1 /* $NetBSD: mips_reloc.c,v 1.58 2010/01/14 11:57:06 skrll Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright 1997 Michael L. Hitch <[email protected]>
7 * Portions copyright 2002 Charles M. Hannum <[email protected]>
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <sys/endian.h>
39
40 #include <stdlib.h>
41 #include <string.h>
42 #include <inttypes.h>
43
44 #include <machine/sysarch.h>
45 #include <machine/tls.h>
46
47 #include "debug.h"
48 #include "rtld.h"
49
50 #ifdef __mips_n64
51 #define GOT1_MASK 0x8000000000000000UL
52 #else
53 #define GOT1_MASK 0x80000000UL
54 #endif
55
56 /*
57 * Determine if the second GOT entry is reserved for rtld or if it is
58 * the first "real" GOT entry.
59 *
60 * This must be a macro rather than a function so that
61 * _rtld_relocate_nonplt_self doesn't trigger a GOT invocation trying
62 * to use it before the local GOT entries in rtld are adjusted.
63 */
64 #ifdef __mips_n64
65 /* Old binutils uses the 32-bit GOT1 mask value for N64. */
66 #define GOT1_RESERVED_FOR_RTLD(got) \
67 (((got)[1] == 0x80000000) || (got)[1] & GOT1_MASK)
68 #else
69 #define GOT1_RESERVED_FOR_RTLD(got) ((got)[1] & GOT1_MASK)
70 #endif
71
72 #ifdef __mips_n64
73 /*
74 * ELF64 MIPS encodes the relocs uniquely. The first 32-bits of info contain
75 * the symbol index. The top 32-bits contain three relocation types encoded
76 * in big-endian integer with first relocation in LSB. This means for little
77 * endian we have to byte swap that integer (r_type).
78 */
79 #define Elf_Sxword Elf64_Sxword
80 #define ELF_R_NXTTYPE_64_P(r_type) ((((r_type) >> 8) & 0xff) == R_TYPE(64))
81 #if BYTE_ORDER == LITTLE_ENDIAN
82 #undef ELF_R_SYM
83 #undef ELF_R_TYPE
84 #define ELF_R_SYM(r_info) ((r_info) & 0xffffffff)
85 #define ELF_R_TYPE(r_info) bswap32((r_info) >> 32)
86 #endif
87 #else
88 #define ELF_R_NXTTYPE_64_P(r_type) (0)
89 #define Elf_Sxword Elf32_Sword
90 #endif
91
92 void _rtld_pltbind_start(void);
93
94 void
init_pltgot(Obj_Entry * obj)95 init_pltgot(Obj_Entry *obj)
96 {
97
98 if (obj->pltgot != NULL) {
99 obj->pltgot[0] = (Elf_Addr) &_rtld_bind_start;
100 if (GOT1_RESERVED_FOR_RTLD(obj->pltgot))
101 obj->pltgot[1] = (Elf_Addr) obj | GOT1_MASK;
102 }
103 if (obj->mips_pltgot != NULL) {
104 obj->mips_pltgot[0] = (Elf_Addr) &_rtld_pltbind_start;
105 obj->mips_pltgot[1] = (Elf_Addr) obj;
106 }
107 }
108
109 int
do_copy_relocations(Obj_Entry * dstobj)110 do_copy_relocations(Obj_Entry *dstobj)
111 {
112 const Obj_Entry *srcobj, *defobj;
113 const Elf_Rel *rellim;
114 const Elf_Rel *rel;
115 const Elf_Sym *srcsym;
116 const Elf_Sym *dstsym;
117 const void *srcaddr;
118 const char *name;
119 void *dstaddr;
120 SymLook req;
121 size_t size;
122 int res;
123
124 /*
125 * COPY relocs are invalid outside of the main program
126 */
127 assert(dstobj->mainprog);
128
129 rellim = (const Elf_Rel *)((const char *)dstobj->rel + dstobj->relsize);
130 for (rel = dstobj->rel; rel < rellim; rel++) {
