003 2006 */
2004 2007 if ((data->d_buf = libld_calloc(size, 1)) == NULL)
2005 2008 return (S_ERROR);
2006 2009 data->d_size = size;
2007 2010 shdr->sh_size = (Xword)size;
2008 2011
2009 2012 return (1);
2010 2013 }
2011 2014
2012 2015 /*
2013 2016 * Generate the standard symbol table. Contains all locals and globals,
2014 2017 * and resides in a non-allocatable section (ie. it can be stripped).
2015 2018 */
2016 2019 static uintptr_t
2017 2020 make_symtab(Ofl_desc *ofl)
2018 2021 {
2019 2022 Shdr *shdr;
2020 2023 Elf_Data *data;
2021 2024 Is_desc *isec;
2022 2025 Is_desc *xisec = 0;
2023 2026 size_t size;
2024 2027 Word symcnt;
2025 2028
2026 2029 /*
2027 2030 * Create the section headers. Note that we supply an ent_cnt
2028 2031 * of 0. We won't know the count until the section has been placed.
2029 2032 */
2030 2033 if (new_section(ofl, SHT_SYMTAB, MSG_ORIG(MSG_SCN_SYMTAB), 0,
2031 2034 &isec, &shdr, &data) == S_ERROR)
2032 2035 return (S_ERROR);
2033 2036
2034 2037 /*
2035 2038 * Place the section first since it will affect the local symbol
2036 2039 * count.
2037 2040 */
2038 2041 if ((ofl->ofl_ossymtab = ld_place_section(ofl, isec, NULL,
2039 2042 ld_targ.t_id.id_symtab, NULL)) == (Os_desc *)S_ERROR)
2040 2043 return (S_ERROR);
2041 2044
2042 2045 /*
2043 2046 * At this point we've created all but the 'shstrtab' section.
2044 2047 * Determine if we have to use 'Extended Sections'. If so - then
2045 2048 * also create a SHT_SYMTAB_SHNDX section.
2046 2049 */
2047 2050 if ((ofl->ofl_shdrcnt + 1) >= SHN_LORESERVE) {
2048 2051 Shdr *xshdr;
2049 2052 Elf_Data *xdata;
2050 2053
2051 2054 if (new_section(ofl, SHT_SYMTAB_SHNDX,
2052 2055 MSG_ORIG(MSG_SCN_SYMTAB_SHNDX), 0, &xisec,
2053 2056 &xshdr, &xdata) == S_ERROR)
2054 2057 return (S_ERROR);
2055 2058
2056 2059 if ((ofl->ofl_ossymshndx = ld_place_section(ofl, xisec, NULL,
2057 2060 ld_targ.t_id.id_symtab_ndx, NULL)) == (Os_desc *)S_ERROR)
2058 2061 return (S_ERROR);
2059 2062 }
2060 2063
2061 2064 /*
2062 2065 * Calculated number of symbols, which need to be augmented by
2063 2066 * the (yet to be created) .shstrtab entry.
2064 2067 */
2065 2068 symcnt = (size_t)(1 + SYMTAB_ALL_CNT(ofl));
2066 2069 size = symcnt * shdr->sh_entsize;
2067 2070
2068 2071 /*
2069 2072 * Finalize the section header and data buffer initialization.
2070 2073 */
2071 2074 data->d_size = size;
2072 2075 shdr->sh_size = (Xword)size;
2073 2076
2074 2077 /*
2075 2078 * If we created a SHT_SYMTAB_SHNDX - then set it's sizes too.
2076 2079 */
2077 2080 if (xisec) {
2078 2081 size_t xsize = symcnt * sizeof (Word);
2079 2082
2080 2083 xisec->is_indata->d_size = xsize;
2081 2084 xisec->is_shdr->sh_size = (Xword)xsize;
2082 2085 }
2083 2086
2084 2087 return (1);
2085 2088 }
2086 2089
2087 2090 /*
2088 2091 * Build a dynamic symbol table. These tables reside in the text
2089 2092 * segment of a dynamic executable or shared library.
2090 2093 *
2091 2094 * .SUNW_ldynsym contains local function symbols
2092 2095 * .dynsym contains only globals symbols
2093 2096 *
2094 2097 * The two tables are created adjacent to each other, with .SUNW_ldynsym
2095 2098 * coming first.
2096 2099 */
2097 2100 static uintptr_t
2098 2101 make_dynsym(Ofl_desc *ofl)
2099 2102 {
2100 2103 Shdr *shdr, *lshdr;
2101 2104 Elf_Data *data, *ldata;
2102 2105 Is_desc *isec, *lisec;
2103 2106 size_t size;
2104 2107 Xword cnt;
2105 2108 int allow_ldynsym;
2106 2109
2107 2110 /*
2108 2111 * Unless explicitly disabled, always produce a .SUNW_ldynsym section
2109 2112 * when it is allowed by the file type, even if the resulting
2110 2113 * table only ends up with a single STT_FILE in it. There are
2111 2114 * two reasons: (1) It causes the generation of the DT_SUNW_SYMTAB
2112 2115 * entry in the .dynamic section, which is something we would
2113 2116 * like to encourage, and (2) Without it, we cannot generate
2114 2117 * the associated .SUNW_dyn[sym|tls]sort sections, which are of
2115 2118 * value to DTrace.
2116 2119 *
2117 2120 * In practice, it is extremely rare for an object not to have
2118 2121 * local symbols for .SUNW_ldynsym, so 99% of the time, we'd be
2119 2122 * doing it anyway.
2120 2123 */
2121 2124 allow_ldynsym = OFL_ALLOW_LDYNSYM(ofl);
2122 2125
2123 2126 /*
2124 2127 * Create the section headers. Note that we supply an ent_cnt
2125 2128 * of 0. We won't know the count until the section has been placed.
2126 2129 */
2127 2130 if (allow_ldynsym && new_section(ofl, SHT_SUNW_LDYNSYM,
2128 2131 MSG_ORIG(MSG_SCN_LDYNSYM), 0, &lisec, &lshdr, &ldata) == S_ERROR)
2129 2132 return (S_ERROR);
2130 2133
2131 2134 if (new_section(ofl, SHT_DYNSYM, MSG_ORIG(MSG_SCN_DYNSYM), 0,
2132 2135 &isec, &shdr, &data) == S_ERROR)
2133 2136 return (S_ERROR);
2134 2137
2135 2138 /*
2136 2139 * Place the section(s) first since it will affect the local symbol
2137 2140 * count.
2138 2141 */
2139 2142 if (allow_ldynsym &&
2140 2143 ((ofl->ofl_osldynsym = ld_place_section(ofl, lisec, NULL,
2141 2144 ld_targ.t_id.id_ldynsym, NULL)) == (Os_desc *)S_ERROR))
2142 2145 return (S_ERROR);
2143 2146 ofl->ofl_osdynsym =
2144 2147 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_dynsym, NULL);
2145 2148 if (ofl->ofl_osdynsym == (Os_desc *)S_ERROR)
2146 2149 return (S_ERROR);
2147 2150
2148 2151 cnt = DYNSYM_ALL_CNT(ofl);
2149 2152 size = (size_t)cnt * shdr->sh_entsize;
2150 2153
2151 2154 /*
2152 2155 * Finalize the section header and data buffer initialization.
2153 2156 */
2154 2157 data->d_size = size;
2155 2158 shdr->sh_size = (Xword)size;
2156 2159
2157 2160 /*
2158 2161 * An ldynsym contains local function symbols. It is not
2159 2162 * used for linking, but if present, serves to allow better
2160 2163 * stack traces to be generated in contexts where the symtab
2161 2164 * is not available. (dladdr(), or stripped executable/library files).
2162 2165 */
2163 2166 if (allow_ldynsym) {
2164 2167 cnt = 1 + ofl->ofl_dynlocscnt + ofl->ofl_dynscopecnt;
2165 2168 size = (size_t)cnt * shdr->sh_entsize;
2166 2169
2167 2170 ldata->d_size = size;
2168 2171 lshdr->sh_size = (Xword)size;
2169 2172 }
2170 2173
2171 2174 return (1);
2172 2175 }
2173 2176
2174 2177 /*
2175 2178 * Build .SUNW_dynsymsort and/or .SUNW_dyntlssort sections. These are
2176 2179 * index sections for the .SUNW_ldynsym/.dynsym pair that present data
2177 2180 * and function symbols sorted by address.
