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) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 /* Get the sparc version of the relocation engine */ 32 #define DO_RELOC_LIBLD_SPARC 33 34 #include <string.h> 35 #include <stdio.h> 36 #include <sys/elf_SPARC.h> 37 #include <debug.h> 38 #include <reloc.h> 39 #include <sparc/machdep_sparc.h> 40 #include "msg.h" 41 #include "_libld.h" 42 #include "machsym.sparc.h" 43 44 /* Forward declarations */ 45 static Xword ld_calc_got_offset(Rel_desc *, Ofl_desc *); 46 static Gotndx *ld_find_gotndx(List *, Gotref, Ofl_desc *, Rel_desc *); 47 48 /* 49 * Local Variable Definitions 50 */ 51 static Sword neggotoffset = 0; /* off. of GOT table from GOT symbol */ 52 static Sword smlgotcnt = M_GOT_XNumber; /* no. of small GOT symbols */ 53 static Sword mixgotcnt = 0; /* # syms with both large/small GOT */ 54 55 static Word 56 ld_init_rel(Rel_desc *reld, void *reloc) 57 { 58 Rela * rela = (Rela *)reloc; 59 60 /* LINTED */ 61 reld->rel_rtype = (Word)ELF_R_TYPE(rela->r_info, M_MACH); 62 reld->rel_roffset = rela->r_offset; 63 reld->rel_raddend = rela->r_addend; 64 reld->rel_typedata = (Word)ELF_R_TYPE_DATA(rela->r_info); 65 66 reld->rel_flags |= FLG_REL_RELA; 67 68 return ((Word)ELF_R_SYM(rela->r_info)); 69 } 70 71 static void 72 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl) 73 { 74 Word eflags = ofl->ofl_dehdr->e_flags; 75 Word memopt1, memopt2; 76 static int firstpass; 77 78 /* 79 * If a *PLUS relocatable is included, the output object is type *PLUS. 80 */ 81 if ((ehdr->e_machine == EM_SPARC32PLUS) && 82 (ehdr->e_flags & EF_SPARC_32PLUS)) 83 ofl->ofl_dehdr->e_machine = EM_SPARC32PLUS; 84 85 /* 86 * On the first pass, we don't yet have a memory model to compare 87 * against, therefore the initial file becomes our baseline. Subsequent 88 * passes will do the comparison described below. 89 */ 90 if (firstpass == 0) { 91 ofl->ofl_dehdr->e_flags |= ehdr->e_flags; 92 firstpass++; 93 return; 94 } 95 96 /* 97 * Determine which memory model to mark the binary with. The options 98 * are (most restrictive to least): 99 * 100 * EF_SPARCV9_TSO 0x0 Total Store Order 101 * EF_SPARCV9_PSO 0x1 Partial Store Order 102 * EF_SPARCV9_RMO 0x2 Relaxed Memory Order 103 * 104 * Mark the binary with the most restrictive option encountered from a 105 * relocatable object included in the link. 106 */ 107 eflags |= (ehdr->e_flags & ~EF_SPARCV9_MM); 108 memopt1 = eflags & EF_SPARCV9_MM; 109 memopt2 = ehdr->e_flags & EF_SPARCV9_MM; 110 eflags &= ~EF_SPARCV9_MM; 111 112 if ((memopt1 == EF_SPARCV9_TSO) || (memopt2 == EF_SPARCV9_TSO)) 113 /* EMPTY */ 114 ; 115 else if ((memopt1 == EF_SPARCV9_PSO) || (memopt2 == EF_SPARCV9_PSO)) 116 eflags |= EF_SPARCV9_PSO; 117 else 118 eflags |= EF_SPARCV9_RMO; 119 120 ofl->ofl_dehdr->e_flags = eflags; 121 } 122 123 static void 124 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt) 125 { 126 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) { 127 /* 128 * Create this entry if we are going to create a PLT table. 129 */ 130 if (ofl->ofl_pltcnt) 131 (*cnt)++; /* DT_PLTGOT */ 132 } 133 } 134 135 static void 136 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn) 137 { 138 if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) { 139 (*dyn)->d_tag = DT_PLTGOT; 140 if (ofl->ofl_osplt) 141 (*dyn)->d_un.d_ptr = ofl->ofl_osplt->os_shdr->sh_addr; 142 else 143 (*dyn)->d_un.d_ptr = 0; 144 (*dyn)++; 145 } 146 } 147 148 #if defined(_ELF64) 149 150 static Xword 151 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 152 { 153 Xword value, pltndx, farpltndx; 154 155 pltndx = sdp->sd_aux->sa_PLTndx + M_PLT_XNumber - 1; 156 157 if ((pltndx) < M64_PLT_NEARPLTS) { 158 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 159 (pltndx * M_PLT_ENTSIZE); 160 return (value); 161 } 162 163 farpltndx = pltndx - M64_PLT_NEARPLTS; 164 165 /* 166 * pltoffset of a far plt is calculated by: 167 * 168 * <size of near plt table> + 169 * <size of preceding far plt blocks> + 170 * <blockndx * sizeof (far plt entsize)> 171 */ 172 value = 173 /* size of near plt table */ 174 (M64_PLT_NEARPLTS * M_PLT_ENTSIZE) + 175 /* size of preceding far plt blocks */ 176 ((farpltndx / M64_PLT_FBLKCNTS) * 177 ((M64_PLT_FENTSIZE + sizeof (Addr)) * 178 M64_PLT_FBLKCNTS)) + 179 /* pltblockendx * fentsize */ 180 ((farpltndx % M64_PLT_FBLKCNTS) * M64_PLT_FENTSIZE); 181 182 value += (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 183 return (value); 184 } 185 186 /* 187 * Instructions required for Far PLT's 188 */ 189 static uchar_t farplt_instrs[24] = { 190 0x8a, 0x10, 0x00, 0x0f, /* mov %o7, %g5 */ 191 0x40, 0x00, 0x00, 0x02, /* call . + 0x8 */ 192 0x01, 0x00, 0x00, 0x00, /* nop */ 193 0xc2, 0x5b, 0xe0, 0x00, /* ldx [%o7 + 0], %g1 */ 194 0x83, 0xc3, 0xc0, 0x01, /* jmpl %o7 + %g1, %g1 */ 195 0x9e, 0x10, 0x00, 0x05 /* mov %g5, %o7 */ 196 }; 197 198 /* 199 * Far PLT'S: 200 * 201 * Far PLT's are established in blocks of '160' at a time. These 202 * PLT's consist of 6 instructions (24 bytes) and 1 pointer (8 bytes). 203 * The instructions are collected together in blocks of 160 entries 204 * followed by 160 pointers. The last group of entries and pointers 205 * may contain less then 160 items. No padding is required. 206 * 207 * .PLT32768: 208 * mov %o7, %g5 209 * call . + 8 210 * nop 211 * ldx [%o7 + .PLTP32768 - (.PLT32768 + 4)], %g1 212 * jmpl %o7 + %g1, %g1 213 * mov %g5, %o7 214 * ................................ 215 * .PLT32927: 216 * mov %o7, %g5 217 * call . + 8 218 * nop 219 * ldx [%o7 + .PLTP32927 - (.PLT32927 + 4)], %g1 220 * jmpl %o7 + %g1, %g1 221 * mov %g5, %o7 222 * .PLTP32768: 223 * .xword .PLT0-(.PLT32768+4) 224 * ................................ 225 * .PLTP32927: 226 * .xword .PLT0-(.PLT32927+4) 227 * 228 */ 229 static void 230 plt_far_entry(Ofl_desc *ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 231 { 232 uint_t blockndx; /* # of far PLT blocks */ 233 uint_t farblkcnt; /* Index to far PLT block */ 234 Xword farpltndx; /* index of Far Plt */ 235 Xword farpltblkndx; /* index of PLT in BLOCK */ 236 uint32_t *pltent; /* ptr to plt instr. sequence */ 237 uint64_t *pltentptr; /* ptr to plt addr ptr */ 238 Sxword pltblockoff; /* offset to Far plt block */ 239 Sxword pltoff; /* offset to PLT instr. sequence */ 240 Sxword pltptroff; /* offset to PLT addr ptr */ 241 uchar_t *pltbuf; /* ptr to PLT's in file */ 242 243 244 farblkcnt = ((ofl->ofl_pltcnt - 1 + 245 M_PLT_XNumber - M64_PLT_NEARPLTS) / M64_PLT_FBLKCNTS); 246 247 /* 248 * Determine the 'Far' PLT index. 