1 /* $NetBSD: ppc_reloc.c,v 1.10 2001/09/10 06:09:41 mycroft Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (C) 1998 Tsubai Masanari
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/mman.h>
34 #include <sys/sysctl.h>
35
36 #include <errno.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41 #include <machine/cpu.h>
42 #include <machine/md_var.h>
43
44 #include "debug.h"
45 #include "rtld.h"
46
47 #if !defined(_CALL_ELF) || _CALL_ELF == 1
48 struct funcdesc {
49 Elf_Addr addr;
50 Elf_Addr toc;
51 Elf_Addr env;
52 };
53 #endif
54
55 bool
arch_digest_dynamic(struct Struct_Obj_Entry * obj,const Elf_Dyn * dynp)56 arch_digest_dynamic(struct Struct_Obj_Entry *obj, const Elf_Dyn *dynp)
57 {
58 if (dynp->d_tag == DT_PPC64_GLINK) {
59 obj->glink = (Elf_Addr)(obj->relocbase + dynp->d_un.d_ptr);
60 return (true);
61 }
62
63 return (false);
64 }
65
66 /*
67 * Process the R_PPC_COPY relocations
68 */
69 int
do_copy_relocations(Obj_Entry * dstobj)70 do_copy_relocations(Obj_Entry *dstobj)
71 {
72 const Elf_Rela *relalim;
73 const Elf_Rela *rela;
74
75 /*
76 * COPY relocs are invalid outside of the main program
77 */
78 assert(dstobj->mainprog);
79
80 relalim = (const Elf_Rela *)((const char *) dstobj->rela +
81 dstobj->relasize);
82 for (rela = dstobj->rela; rela < relalim; rela++) {
83 void *dstaddr;
84 const Elf_Sym *dstsym;
85 const char *name;
86 size_t size;
87 const void *srcaddr;
88 const Elf_Sym *srcsym = NULL;
89 const Obj_Entry *srcobj, *defobj;
90 SymLook req;
91 int res;
92
93 if (ELF_R_TYPE(rela->r_info) != R_PPC_COPY) {
94 continue;
95 }
96
97 dstaddr = (void *)(dstobj->relocbase + rela->r_offset);
98 dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info);
99 name = dstobj->strtab + dstsym->st_name;
100 size = dstsym->st_size;
101 symlook_init(&req, name);
102 req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rela->r_info));
103 req.flags = SYMLOOK_EARLY;
104
105 for (srcobj = globallist_next(dstobj); srcobj != NULL;
106 srcobj = globallist_next(srcobj)) {
107 res = symlook_obj(&req, srcobj);
108 if (res == 0) {
109 srcsym = req.sym_out;
110 defobj = req.defobj_out;
111 break;
112 }
113 }
114
115 if (srcobj == NULL) {
116 _rtld_error("Undefined symbol \"%s\" "
117 " referenced from COPY"
118 " relocation in %s", name, dstobj->path);
119 return (-1);
120 }
121
122 srcaddr = (const void *)(defobj->relocbase+srcsym->st_value);
123 memcpy(dstaddr, srcaddr, size);
124 dbg("copy_reloc: src=%p,dst=%p,size=%zd\n",srcaddr,dstaddr,size);
125 }
126
127 return (0);
128 }
129
130
131 /*
132 * Perform early relocation of the run-time linker image
133 */
134 void
reloc_non_plt_self(Elf_Dyn * dynp,Elf_Addr relocbase)135 reloc_non_plt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
136 {
137 const Elf_Rela *rela = NULL, *relalim;
138 Elf_Addr relasz = 0;
139 Elf_Addr *where;
140
141 /*
142 * Extract the rela/relasz values from the dynamic section
143 */
144 for (; dynp->d_tag != DT_NULL; dynp++) {
145 switch (dynp->d_tag) {
146 case DT_RELA:
147 rela = (const Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
148 break;
149 case DT_RELASZ:
150 relasz = dynp->d_un.d_val;
151 break;
152 }
153 }
154
155 /*
156 * Relocate these values
157 */
158 relalim = (const Elf_Rela *)((const char *)rela + relasz);
159 for (; rela < relalim; rela++) {
160 where = (Elf_Addr *)(relocbase + rela->r_offset);
161 *where = (Elf_Addr)(relocbase + rela->r_addend);
162 }
163 }
164
165
166 /*
167 * Relocate a non-PLT object with addend.
