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) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 /* Get the x86 version of the relocation engine */
27 #define DO_RELOC_LIBLD_X86
28
29 #include <string.h>
30 #include <stdio.h>
31 #include <strings.h>
32 #include <sys/elf_amd64.h>
33 #include <debug.h>
34 #include <reloc.h>
35 #include <i386/machdep_x86.h>
36 #include "msg.h"
37 #include "_libld.h"
38
39 /*
40 * This module uses do_reloc_ld() to execute several synthesized relocations.
41 * That function expects to be passed two things that we need to construct
42 * here:
43 *
44 * 1) A Rel_desc descriptor for each relocation type, from which the
45 * rel_rtype field, and nothing else, is obtained. This is easily
46 * handled by constructing the necessary descriptors.
47 *
48 * 2) A function, which called with the Rel_desc descriptor, returns
49 * a string representing the name of the symbol associated with
50 * the descriptor. The usual function for this is ld_reloc_sym_name().
51 * However, that function will not work in this case, as these synthetic
52 * relocations do not have an associated symbol. We supply the
53 * syn_rdesc_sym_name() function to simply return the fixed name.
54 */
55 static Rel_desc rdesc_r_amd64_gotpcrel = {
56 NULL, NULL, NULL, 0, 0, 0, R_AMD64_GOTPCREL };
57 static Rel_desc rdesc_r_amd64_32 = {
58 NULL, NULL, NULL, 0, 0, 0, R_AMD64_32 };
59 static Rel_desc rdesc_r_amd64_pc32 = {
60 NULL, NULL, NULL, 0, 0, 0, R_AMD64_PC32 };
61
62 /*ARGSUSED*/
63 static const char *
64 syn_rdesc_sym_name(Rel_desc *rdesc)
65 {
66 return (MSG_ORIG(MSG_SYM_PLTENT));
67 }
68
69 /*
70 * Search the GOT index list for a GOT entry with a matching reference and the
71 * proper addend.
72 */
73 static Gotndx *
74 ld_find_got_ndx(Alist *alp, Gotref gref, Ofl_desc *ofl, Rel_desc *rdesc)
75 {
76 Aliste idx;
77 Gotndx *gnp;
78
79 assert(rdesc != 0);
80
81 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx)
82 return (ofl->ofl_tlsldgotndx);
83
84 for (ALIST_TRAVERSE(alp, idx, gnp)) {
85 if ((rdesc->rel_raddend == gnp->gn_addend) &&
86 (gnp->gn_gotref == gref)) {
87 return (gnp);
88 }
89 }
90 return (NULL);
91 }
92
93 static Xword
94 ld_calc_got_offset(Rel_desc *rdesc, Ofl_desc *ofl)
95 {
96 Os_desc *osp = ofl->ofl_osgot;
97 Sym_desc *sdp = rdesc->rel_sym;
98 Xword gotndx;
99 Gotref gref;
100 Gotndx *gnp;
101
102 if (rdesc->rel_flags & FLG_REL_DTLS)
103 gref = GOT_REF_TLSGD;
104 else if (rdesc->rel_flags & FLG_REL_MTLS)
105 gref = GOT_REF_TLSLD;
106 else if (rdesc->rel_flags & FLG_REL_STLS)
107 gref = GOT_REF_TLSIE;
108 else
109 gref = GOT_REF_GENERIC;
110
111 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, rdesc);
112 assert(gnp);
113
114 gotndx = (Xword)gnp->gn_gotndx;
115
116 if ((rdesc->rel_flags & FLG_REL_DTLS) &&
117 (rdesc->rel_rtype == R_AMD64_DTPOFF64))
118 gotndx++;
119
120 return ((Xword)(osp->os_shdr->sh_addr + (gotndx * M_GOT_ENTSIZE)));
121 }
122
123 static Word
124 ld_init_rel(Rel_desc *reld, Word *typedata, void *reloc)
125 {
126 Rela *rel = (Rela *)reloc;
127
128 /* LINTED */
129 reld->rel_rtype = (Word)ELF_R_TYPE(rel->r_info, M_MACH);
130 reld->rel_roffset = rel->r_offset;
131 reld->rel_raddend = rel->r_addend;
132 *typedata = 0;
133
134 reld->rel_flags |= FLG_REL_RELA;
135
136 return ((Word)ELF_R_SYM(rel->r_info));
137 }
138
139 static void
140 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl)
141 {
142 ofl->ofl_dehdr->e_flags |= ehdr->e_flags;
143 }
144
145 static void
146 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt)
147 {
148 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) {
149 /*
150 * Create this entry if we are going to create a PLT table.
151 */
152 if (ofl->ofl_pltcnt)
153 (*cnt)++; /* DT_PLTGOT */
154 }
155 }
156
157 static void
158 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn)
159 {
160 if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) {
161 (*dyn)->d_tag = DT_PLTGOT;
162 if (ofl->ofl_osgot)
163 (*dyn)->d_un.d_ptr = ofl->ofl_osgot->os_shdr->sh_addr;
164 else
165 (*dyn)->d_un.d_ptr = 0;
166 (*dyn)++;
167 }
168 }
169
170 static Xword
171 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl)
172 {
173 Xword value;
174
175 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) +
176 M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) * M_PLT_ENTSIZE);
177 return (value);
178 }
179
180 /*
181 * Build a single plt entry - code is:
182 * JMP *name1@GOTPCREL(%rip)
183 * PUSHL $index
184 * JMP .PLT0
185 */
186 static uchar_t pltn_entry[M_PLT_ENTSIZE] = {
187 /* 0x00 jmpq *name1@GOTPCREL(%rip) */ 0xff, 0x25, 0x00, 0x00, 0x00, 0x00,
188 /* 0x06 pushq $index */ 0x68, 0x00, 0x00, 0x00, 0x00,
189 /* 0x0b jmpq .plt0(%rip) */ 0xe9, 0x00, 0x00, 0x00, 0x00
190 /* 0x10 */
191 };
192
193 static uintptr_t
194 plt_entry(Ofl_desc * ofl, Sym_desc * sdp)
195 {
196 uchar_t *plt0, *pltent, *gotent;
197 Sword plt_off;
198 Word got_off;
199 Xword val1;
200 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0;
201
202 got_off = sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
203 plt_off = M_PLT_RESERVSZ + ((sdp->sd_aux->sa_PLTndx - 1) *
204 M_PLT_ENTSIZE);
205 plt0 = (uchar_t *)(ofl->ofl_osplt->os_outdata->d_buf);
206 pltent = plt0 + plt_off;
207 gotent = (uchar_t *)(ofl->ofl_osgot->os_outdata->d_buf) + got_off;
208
209 bcopy(pltn_entry, pltent, sizeof (pltn_entry));
210 /*
211 * Fill in the got entry with the address of the next instruction.
212 */
213 /* LINTED */
214 *(Word *)gotent = ofl->ofl_osplt->os_shdr->sh_addr + plt_off +
215 M_PLT_INSSIZE;
216 if (bswap)
217 /* LINTED */
218 *(Word *)gotent = ld_bswap_Word(*(Word *)gotent);
219
220 /*
221 * If '-z noreloc' is specified - skip the do_reloc_ld
222 * stage.
223 */
224 if (!OFL_DO_RELOC(ofl))
225 return (1);
226
227 /*
228 * patchup:
229 * jmpq *name1@gotpcrel(%rip)
230 *
231 * NOTE: 0x06 represents next instruction.