249 */ 250 farpltndx = pltndx - 1 + M_PLT_XNumber - M64_PLT_NEARPLTS; 251 farpltblkndx = farpltndx % M64_PLT_FBLKCNTS; 252 253 /* 254 * Determine what FPLT block this plt falls into. 255 */ 256 blockndx = (uint_t)(farpltndx / M64_PLT_FBLKCNTS); 257 258 /* 259 * Calculate the starting offset of the Far PLT block 260 * that this PLT is a member of. 261 */ 262 pltblockoff = (M64_PLT_NEARPLTS * M_PLT_ENTSIZE) + 263 (blockndx * M64_PLT_FBLOCKSZ); 264 265 pltoff = pltblockoff + 266 (farpltblkndx * M64_PLT_FENTSIZE); 267 268 pltptroff = pltblockoff; 269 270 271 if (farblkcnt > blockndx) { 272 /* 273 * If this is a full block - the 'pltptroffs' start 274 * after 160 fplts. 275 */ 276 pltptroff += (M64_PLT_FBLKCNTS * M64_PLT_FENTSIZE) + 277 (farpltblkndx * M64_PLT_PSIZE); 278 } else { 279 Xword lastblkpltndx; 280 /* 281 * If this is the last block - the the pltptr's start 282 * after the last FPLT instruction sequence. 283 */ 284 lastblkpltndx = (ofl->ofl_pltcnt - 1 + M_PLT_XNumber - 285 M64_PLT_NEARPLTS) % M64_PLT_FBLKCNTS; 286 pltptroff += ((lastblkpltndx + 1) * M64_PLT_FENTSIZE) + 287 (farpltblkndx * M64_PLT_PSIZE); 288 } 289 pltbuf = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 290 291 /* 292 * For far-plts, the Raddend and Roffset fields are defined 293 * to be: 294 * 295 * roffset: address of .PLTP# 296 * raddend: -(.PLT#+4) 297 */ 298 *roffset = pltptroff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 299 *raddend = -(pltoff + 4 + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr)); 300 301 /* LINTED */ 302 pltent = (uint32_t *)(pltbuf + pltoff); 303 /* LINTED */ 304 pltentptr = (uint64_t *)(pltbuf + pltptroff); 305 (void) memcpy(pltent, farplt_instrs, sizeof (farplt_instrs)); 306 307 /* 308 * update 309 * ldx [%o7 + 0], %g1 310 * to 311 * ldx [%o7 + .PLTP# - (.PLT# + 4)], %g1 312 */ 313 /* LINTED */ 314 pltent[3] |= (uint32_t)(pltptroff - (pltoff + 4)); 315 316 /* 317 * Store: 318 * .PLTP# 319 * .xword .PLT0 - .PLT# + 4 320 */ 321 *pltentptr = -(pltoff + 4); 322 } 323 324 /* 325 * Build a single V9 P.L.T. entry - code is: 326 * 327 * For Target Addresses +/- 4GB of the entry 328 * ----------------------------------------- 329 * sethi (. - .PLT0), %g1 330 * ba,a %xcc, .PLT1 331 * nop 332 * nop 333 * nop 334 * nop 335 * nop 336 * nop 337 * 338 * For Target Addresses +/- 2GB of the entry 339 * ----------------------------------------- 340 * 341 * .PLT0 is the address of the first entry in the P.L.T. 342 * This one is filled in by the run-time link editor. We just 343 * have to leave space for it. 344 */ 345 static void 346 plt_entry(Ofl_desc *ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 347 { 348 uchar_t *pltent; /* PLT entry being created. */ 349 Sxword pltoff; /* Offset of this entry from PLT top */ 350 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 351 352 /* 353 * The second part of the V9 ABI (sec. 5.2.4) 354 * applies to plt entries greater than 0x8000 (32,768). 355 * This is handled in 'plt_far_entry()' 356 */ 357 if ((pltndx - 1 + M_PLT_XNumber) >= M64_PLT_NEARPLTS) { 358 plt_far_entry(ofl, pltndx, roffset, raddend); 359 return; 360 } 361 362 pltoff = M_PLT_RESERVSZ + (pltndx - 1) * M_PLT_ENTSIZE; 363 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf + pltoff; 364 365 *roffset = pltoff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 366 *raddend = 0; 367 368 /* 369 * PLT[0]: sethi %hi(. - .L0), %g1 370 */ 371 /* LINTED */ 372 *(Word *)pltent = M_SETHIG1 | pltoff; 373 if (bswap) 374 /* LINTED */ 375 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 376 377 /* 378 * PLT[1]: ba,a %xcc, .PLT1 (.PLT1 accessed as a 379 * PC-relative index of longwords). 380 */ 381 pltent += M_PLT_INSSIZE; 382 pltoff += M_PLT_INSSIZE; 383 pltoff = -pltoff; 384 /* LINTED */ 385 *(Word *)pltent = M_BA_A_XCC | 386 (((pltoff + M_PLT_ENTSIZE) >> 2) & S_MASK(19)); 387 if (bswap) 388 /* LINTED */ 389 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 390 391 /* 392 * PLT[2]: sethi 0, %g0 (NOP for delay slot of eventual CTI). 393 */ 394 pltent += M_PLT_INSSIZE; 395 /* LINTED */ 396 *(Word *)pltent = M_NOP; 397 if (bswap) 398 /* LINTED */ 399 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 400 401 /* 402 * PLT[3]: sethi 0, %g0 (NOP for PLT padding). 403 */ 404 pltent += M_PLT_INSSIZE; 405 /* LINTED */ 406 *(Word *)pltent = M_NOP; 407 if (bswap) 408 /* LINTED */ 409 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 410 411 /* 412 * PLT[4]: sethi 0, %g0 (NOP for PLT padding). 413 */ 414 pltent += M_PLT_INSSIZE; 415 /* LINTED */ 416 *(Word *)pltent = M_NOP; 417 if (bswap) 418 /* LINTED */ 419 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 420 421 /* 422 * PLT[5]: sethi 0, %g0 (NOP for PLT padding). 423 */ 424 pltent += M_PLT_INSSIZE; 425 /* LINTED */ 426 *(Word *)pltent = M_NOP; 427 if (bswap) 428 /* LINTED */ 429 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 430 431 /* 432 * PLT[6]: sethi 0, %g0 (NOP for PLT padding). 433 */ 434 pltent += M_PLT_INSSIZE; 435 /* LINTED */ 436 *(Word *)pltent = M_NOP; 437 if (bswap) 438 /* LINTED */ 439 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 440 441 /* 442 * PLT[7]: sethi 0, %g0 (NOP for PLT padding). 443 */ 444 pltent += M_PLT_INSSIZE; 445 /* LINTED */ 446 *(Word *)pltent = M_NOP; 447 if (bswap) 448 /* LINTED */ 449 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 450 } 451 452 453 #else /* Elf 32 */ 454 455 static Xword 456 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 457 { 458 Xword value, pltndx; 459 460 pltndx = sdp->sd_aux->sa_PLTndx + M_PLT_XNumber - 1; 461 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 462 (pltndx * M_PLT_ENTSIZE); 463 return (value); 464 } 465 466 467 /* 468 * Build a single P.L.T. entry - code is: 469 * 470 * sethi (. - .L0), %g1 471 * ba,a .L0 472 * sethi 0, %g0 (nop) 473 * 474 * .L0 is the address of the first entry in the P.L.T. 475 * This one is filled in by the run-time link editor. We just 476 * have to leave space for it. 477 */ 478 static void 479 plt_entry(Ofl_desc * ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 480 { 481 Byte * pltent; /* PLT entry being created. */ 482 Sxword pltoff; /* Offset of this entry from PLT top */ 483 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 484 485 pltoff = M_PLT_RESERVSZ + (pltndx - 1) * M_PLT_ENTSIZE; 486 pltent = (Byte *)ofl->ofl_osplt->os_outdata->d_buf + pltoff; 487 488 *roffset = pltoff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 489 *raddend = 0; 490 491 /* 492 * PLT[0]: sethi %hi(. - .L0), %g1 493 */ 494 /* LINTED */ 495 *(Word *)pltent = M_SETHIG1 | pltoff; 496 if (bswap) 497 /* LINTED */ 498 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 499 500 /* 501 * PLT[1]: ba,a .L0 (.L0 accessed as a PC-relative index of longwords) 502 */ 503 pltent += M_PLT_INSSIZE; 504 pltoff += M_PLT_INSSIZE; 505 pltoff = -pltoff; 506 /* LINTED */ 507 *(Word *)pltent = M_BA_A | ((pltoff >> 2) & S_MASK(22)); 508 if (bswap) 509 /* LINTED */ 510 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 511 512 /* 513 * PLT[2]: sethi 0, %g0 (NOP for delay slot of eventual CTI). 