1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 1990, 1991 UNIX System Laboratories, Inc.
24 * Copyright (c) 1988 AT&T
25 * All Rights Reserved
26 *
27 * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
28 */
29
30 /* Get the x86 version of the relocation engine */
31 #define DO_RELOC_LIBLD_X86
32
33 #include <string.h>
34 #include <stdio.h>
35 #include <sys/elf_386.h>
36 #include <debug.h>
37 #include <reloc.h>
38 #include <i386/machdep_x86.h>
39 #include "msg.h"
40 #include "_libld.h"
41
42 /*
43 * Search the GOT index list for a GOT entry with a matching reference.
44 */
45 /* ARGSUSED3 */
46 static Gotndx *
47 ld_find_got_ndx(Alist *alp, Gotref gref, Ofl_desc *ofl, Rel_desc *rdesc)
48 {
49 Aliste idx;
50 Gotndx *gnp;
51
52 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx)
53 return (ofl->ofl_tlsldgotndx);
54
55 for (ALIST_TRAVERSE(alp, idx, gnp)) {
56 if (gnp->gn_gotref == gref)
57 return (gnp);
58 }
59 return (NULL);
60 }
61
62 static Xword
63 ld_calc_got_offset(Rel_desc *rdesc, Ofl_desc *ofl)
64 {
65 Os_desc *osp = ofl->ofl_osgot;
66 Sym_desc *sdp = rdesc->rel_sym;
67 Xword gotndx;
68 Gotref gref;
69 Gotndx *gnp;
70
71 if (rdesc->rel_flags & FLG_REL_DTLS)
72 gref = GOT_REF_TLSGD;
73 else if (rdesc->rel_flags & FLG_REL_MTLS)
74 gref = GOT_REF_TLSLD;
75 else if (rdesc->rel_flags & FLG_REL_STLS)
76 gref = GOT_REF_TLSIE;
77 else
78 gref = GOT_REF_GENERIC;
79
80 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL);
81 assert(gnp);
82
83 gotndx = (Xword)gnp->gn_gotndx;
84
85 if ((rdesc->rel_flags & FLG_REL_DTLS) &&
86 (rdesc->rel_rtype == R_386_TLS_DTPOFF32))
87 gotndx++;
88
89 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE)));
90 }
91
92 static Word
93 ld_init_rel(Rel_desc *reld, Word *typedata, void *reloc)
94 {
95 Rel *rel = (Rel *)reloc;
96
97 /* LINTED */
98 reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info, M_MACH);
99 reld->rel_roffset = rel->r_offset;
100 reld->rel_raddend = 0;
101 *typedata = 0;
102
103 return ((Word)ELF_R_SYM(rel->r_info));
104 }
105
106 static void
107 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl)
108 {
109 ofl->ofl_dehdr->e_flags |= ehdr->e_flags;
110 }
111
112 static void
113 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt)
114 {
115 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) {
116 /*
117 * Create this entry if we are going to create a PLT table.
118 */
119 if (ofl->ofl_pltcnt)
120 (*cnt)++; /* DT_PLTGOT */
121 }
122 }
123
124 static void
125 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn)
126 {
127 if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) {
128 (*dyn)->d_tag = DT_PLTGOT;
129 if (ofl->ofl_osgot)
130 (*dyn)->d_un.d_ptr = ofl->ofl_osgot->os_shdr->sh_addr;
131 else
132 (*dyn)->d_un.d_ptr = 0;
133 (*dyn)++;
134 }
135 }
136
137 static Xword
138 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl)
139 {
140 Xword value;
141
142 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) +
143 M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * M_PLT_ENTSIZE);
144 return (value);
145 }
146
147 /*
148 * Build a single plt entry - code is:
149 * if (building a.out)
150 * JMP *got_off
151 * else
152 * JMP *got_off@GOT(%ebx)
153 * PUSHL &rel_off
154 * JMP -n(%pc) # -n is pcrel offset to first plt entry
155 *
156 * The got_off@GOT entry gets filled with the address of the PUSHL,
157 * so the first pass through the plt jumps back here, jumping
158 * in turn to the first plt entry, which jumps to the dynamic
159 * linker. The dynamic linker then patches the GOT, rerouting
160 * future plt calls to the proper destination.
161 */
162 static void
163 plt_entry(Ofl_desc * ofl, Word rel_off, Sym_desc * sdp)
164 {
165 uchar_t *pltent, *gotent;
166 Sword plt_off;
167 Word got_off;
168 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0;
169
170 got_off = sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
171 plt_off = M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) *
172 M_PLT_ENTSIZE);
173 pltent = (uchar_t *)(ofl->ofl_osplt->os_outdata->d_buf) + plt_off;
174 gotent = (uchar_t *)(ofl->ofl_osgot->os_outdata->d_buf) + got_off;
175
176 /*
177 * Fill in the got entry with the address of the next instruction.
178 */
179 /* LINTED */
180 *(Word *)gotent = ofl->ofl_osplt->os_shdr->sh_addr + plt_off +
181 M_PLT_INSSIZE;
182 if (bswap)
183 /* LINTED */
184 *(Word *)gotent = ld_bswap_Word(*(Word *)gotent);
185
186 if (!(ofl->ofl_flags & FLG_OF_SHAROBJ)) {
187 pltent[0] = M_SPECIAL_INST;
188 pltent[1] = M_JMP_DISP_IND;
189 pltent += 2;
190 /* LINTED */
191 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->sh_addr +
192 got_off);
193 } else {
194 pltent[0] = M_SPECIAL_INST;
195 pltent[1] = M_JMP_REG_DISP_IND;
196 pltent += 2;
197 /* LINTED */
198 *(Word *)pltent = (Word)got_off;
199 }
200 if (bswap)
201 /* LINTED */
202 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent);
203 pltent += 4;
204
205 pltent[0] = M_INST_PUSHL;
206 pltent++;
207 /* LINTED */
208 *(Word *)pltent = (Word)rel_off;
209 if (bswap)
210 /* LINTED */
211 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent);
212 pltent += 4;
213
214 plt_off = -(plt_off + 16); /* JMP, PUSHL, JMP take 16 bytes */
215 pltent[0] = M_INST_JMP;
216 pltent++;
217 /* LINTED */
218 *(Word *)pltent = (Word)plt_off;
219 if (bswap)
220 /* LINTED */
221 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent);
222 }
223
224 static uintptr_t
225 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl, Boolean *remain_seen)
226 {
227 Os_desc * relosp, * osp = 0;
228 Word ndx, roffset, value;
229 Rel rea;
230 char *relbits;
231 Sym_desc * sdp, * psym = (Sym_desc *)0;
232 int sectmoved = 0;
233
234 sdp = orsp->rel_sym;
235
236 /*
237 * If the section this relocation is against has been discarded
238 * (-zignore), then also discard (skip) the relocation itself.
239 */
240 if (orsp->rel_isdesc && ((orsp->rel_flags &
241 (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) &&
242 (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) {
243 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp));
244 return (1);
245 }
246
247 /*
248 * If this is a relocation against a move table, or expanded move
249 * table, adjust the relocation entries.
250 */
251 if (RELAUX_GET_MOVE(orsp))
252 ld_adj_movereloc(ofl, orsp);
253
254 /*
255 * If this is a relocation against a section using a partial initialized
256 * symbol, adjust the embedded symbol info.
257 *
258 * The second argument of the am_I_partial() is the value stored at the
259 * target address relocation is going to be applied.