232 */
233 val1 = (ofl->ofl_osgot->os_shdr->sh_addr + got_off) -
234 (ofl->ofl_osplt->os_shdr->sh_addr + plt_off) - 0x06;
235
236 if (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x02], &val1,
237 syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap,
238 ofl->ofl_lml) == 0) {
239 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL),
240 sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name));
241 return (S_ERROR);
242 }
243
244 /*
245 * patchup:
246 * pushq $pltndx
247 */
248 val1 = (Xword)(sdp->sd_aux->sa_PLTndx - 1);
249
250 if (do_reloc_ld(&rdesc_r_amd64_32, &pltent[0x07], &val1,
251 syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap,
252 ofl->ofl_lml) == 0) {
253 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL),
254 sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name));
255 return (S_ERROR);
256 }
257
258 /*
259 * patchup:
260 * jmpq .plt0(%rip)
261 * NOTE: 0x10 represents next instruction. The rather complex
262 * series of casts is necessary to sign extend an offset into
263 * a 64-bit value while satisfying various compiler error
264 * checks. Handle with care.
265 */
266 val1 = (Xword)((intptr_t)((uintptr_t)plt0 -
267 (uintptr_t)(&pltent[0x10])));
268
269 if (do_reloc_ld(&rdesc_r_amd64_pc32, &pltent[0x0c], &val1,
270 syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT), bswap,
271 ofl->ofl_lml) == 0) {
272 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLTNFAIL),
273 sdp->sd_aux->sa_PLTndx, demangle(sdp->sd_name));
274 return (S_ERROR);
275 }
276
277 return (1);
278 }
279
280 static uintptr_t
281 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl, Boolean *remain_seen)
282 {
283 Os_desc * relosp, * osp = 0;
284 Word ndx;
285 Xword roffset, value;
286 Sxword raddend;
287 Rela rea;
288 char *relbits;
289 Sym_desc * sdp, * psym = (Sym_desc *)0;
290 int sectmoved = 0;
291
292 raddend = orsp->rel_raddend;
293 sdp = orsp->rel_sym;
294
295 /*
296 * If the section this relocation is against has been discarded
297 * (-zignore), then also discard (skip) the relocation itself.
298 */
299 if (orsp->rel_isdesc && ((orsp->rel_flags &
300 (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) &&
301 (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) {
302 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp));
303 return (1);
304 }
305
306 /*
307 * If this is a relocation against a move table, or expanded move
308 * table, adjust the relocation entries.
309 */
310 if (RELAUX_GET_MOVE(orsp))
311 ld_adj_movereloc(ofl, orsp);
312
313 /*
314 * If this is a relocation against a section then we need to adjust the
315 * raddend field to compensate for the new position of the input section
316 * within the new output section.
317 */
318 if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) {
319 if (ofl->ofl_parsyms &&
320 (sdp->sd_isc->is_flags & FLG_IS_RELUPD) &&
321 /* LINTED */
322 (psym = ld_am_I_partial(orsp, orsp->rel_raddend))) {
323 DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym));
324 sectmoved = 1;
325 if (ofl->ofl_flags & FLG_OF_RELOBJ)
326 raddend = psym->sd_sym->st_value;
327 else
328 raddend = psym->sd_sym->st_value -
329 psym->sd_isc->is_osdesc->os_shdr->sh_addr;
330 /* LINTED */
331 raddend += (Off)_elf_getxoff(psym->sd_isc->is_indata);
332 if (psym->sd_isc->is_shdr->sh_flags & SHF_ALLOC)
333 raddend +=
334 psym->sd_isc->is_osdesc->os_shdr->sh_addr;
335 } else {
336 /* LINTED */
337 raddend += (Off)_elf_getxoff(sdp->sd_isc->is_indata);
338 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC)
339 raddend +=
340 sdp->sd_isc->is_osdesc->os_shdr->sh_addr;
341 }
342 }
343
344 value = sdp->sd_sym->st_value;
345
346 if (orsp->rel_flags & FLG_REL_GOT) {
347 /*
348 * Note: for GOT relative relocations on amd64
349 * we discard the addend. It was relevant
350 * to the reference - not to the data item
351 * being referenced (ie: that -4 thing).
352 */
353 raddend = 0;
354 osp = ofl->ofl_osgot;
355 roffset = ld_calc_got_offset(orsp, ofl);
356
357 } else if (orsp->rel_flags & FLG_REL_PLT) {
358 /*
359 * Note that relocations for PLT's actually
360 * cause a relocation againt the GOT.
361 */
362 osp = ofl->ofl_osplt;
363 roffset = (ofl->ofl_osgot->os_shdr->sh_addr) +
364 sdp->sd_aux->sa_PLTGOTndx * M_GOT_ENTSIZE;
365 raddend = 0;
366 if (plt_entry(ofl, sdp) == S_ERROR)
367 return (S_ERROR);
368
369 } else if (orsp->rel_flags & FLG_REL_BSS) {
370 /*
371 * This must be a R_AMD64_COPY. For these set the roffset to
372 * point to the new symbols location.
373 */
374 osp = ofl->ofl_isbss->is_osdesc;
375 roffset = value;
376
377 /*
378 * The raddend doesn't mean anything in a R_SPARC_COPY
379 * relocation. Null it out because it can confuse people.
380 */
381 raddend = 0;
382 } else {
383 osp = RELAUX_GET_OSDESC(orsp);
384
385 /*
386 * Calculate virtual offset of reference point; equals offset
387 * into section + vaddr of section for loadable sections, or
388 * offset plus section displacement for nonloadable sections.
389 */
390 roffset = orsp->rel_roffset +
391 (Off)_elf_getxoff(orsp->rel_isdesc->is_indata);
392 if (!(ofl->ofl_flags & FLG_OF_RELOBJ))
393 roffset += orsp->rel_isdesc->is_osdesc->
394 os_shdr->sh_addr;
395 }
396
397 if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0))
398 relosp = ofl->ofl_osrel;
399
400 /*
401 * Assign the symbols index for the output relocation. If the
402 * relocation refers to a SECTION symbol then it's index is based upon
403 * the output sections symbols index. Otherwise the index can be
404 * derived from the symbols index itself.
405 */
406 if (orsp->rel_rtype == R_AMD64_RELATIVE)
407 ndx = STN_UNDEF;
408 else if ((orsp->rel_flags & FLG_REL_SCNNDX) ||
409 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) {
410 if (sectmoved == 0) {
411 /*
412 * Check for a null input section. This can
413 * occur if this relocation references a symbol
414 * generated by sym_add_sym().
415 */
416 if (sdp->sd_isc && sdp->sd_isc->is_osdesc)
417 ndx = sdp->sd_isc->is_osdesc->os_identndx;
418 else
419 ndx = sdp->sd_shndx;
420 } else
421 ndx = ofl->ofl_parexpnndx;
422 } else
423 ndx = sdp->sd_symndx;
424
425 /*
426 * Add the symbols 'value' to the addend field.
427 */
428 if (orsp->rel_flags & FLG_REL_ADVAL)
429 raddend += value;
430
431 /*
432 * The addend field for R_AMD64_DTPMOD64 means nothing. The addend
433 * is propagated in the corresponding R_AMD64_DTPOFF64 relocation.
434 */
435 if (orsp->rel_rtype == R_AMD64_DTPMOD64)
436 raddend = 0;
437
438 relbits = (char *)relosp->os_outdata->d_buf;
439
440 rea.r_info = ELF_R_INFO(ndx, orsp->rel_rtype);
441 rea.r_offset = roffset;
442 rea.r_addend = raddend;
443 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, relosp->os_name,
444 ld_reloc_sym_name(orsp)));
445
446 /*
447 * Assert we haven't walked off the end of our relocation table.