2178 2181 */
2179 2182 static uintptr_t
2180 2183 make_dynsort(Ofl_desc *ofl)
2181 2184 {
2182 2185 Shdr *shdr;
2183 2186 Elf_Data *data;
2184 2187 Is_desc *isec;
2185 2188
2186 2189 /* Only do it if the .SUNW_ldynsym section is present */
2187 2190 if (!OFL_ALLOW_LDYNSYM(ofl))
2188 2191 return (1);
2189 2192
2190 2193 /* .SUNW_dynsymsort */
2191 2194 if (ofl->ofl_dynsymsortcnt > 0) {
2192 2195 if (new_section(ofl, SHT_SUNW_symsort,
2193 2196 MSG_ORIG(MSG_SCN_DYNSYMSORT), ofl->ofl_dynsymsortcnt,
2194 2197 &isec, &shdr, &data) == S_ERROR)
2195 2198 return (S_ERROR);
2196 2199
2197 2200 if ((ofl->ofl_osdynsymsort = ld_place_section(ofl, isec, NULL,
2198 2201 ld_targ.t_id.id_dynsort, NULL)) == (Os_desc *)S_ERROR)
2199 2202 return (S_ERROR);
2200 2203 }
2201 2204
2202 2205 /* .SUNW_dyntlssort */
2203 2206 if (ofl->ofl_dyntlssortcnt > 0) {
2204 2207 if (new_section(ofl, SHT_SUNW_tlssort,
2205 2208 MSG_ORIG(MSG_SCN_DYNTLSSORT),
2206 2209 ofl->ofl_dyntlssortcnt, &isec, &shdr, &data) == S_ERROR)
2207 2210 return (S_ERROR);
2208 2211
2209 2212 if ((ofl->ofl_osdyntlssort = ld_place_section(ofl, isec, NULL,
2210 2213 ld_targ.t_id.id_dynsort, NULL)) == (Os_desc *)S_ERROR)
2211 2214 return (S_ERROR);
2212 2215 }
2213 2216
2214 2217 return (1);
2215 2218 }
2216 2219
2217 2220 /*
2218 2221 * Helper routine for make_dynsym_shndx. Builds a
2219 2222 * a SHT_SYMTAB_SHNDX for .dynsym or .SUNW_ldynsym, without knowing
2220 2223 * which one it is.
2221 2224 */
2222 2225 static uintptr_t
2223 2226 make_dyn_shndx(Ofl_desc *ofl, const char *shname, Os_desc *symtab,
2224 2227 Os_desc **ret_os)
2225 2228 {
2226 2229 Is_desc *isec;
2227 2230 Is_desc *dynsymisp;
2228 2231 Shdr *shdr, *dynshdr;
2229 2232 Elf_Data *data;
2230 2233
2231 2234 dynsymisp = ld_os_first_isdesc(symtab);
2232 2235 dynshdr = dynsymisp->is_shdr;
2233 2236
2234 2237 if (new_section(ofl, SHT_SYMTAB_SHNDX, shname,
2235 2238 (dynshdr->sh_size / dynshdr->sh_entsize),
2236 2239 &isec, &shdr, &data) == S_ERROR)
2237 2240 return (S_ERROR);
2238 2241
2239 2242 if ((*ret_os = ld_place_section(ofl, isec, NULL,
2240 2243 ld_targ.t_id.id_dynsym_ndx, NULL)) == (Os_desc *)S_ERROR)
2241 2244 return (S_ERROR);
2242 2245
2243 2246 assert(*ret_os);
2244 2247
2245 2248 return (1);
2246 2249 }
2247 2250
2248 2251 /*
2249 2252 * Build a SHT_SYMTAB_SHNDX for the .dynsym, and .SUNW_ldynsym
2250 2253 */
2251 2254 static uintptr_t
2252 2255 make_dynsym_shndx(Ofl_desc *ofl)
2253 2256 {
2254 2257 /*
2255 2258 * If there is a .SUNW_ldynsym, generate a section for its extended
2256 2259 * index section as well.
2257 2260 */
2258 2261 if (OFL_ALLOW_LDYNSYM(ofl)) {
2259 2262 if (make_dyn_shndx(ofl, MSG_ORIG(MSG_SCN_LDYNSYM_SHNDX),
2260 2263 ofl->ofl_osldynsym, &ofl->ofl_osldynshndx) == S_ERROR)
2261 2264 return (S_ERROR);
2262 2265 }
2263 2266
2264 2267 /* The Generate a section for the dynsym */
2265 2268 if (make_dyn_shndx(ofl, MSG_ORIG(MSG_SCN_DYNSYM_SHNDX),
2266 2269 ofl->ofl_osdynsym, &ofl->ofl_osdynshndx) == S_ERROR)
2267 2270 return (S_ERROR);
2268 2271
2269 2272 return (1);
2270 2273 }
2271 2274
2272 2275
2273 2276 /*
2274 2277 * Build a string table for the section headers.
2275 2278 */
2276 2279 static uintptr_t
2277 2280 make_shstrtab(Ofl_desc *ofl)
2278 2281 {
2279 2282 Shdr *shdr;
2280 2283 Elf_Data *data;
2281 2284 Is_desc *isec;
2282 2285 size_t size;
2283 2286
2284 2287 if (new_section(ofl, SHT_STRTAB, MSG_ORIG(MSG_SCN_SHSTRTAB),
2285 2288 0, &isec, &shdr, &data) == S_ERROR)
2286 2289 return (S_ERROR);
2287 2290
2288 2291 /*
2289 2292 * Place the section first, as it may effect the number of section
2290 2293 * headers to account for.
2291 2294 */
2292 2295 ofl->ofl_osshstrtab =
2293 2296 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_note, NULL);
2294 2297 if (ofl->ofl_osshstrtab == (Os_desc *)S_ERROR)
2295 2298 return (S_ERROR);
2296 2299
2297 2300 size = st_getstrtab_sz(ofl->ofl_shdrsttab);
2298 2301 assert(size > 0);
2299 2302
2300 2303 data->d_size = size;
2301 2304 shdr->sh_size = (Xword)size;
2302 2305
2303 2306 return (1);
2304 2307 }
2305 2308
2306 2309 /*
2307 2310 * Build a string section for the standard symbol table.
2308 2311 */
2309 2312 static uintptr_t
2310 2313 make_strtab(Ofl_desc *ofl)
2311 2314 {
2312 2315 Shdr *shdr;
2313 2316 Elf_Data *data;
2314 2317 Is_desc *isec;
2315 2318 size_t size;
2316 2319
2317 2320 /*
2318 2321 * This string table consists of all the global and local symbols.
2319 2322 * Account for null bytes at end of the file name and the beginning
2320 2323 * of section.
2321 2324 */
2322 2325 if (st_insert(ofl->ofl_strtab, ofl->ofl_name) == -1)
2323 2326 return (S_ERROR);
2324 2327
2325 2328 size = st_getstrtab_sz(ofl->ofl_strtab);
2326 2329 assert(size > 0);
2327 2330
2328 2331 if (new_section(ofl, SHT_STRTAB, MSG_ORIG(MSG_SCN_STRTAB),
2329 2332 0, &isec, &shdr, &data) == S_ERROR)
2330 2333 return (S_ERROR);
2331 2334
2332 2335 /* Set the size of the data area */
2333 2336 data->d_size = size;
2334 2337 shdr->sh_size = (Xword)size;
2335 2338
2336 2339 ofl->ofl_osstrtab =
2337 2340 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_strtab, NULL);
2338 2341 return ((uintptr_t)ofl->ofl_osstrtab);
2339 2342 }
2340 2343
2341 2344 /*
2342 2345 * Build a string table for the dynamic symbol table.
2343 2346 */
2344 2347 static uintptr_t
2345 2348 make_dynstr(Ofl_desc *ofl)
2346 2349 {
2347 2350 Shdr *shdr;
2348 2351 Elf_Data *data;
2349 2352 Is_desc *isec;
2350 2353 size_t size;
2351 2354
2352 2355 /*
2353 2356 * If producing a .SUNW_ldynsym, account for the initial STT_FILE
2354 2357 * symbol that precedes the scope reduced global symbols.
2355 2358 */
2356 2359 if (OFL_ALLOW_LDYNSYM(ofl)) {
2357 2360 if (st_insert(ofl->ofl_dynstrtab, ofl->ofl_name) == -1)
2358 2361 return (S_ERROR);
2359 2362 ofl->ofl_dynscopecnt++;
2360 2363 }
2361 2364
2362 2365 /*
2363 2366 * Account for any local, named register symbols. These locals are
2364 2367 * required for reference from DT_REGISTER .dynamic entries.
2365 2368 */
2366 2369 if (ofl->ofl_regsyms) {
2367 2370 int ndx;
2368 2371
2369 2372 for (ndx = 0; ndx < ofl->ofl_regsymsno; ndx++) {
2370 2373 Sym_desc *sdp;
2371 2374
2372 2375 if ((sdp = ofl->ofl_regsyms[ndx]) == NULL)
2373 2376 continue;
2374 2377
2375 2378 if (!SYM_IS_HIDDEN(sdp) &&
2376 2379 (ELF_ST_BIND(sdp->sd_sym->st_info) != STB_LOCAL))
2377 2380 continue;
2378 2381
2379 2382 if (sdp->sd_sym->st_name == NULL)
2380 2383 continue;
2381 2384
2382 2385 if (st_insert(ofl->ofl_dynstrtab, sdp->sd_name) == -1)
2383 2386 return (S_ERROR);
2384 2387 }
2385 2388 }
2386 2389
2387 2390 /*
2388 2391 * Reserve entries for any per-symbol auxiliary/filter strings.