260 */
261 if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) {
262 if (ofl->ofl_parsyms &&
263 (sdp->sd_isc->is_flags & FLG_IS_RELUPD) &&
264 /* LINTED */
265 (psym = ld_am_I_partial(orsp, *(Xword *)
266 ((uchar_t *)(orsp->rel_isdesc->is_indata->d_buf) +
267 orsp->rel_roffset)))) {
268 DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym));
269 sectmoved = 1;
270 }
271 }
272
273 value = sdp->sd_sym->st_value;
274
275 if (orsp->rel_flags & FLG_REL_GOT) {
276 osp = ofl->ofl_osgot;
277 roffset = (Word)ld_calc_got_offset(orsp, ofl);
278
279 } else if (orsp->rel_flags & FLG_REL_PLT) {
280 /*
281 * Note that relocations for PLT's actually
282 * cause a relocation againt the GOT.
283 */
284 osp = ofl->ofl_osplt;
285 roffset = (Word) (ofl->ofl_osgot->os_shdr->sh_addr) +
286 sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
287
288 plt_entry(ofl, osp->os_relosdesc->os_szoutrels, sdp);
289
290 } else if (orsp->rel_flags & FLG_REL_BSS) {
291 /*
292 * This must be a R_386_COPY. For these set the roffset to
293 * point to the new symbols location.
294 */
295 osp = ofl->ofl_isbss->is_osdesc;
296 roffset = (Word)value;
297 } else {
298 osp = RELAUX_GET_OSDESC(orsp);
299
300 /*
301 * Calculate virtual offset of reference point; equals offset
302 * into section + vaddr of section for loadable sections, or
303 * offset plus section displacement for nonloadable sections.
304 */
305 roffset = orsp->rel_roffset +
306 (Off)_elf_getxoff(orsp->rel_isdesc->is_indata);
307 if (!(ofl->ofl_flags & FLG_OF_RELOBJ))
308 roffset += orsp->rel_isdesc->is_osdesc->
309 os_shdr->sh_addr;
310 }
311
312 if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0))
313 relosp = ofl->ofl_osrel;
314
315 /*
316 * Assign the symbols index for the output relocation. If the
317 * relocation refers to a SECTION symbol then it's index is based upon
318 * the output sections symbols index. Otherwise the index can be
319 * derived from the symbols index itself.
320 */
321 if (orsp->rel_rtype == R_386_RELATIVE)
322 ndx = STN_UNDEF;
323 else if ((orsp->rel_flags & FLG_REL_SCNNDX) ||
324 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) {
325 if (sectmoved == 0) {
326 /*
327 * Check for a null input section. This can
328 * occur if this relocation references a symbol
329 * generated by sym_add_sym().
330 */
331 if (sdp->sd_isc && sdp->sd_isc->is_osdesc)
332 ndx = sdp->sd_isc->is_osdesc->os_identndx;
333 else
334 ndx = sdp->sd_shndx;
335 } else
336 ndx = ofl->ofl_parexpnndx;
337 } else
338 ndx = sdp->sd_symndx;
339
340 /*
341 * If we have a replacement value for the relocation
342 * target, put it in place now.
343 */
344 if (orsp->rel_flags & FLG_REL_NADDEND) {
345 Xword addend = orsp->rel_raddend;
346 uchar_t *addr;
347
348 /*
349 * Get the address of the data item we need to modify.
350 */
351 addr = (uchar_t *)((uintptr_t)orsp->rel_roffset +
352 (uintptr_t)_elf_getxoff(orsp->rel_isdesc->is_indata));
353 addr += (uintptr_t)RELAUX_GET_OSDESC(orsp)->os_outdata->d_buf;
354 if (ld_reloc_targval_set(ofl, orsp, addr, addend) == 0)
355 return (S_ERROR);
356 }
357
358 relbits = (char *)relosp->os_outdata->d_buf;
359
360 rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype);
361 rea.r_offset = roffset;
362 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_REL, &rea, relosp->os_name,
363 ld_reloc_sym_name(orsp)));
364
365 /*
366 * Assert we haven't walked off the end of our relocation table.
367 */
368 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size);
369
370 (void) memcpy((relbits + relosp->os_szoutrels),
371 (char *)&rea, sizeof (Rel));
372 relosp->os_szoutrels += sizeof (Rel);
373
374 /*
375 * Determine if this relocation is against a non-writable, allocatable
376 * section. If so we may need to provide a text relocation diagnostic.
377 * Note that relocations against the .plt (R_386_JMP_SLOT) actually
378 * result in modifications to the .got.
379 */
380 if (orsp->rel_rtype == R_386_JMP_SLOT)
381 osp = ofl->ofl_osgot;
382
383 ld_reloc_remain_entry(orsp, osp, ofl, remain_seen);
384 return (1);
385 }
386
387 /*
388 * i386 Instructions for TLS processing
389 */
390 static uchar_t tlsinstr_gd_ie[] = {
391 /*
392 * 0x00 movl %gs:0x0, %eax
393 */
394 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00,
395 /*
396 * 0x06 addl x(%eax), %eax
397 * 0x0c ...
398 */
399 0x03, 0x80, 0x00, 0x00, 0x00, 0x00
400 };
401
402 static uchar_t tlsinstr_gd_le[] = {
403 /*
404 * 0x00 movl %gs:0x0, %eax
405 */
406 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00,
407 /*
408 * 0x06 addl $0x0, %eax
409 */
410 0x05, 0x00, 0x00, 0x00, 0x00,
411 /*
412 * 0x0b nop
413 * 0x0c
414 */
415 0x90
416 };
417
418 static uchar_t tlsinstr_ld_le_movgs[] = {
419 /*
420 * 0x00 movl %gs:0x0,%eax
421 */
422 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00,
423 };
424
425 /*
426 * 0x00 nopl 0(%eax,%eax) -- the intel recommended 5-byte nop
427 * See Intel® 64 and IA-32 Architectures Software Developer’s Manual
428 * Volume 2B: Instruction Set Reference, M-U
429 * Table 4-12, Recommended Multi-Byte Sequence of NOP Instruction
430 */
431 static uchar_t tlsinstr_nop5[] = {
432
433 0x0f, 0x1f, 0x44, 0x00, 0x00
434 };
435
436 #define TLS_GD_IE_MOV 0x8b /* movl opcode */
437 #define TLS_GD_IE_POP 0x58 /* popl + reg */
438
439 #define TLS_GD_LE_MOVL 0xb8 /* movl + reg */
440
441 #define TLS_NOP 0x90 /* NOP instruction */
442
443 #define MODRM_MSK_MOD 0xc0
444 #define MODRM_MSK_RO 0x38
445 #define MODRM_MSK_RM 0x07
446
447 #define SIB_MSK_SS 0xc0
448 #define SIB_MSK_IND 0x38
449 #define SIB_MSK_BS 0x07
450
451 static Fixupret
452 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp)
453 {
454 Sym_desc *sdp = arsp->rel_sym;
455 Word rtype = arsp->rel_rtype;
456 uchar_t *offset, r1, r2;
457
458 offset = (uchar_t *)((uintptr_t)arsp->rel_roffset +
459 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) +
460 (uintptr_t)RELAUX_GET_OSDESC(arsp)->os_outdata->d_buf);
461
462 if (sdp->sd_ref == REF_DYN_NEED) {
463 /*
464 * IE reference model
465 */
466 switch (rtype) {
467 case R_386_TLS_GD:
468 /*
469 * Transition:
470 * 0x0 leal x@tlsgd(,r1,1), %eax
471 * 0x7 call ___tls_get_addr
472 * 0xc
473 * To:
474 * 0x0 movl %gs:0, %eax
475 * 0x6 addl x@gotntpoff(r1), %eax
476 */
477 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
478 R_386_TLS_GOTIE, arsp, ld_reloc_sym_name));
479 arsp->rel_rtype = R_386_TLS_GOTIE;
480 arsp->rel_roffset += 5;
481
482 /*
483 * Adjust 'offset' to beginning of instruction
484 * sequence.