448 */
449 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size);
450
451 (void) memcpy((relbits + relosp->os_szoutrels),
452 (char *)&rea, sizeof (Rela));
453 relosp->os_szoutrels += (Xword)sizeof (Rela);
454
455 /*
456 * Determine if this relocation is against a non-writable, allocatable
457 * section. If so we may need to provide a text relocation diagnostic.
458 * Note that relocations against the .plt (R_AMD64_JUMP_SLOT) actually
459 * result in modifications to the .got.
460 */
461 if (orsp->rel_rtype == R_AMD64_JUMP_SLOT)
462 osp = ofl->ofl_osgot;
463
464 ld_reloc_remain_entry(orsp, osp, ofl, remain_seen);
465 return (1);
466 }
467
468 /*
469 * amd64 Instructions for TLS processing
470 */
471 static uchar_t tlsinstr_gd_ie[] = {
472 /*
473 * 0x00 movq %fs:0, %rax
474 */
475 0x64, 0x48, 0x8b, 0x04, 0x25,
476 0x00, 0x00, 0x00, 0x00,
477 /*
478 * 0x09 addq x@gottpoff(%rip), %rax
479 */
480 0x48, 0x03, 0x05, 0x00, 0x00,
481 0x00, 0x00
482 };
483
484 static uchar_t tlsinstr_gd_le[] = {
485 /*
486 * 0x00 movq %fs:0, %rax
487 */
488 0x64, 0x48, 0x8b, 0x04, 0x25,
489 0x00, 0x00, 0x00, 0x00,
490 /*
491 * 0x09 leaq x@gottpoff(%rip), %rax
492 */
493 0x48, 0x8d, 0x80, 0x00, 0x00,
494 0x00, 0x00
495 };
496
497 static uchar_t tlsinstr_ld_le[] = {
498 /*
499 * .byte 0x66
500 */
501 0x66,
502 /*
503 * .byte 0x66
504 */
505 0x66,
506 /*
507 * .byte 0x66
508 */
509 0x66,
510 /*
511 * movq %fs:0, %rax
512 */
513 0x64, 0x48, 0x8b, 0x04, 0x25,
514 0x00, 0x00, 0x00, 0x00
515 };
516
517 #define REX_B 0x1
518 #define REX_X 0x2
519 #define REX_R 0x4
520 #define REX_W 0x8
521 #define REX_PREFIX 0x40
522
523 #define REX_RW (REX_PREFIX | REX_R | REX_W)
524 #define REX_BW (REX_PREFIX | REX_B | REX_W)
525 #define REX_BRW (REX_PREFIX | REX_B | REX_R | REX_W)
526
527 #define REG_ESP 0x4
528
529 #define INSN_ADDMR 0x03 /* addq mem,reg */
530 #define INSN_ADDIR 0x81 /* addq imm,reg */
531 #define INSN_MOVMR 0x8b /* movq mem,reg */
532 #define INSN_MOVIR 0xc7 /* movq imm,reg */
533 #define INSN_LEA 0x8d /* leaq mem,reg */
534
535 static Fixupret
536 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp)
537 {
538 Sym_desc *sdp = arsp->rel_sym;
539 Word rtype = arsp->rel_rtype;
540 uchar_t *offset;
541
542 offset = (uchar_t *)((uintptr_t)arsp->rel_roffset +
543 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) +
544 (uintptr_t)RELAUX_GET_OSDESC(arsp)->os_outdata->d_buf);
545
546 /*
547 * Note that in certain of the original insn sequences below, the
548 * instructions are not necessarily adjacent
549 */
550 if (sdp->sd_ref == REF_DYN_NEED) {
551 /*
552 * IE reference model
553 */
554 switch (rtype) {
555 case R_AMD64_TLSGD:
556 /*
557 * GD -> IE
558 *
559 * Transition:
560 * 0x00 .byte 0x66
561 * 0x01 leaq x@tlsgd(%rip), %rdi
562 * 0x08 .word 0x6666
563 * 0x0a rex64
564 * 0x0b call __tls_get_addr@plt
565 * 0x10
566 * To:
567 * 0x00 movq %fs:0, %rax
568 * 0x09 addq x@gottpoff(%rip), %rax
569 * 0x10
570 */
571 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
572 R_AMD64_GOTTPOFF, arsp, ld_reloc_sym_name));
573 arsp->rel_rtype = R_AMD64_GOTTPOFF;
574 arsp->rel_roffset += 8;
575 arsp->rel_raddend = (Sxword)-4;
576
577 /*
578 * Adjust 'offset' to beginning of instruction
579 * sequence.
580 */
581 offset -= 4;
582 (void) memcpy(offset, tlsinstr_gd_ie,
583 sizeof (tlsinstr_gd_ie));
584 return (FIX_RELOC);
585
586 case R_AMD64_PLT32:
587 /*
588 * Fixup done via the TLS_GD relocation.
589 */
590 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
591 R_AMD64_NONE, arsp, ld_reloc_sym_name));
592 return (FIX_DONE);
593 }
594 }
595
596 /*
597 * LE reference model
598 */
599 switch (rtype) {
600 case R_AMD64_TLSGD:
601 /*
602 * GD -> LE
603 *
604 * Transition:
605 * 0x00 .byte 0x66
606 * 0x01 leaq x@tlsgd(%rip), %rdi
607 * 0x08 .word 0x6666
608 * 0x0a rex64
609 * 0x0b call __tls_get_addr@plt
610 * 0x10
611 * To:
612 * 0x00 movq %fs:0, %rax
613 * 0x09 leaq x@tpoff(%rax), %rax
614 * 0x10
615 */
616 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
617 R_AMD64_TPOFF32, arsp, ld_reloc_sym_name));
618 arsp->rel_rtype = R_AMD64_TPOFF32;
619 arsp->rel_roffset += 8;
620 arsp->rel_raddend = 0;
621
622 /*
623 * Adjust 'offset' to beginning of instruction sequence.
624 */
625 offset -= 4;
626 (void) memcpy(offset, tlsinstr_gd_le, sizeof (tlsinstr_gd_le));
627 return (FIX_RELOC);
628
629 case R_AMD64_GOTTPOFF: {
630 /*
631 * IE -> LE
632 *
633 * Transition 1:
634 * movq %fs:0, %reg
635 * addq x@gottpoff(%rip), %reg
636 * To:
637 * movq %fs:0, %reg
638 * leaq x@tpoff(%reg), %reg
639 *
640 * Transition (as a special case):
641 * movq %fs:0, %r12/%rsp
642 * addq x@gottpoff(%rip), %r12/%rsp
643 * To:
644 * movq %fs:0, %r12/%rsp
645 * addq x@tpoff(%rax), %r12/%rsp
646 *
647 * Transition 2:
648 * movq x@gottpoff(%rip), %reg
649 * movq %fs:(%reg), %reg
650 * To:
651 * movq x@tpoff(%reg), %reg
652 * movq %fs:(%reg), %reg
653 */
654 Conv_inv_buf_t inv_buf;
655 uint8_t reg; /* Register */
656
657 offset -= 3;
658
659 reg = offset[2] >> 3; /* Encoded dest. reg. operand */
660
661 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
662 R_AMD64_TPOFF32, arsp, ld_reloc_sym_name));
663 arsp->rel_rtype = R_AMD64_TPOFF32;
664 arsp->rel_raddend = 0;
665
666 /*
667 * This is transition 2, and the special case of form 1 where
668 * a normal transition would index %rsp or %r12 and need a SIB
669 * byte in the leaq for which we lack space
670 */
671 if ((offset[1] == INSN_MOVMR) ||
672 ((offset[1] == INSN_ADDMR) && (reg == REG_ESP))) {
673 /*
674 * If we needed an extra bit of MOD.reg to refer to
675 * this register as the dest of the original movq we
676 * need an extra bit of MOD.rm to refer to it in the
677 * dest of the replacement movq or addq.