514 */ 515 pltent += M_PLT_INSSIZE; 516 /* LINTED */ 517 *(Word *)pltent = M_SETHIG0; 518 if (bswap) 519 /* LINTED */ 520 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 521 522 /* 523 * PLT[3]: sethi 0, %g0 (NOP for PLT padding). 524 */ 525 pltent += M_PLT_INSSIZE; 526 /* LINTED */ 527 *(Word *)pltent = M_SETHIG0; 528 if (bswap) 529 /* LINTED */ 530 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 531 } 532 533 #endif /* _ELF64 */ 534 535 static uintptr_t 536 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl) 537 { 538 Os_desc * relosp, * osp = 0; 539 Xword ndx, roffset, value; 540 Sxword raddend; 541 const Rel_entry *rep; 542 Rela rea; 543 char *relbits; 544 Sym_desc * sdp, * psym = (Sym_desc *)0; 545 int sectmoved = 0; 546 Word dtflags1 = ofl->ofl_dtflags_1; 547 Word flags = ofl->ofl_flags; 548 549 raddend = orsp->rel_raddend; 550 sdp = orsp->rel_sym; 551 552 /* 553 * Special case, a regsiter symbol associated with symbol 554 * index 0 is initialized (i.e. relocated) to a constant 555 * in the r_addend field rather than to a symbol value. 556 */ 557 if ((orsp->rel_rtype == M_R_REGISTER) && !sdp) { 558 relosp = ofl->ofl_osrel; 559 relbits = (char *)relosp->os_outdata->d_buf; 560 561 rea.r_info = ELF_R_INFO(0, 562 ELF_R_TYPE_INFO(orsp->rel_typedata, orsp->rel_rtype)); 563 rea.r_offset = orsp->rel_roffset; 564 rea.r_addend = raddend; 565 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, 566 relosp->os_name, orsp->rel_sname)); 567 568 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 569 (void) memcpy((relbits + relosp->os_szoutrels), 570 (char *)&rea, sizeof (Rela)); 571 relosp->os_szoutrels += (Xword)sizeof (Rela); 572 573 return (1); 574 } 575 576 /* 577 * If the section this relocation is against has been discarded 578 * (-zignore), then also discard (skip) the relocation itself. 579 */ 580 if (orsp->rel_isdesc && ((orsp->rel_flags & 581 (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) && 582 (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) { 583 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp)); 584 return (1); 585 } 586 587 /* 588 * If this is a relocation against a move table, or expanded move 589 * table, adjust the relocation entries. 590 */ 591 if (orsp->rel_move) 592 ld_adj_movereloc(ofl, orsp); 593 594 /* 595 * If this is a relocation against a section then we need to adjust the 596 * raddend field to compensate for the new position of the input section 597 * within the new output section. 598 */ 599 if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) { 600 if (ofl->ofl_parsym.head && 601 (sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 602 (psym = ld_am_I_partial(orsp, orsp->rel_raddend))) { 603 /* 604 * If the symbol is moved, adjust the value 605 */ 606 DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym)); 607 sectmoved = 1; 608 if (ofl->ofl_flags & FLG_OF_RELOBJ) 609 raddend = psym->sd_sym->st_value; 610 else 611 raddend = psym->sd_sym->st_value - 612 psym->sd_isc->is_osdesc->os_shdr->sh_addr; 613 /* LINTED */ 614 raddend += (Off)_elf_getxoff(psym->sd_isc->is_indata); 615 if (psym->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 616 raddend += 617 psym->sd_isc->is_osdesc->os_shdr->sh_addr; 618 } else { 619 /* LINTED */ 620 raddend += (Off)_elf_getxoff(sdp->sd_isc->is_indata); 621 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 622 raddend += 623 sdp->sd_isc->is_osdesc->os_shdr->sh_addr; 624 } 625 } 626 627 value = sdp->sd_sym->st_value; 628 629 if (orsp->rel_flags & FLG_REL_GOT) { 630 osp = ofl->ofl_osgot; 631 roffset = ld_calc_got_offset(orsp, ofl); 632 633 } else if (orsp->rel_flags & FLG_REL_PLT) { 634 osp = ofl->ofl_osplt; 635 plt_entry(ofl, sdp->sd_aux->sa_PLTndx, &roffset, &raddend); 636 } else if (orsp->rel_flags & FLG_REL_BSS) { 637 /* 638 * This must be a R_SPARC_COPY. For these set the roffset to 639 * point to the new symbols location. 640 */ 641 osp = ofl->ofl_isbss->is_osdesc; 642 roffset = (Xword)value; 643 644 /* 645 * The raddend doesn't mean anything in an R_SPARC_COPY 646 * relocation. Null it out because it can confuse people. 647 */ 648 raddend = 0; 649 } else if (orsp->rel_flags & FLG_REL_REG) { 650 /* 651 * The offsets of relocations against register symbols 652 * identifiy the register directly - so the offset 653 * does not need to be adjusted. 654 */ 655 roffset = orsp->rel_roffset; 656 } else { 657 osp = orsp->rel_osdesc; 658 659 /* 660 * Calculate virtual offset of reference point; equals offset 661 * into section + vaddr of section for loadable sections, or 662 * offset plus section displacement for nonloadable sections. 663 */ 664 roffset = orsp->rel_roffset + 665 (Off)_elf_getxoff(orsp->rel_isdesc->is_indata); 666 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) 667 roffset += orsp->rel_isdesc->is_osdesc-> 668 os_shdr->sh_addr; 669 } 670 671 if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0)) 672 relosp = ofl->ofl_osrel; 673 674 /* 675 * Verify that the output relocations offset meets the 676 * alignment requirements of the relocation being processed. 677 */ 678 rep = &reloc_table[orsp->rel_rtype]; 679 if (((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) && 680 !(rep->re_flags & FLG_RE_UNALIGN)) { 681 if (((rep->re_fsize == 2) && (roffset & 0x1)) || 682 ((rep->re_fsize == 4) && (roffset & 0x3)) || 683 ((rep->re_fsize == 8) && (roffset & 0x7))) { 684 Conv_inv_buf_t inv_buf; 685 686 eprintf(ofl->ofl_lml, ERR_FATAL, 687 MSG_INTL(MSG_REL_NONALIGN), 688 conv_reloc_SPARC_type(orsp->rel_rtype, 0, &inv_buf), 689 orsp->rel_isdesc->is_file->ifl_name, 690 demangle(orsp->rel_sname), EC_XWORD(roffset)); 691 return (S_ERROR); 692 } 693 } 694 695 /* 696 * Assign the symbols index for the output relocation. If the 697 * relocation refers to a SECTION symbol then it's index is based upon 698 * the output sections symbols index. Otherwise the index can be 699 * derived from the symbols index itself. 700 */ 701 if (orsp->rel_rtype == R_SPARC_RELATIVE) 702 ndx = STN_UNDEF; 703 else if ((orsp->rel_flags & FLG_REL_SCNNDX) || 704 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) { 705 if (sectmoved == 0) { 706 /* 707 * Check for a null input section. This can 708 * occur if this relocation references a symbol 709 * generated by sym_add_sym(). 