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uts: Allow for address space randomisation.
Randomise the base addresses of shared objects, non-fixed mappings, the
stack and the heap. Introduce a service, svc:/system/process-security,
and a tool psecflags(1) to control and observe it
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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
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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 */
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 +
1273 + if (ofl->ofl_aslr != 0) /* DT_SUNW_ASLR */
1274 + cnt++;
1272 1275 }
1273 1276
1274 1277 /*
1275 1278 * Account for Architecture dependent .dynamic entries, and defaults.
1276 1279 */
1277 1280 (*ld_targ.t_mr.mr_mach_make_dynamic)(ofl, &cnt);
1278 1281
1279 1282 /*
1280 1283 * DT_FLAGS, DT_FLAGS_1, DT_SUNW_STRPAD, and DT_NULL. Also,
1281 1284 * allow room for the unused extra DT_NULLs. These are included
1282 1285 * to allow an ELF editor room to add items later.
1283 1286 */
1284 1287 cnt += 4 + DYNAMIC_EXTRA_ELTS;
1285 1288
1286 1289 /*
1287 1290 * DT_SUNW_LDMACH. Used to hold the ELF machine code of the
1288 1291 * linker that produced the output object. This information
1289 1292 * allows us to determine whether a given object was linked
1290 1293 * natively, or by a linker running on a different type of
1291 1294 * system. This information can be valuable if one suspects
1292 1295 * that a problem might be due to alignment or byte order issues.
1293 1296 */
1294 1297 cnt++;
1295 1298
1296 1299 /*
1297 1300 * Determine the size of the section from the number of entries.
1298 1301 */
1299 1302 size = cnt * (size_t)shdr->sh_entsize;
1300 1303
1301 1304 shdr->sh_size = (Xword)size;
1302 1305 data->d_size = size;
1303 1306
1304 1307 /*
1305 1308 * There are several tags that are specific to the Solaris osabi
1306 1309 * range which we unconditionally put into any dynamic section
1307 1310 * we create (e.g. DT_SUNW_STRPAD or DT_SUNW_LDMACH). As such,
1308 1311 * any Solaris object with a dynamic section should be tagged as
1309 1312 * ELFOSABI_SOLARIS.
1310 1313 */
1311 1314 ofl->ofl_flags |= FLG_OF_OSABI;
1312 1315
1313 1316 return ((uintptr_t)ofl->ofl_osdynamic);
1314 1317 }
1315 1318
1316 1319 /*
1317 1320 * Build the GOT section and its associated relocation entries.
1318 1321 */
1319 1322 uintptr_t
1320 1323 ld_make_got(Ofl_desc *ofl)
1321 1324 {
1322 1325 Elf_Data *data;
1323 1326 Shdr *shdr;
1324 1327 Is_desc *isec;
1325 1328 size_t size = (size_t)ofl->ofl_gotcnt * ld_targ.t_m.m_got_entsize;
1326 1329 size_t rsize = (size_t)ofl->ofl_relocgotsz;
1327 1330
1328 1331 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_GOT), 0,
1329 1332 &isec, &shdr, &data) == S_ERROR)
1330 1333 return (S_ERROR);
1331 1334
1332 1335 data->d_size = size;
1333 1336
1334 1337 shdr->sh_flags |= SHF_WRITE;
1335 1338 shdr->sh_size = (Xword)size;
1336 1339 shdr->sh_entsize = ld_targ.t_m.m_got_entsize;
1337 1340
1338 1341 ofl->ofl_osgot = ld_place_section(ofl, isec, NULL,
1339 1342 ld_targ.t_id.id_got, NULL);
1340 1343 if (ofl->ofl_osgot == (Os_desc *)S_ERROR)
1341 1344 return (S_ERROR);
1342 1345
1343 1346 ofl->ofl_osgot->os_szoutrels = (Xword)rsize;
1344 1347
1345 1348 return (1);
1346 1349 }
1347 1350
1348 1351 /*
1349 1352 * Build an interpreter section.
1350 1353 */
1351 1354 static uintptr_t
1352 1355 make_interp(Ofl_desc *ofl)
1353 1356 {
1354 1357 Shdr *shdr;
1355 1358 Elf_Data *data;
1356 1359 Is_desc *isec;
1357 1360 const char *iname = ofl->ofl_interp;
1358 1361 size_t size;
1359 1362
1360 1363 /*
1361 1364 * If -z nointerp is in effect, don't create an interpreter section.
1362 1365 */
1363 1366 if (ofl->ofl_flags1 & FLG_OF1_NOINTRP)
1364 1367 return (1);
1365 1368
1366 1369 /*
1367 1370 * An .interp section is always created for a dynamic executable.
1368 1371 * A user can define the interpreter to use. This definition overrides
1369 1372 * the default that would be recorded in an executable, and triggers
1370 1373 * the creation of an .interp section in any other object. Presumably
1371 1374 * the user knows what they are doing. Refer to the generic ELF ABI
1372 1375 * section 5-4, and the ld(1) -I option.
1373 1376 */
1374 1377 if (((ofl->ofl_flags & (FLG_OF_DYNAMIC | FLG_OF_EXEC |
1375 1378 FLG_OF_RELOBJ)) != (FLG_OF_DYNAMIC | FLG_OF_EXEC)) && !iname)
1376 1379 return (1);
1377 1380
1378 1381 /*
1379 1382 * In the case of a dynamic executable, supply a default interpreter
1380 1383 * if the user has not specified their own.
1381 1384 */
1382 1385 if (iname == NULL)
1383 1386 iname = ofl->ofl_interp = ld_targ.t_m.m_def_interp;
1384 1387
1385 1388 size = strlen(iname) + 1;
1386 1389
1387 1390 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_INTERP), 0,
1388 1391 &isec, &shdr, &data) == S_ERROR)
1389 1392 return (S_ERROR);
1390 1393
1391 1394 data->d_size = size;
1392 1395 shdr->sh_size = (Xword)size;
1393 1396 data->d_align = shdr->sh_addralign = 1;
1394 1397
1395 1398 ofl->ofl_osinterp =
1396 1399 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_interp, NULL);
1397 1400 return ((uintptr_t)ofl->ofl_osinterp);
1398 1401 }
1399 1402
1400 1403 /*
1401 1404 * Common function used to build the SHT_SUNW_versym section, SHT_SUNW_syminfo
1402 1405 * section, and SHT_SUNW_capinfo section. Each of these sections provide
1403 1406 * additional symbol information, and their size parallels the associated
1404 1407 * symbol table.
1405 1408 */
1406 1409 static Os_desc *
1407 1410 make_sym_sec(Ofl_desc *ofl, const char *sectname, Word stype, int ident)
1408 1411 {
1409 1412 Shdr *shdr;
1410 1413 Elf_Data *data;
1411 1414 Is_desc *isec;
1412 1415
1413 1416 /*
1414 1417 * We don't know the size of this section yet, so set it to 0. The
1415 1418 * size gets filled in after the associated symbol table is sized.
1416 1419 */
1417 1420 if (new_section(ofl, stype, sectname, 0, &isec, &shdr, &data) ==
1418 1421 S_ERROR)
1419 1422 return ((Os_desc *)S_ERROR);
1420 1423
1421 1424 return (ld_place_section(ofl, isec, NULL, ident, NULL));
1422 1425 }
1423 1426
1424 1427 /*
1425 1428 * Determine whether a symbol capability is redundant because the object
1426 1429 * capabilities are more restrictive.
1427 1430 */
1428 1431 inline static int
1429 1432 is_cap_redundant(Objcapset *ocapset, Objcapset *scapset)
1430 1433 {
1431 1434 Alist *oalp, *salp;
1432 1435 elfcap_mask_t omsk, smsk;
1433 1436
1434 1437 /*
1435 1438 * Inspect any platform capabilities. If the object defines platform
1436 1439 * capabilities, then the object will only be loaded for those
1437 1440 * platforms. A symbol capability set that doesn't define the same
1438 1441 * platforms is redundant, and a symbol capability that does not provide
1439 1442 * at least one platform name that matches a platform name in the object
1440 1443 * capabilities will never execute (as the object wouldn't have been
1441 1444 * loaded).
1442 1445 */
1443 1446 oalp = ocapset->oc_plat.cl_val;
1444 1447 salp = scapset->oc_plat.cl_val;
1445 1448 if (oalp && ((salp == NULL) || cap_names_match(oalp, salp)))
1446 1449 return (1);
1447 1450
1448 1451 /*
1449 1452 * If the symbol capability set defines platforms, and the object
1450 1453 * doesn't, then the symbol set is more restrictive.
1451 1454 */
1452 1455 if (salp && (oalp == NULL))
1453 1456 return (0);
1454 1457
1455 1458 /*
1456 1459 * Next, inspect any machine name capabilities. If the object defines
1457 1460 * machine name capabilities, then the object will only be loaded for
1458 1461 * those machines. A symbol capability set that doesn't define the same
1459 1462 * machine names is redundant, and a symbol capability that does not
1460 1463 * provide at least one machine name that matches a machine name in the
1461 1464 * object capabilities will never execute (as the object wouldn't have
1462 1465 * been loaded).
1463 1466 */
1464 1467 oalp = ocapset->oc_plat.cl_val;
1465 1468 salp = scapset->oc_plat.cl_val;
1466 1469 if (oalp && ((salp == NULL) || cap_names_match(oalp, salp)))
1467 1470 return (1);
1468 1471
1469 1472 /*
1470 1473 * If the symbol capability set defines machine names, and the object
1471 1474 * doesn't, then the symbol set is more restrictive.
1472 1475 */
1473 1476 if (salp && (oalp == NULL))
1474 1477 return (0);
1475 1478
1476 1479 /*
1477 1480 * Next, inspect any hardware capabilities. If the objects hardware
1478 1481 * capabilities are greater than or equal to that of the symbols
1479 1482 * capabilities, then the symbol capability set is redundant. If the
1480 1483 * symbols hardware capabilities are greater that the objects, then the
1481 1484 * symbol set is more restrictive.
1482 1485 *
1483 1486 * Note that this is a somewhat arbitrary definition, as each capability
1484 1487 * bit is independent of the others, and some of the higher order bits
1485 1488 * could be considered to be less important than lower ones. However,
1486 1489 * this is the only reasonable non-subjective definition.
1487 1490 */
1488 1491 omsk = ocapset->oc_hw_2.cm_val;
1489 1492 smsk = scapset->oc_hw_2.cm_val;
1490 1493 if ((omsk > smsk) || (omsk && (omsk == smsk)))
1491 1494 return (1);
1492 1495 if (omsk < smsk)
1493 1496 return (0);
1494 1497
1495 1498 /*
1496 1499 * Finally, inspect the remaining hardware capabilities.
1497 1500 */
1498 1501 omsk = ocapset->oc_hw_1.cm_val;
1499 1502 smsk = scapset->oc_hw_1.cm_val;
1500 1503 if ((omsk > smsk) || (omsk && (omsk == smsk)))
1501 1504 return (1);
1502 1505
1503 1506 return (0);
1504 1507 }
1505 1508
1506 1509 /*
1507 1510 * Capabilities values might have been assigned excluded values. These
1508 1511 * excluded values should be removed before calculating any capabilities
1509 1512 * sections size.
1510 1513 */
1511 1514 static void
1512 1515 capmask_value(Lm_list *lml, Word type, Capmask *capmask, int *title)
1513 1516 {
1514 1517 /*
1515 1518 * First determine whether any bits should be excluded.
1516 1519 */
1517 1520 if ((capmask->cm_val & capmask->cm_exc) == 0)
1518 1521 return;
1519 1522
1520 1523 DBG_CALL(Dbg_cap_post_title(lml, title));
1521 1524
1522 1525 DBG_CALL(Dbg_cap_val_entry(lml, DBG_STATE_CURRENT, type,
1523 1526 capmask->cm_val, ld_targ.t_m.m_mach));
1524 1527 DBG_CALL(Dbg_cap_val_entry(lml, DBG_STATE_EXCLUDE, type,
1525 1528 capmask->cm_exc, ld_targ.t_m.m_mach));
1526 1529
1527 1530 capmask->cm_val &= ~capmask->cm_exc;
1528 1531
1529 1532 DBG_CALL(Dbg_cap_val_entry(lml, DBG_STATE_RESOLVED, type,
1530 1533 capmask->cm_val, ld_targ.t_m.m_mach));
1531 1534 }
1532 1535
1533 1536 static void
1534 1537 capstr_value(Lm_list *lml, Word type, Caplist *caplist, int *title)
1535 1538 {
1536 1539 Aliste idx1, idx2;
1537 1540 char *estr;
1538 1541 Capstr *capstr;
1539 1542 Boolean found = FALSE;
1540 1543
1541 1544 /*
1542 1545 * First determine whether any strings should be excluded.
1543 1546 */
1544 1547 for (APLIST_TRAVERSE(caplist->cl_exc, idx1, estr)) {
1545 1548 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1546 1549 if (strcmp(estr, capstr->cs_str) == 0) {
1547 1550 found = TRUE;
1548 1551 break;
1549 1552 }
1550 1553 }
1551 1554 }
1552 1555
1553 1556 if (found == FALSE)
1554 1557 return;
1555 1558
1556 1559 /*
1557 1560 * Traverse the current strings, then delete the excluded strings,
1558 1561 * and finally display the resolved strings.