168 */
169 static int
reloc_nonplt_object(Obj_Entry * obj_rtld __unused,Obj_Entry * obj,const Elf_Rela * rela,SymCache * cache,int flags,RtldLockState * lockstate)170 reloc_nonplt_object(Obj_Entry *obj_rtld __unused, Obj_Entry *obj,
171 const Elf_Rela *rela, SymCache *cache, int flags, RtldLockState *lockstate)
172 {
173 const Elf_Sym *def = NULL;
174 const Obj_Entry *defobj;
175 Elf_Addr *where, symval = 0;
176
177 /*
178 * First, resolve symbol for relocations which
179 * reference symbols.
180 */
181 switch (ELF_R_TYPE(rela->r_info)) {
182
183 case R_PPC64_UADDR64: /* doubleword64 S + A */
184 case R_PPC64_ADDR64:
185 case R_PPC_GLOB_DAT:
186 case R_PPC64_DTPMOD64:
187 case R_PPC64_TPREL64:
188 case R_PPC64_DTPREL64:
189 def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
190 flags, cache, lockstate);
191 if (def == NULL) {
192 return (-1);
193 }
194 /*
195 * If symbol is IFUNC, only perform relocation
196 * when caller allowed it by passing
197 * SYMLOOK_IFUNC flag. Skip the relocations
198 * otherwise.
199 *
200 * Also error out in case IFUNC relocations
201 * are specified for TLS, which cannot be
202 * usefully interpreted.
203 */
204 if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
205 switch (ELF_R_TYPE(rela->r_info)) {
206 case R_PPC64_UADDR64:
207 case R_PPC64_ADDR64:
208 case R_PPC_GLOB_DAT:
209 if ((flags & SYMLOOK_IFUNC) == 0) {
210 dbg("Non-PLT reference to IFUNC found!");
211 obj->non_plt_gnu_ifunc = true;
212 return (0);
213 }
214 symval = (Elf_Addr)rtld_resolve_ifunc(
215 defobj, def);
216 break;
217 default:
218 _rtld_error("%s: IFUNC for TLS reloc",
219 obj->path);
220 return (-1);
221 }
222 } else {
223 if ((flags & SYMLOOK_IFUNC) != 0)
224 return (0);
225 symval = (Elf_Addr)defobj->relocbase +
226 def->st_value;
227 }
228 break;
229 default:
230 if ((flags & SYMLOOK_IFUNC) != 0)
231 return (0);
232 }
233
234 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
235
236 switch (ELF_R_TYPE(rela->r_info)) {
237 case R_PPC_NONE:
238 break;
239 case R_PPC64_UADDR64:
240 case R_PPC64_ADDR64:
241 case R_PPC_GLOB_DAT:
242 /* Don't issue write if unnecessary; avoid COW page fault */
243 if (*where != symval + rela->r_addend) {
244 *where = symval + rela->r_addend;
245 }
246 break;
247 case R_PPC64_DTPMOD64:
248 *where = (Elf_Addr) defobj->tlsindex;
249 break;
250 case R_PPC64_TPREL64:
251 /*
252 * We lazily allocate offsets for static TLS as we
253 * see the first relocation that references the
254 * TLS block. This allows us to support (small
255 * amounts of) static TLS in dynamically loaded
256 * modules. If we run out of space, we generate an
257 * error.