710 */ 711 if ((sdp->sd_isc != 0) && 712 (sdp->sd_isc->is_osdesc != 0)) 713 ndx = sdp->sd_isc->is_osdesc->os_scnsymndx; 714 else 715 ndx = sdp->sd_shndx; 716 } else 717 ndx = ofl->ofl_sunwdata1ndx; 718 } else 719 ndx = sdp->sd_symndx; 720 721 /* 722 * Add the symbols 'value' to the addend field. 723 */ 724 if (orsp->rel_flags & FLG_REL_ADVAL) 725 raddend += value; 726 727 /* 728 * The addend field for R_SPARC_TLS_DTPMOD32 and R_SPARC_TLS_DTPMOD64 729 * mean nothing. The addend is propagated in the corresponding 730 * R_SPARC_TLS_DTPOFF* relocations. 731 */ 732 if (orsp->rel_rtype == M_R_DTPMOD) 733 raddend = 0; 734 735 relbits = (char *)relosp->os_outdata->d_buf; 736 737 rea.r_info = ELF_R_INFO(ndx, ELF_R_TYPE_INFO(orsp->rel_typedata, 738 orsp->rel_rtype)); 739 rea.r_offset = roffset; 740 rea.r_addend = raddend; 741 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, relosp->os_name, 742 orsp->rel_sname)); 743 744 /* 745 * Assert we haven't walked off the end of our relocation table. 746 */ 747 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 748 749 (void) memcpy((relbits + relosp->os_szoutrels), 750 (char *)&rea, sizeof (Rela)); 751 relosp->os_szoutrels += (Xword)sizeof (Rela); 752 753 /* 754 * Determine if this relocation is against a non-writable, allocatable 755 * section. If so we may need to provide a text relocation diagnostic. 756 */ 757 ld_reloc_remain_entry(orsp, osp, ofl); 758 return (1); 759 } 760 761 762 /* 763 * Sparc Instructions for TLS processing 764 */ 765 #if defined(_ELF64) 766 #define TLS_GD_IE_LD 0xd0580000 /* ldx [%g0 + %g0], %o0 */ 767 #else 768 #define TLS_GD_IE_LD 0xd0000000 /* ld [%g0 + %g0], %o0 */ 769 #endif 770 #define TLS_GD_IE_ADD 0x9001c008 /* add %g7, %o0, %o0 */ 771 772 #define TLS_GD_LE_XOR 0x80182000 /* xor %g0, 0, %g0 */ 773 #define TLS_IE_LE_OR 0x80100000 /* or %g0, %o0, %o1 */ 774 /* synthetic: mov %g0, %g0 */ 775 776 #define TLS_LD_LE_CLRO0 0x90100000 /* clr %o0 */ 777 778 #define FM3_REG_MSK_RD (0x1f << 25) /* Formate (3) rd register mask */ 779 /* bits 25->29 */ 780 #define FM3_REG_MSK_RS1 (0x1f << 14) /* Formate (3) rs1 register mask */ 781 /* bits 14->18 */ 782 #define FM3_REG_MSK_RS2 0x1f /* Formate (3) rs2 register mask */ 783 /* bits 0->4 */ 784 785 #define REG_G7 7 /* %g7 register */ 786 787 static Fixupret 788 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp) 789 { 790 Sym_desc *sdp = arsp->rel_sym; 791 Word rtype = arsp->rel_rtype; 792 Word *offset, w; 793 int bswap = OFL_SWAP_RELOC_DATA(ofl, arsp); 794 795 796 offset = (Word *)((uintptr_t)arsp->rel_roffset + 797 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) + 798 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 799 800 if (sdp->sd_ref == REF_DYN_NEED) { 801 /* 802 * IE reference model 803 */ 804 switch (rtype) { 805 case R_SPARC_TLS_GD_HI22: 806 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 807 R_SPARC_TLS_IE_HI22, arsp)); 808 arsp->rel_rtype = R_SPARC_TLS_IE_HI22; 809 return (FIX_RELOC); 810 811 case R_SPARC_TLS_GD_LO10: 812 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 813 R_SPARC_TLS_IE_LO10, arsp)); 814 arsp->rel_rtype = R_SPARC_TLS_IE_LO10; 815 return (FIX_RELOC); 816 817 case R_SPARC_TLS_GD_ADD: 818 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 819 R_SPARC_NONE, arsp)); 820 w = bswap ? ld_bswap_Word(*offset) : *offset; 821 w = (TLS_GD_IE_LD | 822 (w & (FM3_REG_MSK_RS1 | FM3_REG_MSK_RS2))); 823 *offset = bswap ? ld_bswap_Word(w) : w; 824 return (FIX_DONE); 825 826 case R_SPARC_TLS_GD_CALL: 827 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 828 R_SPARC_NONE, arsp)); 829 *offset = TLS_GD_IE_ADD; 830 if (bswap) 831 *offset = ld_bswap_Word(*offset); 832 return (FIX_DONE); 833 } 834 return (FIX_RELOC); 835 } 836 837 /* 838 * LE reference model 839 */ 840 switch (rtype) { 841 case R_SPARC_TLS_IE_HI22: 842 case R_SPARC_TLS_GD_HI22: 843 case R_SPARC_TLS_LDO_HIX22: 844 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 845 R_SPARC_TLS_LE_HIX22, arsp)); 846 arsp->rel_rtype = R_SPARC_TLS_LE_HIX22; 847 return (FIX_RELOC); 848 849 case R_SPARC_TLS_LDO_LOX10: 850 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 851 R_SPARC_TLS_LE_LOX10, arsp)); 852 arsp->rel_rtype = R_SPARC_TLS_LE_LOX10; 853 return (FIX_RELOC); 854 855 case R_SPARC_TLS_IE_LO10: 856 case R_SPARC_TLS_GD_LO10: 857 /* 858 * Current instruction is: 859 * 860 * or r1, %lo(x), r2 861 * or 862 * add r1, %lo(x), r2 863 * 864 * 865 * Need to udpate this to: 866 * 867 * xor r1, %lox(x), r2 868 */ 869 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 870 R_SPARC_TLS_LE_LOX10, arsp)); 871 w = bswap ? ld_bswap_Word(*offset) : *offset; 872 w = TLS_GD_LE_XOR | 873 (w & (FM3_REG_MSK_RS1 | FM3_REG_MSK_RD)); 874 *offset = bswap ? ld_bswap_Word(w) : w; 875 arsp->rel_rtype = R_SPARC_TLS_LE_LOX10; 876 return (FIX_RELOC); 877 878 case R_SPARC_TLS_IE_LD: 879 case R_SPARC_TLS_IE_LDX: 880 /* 881 * Current instruction: 882 * ld{x} [r1 + r2], r3 883 * 884 * Need to update this to: 885 * 886 * mov r2, r3 (or %g0, r2, r3) 887 */ 888 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 889 R_SPARC_NONE, arsp)); 890 w = bswap ? ld_bswap_Word(*offset) : *offset; 891 w = (w & (FM3_REG_MSK_RS2 | FM3_REG_MSK_RD)) | TLS_IE_LE_OR; 892 *offset = bswap ? ld_bswap_Word(w) : w; 893 return (FIX_DONE); 894 895 case R_SPARC_TLS_LDO_ADD: 896 case R_SPARC_TLS_GD_ADD: 897 /* 898 * Current instruction is: 899 * 900 * add gptr_reg, r2, r3 901 * 902 * Need to updated this to: 903 * 904 * add %g7, r2, r3 905 */ 906 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 907 R_SPARC_NONE, arsp)); 908 w = bswap ? ld_bswap_Word(*offset) : *offset; 909 w = w & (~FM3_REG_MSK_RS1); 910 w = w | (REG_G7 << 14); 911 *offset = bswap ? ld_bswap_Word(w) : w; 912 return (FIX_DONE); 913 914 case R_SPARC_TLS_LDM_CALL: 915 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 916 R_SPARC_NONE, arsp)); 917 *offset = TLS_LD_LE_CLRO0; 918 if (bswap) 919 *offset = ld_bswap_Word(*offset); 920 return (FIX_DONE); 921 922 case R_SPARC_TLS_LDM_HI22: 923 case R_SPARC_TLS_LDM_LO10: 924 case R_SPARC_TLS_LDM_ADD: 925 case R_SPARC_TLS_IE_ADD: 926 case R_SPARC_TLS_GD_CALL: 927 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 928 R_SPARC_NONE, arsp)); 929 *offset = M_NOP; 930 if (bswap) 931 *offset = ld_bswap_Word(*offset); 932 return (FIX_DONE); 933 } 934 return (FIX_RELOC); 935 } 936 937 #define GOTOP_ADDINST 0x80000000 /* add %g0, %g0, %g0 */ 938 939 static Fixupret 940 