485 */
486 offset -= 3;
487 r1 = (offset[2] & SIB_MSK_IND) >> 3;
488 (void) memcpy(offset, tlsinstr_gd_ie,
489 sizeof (tlsinstr_gd_ie));
490
491 /*
492 * set register %r1 into the addl
493 * instruction.
494 */
495 offset[0x7] |= r1;
496 return (FIX_RELOC);
497
498 case R_386_TLS_GD_PLT:
499 /*
500 * Fixup done via the TLS_GD relocation
501 */
502 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
503 R_386_NONE, arsp, ld_reloc_sym_name));
504 return (FIX_DONE);
505 }
506 }
507
508 /*
509 * LE reference model
510 */
511 switch (rtype) {
512 case R_386_TLS_GD:
513 /*
514 * Transition:
515 * 0x0 leal x@tlsgd(,r1,1), %eax
516 * 0x7 call ___tls_get_addr
517 * 0xc
518 * To:
519 * 0x0 movl %gs:0, %eax
520 * 0x6 addl $x@ntpoff, %eax
521 * 0xb nop
522 * 0xc
523 */
524 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
525 R_386_TLS_LE, arsp, ld_reloc_sym_name));
526
527 arsp->rel_rtype = R_386_TLS_LE;
528 arsp->rel_roffset += 4;
529
530 /*
531 * Adjust 'offset' to beginning of instruction
532 * sequence.
533 */
534 offset -= 3;
535 (void) memcpy(offset, tlsinstr_gd_le,
536 sizeof (tlsinstr_gd_le));
537 return (FIX_RELOC);
538
539 case R_386_TLS_GD_PLT:
540 case R_386_PLT32:
541 /*
542 * Fixup done via the TLS_GD/TLS_LDM relocation processing
543 * and ld_reloc_plt() handling __tls_get_addr().
544 */
545 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
546 R_386_NONE, arsp, ld_reloc_sym_name));
547 return (FIX_DONE);
548
549 case R_386_TLS_LDM_PLT:
550 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
551 R_386_NONE, arsp, ld_reloc_sym_name));
552
553 /*
554 * Transition:
555 * call __tls_get_addr()
556 * to:
557 * nopl 0x0(%eax,%eax)
558 */
559 (void) memcpy(offset - 1, tlsinstr_nop5,
560 sizeof (tlsinstr_nop5));
561 return (FIX_DONE);
562
563 case R_386_TLS_LDM:
564 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
565 R_386_NONE, arsp, ld_reloc_sym_name));
566
567 /*
568 * Transition:
569 *
570 * 0x00 leal x1@tlsldm(%ebx), %eax
571 * 0x06 call ___tls_get_addr
572 *
573 * to:
574 *
575 * 0x00 movl %gs:0, %eax
576 */
577 (void) memcpy(offset - 2, tlsinstr_ld_le_movgs,
578 sizeof (tlsinstr_ld_le_movgs));
579
580 /*
581 * We implicitly treat this as if a R_386_TLS_LDM_PLT for the
582 * __tls_get_addr call followed it as the GNU compiler
583 * doesn't generate one. This is safe, because if one _does_
584 * exist we'll just write the nop again.
585 */
586 (void) memcpy(offset + 4, tlsinstr_nop5,
587 sizeof (tlsinstr_nop5));
588 return (FIX_DONE);
589
590 case R_386_TLS_LDO_32:
591 /*
592 * Instructions:
593 *
594 * 0x10 leal x1@dtpoff(%eax), %edx R_386_TLS_LDO_32
595 * to
596 * 0x10 leal x1@ntpoff(%eax), %edx R_386_TLS_LE
597 *
598 */
599 offset -= 2;
600
601 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
602 R_386_TLS_LE, arsp, ld_reloc_sym_name));
603 arsp->rel_rtype = R_386_TLS_LE;
604 return (FIX_RELOC);
605
606 case R_386_TLS_GOTIE:
607 /*
608 * These transitions are a little different than the
609 * others, in that we could have multiple instructions
610 * pointed to by a single relocation. Depending upon the
611 * instruction, we perform a different code transition.
612 *
613 * Here's the known transitions:
614 *
615 * 1) movl foo@gotntpoff(%reg1), %reg2
616 * 0x8b, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff
617 *
618 * 2) addl foo@gotntpoff(%reg1), %reg2
619 * 0x03, 0x80 | (reg2 << 3) | reg1, foo@gotntpoff
620 *
621 * Transitions IE -> LE
622 *
623 * 1) movl $foo@ntpoff, %reg2
624 * 0xc7, 0xc0 | reg2, foo@ntpoff
625 *
626 * 2) addl $foo@ntpoff, %reg2
627 * 0x81, 0xc0 | reg2, foo@ntpoff
628 *
629 * Note: reg1 != 4 (%esp)
630 */
631 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
632 R_386_TLS_LE, arsp, ld_reloc_sym_name));
633 arsp->rel_rtype = R_386_TLS_LE;
634
635 offset -= 2;
636 r2 = (offset[1] & MODRM_MSK_RO) >> 3;
637 if (offset[0] == 0x8b) {
638 /* case 1 above */
639 offset[0] = 0xc7; /* movl */
640 offset[1] = 0xc0 | r2;
641 return (FIX_RELOC);
642 }
643
644 if (offset[0] == 0x03) {
645 /* case 2 above */
646 assert(offset[0] == 0x03);
647 offset[0] = 0x81; /* addl */
648 offset[1] = 0xc0 | r2;
649 return (FIX_RELOC);
650 }
651
652 /*
653 * Unexpected instruction sequence - fatal error.
654 */
655 {
656 Conv_inv_buf_t inv_buf;
657
658 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS),
659 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf),
660 arsp->rel_isdesc->is_file->ifl_name,
661 ld_reloc_sym_name(arsp),
662 arsp->rel_isdesc->is_name,
663 EC_OFF(arsp->rel_roffset));
664 }
665 return (FIX_ERROR);
666
667 case R_386_TLS_IE:
668 /*
669 * These transitions are a little different than the
670 * others, in that we could have multiple instructions
671 * pointed to by a single relocation. Depending upon the
672 * instruction, we perform a different code transition.
673 *
674 * Here's the known transitions:
675 * 1) movl foo@indntpoff, %eax
676 * 0xa1, foo@indntpoff
677 *
678 * 2) movl foo@indntpoff, %eax
679 * 0x8b, 0x05 | (reg << 3), foo@gotntpoff
680 *
681 * 3) addl foo@indntpoff, %eax
682 * 0x03, 0x05 | (reg << 3), foo@gotntpoff
683 *
684 * Transitions IE -> LE
685 *
686 * 1) movl $foo@ntpoff, %eax
687 * 0xb8, foo@ntpoff
688 *
689 * 2) movl $foo@ntpoff, %reg
690 * 0xc7, 0xc0 | reg, foo@ntpoff
691 *
692 * 3) addl $foo@ntpoff, %reg
693 * 0x81, 0xc0 | reg, foo@ntpoff
694 */
695 arsp->rel_rtype = R_386_TLS_LE;
696 offset--;
697 if (offset[0] == 0xa1) {
698 /* case 1 above */
699 offset[0] = 0xb8; /* movl */
700 return (FIX_RELOC);
701 }
702
703 offset--;
704 if (offset[0] == 0x8b) {
705 /* case 2 above */
706 r2 = (offset[1] & MODRM_MSK_RO) >> 3;
707 offset[0] = 0xc7; /* movl */
708 offset[1] = 0xc0 | r2;
709 return (FIX_RELOC);
710 }
711 if (offset[0] == 0x03) {
712 /* case 3 above */
713 r2 = (offset[1] & MODRM_MSK_RO) >> 3;
714 offset[0] = 0x81; /* addl */
715 offset[1] = 0xc0 | r2;
716 return (FIX_RELOC);
717 }
718 /*
719 * Unexpected instruction sequence - fatal error.