131 if (ELF_R_TYPE(rel->r_info) != R_MIPS_COPY)
132 continue;
133
134 dstaddr = (void *)(dstobj->relocbase + rel->r_offset);
135 dstsym = dstobj->symtab + ELF_R_SYM(rel->r_info);
136 name = dstobj->strtab + dstsym->st_name;
137 size = dstsym->st_size;
138
139 symlook_init(&req, name);
140 req.ventry = fetch_ventry(dstobj, ELF_R_SYM(rel->r_info));
141 req.flags = SYMLOOK_EARLY;
142
143 for (srcobj = globallist_next(dstobj); srcobj != NULL;
144 srcobj = globallist_next(srcobj)) {
145 res = symlook_obj(&req, srcobj);
146 if (res == 0) {
147 srcsym = req.sym_out;
148 defobj = req.defobj_out;
149 break;
150 }
151 }
152 if (srcobj == NULL) {
153 _rtld_error(
154 "Undefined symbol \"%s\" referenced from COPY relocation in %s",
155 name, dstobj->path);
156 return (-1);
157 }
158
159 srcaddr = (const void *)(defobj->relocbase + srcsym->st_value);
160 memcpy(dstaddr, srcaddr, size);
161 }
162
163 return (0);
164 }
165
166 void _rtld_relocate_nonplt_self(Elf_Dyn *, Elf_Addr);
167
168 /*
169 * It is possible for the compiler to emit relocations for unaligned data.
170 * We handle this situation with these inlines.
171 */
172 static __inline Elf_Sxword
load_ptr(void * where,size_t len)173 load_ptr(void *where, size_t len)
174 {
175 Elf_Sxword val;
176
177 if (__predict_true(((uintptr_t)where & (len - 1)) == 0)) {
178 #ifdef __mips_n64
179 if (len == sizeof(Elf_Sxword))
180 return *(Elf_Sxword *)where;
181 #endif
182 return *(Elf_Sword *)where;
183 }
184
185 val = 0;
186 #if BYTE_ORDER == LITTLE_ENDIAN
187 (void)memcpy(&val, where, len);
188 #endif
189 #if BYTE_ORDER == BIG_ENDIAN
190 (void)memcpy((uint8_t *)((&val)+1) - len, where, len);
191 #endif
192 return (len == sizeof(Elf_Sxword)) ? val : (Elf_Sword)val;
193 }
194
195 static __inline void
store_ptr(void * where,Elf_Sxword val,size_t len)196 store_ptr(void *where, Elf_Sxword val, size_t len)
197 {
198 if (__predict_true(((uintptr_t)where & (len - 1)) == 0)) {
199 #ifdef __mips_n64
200 if (len == sizeof(Elf_Sxword)) {
201 *(Elf_Sxword *)where = val;
202 return;
203 }
204 #endif
205 *(Elf_Sword *)where = val;
206 return;
207 }
208 #if BYTE_ORDER == LITTLE_ENDIAN
209 (void)memcpy(where, &val, len);
210 #endif
211 #if BYTE_ORDER == BIG_ENDIAN
212 (void)memcpy(where, (const uint8_t *)((&val)+1) - len, len);
213 #endif
214 }
215
216 void
_rtld_relocate_nonplt_self(Elf_Dyn * dynp,Elf_Addr relocbase)217 _rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
218 {
219 const Elf_Rel *rel = NULL, *rellim;
220 Elf_Addr relsz = 0;
221 const Elf_Sym *symtab = NULL, *sym;
222 Elf_Addr *where;
223 Elf_Addr *got = NULL;
224 Elf_Word local_gotno = 0, symtabno = 0, gotsym = 0;
225 size_t i;
226
227 for (; dynp->d_tag != DT_NULL; dynp++) {
228 switch (dynp->d_tag) {
229 case DT_REL:
230 rel = (const Elf_Rel *)(relocbase + dynp->d_un.d_ptr);
231 break;
232 case DT_RELSZ:
233 relsz = dynp->d_un.d_val;
234 break;
235 case DT_SYMTAB:
236 symtab = (const Elf_Sym *)(relocbase + dynp->d_un.d_ptr);