gotop_fixups(Ofl_desc *ofl, Rel_desc *arsp) 941 { 942 Word rtype = arsp->rel_rtype; 943 Word *offset, w; 944 const char *ifl_name; 945 Conv_inv_buf_t inv_buf; 946 int bswap; 947 948 switch (rtype) { 949 case R_SPARC_GOTDATA_OP_HIX22: 950 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 951 R_SPARC_GOTDATA_HIX22, arsp)); 952 arsp->rel_rtype = R_SPARC_GOTDATA_HIX22; 953 return (FIX_RELOC); 954 955 case R_SPARC_GOTDATA_OP_LOX10: 956 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 957 R_SPARC_GOTDATA_LOX10, arsp)); 958 arsp->rel_rtype = R_SPARC_GOTDATA_LOX10; 959 return (FIX_RELOC); 960 961 case R_SPARC_GOTDATA_OP: 962 /* 963 * Current instruction: 964 * ld{x} [r1 + r2], r3 965 * 966 * Need to update this to: 967 * 968 * add r1, r2, r3 969 */ 970 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 971 R_SPARC_NONE, arsp)); 972 offset = (Word *)(uintptr_t)(arsp->rel_roffset + 973 _elf_getxoff(arsp->rel_isdesc->is_indata) + 974 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 975 bswap = OFL_SWAP_RELOC_DATA(ofl, arsp); 976 w = bswap ? ld_bswap_Word(*offset) : *offset; 977 w = (w & (FM3_REG_MSK_RS1 | 978 FM3_REG_MSK_RS2 | FM3_REG_MSK_RD)) | GOTOP_ADDINST; 979 *offset = bswap ? ld_bswap_Word(w) : w; 980 return (FIX_DONE); 981 } 982 /* 983 * We should not get here 984 */ 985 if (arsp->rel_isdesc->is_file) 986 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 987 else 988 ifl_name = MSG_INTL(MSG_STR_NULL); 989 990 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_BADGOTFIX), 991 conv_reloc_SPARC_type(arsp->rel_rtype, 0, &inv_buf), 992 ifl_name, demangle(arsp->rel_sname)); 993 994 assert(0); 995 return (FIX_ERROR); 996 } 997 998 static uintptr_t 999 ld_do_activerelocs(Ofl_desc *ofl) 1000 { 1001 Rel_desc *arsp; 1002 Rel_cache *rcp; 1003 Listnode *lnp; 1004 uintptr_t return_code = 1; 1005 Word flags = ofl->ofl_flags; 1006 1007 if (ofl->ofl_actrels.head) 1008 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 1009 1010 /* 1011 * Process active relocations. 1012 */ 1013 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 1014 /* LINTED */ 1015 for (arsp = (Rel_desc *)(rcp + 1); 1016 arsp < rcp->rc_free; arsp++) { 1017 uchar_t *addr; 1018 Xword value; 1019 Sym_desc *sdp; 1020 const char *ifl_name; 1021 Xword refaddr; 1022 1023 /* 1024 * If the section this relocation is against has been 1025 * discarded (-zignore), then discard (skip) the 1026 * relocation itself. 1027 */ 1028 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 1029 ((arsp->rel_flags & 1030 (FLG_REL_GOT | FLG_REL_BSS | 1031 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 1032 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 1033 M_MACH, arsp)); 1034 continue; 1035 } 1036 1037 /* 1038 * Perform any required TLS fixups. 1039 */ 1040 if (arsp->rel_flags & FLG_REL_TLSFIX) { 1041 Fixupret ret; 1042 1043 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 1044 return (S_ERROR); 1045 if (ret == FIX_DONE) 1046 continue; 1047 } 1048 1049 /* 1050 * Perform any required GOTOP fixups. 1051 */ 1052 if (arsp->rel_flags & FLG_REL_GOTFIX) { 1053 Fixupret ret; 1054 1055 if ((ret = 1056 gotop_fixups(ofl, arsp)) == FIX_ERROR) 1057 return (S_ERROR); 1058 if (ret == FIX_DONE) 1059 continue; 1060 } 1061 1062 /* 1063 * If this is a relocation against the move table, or 1064 * expanded move table, adjust the relocation entries. 1065 */ 1066 if (arsp->rel_move) 1067 ld_adj_movereloc(ofl, arsp); 1068 1069 sdp = arsp->rel_sym; 1070 refaddr = arsp->rel_roffset + 1071 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 1072 1073 if ((arsp->rel_flags & FLG_REL_CLVAL) || 1074 (arsp->rel_flags & FLG_REL_GOTCL)) 1075 value = 0; 1076 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 1077 STT_SECTION) { 1078 Sym_desc *sym; 1079 1080 /* 1081 * The value for a symbol pointing to a SECTION 1082 * is based off of that sections position. 1083 */ 1084 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 1085 (sym = ld_am_I_partial(arsp, 1086 arsp->rel_roffset))) { 1087 /* 1088 * If the symbol is moved, 1089 * adjust the value 1090 */ 1091 value = _elf_getxoff( 1092 sym->sd_isc->is_indata); 1093 if (sym->sd_isc->is_shdr->sh_flags & 1094 SHF_ALLOC) 1095 value += sym->sd_isc-> 1096 is_osdesc->os_shdr->sh_addr; 1097 } else { 1098 value = _elf_getxoff( 1099 sdp->sd_isc->is_indata); 1100 if (sdp->sd_isc->is_shdr->sh_flags & 1101 SHF_ALLOC) 1102 value += sdp->sd_isc-> 1103 is_osdesc->os_shdr->sh_addr; 1104 } 1105 1106 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 1107 value -= ofl->ofl_tlsphdr->p_vaddr; 1108 1109 } else if (IS_SIZE(arsp->rel_rtype)) { 1110 /* 1111 * Size relocations require the symbols size. 1112 */ 1113 value = sdp->sd_sym->st_size; 1114 } else { 1115 /* 1116 * Else the value is the symbols value. 1117 */ 1118 value = sdp->sd_sym->st_value; 1119 } 1120 1121 /* 1122 * Relocation against the GLOBAL_OFFSET_TABLE. 1123 */ 1124 if (arsp->rel_flags & FLG_REL_GOT) 1125 arsp->rel_osdesc = ofl->ofl_osgot; 1126 1127 /* 1128 * If loadable and not producing a relocatable object 1129 * add the sections virtual address to the reference 1130 * address. 1131 */ 1132 if ((arsp->rel_flags & FLG_REL_LOAD) && 1133 ((flags & FLG_OF_RELOBJ) == 0)) 1134 refaddr += arsp->rel_isdesc->is_osdesc-> 1135 os_shdr->sh_addr; 1136 1137 /* 1138 * If this entry has a PLT assigned to it, it's 1139 * value is actually the address of the PLT (and 1140 * not the address of the function). 1141 */ 1142 if (IS_PLT(arsp->rel_rtype)) { 1143 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 1144 value = ld_calc_plt_addr(sdp, ofl); 1145 } 1146 1147 /* 1148 * Add relocations addend to value. Add extra 1149 * relocation addend if needed. 1150 */ 1151 value += arsp->rel_raddend; 1152 if (IS_EXTOFFSET(arsp->rel_rtype)) 1153 value += arsp->rel_typedata; 1154 1155 /* 1156 * Determine whether the value needs further adjustment. 1157 * Filter through the attributes of the relocation to 1158 * determine what adjustment is required. Note, many 1159 * of the following cases are only applicable when a 1160 * .got is present. As a .got is not generated when a 1161 * relocatable object is being built, any adjustments 1162 * that require a .got need to be skipped. 1163 */ 1164 if ((arsp->rel_flags & FLG_REL_GOT) && 1165 ((flags & FLG_OF_RELOBJ) == 0)) { 1166 Xword R1addr; 1167 uintptr_t R2addr; 1168 Sword gotndx; 1169 Gotndx *gnp; 1170 Gotref gref; 1171 1172 /* 1173 * Clear the GOT table entry, on SPARC we clear 1174 * the entry and the 'value' if needed is stored 1175 * in an output relocations addend. 1176 * 1177 * Calculate offset into GOT at which to apply 1178 * the relocation. 