720 */
721 {
722 Conv_inv_buf_t inv_buf;
723
724 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS),
725 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf),
726 arsp->rel_isdesc->is_file->ifl_name,
727 ld_reloc_sym_name(arsp),
728 arsp->rel_isdesc->is_name,
729 EC_OFF(arsp->rel_roffset));
730 }
731 return (FIX_ERROR);
732 }
733 return (FIX_RELOC);
734 }
735
736 static uintptr_t
737 ld_do_activerelocs(Ofl_desc *ofl)
738 {
739 Rel_desc *arsp;
740 Rel_cachebuf *rcbp;
741 Aliste idx;
742 uintptr_t return_code = 1;
743 ofl_flag_t flags = ofl->ofl_flags;
744
745 if (aplist_nitems(ofl->ofl_actrels.rc_list) != 0)
746 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml));
747
748 /*
749 * Process active relocations.
750 */
751 REL_CACHE_TRAVERSE(&ofl->ofl_actrels, idx, rcbp, arsp) {
752 uchar_t *addr;
753 Xword value;
754 Sym_desc *sdp;
755 const char *ifl_name;
756 Xword refaddr;
757 int moved = 0;
758 Gotref gref;
759 Os_desc *osp;
760
761 /*
762 * If the section this relocation is against has been discarded
763 * (-zignore), then discard (skip) the relocation itself.
764 */
765 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) &&
766 ((arsp->rel_flags & (FLG_REL_GOT | FLG_REL_BSS |
767 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) {
768 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, arsp));
769 continue;
770 }
771
772 /*
773 * We determine what the 'got reference' model (if required)
774 * is at this point. This needs to be done before tls_fixup()
775 * since it may 'transition' our instructions.
776 *
777 * The got table entries have already been assigned,
778 * and we bind to those initial entries.
779 */
780 if (arsp->rel_flags & FLG_REL_DTLS)
781 gref = GOT_REF_TLSGD;
782 else if (arsp->rel_flags & FLG_REL_MTLS)
783 gref = GOT_REF_TLSLD;
784 else if (arsp->rel_flags & FLG_REL_STLS)
785 gref = GOT_REF_TLSIE;
786 else
787 gref = GOT_REF_GENERIC;
788
789 /*
790 * Perform any required TLS fixups.
791 */
792 if (arsp->rel_flags & FLG_REL_TLSFIX) {
793 Fixupret ret;
794
795 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR)
796 return (S_ERROR);
797 if (ret == FIX_DONE)
798 continue;
799 }
800
801 /*
802 * If this is a relocation against a move table, or
803 * expanded move table, adjust the relocation entries.
804 */
805 if (RELAUX_GET_MOVE(arsp))
806 ld_adj_movereloc(ofl, arsp);
807
808 sdp = arsp->rel_sym;
809 refaddr = arsp->rel_roffset +
810 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata);
811
812 if (arsp->rel_flags & FLG_REL_CLVAL)
813 value = 0;
814 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) {
815 /*
816 * The value for a symbol pointing to a SECTION
817 * is based off of that sections position.
818 */
819 if (sdp->sd_isc->is_flags & FLG_IS_RELUPD) {
820 Sym_desc *sym;
821 Xword radd;
822 uchar_t *raddr = (uchar_t *)
823 arsp->rel_isdesc->is_indata->d_buf +
824 arsp->rel_roffset;
825
826 /*
827 * This is a REL platform. Hence, the second
828 * argument of ld_am_I_partial() is the value
829 * stored at the target address where the
830 * relocation is going to be applied.
831 */
832 if (ld_reloc_targval_get(ofl, arsp, raddr,
833 &radd) == 0)
834 return (S_ERROR);
835 sym = ld_am_I_partial(arsp, radd);
836 if (sym) {
837 Sym *osym = sym->sd_osym;
838
839 /*
840 * The symbol was moved, so adjust the
841 * value relative to the new section.
842 */
843 value = sym->sd_sym->st_value;
844 moved = 1;
845
846 /*
847 * The original raddend covers the
848 * displacement from the section start
849 * to the desired address. The value
850 * computed above gets us from the
851 * section start to the start of the
852 * symbol range. Adjust the old raddend
853 * to remove the offset from section
854 * start to symbol start, leaving the
855 * displacement within the range of
856 * the symbol.
857 */
858 if (osym->st_value != 0) {
859 radd -= osym->st_value;
860 if (ld_reloc_targval_set(ofl,
861 arsp, raddr, radd) == 0)
862 return (S_ERROR);
863 }
864 }
865 }
866 if (!moved) {
867 value = _elf_getxoff(sdp->sd_isc->is_indata);
868 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC)
869 value += sdp->sd_isc->
870 is_osdesc->os_shdr->sh_addr;
871 }
872 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS)
873 value -= ofl->ofl_tlsphdr->p_vaddr;
874
875 } else if (IS_SIZE(arsp->rel_rtype)) {
876 /*
877 * Size relocations require the symbols size.
878 */
879 value = sdp->sd_sym->st_size;
880
881 } else if ((sdp->sd_flags & FLG_SY_CAP) &&
882 sdp->sd_aux && sdp->sd_aux->sa_PLTndx) {
883 /*
884 * If relocation is against a capabilities symbol, we
885 * need to jump to an associated PLT, so that at runtime
886 * ld.so.1 is involved to determine the best binding
887 * choice. Otherwise, the value is the symbols value.
888 */
889 value = ld_calc_plt_addr(sdp, ofl);
890
891 } else
892 value = sdp->sd_sym->st_value;
893
894 /*
895 * Relocation against the GLOBAL_OFFSET_TABLE.
896 */
897 if ((arsp->rel_flags & FLG_REL_GOT) &&
898 !ld_reloc_set_aux_osdesc(ofl, arsp, ofl->ofl_osgot))
899 return (S_ERROR);
900 osp = RELAUX_GET_OSDESC(arsp);
901
902 /*
903 * If loadable and not producing a relocatable object add the
904 * sections virtual address to the reference address.
905 */
906 if ((arsp->rel_flags & FLG_REL_LOAD) &&
907 ((flags & FLG_OF_RELOBJ) == 0))
908 refaddr +=
909 arsp->rel_isdesc->is_osdesc->os_shdr->sh_addr;
910
911 /*
912 * If this entry has a PLT assigned to it, its value is actually
913 * the address of the PLT (and not the address of the function).
914 */
915 if (IS_PLT(arsp->rel_rtype)) {
916 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx)
917 value = ld_calc_plt_addr(sdp, ofl);
918 }
919
920 /*
921 * Determine whether the value needs further adjustment. Filter
922 * through the attributes of the relocation to determine what
923 * adjustment is required. Note, many of the following cases
924 * are only applicable when a .got is present. As a .got is
925 * not generated when a relocatable object is being built,
926 * any adjustments that require a .got need to be skipped.