237 break;
238 case DT_PLTGOT:
239 got = (Elf_Addr *)(relocbase + dynp->d_un.d_ptr);
240 break;
241 case DT_MIPS_LOCAL_GOTNO:
242 local_gotno = dynp->d_un.d_val;
243 break;
244 case DT_MIPS_SYMTABNO:
245 symtabno = dynp->d_un.d_val;
246 break;
247 case DT_MIPS_GOTSYM:
248 gotsym = dynp->d_un.d_val;
249 break;
250 }
251 }
252
253 i = GOT1_RESERVED_FOR_RTLD(got) ? 2 : 1;
254 /* Relocate the local GOT entries */
255 got += i;
256 for (; i < local_gotno; i++) {
257 *got++ += relocbase;
258 }
259
260 sym = symtab + gotsym;
261 /* Now do the global GOT entries */
262 for (i = gotsym; i < symtabno; i++) {
263 *got = sym->st_value + relocbase;
264 ++sym;
265 ++got;
266 }
267
268 rellim = (const Elf_Rel *)((const char *)rel + relsz);
269 for (; rel < rellim; rel++) {
270 Elf_Word r_symndx, r_type;
271
272 where = (void *)(relocbase + rel->r_offset);
273
274 r_symndx = ELF_R_SYM(rel->r_info);
275 r_type = ELF_R_TYPE(rel->r_info);
276
277 switch (r_type & 0xff) {
278 case R_TYPE(REL32): {
279 const size_t rlen =
280 ELF_R_NXTTYPE_64_P(r_type)
281 ? sizeof(Elf_Sxword)
282 : sizeof(Elf_Sword);
283 Elf_Sxword old = load_ptr(where, rlen);
284 Elf_Sxword val = old;
285 #ifdef __mips_n64
286 assert(r_type == R_TYPE(REL32)
287 || r_type == (R_TYPE(REL32)|(R_TYPE(64) << 8)));
288 #endif
289 assert(r_symndx < gotsym);
290 sym = symtab + r_symndx;
291 assert(ELF_ST_BIND(sym->st_info) == STB_LOCAL);
292 val += relocbase;
293 dbg("REL32/L(%p) %p -> %p in <self>",
294 where, (void *)old, (void *)val);
295 store_ptr(where, val, rlen);
296 break;
297 }
298
299 case R_TYPE(GPREL32):
300 case R_TYPE(NONE):
301 break;
302
303
304 default:
305 abort();
306 break;
307 }
308 }
309 }
310
311 Elf_Addr
_mips_rtld_bind(Obj_Entry * obj,Elf_Size reloff)312 _mips_rtld_bind(Obj_Entry *obj, Elf_Size reloff)
313 {
314 Elf_Addr *got = obj->pltgot;
315 const Elf_Sym *def;
316 const Obj_Entry *defobj;
317 Elf_Addr *where;
318 Elf_Addr target;
319 RtldLockState lockstate;
320
321 rlock_acquire(rtld_bind_lock, &lockstate);
322 if (sigsetjmp(lockstate.env, 0) != 0)
323 lock_upgrade(rtld_bind_lock, &lockstate);
324
325 where = &got[obj->local_gotno + reloff - obj->gotsym];
326 def = find_symdef(reloff, obj, &defobj, SYMLOOK_IN_PLT, NULL,
327 &lockstate);
328 if (def == NULL)
329 rtld_die();
330
331 target = (Elf_Addr)(defobj->relocbase + def->st_value);
332 dbg("bind now/fixup at %s sym # %jd in %s --> was=%p new=%p",
333 obj->path,
334 (intmax_t)reloff, defobj->strtab + def->st_name,
335 (void *)*where, (void *)target);
336 if (!ld_bind_not)
337 *where = target;
338 lock_release(rtld_bind_lock, &lockstate);
339 return (Elf_Addr)target;
340 }
341
342 int
reloc_non_plt(Obj_Entry * obj,Obj_Entry * obj_rtld,int flags,RtldLockState * lockstate)343 reloc_non_plt(Obj_Entry *obj, Obj_Entry *obj_rtld, int flags,
344 RtldLockState *lockstate)
345 {
346 const Elf_Rel *rel;
347 const Elf_Rel *rellim;
348 Elf_Addr *got = obj->pltgot;