1559 1562 */
1560 1563 if (DBG_ENABLED) {
1561 1564 Dbg_cap_post_title(lml, title);
1562 1565 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1563 1566 Dbg_cap_ptr_entry(lml, DBG_STATE_CURRENT, type,
1564 1567 capstr->cs_str);
1565 1568 }
1566 1569 }
1567 1570 for (APLIST_TRAVERSE(caplist->cl_exc, idx1, estr)) {
1568 1571 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1569 1572 if (strcmp(estr, capstr->cs_str) == 0) {
1570 1573 DBG_CALL(Dbg_cap_ptr_entry(lml,
1571 1574 DBG_STATE_EXCLUDE, type, capstr->cs_str));
1572 1575 alist_delete(caplist->cl_val, &idx2);
1573 1576 break;
1574 1577 }
1575 1578 }
1576 1579 }
1577 1580 if (DBG_ENABLED) {
1578 1581 for (ALIST_TRAVERSE(caplist->cl_val, idx2, capstr)) {
1579 1582 Dbg_cap_ptr_entry(lml, DBG_STATE_RESOLVED, type,
1580 1583 capstr->cs_str);
1581 1584 }
1582 1585 }
1583 1586 }
1584 1587
1585 1588 /*
1586 1589 * Build a capabilities section.
1587 1590 */
1588 1591 #define CAP_UPDATE(cap, capndx, tag, val) \
1589 1592 cap->c_tag = tag; \
1590 1593 cap->c_un.c_val = val; \
1591 1594 cap++, capndx++;
1592 1595
1593 1596 static uintptr_t
1594 1597 make_cap(Ofl_desc *ofl, Word shtype, const char *shname, int ident)
1595 1598 {
1596 1599 Shdr *shdr;
1597 1600 Elf_Data *data;
1598 1601 Is_desc *isec;
1599 1602 Cap *cap;
1600 1603 size_t size = 0;
1601 1604 Word capndx = 0;
1602 1605 Str_tbl *strtbl;
1603 1606 Objcapset *ocapset = &ofl->ofl_ocapset;
1604 1607 Aliste idx1;
1605 1608 Capstr *capstr;
1606 1609 int title = 0;
1607 1610
1608 1611 /*
1609 1612 * Determine which string table to use for any CA_SUNW_MACH,
1610 1613 * CA_SUNW_PLAT, or CA_SUNW_ID strings.
1611 1614 */
1612 1615 if (OFL_IS_STATIC_OBJ(ofl))
1613 1616 strtbl = ofl->ofl_strtab;
1614 1617 else
1615 1618 strtbl = ofl->ofl_dynstrtab;
1616 1619
1617 1620 /*
1618 1621 * If symbol capabilities have been requested, but none have been
1619 1622 * created, warn the user. This scenario can occur if none of the
1620 1623 * input relocatable objects defined any object capabilities.
1621 1624 */
1622 1625 if ((ofl->ofl_flags & FLG_OF_OTOSCAP) && (ofl->ofl_capsymcnt == 0))
1623 1626 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_CAP_NOSYMSFOUND));
1624 1627
1625 1628 /*
1626 1629 * If symbol capabilities have been collected, but no symbols are left
1627 1630 * referencing these capabilities, promote the capability groups back
1628 1631 * to an object capability definition.
1629 1632 */
1630 1633 if ((ofl->ofl_flags & FLG_OF_OTOSCAP) && ofl->ofl_capsymcnt &&
1631 1634 (ofl->ofl_capfamilies == NULL)) {
1632 1635 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_CAP_NOSYMSFOUND));
1633 1636 ld_cap_move_symtoobj(ofl);
1634 1637 ofl->ofl_capsymcnt = 0;
1635 1638 ofl->ofl_capgroups = NULL;
1636 1639 ofl->ofl_flags &= ~FLG_OF_OTOSCAP;
1637 1640 }
1638 1641
1639 1642 /*
1640 1643 * Remove any excluded capabilities.
1641 1644 */
1642 1645 capstr_value(ofl->ofl_lml, CA_SUNW_PLAT, &ocapset->oc_plat, &title);
1643 1646 capstr_value(ofl->ofl_lml, CA_SUNW_MACH, &ocapset->oc_mach, &title);
1644 1647 capmask_value(ofl->ofl_lml, CA_SUNW_HW_2, &ocapset->oc_hw_2, &title);
1645 1648 capmask_value(ofl->ofl_lml, CA_SUNW_HW_1, &ocapset->oc_hw_1, &title);
1646 1649 capmask_value(ofl->ofl_lml, CA_SUNW_SF_1, &ocapset->oc_sf_1, &title);
1647 1650
1648 1651 /*
1649 1652 * Determine how many entries are required for any object capabilities.
1650 1653 */
1651 1654 size += alist_nitems(ocapset->oc_plat.cl_val);
1652 1655 size += alist_nitems(ocapset->oc_mach.cl_val);
1653 1656 if (ocapset->oc_hw_2.cm_val)
1654 1657 size++;
1655 1658 if (ocapset->oc_hw_1.cm_val)
1656 1659 size++;
1657 1660 if (ocapset->oc_sf_1.cm_val)
1658 1661 size++;
1659 1662
1660 1663 /*
1661 1664 * Only identify a capabilities group if the group has content. If a
1662 1665 * capabilities identifier exists, and no other capabilities have been
1663 1666 * supplied, remove the identifier. This scenario could exist if a
1664 1667 * user mistakenly defined a lone identifier, or if an identified group
1665 1668 * was overridden so as to clear the existing capabilities and the
1666 1669 * identifier was not also cleared.
1667 1670 */
1668 1671 if (ocapset->oc_id.cs_str) {
1669 1672 if (size)
1670 1673 size++;
1671 1674 else
1672 1675 ocapset->oc_id.cs_str = NULL;
1673 1676 }
1674 1677 if (size)
1675 1678 size++; /* Add CA_SUNW_NULL */
1676 1679
1677 1680 /*
1678 1681 * Determine how many entries are required for any symbol capabilities.
1679 1682 */
1680 1683 if (ofl->ofl_capsymcnt) {
1681 1684 /*
1682 1685 * If there are no object capabilities, a CA_SUNW_NULL entry
1683 1686 * is required before any symbol capabilities.
1684 1687 */
1685 1688 if (size == 0)
1686 1689 size++;
1687 1690 size += ofl->ofl_capsymcnt;
1688 1691 }
1689 1692
1690 1693 if (size == 0)
1691 1694 return (NULL);
1692 1695
1693 1696 if (new_section(ofl, shtype, shname, size, &isec,
1694 1697 &shdr, &data) == S_ERROR)
1695 1698 return (S_ERROR);
1696 1699
1697 1700 if ((data->d_buf = libld_malloc(shdr->sh_size)) == NULL)
1698 1701 return (S_ERROR);
1699 1702
1700 1703 cap = (Cap *)data->d_buf;
1701 1704
1702 1705 /*
1703 1706 * Fill in any object capabilities. If there is an identifier, then the
1704 1707 * identifier comes first. The remaining items follow in precedence
1705 1708 * order, although the order isn't important for runtime verification.
1706 1709 */
1707 1710 if (ocapset->oc_id.cs_str) {
1708 1711 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1709 1712 if (st_insert(strtbl, ocapset->oc_id.cs_str) == -1)
1710 1713 return (S_ERROR);
1711 1714 ocapset->oc_id.cs_ndx = capndx;
1712 1715 CAP_UPDATE(cap, capndx, CA_SUNW_ID, 0);
1713 1716 }
1714 1717 if (ocapset->oc_plat.cl_val) {
1715 1718 ofl->ofl_flags |= (FLG_OF_PTCAP | FLG_OF_CAPSTRS);
1716 1719
1717 1720 /*
1718 1721 * Insert any platform name strings in the appropriate string
1719 1722 * table. The capability value can't be filled in yet, as the
1720 1723 * final offset of the strings isn't known until later.
1721 1724 */
1722 1725 for (ALIST_TRAVERSE(ocapset->oc_plat.cl_val, idx1, capstr)) {
1723 1726 if (st_insert(strtbl, capstr->cs_str) == -1)
1724 1727 return (S_ERROR);
1725 1728 capstr->cs_ndx = capndx;
1726 1729 CAP_UPDATE(cap, capndx, CA_SUNW_PLAT, 0);
1727 1730 }
1728 1731 }
1729 1732 if (ocapset->oc_mach.cl_val) {
1730 1733 ofl->ofl_flags |= (FLG_OF_PTCAP | FLG_OF_CAPSTRS);
1731 1734
1732 1735 /*
1733 1736 * Insert the machine name strings in the appropriate string
1734 1737 * table. The capability value can't be filled in yet, as the
1735 1738 * final offset of the strings isn't known until later.
1736 1739 */
1737 1740 for (ALIST_TRAVERSE(ocapset->oc_mach.cl_val, idx1, capstr)) {
1738 1741 if (st_insert(strtbl, capstr->cs_str) == -1)
1739 1742 return (S_ERROR);
1740 1743 capstr->cs_ndx = capndx;
1741 1744 CAP_UPDATE(cap, capndx, CA_SUNW_MACH, 0);
1742 1745 }
1743 1746 }
1744 1747 if (ocapset->oc_hw_2.cm_val) {
1745 1748 ofl->ofl_flags |= FLG_OF_PTCAP;
1746 1749 CAP_UPDATE(cap, capndx, CA_SUNW_HW_2, ocapset->oc_hw_2.cm_val);
1747 1750 }
1748 1751 if (ocapset->oc_hw_1.cm_val) {
1749 1752 ofl->ofl_flags |= FLG_OF_PTCAP;
1750 1753 CAP_UPDATE(cap, capndx, CA_SUNW_HW_1, ocapset->oc_hw_1.cm_val);
1751 1754 }
1752 1755 if (ocapset->oc_sf_1.cm_val) {
1753 1756 ofl->ofl_flags |= FLG_OF_PTCAP;
1754 1757 CAP_UPDATE(cap, capndx, CA_SUNW_SF_1, ocapset->oc_sf_1.cm_val);
1755 1758 }
1756 1759 CAP_UPDATE(cap, capndx, CA_SUNW_NULL, 0);
1757 1760
1758 1761 /*
1759 1762 * Fill in any symbol capabilities.
1760 1763 */
1761 1764 if (ofl->ofl_capgroups) {
1762 1765 Cap_group *cgp;
1763 1766
1764 1767 for (APLIST_TRAVERSE(ofl->ofl_capgroups, idx1, cgp)) {
1765 1768 Objcapset *scapset = &cgp->cg_set;
1766 1769 Aliste idx2;
1767 1770 Is_desc *isp;
1768 1771
1769 1772 cgp->cg_ndx = capndx;
1770 1773
1771 1774 if (scapset->oc_id.cs_str) {
1772 1775 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1773 1776 /*
1774 1777 * Insert the identifier string in the
1775 1778 * appropriate string table. The capability
1776 1779 * value can't be filled in yet, as the final
1777 1780 * offset of the string isn't known until later.
1778 1781 */
1779 1782 if (st_insert(strtbl,
1780 1783 scapset->oc_id.cs_str) == -1)
1781 1784 return (S_ERROR);
1782 1785 scapset->oc_id.cs_ndx = capndx;
1783 1786 CAP_UPDATE(cap, capndx, CA_SUNW_ID, 0);
1784 1787 }
1785 1788
1786 1789 if (scapset->oc_plat.cl_val) {
1787 1790 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1788 1791
1789 1792 /*
1790 1793 * Insert the platform name string in the
1791 1794 * appropriate string table. The capability
1792 1795 * value can't be filled in yet, as the final
1793 1796 * offset of the string isn't known until later.
1794 1797 */
1795 1798 for (ALIST_TRAVERSE(scapset->oc_plat.cl_val,
1796 1799 idx2, capstr)) {
1797 1800 if (st_insert(strtbl,
1798 1801 capstr->cs_str) == -1)
1799 1802 return (S_ERROR);
1800 1803 capstr->cs_ndx = capndx;
1801 1804 CAP_UPDATE(cap, capndx,
1802 1805 CA_SUNW_PLAT, 0);
1803 1806 }
1804 1807 }
1805 1808 if (scapset->oc_mach.cl_val) {
1806 1809 ofl->ofl_flags |= FLG_OF_CAPSTRS;
1807 1810
1808 1811 /*
1809 1812 * Insert the machine name string in the
1810 1813 * appropriate string table. The capability
1811 1814 * value can't be filled in yet, as the final
1812 1815 * offset of the string isn't known until later.