927 */
928 if ((arsp->rel_flags & FLG_REL_GOT) &&
929 ((flags & FLG_OF_RELOBJ) == 0)) {
930 Xword R1addr;
931 uintptr_t R2addr;
932 Word gotndx;
933 Gotndx *gnp;
934
935 /*
936 * Perform relocation against GOT table. Since this
937 * doesn't fit exactly into a relocation we place the
938 * appropriate byte in the GOT directly
939 *
940 * Calculate offset into GOT at which to apply
941 * the relocation.
942 */
943 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL);
944 assert(gnp);
945
946 if (arsp->rel_rtype == R_386_TLS_DTPOFF32)
947 gotndx = gnp->gn_gotndx + 1;
948 else
949 gotndx = gnp->gn_gotndx;
950
951 R1addr = (Xword)(gotndx * M_GOT_ENTSIZE);
952
953 /*
954 * Add the GOTs data's offset.
955 */
956 R2addr = R1addr + (uintptr_t)osp->os_outdata->d_buf;
957
958 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT,
959 M_MACH, SHT_REL, arsp, R1addr, value,
960 ld_reloc_sym_name));
961
962 /*
963 * And do it.
964 */
965 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF)
966 *(Xword *)R2addr = ld_bswap_Xword(value);
967 else
968 *(Xword *)R2addr = value;
969 continue;
970
971 } else if (IS_GOT_BASED(arsp->rel_rtype) &&
972 ((flags & FLG_OF_RELOBJ) == 0)) {
973 value -= ofl->ofl_osgot->os_shdr->sh_addr;
974
975 } else if (IS_GOT_PC(arsp->rel_rtype) &&
976 ((flags & FLG_OF_RELOBJ) == 0)) {
977 value = (Xword)(ofl->ofl_osgot->os_shdr->sh_addr) -
978 refaddr;
979
980 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) &&
981 (((flags & FLG_OF_RELOBJ) == 0) ||
982 (osp == sdp->sd_isc->is_osdesc))) {
983 value -= refaddr;
984
985 } else if (IS_TLS_INS(arsp->rel_rtype) &&
986 IS_GOT_RELATIVE(arsp->rel_rtype) &&
987 ((flags & FLG_OF_RELOBJ) == 0)) {
988 Gotndx *gnp;
989
990 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, NULL);
991 assert(gnp);
992 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
993 if (arsp->rel_rtype == R_386_TLS_IE) {
994 value += ofl->ofl_osgot->os_shdr->sh_addr;
995 }
996
997 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) &&
998 ((flags & FLG_OF_RELOBJ) == 0)) {
999 Gotndx *gnp;
1000
1001 gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1002 GOT_REF_GENERIC, ofl, NULL);
1003 assert(gnp);
1004 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
1005
1006 } else if ((arsp->rel_flags & FLG_REL_STLS) &&
1007 ((flags & FLG_OF_RELOBJ) == 0)) {
1008 Xword tlsstatsize;
1009
1010 /*
1011 * This is the LE TLS reference model. Static
1012 * offset is hard-coded.
1013 */
1014 tlsstatsize = S_ROUND(ofl->ofl_tlsphdr->p_memsz,
1015 M_TLSSTATALIGN);
1016 value = tlsstatsize - value;
1017
1018 /*
1019 * Since this code is fixed up, it assumes a
1020 * negative offset that can be added to the
1021 * thread pointer.
1022 */
1023 if ((arsp->rel_rtype == R_386_TLS_LDO_32) ||
1024 (arsp->rel_rtype == R_386_TLS_LE))
1025 value = -value;
1026 }
1027
1028 if (arsp->rel_isdesc->is_file)
1029 ifl_name = arsp->rel_isdesc->is_file->ifl_name;
1030 else
1031 ifl_name = MSG_INTL(MSG_STR_NULL);
1032
1033 /*
1034 * Make sure we have data to relocate. Compiler and assembler
1035 * developers have been known to generate relocations against
1036 * invalid sections (normally .bss), so for their benefit give
1037 * them sufficient information to help analyze the problem.
1038 * End users should never see this.
1039 */
1040 if (arsp->rel_isdesc->is_indata->d_buf == 0) {
1041 Conv_inv_buf_t inv_buf;
1042
1043 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_EMPTYSEC),
1044 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf),
1045 ifl_name, ld_reloc_sym_name(arsp),
1046 EC_WORD(arsp->rel_isdesc->is_scnndx),
1047 arsp->rel_isdesc->is_name);
1048 return (S_ERROR);
1049 }
1050
1051 /*
1052 * Get the address of the data item we need to modify.
1053 */
1054 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset +
1055 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata));
1056
1057 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT,
1058 M_MACH, SHT_REL, arsp, EC_NATPTR(addr), value,
1059 ld_reloc_sym_name));
1060 addr += (uintptr_t)osp->os_outdata->d_buf;
1061
1062 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) >
1063 ofl->ofl_size) || (arsp->rel_roffset >
1064 osp->os_shdr->sh_size)) {
1065 Conv_inv_buf_t inv_buf;
1066 int class;
1067
1068 if (((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) >
1069 ofl->ofl_size)
1070 class = ERR_FATAL;
1071 else
1072 class = ERR_WARNING;
1073
1074 ld_eprintf(ofl, class, MSG_INTL(MSG_REL_INVALOFFSET),
1075 conv_reloc_386_type(arsp->rel_rtype, 0, &inv_buf),
1076 ifl_name, EC_WORD(arsp->rel_isdesc->is_scnndx),
1077 arsp->rel_isdesc->is_name, ld_reloc_sym_name(arsp),
1078 EC_ADDR((uintptr_t)addr -
1079 (uintptr_t)ofl->ofl_nehdr));
1080
1081 if (class == ERR_FATAL) {
1082 return_code = S_ERROR;
1083 continue;
1084 }
1085 }
1086
1087 /*
1088 * The relocation is additive. Ignore the previous symbol
1089 * value if this local partial symbol is expanded.
1090 */
1091 if (moved)
1092 value -= *addr;
1093
1094 /*
1095 * If we have a replacement value for the relocation
1096 * target, put it in place now.
1097 */
1098 if (arsp->rel_flags & FLG_REL_NADDEND) {
1099 Xword addend = arsp->rel_raddend;
1100
1101 if (ld_reloc_targval_set(ofl, arsp, addr, addend) == 0)
1102 return (S_ERROR);
1103 }
1104
1105 /*
1106 * If '-z noreloc' is specified - skip the do_reloc_ld stage.
1107 */
1108 if (OFL_DO_RELOC(ofl)) {
1109 if (do_reloc_ld(arsp, addr, &value, ld_reloc_sym_name,
1110 ifl_name, OFL_SWAP_RELOC_DATA(ofl, arsp),
1111 ofl->ofl_lml) == 0) {
1112 ofl->ofl_flags |= FLG_OF_FATAL;
1113 return_code = S_ERROR;
1114 }
1115 }
1116 }
1117 return (return_code);
1118 }
1119
1120 /*
1121 * Add an output relocation record.
1122 */
1123 static uintptr_t
1124 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl)
1125 {
1126 Rel_desc *orsp;
1127 Sym_desc *sdp = rsp->rel_sym;
1128
1129 /*
1130 * Static executables *do not* want any relocations against them.
1131 * Since our engine still creates relocations against a WEAK UNDEFINED
1132 * symbol in a static executable, it's best to disable them here
1133 * instead of through out the relocation code.
1134 */
1135 if (OFL_IS_STATIC_EXEC(ofl))
1136 return (1);
1137
1138 /*
1139 * If we are adding a output relocation against a section
1140 * symbol (non-RELATIVE) then mark that section. These sections
1141 * will be added to the .dynsym symbol table.