1179 */ 1180 if (arsp->rel_flags & FLG_REL_DTLS) 1181 gref = GOT_REF_TLSGD; 1182 else if (arsp->rel_flags & FLG_REL_MTLS) 1183 gref = GOT_REF_TLSLD; 1184 else if (arsp->rel_flags & FLG_REL_STLS) 1185 gref = GOT_REF_TLSIE; 1186 else 1187 gref = GOT_REF_GENERIC; 1188 1189 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 1190 ofl, arsp); 1191 assert(gnp); 1192 1193 if (arsp->rel_rtype == M_R_DTPOFF) 1194 gotndx = gnp->gn_gotndx + 1; 1195 else 1196 gotndx = gnp->gn_gotndx; 1197 1198 /* LINTED */ 1199 R1addr = (Xword)((-neggotoffset * 1200 M_GOT_ENTSIZE) + (gotndx * M_GOT_ENTSIZE)); 1201 1202 /* 1203 * Add the GOTs data's offset. 1204 */ 1205 R2addr = R1addr + (uintptr_t) 1206 arsp->rel_osdesc->os_outdata->d_buf; 1207 1208 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 1209 ELF_DBG_LD, M_MACH, SHT_RELA, 1210 arsp->rel_rtype, R1addr, value, 1211 arsp->rel_sname, arsp->rel_osdesc)); 1212 1213 /* 1214 * And do it. 1215 */ 1216 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 1217 *(Xword *)R2addr = 1218 ld_bswap_Xword(value); 1219 else 1220 *(Xword *)R2addr = value; 1221 continue; 1222 1223 } else if (IS_GOT_BASED(arsp->rel_rtype) && 1224 ((flags & FLG_OF_RELOBJ) == 0)) { 1225 value -= (ofl->ofl_osgot->os_shdr->sh_addr + 1226 (-neggotoffset * M_GOT_ENTSIZE)); 1227 1228 } else if (IS_PC_RELATIVE(arsp->rel_rtype)) { 1229 value -= refaddr; 1230 1231 } else if (IS_TLS_INS(arsp->rel_rtype) && 1232 IS_GOT_RELATIVE(arsp->rel_rtype) && 1233 ((flags & FLG_OF_RELOBJ) == 0)) { 1234 Gotndx *gnp; 1235 Gotref gref; 1236 1237 if (arsp->rel_flags & FLG_REL_STLS) 1238 gref = GOT_REF_TLSIE; 1239 else if (arsp->rel_flags & FLG_REL_DTLS) 1240 gref = GOT_REF_TLSGD; 1241 else if (arsp->rel_flags & FLG_REL_MTLS) 1242 gref = GOT_REF_TLSLD; 1243 1244 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 1245 ofl, arsp); 1246 assert(gnp); 1247 1248 value = gnp->gn_gotndx * M_GOT_ENTSIZE; 1249 1250 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 1251 ((flags & FLG_OF_RELOBJ) == 0)) { 1252 Gotndx *gnp; 1253 1254 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1255 GOT_REF_GENERIC, ofl, arsp); 1256 assert(gnp); 1257 1258 value = gnp->gn_gotndx * M_GOT_ENTSIZE; 1259 1260 } else if ((arsp->rel_flags & FLG_REL_STLS) && 1261 ((flags & FLG_OF_RELOBJ) == 0)) { 1262 Xword tlsstatsize; 1263 1264 /* 1265 * This is the LE TLS 1266 * reference model. Static offset 1267 * is hard-coded, and negated so that 1268 * it can be added to the thread pointer (%g7) 1269 */ 1270 tlsstatsize = S_ROUND(ofl-> 1271 ofl_tlsphdr->p_memsz, M_TLSSTATALIGN); 1272 value = -(tlsstatsize - value); 1273 } 1274 1275 if (arsp->rel_isdesc->is_file) 1276 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 1277 else 1278 ifl_name = MSG_INTL(MSG_STR_NULL); 1279 1280 /* 1281 * Make sure we have data to relocate. Compiler and 1282 * assembler developers have been known to generate 1283 * relocations against invalid sections (normally .bss), 1284 * so for their benefit give them sufficient information 1285 * to help analyze the problem. End users should never 1286 * see this. 1287 */ 1288 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 1289 Conv_inv_buf_t inv_buf; 1290 1291 eprintf(ofl->ofl_lml, ERR_FATAL, 1292 MSG_INTL(MSG_REL_EMPTYSEC), 1293 conv_reloc_SPARC_type(arsp->rel_rtype, 1294 0, &inv_buf), ifl_name, 1295 demangle(arsp->rel_sname), 1296 arsp->rel_isdesc->is_name); 1297 return (S_ERROR); 1298 } 1299 1300 /* 1301 * Get the address of the data item we need to modify. 1302 */ 1303 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 1304 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 1305 is_indata)); 1306 1307 /*LINTED*/ 1308 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 1309 M_MACH, SHT_RELA, arsp->rel_rtype, EC_NATPTR(addr), 1310 value, arsp->rel_sname, arsp->rel_osdesc)); 1311 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 1312 1313 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 1314 ofl->ofl_size) || (arsp->rel_roffset > 1315 arsp->rel_osdesc->os_shdr->sh_size)) { 1316 Conv_inv_buf_t inv_buf; 1317 int class; 1318 1319 if (((uintptr_t)addr - 1320 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 1321 class = ERR_FATAL; 1322 else 1323 class = ERR_WARNING; 1324 1325 eprintf(ofl->ofl_lml, class, 1326 MSG_INTL(MSG_REL_INVALOFFSET), 1327 conv_reloc_SPARC_type(arsp->rel_rtype, 1328 0, &inv_buf), ifl_name, 1329 arsp->rel_isdesc->is_name, 1330 demangle(arsp->rel_sname), 1331 EC_ADDR((uintptr_t)addr - 1332 (uintptr_t)ofl->ofl_nehdr)); 1333 1334 if (class == ERR_FATAL) { 1335 return_code = S_ERROR; 1336 continue; 1337 } 1338 } 1339 1340 /* 1341 * If '-z noreloc' is specified - skip the do_reloc 1342 * stage. 1343 */ 1344 if (OFL_DO_RELOC(ofl)) { 1345 if (do_reloc_ld((uchar_t)arsp->rel_rtype, addr, 1346 &value, arsp->rel_sname, ifl_name, 1347 OFL_SWAP_RELOC_DATA(ofl, arsp), 1348 ofl->ofl_lml) == 0) 1349 return_code = S_ERROR; 1350 } 1351 } 1352 } 1353 return (return_code); 1354 } 1355 1356 static uintptr_t 1357 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1358 { 1359 Rel_desc *orsp; 1360 Rel_cache *rcp; 1361 Sym_desc *sdp = rsp->rel_sym; 1362 Conv_inv_buf_t inv_buf; 1363 1364 /* 1365 * Static executables *do not* want any relocations against them. 1366 * Since our engine still creates relocations against a WEAK UNDEFINED 1367 * symbol in a static executable, it's best to disable them here 1368 * instead of through out the relocation code. 1369 */ 1370 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 1371 (FLG_OF_STATIC | FLG_OF_EXEC)) 1372 return (1); 1373 1374 /* 1375 * Certain relocations do not make sense in a 64bit shared object, 1376 * if building a shared object do a sanity check on the output 1377 * relocations being created. 1378 */ 1379 if (ofl->ofl_flags & FLG_OF_SHAROBJ) { 1380 Word rtype = rsp->rel_rtype; 1381 /* 1382 * Because the R_SPARC_HIPLT22 & R_SPARC_LOPLT10 relocations 1383 * are not relative they make no sense to create in a shared 1384 * object - so emit the proper error message if that occurs. 