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 SymCache *cache;
331 int bytes = obj->dynsymcount * sizeof(SymCache);
332 int r = -1;
333
334 /*
335 * The dynamic loader may be called from a thread, we have
336 * limited amounts of stack available so we cannot use alloca().
337 */
338 if (obj != obj_rtld) {
339 cache = mmap(NULL, bytes, PROT_READ|PROT_WRITE, MAP_ANON,
340 -1, 0);
341 if (cache == MAP_FAILED)
342 cache = NULL;
343 } else
344 cache = NULL;
345
346 /*
347 * From the SVR4 PPC ABI:
348 * "The PowerPC family uses only the Elf32_Rela relocation
349 * entries with explicit addends."
350 */
351 relalim = (const Elf_Rela *)((const char *)obj->rela + obj->relasize);
352 for (rela = obj->rela; rela < relalim; rela++) {
353 if (reloc_nonplt_object(obj_rtld, obj, rela, cache, flags,
354 lockstate) < 0)
355 goto done;
356 }
357 r = 0;
358 done:
359 if (cache)
360 munmap(cache, bytes);
361 return (r);
362 }
363
364
365 /*
366 * Initialise a PLT slot to the resolving trampoline
367 */
368 static int
reloc_plt_object(Obj_Entry * obj,const Elf_Rela * rela)369 reloc_plt_object(Obj_Entry *obj, const Elf_Rela *rela)
370 {
371 Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
372 long reloff;
373
374 reloff = rela - obj->pltrela;
375
376 dbg(" reloc_plt_object: where=%p,reloff=%lx,glink=%#lx", (void *)where,
377 reloff, obj->glink);
378
379 #if !defined(_CALL_ELF) || _CALL_ELF == 1
380 /* Glink code is 3 instructions after the first 32k, 2 before */
381 *where = (Elf_Addr)obj->glink + 32 +
382 8*((reloff < 0x8000) ? reloff : 0x8000) +
383 12*((reloff < 0x8000) ? 0 : (reloff - 0x8000));
384 #else
385 /* 64-Bit ELF V2 ABI Specification, sec. 4.2.5.3. */
386 *where = (Elf_Addr)obj->glink + 4*reloff + 32;
387 #endif
388
389 return (0);
390 }
391
392 /*
393 * Process the PLT relocations.
394 */
395 int
reloc_plt(Obj_Entry * obj,int flags __unused,RtldLockState * lockstate __unused)396 reloc_plt(Obj_Entry *obj, int flags __unused, RtldLockState *lockstate __unused)
397 {
398 const Elf_Rela *relalim;
399 const Elf_Rela *rela;
400
401 if (obj->pltrelasize != 0) {
402 relalim = (const Elf_Rela *)((const char *)obj->pltrela +
403 obj->pltrelasize);
404 for (rela = obj->pltrela; rela < relalim; rela++) {
405
406 #if defined(_CALL_ELF) && _CALL_ELF == 2
407 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
408 dbg("ABI violation - found IRELATIVE in the PLT.");
409 obj->irelative = true;
410 continue;
411 }
412 #endif
413 /*
414 * PowerPC(64) .rela.plt is composed of an array of
415 * R_PPC_JMP_SLOT relocations. Unlike other platforms,
416 * this is the ONLY relocation type that is valid here.