2389 2392 */
2390 2393 if (ofl->ofl_dtsfltrs != NULL) {
2391 2394 Dfltr_desc *dftp;
2392 2395 Aliste idx;
2393 2396
2394 2397 for (ALIST_TRAVERSE(ofl->ofl_dtsfltrs, idx, dftp))
2395 2398 if (st_insert(ofl->ofl_dynstrtab, dftp->dft_str) == -1)
2396 2399 return (S_ERROR);
2397 2400 }
2398 2401
2399 2402 size = st_getstrtab_sz(ofl->ofl_dynstrtab);
2400 2403 assert(size > 0);
2401 2404
2402 2405 if (new_section(ofl, SHT_STRTAB, MSG_ORIG(MSG_SCN_DYNSTR),
2403 2406 0, &isec, &shdr, &data) == S_ERROR)
2404 2407 return (S_ERROR);
2405 2408
2406 2409 /* Make it allocable if necessary */
2407 2410 if (!(ofl->ofl_flags & FLG_OF_RELOBJ))
2408 2411 shdr->sh_flags |= SHF_ALLOC;
2409 2412
2410 2413 /* Set the size of the data area */
2411 2414 data->d_size = size + DYNSTR_EXTRA_PAD;
2412 2415
2413 2416 shdr->sh_size = (Xword)size;
2414 2417
2415 2418 ofl->ofl_osdynstr =
2416 2419 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_dynstr, NULL);
2417 2420 return ((uintptr_t)ofl->ofl_osdynstr);
2418 2421 }
2419 2422
2420 2423 /*
2421 2424 * Generate an output relocation section which will contain the relocation
2422 2425 * information to be applied to the `osp' section.
2423 2426 *
2424 2427 * If (osp == NULL) then we are creating the coalesced relocation section
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2425 2428 * for an executable and/or a shared object.
2426 2429 */
2427 2430 static uintptr_t
2428 2431 make_reloc(Ofl_desc *ofl, Os_desc *osp)
2429 2432 {
2430 2433 Shdr *shdr;
2431 2434 Elf_Data *data;
2432 2435 Is_desc *isec;
2433 2436 size_t size;
2434 2437 Xword sh_flags;
2435 - char *sectname;
2438 + char *sectname;
2436 2439 Os_desc *rosp;
2437 2440 Word relsize;
2438 2441 const char *rel_prefix;
2439 2442
2440 2443 /* LINTED */
2441 2444 if (ld_targ.t_m.m_rel_sht_type == SHT_REL) {
2442 2445 /* REL */
2443 2446 relsize = sizeof (Rel);
2444 2447 rel_prefix = MSG_ORIG(MSG_SCN_REL);
2445 2448 } else {
2446 2449 /* RELA */
2447 2450 relsize = sizeof (Rela);
2448 2451 rel_prefix = MSG_ORIG(MSG_SCN_RELA);
2449 2452 }
2450 2453
2451 2454 if (osp) {
2452 2455 size = osp->os_szoutrels;
2453 2456 sh_flags = osp->os_shdr->sh_flags;
2454 2457 if ((sectname = libld_malloc(strlen(rel_prefix) +
2455 2458 strlen(osp->os_name) + 1)) == 0)
2456 2459 return (S_ERROR);
2457 2460 (void) strcpy(sectname, rel_prefix);
2458 2461 (void) strcat(sectname, osp->os_name);
2459 2462 } else if (ofl->ofl_flags & FLG_OF_COMREL) {
2460 2463 size = (ofl->ofl_reloccnt - ofl->ofl_reloccntsub) * relsize;
2461 2464 sh_flags = SHF_ALLOC;
2462 2465 sectname = (char *)MSG_ORIG(MSG_SCN_SUNWRELOC);
2463 2466 } else {
2464 2467 size = ofl->ofl_relocrelsz;
2465 2468 sh_flags = SHF_ALLOC;
2466 2469 sectname = (char *)rel_prefix;
2467 2470 }
2468 2471
2469 2472 /*
2470 2473 * Keep track of total size of 'output relocations' (to be stored
2471 2474 * in .dynamic)
2472 2475 */
2473 2476 /* LINTED */
2474 2477 ofl->ofl_relocsz += (Xword)size;
2475 2478
2476 2479 if (new_section(ofl, ld_targ.t_m.m_rel_sht_type, sectname, 0, &isec,
2477 2480 &shdr, &data) == S_ERROR)
2478 2481 return (S_ERROR);
2479 2482
2480 2483 data->d_size = size;
2481 2484
2482 2485 shdr->sh_size = (Xword)size;
2483 2486 if (OFL_ALLOW_DYNSYM(ofl) && (sh_flags & SHF_ALLOC))
2484 2487 shdr->sh_flags = SHF_ALLOC;
2485 2488
2486 2489 if (osp) {
2487 2490 /*
2488 2491 * The sh_info field of the SHT_REL* sections points to the
2489 2492 * section the relocations are to be applied to.
2490 2493 */
2491 2494 shdr->sh_flags |= SHF_INFO_LINK;
2492 2495 }
2493 2496
2494 2497 rosp = ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_rel, NULL);
2495 2498 if (rosp == (Os_desc *)S_ERROR)
2496 2499 return (S_ERROR);
2497 2500
2498 2501 /*
2499 2502 * Associate this relocation section to the section its going to
2500 2503 * relocate.
2501 2504 */
2502 2505 if (osp) {
2503 2506 Aliste idx;
2504 2507 Is_desc *risp;
2505 2508
2506 2509 /*
2507 2510 * This is used primarily so that we can update
2508 2511 * SHT_GROUP[sect_no] entries to point to the
2509 2512 * created output relocation sections.
2510 2513 */
2511 2514 for (APLIST_TRAVERSE(osp->os_relisdescs, idx, risp)) {
2512 2515 risp->is_osdesc = rosp;
2513 2516
2514 2517 /*
2515 2518 * If the input relocation section had the SHF_GROUP
2516 2519 * flag set - propagate it to the output relocation
2517 2520 * section.
2518 2521 */
2519 2522 if (risp->is_shdr->sh_flags & SHF_GROUP) {
2520 2523 rosp->os_shdr->sh_flags |= SHF_GROUP;
2521 2524 break;
2522 2525 }
2523 2526 }
2524 2527 osp->os_relosdesc = rosp;
2525 2528 } else
2526 2529 ofl->ofl_osrel = rosp;
2527 2530
2528 2531 /*
2529 2532 * If this is the first relocation section we've encountered save it
2530 2533 * so that the .dynamic entry can be initialized accordingly.
2531 2534 */
2532 2535 if (ofl->ofl_osrelhead == (Os_desc *)0)
2533 2536 ofl->ofl_osrelhead = rosp;
2534 2537
2535 2538 return (1);
2536 2539 }
2537 2540
2538 2541 /*
2539 2542 * Generate version needed section.
2540 2543 */
2541 2544 static uintptr_t
2542 2545 make_verneed(Ofl_desc *ofl)
2543 2546 {
2544 2547 Shdr *shdr;
2545 2548 Elf_Data *data;
2546 2549 Is_desc *isec;
2547 2550
2548 2551 /*
2549 2552 * verneed sections do not have a constant element size, so the
2550 2553 * value of ent_cnt specified here (0) is meaningless.
2551 2554 */
2552 2555 if (new_section(ofl, SHT_SUNW_verneed, MSG_ORIG(MSG_SCN_SUNWVERSION),
2553 2556 0, &isec, &shdr, &data) == S_ERROR)
2554 2557 return (S_ERROR);
2555 2558
2556 2559 /* During version processing we calculated the total size. */
2557 2560 data->d_size = ofl->ofl_verneedsz;
2558 2561 shdr->sh_size = (Xword)ofl->ofl_verneedsz;
2559 2562
2560 2563 ofl->ofl_osverneed =
2561 2564 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_version, NULL);
2562 2565 return ((uintptr_t)ofl->ofl_osverneed);
2563 2566 }
2564 2567
2565 2568 /*
2566 2569 * Generate a version definition section.
2567 2570 *
2568 2571 * o the SHT_SUNW_verdef section defines the versions that exist within this
2569 2572 * image.
2570 2573 */
2571 2574 static uintptr_t
2572 2575 make_verdef(Ofl_desc *ofl)
2573 2576 {
2574 2577 Shdr *shdr;
2575 2578 Elf_Data *data;
2576 2579 Is_desc *isec;
2577 2580 Ver_desc *vdp;
2578 2581 Str_tbl *strtab;
2579 2582
2580 2583 /*
2581 2584 * Reserve a string table entry for the base version dependency (other
2582 2585 * dependencies have symbol representations, which will already be
2583 2586 * accounted for during symbol processing).