678 */
679 if (offset[0] == REX_RW)
680 offset[0] = REX_BW;
681
682 offset[1] = (offset[1] == INSN_MOVMR) ?
683 INSN_MOVIR : INSN_ADDIR;
684 offset[2] = 0xc0 | reg;
685
686 return (FIX_RELOC);
687 } else if (offset[1] == INSN_ADDMR) {
688 /*
689 * If we needed an extra bit of MOD.reg to refer to
690 * this register in the dest of the addq we need an
691 * extra bit of both MOD.reg and MOD.rm to refer to it
692 * in the source and dest of the leaq
693 */
694 if (offset[0] == REX_RW)
695 offset[0] = REX_BRW;
696
697 offset[1] = INSN_LEA;
698 offset[2] = 0x80 | (reg << 3) | reg;
699
700 return (FIX_RELOC);
701 }
702
703 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_BADTLSINS),
704 conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf),
705 arsp->rel_isdesc->is_file->ifl_name,
706 ld_reloc_sym_name(arsp),
707 arsp->rel_isdesc->is_name,
708 EC_OFF(arsp->rel_roffset));
709 return (FIX_ERROR);
710 }
711 case R_AMD64_TLSLD:
712 /*
713 * LD -> LE
714 *
715 * Transition
716 * 0x00 leaq x1@tlsgd(%rip), %rdi
717 * 0x07 call __tls_get_addr@plt
718 * 0x0c
719 * To:
720 * 0x00 .byte 0x66
721 * 0x01 .byte 0x66
722 * 0x02 .byte 0x66
723 * 0x03 movq %fs:0, %rax
724 */
725 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
726 R_AMD64_NONE, arsp, ld_reloc_sym_name));
727 offset -= 3;
728 (void) memcpy(offset, tlsinstr_ld_le, sizeof (tlsinstr_ld_le));
729 return (FIX_DONE);
730
731 case R_AMD64_DTPOFF32:
732 /*
733 * LD->LE
734 *
735 * Transition:
736 * 0x00 leaq x1@dtpoff(%rax), %rcx
737 * To:
738 * 0x00 leaq x1@tpoff(%rax), %rcx
739 */
740 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH,
741 R_AMD64_TPOFF32, arsp, ld_reloc_sym_name));
742 arsp->rel_rtype = R_AMD64_TPOFF32;
743 return (FIX_RELOC);
744 }
745
746 return (FIX_RELOC);
747 }
748
749 static uintptr_t
750 ld_do_activerelocs(Ofl_desc *ofl)
751 {
752 Rel_desc *arsp;
753 Rel_cachebuf *rcbp;
754 Aliste idx;
755 uintptr_t return_code = 1;
756 ofl_flag_t flags = ofl->ofl_flags;
757
758 if (aplist_nitems(ofl->ofl_actrels.rc_list) != 0)
759 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml));
760
761 /*
762 * Process active relocations.
763 */
764 REL_CACHE_TRAVERSE(&ofl->ofl_actrels, idx, rcbp, arsp) {
765 uchar_t *addr;
766 Xword value;
767 Sym_desc *sdp;
768 const char *ifl_name;
769 Xword refaddr;
770 int moved = 0;
771 Gotref gref;
772 Os_desc *osp;
773
774 /*
775 * If the section this relocation is against has been discarded
776 * (-zignore), then discard (skip) the relocation itself.
777 */
778 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) &&
779 ((arsp->rel_flags & (FLG_REL_GOT | FLG_REL_BSS |
780 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) {
781 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, arsp));
782 continue;
783 }
784
785 /*
786 * We determine what the 'got reference' model (if required)
787 * is at this point. This needs to be done before tls_fixup()
788 * since it may 'transition' our instructions.
789 *
790 * The got table entries have already been assigned,
791 * and we bind to those initial entries.
792 */
793 if (arsp->rel_flags & FLG_REL_DTLS)
794 gref = GOT_REF_TLSGD;
795 else if (arsp->rel_flags & FLG_REL_MTLS)
796 gref = GOT_REF_TLSLD;
797 else if (arsp->rel_flags & FLG_REL_STLS)
798 gref = GOT_REF_TLSIE;
799 else
800 gref = GOT_REF_GENERIC;
801
802 /*
803 * Perform any required TLS fixups.
804 */
805 if (arsp->rel_flags & FLG_REL_TLSFIX) {
806 Fixupret ret;
807
808 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR)
809 return (S_ERROR);
810 if (ret == FIX_DONE)
811 continue;
812 }
813
814 /*
815 * If this is a relocation against a move table, or
816 * expanded move table, adjust the relocation entries.
817 */
818 if (RELAUX_GET_MOVE(arsp))
819 ld_adj_movereloc(ofl, arsp);
820
821 sdp = arsp->rel_sym;
822 refaddr = arsp->rel_roffset +
823 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata);
824
825 if ((arsp->rel_flags & FLG_REL_CLVAL) ||
826 (arsp->rel_flags & FLG_REL_GOTCL))
827 value = 0;
828 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) {
829 Sym_desc *sym;
830
831 /*
832 * The value for a symbol pointing to a SECTION
833 * is based off of that sections position.
834 */
835 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) &&
836 /* LINTED */
837 (sym = ld_am_I_partial(arsp, arsp->rel_raddend))) {
838 /*
839 * The symbol was moved, so adjust the value
840 * relative to the new section.
841 */
842 value = sym->sd_sym->st_value;
843 moved = 1;
844
845 /*
846 * The original raddend covers the displacement
847 * from the section start to the desired
848 * address. The value computed above gets us
849 * from the section start to the start of the
850 * symbol range. Adjust the old raddend to
851 * remove the offset from section start to
852 * symbol start, leaving the displacement
853 * within the range of the symbol.
854 */
855 arsp->rel_raddend -= sym->sd_osym->st_value;
856 } else {
857 value = _elf_getxoff(sdp->sd_isc->is_indata);
858 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC)
859 value += sdp->sd_isc->is_osdesc->
860 os_shdr->sh_addr;
861 }
862 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS)
863 value -= ofl->ofl_tlsphdr->p_vaddr;
864
865 } else if (IS_SIZE(arsp->rel_rtype)) {
866 /*
867 * Size relocations require the symbols size.
868 */
869 value = sdp->sd_sym->st_size;
870
871 } else if ((sdp->sd_flags & FLG_SY_CAP) &&
872 sdp->sd_aux && sdp->sd_aux->sa_PLTndx) {
873 /*
874 * If relocation is against a capabilities symbol, we
875 * need to jump to an associated PLT, so that at runtime
876 * ld.so.1 is involved to determine the best binding
877 * choice. Otherwise, the value is the symbols value.
878 */
879 value = ld_calc_plt_addr(sdp, ofl);
880 } else
881 value = sdp->sd_sym->st_value;
882
883 /*
884 * Relocation against the GLOBAL_OFFSET_TABLE.
885 */
886 if ((arsp->rel_flags & FLG_REL_GOT) &&
887 !ld_reloc_set_aux_osdesc(ofl, arsp, ofl->ofl_osgot))
888 return (S_ERROR);
889 osp = RELAUX_GET_OSDESC(arsp);
890
891 /*
892 * If loadable and not producing a relocatable object add the
893 * sections virtual address to the reference address.