1142 */
1143 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) &&
1144 ((flags & FLG_REL_SCNNDX) ||
1145 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) {
1146
1147 /*
1148 * If this is a COMMON symbol - no output section
1149 * exists yet - (it's created as part of sym_validate()).
1150 * So - we mark here that when it's created it should
1151 * be tagged with the FLG_OS_OUTREL flag.
1152 */
1153 if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
1154 (sdp->sd_sym->st_shndx == SHN_COMMON)) {
1155 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS)
1156 ofl->ofl_flags1 |= FLG_OF1_BSSOREL;
1157 else
1158 ofl->ofl_flags1 |= FLG_OF1_TLSOREL;
1159 } else {
1160 Os_desc *osp;
1161 Is_desc *isp = sdp->sd_isc;
1162
1163 if (isp && ((osp = isp->is_osdesc) != NULL) &&
1164 ((osp->os_flags & FLG_OS_OUTREL) == 0)) {
1165 ofl->ofl_dynshdrcnt++;
1166 osp->os_flags |= FLG_OS_OUTREL;
1167 }
1168 }
1169 }
1170
1171 /* Enter it into the output relocation cache */
1172 if ((orsp = ld_reloc_enter(ofl, &ofl->ofl_outrels, rsp, flags)) == NULL)
1173 return (S_ERROR);
1174
1175 if (flags & FLG_REL_GOT)
1176 ofl->ofl_relocgotsz += (Xword)sizeof (Rel);
1177 else if (flags & FLG_REL_PLT)
1178 ofl->ofl_relocpltsz += (Xword)sizeof (Rel);
1179 else if (flags & FLG_REL_BSS)
1180 ofl->ofl_relocbsssz += (Xword)sizeof (Rel);
1181 else if (flags & FLG_REL_NOINFO)
1182 ofl->ofl_relocrelsz += (Xword)sizeof (Rel);
1183 else
1184 RELAUX_GET_OSDESC(orsp)->os_szoutrels += (Xword)sizeof (Rel);
1185
1186 if (orsp->rel_rtype == M_R_RELATIVE)
1187 ofl->ofl_relocrelcnt++;
1188
1189 /*
1190 * We don't perform sorting on PLT relocations because
1191 * they have already been assigned a PLT index and if we
1192 * were to sort them we would have to re-assign the plt indexes.
1193 */
1194 if (!(flags & FLG_REL_PLT))
1195 ofl->ofl_reloccnt++;
1196
1197 /*
1198 * Insure a GLOBAL_OFFSET_TABLE is generated if required.
1199 */
1200 if (IS_GOT_REQUIRED(orsp->rel_rtype))
1201 ofl->ofl_flags |= FLG_OF_BLDGOT;
1202
1203 /*
1204 * Identify and possibly warn of a displacement relocation.
1205 */
1206 if (orsp->rel_flags & FLG_REL_DISP) {
1207 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND;
1208
1209 if (ofl->ofl_flags & FLG_OF_VERBOSE)
1210 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl);
1211 }
1212 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_REL,
1213 M_MACH, orsp));
1214 return (1);
1215 }
1216
1217 /*
1218 * process relocation for a LOCAL symbol
1219 */
1220 static uintptr_t
1221 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl)
1222 {
1223 ofl_flag_t flags = ofl->ofl_flags;
1224 Sym_desc *sdp = rsp->rel_sym;
1225 Word shndx = sdp->sd_sym->st_shndx;
1226
1227 /*
1228 * if ((shared object) and (not pc relative relocation) and
1229 * (not against ABS symbol))
1230 * then
1231 * build R_386_RELATIVE
1232 * fi
1233 */
1234 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) &&
1235 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) &&
1236 !(IS_GOT_BASED(rsp->rel_rtype)) &&
1237 !(rsp->rel_isdesc != NULL &&
1238 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) &&
1239 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) ||
1240 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) {
1241 Word ortype = rsp->rel_rtype;
1242
1243 rsp->rel_rtype = R_386_RELATIVE;
1244 if (ld_add_outrel(NULL, rsp, ofl) == S_ERROR)
1245 return (S_ERROR);
1246 rsp->rel_rtype = ortype;
1247 }
1248
1249 /*
1250 * If the relocation is against a 'non-allocatable' section
1251 * and we can not resolve it now - then give a warning
1252 * message.
1253 *
1254 * We can not resolve the symbol if either:
1255 * a) it's undefined
1256 * b) it's defined in a shared library and a
1257 * COPY relocation hasn't moved it to the executable
1258 *
1259 * Note: because we process all of the relocations against the
1260 * text segment before any others - we know whether
1261 * or not a copy relocation will be generated before
1262 * we get here (see reloc_init()->reloc_segments()).
1263 */
1264 if (!(rsp->rel_flags & FLG_REL_LOAD) &&
1265 ((shndx == SHN_UNDEF) ||
1266 ((sdp->sd_ref == REF_DYN_NEED) &&
1267 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) {
1268 Conv_inv_buf_t inv_buf;
1269 Os_desc *osp = RELAUX_GET_OSDESC(rsp);
1270
1271 /*
1272 * If the relocation is against a SHT_SUNW_ANNOTATE
1273 * section - then silently ignore that the relocation
1274 * can not be resolved.
1275 */
1276 if (osp && (osp->os_shdr->sh_type == SHT_SUNW_ANNOTATE))
1277 return (0);
1278 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM),
1279 conv_reloc_386_type(rsp->rel_rtype, 0, &inv_buf),
1280 rsp->rel_isdesc->is_file->ifl_name,
1281 ld_reloc_sym_name(rsp), osp->os_name);
1282 return (1);
1283 }
1284
1285 /*
1286 * Perform relocation.
1287 */
1288 return (ld_add_actrel(NULL, rsp, ofl));
1289 }
1290
1291 static uintptr_t
1292 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl)
1293 {
1294 Word rtype = rsp->rel_rtype;
1295 Sym_desc *sdp = rsp->rel_sym;
1296 ofl_flag_t flags = ofl->ofl_flags;
1297 Gotndx *gnp;
1298
1299 /*
1300 * If we're building an executable - use either the IE or LE access
1301 * model. If we're building a shared object process any IE model.
1302 */
1303 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) {
1304 /*
1305 * Set the DF_STATIC_TLS flag.
1306 */
1307 ofl->ofl_dtflags |= DF_STATIC_TLS;
1308
1309 if (!local || ((flags & FLG_OF_EXEC) == 0)) {
1310 /*
1311 * Assign a GOT entry for static TLS references.
1312 */
1313 if ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1314 GOT_REF_TLSIE, ofl, NULL)) == NULL) {
1315
1316 if (ld_assign_got_TLS(local, rsp, ofl, sdp,
1317 gnp, GOT_REF_TLSIE, FLG_REL_STLS,
1318 rtype, R_386_TLS_TPOFF, NULL) == S_ERROR)
1319 return (S_ERROR);
1320 }
1321
1322 /*
1323 * IE access model.
1324 */
1325 if (IS_TLS_IE(rtype)) {
1326 if (ld_add_actrel(FLG_REL_STLS,
1327 rsp, ofl) == S_ERROR)
1328 return (S_ERROR);
1329
1330 /*
1331 * A non-pic shared object needs to adjust the
1332 * active relocation (indntpoff).