417 */
418 assert(ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT);
419
420 if (reloc_plt_object(obj, rela) < 0) {
421 return (-1);
422 }
423 }
424 }
425
426 return (0);
427 }
428
429 /*
430 * LD_BIND_NOW was set - force relocation for all jump slots
431 */
432 int
reloc_jmpslots(Obj_Entry * obj,int flags,RtldLockState * lockstate)433 reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate)
434 {
435 const Obj_Entry *defobj;
436 const Elf_Rela *relalim;
437 const Elf_Rela *rela;
438 const Elf_Sym *def;
439 Elf_Addr *where;
440 Elf_Addr target;
441
442 relalim = (const Elf_Rela *)((const char *)obj->pltrela +
443 obj->pltrelasize);
444 for (rela = obj->pltrela; rela < relalim; rela++) {
445 /* This isn't actually a jump slot, ignore it. */
446 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE)
447 continue;
448 assert(ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT);
449 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
450 def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
451 SYMLOOK_IN_PLT | flags, NULL, lockstate);
452 if (def == NULL) {
453 dbg("reloc_jmpslots: sym not found");
454 return (-1);
455 }
456
457 target = (Elf_Addr)(defobj->relocbase + def->st_value);
458
459 if (def == &sym_zero) {
460 /* Zero undefined weak symbols */
461 #if !defined(_CALL_ELF) || _CALL_ELF == 1
462 bzero(where, sizeof(struct funcdesc));
463 #else
464 *where = 0;
465 #endif
466 } else {
467 if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
468 /* LD_BIND_NOW, ifunc in shared lib.*/
469 obj->gnu_ifunc = true;
470 continue;
471 }
472 reloc_jmpslot(where, target, defobj, obj,
473 (const Elf_Rel *) rela);
474 }
475 }
476
477 obj->jmpslots_done = true;
478
479 return (0);
480 }
481
482
483 /*
484 * Update the value of a PLT jump slot.
485 */
486 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)487 reloc_jmpslot(Elf_Addr *wherep, Elf_Addr target, const Obj_Entry *defobj __unused,
488 const Obj_Entry *obj __unused, const Elf_Rel *rel __unused)
489 {
490
491 /*
492 * At the PLT entry pointed at by `wherep', construct
493 * a direct transfer to the now fully resolved function
494 * address.
495 */
496
497 #if !defined(_CALL_ELF) || _CALL_ELF == 1
498 dbg(" reloc_jmpslot: where=%p, target=%p (%#lx + %#lx)",
499 (void *)wherep, (void *)target, *(Elf_Addr *)target,
500 (Elf_Addr)defobj->relocbase);
501
502 if (ld_bind_not)
503 goto out;
504
505 /*
506 * For the trampoline, the second two elements of the function
507 * descriptor are unused, so we are fine replacing those at any time
508 * with the real ones with no thread safety implications. However, we
509 * need to make sure the main entry point pointer ([0]) is seen to be
510 * modified *after* the second two elements. This can't be done in
511 * general, since there are no barriers in the reading code, but put in
512 * some isyncs to at least make it a little better.
513 */
514 memcpy(wherep, (void *)target, sizeof(struct funcdesc));
515 wherep[2] = ((Elf_Addr *)target)[2];
516 wherep[1] = ((Elf_Addr *)target)[1];
517 __asm __volatile ("isync" : : : "memory");
518 wherep[0] = ((Elf_Addr *)target)[0];
519 __asm __volatile ("isync" : : : "memory");
520
521 if (((struct funcdesc *)(wherep))->addr < (Elf_Addr)defobj->relocbase) {
522 /*
523 * It is possible (LD_BIND_NOW) that the function
524 * descriptor we are copying has not yet been relocated.
525 * If this happens, fix it. Don't worry about threading in
526 * this case since LD_BIND_NOW makes it irrelevant.
527 */
528
529 ((struct funcdesc *)(wherep))->addr +=
530 (Elf_Addr)defobj->relocbase;
531 ((struct funcdesc *)(wherep))->toc +=
532 (Elf_Addr)defobj->relocbase;
533 }
534 #else
535 dbg(" reloc_jmpslot: where=%p, target=%p", (void *)wherep,
536 (void *)target);
537
538 assert(target >= (Elf_Addr)defobj->relocbase);
539
540 if (ld_bind_not)
541 goto out;
542
543 if (*wherep != target)
544 *wherep = target;
545
546 #endif
547 out:
548
549 return (target);
550 }
551
552 int
reloc_iresolve(Obj_Entry * obj,struct Struct_RtldLockState * lockstate)553 reloc_iresolve(Obj_Entry *obj,
554 struct Struct_RtldLockState *lockstate)
555 {
556 /*
557 * Since PLT slots on PowerPC64 are always R_PPC_JMP_SLOT,
558 * R_PPC_IRELATIVE is in RELA.