894 */
895 if ((arsp->rel_flags & FLG_REL_LOAD) &&
896 ((flags & FLG_OF_RELOBJ) == 0))
897 refaddr += arsp->rel_isdesc->is_osdesc->
898 os_shdr->sh_addr;
899
900 /*
901 * If this entry has a PLT assigned to it, its value is actually
902 * the address of the PLT (and not the address of the function).
903 */
904 if (IS_PLT(arsp->rel_rtype)) {
905 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx)
906 value = ld_calc_plt_addr(sdp, ofl);
907 }
908
909 /*
910 * Add relocations addend to value. Add extra
911 * relocation addend if needed.
912 *
913 * Note: For GOT relative relocations on amd64 we discard the
914 * addend. It was relevant to the reference - not to the
915 * data item being referenced (ie: that -4 thing).
916 */
917 if ((arsp->rel_flags & FLG_REL_GOT) == 0)
918 value += arsp->rel_raddend;
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, arsp);
944 assert(gnp);
945
946 if (arsp->rel_rtype == R_AMD64_DTPOFF64)
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_RELA, 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_GOTPCREL(arsp->rel_rtype) &&
976 ((flags & FLG_OF_RELOBJ) == 0)) {
977 Gotndx *gnp;
978
979 /*
980 * Calculation:
981 * G + GOT + A - P
982 */
983 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, arsp);
984 assert(gnp);
985 value = (Xword)(ofl->ofl_osgot->os_shdr-> sh_addr) +
986 ((Xword)gnp->gn_gotndx * M_GOT_ENTSIZE) +
987 arsp->rel_raddend - refaddr;
988
989 } else if (IS_GOT_PC(arsp->rel_rtype) &&
990 ((flags & FLG_OF_RELOBJ) == 0)) {
991 value = (Xword)(ofl->ofl_osgot->os_shdr->
992 sh_addr) - refaddr + arsp->rel_raddend;
993
994 } else if ((IS_PC_RELATIVE(arsp->rel_rtype)) &&
995 (((flags & FLG_OF_RELOBJ) == 0) ||
996 (osp == sdp->sd_isc->is_osdesc))) {
997 value -= refaddr;
998
999 } else if (IS_TLS_INS(arsp->rel_rtype) &&
1000 IS_GOT_RELATIVE(arsp->rel_rtype) &&
1001 ((flags & FLG_OF_RELOBJ) == 0)) {
1002 Gotndx *gnp;
1003
1004 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, arsp);
1005 assert(gnp);
1006 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
1007
1008 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) &&
1009 ((flags & FLG_OF_RELOBJ) == 0)) {
1010 Gotndx *gnp;
1011
1012 gnp = ld_find_got_ndx(sdp->sd_GOTndxs, gref, ofl, arsp);
1013 assert(gnp);
1014 value = (Xword)gnp->gn_gotndx * M_GOT_ENTSIZE;
1015
1016 } else if ((arsp->rel_flags & FLG_REL_STLS) &&
1017 ((flags & FLG_OF_RELOBJ) == 0)) {
1018 Xword tlsstatsize;
1019
1020 /*
1021 * This is the LE TLS reference model. Static
1022 * offset is hard-coded.
1023 */
1024 tlsstatsize = S_ROUND(ofl->ofl_tlsphdr->p_memsz,
1025 M_TLSSTATALIGN);
1026 value = tlsstatsize - value;
1027
1028 /*
1029 * Since this code is fixed up, it assumes a negative
1030 * offset that can be added to the thread pointer.
1031 */
1032 if (arsp->rel_rtype == R_AMD64_TPOFF32)
1033 value = -value;
1034 }
1035
1036 if (arsp->rel_isdesc->is_file)
1037 ifl_name = arsp->rel_isdesc->is_file->ifl_name;
1038 else
1039 ifl_name = MSG_INTL(MSG_STR_NULL);
1040
1041 /*
1042 * Make sure we have data to relocate. Compiler and assembler
1043 * developers have been known to generate relocations against
1044 * invalid sections (normally .bss), so for their benefit give
1045 * them sufficient information to help analyze the problem.
1046 * End users should never see this.
1047 */
1048 if (arsp->rel_isdesc->is_indata->d_buf == 0) {
1049 Conv_inv_buf_t inv_buf;
1050
1051 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_REL_EMPTYSEC),
1052 conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf),
1053 ifl_name, ld_reloc_sym_name(arsp),
1054 EC_WORD(arsp->rel_isdesc->is_scnndx),
1055 arsp->rel_isdesc->is_name);
1056 return (S_ERROR);
1057 }
1058
1059 /*
1060 * Get the address of the data item we need to modify.
1061 */
1062 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset +
1063 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata));
1064
1065 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD_ACT,
1066 M_MACH, SHT_RELA, arsp, EC_NATPTR(addr), value,
1067 ld_reloc_sym_name));
1068 addr += (uintptr_t)osp->os_outdata->d_buf;
1069
1070 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) >
1071 ofl->ofl_size) || (arsp->rel_roffset >
1072 osp->os_shdr->sh_size)) {
1073 int class;
1074 Conv_inv_buf_t inv_buf;
1075
1076 if (((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) >
1077 ofl->ofl_size)
1078 class = ERR_FATAL;
1079 else
1080 class = ERR_WARNING;
1081
1082 ld_eprintf(ofl, class, MSG_INTL(MSG_REL_INVALOFFSET),
1083 conv_reloc_amd64_type(arsp->rel_rtype, 0, &inv_buf),
1084 ifl_name, EC_WORD(arsp->rel_isdesc->is_scnndx),
1085 arsp->rel_isdesc->is_name, ld_reloc_sym_name(arsp),
1086 EC_ADDR((uintptr_t)addr -
1087 (uintptr_t)ofl->ofl_nehdr));
1088
1089 if (class == ERR_FATAL) {
1090 return_code = S_ERROR;
1091 continue;
1092 }
1093 }
1094
1095 /*
1096 * The relocation is additive. Ignore the previous symbol
1097 * value if this local partial symbol is expanded.
1098 */
1099 if (moved)
1100 value -= *addr;
1101
1102 /*
1103 * If '-z noreloc' is specified - skip the do_reloc_ld stage.
1104 */
1105 if (OFL_DO_RELOC(ofl)) {
1106 /*
1107 * If this is a PROGBITS section and the running linker
1108 * has a different byte order than the target host,
1109 * tell do_reloc_ld() to swap bytes.
1110 */
1111 if (do_reloc_ld(arsp, addr, &value, ld_reloc_sym_name,
1112 ifl_name, OFL_SWAP_RELOC_DATA(ofl, arsp),
1113 ofl->ofl_lml) == 0) {
1114 ofl->ofl_flags |= FLG_OF_FATAL;
1115 return_code = S_ERROR;
1116 }
1117 }
1118 }
1119 return (return_code);
1120 }
1121
1122 static uintptr_t
1123 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl)
1124 {
1125 Rel_desc *orsp;
1126 Sym_desc *sdp = rsp->rel_sym;
1127
1128 /*
1129 * Static executables *do not* want any relocations against them.
1130 * Since our engine still creates relocations against a WEAK UNDEFINED
1131 * symbol in a static executable, it's best to disable them here
1132 * instead of through out the relocation code.
1133 */
1134 if (OFL_IS_STATIC_EXEC(ofl))
1135 return (1);
1136
1137 /*
1138 * If we are adding a output relocation against a section
1139 * symbol (non-RELATIVE) then mark that section. These sections
1140 * will be added to the .dynsym symbol table.