258 */
259 if (!defobj->tls_static) {
260 if (!allocate_tls_offset(
261 __DECONST(Obj_Entry *, defobj))) {
262 _rtld_error("%s: No space available for static "
263 "Thread Local Storage", obj->path);
264 return (-1);
265 }
266 }
267
268 *(Elf_Addr **)where = *where * sizeof(Elf_Addr)
269 + (Elf_Addr *)(def->st_value + rela->r_addend
270 + defobj->tlsoffset - TLS_TP_OFFSET - TLS_TCB_SIZE);
271 break;
272 case R_PPC64_DTPREL64:
273 *where += (Elf_Addr)(def->st_value + rela->r_addend
274 - TLS_DTV_OFFSET);
275 break;
276 case R_PPC_RELATIVE: /* doubleword64 B + A */
277 symval = (Elf_Addr)(obj->relocbase + rela->r_addend);
278
279 /* As above, don't issue write unnecessarily */
280 if (*where != symval) {
281 *where = symval;
282 }
283 break;
284 case R_PPC_COPY:
285 /*
286 * These are deferred until all other relocations
287 * have been done. All we do here is make sure
288 * that the COPY relocation is not in a shared
289 * library. They are allowed only in executable
290 * files.
291 */
292 if (!obj->mainprog) {
293 _rtld_error("%s: Unexpected R_COPY "
294 " relocation in shared library",
295 obj->path);
296 return (-1);
297 }
298 break;
299 case R_PPC_IRELATIVE:
300 /*
301 * These will be handled by reloc_iresolve().
302 */
303 obj->irelative = true;
304 break;
305 case R_PPC_JMP_SLOT:
306 /*
307 * These will be handled by the plt/jmpslot routines
308 */
309 break;
310
311 default:
312 _rtld_error("%s: Unsupported relocation type %ld"
313 " in non-PLT relocations\n", obj->path,
314 ELF_R_TYPE(rela->r_info));
315 return (-1);
316 }
317 return (0);
318 }
319
320
321 /*
322 * Process non-PLT relocations
323 */
324 int
reloc_non_plt(Obj_Entry * obj,Obj_Entry * obj_rtld,int flags,RtldLockState * lockstate)325 reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags,
326 RtldLockState *lockstate)
327 {
328 const Elf_Rela *relalim;
329 const Elf_Rela *rela;
330 const Elf_Phdr *phdr;
331 SymCache *cache;
332 int bytes = obj->dynsymcount * sizeof(SymCache);
333 int r = -1;
334
335 /*
336 * The dynamic loader may be called from a thread, we have
337 * limited amounts of stack available so we cannot use alloca().
338 */
339 if (obj != obj_rtld) {
340 cache = mmap(NULL, bytes, PROT_READ|PROT_WRITE, MAP_ANON,
341 -1, 0);
342 if (cache == MAP_FAILED)
343 cache = NULL;
344 } else
345 cache = NULL;
346
347 /*
348 * From the SVR4 PPC ABI:
349 * "The PowerPC family uses only the Elf32_Rela relocation
350 * entries with explicit addends."
351 */
352 relalim = (const Elf_Rela *)((const char *)obj->rela + obj->relasize);
353 for (rela = obj->rela; rela < relalim; rela++) {
354 if (reloc_nonplt_object(obj_rtld, obj, rela, cache, flags,
355 lockstate) < 0)
356 goto done;
357 }
358 r = 0;
359 done:
360 if (cache)
361 munmap(cache, bytes);
362
363 /*
364 * Synchronize icache for executable segments in case we made
365 * any changes.
366 */
367 for (phdr = obj->phdr;
368 (const char *)phdr < (const char *)obj->phdr + obj->phsize;
369 phdr++) {
370 if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X) != 0) {
371 __syncicache(obj->relocbase + phdr->p_vaddr,
372 phdr->p_memsz);
373 }
374 }
375
376 return (r);
377 }
378
379
380 /*
381 * Initialise a PLT slot to the resolving trampoline
382 */
383 static int
reloc_plt_object(Obj_Entry * obj,const Elf_Rela * rela)384 reloc_plt_object(Obj_Entry *obj, const Elf_Rela *rela)
385 {
386 Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
387 long reloff;
388
389 reloff = rela - obj->pltrela;
390
391 dbg(" reloc_plt_object: where=%p,reloff=%lx,glink=%#lx", (void *)where,
392 reloff, obj->glink);
393
394 #if !defined(_CALL_ELF) || _CALL_ELF == 1
395 /* Glink code is 3 instructions after the first 32k, 2 before */
396 *where = (Elf_Addr)obj->glink + 32 +
397 8*((reloff < 0x8000) ? reloff : 0x8000) +
398 12*((reloff < 0x8000) ? 0 : (reloff - 0x8000));
399 #else
400 /* 64-Bit ELF V2 ABI Specification, sec. 4.2.5.3. */
401 *where = (Elf_Addr)obj->glink + 4*reloff + 32;
402 #endif
403
404 return (0);
405 }
406
407 /*
408 * Process the PLT relocations.