349 const Elf_Sym *sym, *def;
350 const Obj_Entry *defobj;
351 Elf_Word i;
352 #ifdef SUPPORT_OLD_BROKEN_LD
353 int broken;
354 #endif
355
356 /* The relocation for the dynamic loader has already been done. */
357 if (obj == obj_rtld)
358 return (0);
359
360 if ((flags & SYMLOOK_IFUNC) != 0)
361 /* XXX not implemented */
362 return (0);
363
364 #ifdef SUPPORT_OLD_BROKEN_LD
365 broken = 0;
366 sym = obj->symtab;
367 for (i = 1; i < 12; i++)
368 if (sym[i].st_info == ELF_ST_INFO(STB_LOCAL, STT_NOTYPE))
369 broken = 1;
370 dbg("%s: broken=%d", obj->path, broken);
371 #endif
372
373 i = GOT1_RESERVED_FOR_RTLD(got) ? 2 : 1;
374
375 /* Relocate the local GOT entries */
376 got += i;
377 dbg("got:%p for %d entries adding %p",
378 got, obj->local_gotno, obj->relocbase);
379 for (; i < obj->local_gotno; i++) {
380 *got += (Elf_Addr)obj->relocbase;
381 got++;
382 }
383 sym = obj->symtab + obj->gotsym;
384
385 dbg("got:%p for %d entries",
386 got, obj->symtabno);
387 /* Now do the global GOT entries */
388 for (i = obj->gotsym; i < obj->symtabno; i++) {
389 dbg(" doing got %d sym %p (%s, %lx)", i - obj->gotsym, sym,
390 sym->st_name + obj->strtab, (u_long) *got);
391
392 #ifdef SUPPORT_OLD_BROKEN_LD
393 if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
394 broken && sym->st_shndx == SHN_UNDEF) {
395 /*
396 * XXX DANGER WILL ROBINSON!
397 * You might think this is stupid, as it intentionally
398 * defeats lazy binding -- and you'd be right.
399 * Unfortunately, for lazy binding to work right, we
400 * need to a way to force the GOT slots used for
401 * function pointers to be resolved immediately. This
402 * is supposed to be done automatically by the linker,
403 * by not outputting a PLT slot and setting st_value
404 * to 0 if there are non-PLT references, but older
405 * versions of GNU ld do not do this.
406 */
407 def = find_symdef(i, obj, &defobj, flags, NULL,
408 lockstate);
409 if (def == NULL)
410 return -1;
411 *got = def->st_value + (Elf_Addr)defobj->relocbase;
412 } else
413 #endif
414 if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
415 sym->st_value != 0 && sym->st_shndx == SHN_UNDEF) {
416 /*
417 * If there are non-PLT references to the function,
418 * st_value should be 0, forcing us to resolve the
419 * address immediately.
420 *
421 * XXX DANGER WILL ROBINSON!
422 * The linker is not outputting PLT slots for calls to
423 * functions that are defined in the same shared
424 * library. This is a bug, because it can screw up
425 * link ordering rules if the symbol is defined in
426 * more than one module. For now, if there is a
427 * definition, we fail the test above and force a full
428 * symbol lookup. This means that all intra-module
429 * calls are bound immediately. - mycroft, 2003/09/24
430 */
431 *got = sym->st_value + (Elf_Addr)obj->relocbase;
432 if ((Elf_Addr)(*got) == (Elf_Addr)obj->relocbase) {
433 dbg("Warning2, i:%d maps to relocbase address:%p",
434 i, obj->relocbase);
435 }