559 */
560 #if !defined(_CALL_ELF) || _CALL_ELF == 1
561 (void)(obj);
562 (void)(lockstate);
563 /* XXX not implemented */
564 return (0);
565 #else
566 const Elf_Rela *relalim;
567 const Elf_Rela *rela;
568 Elf_Addr *where, target, *ptr;
569
570 if (!obj->irelative)
571 return (0);
572
573 relalim = (const Elf_Rela *)((const char *)obj->rela + obj->relasize);
574 for (rela = obj->rela; rela < relalim; rela++) {
575 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
576 ptr = (Elf_Addr *)(obj->relocbase + rela->r_addend);
577 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
578
579 lock_release(rtld_bind_lock, lockstate);
580 target = call_ifunc_resolver(ptr);
581 wlock_acquire(rtld_bind_lock, lockstate);
582
583 *where = target;
584 }
585 }
586 /*
587 * XXX Remove me when lld is fixed!
588 * LLD currently makes illegal relocations in the PLT.
589 */
590 relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
591 for (rela = obj->pltrela; rela < relalim; rela++) {
592 if (ELF_R_TYPE(rela->r_info) == R_PPC_IRELATIVE) {
593 ptr = (Elf_Addr *)(obj->relocbase + rela->r_addend);
594 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
595
596 lock_release(rtld_bind_lock, lockstate);
597 target = call_ifunc_resolver(ptr);
598 wlock_acquire(rtld_bind_lock, lockstate);
599
600 *where = target;
601 }
602 }
603
604 obj->irelative = false;
605 return (0);
606 #endif
607 }
608
609 int
reloc_gnu_ifunc(Obj_Entry * obj __unused,int flags __unused,struct Struct_RtldLockState * lockstate __unused)610 reloc_gnu_ifunc(Obj_Entry *obj __unused, int flags __unused,
611 struct Struct_RtldLockState *lockstate __unused)
612 {
613 #if !defined(_CALL_ELF) || _CALL_ELF == 1
614 _rtld_error("reloc_gnu_ifunc(): Not implemented!");
615 /* XXX not implemented */
616 return (-1);
617 #else
618
619 const Elf_Rela *relalim;
620 const Elf_Rela *rela;
621 Elf_Addr *where, target;
622 const Elf_Sym *def;
623 const Obj_Entry *defobj;
624
625 if (!obj->gnu_ifunc)
626 return (0);
627 relalim = (const Elf_Rela *)((const char *)obj->pltrela + obj->pltrelasize);
628 for (rela = obj->pltrela; rela < relalim; rela++) {
629 if (ELF_R_TYPE(rela->r_info) == R_PPC_JMP_SLOT) {
630 where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
631 def = find_symdef(ELF_R_SYM(rela->r_info), obj, &defobj,
632 SYMLOOK_IN_PLT | flags, NULL, lockstate);
633 if (def == NULL)
634 return (-1);
635 if (ELF_ST_TYPE(def->st_info) != STT_GNU_IFUNC)
636 continue;
637 lock_release(rtld_bind_lock, lockstate);
638 target = (Elf_Addr)rtld_resolve_ifunc(defobj, def);
639 wlock_acquire(rtld_bind_lock, lockstate);
640 reloc_jmpslot(where, target, defobj, obj,
641 (const Elf_Rel *)rela);
642 }
643 }
644 obj->gnu_ifunc = false;
645 return (0);
646 #endif
647 }
648
649 int
reloc_iresolve_nonplt(Obj_Entry * obj __unused,struct Struct_RtldLockState * lockstate __unused)650 reloc_iresolve_nonplt(Obj_Entry *obj __unused,
651 struct Struct_RtldLockState *lockstate __unused)
652 {
653 return (0);
654 }
655
656 void
init_pltgot(Obj_Entry * obj)657 init_pltgot(Obj_Entry *obj)
658 {
659 Elf_Addr *pltcall;
660
661 pltcall = obj->pltgot;
662
663 if (pltcall == NULL) {
664 return;
665 }
666
667 #if defined(_CALL_ELF) && _CALL_ELF == 2
668 pltcall[0] = (Elf_Addr)&_rtld_bind_start;
669 pltcall[1] = (Elf_Addr)obj;
670 #else
671 memcpy(pltcall, _rtld_bind_start, sizeof(struct funcdesc));
672 pltcall[2] = (Elf_Addr)obj;
673 #endif
674 }
675
676 /*
677 * Actual values are 32 bit.