1813 1816 */
1814 1817 for (ALIST_TRAVERSE(scapset->oc_mach.cl_val,
1815 1818 idx2, capstr)) {
1816 1819 if (st_insert(strtbl,
1817 1820 capstr->cs_str) == -1)
1818 1821 return (S_ERROR);
1819 1822 capstr->cs_ndx = capndx;
1820 1823 CAP_UPDATE(cap, capndx,
1821 1824 CA_SUNW_MACH, 0);
1822 1825 }
1823 1826 }
1824 1827 if (scapset->oc_hw_2.cm_val) {
1825 1828 CAP_UPDATE(cap, capndx, CA_SUNW_HW_2,
1826 1829 scapset->oc_hw_2.cm_val);
1827 1830 }
1828 1831 if (scapset->oc_hw_1.cm_val) {
1829 1832 CAP_UPDATE(cap, capndx, CA_SUNW_HW_1,
1830 1833 scapset->oc_hw_1.cm_val);
1831 1834 }
1832 1835 if (scapset->oc_sf_1.cm_val) {
1833 1836 CAP_UPDATE(cap, capndx, CA_SUNW_SF_1,
1834 1837 scapset->oc_sf_1.cm_val);
1835 1838 }
1836 1839 CAP_UPDATE(cap, capndx, CA_SUNW_NULL, 0);
1837 1840
1838 1841 /*
1839 1842 * If any object capabilities are available, determine
1840 1843 * whether these symbol capabilities are less
1841 1844 * restrictive, and hence redundant.
1842 1845 */
1843 1846 if (((ofl->ofl_flags & FLG_OF_PTCAP) == 0) ||
1844 1847 (is_cap_redundant(ocapset, scapset) == 0))
1845 1848 continue;
1846 1849
1847 1850 /*
1848 1851 * Indicate any files that provide redundant symbol
1849 1852 * capabilities.
1850 1853 */
1851 1854 for (APLIST_TRAVERSE(cgp->cg_secs, idx2, isp)) {
1852 1855 ld_eprintf(ofl, ERR_WARNING,
1853 1856 MSG_INTL(MSG_CAP_REDUNDANT),
1854 1857 isp->is_file->ifl_name,
1855 1858 EC_WORD(isp->is_scnndx), isp->is_name);
1856 1859 }
1857 1860 }
1858 1861 }
1859 1862
1860 1863 /*
1861 1864 * If capabilities strings are required, the sh_info field of the
1862 1865 * section header will be set to the associated string table.
1863 1866 */
1864 1867 if (ofl->ofl_flags & FLG_OF_CAPSTRS)
1865 1868 shdr->sh_flags |= SHF_INFO_LINK;
1866 1869
1867 1870 /*
1868 1871 * Place these capabilities in the output file.
1869 1872 */
1870 1873 if ((ofl->ofl_oscap = ld_place_section(ofl, isec,
1871 1874 NULL, ident, NULL)) == (Os_desc *)S_ERROR)
1872 1875 return (S_ERROR);
1873 1876
1874 1877 /*
1875 1878 * If symbol capabilities are required, then a .SUNW_capinfo section is
1876 1879 * also created. This table will eventually be sized to match the
1877 1880 * associated symbol table.
1878 1881 */
1879 1882 if (ofl->ofl_capfamilies) {
1880 1883 if ((ofl->ofl_oscapinfo = make_sym_sec(ofl,
1881 1884 MSG_ORIG(MSG_SCN_SUNWCAPINFO), SHT_SUNW_capinfo,
1882 1885 ld_targ.t_id.id_capinfo)) == (Os_desc *)S_ERROR)
1883 1886 return (S_ERROR);
1884 1887
1885 1888 /*
1886 1889 * If we're generating a dynamic object, capabilities family
1887 1890 * members are maintained in a .SUNW_capchain section.
1888 1891 */
1889 1892 if (ofl->ofl_capchaincnt &&
1890 1893 ((ofl->ofl_flags & FLG_OF_RELOBJ) == 0)) {
1891 1894 if (new_section(ofl, SHT_SUNW_capchain,
1892 1895 MSG_ORIG(MSG_SCN_SUNWCAPCHAIN),
1893 1896 ofl->ofl_capchaincnt, &isec, &shdr,
1894 1897 &data) == S_ERROR)
1895 1898 return (S_ERROR);
1896 1899
1897 1900 ofl->ofl_oscapchain = ld_place_section(ofl, isec,
1898 1901 NULL, ld_targ.t_id.id_capchain, NULL);
1899 1902 if (ofl->ofl_oscapchain == (Os_desc *)S_ERROR)
1900 1903 return (S_ERROR);
1901 1904
1902 1905 }
1903 1906 }
1904 1907 return (1);
1905 1908 }
1906 1909 #undef CAP_UPDATE
1907 1910
1908 1911 /*
1909 1912 * Build the PLT section and its associated relocation entries.
1910 1913 */
1911 1914 static uintptr_t
1912 1915 make_plt(Ofl_desc *ofl)
1913 1916 {
1914 1917 Shdr *shdr;
1915 1918 Elf_Data *data;
1916 1919 Is_desc *isec;
1917 1920 size_t size = ld_targ.t_m.m_plt_reservsz +
1918 1921 (((size_t)ofl->ofl_pltcnt + (size_t)ofl->ofl_pltpad) *
1919 1922 ld_targ.t_m.m_plt_entsize);
1920 1923 size_t rsize = (size_t)ofl->ofl_relocpltsz;
1921 1924
1922 1925 /*
1923 1926 * On sparc, account for the NOP at the end of the plt.
1924 1927 */
1925 1928 if (ld_targ.t_m.m_mach == LD_TARG_BYCLASS(EM_SPARC, EM_SPARCV9))
1926 1929 size += sizeof (Word);
1927 1930
1928 1931 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_PLT), 0,
1929 1932 &isec, &shdr, &data) == S_ERROR)
1930 1933 return (S_ERROR);
1931 1934
1932 1935 data->d_size = size;
1933 1936 data->d_align = ld_targ.t_m.m_plt_align;
1934 1937
1935 1938 shdr->sh_flags = ld_targ.t_m.m_plt_shf_flags;
1936 1939 shdr->sh_size = (Xword)size;
1937 1940 shdr->sh_addralign = ld_targ.t_m.m_plt_align;
1938 1941 shdr->sh_entsize = ld_targ.t_m.m_plt_entsize;
1939 1942
1940 1943 ofl->ofl_osplt = ld_place_section(ofl, isec, NULL,
1941 1944 ld_targ.t_id.id_plt, NULL);
1942 1945 if (ofl->ofl_osplt == (Os_desc *)S_ERROR)
1943 1946 return (S_ERROR);
1944 1947
1945 1948 ofl->ofl_osplt->os_szoutrels = (Xword)rsize;
1946 1949
1947 1950 return (1);
1948 1951 }
1949 1952
1950 1953 /*
1951 1954 * Make the hash table. Only built for dynamic executables and shared
1952 1955 * libraries, and provides hashed lookup into the global symbol table
1953 1956 * (.dynsym) for the run-time linker to resolve symbol lookups.
1954 1957 */
1955 1958 static uintptr_t
1956 1959 make_hash(Ofl_desc *ofl)
1957 1960 {
1958 1961 Shdr *shdr;
1959 1962 Elf_Data *data;
1960 1963 Is_desc *isec;
1961 1964 size_t size;
1962 1965 Word nsyms = ofl->ofl_globcnt;
1963 1966 size_t cnt;
1964 1967
1965 1968 /*
1966 1969 * Allocate section header structures. We set entcnt to 0
1967 1970 * because it's going to change after we place this section.
1968 1971 */
1969 1972 if (new_section(ofl, SHT_HASH, MSG_ORIG(MSG_SCN_HASH), 0,
1970 1973 &isec, &shdr, &data) == S_ERROR)
1971 1974 return (S_ERROR);
1972 1975
1973 1976 /*
1974 1977 * Place the section first since it will affect the local symbol
1975 1978 * count.
1976 1979 */
1977 1980 ofl->ofl_oshash =
1978 1981 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_hash, NULL);
1979 1982 if (ofl->ofl_oshash == (Os_desc *)S_ERROR)
1980 1983 return (S_ERROR);
1981 1984
1982 1985 /*
1983 1986 * Calculate the number of output hash buckets.
1984 1987 */
1985 1988 ofl->ofl_hashbkts = findprime(nsyms);
1986 1989
1987 1990 /*
1988 1991 * The size of the hash table is determined by
1989 1992 *
1990 1993 * i. the initial nbucket and nchain entries (2)
1991 1994 * ii. the number of buckets (calculated above)
1992 1995 * iii. the number of chains (this is based on the number of
1993 1996 * symbols in the .dynsym array).
1994 1997 */
1995 1998 cnt = 2 + ofl->ofl_hashbkts + DYNSYM_ALL_CNT(ofl);
1996 1999 size = cnt * shdr->sh_entsize;
1997 2000
1998 2001 /*
1999 2002 * Finalize the section header and data buffer initialization.
2000 2003 */
2001 2004 if ((data->d_buf = libld_calloc(size, 1)) == NULL)
2002 2005 return (S_ERROR);
2003 2006 data->d_size = size;
2004 2007 shdr->sh_size = (Xword)size;
2005 2008
2006 2009 return (1);
2007 2010 }
2008 2011
2009 2012 /*
2010 2013 * Generate the standard symbol table. Contains all locals and globals,
2011 2014 * and resides in a non-allocatable section (ie. it can be stripped).
2012 2015 */
2013 2016 static uintptr_t
2014 2017 make_symtab(Ofl_desc *ofl)
2015 2018 {
2016 2019 Shdr *shdr;
2017 2020 Elf_Data *data;
2018 2021 Is_desc *isec;
2019 2022 Is_desc *xisec = 0;
2020 2023 size_t size;
2021 2024 Word symcnt;
2022 2025
2023 2026 /*
2024 2027 * Create the section headers. Note that we supply an ent_cnt
2025 2028 * of 0. We won't know the count until the section has been placed.
2026 2029 */
2027 2030 if (new_section(ofl, SHT_SYMTAB, MSG_ORIG(MSG_SCN_SYMTAB), 0,
2028 2031 &isec, &shdr, &data) == S_ERROR)
2029 2032 return (S_ERROR);
2030 2033
2031 2034 /*
2032 2035 * Place the section first since it will affect the local symbol
2033 2036 * count.
2034 2037 */
2035 2038 if ((ofl->ofl_ossymtab = ld_place_section(ofl, isec, NULL,
2036 2039 ld_targ.t_id.id_symtab, NULL)) == (Os_desc *)S_ERROR)
2037 2040 return (S_ERROR);
2038 2041
2039 2042 /*
2040 2043 * At this point we've created all but the 'shstrtab' section.
2041 2044 * Determine if we have to use 'Extended Sections'. If so - then
2042 2045 * also create a SHT_SYMTAB_SHNDX section.
2043 2046 */
2044 2047 if ((ofl->ofl_shdrcnt + 1) >= SHN_LORESERVE) {
2045 2048 Shdr *xshdr;
2046 2049 Elf_Data *xdata;
2047 2050
2048 2051 if (new_section(ofl, SHT_SYMTAB_SHNDX,
2049 2052 MSG_ORIG(MSG_SCN_SYMTAB_SHNDX), 0, &xisec,
2050 2053 &xshdr, &xdata) == S_ERROR)
2051 2054 return (S_ERROR);
2052 2055
2053 2056 if ((ofl->ofl_ossymshndx = ld_place_section(ofl, xisec, NULL,
2054 2057 ld_targ.t_id.id_symtab_ndx, NULL)) == (Os_desc *)S_ERROR)
2055 2058 return (S_ERROR);
2056 2059 }
2057 2060
2058 2061 /*
2059 2062 * Calculated number of symbols, which need to be augmented by
2060 2063 * the (yet to be created) .shstrtab entry.
2061 2064 */
2062 2065 symcnt = (size_t)(1 + SYMTAB_ALL_CNT(ofl));
2063 2066 size = symcnt * shdr->sh_entsize;
2064 2067
2065 2068 /*
2066 2069 * Finalize the section header and data buffer initialization.
2067 2070 */
2068 2071 data->d_size = size;
2069 2072 shdr->sh_size = (Xword)size;
2070 2073
2071 2074 /*
2072 2075 * If we created a SHT_SYMTAB_SHNDX - then set it's sizes too.
2073 2076 */
2074 2077 if (xisec) {
2075 2078 size_t xsize = symcnt * sizeof (Word);
2076 2079
2077 2080 xisec->is_indata->d_size = xsize;
2078 2081 xisec->is_shdr->sh_size = (Xword)xsize;
2079 2082 }
2080 2083
2081 2084 return (1);
2082 2085 }
2083 2086
2084 2087 /*
2085 2088 * Build a dynamic symbol table. These tables reside in the text
2086 2089 * segment of a dynamic executable or shared library.
2087 2090 *
2088 2091 * .SUNW_ldynsym contains local function symbols
2089 2092 * .dynsym contains only globals symbols
2090 2093 *
2091 2094 * The two tables are created adjacent to each other, with .SUNW_ldynsym
2092 2095 * coming first.
2093 2096 */
2094 2097 static uintptr_t
2095 2098 make_dynsym(Ofl_desc *ofl)
2096 2099 {
2097 2100 Shdr *shdr, *lshdr;
2098 2101 Elf_Data *data, *ldata;
2099 2102 Is_desc *isec, *lisec;
2100 2103 size_t size;
2101 2104 Xword cnt;
2102 2105 int allow_ldynsym;
2103 2106
2104 2107 /*
2105 2108 * Unless explicitly disabled, always produce a .SUNW_ldynsym section
2106 2109 * when it is allowed by the file type, even if the resulting
2107 2110 * table only ends up with a single STT_FILE in it. There are
2108 2111 * two reasons: (1) It causes the generation of the DT_SUNW_SYMTAB
2109 2112 * entry in the .dynamic section, which is something we would
2110 2113 * like to encourage, and (2) Without it, we cannot generate
2111 2114 * the associated .SUNW_dyn[sym|tls]sort sections, which are of
2112 2115 * value to DTrace.