1333 */
1334 if (((flags & FLG_OF_EXEC) == 0) &&
1335 (rtype == R_386_TLS_IE)) {
1336 rsp->rel_rtype = R_386_RELATIVE;
1337 return (ld_add_outrel(NULL, rsp, ofl));
1338 }
1339 return (1);
1340 }
1341
1342 /*
1343 * Fixups are required for other executable models.
1344 */
1345 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
1346 rsp, ofl));
1347 }
1348
1349 /*
1350 * LE access model.
1351 */
1352 if (IS_TLS_LE(rtype) || (rtype == R_386_TLS_LDO_32))
1353 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl));
1354
1355 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
1356 rsp, ofl));
1357 }
1358
1359 /*
1360 * Building a shared object.
1361 *
1362 * Assign a GOT entry for a dynamic TLS reference.
1363 */
1364 if (IS_TLS_LD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1365 GOT_REF_TLSLD, ofl, NULL)) == NULL)) {
1366
1367 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD,
1368 FLG_REL_MTLS, rtype, R_386_TLS_DTPMOD32, NULL) == S_ERROR)
1369 return (S_ERROR);
1370
1371 } else if (IS_TLS_GD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1372 GOT_REF_TLSGD, ofl, NULL)) == NULL)) {
1373
1374 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD,
1375 FLG_REL_DTLS, rtype, R_386_TLS_DTPMOD32,
1376 R_386_TLS_DTPOFF32) == S_ERROR)
1377 return (S_ERROR);
1378 }
1379
1380 /*
1381 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually
1382 * cause a call to __tls_get_addr(). Convert this relocation to that
1383 * symbol now, and prepare for the PLT magic.
1384 */
1385 if ((rtype == R_386_TLS_GD_PLT) || (rtype == R_386_TLS_LDM_PLT)) {
1386 Sym_desc *tlsgetsym;
1387
1388 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_UU),
1389 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR)
1390 return (S_ERROR);
1391
1392 rsp->rel_sym = tlsgetsym;
1393 rsp->rel_rtype = R_386_PLT32;
1394
1395 if (ld_reloc_plt(rsp, ofl) == S_ERROR)
1396 return (S_ERROR);
1397
1398 rsp->rel_sym = sdp;
1399 rsp->rel_rtype = rtype;
1400 return (1);
1401 }
1402
1403 if (IS_TLS_LD(rtype))
1404 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl));
1405
1406 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl));
1407 }
1408
1409 /* ARGSUSED4 */
1410 static uintptr_t
1411 ld_assign_got_ndx(Alist **alpp, Gotndx *pgnp, Gotref gref, Ofl_desc *ofl,
1412 Rel_desc *rsp, Sym_desc *sdp)
1413 {
1414 Gotndx gn, *gnp;
1415 uint_t gotents;
1416
1417 if (pgnp)
1418 return (1);
1419
1420 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD))
1421 gotents = 2;
1422 else
1423 gotents = 1;
1424
1425 gn.gn_addend = 0;
1426 gn.gn_gotndx = ofl->ofl_gotcnt;
1427 gn.gn_gotref = gref;
1428
1429 ofl->ofl_gotcnt += gotents;
1430
1431 if (gref == GOT_REF_TLSLD) {
1432 if (ofl->ofl_tlsldgotndx == NULL) {
1433 if ((gnp = libld_malloc(sizeof (Gotndx))) == NULL)
1434 return (S_ERROR);
1435 (void) memcpy(gnp, &gn, sizeof (Gotndx));
1436 ofl->ofl_tlsldgotndx = gnp;
1437 }
1438 return (1);
1439 }
1440
1441 /*
1442 * GOT indexes are maintained on an Alist, where there is typically
1443 * only one index. The usage of this list is to scan the list to find
1444 * an index, and then apply that index immediately to a relocation.
1445 * Thus there are no external references to these GOT index structures
1446 * that can be compromised by the Alist being reallocated.
1447 */
1448 if (alist_append(alpp, &gn, sizeof (Gotndx), AL_CNT_SDP_GOT) == NULL)
1449 return (S_ERROR);
1450
1451 return (1);
1452 }
1453
1454 static void
1455 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl)
1456 {
1457 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++;
1458 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++;
1459 ofl->ofl_flags |= FLG_OF_BLDGOT;
1460 }
1461
1462 /*
1463 * Initializes .got[0] with the _DYNAMIC symbol value.
1464 */
1465 static uintptr_t
1466 ld_fillin_gotplt(Ofl_desc *ofl)
1467 {
1468 ofl_flag_t flags = ofl->ofl_flags;
1469 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0;
1470
1471 if (ofl->ofl_osgot) {
1472 Sym_desc *sdp;
1473
1474 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U),
1475 SYM_NOHASH, NULL, ofl)) != NULL) {
1476 uchar_t *genptr;
1477
1478 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf +
1479 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE));
1480 /* LINTED */
1481 *(Word *)genptr = (Word)sdp->sd_sym->st_value;
1482 if (bswap)
1483 /* LINTED */
1484 *(Word *)genptr =
1485 /* LINTED */
1486 ld_bswap_Word(*(Word *)genptr);
1487 }
1488 }
1489
1490 /*
1491 * Fill in the reserved slot in the procedure linkage table the first
1492 * entry is:
1493 * if (building a.out) {
1494 * PUSHL got[1] # the address of the link map entry
1495 * JMP * got[2] # the address of rtbinder
1496 * } else {
1497 * PUSHL got[1]@GOT(%ebx) # the address of the link map entry
1498 * JMP * got[2]@GOT(%ebx) # the address of rtbinder
1499 * }
1500 */
1501 if ((flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) {
1502 uchar_t *pltent;
1503
1504 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf;
1505 if (!(flags & FLG_OF_SHAROBJ)) {
1506 pltent[0] = M_SPECIAL_INST;
1507 pltent[1] = M_PUSHL_DISP;
1508 pltent += 2;
1509 /* LINTED */
1510 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->
1511 sh_addr + M_GOT_XLINKMAP * M_GOT_ENTSIZE);
1512 if (bswap)
1513 /* LINTED */
1514 *(Word *)pltent =
1515 /* LINTED */
1516 ld_bswap_Word(*(Word *)pltent);
1517 pltent += 4;
1518 pltent[0] = M_SPECIAL_INST;
1519 pltent[1] = M_JMP_DISP_IND;
1520 pltent += 2;
1521 /* LINTED */
1522 *(Word *)pltent = (Word)(ofl->ofl_osgot->os_shdr->
1523 sh_addr + M_GOT_XRTLD * M_GOT_ENTSIZE);
1524 if (bswap)
1525 /* LINTED */
1526 *(Word *)pltent =
1527 /* LINTED */
1528 ld_bswap_Word(*(Word *)pltent);
1529 } else {
1530 pltent[0] = M_SPECIAL_INST;
1531 pltent[1] = M_PUSHL_REG_DISP;
1532 pltent += 2;
1533 /* LINTED */
1534 *(Word *)pltent = (Word)(M_GOT_XLINKMAP *
1535 M_GOT_ENTSIZE);
1536 if (bswap)
1537 /* LINTED */
1538 *(Word *)pltent =
1539 /* LINTED */
1540 ld_bswap_Word(*(Word *)pltent);
1541 pltent += 4;
1542 pltent[0] = M_SPECIAL_INST;
1543 pltent[1] = M_JMP_REG_DISP_IND;
1544 pltent += 2;
1545 /* LINTED */
1546 *(Word *)pltent = (Word)(M_GOT_XRTLD *
1547 M_GOT_ENTSIZE);
1548 if (bswap)
1549 /* LINTED */
1550 *(Word *)pltent =
1551 /* LINTED */
1552 ld_bswap_Word(*(Word *)pltent);
1553 }
1554 }
1555 return (1);
1556 }
1557
1558
1559
1560 /*
1561 * Template for generating "void (*)(void)" function
1562 */
1563 static const uchar_t nullfunc_tmpl[] = { /* IA32 */
1564 /* 0x00 */ 0xc3 /* ret */
1565 };
1566
1567
1568
1569 /*
1570 * Function used to provide fill padding in SHF_EXECINSTR sections
1571 *
1572 * entry:
1573 *
1574 * base - base address of section being filled
1575 * offset - starting offset for fill within memory referenced by base
1576 * cnt - # bytes to be filled
1577 *
1578 * exit:
1579 * The fill has been completed.