409 */
410 int
reloc_plt(Obj_Entry * obj,int flags __unused,RtldLockState * lockstate __unused)411 reloc_plt(Obj_Entry *obj, int flags __unused, RtldLockState *lockstate __unused)
412 {
413 const Elf_Rela *relalim;
414 const Elf_Rela *rela;
415
416 if (obj->pltrelasize != 0) {
417 relalim = (const Elf_Rela *)((const char *)obj->pltrela +
418 obj->pltrelasize);
419 for (rela = obj->pltrela; rela < relalim; rela++) {
420
421 #if defined(_CALL_ELF) && _CALL_ELF == 2
422 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
423 dbg("ABI violation - found IRELATIVE in the PLT.");
424 obj->irelative = true;
425 continue;
426 }
427 #endif
428 /*
429 * PowerPC(64) .rela.plt is composed of an array of
430 * R_PPC_JMP_SLOT relocations. Unlike other platforms,
431 * this is the ONLY relocation type that is valid here.
432 */
433 assert(ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT);
434
435 if (reloc_plt_object(obj, rela) < 0) {
436 return (-1);
437 }
438 }
439 }
440
441 return (0);
442 }
443
444 /*
445 * LD_BIND_NOW was set - force relocation for all jump slots
446 */
447 int
reloc_jmpslots(Obj_Entry * obj,int flags,RtldLockState * lockstate)448 reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate)
449 {
450 const Obj_Entry *defobj;
451 const Elf_Rela *relalim;
452 const Elf_Rela *rela;
453 const Elf_Sym *def;
454 Elf_Addr *where;
455 Elf_Addr target;
456
457 relalim = (const Elf_Rela *)((const char *)obj->pltrela +
458 obj->pltrelasize);
459 for (rela = obj->pltrela; rela < relalim; rela++) {
460 /* This isn't actually a jump slot, ignore it. */
461 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE)
462 continue;
463 assert(ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT);
464 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
465 def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
466 SYMLOOK_IN_PLT | flags, NULL, lockstate);
467 if (def == NULL) {
468 dbg("reloc_jmpslots: sym not found");
469 return (-1);
470 }
471
472 target = (Elf_Addr)(defobj->relocbase + def->st_value);
473
474 if (def == &sym_zero) {
475 /* Zero undefined weak symbols */
476 #if !defined(_CALL_ELF) || _CALL_ELF == 1
477 bzero(where, sizeof(struct funcdesc));
478 #else
479 *where = 0;
480 #endif
481 } else {
482 if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
483 /* LD_BIND_NOW, ifunc in shared lib.*/
484 obj->gnu_ifunc = true;
485 continue;
486 }
487 reloc_jmpslot(where, target, defobj, obj,
488 (const Elf_Rel *) rela);
489 }
490 }
491
492 obj->jmpslots_done = true;
493
494 return (0);
495 }
496
497
498 /*
499 * Update the value of a PLT jump slot.
500 */
501 Elf_Addr
reloc_jmpslot(Elf_Addr * wherep,Elf_Addr target,const Obj_Entry * defobj __unused,const Obj_Entry * obj __unused,const Elf_Rel * rel __unused)502 reloc_jmpslot(Elf_Addr *wherep, Elf_Addr target, const Obj_Entry *defobj __unused,
503 const Obj_Entry *obj __unused, const Elf_Rel *rel __unused)
504 {
505
506 /*
507 * At the PLT entry pointed at by `wherep', construct
508 * a direct transfer to the now fully resolved function
509 * address.