2113 2116 *
2114 2117 * In practice, it is extremely rare for an object not to have
2115 2118 * local symbols for .SUNW_ldynsym, so 99% of the time, we'd be
2116 2119 * doing it anyway.
2117 2120 */
2118 2121 allow_ldynsym = OFL_ALLOW_LDYNSYM(ofl);
2119 2122
2120 2123 /*
2121 2124 * Create the section headers. Note that we supply an ent_cnt
2122 2125 * of 0. We won't know the count until the section has been placed.
2123 2126 */
2124 2127 if (allow_ldynsym && new_section(ofl, SHT_SUNW_LDYNSYM,
2125 2128 MSG_ORIG(MSG_SCN_LDYNSYM), 0, &lisec, &lshdr, &ldata) == S_ERROR)
2126 2129 return (S_ERROR);
2127 2130
2128 2131 if (new_section(ofl, SHT_DYNSYM, MSG_ORIG(MSG_SCN_DYNSYM), 0,
2129 2132 &isec, &shdr, &data) == S_ERROR)
2130 2133 return (S_ERROR);
2131 2134
2132 2135 /*
2133 2136 * Place the section(s) first since it will affect the local symbol
2134 2137 * count.
2135 2138 */
2136 2139 if (allow_ldynsym &&
2137 2140 ((ofl->ofl_osldynsym = ld_place_section(ofl, lisec, NULL,
2138 2141 ld_targ.t_id.id_ldynsym, NULL)) == (Os_desc *)S_ERROR))
2139 2142 return (S_ERROR);
2140 2143 ofl->ofl_osdynsym =
2141 2144 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_dynsym, NULL);
2142 2145 if (ofl->ofl_osdynsym == (Os_desc *)S_ERROR)
2143 2146 return (S_ERROR);
2144 2147
2145 2148 cnt = DYNSYM_ALL_CNT(ofl);
2146 2149 size = (size_t)cnt * shdr->sh_entsize;
2147 2150
2148 2151 /*
2149 2152 * Finalize the section header and data buffer initialization.
2150 2153 */
2151 2154 data->d_size = size;
2152 2155 shdr->sh_size = (Xword)size;
2153 2156
2154 2157 /*
2155 2158 * An ldynsym contains local function symbols. It is not
2156 2159 * used for linking, but if present, serves to allow better
2157 2160 * stack traces to be generated in contexts where the symtab
2158 2161 * is not available. (dladdr(), or stripped executable/library files).
2159 2162 */
2160 2163 if (allow_ldynsym) {
2161 2164 cnt = 1 + ofl->ofl_dynlocscnt + ofl->ofl_dynscopecnt;
2162 2165 size = (size_t)cnt * shdr->sh_entsize;
2163 2166
2164 2167 ldata->d_size = size;
2165 2168 lshdr->sh_size = (Xword)size;
2166 2169 }
2167 2170
2168 2171 return (1);
2169 2172 }
2170 2173
2171 2174 /*
2172 2175 * Build .SUNW_dynsymsort and/or .SUNW_dyntlssort sections. These are
2173 2176 * index sections for the .SUNW_ldynsym/.dynsym pair that present data
2174 2177 * and function symbols sorted by address.
2175 2178 */
2176 2179 static uintptr_t
2177 2180 make_dynsort(Ofl_desc *ofl)
2178 2181 {
2179 2182 Shdr *shdr;
2180 2183 Elf_Data *data;
2181 2184 Is_desc *isec;
2182 2185
2183 2186 /* Only do it if the .SUNW_ldynsym section is present */
2184 2187 if (!OFL_ALLOW_LDYNSYM(ofl))
2185 2188 return (1);
2186 2189
2187 2190 /* .SUNW_dynsymsort */
2188 2191 if (ofl->ofl_dynsymsortcnt > 0) {
2189 2192 if (new_section(ofl, SHT_SUNW_symsort,
2190 2193 MSG_ORIG(MSG_SCN_DYNSYMSORT), ofl->ofl_dynsymsortcnt,
2191 2194 &isec, &shdr, &data) == S_ERROR)
2192 2195 return (S_ERROR);
2193 2196
2194 2197 if ((ofl->ofl_osdynsymsort = ld_place_section(ofl, isec, NULL,
2195 2198 ld_targ.t_id.id_dynsort, NULL)) == (Os_desc *)S_ERROR)
2196 2199 return (S_ERROR);
2197 2200 }
2198 2201
2199 2202 /* .SUNW_dyntlssort */
2200 2203 if (ofl->ofl_dyntlssortcnt > 0) {
2201 2204 if (new_section(ofl, SHT_SUNW_tlssort,
2202 2205 MSG_ORIG(MSG_SCN_DYNTLSSORT),
2203 2206 ofl->ofl_dyntlssortcnt, &isec, &shdr, &data) == S_ERROR)
2204 2207 return (S_ERROR);
2205 2208
2206 2209 if ((ofl->ofl_osdyntlssort = ld_place_section(ofl, isec, NULL,
2207 2210 ld_targ.t_id.id_dynsort, NULL)) == (Os_desc *)S_ERROR)
2208 2211 return (S_ERROR);
2209 2212 }
2210 2213
2211 2214 return (1);
2212 2215 }
2213 2216
2214 2217 /*
2215 2218 * Helper routine for make_dynsym_shndx. Builds a
2216 2219 * a SHT_SYMTAB_SHNDX for .dynsym or .SUNW_ldynsym, without knowing
2217 2220 * which one it is.
2218 2221 */
2219 2222 static uintptr_t
2220 2223 make_dyn_shndx(Ofl_desc *ofl, const char *shname, Os_desc *symtab,
2221 2224 Os_desc **ret_os)
2222 2225 {
2223 2226 Is_desc *isec;
2224 2227 Is_desc *dynsymisp;
2225 2228 Shdr *shdr, *dynshdr;
2226 2229 Elf_Data *data;
2227 2230
2228 2231 dynsymisp = ld_os_first_isdesc(symtab);
2229 2232 dynshdr = dynsymisp->is_shdr;
2230 2233
2231 2234 if (new_section(ofl, SHT_SYMTAB_SHNDX, shname,
2232 2235 (dynshdr->sh_size / dynshdr->sh_entsize),
2233 2236 &isec, &shdr, &data) == S_ERROR)
2234 2237 return (S_ERROR);
2235 2238
2236 2239 if ((*ret_os = ld_place_section(ofl, isec, NULL,
2237 2240 ld_targ.t_id.id_dynsym_ndx, NULL)) == (Os_desc *)S_ERROR)
2238 2241 return (S_ERROR);
2239 2242
2240 2243 assert(*ret_os);
2241 2244
2242 2245 return (1);
2243 2246 }
2244 2247
2245 2248 /*
2246 2249 * Build a SHT_SYMTAB_SHNDX for the .dynsym, and .SUNW_ldynsym
2247 2250 */
2248 2251 static uintptr_t
2249 2252 make_dynsym_shndx(Ofl_desc *ofl)
2250 2253 {
2251 2254 /*
2252 2255 * If there is a .SUNW_ldynsym, generate a section for its extended
2253 2256 * index section as well.
2254 2257 */
2255 2258 if (OFL_ALLOW_LDYNSYM(ofl)) {
2256 2259 if (make_dyn_shndx(ofl, MSG_ORIG(MSG_SCN_LDYNSYM_SHNDX),
2257 2260 ofl->ofl_osldynsym, &ofl->ofl_osldynshndx) == S_ERROR)
2258 2261 return (S_ERROR);
2259 2262 }
2260 2263
2261 2264 /* The Generate a section for the dynsym */
2262 2265 if (make_dyn_shndx(ofl, MSG_ORIG(MSG_SCN_DYNSYM_SHNDX),
2263 2266 ofl->ofl_osdynsym, &ofl->ofl_osdynshndx) == S_ERROR)
2264 2267 return (S_ERROR);
2265 2268
2266 2269 return (1);
2267 2270 }
2268 2271
2269 2272
2270 2273 /*
2271 2274 * Build a string table for the section headers.
2272 2275 */
2273 2276 static uintptr_t
2274 2277 make_shstrtab(Ofl_desc *ofl)
2275 2278 {
2276 2279 Shdr *shdr;
2277 2280 Elf_Data *data;
2278 2281 Is_desc *isec;
2279 2282 size_t size;
2280 2283
2281 2284 if (new_section(ofl, SHT_STRTAB, MSG_ORIG(MSG_SCN_SHSTRTAB),
2282 2285 0, &isec, &shdr, &data) == S_ERROR)
2283 2286 return (S_ERROR);
2284 2287
2285 2288 /*
2286 2289 * Place the section first, as it may effect the number of section
2287 2290 * headers to account for.
2288 2291 */
2289 2292 ofl->ofl_osshstrtab =
2290 2293 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_note, NULL);
2291 2294 if (ofl->ofl_osshstrtab == (Os_desc *)S_ERROR)
2292 2295 return (S_ERROR);
2293 2296
2294 2297 size = st_getstrtab_sz(ofl->ofl_shdrsttab);
2295 2298 assert(size > 0);
2296 2299
2297 2300 data->d_size = size;
2298 2301 shdr->sh_size = (Xword)size;
2299 2302
2300 2303 return (1);
2301 2304 }
2302 2305
2303 2306 /*
2304 2307 * Build a string section for the standard symbol table.
2305 2308 */
2306 2309 static uintptr_t
2307 2310 make_strtab(Ofl_desc *ofl)
2308 2311 {
2309 2312 Shdr *shdr;
2310 2313 Elf_Data *data;
2311 2314 Is_desc *isec;
2312 2315 size_t size;
2313 2316
2314 2317 /*
2315 2318 * This string table consists of all the global and local symbols.
2316 2319 * Account for null bytes at end of the file name and the beginning
2317 2320 * of section.
2318 2321 */
2319 2322 if (st_insert(ofl->ofl_strtab, ofl->ofl_name) == -1)
2320 2323 return (S_ERROR);
2321 2324
2322 2325 size = st_getstrtab_sz(ofl->ofl_strtab);
2323 2326 assert(size > 0);
2324 2327
2325 2328 if (new_section(ofl, SHT_STRTAB, MSG_ORIG(MSG_SCN_STRTAB),
2326 2329 0, &isec, &shdr, &data) == S_ERROR)
2327 2330 return (S_ERROR);
2328 2331
2329 2332 /* Set the size of the data area */
2330 2333 data->d_size = size;
2331 2334 shdr->sh_size = (Xword)size;
2332 2335
2333 2336 ofl->ofl_osstrtab =
2334 2337 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_strtab, NULL);
2335 2338 return ((uintptr_t)ofl->ofl_osstrtab);
2336 2339 }
2337 2340
2338 2341 /*
2339 2342 * Build a string table for the dynamic symbol table.
2340 2343 */
2341 2344 static uintptr_t
2342 2345 make_dynstr(Ofl_desc *ofl)
2343 2346 {
2344 2347 Shdr *shdr;
2345 2348 Elf_Data *data;
2346 2349 Is_desc *isec;
2347 2350 size_t size;
2348 2351
2349 2352 /*
2350 2353 * If producing a .SUNW_ldynsym, account for the initial STT_FILE
2351 2354 * symbol that precedes the scope reduced global symbols.
2352 2355 */
2353 2356 if (OFL_ALLOW_LDYNSYM(ofl)) {
2354 2357 if (st_insert(ofl->ofl_dynstrtab, ofl->ofl_name) == -1)
2355 2358 return (S_ERROR);
2356 2359 ofl->ofl_dynscopecnt++;
2357 2360 }
2358 2361
2359 2362 /*
2360 2363 * Account for any local, named register symbols. These locals are
2361 2364 * required for reference from DT_REGISTER .dynamic entries.
2362 2365 */
2363 2366 if (ofl->ofl_regsyms) {
2364 2367 int ndx;
2365 2368
2366 2369 for (ndx = 0; ndx < ofl->ofl_regsymsno; ndx++) {
2367 2370 Sym_desc *sdp;
2368 2371
2369 2372 if ((sdp = ofl->ofl_regsyms[ndx]) == NULL)
2370 2373 continue;
2371 2374
2372 2375 if (!SYM_IS_HIDDEN(sdp) &&
2373 2376 (ELF_ST_BIND(sdp->sd_sym->st_info) != STB_LOCAL))
2374 2377 continue;
2375 2378
2376 2379 if (sdp->sd_sym->st_name == NULL)
2377 2380 continue;
2378 2381
2379 2382 if (st_insert(ofl->ofl_dynstrtab, sdp->sd_name) == -1)
2380 2383 return (S_ERROR);
2381 2384 }
2382 2385 }
2383 2386
2384 2387 /*
2385 2388 * Reserve entries for any per-symbol auxiliary/filter strings.