1141 */
1142 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) &&
1143 ((flags & FLG_REL_SCNNDX) ||
1144 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) {
1145
1146 /*
1147 * If this is a COMMON symbol - no output section
1148 * exists yet - (it's created as part of sym_validate()).
1149 * So - we mark here that when it's created it should
1150 * be tagged with the FLG_OS_OUTREL flag.
1151 */
1152 if ((sdp->sd_flags & FLG_SY_SPECSEC) &&
1153 (sdp->sd_sym->st_shndx == SHN_COMMON)) {
1154 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS)
1155 ofl->ofl_flags1 |= FLG_OF1_BSSOREL;
1156 else
1157 ofl->ofl_flags1 |= FLG_OF1_TLSOREL;
1158 } else {
1159 Os_desc *osp;
1160 Is_desc *isp = sdp->sd_isc;
1161
1162 if (isp && ((osp = isp->is_osdesc) != NULL) &&
1163 ((osp->os_flags & FLG_OS_OUTREL) == 0)) {
1164 ofl->ofl_dynshdrcnt++;
1165 osp->os_flags |= FLG_OS_OUTREL;
1166 }
1167 }
1168 }
1169
1170 /* Enter it into the output relocation cache */
1171 if ((orsp = ld_reloc_enter(ofl, &ofl->ofl_outrels, rsp, flags)) == NULL)
1172 return (S_ERROR);
1173
1174 if (flags & FLG_REL_GOT)
1175 ofl->ofl_relocgotsz += (Xword)sizeof (Rela);
1176 else if (flags & FLG_REL_PLT)
1177 ofl->ofl_relocpltsz += (Xword)sizeof (Rela);
1178 else if (flags & FLG_REL_BSS)
1179 ofl->ofl_relocbsssz += (Xword)sizeof (Rela);
1180 else if (flags & FLG_REL_NOINFO)
1181 ofl->ofl_relocrelsz += (Xword)sizeof (Rela);
1182 else
1183 RELAUX_GET_OSDESC(orsp)->os_szoutrels += (Xword)sizeof (Rela);
1184
1185 if (orsp->rel_rtype == M_R_RELATIVE)
1186 ofl->ofl_relocrelcnt++;
1187
1188 /*
1189 * We don't perform sorting on PLT relocations because
1190 * they have already been assigned a PLT index and if we
1191 * were to sort them we would have to re-assign the plt indexes.
1192 */
1193 if (!(flags & FLG_REL_PLT))
1194 ofl->ofl_reloccnt++;
1195
1196 /*
1197 * Insure a GLOBAL_OFFSET_TABLE is generated if required.
1198 */
1199 if (IS_GOT_REQUIRED(orsp->rel_rtype))
1200 ofl->ofl_flags |= FLG_OF_BLDGOT;
1201
1202 /*
1203 * Identify and possibly warn of a displacement relocation.
1204 */
1205 if (orsp->rel_flags & FLG_REL_DISP) {
1206 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND;
1207
1208 if (ofl->ofl_flags & FLG_OF_VERBOSE)
1209 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl);
1210 }
1211 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_RELA,
1212 M_MACH, orsp));
1213 return (1);
1214 }
1215
1216 /*
1217 * process relocation for a LOCAL symbol
1218 */
1219 static uintptr_t
1220 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl)
1221 {
1222 ofl_flag_t flags = ofl->ofl_flags;
1223 Sym_desc *sdp = rsp->rel_sym;
1224 Word shndx = sdp->sd_sym->st_shndx;
1225 Word ortype = rsp->rel_rtype;
1226
1227 /*
1228 * if ((shared object) and (not pc relative relocation) and
1229 * (not against ABS symbol))
1230 * then
1231 * build R_AMD64_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
1242 /*
1243 * R_AMD64_RELATIVE updates a 64bit address, if this
1244 * relocation isn't a 64bit binding then we can not
1245 * simplify it to a RELATIVE relocation.
1246 */
1247 if (reloc_table[ortype].re_fsize != sizeof (Addr)) {
1248 return (ld_add_outrel(0, rsp, ofl));
1249 }
1250
1251 rsp->rel_rtype = R_AMD64_RELATIVE;
1252 if (ld_add_outrel(FLG_REL_ADVAL, rsp, ofl) == S_ERROR)
1253 return (S_ERROR);
1254 rsp->rel_rtype = ortype;
1255 return (1);
1256 }
1257
1258 /*
1259 * If the relocation is against a 'non-allocatable' section
1260 * and we can not resolve it now - then give a warning
1261 * message.
1262 *
1263 * We can not resolve the symbol if either:
1264 * a) it's undefined
1265 * b) it's defined in a shared library and a
1266 * COPY relocation hasn't moved it to the executable
1267 *
1268 * Note: because we process all of the relocations against the
1269 * text segment before any others - we know whether
1270 * or not a copy relocation will be generated before
1271 * we get here (see reloc_init()->reloc_segments()).
1272 */
1273 if (!(rsp->rel_flags & FLG_REL_LOAD) &&
1274 ((shndx == SHN_UNDEF) ||
1275 ((sdp->sd_ref == REF_DYN_NEED) &&
1276 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) {
1277 Conv_inv_buf_t inv_buf;
1278 Os_desc *osp = RELAUX_GET_OSDESC(rsp);
1279
1280 /*
1281 * If the relocation is against a SHT_SUNW_ANNOTATE
1282 * section - then silently ignore that the relocation
1283 * can not be resolved.
1284 */
1285 if (osp && (osp->os_shdr->sh_type == SHT_SUNW_ANNOTATE))
1286 return (0);
1287 ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_REL_EXTERNSYM),
1288 conv_reloc_amd64_type(rsp->rel_rtype, 0, &inv_buf),
1289 rsp->rel_isdesc->is_file->ifl_name,
1290 ld_reloc_sym_name(rsp), osp->os_name);
1291 return (1);
1292 }
1293
1294 /*
1295 * Perform relocation.
1296 */
1297 return (ld_add_actrel(NULL, rsp, ofl));
1298 }
1299
1300
1301 static uintptr_t
1302 ld_reloc_TLS(Boolean local, Rel_desc * rsp, Ofl_desc * ofl)
1303 {
1304 Word rtype = rsp->rel_rtype;
1305 Sym_desc *sdp = rsp->rel_sym;
1306 ofl_flag_t flags = ofl->ofl_flags;
1307 Gotndx *gnp;
1308
1309 /*
1310 * If we're building an executable - use either the IE or LE access
1311 * model. If we're building a shared object process any IE model.
1312 */
1313 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) {
1314 /*
1315 * Set the DF_STATIC_TLS flag.
1316 */
1317 ofl->ofl_dtflags |= DF_STATIC_TLS;
1318
1319 if (!local || ((flags & FLG_OF_EXEC) == 0)) {
1320 /*
1321 * Assign a GOT entry for static TLS references.
1322 */
1323 if ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1324 GOT_REF_TLSIE, ofl, rsp)) == NULL) {
1325
1326 if (ld_assign_got_TLS(local, rsp, ofl, sdp,
1327 gnp, GOT_REF_TLSIE, FLG_REL_STLS,
1328 rtype, R_AMD64_TPOFF64, 0) == S_ERROR)
1329 return (S_ERROR);
1330 }
1331
1332 /*
1333 * IE access model.
1334 */
1335 if (IS_TLS_IE(rtype))
1336 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl));
1337
1338 /*
1339 * Fixups are required for other executable models.
1340 */
1341 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
1342 rsp, ofl));
1343 }
1344
1345 /*
1346 * LE access model.