2584 2587 */
2585 2588 vdp = (Ver_desc *)ofl->ofl_verdesc->apl_data[0];
2586 2589
2587 2590 if (OFL_IS_STATIC_OBJ(ofl))
2588 2591 strtab = ofl->ofl_strtab;
2589 2592 else
2590 2593 strtab = ofl->ofl_dynstrtab;
2591 2594
2592 2595 if (st_insert(strtab, vdp->vd_name) == -1)
2593 2596 return (S_ERROR);
2594 2597
2595 2598 /*
2596 2599 * verdef sections do not have a constant element size, so the
2597 2600 * value of ent_cnt specified here (0) is meaningless.
2598 2601 */
2599 2602 if (new_section(ofl, SHT_SUNW_verdef, MSG_ORIG(MSG_SCN_SUNWVERSION),
2600 2603 0, &isec, &shdr, &data) == S_ERROR)
2601 2604 return (S_ERROR);
2602 2605
2603 2606 /* During version processing we calculated the total size. */
2604 2607 data->d_size = ofl->ofl_verdefsz;
2605 2608 shdr->sh_size = (Xword)ofl->ofl_verdefsz;
2606 2609
2607 2610 ofl->ofl_osverdef =
2608 2611 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_version, NULL);
2609 2612 return ((uintptr_t)ofl->ofl_osverdef);
2610 2613 }
2611 2614
2612 2615 /*
2613 2616 * This routine is called when -z nopartial is in effect.
2614 2617 */
2615 2618 uintptr_t
2616 2619 ld_make_parexpn_data(Ofl_desc *ofl, size_t size, Xword align)
2617 2620 {
2618 2621 Shdr *shdr;
2619 2622 Elf_Data *data;
2620 2623 Is_desc *isec;
2621 2624 Os_desc *osp;
2622 2625
2623 2626 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_DATA), 0,
2624 2627 &isec, &shdr, &data) == S_ERROR)
2625 2628 return (S_ERROR);
2626 2629
2627 2630 shdr->sh_flags |= SHF_WRITE;
2628 2631 data->d_size = size;
2629 2632 shdr->sh_size = (Xword)size;
2630 2633 if (align != 0) {
2631 2634 data->d_align = align;
2632 2635 shdr->sh_addralign = align;
2633 2636 }
2634 2637
2635 2638 if ((data->d_buf = libld_calloc(size, 1)) == NULL)
2636 2639 return (S_ERROR);
2637 2640
2638 2641 /*
2639 2642 * Retain handle to this .data input section. Variables using move
2640 2643 * sections (partial initialization) will be redirected here when
2641 2644 * such global references are added and '-z nopartial' is in effect.
2642 2645 */
2643 2646 ofl->ofl_isparexpn = isec;
2644 2647 osp = ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_data, NULL);
2645 2648 if (osp == (Os_desc *)S_ERROR)
2646 2649 return (S_ERROR);
2647 2650
2648 2651 if (!(osp->os_flags & FLG_OS_OUTREL)) {
2649 2652 ofl->ofl_dynshdrcnt++;
2650 2653 osp->os_flags |= FLG_OS_OUTREL;
2651 2654 }
2652 2655 return (1);
2653 2656 }
2654 2657
2655 2658 /*
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2656 2659 * Make .sunwmove section
2657 2660 */
2658 2661 uintptr_t
2659 2662 ld_make_sunwmove(Ofl_desc *ofl, int mv_nums)
2660 2663 {
2661 2664 Shdr *shdr;
2662 2665 Elf_Data *data;
2663 2666 Is_desc *isec;
2664 2667 Aliste idx;
2665 2668 Sym_desc *sdp;
2666 - int cnt = 1;
2669 + int cnt = 1;
2667 2670
2668 2671
2669 2672 if (new_section(ofl, SHT_SUNW_move, MSG_ORIG(MSG_SCN_SUNWMOVE),
2670 2673 mv_nums, &isec, &shdr, &data) == S_ERROR)
2671 2674 return (S_ERROR);
2672 2675
2673 2676 if ((data->d_buf = libld_calloc(data->d_size, 1)) == NULL)
2674 2677 return (S_ERROR);
2675 2678
2676 2679 /*
2677 2680 * Copy move entries
2678 2681 */
2679 2682 for (APLIST_TRAVERSE(ofl->ofl_parsyms, idx, sdp)) {
2680 2683 Aliste idx2;
2681 2684 Mv_desc *mdp;
2682 2685
2683 2686 if (sdp->sd_flags & FLG_SY_PAREXPN)
2684 2687 continue;
2685 2688
2686 2689 for (ALIST_TRAVERSE(sdp->sd_move, idx2, mdp))
2687 2690 mdp->md_oidx = cnt++;
2688 2691 }
2689 2692
2690 2693 if ((ofl->ofl_osmove = ld_place_section(ofl, isec, NULL, 0, NULL)) ==
2691 2694 (Os_desc *)S_ERROR)
2692 2695 return (S_ERROR);
2693 2696
2694 2697 return (1);
2695 2698 }
2696 2699
2697 2700 /*
2698 2701 * Given a relocation descriptor that references a string table
2699 2702 * input section, locate the string referenced and return a pointer
2700 2703 * to it.
2701 2704 */
2702 2705 static const char *
2703 2706 strmerge_get_reloc_str(Ofl_desc *ofl, Rel_desc *rsp)
2704 2707 {
2705 2708 Sym_desc *sdp = rsp->rel_sym;
2706 2709 Xword str_off;
2707 2710
2708 2711 /*
2709 2712 * In the case of an STT_SECTION symbol, the addend of the
2710 2713 * relocation gives the offset into the string section. For
2711 2714 * other symbol types, the symbol value is the offset.
2712 2715 */
2713 2716
2714 2717 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_SECTION) {
2715 2718 str_off = sdp->sd_sym->st_value;
2716 2719 } else if ((rsp->rel_flags & FLG_REL_RELA) == FLG_REL_RELA) {
2717 2720 /*
2718 2721 * For SHT_RELA, the addend value is found in the
2719 2722 * rel_raddend field of the relocation.
2720 2723 */
2721 2724 str_off = rsp->rel_raddend;
2722 2725 } else { /* REL and STT_SECTION */
2723 2726 /*
2724 2727 * For SHT_REL, the "addend" is not part of the relocation
2725 2728 * record. Instead, it is found at the relocation target
2726 2729 * address.
2727 2730 */
2728 2731 uchar_t *addr = (uchar_t *)((uintptr_t)rsp->rel_roffset +
2729 2732 (uintptr_t)rsp->rel_isdesc->is_indata->d_buf);
2730 2733
2731 2734 if (ld_reloc_targval_get(ofl, rsp, addr, &str_off) == 0)
2732 2735 return (0);
2733 2736 }
2734 2737
2735 2738 return (str_off + (char *)sdp->sd_isc->is_indata->d_buf);
2736 2739 }
2737 2740
2738 2741 /*
2739 2742 * First pass over the relocation records for string table merging.
2740 2743 * Build lists of relocations and symbols that will need modification,
2741 2744 * and insert the strings they reference into the mstrtab string table.
2742 2745 *
2743 2746 * entry:
2744 2747 * ofl, osp - As passed to ld_make_strmerge().
2745 2748 * mstrtab - String table to receive input strings. This table
2746 2749 * must be in its first (initialization) pass and not
2747 2750 * yet cooked (st_getstrtab_sz() not yet called).
2748 2751 * rel_alpp - APlist to receive pointer to any relocation
2749 2752 * descriptors with STT_SECTION symbols that reference
2750 2753 * one of the input sections being merged.
2751 2754 * sym_alpp - APlist to receive pointer to any symbols that reference
2752 2755 * one of the input sections being merged.
2753 2756 * rcp - Pointer to cache of relocation descriptors to examine.
2754 2757 * Either &ofl->ofl_actrels (active relocations)
2755 2758 * or &ofl->ofl_outrels (output relocations).
2756 2759 *
2757 2760 * exit:
2758 2761 * On success, rel_alpp and sym_alpp are updated, and
2759 2762 * any strings in the mergeable input sections referenced by
2760 2763 * a relocation has been entered into mstrtab. True (1) is returned.
2761 2764 *
2762 2765 * On failure, False (0) is returned.