1385 */ 1386 if ((rtype == R_SPARC_HIPLT22) || (rtype == R_SPARC_LOPLT10)) { 1387 eprintf(ofl->ofl_lml, ERR_FATAL, 1388 MSG_INTL(MSG_REL_UNRELREL), 1389 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1390 rsp->rel_isdesc->is_file->ifl_name, 1391 demangle(rsp->rel_sname)); 1392 return (S_ERROR); 1393 } 1394 #if defined(_ELF64) 1395 /* 1396 * Each of the following relocations requires that the 1397 * object being built be loaded in either the upper 32 or 1398 * 44 bit range of memory. Since shared libraries traditionally 1399 * are loaded in the lower range of memory - this isn't going 1400 * to work. 1401 */ 1402 if ((rtype == R_SPARC_H44) || (rtype == R_SPARC_M44) || 1403 (rtype == R_SPARC_L44)) { 1404 eprintf(ofl->ofl_lml, ERR_FATAL, 1405 MSG_INTL(MSG_REL_SHOBJABS44), 1406 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1407 rsp->rel_isdesc->is_file->ifl_name, 1408 demangle(rsp->rel_sname)); 1409 return (S_ERROR); 1410 } 1411 #endif 1412 } 1413 1414 /* 1415 * If no relocation cache structures are available allocate 1416 * a new one and link it into the cache list. 1417 */ 1418 if ((ofl->ofl_outrels.tail == 0) || 1419 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1420 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1421 static size_t nextsize = 0; 1422 size_t size; 1423 1424 /* 1425 * Output relocation numbers can vary considerably between 1426 * building executables or shared objects (pic vs. non-pic), 1427 * etc. But, they typically aren't very large, so for these 1428 * objects use a standard bucket size. For building relocatable 1429 * objects, typically there will be an output relocation for 1430 * every input relocation. 1431 */ 1432 if (nextsize == 0) { 1433 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1434 if ((size = ofl->ofl_relocincnt) == 0) 1435 size = REL_LOIDESCNO; 1436 if (size > REL_HOIDESCNO) 1437 nextsize = REL_HOIDESCNO; 1438 else 1439 nextsize = REL_LOIDESCNO; 1440 } else 1441 nextsize = size = REL_HOIDESCNO; 1442 } else 1443 size = nextsize; 1444 1445 size = size * sizeof (Rel_desc); 1446 1447 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1448 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1449 return (S_ERROR); 1450 1451 /* LINTED */ 1452 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1453 /* LINTED */ 1454 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1455 } 1456 1457 1458 /* 1459 * If we are adding a output relocation against a section 1460 * symbol (non-RELATIVE) then mark that section. These sections 1461 * will be added to the .dynsym symbol table. 1462 */ 1463 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1464 ((flags & FLG_REL_SCNNDX) || 1465 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1466 1467 /* 1468 * If this is a COMMON symbol - no output section 1469 * exists yet - (it's created as part of sym_validate()). 1470 * So - we mark here that when it's created it should 1471 * be tagged with the FLG_OS_OUTREL flag. 1472 */ 1473 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1474 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1475 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1476 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1477 else 1478 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1479 } else { 1480 Os_desc *osp = sdp->sd_isc->is_osdesc; 1481 1482 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1483 ofl->ofl_dynshdrcnt++; 1484 osp->os_flags |= FLG_OS_OUTREL; 1485 } 1486 } 1487 } 1488 1489 *orsp = *rsp; 1490 orsp->rel_flags |= flags; 1491 1492 rcp->rc_free++; 1493 ofl->ofl_outrelscnt++; 1494 1495 if (flags & FLG_REL_GOT) 1496 ofl->ofl_relocgotsz += (Xword)sizeof (Rela); 1497 else if (flags & FLG_REL_PLT) 1498 ofl->ofl_relocpltsz += (Xword)sizeof (Rela); 1499 else if (flags & FLG_REL_BSS) 1500 ofl->ofl_relocbsssz += (Xword)sizeof (Rela); 1501 else if (flags & FLG_REL_NOINFO) 1502 ofl->ofl_relocrelsz += (Xword)sizeof (Rela); 1503 else 1504 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rela); 1505 1506 if (orsp->rel_rtype == M_R_RELATIVE) 1507 ofl->ofl_relocrelcnt++; 1508 1509 #if defined(_ELF64) 1510 /* 1511 * When building a 64-bit object any R_SPARC_WDISP30 relocation is given 1512 * a plt padding entry, unless we're building a relocatable object 1513 * (ld -r) or -b is in effect. 1514 */ 1515 if ((orsp->rel_rtype == R_SPARC_WDISP30) && 1516 ((ofl->ofl_flags & (FLG_OF_BFLAG | FLG_OF_RELOBJ)) == 0) && 1517 ((orsp->rel_sym->sd_flags & FLG_SY_PLTPAD) == 0)) { 1518 ofl->ofl_pltpad++; 1519 orsp->rel_sym->sd_flags |= FLG_SY_PLTPAD; 1520 } 1521 #endif 1522 /* 1523 * We don't perform sorting on PLT relocations because 1524 * they have already been assigned a PLT index and if we 1525 * were to sort them we would have to re-assign the plt indexes. 1526 */ 1527 if (!(flags & FLG_REL_PLT)) 1528 ofl->ofl_reloccnt++; 1529 1530 /* 1531 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1532 */ 1533 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1534 ofl->ofl_flags |= FLG_OF_BLDGOT; 1535 1536 /* 1537 * Identify and possibly warn of a displacement relocation. 1538 */ 1539 if (orsp->rel_flags & FLG_REL_DISP) { 1540 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1541 1542 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1543 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1544 } 1545 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_RELA, 1546 M_MACH, orsp)); 1547 return (1); 1548 } 1549 1550 /* 1551 * Process relocation against a register symbol. Note, of -z muldefs is in 1552 * effect there may have been multiple register definitions, which would have 1553 * been processed as non-fatal, with the first definition winning. But, we 1554 * will also process multiple relocations for these multiple definitions. In 1555 * this case we must only preserve the relocation for the definition that was 1556 * kept. The sad part is that register relocations don't typically specify 1557 * the register symbol with which they are associated, so we might have to 1558 * search the input files global symbols to determine if this relocation is 1559 * appropriate. 1560 */ 1561 static uintptr_t 1562 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1563 { 1564 if (ofl->ofl_flags & FLG_OF_MULDEFS) { 1565 Ifl_desc * ifl = isp->is_file; 1566 Sym_desc * sdp = rsp->rel_sym; 1567 1568 if (sdp == 0) { 1569 Xword offset = rsp->rel_roffset; 1570 Word ndx; 1571 1572 for (ndx = ifl->ifl_locscnt; 1573 ndx < ifl->ifl_symscnt; ndx++) { 1574 if (((sdp = ifl->ifl_oldndx[ndx]) != 0) && 1575 (sdp->sd_flags & FLG_SY_REGSYM) && 1576 (sdp->sd_sym->st_value == offset)) 1577 break; 1578 } 1579 } 1580 if (sdp && (sdp->sd_file != ifl)) 1581 return (1); 1582 } 1583 return (ld_add_outrel((rsp->rel_flags | FLG_REL_REG), rsp, ofl)); 1584 } 1585 1586 /* 1587 * process relocation for a LOCAL symbol 1588 */ 1589 static uintptr_t 1590 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1591 { 1592 Word flags = ofl->ofl_flags; 1593 Sym_desc *sdp = rsp->rel_sym; 1594 Word shndx = sdp->sd_sym->st_shndx; 1595 1596 /* 1597 * if ((shared object) and (not pc relative relocation) and 1598 * (not against ABS symbol)) 1599 * then 1600 * if (rtype != R_SPARC_32) 1601 * then 1602 * build relocation against section 1603 * else 1604 * build R_SPARC_RELATIVE 1605 * fi 1606 * fi 1607 */ 1608 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1609 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1610 !