2386 2389 */
2387 2390 if (ofl->ofl_dtsfltrs != NULL) {
2388 2391 Dfltr_desc *dftp;
2389 2392 Aliste idx;
2390 2393
2391 2394 for (ALIST_TRAVERSE(ofl->ofl_dtsfltrs, idx, dftp))
2392 2395 if (st_insert(ofl->ofl_dynstrtab, dftp->dft_str) == -1)
2393 2396 return (S_ERROR);
2394 2397 }
2395 2398
2396 2399 size = st_getstrtab_sz(ofl->ofl_dynstrtab);
2397 2400 assert(size > 0);
2398 2401
2399 2402 if (new_section(ofl, SHT_STRTAB, MSG_ORIG(MSG_SCN_DYNSTR),
2400 2403 0, &isec, &shdr, &data) == S_ERROR)
2401 2404 return (S_ERROR);
2402 2405
2403 2406 /* Make it allocable if necessary */
2404 2407 if (!(ofl->ofl_flags & FLG_OF_RELOBJ))
2405 2408 shdr->sh_flags |= SHF_ALLOC;
2406 2409
2407 2410 /* Set the size of the data area */
2408 2411 data->d_size = size + DYNSTR_EXTRA_PAD;
2409 2412
2410 2413 shdr->sh_size = (Xword)size;
2411 2414
2412 2415 ofl->ofl_osdynstr =
2413 2416 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_dynstr, NULL);
2414 2417 return ((uintptr_t)ofl->ofl_osdynstr);
2415 2418 }
2416 2419
2417 2420 /*
2418 2421 * Generate an output relocation section which will contain the relocation
2419 2422 * information to be applied to the `osp' section.
2420 2423 *
2421 2424 * If (osp == NULL) then we are creating the coalesced relocation section
2422 2425 * for an executable and/or a shared object.
2423 2426 */
2424 2427 static uintptr_t
2425 2428 make_reloc(Ofl_desc *ofl, Os_desc *osp)
2426 2429 {
2427 2430 Shdr *shdr;
2428 2431 Elf_Data *data;
2429 2432 Is_desc *isec;
2430 2433 size_t size;
2431 2434 Xword sh_flags;
2432 2435 char *sectname;
2433 2436 Os_desc *rosp;
2434 2437 Word relsize;
2435 2438 const char *rel_prefix;
2436 2439
2437 2440 /* LINTED */
2438 2441 if (ld_targ.t_m.m_rel_sht_type == SHT_REL) {
2439 2442 /* REL */
2440 2443 relsize = sizeof (Rel);
2441 2444 rel_prefix = MSG_ORIG(MSG_SCN_REL);
2442 2445 } else {
2443 2446 /* RELA */
2444 2447 relsize = sizeof (Rela);
2445 2448 rel_prefix = MSG_ORIG(MSG_SCN_RELA);
2446 2449 }
2447 2450
2448 2451 if (osp) {
2449 2452 size = osp->os_szoutrels;
2450 2453 sh_flags = osp->os_shdr->sh_flags;
2451 2454 if ((sectname = libld_malloc(strlen(rel_prefix) +
2452 2455 strlen(osp->os_name) + 1)) == 0)
2453 2456 return (S_ERROR);
2454 2457 (void) strcpy(sectname, rel_prefix);
2455 2458 (void) strcat(sectname, osp->os_name);
2456 2459 } else if (ofl->ofl_flags & FLG_OF_COMREL) {
2457 2460 size = (ofl->ofl_reloccnt - ofl->ofl_reloccntsub) * relsize;
2458 2461 sh_flags = SHF_ALLOC;
2459 2462 sectname = (char *)MSG_ORIG(MSG_SCN_SUNWRELOC);
2460 2463 } else {
2461 2464 size = ofl->ofl_relocrelsz;
2462 2465 sh_flags = SHF_ALLOC;
2463 2466 sectname = (char *)rel_prefix;
2464 2467 }
2465 2468
2466 2469 /*
2467 2470 * Keep track of total size of 'output relocations' (to be stored
2468 2471 * in .dynamic)
2469 2472 */
2470 2473 /* LINTED */
2471 2474 ofl->ofl_relocsz += (Xword)size;
2472 2475
2473 2476 if (new_section(ofl, ld_targ.t_m.m_rel_sht_type, sectname, 0, &isec,
2474 2477 &shdr, &data) == S_ERROR)
2475 2478 return (S_ERROR);
2476 2479
2477 2480 data->d_size = size;
2478 2481
2479 2482 shdr->sh_size = (Xword)size;
2480 2483 if (OFL_ALLOW_DYNSYM(ofl) && (sh_flags & SHF_ALLOC))
2481 2484 shdr->sh_flags = SHF_ALLOC;
2482 2485
2483 2486 if (osp) {
2484 2487 /*
2485 2488 * The sh_info field of the SHT_REL* sections points to the
2486 2489 * section the relocations are to be applied to.
2487 2490 */
2488 2491 shdr->sh_flags |= SHF_INFO_LINK;
2489 2492 }
2490 2493
2491 2494 rosp = ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_rel, NULL);
2492 2495 if (rosp == (Os_desc *)S_ERROR)
2493 2496 return (S_ERROR);
2494 2497
2495 2498 /*
2496 2499 * Associate this relocation section to the section its going to
2497 2500 * relocate.
2498 2501 */
2499 2502 if (osp) {
2500 2503 Aliste idx;
2501 2504 Is_desc *risp;
2502 2505
2503 2506 /*
2504 2507 * This is used primarily so that we can update
2505 2508 * SHT_GROUP[sect_no] entries to point to the
2506 2509 * created output relocation sections.
2507 2510 */
2508 2511 for (APLIST_TRAVERSE(osp->os_relisdescs, idx, risp)) {
2509 2512 risp->is_osdesc = rosp;
2510 2513
2511 2514 /*
2512 2515 * If the input relocation section had the SHF_GROUP
2513 2516 * flag set - propagate it to the output relocation
2514 2517 * section.
2515 2518 */
2516 2519 if (risp->is_shdr->sh_flags & SHF_GROUP) {
2517 2520 rosp->os_shdr->sh_flags |= SHF_GROUP;
2518 2521 break;
2519 2522 }
2520 2523 }
2521 2524 osp->os_relosdesc = rosp;
2522 2525 } else
2523 2526 ofl->ofl_osrel = rosp;
2524 2527
2525 2528 /*
2526 2529 * If this is the first relocation section we've encountered save it
2527 2530 * so that the .dynamic entry can be initialized accordingly.
2528 2531 */
2529 2532 if (ofl->ofl_osrelhead == (Os_desc *)0)
2530 2533 ofl->ofl_osrelhead = rosp;
2531 2534
2532 2535 return (1);
2533 2536 }
2534 2537
2535 2538 /*
2536 2539 * Generate version needed section.
2537 2540 */
2538 2541 static uintptr_t
2539 2542 make_verneed(Ofl_desc *ofl)
2540 2543 {
2541 2544 Shdr *shdr;
2542 2545 Elf_Data *data;
2543 2546 Is_desc *isec;
2544 2547
2545 2548 /*
2546 2549 * verneed sections do not have a constant element size, so the
2547 2550 * value of ent_cnt specified here (0) is meaningless.
2548 2551 */
2549 2552 if (new_section(ofl, SHT_SUNW_verneed, MSG_ORIG(MSG_SCN_SUNWVERSION),
2550 2553 0, &isec, &shdr, &data) == S_ERROR)
2551 2554 return (S_ERROR);
2552 2555
2553 2556 /* During version processing we calculated the total size. */
2554 2557 data->d_size = ofl->ofl_verneedsz;
2555 2558 shdr->sh_size = (Xword)ofl->ofl_verneedsz;
2556 2559
2557 2560 ofl->ofl_osverneed =
2558 2561 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_version, NULL);
2559 2562 return ((uintptr_t)ofl->ofl_osverneed);
2560 2563 }
2561 2564
2562 2565 /*
2563 2566 * Generate a version definition section.
2564 2567 *
2565 2568 * o the SHT_SUNW_verdef section defines the versions that exist within this
2566 2569 * image.
2567 2570 */
2568 2571 static uintptr_t
2569 2572 make_verdef(Ofl_desc *ofl)
2570 2573 {
2571 2574 Shdr *shdr;
2572 2575 Elf_Data *data;
2573 2576 Is_desc *isec;
2574 2577 Ver_desc *vdp;
2575 2578 Str_tbl *strtab;
2576 2579
2577 2580 /*
2578 2581 * Reserve a string table entry for the base version dependency (other
2579 2582 * dependencies have symbol representations, which will already be
2580 2583 * accounted for during symbol processing).
2581 2584 */
2582 2585 vdp = (Ver_desc *)ofl->ofl_verdesc->apl_data[0];
2583 2586
2584 2587 if (OFL_IS_STATIC_OBJ(ofl))
2585 2588 strtab = ofl->ofl_strtab;
2586 2589 else
2587 2590 strtab = ofl->ofl_dynstrtab;
2588 2591
2589 2592 if (st_insert(strtab, vdp->vd_name) == -1)
2590 2593 return (S_ERROR);
2591 2594
2592 2595 /*
2593 2596 * verdef sections do not have a constant element size, so the
2594 2597 * value of ent_cnt specified here (0) is meaningless.
2595 2598 */
2596 2599 if (new_section(ofl, SHT_SUNW_verdef, MSG_ORIG(MSG_SCN_SUNWVERSION),
2597 2600 0, &isec, &shdr, &data) == S_ERROR)
2598 2601 return (S_ERROR);
2599 2602
2600 2603 /* During version processing we calculated the total size. */
2601 2604 data->d_size = ofl->ofl_verdefsz;
2602 2605 shdr->sh_size = (Xword)ofl->ofl_verdefsz;
2603 2606
2604 2607 ofl->ofl_osverdef =
2605 2608 ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_version, NULL);
2606 2609 return ((uintptr_t)ofl->ofl_osverdef);
2607 2610 }
2608 2611
2609 2612 /*
2610 2613 * This routine is called when -z nopartial is in effect.
2611 2614 */
2612 2615 uintptr_t
2613 2616 ld_make_parexpn_data(Ofl_desc *ofl, size_t size, Xword align)
2614 2617 {
2615 2618 Shdr *shdr;
2616 2619 Elf_Data *data;
2617 2620 Is_desc *isec;
2618 2621 Os_desc *osp;
2619 2622
2620 2623 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_DATA), 0,
2621 2624 &isec, &shdr, &data) == S_ERROR)
2622 2625 return (S_ERROR);
2623 2626
2624 2627 shdr->sh_flags |= SHF_WRITE;
2625 2628 data->d_size = size;
2626 2629 shdr->sh_size = (Xword)size;
2627 2630 if (align != 0) {
2628 2631 data->d_align = align;
2629 2632 shdr->sh_addralign = align;
2630 2633 }
2631 2634
2632 2635 if ((data->d_buf = libld_calloc(size, 1)) == NULL)
2633 2636 return (S_ERROR);
2634 2637
2635 2638 /*
2636 2639 * Retain handle to this .data input section. Variables using move
2637 2640 * sections (partial initialization) will be redirected here when
2638 2641 * such global references are added and '-z nopartial' is in effect.
2639 2642 */
2640 2643 ofl->ofl_isparexpn = isec;
2641 2644 osp = ld_place_section(ofl, isec, NULL, ld_targ.t_id.id_data, NULL);
2642 2645 if (osp == (Os_desc *)S_ERROR)
2643 2646 return (S_ERROR);
2644 2647
2645 2648 if (!(osp->os_flags & FLG_OS_OUTREL)) {
2646 2649 ofl->ofl_dynshdrcnt++;
2647 2650 osp->os_flags |= FLG_OS_OUTREL;
2648 2651 }
2649 2652 return (1);
2650 2653 }
2651 2654
2652 2655 /*
2653 2656 * Make .sunwmove section
2654 2657 */
2655 2658 uintptr_t
2656 2659 ld_make_sunwmove(Ofl_desc *ofl, int mv_nums)
2657 2660 {
2658 2661 Shdr *shdr;
2659 2662 Elf_Data *data;
2660 2663 Is_desc *isec;
2661 2664 Aliste idx;
2662 2665 Sym_desc *sdp;
2663 2666 int cnt = 1;
2664 2667
2665 2668
2666 2669 if (new_section(ofl, SHT_SUNW_move, MSG_ORIG(MSG_SCN_SUNWMOVE),
2667 2670 mv_nums, &isec, &shdr, &data) == S_ERROR)
2668 2671 return (S_ERROR);
2669 2672
2670 2673 if ((data->d_buf = libld_calloc(data->d_size, 1)) == NULL)
2671 2674 return (S_ERROR);
2672 2675
2673 2676 /*
2674 2677 * Copy move entries
2675 2678 */
2676 2679 for (APLIST_TRAVERSE(ofl->ofl_parsyms, idx, sdp)) {
2677 2680 Aliste idx2;
2678 2681 Mv_desc *mdp;
2679 2682
2680 2683 if (sdp->sd_flags & FLG_SY_PAREXPN)
2681 2684 continue;
2682 2685
2683 2686 for (ALIST_TRAVERSE(sdp->sd_move, idx2, mdp))
2684 2687 mdp->md_oidx = cnt++;
2685 2688 }
2686 2689
2687 2690 if ((ofl->ofl_osmove = ld_place_section(ofl, isec, NULL, 0, NULL)) ==
2688 2691 (Os_desc *)S_ERROR)
2689 2692 return (S_ERROR);
2690 2693
2691 2694 return (1);
2692 2695 }
2693 2696
2694 2697 /*
2695 2698 * Given a relocation descriptor that references a string table
2696 2699 * input section, locate the string referenced and return a pointer
2697 2700 * to it.