2763 2766 */
2764 2767 static int
2765 2768 strmerge_pass1(Ofl_desc *ofl, Os_desc *osp, Str_tbl *mstrtab,
2766 2769 APlist **rel_alpp, APlist **sym_alpp, Rel_cache *rcp)
2767 2770 {
2768 2771 Aliste idx;
2769 2772 Rel_cachebuf *rcbp;
2770 2773 Sym_desc *sdp;
2771 2774 Sym_desc *last_sdp = NULL;
2772 2775 Rel_desc *rsp;
2773 2776 const char *name;
2774 2777
2775 2778 REL_CACHE_TRAVERSE(rcp, idx, rcbp, rsp) {
2776 2779 sdp = rsp->rel_sym;
2777 2780 if ((sdp->sd_isc == NULL) || ((sdp->sd_isc->is_flags &
2778 2781 (FLG_IS_DISCARD | FLG_IS_INSTRMRG)) != FLG_IS_INSTRMRG) ||
2779 2782 (sdp->sd_isc->is_osdesc != osp))
2780 2783 continue;
2781 2784
2782 2785 /*
2783 2786 * Remember symbol for use in the third pass. There is no
2784 2787 * reason to save a given symbol more than once, so we take
2785 2788 * advantage of the fact that relocations to a given symbol
2786 2789 * tend to cluster in the list. If this is the same symbol
2787 2790 * we saved last time, don't bother.
2788 2791 */
2789 2792 if (last_sdp != sdp) {
2790 2793 if (aplist_append(sym_alpp, sdp, AL_CNT_STRMRGSYM) ==
2791 2794 NULL)
2792 2795 return (0);
2793 2796 last_sdp = sdp;
2794 2797 }
2795 2798
2796 2799 /* Enter the string into our new string table */
2797 2800 name = strmerge_get_reloc_str(ofl, rsp);
2798 2801 if (st_insert(mstrtab, name) == -1)
2799 2802 return (0);
2800 2803
2801 2804 /*
2802 2805 * If this is an STT_SECTION symbol, then the second pass
2803 2806 * will need to modify this relocation, so hang on to it.
2804 2807 */
2805 2808 if ((ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) &&
2806 2809 (aplist_append(rel_alpp, rsp, AL_CNT_STRMRGREL) == NULL))
2807 2810 return (0);
2808 2811 }
2809 2812
2810 2813 return (1);
2811 2814 }
2812 2815
2813 2816 /*
2814 2817 * If the output section has any SHF_MERGE|SHF_STRINGS input sections,
2815 2818 * replace them with a single merged/compressed input section.
2816 2819 *
2817 2820 * entry:
2818 2821 * ofl - Output file descriptor
2819 2822 * osp - Output section descriptor
2820 2823 * rel_alpp, sym_alpp, - Address of 2 APlists, to be used
2821 2824 * for internal processing. On the initial call to
2822 2825 * ld_make_strmerge, these list pointers must be NULL.
2823 2826 * The caller is encouraged to pass the same lists back for
2824 2827 * successive calls to this function without freeing
2825 2828 * them in between calls. This causes a single pair of
2826 2829 * memory allocations to be reused multiple times.
2827 2830 *
2828 2831 * exit:
2829 2832 * If section merging is possible, it is done. If no errors are
2830 2833 * encountered, True (1) is returned. On error, S_ERROR.
2831 2834 *
2832 2835 * The contents of rel_alpp and sym_alpp on exit are
2833 2836 * undefined. The caller can free them, or pass them back to a subsequent
2834 2837 * call to this routine, but should not examine their contents.
2835 2838 */
2836 2839 static uintptr_t
2837 2840 ld_make_strmerge(Ofl_desc *ofl, Os_desc *osp, APlist **rel_alpp,
2838 2841 APlist **sym_alpp)
2839 2842 {
2840 2843 Str_tbl *mstrtab; /* string table for string merge secs */
2841 2844 Is_desc *mstrsec; /* Generated string merge section */
2842 2845 Is_desc *isp;
2843 2846 Shdr *mstr_shdr;
2844 2847 Elf_Data *mstr_data;
2845 2848 Sym_desc *sdp;
2846 2849 Rel_desc *rsp;
2847 2850 Aliste idx;
2848 2851 size_t data_size;
2849 2852 int st_setstring_status;
2850 2853 size_t stoff;
2851 2854
2852 2855 /* If string table compression is disabled, there's nothing to do */
2853 2856 if ((ofl->ofl_flags1 & FLG_OF1_NCSTTAB) != 0)
2854 2857 return (1);
2855 2858
2856 2859 /*
2857 2860 * Pass over the mergeable input sections, and if they haven't
2858 2861 * all been discarded, create a string table.
2859 2862 */
2860 2863 mstrtab = NULL;
2861 2864 for (APLIST_TRAVERSE(osp->os_mstrisdescs, idx, isp)) {
2862 2865 if (isdesc_discarded(isp))
2863 2866 continue;
2864 2867
2865 2868 /*
2866 2869 * Input sections of 0 size are dubiously valid since they do
2867 2870 * not even contain the NUL string. Ignore them.
2868 2871 */
2869 2872 if (isp->is_shdr->sh_size == 0)
2870 2873 continue;
2871 2874
2872 2875 /*
2873 2876 * We have at least one non-discarded section.
2874 2877 * Create a string table descriptor.
2875 2878 */
2876 2879 if ((mstrtab = st_new(FLG_STNEW_COMPRESS)) == NULL)
2877 2880 return (S_ERROR);
2878 2881 break;
2879 2882 }
2880 2883
2881 2884 /* If no string table was created, we have no mergeable sections */
2882 2885 if (mstrtab == NULL)
2883 2886 return (1);
2884 2887
2885 2888 /*
2886 2889 * This routine has to make 3 passes:
2887 2890 *
2888 2891 * 1) Examine all relocations, insert strings from relocations
2889 2892 * to the mergeable input sections into the string table.
2890 2893 * 2) Modify the relocation values to be correct for the
2891 2894 * new merged section.
2892 2895 * 3) Modify the symbols used by the relocations to reference
2893 2896 * the new section.
2894 2897 *
2895 2898 * These passes cannot be combined:
2896 2899 * - The string table code works in two passes, and all
2897 2900 * strings have to be loaded in pass one before the
2898 2901 * offset of any strings can be determined.
2899 2902 * - Multiple relocations reference a single symbol, so the
2900 2903 * symbol cannot be modified until all relocations are
2901 2904 * fixed.
2902 2905 *
2903 2906 * The number of relocations related to section merging is usually
2904 2907 * a mere fraction of the overall active and output relocation lists,
2905 2908 * and the number of symbols is usually a fraction of the number
2906 2909 * of related relocations. We therefore build APlists for the
2907 2910 * relocations and symbols in the first pass, and then use those
2908 2911 * lists to accelerate the operation of pass 2 and 3.
2909 2912 *
2910 2913 * Reinitialize the lists to a completely empty state.
2911 2914 */
2912 2915 aplist_reset(*rel_alpp);
2913 2916 aplist_reset(*sym_alpp);
2914 2917
2915 2918 /*
2916 2919 * Pass 1:
2917 2920 *
2918 2921 * Every relocation related to this output section (and the input
2919 2922 * sections that make it up) is found in either the active, or the
2920 2923 * output relocation list, depending on whether the relocation is to
2921 2924 * be processed by this invocation of the linker, or inserted into the
2922 2925 * output object.
2923 2926 *
2924 2927 * Build lists of relocations and symbols that will need modification,
2925 2928 * and insert the strings they reference into the mstrtab string table.
2926 2929 */
2927 2930 if (strmerge_pass1(ofl, osp, mstrtab, rel_alpp, sym_alpp,
2928 2931 &ofl->ofl_actrels) == 0)
2929 2932 goto return_s_error;
2930 2933 if (strmerge_pass1(ofl, osp, mstrtab, rel_alpp, sym_alpp,
2931 2934 &ofl->ofl_outrels) == 0)
2932 2935 goto return_s_error;
2933 2936
2934 2937 /*
2935 2938 * Get the size of the new input section. Requesting the
2936 2939 * string table size "cooks" the table, and finalizes its contents.
2937 2940 */
2938 2941 data_size = st_getstrtab_sz(mstrtab);
2939 2942
2940 2943 /* Create a new input section to hold the merged strings */
2941 2944 if (new_section_from_template(ofl, isp, data_size,
2942 2945 &mstrsec, &mstr_shdr, &mstr_data) == S_ERROR)
2943 2946 goto return_s_error;
2944 2947 mstrsec->is_flags |= FLG_IS_GNSTRMRG;
2945 2948
2946 2949 /*
2947 2950 * Allocate a data buffer for the new input section.
2948 2951 * Then, associate the buffer with the string table descriptor.
2949 2952 */
2950 2953 if ((mstr_data->d_buf = libld_malloc(data_size)) == NULL)
2951 2954 goto return_s_error;
2952 2955 if (st_setstrbuf(mstrtab, mstr_data->d_buf, data_size) == -1)
2953 2956 goto return_s_error;
2954 2957
2955 2958 /* Add the new section to the output image */
2956 2959 if (ld_place_section(ofl, mstrsec, NULL, osp->os_identndx, NULL) ==
2957 2960 (Os_desc *)S_ERROR)
2958 2961 goto return_s_error;
2959 2962
2960 2963 /*
2961 2964 * Pass 2:
2962 2965 *
2963 2966 * Revisit the relocation descriptors with STT_SECTION symbols
2964 2967 * that were saved by the first pass. Update each relocation
2965 2968 * record so that the offset it contains is for the new section
2966 2969 * instead of the original.