678 */
679 u_long cpu_features;
680 u_long cpu_features2;
681
682 void
powerpc64_abi_variant_hook(Elf_Auxinfo ** aux_info)683 powerpc64_abi_variant_hook(Elf_Auxinfo** aux_info)
684 {
685 /*
686 * Since aux_info[] is easier to work with than aux, go ahead and
687 * initialize cpu_features / cpu_features2.
688 */
689 cpu_features = -1UL;
690 cpu_features2 = -1UL;
691 if (aux_info[AT_HWCAP] != NULL)
692 cpu_features = (uint32_t)aux_info[AT_HWCAP]->a_un.a_val;
693 if (aux_info[AT_HWCAP2] != NULL)
694 cpu_features2 = (uint32_t)aux_info[AT_HWCAP2]->a_un.a_val;
695 }
696
697 void
ifunc_init(Elf_Auxinfo * aux_info[__min_size (AT_COUNT)]__unused)698 ifunc_init(Elf_Auxinfo *aux_info[__min_size(AT_COUNT)] __unused)
699 {
700
701 }
702
703 void
allocate_initial_tls(Obj_Entry * list)704 allocate_initial_tls(Obj_Entry *list)
705 {
706
707 /*
708 * Fix the size of the static TLS block by using the maximum
709 * offset allocated so far and adding a bit for dynamic modules to
710 * use.
711 */
712
713 tls_static_space = tls_last_offset + tls_last_size +
714 ld_static_tls_extra;
715
716 _tcb_set(allocate_tls(list, NULL, TLS_TCB_SIZE, TLS_TCB_ALIGN));
717 }
718
719 void*
__tls_get_addr(tls_index * ti)720 __tls_get_addr(tls_index* ti)
721 {
722 return (tls_get_addr_common(_tcb_get(), ti->ti_module, ti->ti_offset +
723 TLS_DTV_OFFSET));
724 }
725
726 void
arch_fix_auxv(Elf_Auxinfo * aux,Elf_Auxinfo * aux_info[])727 arch_fix_auxv(Elf_Auxinfo *aux, Elf_Auxinfo *aux_info[])
728 {
729 Elf_Auxinfo *auxp;
730
731 for (auxp = aux; auxp->a_type != AT_NULL; auxp++) {
732 if (auxp->a_type == 23) /* AT_STACKPROT */
733 return;
734 }
735
736 /* Remap from old-style auxv numbers. */
737 aux_info[23] = aux_info[21]; /* AT_STACKPROT */
738 aux_info[21] = aux_info[19]; /* AT_PAGESIZESLEN */
739 aux_info[19] = aux_info[17]; /* AT_NCPUS */
740 aux_info[17] = aux_info[15]; /* AT_CANARYLEN */
741 aux_info[15] = aux_info[13]; /* AT_EXECPATH */
742 aux_info[13] = NULL; /* AT_GID */
743
744 aux_info[20] = aux_info[18]; /* AT_PAGESIZES */
745 aux_info[18] = aux_info[16]; /* AT_OSRELDATE */
746 aux_info[16] = aux_info[14]; /* AT_CANARY */
747 aux_info[14] = NULL; /* AT_EGID */
748 }
749