436
437 } else if (sym->st_info == ELF_ST_INFO(STB_GLOBAL, STT_SECTION)) {
438 /* Symbols with index SHN_ABS are not relocated. */
439 if (sym->st_shndx != SHN_ABS) {
440 *got = sym->st_value +
441 (Elf_Addr)obj->relocbase;
442 if ((Elf_Addr)(*got) == (Elf_Addr)obj->relocbase) {
443 dbg("Warning3, i:%d maps to relocbase address:%p",
444 i, obj->relocbase);
445 }
446 }
447 } else {
448 /* TODO: add cache here */
449 def = find_symdef(i, obj, &defobj, flags, NULL,
450 lockstate);
451 if (def == NULL) {
452 dbg("Warning4, can't find symbole %d", i);
453 return -1;
454 }
455 *got = def->st_value + (Elf_Addr)defobj->relocbase;
456 if ((Elf_Addr)(*got) == (Elf_Addr)obj->relocbase) {
457 dbg("Warning4, i:%d maps to relocbase address:%p",
458 i, obj->relocbase);
459 dbg("via first obj symbol %s",
460 obj->strtab + obj->symtab[i].st_name);
461 dbg("found in obj %p:%s",
462 defobj, defobj->path);
463 }
464 }
465
466 dbg(" --> now %lx", (u_long) *got);
467 ++sym;
468 ++got;
469 }
470
471 got = obj->pltgot;
472 rellim = (const Elf_Rel *)((const char *)obj->rel + obj->relsize);
473 for (rel = obj->rel; rel < rellim; rel++) {
474 Elf_Word r_symndx, r_type;
475 void *where;
476
477 where = obj->relocbase + rel->r_offset;
478 r_symndx = ELF_R_SYM(rel->r_info);
479 r_type = ELF_R_TYPE(rel->r_info);
480
481 switch (r_type & 0xff) {
482 case R_TYPE(NONE):
483 break;
484
485 case R_TYPE(REL32): {
486 /* 32-bit PC-relative reference */
487 const size_t rlen =
488 ELF_R_NXTTYPE_64_P(r_type)
489 ? sizeof(Elf_Sxword)
490 : sizeof(Elf_Sword);
491 Elf_Sxword old = load_ptr(where, rlen);
492 Elf_Sxword val = old;
493
494 def = obj->symtab + r_symndx;
495
496 if (r_symndx >= obj->gotsym) {
497 val += got[obj->local_gotno + r_symndx - obj->gotsym];
498 dbg("REL32/G(%p) %p --> %p (%s) in %s",
499 where, (void *)old, (void *)val,
500 obj->strtab + def->st_name,
501 obj->path);
502 } else {
503 /*
504 * XXX: ABI DIFFERENCE!
505 *
506 * Old NetBSD binutils would generate shared
507 * libs with section-relative relocations being
508 * already adjusted for the start address of
509 * the section.
510 *
511 * New binutils, OTOH, generate shared libs
512 * with the same relocations being based at
513 * zero, so we need to add in the start address
514 * of the section.
515 *
516 * --rkb, Oct 6, 2001
517 */
518
519 if (def->st_info ==
520 ELF_ST_INFO(STB_LOCAL, STT_SECTION)
521 #ifdef SUPPORT_OLD_BROKEN_LD
522 && !broken
523 #endif
524 )
525 val += (Elf_Addr)def->st_value;
526
527 val += (Elf_Addr)obj->relocbase;
528
529 dbg("REL32/L(%p) %p -> %p (%s) in %s",
530 where, (void *)old, (void *)val,
531 obj->strtab + def->st_name, obj->path);
532 }
533 store_ptr(where, val, rlen);
534 break;
535 }
536
537 case R_TYPE(COPY):
538 /*
539 * These are deferred until all other relocations have
540 * been done. All we do here is make sure that the
541 * COPY relocation is not in a shared library. They
542 * are allowed only in executable files.