2967 2970 */
2968 2971 for (APLIST_TRAVERSE(*rel_alpp, idx, rsp)) {
2969 2972 const char *name;
2970 2973
2971 2974 /* Put the string into the merged string table */
2972 2975 name = strmerge_get_reloc_str(ofl, rsp);
2973 2976 st_setstring_status = st_setstring(mstrtab, name, &stoff);
2974 2977 if (st_setstring_status == -1) {
2975 2978 /*
2976 2979 * A failure to insert at this point means that
2977 2980 * something is corrupt. This isn't a resource issue.
2978 2981 */
2979 2982 assert(st_setstring_status != -1);
2980 2983 goto return_s_error;
2981 2984 }
2982 2985
2983 2986 /*
2984 2987 * Alter the relocation to access the string at the
2985 2988 * new offset in our new string table.
2986 2989 *
2987 2990 * For SHT_RELA platforms, it suffices to simply
2988 2991 * update the rel_raddend field of the relocation.
2989 2992 *
2990 2993 * For SHT_REL platforms, the new "addend" value
2991 2994 * needs to be written at the address being relocated.
2992 2995 * However, we can't alter the input sections which
2993 2996 * are mapped readonly, and the output image has not
2994 2997 * been created yet. So, we defer this operation,
2995 2998 * using the rel_raddend field of the relocation
2996 2999 * which is normally 0 on a REL platform, to pass the
2997 3000 * new "addend" value to ld_perform_outreloc() or
2998 3001 * ld_do_activerelocs(). The FLG_REL_NADDEND flag
2999 3002 * tells them that this is the case.
3000 3003 */
3001 3004 if ((rsp->rel_flags & FLG_REL_RELA) == 0) /* REL */
3002 3005 rsp->rel_flags |= FLG_REL_NADDEND;
3003 3006 rsp->rel_raddend = (Sxword)stoff;
3004 3007
3005 3008 /*
3006 3009 * Generate a symbol name string for STT_SECTION symbols
3007 3010 * that might reference our merged section. This shows up
3008 3011 * in debug output and helps show how the relocation has
3009 3012 * changed from its original input section to our merged one.
3010 3013 */
3011 3014 if (ld_stt_section_sym_name(mstrsec) == NULL)
3012 3015 goto return_s_error;
3013 3016 }
3014 3017
3015 3018 /*
3016 3019 * Pass 3:
3017 3020 *
3018 3021 * Modify the symbols referenced by the relocation descriptors
3019 3022 * so that they reference the new input section containing the
3020 3023 * merged strings instead of the original input sections.
3021 3024 */
3022 3025 for (APLIST_TRAVERSE(*sym_alpp, idx, sdp)) {
3023 3026 /*
3024 3027 * If we've already processed this symbol, don't do it
3025 3028 * twice. strmerge_pass1() uses a heuristic (relocations to
3026 3029 * the same symbol clump together) to avoid inserting a
3027 3030 * given symbol more than once, but repeat symbols in
3028 3031 * the list can occur.
3029 3032 */
3030 3033 if ((sdp->sd_isc->is_flags & FLG_IS_INSTRMRG) == 0)
3031 3034 continue;
3032 3035
3033 3036 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_SECTION) {
3034 3037 /*
3035 3038 * This is not an STT_SECTION symbol, so its
3036 3039 * value is the offset of the string within the
3037 3040 * input section. Update the address to reflect
3038 3041 * the address in our new merged section.
3039 3042 */
3040 3043 const char *name = sdp->sd_sym->st_value +
3041 3044 (char *)sdp->sd_isc->is_indata->d_buf;
3042 3045
3043 3046 st_setstring_status =
3044 3047 st_setstring(mstrtab, name, &stoff);
3045 3048 if (st_setstring_status == -1) {
3046 3049 /*
3047 3050 * A failure to insert at this point means
3048 3051 * something is corrupt. This isn't a
3049 3052 * resource issue.
3050 3053 */
3051 3054 assert(st_setstring_status != -1);
3052 3055 goto return_s_error;
3053 3056 }
3054 3057
3055 3058 if (ld_sym_copy(sdp) == S_ERROR)
3056 3059 goto return_s_error;
3057 3060 sdp->sd_sym->st_value = (Word)stoff;
3058 3061 }
3059 3062
3060 3063 /* Redirect the symbol to our new merged section */
3061 3064 sdp->sd_isc = mstrsec;
3062 3065 }
3063 3066
3064 3067 /*
3065 3068 * There are no references left to the original input string sections.
3066 3069 * Mark them as discarded so they don't go into the output image.
3067 3070 * At the same time, add up the sizes of the replaced sections.
3068 3071 */
3069 3072 data_size = 0;
3070 3073 for (APLIST_TRAVERSE(osp->os_mstrisdescs, idx, isp)) {
3071 3074 if (isp->is_flags & (FLG_IS_DISCARD | FLG_IS_GNSTRMRG))
3072 3075 continue;
3073 3076
3074 3077 data_size += isp->is_indata->d_size;
3075 3078
3076 3079 isp->is_flags |= FLG_IS_DISCARD;
3077 3080 DBG_CALL(Dbg_sec_discarded(ofl->ofl_lml, isp, mstrsec));
3078 3081 }
3079 3082
3080 3083 /* Report how much space we saved in the output section */
3081 3084 DBG_CALL(Dbg_sec_genstr_compress(ofl->ofl_lml, osp->os_name, data_size,
3082 3085 mstr_data->d_size));
3083 3086
3084 3087 st_destroy(mstrtab);
3085 3088 return (1);
3086 3089
3087 3090 return_s_error:
3088 3091 st_destroy(mstrtab);
3089 3092 return (S_ERROR);
3090 3093 }
3091 3094
3092 3095 /*
3093 3096 * Update a data buffers size. A number of sections have to be created, and
3094 3097 * the sections header contributes to the size of the eventual section. Thus,
3095 3098 * a section may be created, and once all associated sections have been created,
3096 3099 * we return to establish the required section size.
3097 3100 */
3098 3101 inline static void
3099 3102 update_data_size(Os_desc *osp, ulong_t cnt)
3100 3103 {
3101 3104 Is_desc *isec = ld_os_first_isdesc(osp);
3102 3105 Elf_Data *data = isec->is_indata;
3103 3106 Shdr *shdr = osp->os_shdr;
3104 3107 size_t size = cnt * shdr->sh_entsize;
3105 3108
3106 3109 shdr->sh_size = (Xword)size;
3107 3110 data->d_size = size;
3108 3111 }
3109 3112
3110 3113 /*
3111 3114 * The following sections are built after all input file processing and symbol
3112 3115 * validation has been carried out. The order is important (because the
3113 3116 * addition of a section adds a new symbol there is a chicken and egg problem
3114 3117 * of maintaining the appropriate counts). By maintaining a known order the
3115 3118 * individual routines can compensate for later, known, additions.
3116 3119 */
3117 3120 uintptr_t
3118 3121 ld_make_sections(Ofl_desc *ofl)
3119 3122 {
3120 3123 ofl_flag_t flags = ofl->ofl_flags;
3121 3124 Sg_desc *sgp;
3122 3125
3123 3126 /*
3124 3127 * Generate any special sections.
3125 3128 */
3126 3129 if (flags & FLG_OF_ADDVERS)
3127 3130 if (make_comment(ofl) == S_ERROR)
3128 3131 return (S_ERROR);
3129 3132
3130 3133 if (make_interp(ofl) == S_ERROR)
3131 3134 return (S_ERROR);
3132 3135
3133 3136 /*
3134 3137 * Create a capabilities section if required.
3135 3138 */
3136 3139 if (make_cap(ofl, SHT_SUNW_cap, MSG_ORIG(MSG_SCN_SUNWCAP),
3137 3140 ld_targ.t_id.id_cap) == S_ERROR)
3138 3141 return (S_ERROR);
3139 3142
3140 3143 /*
3141 3144 * Create any init/fini array sections.
3142 3145 */
3143 3146 if (make_array(ofl, SHT_INIT_ARRAY, MSG_ORIG(MSG_SCN_INITARRAY),
3144 3147 ofl->ofl_initarray) == S_ERROR)
3145 3148 return (S_ERROR);
3146 3149
3147 3150 if (make_array(ofl, SHT_FINI_ARRAY, MSG_ORIG(MSG_SCN_FINIARRAY),
3148 3151 ofl->ofl_finiarray) == S_ERROR)
3149 3152 return (S_ERROR);
3150 3153
3151 3154 if (make_array(ofl, SHT_PREINIT_ARRAY, MSG_ORIG(MSG_SCN_PREINITARRAY),
3152 3155 ofl->ofl_preiarray) == S_ERROR)
3153 3156 return (S_ERROR);
3154 3157
3155 3158 /*
3156 3159 * Make the .plt section. This occurs after any other relocation
3157 3160 * sections are generated (see reloc_init()) to ensure that the
3158 3161 * associated relocation section is after all the other relocation
3159 3162 * sections.