1347 */
1348 if (IS_TLS_LE(rtype))
1349 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl));
1350
1351 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS),
1352 rsp, ofl));
1353 }
1354
1355 /*
1356 * Building a shared object.
1357 *
1358 * Assign a GOT entry for a dynamic TLS reference.
1359 */
1360 if (IS_TLS_LD(rtype) && ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs,
1361 GOT_REF_TLSLD, ofl, rsp)) == NULL)) {
1362
1363 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD,
1364 FLG_REL_MTLS, rtype, R_AMD64_DTPMOD64, NULL) == S_ERROR)
1365 return (S_ERROR);
1366
1367 } else if (IS_TLS_GD(rtype) &&
1368 ((gnp = ld_find_got_ndx(sdp->sd_GOTndxs, GOT_REF_TLSGD,
1369 ofl, rsp)) == NULL)) {
1370
1371 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD,
1372 FLG_REL_DTLS, rtype, R_AMD64_DTPMOD64,
1373 R_AMD64_DTPOFF64) == S_ERROR)
1374 return (S_ERROR);
1375 }
1376
1377 if (IS_TLS_LD(rtype))
1378 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl));
1379
1380 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl));
1381 }
1382
1383 /* ARGSUSED5 */
1384 static uintptr_t
1385 ld_assign_got_ndx(Alist **alpp, Gotndx *pgnp, Gotref gref, Ofl_desc *ofl,
1386 Rel_desc *rsp, Sym_desc *sdp)
1387 {
1388 Xword raddend;
1389 Gotndx gn, *gnp;
1390 Aliste idx;
1391 uint_t gotents;
1392
1393 raddend = rsp->rel_raddend;
1394 if (pgnp && (pgnp->gn_addend == raddend) && (pgnp->gn_gotref == gref))
1395 return (1);
1396
1397 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD))
1398 gotents = 2;
1399 else
1400 gotents = 1;
1401
1402 gn.gn_addend = raddend;
1403 gn.gn_gotndx = ofl->ofl_gotcnt;
1404 gn.gn_gotref = gref;
1405
1406 ofl->ofl_gotcnt += gotents;
1407
1408 if (gref == GOT_REF_TLSLD) {
1409 if (ofl->ofl_tlsldgotndx == NULL) {
1410 if ((gnp = libld_malloc(sizeof (Gotndx))) == NULL)
1411 return (S_ERROR);
1412 (void) memcpy(gnp, &gn, sizeof (Gotndx));
1413 ofl->ofl_tlsldgotndx = gnp;
1414 }
1415 return (1);
1416 }
1417
1418 idx = 0;
1419 for (ALIST_TRAVERSE(*alpp, idx, gnp)) {
1420 if (gnp->gn_addend > raddend)
1421 break;
1422 }
1423
1424 /*
1425 * GOT indexes are maintained on an Alist, where there is typically
1426 * only one index. The usage of this list is to scan the list to find
1427 * an index, and then apply that index immediately to a relocation.
1428 * Thus there are no external references to these GOT index structures
1429 * that can be compromised by the Alist being reallocated.
1430 */
1431 if (alist_insert(alpp, &gn, sizeof (Gotndx),
1432 AL_CNT_SDP_GOT, idx) == NULL)
1433 return (S_ERROR);
1434
1435 return (1);
1436 }
1437
1438 static void
1439 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl)
1440 {
1441 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++;
1442 sdp->sd_aux->sa_PLTGOTndx = ofl->ofl_gotcnt++;
1443 ofl->ofl_flags |= FLG_OF_BLDGOT;
1444 }
1445
1446 static uchar_t plt0_template[M_PLT_ENTSIZE] = {
1447 /* 0x00 PUSHQ GOT+8(%rip) */ 0xff, 0x35, 0x00, 0x00, 0x00, 0x00,
1448 /* 0x06 JMP *GOT+16(%rip) */ 0xff, 0x25, 0x00, 0x00, 0x00, 0x00,
1449 /* 0x0c NOP */ 0x90,
1450 /* 0x0d NOP */ 0x90,
1451 /* 0x0e NOP */ 0x90,
1452 /* 0x0f NOP */ 0x90
1453 };
1454
1455 /*
1456 * Initializes .got[0] with the _DYNAMIC symbol value.
1457 */
1458 static uintptr_t
1459 ld_fillin_gotplt(Ofl_desc *ofl)
1460 {
1461 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0;
1462
1463 if (ofl->ofl_osgot) {
1464 Sym_desc *sdp;
1465
1466 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U),
1467 SYM_NOHASH, NULL, ofl)) != NULL) {
1468 uchar_t *genptr;
1469
1470 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf +
1471 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE));
1472 /* LINTED */
1473 *(Xword *)genptr = sdp->sd_sym->st_value;
1474 if (bswap)
1475 /* LINTED */
1476 *(Xword *)genptr =
1477 /* LINTED */
1478 ld_bswap_Xword(*(Xword *)genptr);
1479 }
1480 }
1481
1482 /*
1483 * Fill in the reserved slot in the procedure linkage table the first
1484 * entry is:
1485 * 0x00 PUSHQ GOT+8(%rip) # GOT[1]
1486 * 0x06 JMP *GOT+16(%rip) # GOT[2]
1487 * 0x0c NOP
1488 * 0x0d NOP
1489 * 0x0e NOP
1490 * 0x0f NOP
1491 */
1492 if ((ofl->ofl_flags & FLG_OF_DYNAMIC) && ofl->ofl_osplt) {
1493 uchar_t *pltent;
1494 Xword val1;
1495
1496 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf;
1497 bcopy(plt0_template, pltent, sizeof (plt0_template));
1498
1499 /*
1500 * If '-z noreloc' is specified - skip the do_reloc_ld
1501 * stage.
1502 */
1503 if (!OFL_DO_RELOC(ofl))
1504 return (1);
1505
1506 /*
1507 * filin:
1508 * PUSHQ GOT + 8(%rip)
1509 *
1510 * Note: 0x06 below represents the offset to the
1511 * next instruction - which is what %rip will
1512 * be pointing at.
1513 */
1514 val1 = (ofl->ofl_osgot->os_shdr->sh_addr) +
1515 (M_GOT_XLINKMAP * M_GOT_ENTSIZE) -
1516 ofl->ofl_osplt->os_shdr->sh_addr - 0x06;
1517
1518 if (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x02],
1519 &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT),
1520 bswap, ofl->ofl_lml) == 0) {
1521 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLT0FAIL));
1522 return (S_ERROR);
1523 }
1524
1525 /*
1526 * filin:
1527 * JMP *GOT+16(%rip)
1528 */
1529 val1 = (ofl->ofl_osgot->os_shdr->sh_addr) +
1530 (M_GOT_XRTLD * M_GOT_ENTSIZE) -
1531 ofl->ofl_osplt->os_shdr->sh_addr - 0x0c;
1532
1533 if (do_reloc_ld(&rdesc_r_amd64_gotpcrel, &pltent[0x08],
1534 &val1, syn_rdesc_sym_name, MSG_ORIG(MSG_SPECFIL_PLTENT),
1535 bswap, ofl->ofl_lml) == 0) {
1536 ld_eprintf(ofl, ERR_FATAL, MSG_INTL(MSG_PLT_PLT0FAIL));
1537 return (S_ERROR);
1538 }
1539 }
1540
1541 return (1);
1542 }
1543
1544
1545
1546 /*
1547 * Template for generating "void (*)(void)" function
1548 */
1549 static const uchar_t nullfunc_tmpl[] = { /* amd64 */
1550 /* 0x00 */ 0x55, /* pushq %rbp */
1551 /* 0x01 */ 0x48, 0x8b, 0xec, /* movq %rsp,%rbp */
1552 /* 0x04 */ 0x48, 0x8b, 0xe5, /* movq %rbp,%rsp */
1553 /* 0x07 */ 0x5d, /* popq %rbp */
1554 /* 0x08 */ 0xc3 /* ret */
1555 };
1556
1557
1558 /*
1559 * Function used to provide fill padding in SHF_EXECINSTR sections
1560 *
1561 * entry:
1562 *
1563 * base - base address of section being filled
1564 * offset - starting offset for fill within memory referenced by base
1565 * cnt - # bytes to be filled
1566 *
1567 * exit:
1568 * The fill has been completed.
