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 48struct funcdesc { 49 Elf_Addr addr; 50 Elf_Addr toc; 51 Elf_Addr env; 52}; 53#endif 54 55bool 56arch_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 */ 69int 70do_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 */ 134void 135reloc_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 */ 169static int 170reloc_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 */ 324int 325reloc_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; 359done: 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 */ 383static int 384reloc_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 */ 410int 411reloc_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 */ 447int 448reloc_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 */ 501Elf_Addr 502reloc_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 562out: 563 564 return (target); 565} 566 567int 568reloc_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 624int 625reloc_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 664int 665reloc_iresolve_nonplt(Obj_Entry *obj __unused, 666 struct Struct_RtldLockState *lockstate __unused) 667{ 668 return (0); 669} 670 671void 672init_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 */ 694u_long cpu_features; 695u_long cpu_features2; 696 697void 698powerpc64_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 712void 713ifunc_init(Elf_Auxinfo aux_info[__min_size(AT_COUNT)] __unused) 714{ 715 716} 717 718void 719allocate_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 734void* 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