3160 3163 */
3161 3164 if ((ofl->ofl_pltcnt) || (ofl->ofl_pltpad))
3162 3165 if (make_plt(ofl) == S_ERROR)
3163 3166 return (S_ERROR);
3164 3167
3165 3168 /*
3166 3169 * Determine whether any sections or files are not referenced. Under
3167 3170 * -Dunused a diagnostic for any unused components is generated, under
3168 3171 * -zignore the component is removed from the final output.
3169 3172 */
3170 3173 if (DBG_ENABLED || (ofl->ofl_flags1 & FLG_OF1_IGNPRC)) {
3171 3174 if (ignore_section_processing(ofl) == S_ERROR)
3172 3175 return (S_ERROR);
3173 3176 }
3174 3177
3175 3178 /*
3176 3179 * If we have detected a situation in which previously placed
3177 3180 * output sections may have been discarded, perform the necessary
3178 3181 * readjustment.
3179 3182 */
3180 3183 if (ofl->ofl_flags & FLG_OF_ADJOSCNT)
3181 3184 adjust_os_count(ofl);
3182 3185
3183 3186 /*
3184 3187 * Do any of the output sections contain input sections that
3185 3188 * are candidates for string table merging? For each such case,
3186 3189 * we create a replacement section, insert it, and discard the
3187 3190 * originals.
3188 3191 *
3189 3192 * rel_alpp and sym_alpp are used by ld_make_strmerge()
3190 3193 * for its internal processing. We are responsible for the
3191 3194 * initialization and cleanup, and ld_make_strmerge() handles the rest.
3192 3195 * This allows us to reuse a single pair of memory buffers, allocated
3193 3196 * for this processing, for all the output sections.
3194 3197 */
3195 3198 if ((ofl->ofl_flags1 & FLG_OF1_NCSTTAB) == 0) {
3196 3199 int error_seen = 0;
3197 3200 APlist *rel_alpp = NULL;
3198 3201 APlist *sym_alpp = NULL;
3199 3202 Aliste idx1;
3200 3203
3201 3204 for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
3202 3205 Os_desc *osp;
3203 3206 Aliste idx2;
3204 3207
3205 3208 for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp))
3206 3209 if ((osp->os_mstrisdescs != NULL) &&
3207 3210 (ld_make_strmerge(ofl, osp,
3208 3211 &rel_alpp, &sym_alpp) ==
3209 3212 S_ERROR)) {
3210 3213 error_seen = 1;
3211 3214 break;
3212 3215 }
3213 3216 }
3214 3217 if (rel_alpp != NULL)
3215 3218 libld_free(rel_alpp);
3216 3219 if (sym_alpp != NULL)
3217 3220 libld_free(sym_alpp);
3218 3221 if (error_seen != 0)
3219 3222 return (S_ERROR);
3220 3223 }
3221 3224
3222 3225 /*
3223 3226 * Add any necessary versioning information.
3224 3227 */
3225 3228 if (!(flags & FLG_OF_NOVERSEC)) {
3226 3229 if ((flags & FLG_OF_VERNEED) &&
3227 3230 (make_verneed(ofl) == S_ERROR))
3228 3231 return (S_ERROR);
3229 3232 if ((flags & FLG_OF_VERDEF) &&
3230 3233 (make_verdef(ofl) == S_ERROR))
3231 3234 return (S_ERROR);
3232 3235 if ((flags & (FLG_OF_VERNEED | FLG_OF_VERDEF)) &&
3233 3236 ((ofl->ofl_osversym = make_sym_sec(ofl,
3234 3237 MSG_ORIG(MSG_SCN_SUNWVERSYM), SHT_SUNW_versym,
3235 3238 ld_targ.t_id.id_version)) == (Os_desc*)S_ERROR))
3236 3239 return (S_ERROR);
3237 3240 }
3238 3241
3239 3242 /*
3240 3243 * Create a syminfo section if necessary.
3241 3244 */
3242 3245 if (flags & FLG_OF_SYMINFO) {
3243 3246 if ((ofl->ofl_ossyminfo = make_sym_sec(ofl,
3244 3247 MSG_ORIG(MSG_SCN_SUNWSYMINFO), SHT_SUNW_syminfo,
3245 3248 ld_targ.t_id.id_syminfo)) == (Os_desc *)S_ERROR)
3246 3249 return (S_ERROR);
3247 3250 }
3248 3251
3249 3252 if (flags & FLG_OF_COMREL) {
3250 3253 /*
3251 3254 * If -zcombreloc is enabled then all relocations (except for
3252 3255 * the PLT's) are coalesced into a single relocation section.
3253 3256 */
3254 3257 if (ofl->ofl_reloccnt) {
3255 3258 if (make_reloc(ofl, NULL) == S_ERROR)
3256 3259 return (S_ERROR);
3257 3260 }
3258 3261 } else {
3259 3262 Aliste idx1;
3260 3263
3261 3264 /*
3262 3265 * Create the required output relocation sections. Note, new
3263 3266 * sections may be added to the section list that is being
3264 3267 * traversed. These insertions can move the elements of the
3265 3268 * Alist such that a section descriptor is re-read. Recursion
3266 3269 * is prevented by maintaining a previous section pointer and
3267 3270 * insuring that this pointer isn't re-examined.
3268 3271 */
3269 3272 for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
3270 3273 Os_desc *osp, *posp = 0;
3271 3274 Aliste idx2;
3272 3275
3273 3276 for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp)) {
3274 3277 if ((osp != posp) && osp->os_szoutrels &&
3275 3278 (osp != ofl->ofl_osplt)) {
3276 3279 if (make_reloc(ofl, osp) == S_ERROR)
3277 3280 return (S_ERROR);
3278 3281 }
3279 3282 posp = osp;
3280 3283 }
3281 3284 }
3282 3285
3283 3286 /*
3284 3287 * If we're not building a combined relocation section, then
3285 3288 * build a .rel[a] section as required.
3286 3289 */
3287 3290 if (ofl->ofl_relocrelsz) {
3288 3291 if (make_reloc(ofl, NULL) == S_ERROR)
3289 3292 return (S_ERROR);
3290 3293 }
3291 3294 }
3292 3295
3293 3296 /*
3294 3297 * The PLT relocations are always in their own section, and we try to
3295 3298 * keep them at the end of the PLT table. We do this to keep the hot
3296 3299 * "data" PLT's at the head of the table nearer the .dynsym & .hash.
3297 3300 */
3298 3301 if (ofl->ofl_osplt && ofl->ofl_relocpltsz) {
3299 3302 if (make_reloc(ofl, ofl->ofl_osplt) == S_ERROR)
3300 3303 return (S_ERROR);
3301 3304 }
3302 3305
3303 3306 /*
3304 3307 * Finally build the symbol and section header sections.
3305 3308 */
3306 3309 if (flags & FLG_OF_DYNAMIC) {
3307 3310 if (make_dynamic(ofl) == S_ERROR)
3308 3311 return (S_ERROR);
3309 3312
3310 3313 /*
3311 3314 * A number of sections aren't necessary within a relocatable
3312 3315 * object, even if -dy has been used.
3313 3316 */
3314 3317 if (!(flags & FLG_OF_RELOBJ)) {
3315 3318 if (make_hash(ofl) == S_ERROR)
3316 3319 return (S_ERROR);
3317 3320 if (make_dynstr(ofl) == S_ERROR)
3318 3321 return (S_ERROR);
3319 3322 if (make_dynsym(ofl) == S_ERROR)
3320 3323 return (S_ERROR);
3321 3324 if (ld_unwind_make_hdr(ofl) == S_ERROR)
3322 3325 return (S_ERROR);
3323 3326 if (make_dynsort(ofl) == S_ERROR)
3324 3327 return (S_ERROR);
3325 3328 }
3326 3329 }
3327 3330
3328 3331 if (!(flags & FLG_OF_STRIP) || (flags & FLG_OF_RELOBJ) ||
3329 3332 ((flags & FLG_OF_STATIC) && ofl->ofl_osversym)) {
3330 3333 /*
3331 3334 * Do we need to make a SHT_SYMTAB_SHNDX section
3332 3335 * for the dynsym. If so - do it now.
3333 3336 */
3334 3337 if (ofl->ofl_osdynsym &&
3335 3338 ((ofl->ofl_shdrcnt + 3) >= SHN_LORESERVE)) {
3336 3339 if (make_dynsym_shndx(ofl) == S_ERROR)
3337 3340 return (S_ERROR);
3338 3341 }
3339 3342
3340 3343 if (make_strtab(ofl) == S_ERROR)
3341 3344 return (S_ERROR);
3342 3345 if (make_symtab(ofl) == S_ERROR)
3343 3346 return (S_ERROR);
3344 3347 } else {
3345 3348 /*
3346 3349 * Do we need to make a SHT_SYMTAB_SHNDX section
3347 3350 * for the dynsym. If so - do it now.