2698 2701 */
2699 2702 static const char *
2700 2703 strmerge_get_reloc_str(Ofl_desc *ofl, Rel_desc *rsp)
2701 2704 {
2702 2705 Sym_desc *sdp = rsp->rel_sym;
2703 2706 Xword str_off;
2704 2707
2705 2708 /*
2706 2709 * In the case of an STT_SECTION symbol, the addend of the
2707 2710 * relocation gives the offset into the string section. For
2708 2711 * other symbol types, the symbol value is the offset.
2709 2712 */
2710 2713
2711 2714 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_SECTION) {
2712 2715 str_off = sdp->sd_sym->st_value;
2713 2716 } else if ((rsp->rel_flags & FLG_REL_RELA) == FLG_REL_RELA) {
2714 2717 /*
2715 2718 * For SHT_RELA, the addend value is found in the
2716 2719 * rel_raddend field of the relocation.
2717 2720 */
2718 2721 str_off = rsp->rel_raddend;
2719 2722 } else { /* REL and STT_SECTION */
2720 2723 /*
2721 2724 * For SHT_REL, the "addend" is not part of the relocation
2722 2725 * record. Instead, it is found at the relocation target
2723 2726 * address.
2724 2727 */
2725 2728 uchar_t *addr = (uchar_t *)((uintptr_t)rsp->rel_roffset +
2726 2729 (uintptr_t)rsp->rel_isdesc->is_indata->d_buf);
2727 2730
2728 2731 if (ld_reloc_targval_get(ofl, rsp, addr, &str_off) == 0)
2729 2732 return (0);
2730 2733 }
2731 2734
2732 2735 return (str_off + (char *)sdp->sd_isc->is_indata->d_buf);
2733 2736 }
2734 2737
2735 2738 /*
2736 2739 * First pass over the relocation records for string table merging.
2737 2740 * Build lists of relocations and symbols that will need modification,
2738 2741 * and insert the strings they reference into the mstrtab string table.
2739 2742 *
2740 2743 * entry:
2741 2744 * ofl, osp - As passed to ld_make_strmerge().
2742 2745 * mstrtab - String table to receive input strings. This table
2743 2746 * must be in its first (initialization) pass and not
2744 2747 * yet cooked (st_getstrtab_sz() not yet called).
2745 2748 * rel_alpp - APlist to receive pointer to any relocation
2746 2749 * descriptors with STT_SECTION symbols that reference
2747 2750 * one of the input sections being merged.
2748 2751 * sym_alpp - APlist to receive pointer to any symbols that reference
2749 2752 * one of the input sections being merged.
2750 2753 * rcp - Pointer to cache of relocation descriptors to examine.
2751 2754 * Either &ofl->ofl_actrels (active relocations)
2752 2755 * or &ofl->ofl_outrels (output relocations).
2753 2756 *
2754 2757 * exit:
2755 2758 * On success, rel_alpp and sym_alpp are updated, and
2756 2759 * any strings in the mergeable input sections referenced by
2757 2760 * a relocation has been entered into mstrtab. True (1) is returned.
2758 2761 *
2759 2762 * On failure, False (0) is returned.
2760 2763 */
2761 2764 static int
2762 2765 strmerge_pass1(Ofl_desc *ofl, Os_desc *osp, Str_tbl *mstrtab,
2763 2766 APlist **rel_alpp, APlist **sym_alpp, Rel_cache *rcp)
2764 2767 {
2765 2768 Aliste idx;
2766 2769 Rel_cachebuf *rcbp;
2767 2770 Sym_desc *sdp;
2768 2771 Sym_desc *last_sdp = NULL;
2769 2772 Rel_desc *rsp;
2770 2773 const char *name;
2771 2774
2772 2775 REL_CACHE_TRAVERSE(rcp, idx, rcbp, rsp) {
2773 2776 sdp = rsp->rel_sym;
2774 2777 if ((sdp->sd_isc == NULL) || ((sdp->sd_isc->is_flags &
2775 2778 (FLG_IS_DISCARD | FLG_IS_INSTRMRG)) != FLG_IS_INSTRMRG) ||
2776 2779 (sdp->sd_isc->is_osdesc != osp))
2777 2780 continue;
2778 2781
2779 2782 /*
2780 2783 * Remember symbol for use in the third pass. There is no
2781 2784 * reason to save a given symbol more than once, so we take
2782 2785 * advantage of the fact that relocations to a given symbol
2783 2786 * tend to cluster in the list. If this is the same symbol
2784 2787 * we saved last time, don't bother.
2785 2788 */
2786 2789 if (last_sdp != sdp) {
2787 2790 if (aplist_append(sym_alpp, sdp, AL_CNT_STRMRGSYM) ==
2788 2791 NULL)
2789 2792 return (0);
2790 2793 last_sdp = sdp;
2791 2794 }
2792 2795
2793 2796 /* Enter the string into our new string table */
2794 2797 name = strmerge_get_reloc_str(ofl, rsp);
2795 2798 if (st_insert(mstrtab, name) == -1)
2796 2799 return (0);
2797 2800
2798 2801 /*
2799 2802 * If this is an STT_SECTION symbol, then the second pass
2800 2803 * will need to modify this relocation, so hang on to it.
2801 2804 */
2802 2805 if ((ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) &&
2803 2806 (aplist_append(rel_alpp, rsp, AL_CNT_STRMRGREL) == NULL))
2804 2807 return (0);
2805 2808 }
2806 2809
2807 2810 return (1);
2808 2811 }
2809 2812
2810 2813 /*
2811 2814 * If the output section has any SHF_MERGE|SHF_STRINGS input sections,
2812 2815 * replace them with a single merged/compressed input section.
2813 2816 *
2814 2817 * entry:
2815 2818 * ofl - Output file descriptor
2816 2819 * osp - Output section descriptor
2817 2820 * rel_alpp, sym_alpp, - Address of 2 APlists, to be used
2818 2821 * for internal processing. On the initial call to
2819 2822 * ld_make_strmerge, these list pointers must be NULL.
2820 2823 * The caller is encouraged to pass the same lists back for
2821 2824 * successive calls to this function without freeing
2822 2825 * them in between calls. This causes a single pair of
2823 2826 * memory allocations to be reused multiple times.
2824 2827 *
2825 2828 * exit:
2826 2829 * If section merging is possible, it is done. If no errors are
2827 2830 * encountered, True (1) is returned. On error, S_ERROR.
2828 2831 *
2829 2832 * The contents of rel_alpp and sym_alpp on exit are
2830 2833 * undefined. The caller can free them, or pass them back to a subsequent
2831 2834 * call to this routine, but should not examine their contents.
2832 2835 */
2833 2836 static uintptr_t
2834 2837 ld_make_strmerge(Ofl_desc *ofl, Os_desc *osp, APlist **rel_alpp,
2835 2838 APlist **sym_alpp)
2836 2839 {
2837 2840 Str_tbl *mstrtab; /* string table for string merge secs */
2838 2841 Is_desc *mstrsec; /* Generated string merge section */
2839 2842 Is_desc *isp;
2840 2843 Shdr *mstr_shdr;
2841 2844 Elf_Data *mstr_data;
2842 2845 Sym_desc *sdp;
2843 2846 Rel_desc *rsp;
2844 2847 Aliste idx;
2845 2848 size_t data_size;
2846 2849 int st_setstring_status;
2847 2850 size_t stoff;
2848 2851
2849 2852 /* If string table compression is disabled, there's nothing to do */
2850 2853 if ((ofl->ofl_flags1 & FLG_OF1_NCSTTAB) != 0)
2851 2854 return (1);
2852 2855
2853 2856 /*
2854 2857 * Pass over the mergeable input sections, and if they haven't
2855 2858 * all been discarded, create a string table.
2856 2859 */
2857 2860 mstrtab = NULL;
2858 2861 for (APLIST_TRAVERSE(osp->os_mstrisdescs, idx, isp)) {
2859 2862 if (isdesc_discarded(isp))
2860 2863 continue;
2861 2864
2862 2865 /*
2863 2866 * Input sections of 0 size are dubiously valid since they do
2864 2867 * not even contain the NUL string. Ignore them.
2865 2868 */
2866 2869 if (isp->is_shdr->sh_size == 0)
2867 2870 continue;
2868 2871
2869 2872 /*
2870 2873 * We have at least one non-discarded section.
2871 2874 * Create a string table descriptor.
2872 2875 */
2873 2876 if ((mstrtab = st_new(FLG_STNEW_COMPRESS)) == NULL)
2874 2877 return (S_ERROR);
2875 2878 break;
2876 2879 }
2877 2880
2878 2881 /* If no string table was created, we have no mergeable sections */
2879 2882 if (mstrtab == NULL)
2880 2883 return (1);
2881 2884
2882 2885 /*
2883 2886 * This routine has to make 3 passes:
2884 2887 *
2885 2888 * 1) Examine all relocations, insert strings from relocations
2886 2889 * to the mergeable input sections into the string table.
2887 2890 * 2) Modify the relocation values to be correct for the
2888 2891 * new merged section.
2889 2892 * 3) Modify the symbols used by the relocations to reference
2890 2893 * the new section.
2891 2894 *
2892 2895 * These passes cannot be combined:
2893 2896 * - The string table code works in two passes, and all
2894 2897 * strings have to be loaded in pass one before the
2895 2898 * offset of any strings can be determined.
2896 2899 * - Multiple relocations reference a single symbol, so the
2897 2900 * symbol cannot be modified until all relocations are
2898 2901 * fixed.
2899 2902 *
2900 2903 * The number of relocations related to section merging is usually
2901 2904 * a mere fraction of the overall active and output relocation lists,
2902 2905 * and the number of symbols is usually a fraction of the number
2903 2906 * of related relocations. We therefore build APlists for the
2904 2907 * relocations and symbols in the first pass, and then use those
2905 2908 * lists to accelerate the operation of pass 2 and 3.
2906 2909 *
2907 2910 * Reinitialize the lists to a completely empty state.
2908 2911 */
2909 2912 aplist_reset(*rel_alpp);
2910 2913 aplist_reset(*sym_alpp);
2911 2914
2912 2915 /*
2913 2916 * Pass 1:
2914 2917 *
2915 2918 * Every relocation related to this output section (and the input
2916 2919 * sections that make it up) is found in either the active, or the
2917 2920 * output relocation list, depending on whether the relocation is to
2918 2921 * be processed by this invocation of the linker, or inserted into the
2919 2922 * output object.
2920 2923 *
2921 2924 * Build lists of relocations and symbols that will need modification,
2922 2925 * and insert the strings they reference into the mstrtab string table.
2923 2926 */
2924 2927 if (strmerge_pass1(ofl, osp, mstrtab, rel_alpp, sym_alpp,
2925 2928 &ofl->ofl_actrels) == 0)
2926 2929 goto return_s_error;
2927 2930 if (strmerge_pass1(ofl, osp, mstrtab, rel_alpp, sym_alpp,
2928 2931 &ofl->ofl_outrels) == 0)
2929 2932 goto return_s_error;
2930 2933
2931 2934 /*
2932 2935 * Get the size of the new input section. Requesting the
2933 2936 * string table size "cooks" the table, and finalizes its contents.
2934 2937 */
2935 2938 data_size = st_getstrtab_sz(mstrtab);
2936 2939
2937 2940 /* Create a new input section to hold the merged strings */
2938 2941 if (new_section_from_template(ofl, isp, data_size,
2939 2942 &mstrsec, &mstr_shdr, &mstr_data) == S_ERROR)
2940 2943 goto return_s_error;
2941 2944 mstrsec->is_flags |= FLG_IS_GNSTRMRG;
2942 2945
2943 2946 /*
2944 2947 * Allocate a data buffer for the new input section.
2945 2948 * Then, associate the buffer with the string table descriptor.
2946 2949 */
2947 2950 if ((mstr_data->d_buf = libld_malloc(data_size)) == NULL)
2948 2951 goto return_s_error;
2949 2952 if (st_setstrbuf(mstrtab, mstr_data->d_buf, data_size) == -1)
2950 2953 goto return_s_error;
2951 2954
2952 2955 /* Add the new section to the output image */
2953 2956 if (ld_place_section(ofl, mstrsec, NULL, osp->os_identndx, NULL) ==
2954 2957 (Os_desc *)S_ERROR)
2955 2958 goto return_s_error;
2956 2959
2957 2960 /*
2958 2961 * Pass 2:
2959 2962 *
2960 2963 * Revisit the relocation descriptors with STT_SECTION symbols
2961 2964 * that were saved by the first pass. Update each relocation
2962 2965 * record so that the offset it contains is for the new section
2963 2966 * instead of the original.