543 */
544 if (!obj->mainprog) {
545 _rtld_error("%s: Unexpected R_MIPS_COPY "
546 "relocation in shared library", obj->path);
547 return (-1);
548 }
549 break;
550
551 #ifdef __mips_n64
552 case R_TYPE(TLS_DTPMOD64):
553 #else
554 case R_TYPE(TLS_DTPMOD32):
555 #endif
556 {
557
558 const size_t rlen = sizeof(Elf_Addr);
559 Elf_Addr old = load_ptr(where, rlen);
560 Elf_Addr val = old;
561
562 def = find_symdef(r_symndx, obj, &defobj, flags, NULL,
563 lockstate);
564 if (def == NULL)
565 return -1;
566
567 val += (Elf_Addr)defobj->tlsindex;
568
569 store_ptr(where, val, rlen);
570 dbg("DTPMOD %s in %s %p --> %p in %s",
571 obj->strtab + obj->symtab[r_symndx].st_name,
572 obj->path, (void *)old, (void*)val, defobj->path);
573 break;
574 }
575
576 #ifdef __mips_n64
577 case R_TYPE(TLS_DTPREL64):
578 #else
579 case R_TYPE(TLS_DTPREL32):
580 #endif
581 {
582 const size_t rlen = sizeof(Elf_Addr);
583 Elf_Addr old = load_ptr(where, rlen);
584 Elf_Addr val = old;
585
586 def = find_symdef(r_symndx, obj, &defobj, flags, NULL,
587 lockstate);
588 if (def == NULL)
589 return -1;
590
591 if (!defobj->tls_done && !allocate_tls_offset(obj))
592 return -1;
593
594 val += (Elf_Addr)def->st_value - TLS_DTP_OFFSET;
595 store_ptr(where, val, rlen);
596
597 dbg("DTPREL %s in %s %p --> %p in %s",
598 obj->strtab + obj->symtab[r_symndx].st_name,
599 obj->path, (void*)old, (void *)val, defobj->path);
600 break;
601 }
602
603 #ifdef __mips_n64
604 case R_TYPE(TLS_TPREL64):
605 #else
606 case R_TYPE(TLS_TPREL32):
607 #endif
608 {
609 const size_t rlen = sizeof(Elf_Addr);
610 Elf_Addr old = load_ptr(where, rlen);
611 Elf_Addr val = old;
612
613 def = find_symdef(r_symndx, obj, &defobj, flags, NULL,
614 lockstate);
615
616 if (def == NULL)
617 return -1;
618
619 if (!defobj->tls_done && !allocate_tls_offset(obj))
620 return -1;
621
622 val += (Elf_Addr)(def->st_value + defobj->tlsoffset
623 - TLS_TP_OFFSET - TLS_TCB_SIZE);
624 store_ptr(where, val, rlen);
625
626 dbg("TPREL %s in %s %p --> %p in %s",
627 obj->strtab + obj->symtab[r_symndx].st_name,
628 obj->path, (void*)old, (void *)val, defobj->path);
629 break;
630 }
631
632
633
634 default:
635 dbg("sym = %lu, type = %lu, offset = %p, "
636 "contents = %p, symbol = %s",
637 (u_long)r_symndx, (u_long)ELF_R_TYPE(rel->r_info),
638 (void *)rel->r_offset,
639 (void *)load_ptr(where, sizeof(Elf_Sword)),
640 obj->strtab + obj->symtab[r_symndx].st_name);
641 _rtld_error("%s: Unsupported relocation type %ld "
642 "in non-PLT relocations",
643 obj->path, (u_long) ELF_R_TYPE(rel->r_info));
644 return -1;
645 }
646 }
647
648 return 0;
649 }
650
651 /*
652 * Process the PLT relocations.