510 */
511
512 #if !defined(_CALL_ELF) || _CALL_ELF == 1
513 dbg(" reloc_jmpslot: where=%p, target=%p (%#lx + %#lx)",
514 (void *)wherep, (void *)target, *(Elf_Addr *)target,
515 (Elf_Addr)defobj->relocbase);
516
517 if (ld_bind_not)
518 goto out;
519
520 /*
521 * For the trampoline, the second two elements of the function
522 * descriptor are unused, so we are fine replacing those at any time
523 * with the real ones with no thread safety implications. However, we
524 * need to make sure the main entry point pointer ([0]) is seen to be
525 * modified *after* the second two elements. This can't be done in
526 * general, since there are no barriers in the reading code, but put in
527 * some isyncs to at least make it a little better.
528 */
529 memcpy(wherep, (void *)target, sizeof(struct funcdesc));
530 wherep[2] = ((Elf_Addr *)target)[2];
531 wherep[1] = ((Elf_Addr *)target)[1];
532 __asm __volatile ("isync" : : : "memory");
533 wherep[0] = ((Elf_Addr *)target)[0];
534 __asm __volatile ("isync" : : : "memory");
535
536 if (((struct funcdesc *)(wherep))->addr < (Elf_Addr)defobj->relocbase) {
537 /*
538 * It is possible (LD_BIND_NOW) that the function
539 * descriptor we are copying has not yet been relocated.
540 * If this happens, fix it. Don't worry about threading in
541 * this case since LD_BIND_NOW makes it irrelevant.
542 */
543
544 ((struct funcdesc *)(wherep))->addr +=
545 (Elf_Addr)defobj->relocbase;
546 ((struct funcdesc *)(wherep))->toc +=
547 (Elf_Addr)defobj->relocbase;
548 }
549 #else
550 dbg(" reloc_jmpslot: where=%p, target=%p", (void *)wherep,
551 (void *)target);
552
553 assert(target >= (Elf_Addr)defobj->relocbase);
554
555 if (ld_bind_not)
556 goto out;
557
558 if (*wherep != target)
559 *wherep = target;
560
561 #endif
562 out:
563
564 return (target);
565 }
566
567 int
reloc_iresolve(Obj_Entry * obj,struct Struct_RtldLockState * lockstate)568 reloc_iresolve(Obj_Entry *obj,
569 struct Struct_RtldLockState *lockstate)
570 {
571 /*
572 * Since PLT slots on PowerPC64 are always R_PPC_JMP_SLOT,
573 * R_PPC_IRELATIVE is in RELA.
574 */
575 #if !defined(_CALL_ELF) || _CALL_ELF == 1
576 (void)(obj);
577 (void)(lockstate);
578 /* XXX not implemented */
579 return (0);
580 #else
581 const Elf_Rela *relalim;
582 const Elf_Rela *rela;
583 Elf_Addr *where, target, *ptr;
584
585 if (!obj->irelative)
586 return (0);
587
588 relalim = (const Elf_Rela *)((const char *)obj->rela + obj->relasize);
589 for (rela = obj->rela; rela < relalim; rela++) {
590 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
591 ptr = (Elf_Addr *)(obj->relocbase + rela->r_addend);
592 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
593
594 lock_release(rtld_bind_lock, lockstate);
595 target = call_ifunc_resolver(ptr);
596 wlock_acquire(rtld_bind_lock, lockstate);
597
598 *where = target;
599 }
600 }
601 /*
602 * XXX Remove me when lld is fixed!
603 * LLD currently makes illegal relocations in the PLT.