2964 2967 */
2965 2968 for (APLIST_TRAVERSE(*rel_alpp, idx, rsp)) {
2966 2969 const char *name;
2967 2970
2968 2971 /* Put the string into the merged string table */
2969 2972 name = strmerge_get_reloc_str(ofl, rsp);
2970 2973 st_setstring_status = st_setstring(mstrtab, name, &stoff);
2971 2974 if (st_setstring_status == -1) {
2972 2975 /*
2973 2976 * A failure to insert at this point means that
2974 2977 * something is corrupt. This isn't a resource issue.
2975 2978 */
2976 2979 assert(st_setstring_status != -1);
2977 2980 goto return_s_error;
2978 2981 }
2979 2982
2980 2983 /*
2981 2984 * Alter the relocation to access the string at the
2982 2985 * new offset in our new string table.
2983 2986 *
2984 2987 * For SHT_RELA platforms, it suffices to simply
2985 2988 * update the rel_raddend field of the relocation.
2986 2989 *
2987 2990 * For SHT_REL platforms, the new "addend" value
2988 2991 * needs to be written at the address being relocated.
2989 2992 * However, we can't alter the input sections which
2990 2993 * are mapped readonly, and the output image has not
2991 2994 * been created yet. So, we defer this operation,
2992 2995 * using the rel_raddend field of the relocation
2993 2996 * which is normally 0 on a REL platform, to pass the
2994 2997 * new "addend" value to ld_perform_outreloc() or
2995 2998 * ld_do_activerelocs(). The FLG_REL_NADDEND flag
2996 2999 * tells them that this is the case.
2997 3000 */
2998 3001 if ((rsp->rel_flags & FLG_REL_RELA) == 0) /* REL */
2999 3002 rsp->rel_flags |= FLG_REL_NADDEND;
3000 3003 rsp->rel_raddend = (Sxword)stoff;
3001 3004
3002 3005 /*
3003 3006 * Generate a symbol name string for STT_SECTION symbols
3004 3007 * that might reference our merged section. This shows up
3005 3008 * in debug output and helps show how the relocation has
3006 3009 * changed from its original input section to our merged one.
3007 3010 */
3008 3011 if (ld_stt_section_sym_name(mstrsec) == NULL)
3009 3012 goto return_s_error;
3010 3013 }
3011 3014
3012 3015 /*
3013 3016 * Pass 3:
3014 3017 *
3015 3018 * Modify the symbols referenced by the relocation descriptors
3016 3019 * so that they reference the new input section containing the
3017 3020 * merged strings instead of the original input sections.
3018 3021 */
3019 3022 for (APLIST_TRAVERSE(*sym_alpp, idx, sdp)) {
3020 3023 /*
3021 3024 * If we've already processed this symbol, don't do it
3022 3025 * twice. strmerge_pass1() uses a heuristic (relocations to
3023 3026 * the same symbol clump together) to avoid inserting a
3024 3027 * given symbol more than once, but repeat symbols in
3025 3028 * the list can occur.
3026 3029 */
3027 3030 if ((sdp->sd_isc->is_flags & FLG_IS_INSTRMRG) == 0)
3028 3031 continue;
3029 3032
3030 3033 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_SECTION) {
3031 3034 /*
3032 3035 * This is not an STT_SECTION symbol, so its
3033 3036 * value is the offset of the string within the
3034 3037 * input section. Update the address to reflect
3035 3038 * the address in our new merged section.
3036 3039 */
3037 3040 const char *name = sdp->sd_sym->st_value +
3038 3041 (char *)sdp->sd_isc->is_indata->d_buf;
3039 3042
3040 3043 st_setstring_status =
3041 3044 st_setstring(mstrtab, name, &stoff);
3042 3045 if (st_setstring_status == -1) {
3043 3046 /*
3044 3047 * A failure to insert at this point means
3045 3048 * something is corrupt. This isn't a
3046 3049 * resource issue.
3047 3050 */
3048 3051 assert(st_setstring_status != -1);
3049 3052 goto return_s_error;
3050 3053 }
3051 3054
3052 3055 if (ld_sym_copy(sdp) == S_ERROR)
3053 3056 goto return_s_error;
3054 3057 sdp->sd_sym->st_value = (Word)stoff;
3055 3058 }
3056 3059
3057 3060 /* Redirect the symbol to our new merged section */
3058 3061 sdp->sd_isc = mstrsec;
3059 3062 }
3060 3063
3061 3064 /*
3062 3065 * There are no references left to the original input string sections.
3063 3066 * Mark them as discarded so they don't go into the output image.
3064 3067 * At the same time, add up the sizes of the replaced sections.
3065 3068 */
3066 3069 data_size = 0;
3067 3070 for (APLIST_TRAVERSE(osp->os_mstrisdescs, idx, isp)) {
3068 3071 if (isp->is_flags & (FLG_IS_DISCARD | FLG_IS_GNSTRMRG))
3069 3072 continue;
3070 3073
3071 3074 data_size += isp->is_indata->d_size;
3072 3075
3073 3076 isp->is_flags |= FLG_IS_DISCARD;
3074 3077 DBG_CALL(Dbg_sec_discarded(ofl->ofl_lml, isp, mstrsec));
3075 3078 }
3076 3079
3077 3080 /* Report how much space we saved in the output section */
3078 3081 DBG_CALL(Dbg_sec_genstr_compress(ofl->ofl_lml, osp->os_name, data_size,
3079 3082 mstr_data->d_size));
3080 3083
3081 3084 st_destroy(mstrtab);
3082 3085 return (1);
3083 3086
3084 3087 return_s_error:
3085 3088 st_destroy(mstrtab);
3086 3089 return (S_ERROR);
3087 3090 }
3088 3091
3089 3092 /*
3090 3093 * Update a data buffers size. A number of sections have to be created, and
3091 3094 * the sections header contributes to the size of the eventual section. Thus,
3092 3095 * a section may be created, and once all associated sections have been created,
3093 3096 * we return to establish the required section size.
3094 3097 */
3095 3098 inline static void
3096 3099 update_data_size(Os_desc *osp, ulong_t cnt)
3097 3100 {
3098 3101 Is_desc *isec = ld_os_first_isdesc(osp);
3099 3102 Elf_Data *data = isec->is_indata;
3100 3103 Shdr *shdr = osp->os_shdr;
3101 3104 size_t size = cnt * shdr->sh_entsize;
3102 3105
3103 3106 shdr->sh_size = (Xword)size;
3104 3107 data->d_size = size;
3105 3108 }
3106 3109
3107 3110 /*
3108 3111 * The following sections are built after all input file processing and symbol
3109 3112 * validation has been carried out. The order is important (because the
3110 3113 * addition of a section adds a new symbol there is a chicken and egg problem
3111 3114 * of maintaining the appropriate counts). By maintaining a known order the
3112 3115 * individual routines can compensate for later, known, additions.
3113 3116 */
3114 3117 uintptr_t
3115 3118 ld_make_sections(Ofl_desc *ofl)
3116 3119 {
3117 3120 ofl_flag_t flags = ofl->ofl_flags;
3118 3121 Sg_desc *sgp;
3119 3122
3120 3123 /*
3121 3124 * Generate any special sections.
3122 3125 */
3123 3126 if (flags & FLG_OF_ADDVERS)
3124 3127 if (make_comment(ofl) == S_ERROR)
3125 3128 return (S_ERROR);
3126 3129
3127 3130 if (make_interp(ofl) == S_ERROR)
3128 3131 return (S_ERROR);
3129 3132
3130 3133 /*
3131 3134 * Create a capabilities section if required.
3132 3135 */
3133 3136 if (make_cap(ofl, SHT_SUNW_cap, MSG_ORIG(MSG_SCN_SUNWCAP),
3134 3137 ld_targ.t_id.id_cap) == S_ERROR)
3135 3138 return (S_ERROR);
3136 3139
3137 3140 /*
3138 3141 * Create any init/fini array sections.
3139 3142 */
3140 3143 if (make_array(ofl, SHT_INIT_ARRAY, MSG_ORIG(MSG_SCN_INITARRAY),
3141 3144 ofl->ofl_initarray) == S_ERROR)
3142 3145 return (S_ERROR);
3143 3146
3144 3147 if (make_array(ofl, SHT_FINI_ARRAY, MSG_ORIG(MSG_SCN_FINIARRAY),
3145 3148 ofl->ofl_finiarray) == S_ERROR)
3146 3149 return (S_ERROR);
3147 3150
3148 3151 if (make_array(ofl, SHT_PREINIT_ARRAY, MSG_ORIG(MSG_SCN_PREINITARRAY),
3149 3152 ofl->ofl_preiarray) == S_ERROR)
3150 3153 return (S_ERROR);
3151 3154
3152 3155 /*
3153 3156 * Make the .plt section. This occurs after any other relocation
3154 3157 * sections are generated (see reloc_init()) to ensure that the
3155 3158 * associated relocation section is after all the other relocation
3156 3159 * sections.
3157 3160 */
3158 3161 if ((ofl->ofl_pltcnt) || (ofl->ofl_pltpad))
3159 3162 if (make_plt(ofl) == S_ERROR)
3160 3163 return (S_ERROR);
3161 3164
3162 3165 /*
3163 3166 * Determine whether any sections or files are not referenced. Under
3164 3167 * -Dunused a diagnostic for any unused components is generated, under
3165 3168 * -zignore the component is removed from the final output.
3166 3169 */
3167 3170 if (DBG_ENABLED || (ofl->ofl_flags1 & FLG_OF1_IGNPRC)) {
3168 3171 if (ignore_section_processing(ofl) == S_ERROR)
3169 3172 return (S_ERROR);
3170 3173 }
3171 3174
3172 3175 /*
3173 3176 * If we have detected a situation in which previously placed
3174 3177 * output sections may have been discarded, perform the necessary
3175 3178 * readjustment.
3176 3179 */
3177 3180 if (ofl->ofl_flags & FLG_OF_ADJOSCNT)
3178 3181 adjust_os_count(ofl);
3179 3182
3180 3183 /*
3181 3184 * Do any of the output sections contain input sections that
3182 3185 * are candidates for string table merging? For each such case,
3183 3186 * we create a replacement section, insert it, and discard the
3184 3187 * originals.
3185 3188 *
3186 3189 * rel_alpp and sym_alpp are used by ld_make_strmerge()
3187 3190 * for its internal processing. We are responsible for the
3188 3191 * initialization and cleanup, and ld_make_strmerge() handles the rest.
3189 3192 * This allows us to reuse a single pair of memory buffers, allocated
3190 3193 * for this processing, for all the output sections.
3191 3194 */
3192 3195 if ((ofl->ofl_flags1 & FLG_OF1_NCSTTAB) == 0) {
3193 3196 int error_seen = 0;
3194 3197 APlist *rel_alpp = NULL;
3195 3198 APlist *sym_alpp = NULL;
3196 3199 Aliste idx1;
3197 3200
3198 3201 for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
3199 3202 Os_desc *osp;
3200 3203 Aliste idx2;
3201 3204
3202 3205 for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp))
3203 3206 if ((osp->os_mstrisdescs != NULL) &&
3204 3207 (ld_make_strmerge(ofl, osp,
3205 3208 &rel_alpp, &sym_alpp) ==
3206 3209 S_ERROR)) {
3207 3210 error_seen = 1;
3208 3211 break;
3209 3212 }
3210 3213 }
3211 3214 if (rel_alpp != NULL)
3212 3215 libld_free(rel_alpp);
3213 3216 if (sym_alpp != NULL)
3214 3217 libld_free(sym_alpp);
3215 3218 if (error_seen != 0)
3216 3219 return (S_ERROR);
3217 3220 }
3218 3221
3219 3222 /*
3220 3223 * Add any necessary versioning information.
3221 3224 */
3222 3225 if (!(flags & FLG_OF_NOVERSEC)) {
3223 3226 if ((flags & FLG_OF_VERNEED) &&
3224 3227 (make_verneed(ofl) == S_ERROR))
3225 3228 return (S_ERROR);
3226 3229 if ((flags & FLG_OF_VERDEF) &&
3227 3230 (make_verdef(ofl) == S_ERROR))
3228 3231 return (S_ERROR);
3229 3232 if ((flags & (FLG_OF_VERNEED | FLG_OF_VERDEF)) &&
3230 3233 ((ofl->ofl_osversym = make_sym_sec(ofl,
3231 3234 MSG_ORIG(MSG_SCN_SUNWVERSYM), SHT_SUNW_versym,
3232 3235 ld_targ.t_id.id_version)) == (Os_desc*)S_ERROR))
3233 3236 return (S_ERROR);
3234 3237 }
3235 3238
3236 3239 /*
3237 3240 * Create a syminfo section if necessary.
3238 3241 */
3239 3242 if (flags & FLG_OF_SYMINFO) {
3240 3243 if ((ofl->ofl_ossyminfo = make_sym_sec(ofl,
3241 3244 MSG_ORIG(MSG_SCN_SUNWSYMINFO), SHT_SUNW_syminfo,
3242 3245 ld_targ.t_id.id_syminfo)) == (Os_desc *)S_ERROR)
3243 3246 return (S_ERROR);
3244 3247 }
3245 3248
3246 3249 if (flags & FLG_OF_COMREL) {
3247 3250 /*
3248 3251 * If -zcombreloc is enabled then all relocations (except for
3249 3252 * the PLT's) are coalesced into a single relocation section.