653 */
654 int
reloc_plt(Obj_Entry * obj,int flags __unused,RtldLockState * lockstate __unused)655 reloc_plt(Obj_Entry *obj, int flags __unused, RtldLockState *lockstate __unused)
656 {
657 const Elf_Rel *rellim;
658 const Elf_Rel *rel;
659
660 rellim = (const Elf_Rel *)((const char *)obj->pltrel + obj->pltrelsize);
661 for (rel = obj->pltrel; rel < rellim; rel++) {
662 Elf_Addr *where;
663
664 switch (ELF_R_TYPE(rel->r_info)) {
665 case R_MIPS_JUMP_SLOT:
666 where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
667 *where += (Elf_Addr )obj->relocbase;
668 break;
669 default:
670 _rtld_error("Unknown relocation type %u in PLT",
671 (unsigned int)ELF_R_TYPE(rel->r_info));
672 return (-1);
673 }
674 }
675
676 return (0);
677 }
678
679 /*
680 * LD_BIND_NOW was set - force relocation for all jump slots
681 */
682 int
reloc_jmpslots(Obj_Entry * obj,int flags,RtldLockState * lockstate)683 reloc_jmpslots(Obj_Entry *obj, int flags, RtldLockState *lockstate)
684 {
685 const Obj_Entry *defobj;
686 const Elf_Rel *rellim;
687 const Elf_Rel *rel;
688 const Elf_Sym *def;
689
690 rellim = (const Elf_Rel *)((const char *)obj->pltrel + obj->pltrelsize);
691 for (rel = obj->pltrel; rel < rellim; rel++) {
692 Elf_Addr *where;
693
694 switch (ELF_R_TYPE(rel->r_info)) {
695 case R_MIPS_JUMP_SLOT:
696 def = find_symdef(ELF_R_SYM(rel->r_info), obj,
697 &defobj, SYMLOOK_IN_PLT | flags, NULL, lockstate);
698 if (def == NULL) {
699 dbg("reloc_jmpslots: sym not found");
700 return (-1);
701 }
702
703 where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
704 *where = (Elf_Addr)(defobj->relocbase + def->st_value);
705 break;
706 default:
707 _rtld_error("Unknown relocation type %u in PLT",
708 (unsigned int)ELF_R_TYPE(rel->r_info));
709 return (-1);
710 }
711 }
712
713 return (0);
714 }
715
716 int
reloc_iresolve(Obj_Entry * obj __unused,struct Struct_RtldLockState * lockstate __unused)717 reloc_iresolve(Obj_Entry *obj __unused,
718 struct Struct_RtldLockState *lockstate __unused)
719 {
720
721 /* XXX not implemented */
722 return (0);
723 }
724
725 int
reloc_iresolve_nonplt(Obj_Entry * obj __unused,struct Struct_RtldLockState * lockstate __unused)726 reloc_iresolve_nonplt(Obj_Entry *obj __unused,
727 struct Struct_RtldLockState *lockstate __unused)
728 {
729
730 /* XXX not implemented */
731 return (0);
732 }
733
734 int
reloc_gnu_ifunc(Obj_Entry * obj __unused,int flags __unused,struct Struct_RtldLockState * lockstate __unused)735 reloc_gnu_ifunc(Obj_Entry *obj __unused, int flags __unused,
736 struct Struct_RtldLockState *lockstate __unused)
737 {
738
739 /* XXX not implemented */
740 return (0);
741 }
742
743 Elf_Addr
reloc_jmpslot(Elf_Addr * where,Elf_Addr target,const Obj_Entry * defobj __unused,const Obj_Entry * obj __unused,const Elf_Rel * rel)744 reloc_jmpslot(Elf_Addr *where, Elf_Addr target,
745 const Obj_Entry *defobj __unused, const Obj_Entry *obj __unused,
746 const Elf_Rel *rel)
747 {
748
749 assert(ELF_R_TYPE(rel->r_info) == R_MIPS_JUMP_SLOT);
750
751 if (*where != target && !ld_bind_not)
752 *where = target;
753 return (target);
754 }
755
756 void
ifunc_init(Elf_Auxinfo aux_info[__min_size (AT_COUNT)]__unused)757 ifunc_init(Elf_Auxinfo aux_info[__min_size(AT_COUNT)] __unused)
758 {
759
760 }
761
762 void
allocate_initial_tls(Obj_Entry * objs)763 allocate_initial_tls(Obj_Entry *objs)
764 {
765 char *tls;
766
767 /*
768 * Fix the size of the static TLS block by using the maximum
769 * offset allocated so far and adding a bit for dynamic modules to
770 * use.
771 */
772 tls_static_space = tls_last_offset + tls_last_size + RTLD_STATIC_TLS_EXTRA;
773
774 tls = (char *) allocate_tls(objs, NULL, TLS_TCB_SIZE, 8);
775
776 sysarch(MIPS_SET_TLS, tls);
777 }
778
779 void *
__tls_get_addr(tls_index * ti)780 __tls_get_addr(tls_index* ti)
781 {
782 Elf_Addr **tls;
783 char *p;
784
785 tls = _get_tp();
786 p = tls_get_addr_common(tls, ti->ti_module, ti->ti_offset +
787 TLS_DTP_OFFSET);
788
789 return (p);
790 }
791