1580 */
1581 static void
1582 execfill(void *base, off_t off, size_t cnt)
1583 {
1584 /*
1585 * 0x90 is an X86 NOP instruction in both 32 and 64-bit worlds.
1586 * There are no alignment constraints.
1587 */
1588 (void) memset(off + (char *)base, 0x90, cnt);
1589 }
1590
1591
1592 /*
1593 * Return the ld_targ definition for this target.
1594 */
1595 const Target *
1596 ld_targ_init_x86(void)
1597 {
1598 static const Target _ld_targ = {
1599 { /* Target_mach */
1600 M_MACH, /* m_mach */
1601 M_MACHPLUS, /* m_machplus */
1602 M_FLAGSPLUS, /* m_flagsplus */
1603 M_CLASS, /* m_class */
1604 M_DATA, /* m_data */
1605
1606 M_SEGM_ALIGN, /* m_segm_align */
1607 M_SEGM_ORIGIN, /* m_segm_origin */
1608 M_SEGM_AORIGIN, /* m_segm_aorigin */
1609 M_DATASEG_PERM, /* m_dataseg_perm */
1610 M_STACK_PERM, /* m_stack_perm */
1611 M_WORD_ALIGN, /* m_word_align */
1612 MSG_ORIG(MSG_PTH_RTLD), /* m_def_interp */
1613
1614 /* Relocation type codes */
1615 M_R_ARRAYADDR, /* m_r_arrayaddr */
1616 M_R_COPY, /* m_r_copy */
1617 M_R_GLOB_DAT, /* m_r_glob_dat */
1618 M_R_JMP_SLOT, /* m_r_jmp_slot */
1619 M_R_NUM, /* m_r_num */
1620 M_R_NONE, /* m_r_none */
1621 M_R_RELATIVE, /* m_r_relative */
1622 M_R_REGISTER, /* m_r_register */
1623
1624 /* Relocation related constants */
1625 M_REL_DT_COUNT, /* m_rel_dt_count */
1626 M_REL_DT_ENT, /* m_rel_dt_ent */
1627 M_REL_DT_SIZE, /* m_rel_dt_size */
1628 M_REL_DT_TYPE, /* m_rel_dt_type */
1629 M_REL_SHT_TYPE, /* m_rel_sht_type */
1630
1631 /* GOT related constants */
1632 M_GOT_ENTSIZE, /* m_got_entsize */
1633 M_GOT_XNumber, /* m_got_xnumber */
1634
1635 /* PLT related constants */
1636 M_PLT_ALIGN, /* m_plt_align */
1637 M_PLT_ENTSIZE, /* m_plt_entsize */
1638 M_PLT_RESERVSZ, /* m_plt_reservsz */
1639 M_PLT_SHF_FLAGS, /* m_plt_shf_flags */
1640
1641 /* Section type of .eh_frame/.eh_frame_hdr sections */
1642 SHT_PROGBITS, /* m_sht_unwind */
1643
1644 M_DT_REGISTER, /* m_dt_register */
1645 },
1646 { /* Target_machid */
1647 M_ID_ARRAY, /* id_array */
1648 M_ID_BSS, /* id_bss */
1649 M_ID_CAP, /* id_cap */
1650 M_ID_CAPINFO, /* id_capinfo */
1651 M_ID_CAPCHAIN, /* id_capchain */
1652 M_ID_DATA, /* id_data */
1653 M_ID_DYNAMIC, /* id_dynamic */
1654 M_ID_DYNSORT, /* id_dynsort */
1655 M_ID_DYNSTR, /* id_dynstr */
1656 M_ID_DYNSYM, /* id_dynsym */
1657 M_ID_DYNSYM_NDX, /* id_dynsym_ndx */
1658 M_ID_GOT, /* id_got */
1659 M_ID_UNKNOWN, /* id_gotdata (unused) */
1660 M_ID_HASH, /* id_hash */
1661 M_ID_INTERP, /* id_interp */
1662 M_ID_LBSS, /* id_lbss */
1663 M_ID_LDYNSYM, /* id_ldynsym */
1664 M_ID_NOTE, /* id_note */
1665 M_ID_NULL, /* id_null */
1666 M_ID_PLT, /* id_plt */
1667 M_ID_REL, /* id_rel */
1668 M_ID_STRTAB, /* id_strtab */
1669 M_ID_SYMINFO, /* id_syminfo */
1670 M_ID_SYMTAB, /* id_symtab */
1671 M_ID_SYMTAB_NDX, /* id_symtab_ndx */
1672 M_ID_TEXT, /* id_text */
1673 M_ID_TLS, /* id_tls */
1674 M_ID_TLSBSS, /* id_tlsbss */
1675 M_ID_UNKNOWN, /* id_unknown */
1676 M_ID_UNWIND, /* id_unwind */
1677 M_ID_UNWINDHDR, /* id_unwindhdr */
1678 M_ID_USER, /* id_user */
1679 M_ID_VERSION, /* id_version */
1680 },
1681 { /* Target_nullfunc */
1682 nullfunc_tmpl, /* nf_template */
1683 sizeof (nullfunc_tmpl), /* nf_size */
1684 },
1685 { /* Target_fillfunc */
1686 execfill /* ff_execfill */
1687 },
1688 { /* Target_machrel */
1689 reloc_table,
1690
1691 ld_init_rel, /* mr_init_rel */
1692 ld_mach_eflags, /* mr_mach_eflags */
1693 ld_mach_make_dynamic, /* mr_mach_make_dynamic */
1694 ld_mach_update_odynamic, /* mr_mach_update_odynamic */
1695 ld_calc_plt_addr, /* mr_calc_plt_addr */
1696 ld_perform_outreloc, /* mr_perform_outreloc */
1697 ld_do_activerelocs, /* mr_do_activerelocs */
1698 ld_add_outrel, /* mr_add_outrel */
1699 NULL, /* mr_reloc_register */
1700 ld_reloc_local, /* mr_reloc_local */
1701 NULL, /* mr_reloc_GOTOP */
1702 ld_reloc_TLS, /* mr_reloc_TLS */
1703 NULL, /* mr_assign_got */
1704 ld_find_got_ndx, /* mr_find_got_ndx */
1705 ld_calc_got_offset, /* mr_calc_got_offset */
1706 ld_assign_got_ndx, /* mr_assign_got_ndx */
1707 ld_assign_plt_ndx, /* mr_assign_plt_ndx */
1708 NULL, /* mr_allocate_got */
1709 ld_fillin_gotplt, /* mr_fillin_gotplt */
1710 },
1711 { /* Target_machsym */
1712 NULL, /* ms_reg_check */
1713 NULL, /* ms_mach_sym_typecheck */
1714 NULL, /* ms_is_regsym */
1715 NULL, /* ms_reg_find */
1716 NULL /* ms_reg_enter */
1717 }
1718 };
1719
1720 return (&_ld_targ);
1721 }