1569 */
1570 static void
1571 execfill(void *base, off_t off, size_t cnt)
1572 {
1573 /*
1574 * 0x90 is an X86 NOP instruction in both 32 and 64-bit worlds.
1575 * There are no alignment constraints.
1576 */
1577 (void) memset(off + (char *)base, 0x90, cnt);
1578 }
1579
1580
1581 /*
1582 * Return the ld_targ definition for this target.
1583 */
1584 const Target *
1585 ld_targ_init_x86(void)
1586 {
1587 static const Target _ld_targ = {
1588 { /* Target_mach */
1589 M_MACH, /* m_mach */
1590 M_MACHPLUS, /* m_machplus */
1591 M_FLAGSPLUS, /* m_flagsplus */
1592 M_CLASS, /* m_class */
1593 M_DATA, /* m_data */
1594
1595 M_SEGM_ALIGN, /* m_segm_align */
1596 M_SEGM_ORIGIN, /* m_segm_origin */
1597 M_SEGM_AORIGIN, /* m_segm_aorigin */
1598 M_DATASEG_PERM, /* m_dataseg_perm */
1599 M_STACK_PERM, /* m_stack_perm */
1600 M_WORD_ALIGN, /* m_word_align */
1601 MSG_ORIG(MSG_PTH_RTLD_AMD64), /* m_def_interp */
1602
1603 /* Relocation type codes */
1604 M_R_ARRAYADDR, /* m_r_arrayaddr */
1605 M_R_COPY, /* m_r_copy */
1606 M_R_GLOB_DAT, /* m_r_glob_dat */
1607 M_R_JMP_SLOT, /* m_r_jmp_slot */
1608 M_R_NUM, /* m_r_num */
1609 M_R_NONE, /* m_r_none */
1610 M_R_RELATIVE, /* m_r_relative */
1611 M_R_REGISTER, /* m_r_register */
1612
1613 /* Relocation related constants */
1614 M_REL_DT_COUNT, /* m_rel_dt_count */
1615 M_REL_DT_ENT, /* m_rel_dt_ent */
1616 M_REL_DT_SIZE, /* m_rel_dt_size */
1617 M_REL_DT_TYPE, /* m_rel_dt_type */
1618 M_REL_SHT_TYPE, /* m_rel_sht_type */
1619
1620 /* GOT related constants */
1621 M_GOT_ENTSIZE, /* m_got_entsize */
1622 M_GOT_XNumber, /* m_got_xnumber */
1623
1624 /* PLT related constants */
1625 M_PLT_ALIGN, /* m_plt_align */
1626 M_PLT_ENTSIZE, /* m_plt_entsize */
1627 M_PLT_RESERVSZ, /* m_plt_reservsz */
1628 M_PLT_SHF_FLAGS, /* m_plt_shf_flags */
1629
1630 /* Section type of .eh_frame/.eh_frame_hdr sections */
1631 SHT_AMD64_UNWIND, /* m_sht_unwind */
1632
1633 M_DT_REGISTER, /* m_dt_register */
1634 },
1635 { /* Target_machid */
1636 M_ID_ARRAY, /* id_array */
1637 M_ID_BSS, /* id_bss */
1638 M_ID_CAP, /* id_cap */
1639 M_ID_CAPINFO, /* id_capinfo */
1640 M_ID_CAPCHAIN, /* id_capchain */
1641 M_ID_DATA, /* id_data */
1642 M_ID_DYNAMIC, /* id_dynamic */
1643 M_ID_DYNSORT, /* id_dynsort */
1644 M_ID_DYNSTR, /* id_dynstr */
1645 M_ID_DYNSYM, /* id_dynsym */
1646 M_ID_DYNSYM_NDX, /* id_dynsym_ndx */
1647 M_ID_GOT, /* id_got */
1648 M_ID_UNKNOWN, /* id_gotdata (unused) */
1649 M_ID_HASH, /* id_hash */
1650 M_ID_INTERP, /* id_interp */
1651 M_ID_LBSS, /* id_lbss */
1652 M_ID_LDYNSYM, /* id_ldynsym */
1653 M_ID_NOTE, /* id_note */
1654 M_ID_NULL, /* id_null */
1655 M_ID_PLT, /* id_plt */
1656 M_ID_REL, /* id_rel */
1657 M_ID_STRTAB, /* id_strtab */
1658 M_ID_SYMINFO, /* id_syminfo */
1659 M_ID_SYMTAB, /* id_symtab */
1660 M_ID_SYMTAB_NDX, /* id_symtab_ndx */
1661 M_ID_TEXT, /* id_text */
1662 M_ID_TLS, /* id_tls */
1663 M_ID_TLSBSS, /* id_tlsbss */
1664 M_ID_UNKNOWN, /* id_unknown */
1665 M_ID_UNWIND, /* id_unwind */
1666 M_ID_UNWINDHDR, /* id_unwindhdr */
1667 M_ID_USER, /* id_user */
1668 M_ID_VERSION, /* id_version */
1669 },
1670 { /* Target_nullfunc */
1671 nullfunc_tmpl, /* nf_template */
1672 sizeof (nullfunc_tmpl), /* nf_size */
1673 },
1674 { /* Target_fillfunc */
1675 execfill /* ff_execfill */
1676 },
1677 { /* Target_machrel */
1678 reloc_table,
1679
1680 ld_init_rel, /* mr_init_rel */
1681 ld_mach_eflags, /* mr_mach_eflags */
1682 ld_mach_make_dynamic, /* mr_mach_make_dynamic */
1683 ld_mach_update_odynamic, /* mr_mach_update_odynamic */
1684 ld_calc_plt_addr, /* mr_calc_plt_addr */
1685 ld_perform_outreloc, /* mr_perform_outreloc */
1686 ld_do_activerelocs, /* mr_do_activerelocs */
1687 ld_add_outrel, /* mr_add_outrel */
1688 NULL, /* mr_reloc_register */
1689 ld_reloc_local, /* mr_reloc_local */
1690 NULL, /* mr_reloc_GOTOP */
1691 ld_reloc_TLS, /* mr_reloc_TLS */
1692 NULL, /* mr_assign_got */
1693 ld_find_got_ndx, /* mr_find_got_ndx */
1694 ld_calc_got_offset, /* mr_calc_got_offset */
1695 ld_assign_got_ndx, /* mr_assign_got_ndx */
1696 ld_assign_plt_ndx, /* mr_assign_plt_ndx */
1697 NULL, /* mr_allocate_got */
1698 ld_fillin_gotplt, /* mr_fillin_gotplt */
1699 },
1700 { /* Target_machsym */
1701 NULL, /* ms_reg_check */
1702 NULL, /* ms_mach_sym_typecheck */
1703 NULL, /* ms_is_regsym */
1704 NULL, /* ms_reg_find */
1705 NULL /* ms_reg_enter */
1706 }
1707 };
1708
1709 return (&_ld_targ);
1710 }