3348 3351 */
3349 3352 if (ofl->ofl_osdynsym &&
3350 3353 ((ofl->ofl_shdrcnt + 1) >= SHN_LORESERVE)) {
3351 3354 if (make_dynsym_shndx(ofl) == S_ERROR)
3352 3355 return (S_ERROR);
3353 3356 }
3354 3357 }
3355 3358
3356 3359 if (make_shstrtab(ofl) == S_ERROR)
3357 3360 return (S_ERROR);
3358 3361
3359 3362 /*
3360 3363 * Now that we've created all output sections, adjust the size of the
3361 3364 * SHT_SUNW_versym and SHT_SUNW_syminfo section, which are dependent on
3362 3365 * the associated symbol table sizes.
3363 3366 */
3364 3367 if (ofl->ofl_osversym || ofl->ofl_ossyminfo) {
3365 3368 ulong_t cnt;
3366 3369 Is_desc *isp;
3367 3370 Os_desc *osp;
3368 3371
3369 3372 if (OFL_IS_STATIC_OBJ(ofl))
3370 3373 osp = ofl->ofl_ossymtab;
3371 3374 else
3372 3375 osp = ofl->ofl_osdynsym;
3373 3376
3374 3377 isp = ld_os_first_isdesc(osp);
3375 3378 cnt = (isp->is_shdr->sh_size / isp->is_shdr->sh_entsize);
3376 3379
3377 3380 if (ofl->ofl_osversym)
3378 3381 update_data_size(ofl->ofl_osversym, cnt);
3379 3382
3380 3383 if (ofl->ofl_ossyminfo)
3381 3384 update_data_size(ofl->ofl_ossyminfo, cnt);
3382 3385 }
3383 3386
3384 3387 /*
3385 3388 * Now that we've created all output sections, adjust the size of the
3386 3389 * SHT_SUNW_capinfo, which is dependent on the associated symbol table
3387 3390 * size.
3388 3391 */
3389 3392 if (ofl->ofl_oscapinfo) {
3390 3393 ulong_t cnt;
3391 3394
3392 3395 /*
3393 3396 * Symbol capabilities symbols are placed directly after the
3394 3397 * STT_FILE symbol, section symbols, and any register symbols.
3395 3398 * Effectively these are the first of any series of demoted
3396 3399 * (scoped) symbols.
3397 3400 */
3398 3401 if (OFL_IS_STATIC_OBJ(ofl))
3399 3402 cnt = SYMTAB_ALL_CNT(ofl);
3400 3403 else
3401 3404 cnt = DYNSYM_ALL_CNT(ofl);
3402 3405
3403 3406 update_data_size(ofl->ofl_oscapinfo, cnt);
3404 3407 }
3405 3408 return (1);
3406 3409 }
3407 3410
3408 3411 /*
3409 3412 * Build an additional data section - used to back OBJT symbol definitions
3410 3413 * added with a mapfile.
3411 3414 */
3412 3415 Is_desc *
3413 3416 ld_make_data(Ofl_desc *ofl, size_t size)
3414 3417 {
3415 3418 Shdr *shdr;
3416 3419 Elf_Data *data;
3417 3420 Is_desc *isec;
3418 3421
3419 3422 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_DATA), 0,
3420 3423 &isec, &shdr, &data) == S_ERROR)
3421 3424 return ((Is_desc *)S_ERROR);
3422 3425
3423 3426 data->d_size = size;
3424 3427 shdr->sh_size = (Xword)size;
3425 3428 shdr->sh_flags |= SHF_WRITE;
3426 3429
3427 3430 if (aplist_append(&ofl->ofl_mapdata, isec, AL_CNT_OFL_MAPSECS) == NULL)
3428 3431 return ((Is_desc *)S_ERROR);
3429 3432
3430 3433 return (isec);
3431 3434 }
3432 3435
3433 3436 /*
3434 3437 * Build an additional text section - used to back FUNC symbol definitions
3435 3438 * added with a mapfile.
3436 3439 */
3437 3440 Is_desc *
3438 3441 ld_make_text(Ofl_desc *ofl, size_t size)
3439 3442 {
3440 3443 Shdr *shdr;
3441 3444 Elf_Data *data;
3442 3445 Is_desc *isec;
3443 3446
3444 3447 /*
3445 3448 * Insure the size is sufficient to contain the minimum return
3446 3449 * instruction.
3447 3450 */
3448 3451 if (size < ld_targ.t_nf.nf_size)
3449 3452 size = ld_targ.t_nf.nf_size;
3450 3453
3451 3454 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_TEXT), 0,
3452 3455 &isec, &shdr, &data) == S_ERROR)
3453 3456 return ((Is_desc *)S_ERROR);
3454 3457
3455 3458 data->d_size = size;
3456 3459 shdr->sh_size = (Xword)size;
3457 3460 shdr->sh_flags |= SHF_EXECINSTR;
3458 3461
3459 3462 /*
3460 3463 * Fill the buffer with the appropriate return instruction.
3461 3464 * Note that there is no need to swap bytes on a non-native,
3462 3465 * link, as the data being copied is given in bytes.
3463 3466 */
3464 3467 if ((data->d_buf = libld_calloc(size, 1)) == NULL)
3465 3468 return ((Is_desc *)S_ERROR);
3466 3469 (void) memcpy(data->d_buf, ld_targ.t_nf.nf_template,
3467 3470 ld_targ.t_nf.nf_size);
3468 3471
3469 3472 /*
3470 3473 * If size was larger than required, and the target supplies
3471 3474 * a fill function, use it to fill the balance. If there is no
3472 3475 * fill function, we accept the 0-fill supplied by libld_calloc().
3473 3476 */
3474 3477 if ((ld_targ.t_ff.ff_execfill != NULL) && (size > ld_targ.t_nf.nf_size))
3475 3478 ld_targ.t_ff.ff_execfill(data->d_buf, ld_targ.t_nf.nf_size,
3476 3479 size - ld_targ.t_nf.nf_size);
3477 3480
3478 3481 if (aplist_append(&ofl->ofl_maptext, isec, AL_CNT_OFL_MAPSECS) == NULL)
3479 3482 return ((Is_desc *)S_ERROR);
3480 3483
3481 3484 return (isec);
3482 3485 }
3483 3486
3484 3487 void
3485 3488 ld_comdat_validate(Ofl_desc *ofl, Ifl_desc *ifl)
3486 3489 {
3487 3490 int i;
3488 3491
3489 3492 for (i = 0; i < ifl->ifl_shnum; i++) {
3490 3493 Is_desc *isp = ifl->ifl_isdesc[i];
3491 3494 int types = 0;
3492 3495 char buf[1024] = "";
3493 3496 Group_desc *gr = NULL;
3494 3497
3495 3498 if ((isp == NULL) || (isp->is_flags & FLG_IS_COMDAT) == 0)
3496 3499 continue;
3497 3500
3498 3501 if (isp->is_shdr->sh_type == SHT_SUNW_COMDAT) {
3499 3502 types++;
3500 3503 (void) strlcpy(buf, MSG_ORIG(MSG_STR_SUNW_COMDAT),
3501 3504 sizeof (buf));
3502 3505 }
3503 3506
3504 3507 if (strncmp(MSG_ORIG(MSG_SCN_GNU_LINKONCE), isp->is_name,
3505 3508 MSG_SCN_GNU_LINKONCE_SIZE) == 0) {
3506 3509 types++;
3507 3510 if (types > 1)
3508 3511 (void) strlcat(buf, ", ", sizeof (buf));
3509 3512 (void) strlcat(buf, MSG_ORIG(MSG_SCN_GNU_LINKONCE),
3510 3513 sizeof (buf));
3511 3514 }
3512 3515
3513 3516 if ((isp->is_shdr->sh_flags & SHF_GROUP) &&
3514 3517 ((gr = ld_get_group(ofl, isp)) != NULL) &&
3515 3518 (gr->gd_data[0] & GRP_COMDAT)) {
3516 3519 types++;
3517 3520 if (types > 1)
3518 3521 (void) strlcat(buf, ", ", sizeof (buf));
3519 3522 (void) strlcat(buf, MSG_ORIG(MSG_STR_GROUP),
3520 3523 sizeof (buf));
3521 3524 }
3522 3525
3523 3526 if (types > 1)
3524 3527 ld_eprintf(ofl, ERR_FATAL,
3525 3528 MSG_INTL(MSG_SCN_MULTICOMDAT), ifl->ifl_name,
3526 3529 EC_WORD(isp->is_scnndx), isp->is_name, buf);
3527 3530 }
3528 3531 }
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