604 */
605 relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
606 for (rela = obj->pltrela; rela < relalim; rela++) {
607 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
608 ptr = (Elf_Addr *)(obj->relocbase + rela->r_addend);
609 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
610
611 lock_release(rtld_bind_lock, lockstate);
612 target = call_ifunc_resolver(ptr);
613 wlock_acquire(rtld_bind_lock, lockstate);
614
615 *where = target;
616 }
617 }
618
619 obj->irelative = false;
620 return (0);
621 #endif
622 }
623
624 int
reloc_gnu_ifunc(Obj_Entry * obj __unused,int flags __unused,struct Struct_RtldLockState * lockstate __unused)625 reloc_gnu_ifunc(Obj_Entry *obj __unused, int flags __unused,
626 struct Struct_RtldLockState *lockstate __unused)
627 {
628 #if !defined(_CALL_ELF) || _CALL_ELF == 1
629 _rtld_error("reloc_gnu_ifunc(): Not implemented!");
630 /* XXX not implemented */
631 return (-1);
632 #else
633
634 const Elf_Rela *relalim;
635 const Elf_Rela *rela;
636 Elf_Addr *where, target;
637 const Elf_Sym *def;
638 const Obj_Entry *defobj;
639
640 if (!obj->gnu_ifunc)
641 return (0);
642 relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
643 for (rela = obj->pltrela; rela < relalim; rela++) {
644 if (ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT) {
645 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
646 def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
647 SYMLOOK_IN_PLT | flags, NULL, lockstate);
648 if (def == NULL)
649 return (-1);
650 if (ELF_ST_TYPE(def->st_info) != STT_GNU_IFUNC)
651 continue;
652 lock_release(rtld_bind_lock, lockstate);
653 target = (Elf_Addr)rtld_resolve_ifunc(defobj, def);
654 wlock_acquire(rtld_bind_lock, lockstate);
655 reloc_jmpslot(where, target, defobj, obj,
656 (const Elf_Rel *)rela);
657 }
658 }
659 obj->gnu_ifunc = false;
660 return (0);
661 #endif
662 }
663
664 int
reloc_iresolve_nonplt(Obj_Entry * obj __unused,struct Struct_RtldLockState * lockstate __unused)665 reloc_iresolve_nonplt(Obj_Entry *obj __unused,
666 struct Struct_RtldLockState *lockstate __unused)
667 {
668 return (0);
669 }
670
671 void
init_pltgot(Obj_Entry * obj)672 init_pltgot(Obj_Entry *obj)
673 {
674 Elf_Addr *pltcall;
675
676 pltcall = obj->pltgot;
677
678 if (pltcall == NULL) {
679 return;
680 }
681
682 #if defined(_CALL_ELF) && _CALL_ELF == 2
683 pltcall[0] = (Elf_Addr)&_rtld_bind_start;
684 pltcall[1] = (Elf_Addr)obj;
685 #else
686 memcpy(pltcall, _rtld_bind_start, sizeof(struct funcdesc));
687 pltcall[2] = (Elf_Addr)obj;
688 #endif
689 }
690
691 /*
692 * Actual values are 32 bit.
693 */
694 u_long cpu_features;
695 u_long cpu_features2;
696
697 void
powerpc64_abi_variant_hook(Elf_Auxinfo ** aux_info)698 powerpc64_abi_variant_hook(Elf_Auxinfo** aux_info)
699 {
700 /*
701 * Since aux_info[] is easier to work with than aux, go ahead and
702 * initialize cpu_features / cpu_features2.
703 */
704 cpu_features = -1UL;
705 cpu_features2 = -1UL;
706 if (aux_info[AT_HWCAP] != NULL)
707 cpu_features = (uint32_t)aux_info[AT_HWCAP]->a_un.a_val;
708 if (aux_info[AT_HWCAP2] != NULL)
709 cpu_features2 = (uint32_t)aux_info[AT_HWCAP2]->a_un.a_val;
710 }
711
712 void
ifunc_init(Elf_Auxinfo aux_info[__min_size (AT_COUNT)]__unused)713 ifunc_init(Elf_Auxinfo aux_info[__min_size(AT_COUNT)] __unused)
714 {
715
716 }
717
718 void
allocate_initial_tls(Obj_Entry * list)719 allocate_initial_tls(Obj_Entry *list)
720 {
721
722 /*
723 * Fix the size of the static TLS block by using the maximum
724 * offset allocated so far and adding a bit for dynamic modules to
725 * use.
726 */
727
728 tls_static_space = tls_last_offset + tls_last_size +
729 ld_static_tls_extra;
730
731 _tcb_set(allocate_tls(list, NULL, TLS_TCB_SIZE, TLS_TCB_ALIGN));
732 }
733
734 void*
__tls_get_addr(tls_index * ti)735 __tls_get_addr(tls_index* ti)
736 {
737 uintptr_t **dtvp;
738 char *p;
739
740 dtvp = &_tcb_get()->tcb_dtv;
741 p = tls_get_addr_common(dtvp, ti->ti_module, ti->ti_offset);
742
743 return (p + TLS_DTV_OFFSET);
744 }
745