3250 3253 */
3251 3254 if (ofl->ofl_reloccnt) {
3252 3255 if (make_reloc(ofl, NULL) == S_ERROR)
3253 3256 return (S_ERROR);
3254 3257 }
3255 3258 } else {
3256 3259 Aliste idx1;
3257 3260
3258 3261 /*
3259 3262 * Create the required output relocation sections. Note, new
3260 3263 * sections may be added to the section list that is being
3261 3264 * traversed. These insertions can move the elements of the
3262 3265 * Alist such that a section descriptor is re-read. Recursion
3263 3266 * is prevented by maintaining a previous section pointer and
3264 3267 * insuring that this pointer isn't re-examined.
3265 3268 */
3266 3269 for (APLIST_TRAVERSE(ofl->ofl_segs, idx1, sgp)) {
3267 3270 Os_desc *osp, *posp = 0;
3268 3271 Aliste idx2;
3269 3272
3270 3273 for (APLIST_TRAVERSE(sgp->sg_osdescs, idx2, osp)) {
3271 3274 if ((osp != posp) && osp->os_szoutrels &&
3272 3275 (osp != ofl->ofl_osplt)) {
3273 3276 if (make_reloc(ofl, osp) == S_ERROR)
3274 3277 return (S_ERROR);
3275 3278 }
3276 3279 posp = osp;
3277 3280 }
3278 3281 }
3279 3282
3280 3283 /*
3281 3284 * If we're not building a combined relocation section, then
3282 3285 * build a .rel[a] section as required.
3283 3286 */
3284 3287 if (ofl->ofl_relocrelsz) {
3285 3288 if (make_reloc(ofl, NULL) == S_ERROR)
3286 3289 return (S_ERROR);
3287 3290 }
3288 3291 }
3289 3292
3290 3293 /*
3291 3294 * The PLT relocations are always in their own section, and we try to
3292 3295 * keep them at the end of the PLT table. We do this to keep the hot
3293 3296 * "data" PLT's at the head of the table nearer the .dynsym & .hash.
3294 3297 */
3295 3298 if (ofl->ofl_osplt && ofl->ofl_relocpltsz) {
3296 3299 if (make_reloc(ofl, ofl->ofl_osplt) == S_ERROR)
3297 3300 return (S_ERROR);
3298 3301 }
3299 3302
3300 3303 /*
3301 3304 * Finally build the symbol and section header sections.
3302 3305 */
3303 3306 if (flags & FLG_OF_DYNAMIC) {
3304 3307 if (make_dynamic(ofl) == S_ERROR)
3305 3308 return (S_ERROR);
3306 3309
3307 3310 /*
3308 3311 * A number of sections aren't necessary within a relocatable
3309 3312 * object, even if -dy has been used.
3310 3313 */
3311 3314 if (!(flags & FLG_OF_RELOBJ)) {
3312 3315 if (make_hash(ofl) == S_ERROR)
3313 3316 return (S_ERROR);
3314 3317 if (make_dynstr(ofl) == S_ERROR)
3315 3318 return (S_ERROR);
3316 3319 if (make_dynsym(ofl) == S_ERROR)
3317 3320 return (S_ERROR);
3318 3321 if (ld_unwind_make_hdr(ofl) == S_ERROR)
3319 3322 return (S_ERROR);
3320 3323 if (make_dynsort(ofl) == S_ERROR)
3321 3324 return (S_ERROR);
3322 3325 }
3323 3326 }
3324 3327
3325 3328 if (!(flags & FLG_OF_STRIP) || (flags & FLG_OF_RELOBJ) ||
3326 3329 ((flags & FLG_OF_STATIC) && ofl->ofl_osversym)) {
3327 3330 /*
3328 3331 * Do we need to make a SHT_SYMTAB_SHNDX section
3329 3332 * for the dynsym. If so - do it now.
3330 3333 */
3331 3334 if (ofl->ofl_osdynsym &&
3332 3335 ((ofl->ofl_shdrcnt + 3) >= SHN_LORESERVE)) {
3333 3336 if (make_dynsym_shndx(ofl) == S_ERROR)
3334 3337 return (S_ERROR);
3335 3338 }
3336 3339
3337 3340 if (make_strtab(ofl) == S_ERROR)
3338 3341 return (S_ERROR);
3339 3342 if (make_symtab(ofl) == S_ERROR)
3340 3343 return (S_ERROR);
3341 3344 } else {
3342 3345 /*
3343 3346 * Do we need to make a SHT_SYMTAB_SHNDX section
3344 3347 * for the dynsym. If so - do it now.
3345 3348 */
3346 3349 if (ofl->ofl_osdynsym &&
3347 3350 ((ofl->ofl_shdrcnt + 1) >= SHN_LORESERVE)) {
3348 3351 if (make_dynsym_shndx(ofl) == S_ERROR)
3349 3352 return (S_ERROR);
3350 3353 }
3351 3354 }
3352 3355
3353 3356 if (make_shstrtab(ofl) == S_ERROR)
3354 3357 return (S_ERROR);
3355 3358
3356 3359 /*
3357 3360 * Now that we've created all output sections, adjust the size of the
3358 3361 * SHT_SUNW_versym and SHT_SUNW_syminfo section, which are dependent on
3359 3362 * the associated symbol table sizes.
3360 3363 */
3361 3364 if (ofl->ofl_osversym || ofl->ofl_ossyminfo) {
3362 3365 ulong_t cnt;
3363 3366 Is_desc *isp;
3364 3367 Os_desc *osp;
3365 3368
3366 3369 if (OFL_IS_STATIC_OBJ(ofl))
3367 3370 osp = ofl->ofl_ossymtab;
3368 3371 else
3369 3372 osp = ofl->ofl_osdynsym;
3370 3373
3371 3374 isp = ld_os_first_isdesc(osp);
3372 3375 cnt = (isp->is_shdr->sh_size / isp->is_shdr->sh_entsize);
3373 3376
3374 3377 if (ofl->ofl_osversym)
3375 3378 update_data_size(ofl->ofl_osversym, cnt);
3376 3379
3377 3380 if (ofl->ofl_ossyminfo)
3378 3381 update_data_size(ofl->ofl_ossyminfo, cnt);
3379 3382 }
3380 3383
3381 3384 /*
3382 3385 * Now that we've created all output sections, adjust the size of the
3383 3386 * SHT_SUNW_capinfo, which is dependent on the associated symbol table
3384 3387 * size.
3385 3388 */
3386 3389 if (ofl->ofl_oscapinfo) {
3387 3390 ulong_t cnt;
3388 3391
3389 3392 /*
3390 3393 * Symbol capabilities symbols are placed directly after the
3391 3394 * STT_FILE symbol, section symbols, and any register symbols.
3392 3395 * Effectively these are the first of any series of demoted
3393 3396 * (scoped) symbols.
3394 3397 */
3395 3398 if (OFL_IS_STATIC_OBJ(ofl))
3396 3399 cnt = SYMTAB_ALL_CNT(ofl);
3397 3400 else
3398 3401 cnt = DYNSYM_ALL_CNT(ofl);
3399 3402
3400 3403 update_data_size(ofl->ofl_oscapinfo, cnt);
3401 3404 }
3402 3405 return (1);
3403 3406 }
3404 3407
3405 3408 /*
3406 3409 * Build an additional data section - used to back OBJT symbol definitions
3407 3410 * added with a mapfile.
3408 3411 */
3409 3412 Is_desc *
3410 3413 ld_make_data(Ofl_desc *ofl, size_t size)
3411 3414 {
3412 3415 Shdr *shdr;
3413 3416 Elf_Data *data;
3414 3417 Is_desc *isec;
3415 3418
3416 3419 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_DATA), 0,
3417 3420 &isec, &shdr, &data) == S_ERROR)
3418 3421 return ((Is_desc *)S_ERROR);
3419 3422
3420 3423 data->d_size = size;
3421 3424 shdr->sh_size = (Xword)size;
3422 3425 shdr->sh_flags |= SHF_WRITE;
3423 3426
3424 3427 if (aplist_append(&ofl->ofl_mapdata, isec, AL_CNT_OFL_MAPSECS) == NULL)
3425 3428 return ((Is_desc *)S_ERROR);
3426 3429
3427 3430 return (isec);
3428 3431 }
3429 3432
3430 3433 /*
3431 3434 * Build an additional text section - used to back FUNC symbol definitions
3432 3435 * added with a mapfile.
3433 3436 */
3434 3437 Is_desc *
3435 3438 ld_make_text(Ofl_desc *ofl, size_t size)
3436 3439 {
3437 3440 Shdr *shdr;
3438 3441 Elf_Data *data;
3439 3442 Is_desc *isec;
3440 3443
3441 3444 /*
3442 3445 * Insure the size is sufficient to contain the minimum return
3443 3446 * instruction.
3444 3447 */
3445 3448 if (size < ld_targ.t_nf.nf_size)
3446 3449 size = ld_targ.t_nf.nf_size;
3447 3450
3448 3451 if (new_section(ofl, SHT_PROGBITS, MSG_ORIG(MSG_SCN_TEXT), 0,
3449 3452 &isec, &shdr, &data) == S_ERROR)
3450 3453 return ((Is_desc *)S_ERROR);
3451 3454
3452 3455 data->d_size = size;
3453 3456 shdr->sh_size = (Xword)size;
3454 3457 shdr->sh_flags |= SHF_EXECINSTR;
3455 3458
3456 3459 /*
3457 3460 * Fill the buffer with the appropriate return instruction.
3458 3461 * Note that there is no need to swap bytes on a non-native,
3459 3462 * link, as the data being copied is given in bytes.
3460 3463 */
3461 3464 if ((data->d_buf = libld_calloc(size, 1)) == NULL)
3462 3465 return ((Is_desc *)S_ERROR);
3463 3466 (void) memcpy(data->d_buf, ld_targ.t_nf.nf_template,
3464 3467 ld_targ.t_nf.nf_size);
3465 3468
3466 3469 /*
3467 3470 * If size was larger than required, and the target supplies
3468 3471 * a fill function, use it to fill the balance. If there is no
3469 3472 * fill function, we accept the 0-fill supplied by libld_calloc().
3470 3473 */
3471 3474 if ((ld_targ.t_ff.ff_execfill != NULL) && (size > ld_targ.t_nf.nf_size))
3472 3475 ld_targ.t_ff.ff_execfill(data->d_buf, ld_targ.t_nf.nf_size,
3473 3476 size - ld_targ.t_nf.nf_size);
3474 3477
3475 3478 if (aplist_append(&ofl->ofl_maptext, isec, AL_CNT_OFL_MAPSECS) == NULL)
3476 3479 return ((Is_desc *)S_ERROR);
3477 3480
3478 3481 return (isec);
3479 3482 }
3480 3483
3481 3484 void
3482 3485 ld_comdat_validate(Ofl_desc *ofl, Ifl_desc *ifl)
3483 3486 {
3484 3487 int i;
3485 3488
3486 3489 for (i = 0; i < ifl->ifl_shnum; i++) {
3487 3490 Is_desc *isp = ifl->ifl_isdesc[i];
3488 3491 int types = 0;
3489 3492 char buf[1024] = "";
3490 3493 Group_desc *gr = NULL;
3491 3494
3492 3495 if ((isp == NULL) || (isp->is_flags & FLG_IS_COMDAT) == 0)
3493 3496 continue;
3494 3497
3495 3498 if (isp->is_shdr->sh_type == SHT_SUNW_COMDAT) {
3496 3499 types++;
3497 3500 (void) strlcpy(buf, MSG_ORIG(MSG_STR_SUNW_COMDAT),
3498 3501 sizeof (buf));
3499 3502 }
3500 3503
3501 3504 if (strncmp(MSG_ORIG(MSG_SCN_GNU_LINKONCE), isp->is_name,
3502 3505 MSG_SCN_GNU_LINKONCE_SIZE) == 0) {
3503 3506 types++;
3504 3507 if (types > 1)
3505 3508 (void) strlcat(buf, ", ", sizeof (buf));
3506 3509 (void) strlcat(buf, MSG_ORIG(MSG_SCN_GNU_LINKONCE),
3507 3510 sizeof (buf));
3508 3511 }
3509 3512
3510 3513 if ((isp->is_shdr->sh_flags & SHF_GROUP) &&
3511 3514 ((gr = ld_get_group(ofl, isp)) != NULL) &&
3512 3515 (gr->gd_data[0] & GRP_COMDAT)) {
3513 3516 types++;
3514 3517 if (types > 1)
3515 3518 (void) strlcat(buf, ", ", sizeof (buf));
3516 3519 (void) strlcat(buf, MSG_ORIG(MSG_STR_GROUP),
3517 3520 sizeof (buf));
3518 3521 }
3519 3522
3520 3523 if (types > 1)
3521 3524 ld_eprintf(ofl, ERR_FATAL,
3522 3525 MSG_INTL(MSG_SCN_MULTICOMDAT), ifl->ifl_name,
3523 3526 EC_WORD(isp->is_scnndx), isp->is_name, buf);
3524 3527 }
3525 3528 }
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