(IS_GOT_BASED(rsp->rel_rtype)) && 1611 !(rsp->rel_isdesc != NULL && 1612 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1613 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1614 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1615 Word ortype = rsp->rel_rtype; 1616 1617 if ((rsp->rel_rtype != R_SPARC_32) && 1618 (rsp->rel_rtype != R_SPARC_PLT32) && 1619 (rsp->rel_rtype != R_SPARC_64)) 1620 return (ld_add_outrel((FLG_REL_SCNNDX | FLG_REL_ADVAL), 1621 rsp, ofl)); 1622 1623 rsp->rel_rtype = R_SPARC_RELATIVE; 1624 if (ld_add_outrel(FLG_REL_ADVAL, rsp, ofl) == S_ERROR) 1625 return (S_ERROR); 1626 rsp->rel_rtype = ortype; 1627 return (1); 1628 } 1629 1630 /* 1631 * If the relocation is against a 'non-allocatable' section 1632 * and we can not resolve it now - then give a warning 1633 * message. 1634 * 1635 * We can not resolve the symbol if either: 1636 * a) it's undefined 1637 * b) it's defined in a shared library and a 1638 * COPY relocation hasn't moved it to the executable 1639 * 1640 * Note: because we process all of the relocations against the 1641 * text segment before any others - we know whether 1642 * or not a copy relocation will be generated before 1643 * we get here (see reloc_init()->reloc_segments()). 1644 */ 1645 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1646 ((shndx == SHN_UNDEF) || 1647 ((sdp->sd_ref == REF_DYN_NEED) && 1648 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1649 Conv_inv_buf_t inv_buf; 1650 1651 /* 1652 * If the relocation is against a SHT_SUNW_ANNOTATE 1653 * section - then silently ignore that the relocation 1654 * can not be resolved. 1655 */ 1656 if (rsp->rel_osdesc && 1657 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1658 return (0); 1659 (void) eprintf(ofl->ofl_lml, ERR_WARNING, 1660 MSG_INTL(MSG_REL_EXTERNSYM), 1661 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1662 rsp->rel_isdesc->is_file->ifl_name, 1663 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1664 return (1); 1665 } 1666 1667 /* 1668 * Perform relocation. 1669 */ 1670 return (ld_add_actrel(NULL, rsp, ofl)); 1671 } 1672 1673 /* 1674 * Establish a relocation transition. Note, at this point of input relocation 1675 * processing, we have no idea of the relocation value that will be used in 1676 * the eventual relocation calculation. This value is only known after the 1677 * initial image has been constructed. Therefore, there is a small chance 1678 * that a value can exceed the capabilities of the transitioned relocation. 1679 * One example might be the offset from the GOT to a symbol. 1680 * 1681 * The only instance of this failure discovered so far has been via the use of 1682 * ABS symbols to represent an external memory location. This situation is 1683 * rare, since ABS symbols aren't typically generated by the compilers. 1684 * Therefore, our solution is to excluded ABS symbols from the transition 1685 * relocation possibilities. As an additional safeguard, if an inappropriate 1686 * value is passed to the final relocation engine, a verification ("V") 1687 * relocation should trigger a fatal error condition. 1688 */ 1689 static uintptr_t 1690 ld_reloc_GOTOP(Boolean local, Rel_desc *rsp, Ofl_desc *ofl) 1691 { 1692 Word rtype = rsp->rel_rtype; 1693 1694 if (!local || (rsp->rel_sym->sd_sym->st_shndx == SHN_ABS)) { 1695 /* 1696 * When binding to a external symbol, no fixups are required 1697 * and the GOTDATA_OP relocation can be ignored. 1698 */ 1699 if (rtype == R_SPARC_GOTDATA_OP) 1700 return (1); 1701 return (ld_reloc_GOT_relative(local, rsp, ofl)); 1702 } 1703 1704 /* 1705 * When binding to a local symbol the relocations can be transitioned: 1706 * 1707 * R_*_GOTDATA_OP_HIX22 -> R_*_GOTDATA_HIX22 1708 * R_*_GOTDATA_OP_LOX10 -> R_*_GOTDATA_LOX10 1709 * R_*_GOTDATA_OP -> instruction fixup 1710 */ 1711 return (ld_add_actrel(FLG_REL_GOTFIX, rsp, ofl)); 1712 } 1713 1714 static uintptr_t 1715 ld_reloc_TLS(Boolean local, Rel_desc *rsp, Ofl_desc *ofl) 1716 { 1717 Word rtype = rsp->rel_rtype; 1718 Sym_desc *sdp = rsp->rel_sym; 1719 Word flags = ofl->ofl_flags; 1720 Gotndx *gnp; 1721 1722 /* 1723 * If we're building an executable - use either the IE or LE access 1724 * model. If we're building a shared object process any IE model. 1725 */ 1726 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1727 /* 1728 * Set the DF_STATIC_TLS flag. 1729 */ 1730 ofl->ofl_dtflags |= DF_STATIC_TLS; 1731 1732 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1733 /* 1734 * When processing static TLS - these relocations 1735 * can be ignored. 1736 */ 1737 if ((rtype == R_SPARC_TLS_IE_LD) || 1738 (rtype == R_SPARC_TLS_IE_LDX) || 1739 (rtype == R_SPARC_TLS_IE_ADD)) 1740 return (1); 1741 1742 /* 1743 * Assign a GOT entry for IE static TLS references. 1744 */ 1745 if (((rtype == R_SPARC_TLS_GD_HI22) || 1746 (rtype == R_SPARC_TLS_GD_LO10) || 1747 (rtype == R_SPARC_TLS_IE_HI22) || 1748 (rtype == R_SPARC_TLS_IE_LO10)) && 1749 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1750 GOT_REF_TLSIE, ofl, rsp)) == 0)) { 1751 1752 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1753 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1754 rtype, M_R_TPOFF, 0) == S_ERROR) 1755 return (S_ERROR); 1756 } 1757 1758 /* 1759 * IE access model. 1760 */ 1761 if (IS_TLS_IE(rtype)) 1762 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1763 1764 /* 1765 * Fixups are required for other executable models. 1766 */ 1767 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1768 rsp, ofl)); 1769 } 1770 1771 /* 1772 * LE access model. 1773 */ 1774 if (IS_TLS_LE(rtype)) 1775 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1776 1777 /* 1778 * When processing static TLS - these relocations can be 1779 * ignored. 1780 */ 1781 if (rtype == R_SPARC_TLS_IE_ADD) 1782 return (1); 1783 1784 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1785 rsp, ofl)); 1786 } 1787 1788 /* 1789 * Building a shared object. 1790 * 1791 * For dynamic TLS references, ADD relocations are ignored. 1792 */ 1793 if ((rtype == R_SPARC_TLS_GD_ADD) || (rtype == R_SPARC_TLS_LDM_ADD) || 1794 (rtype == R_SPARC_TLS_LDO_ADD)) 1795 return (1); 1796 1797 /* 1798 * Assign a GOT entry for a dynamic TLS reference. 1799 */ 1800 if (((rtype == R_SPARC_TLS_LDM_HI22) || 1801 (rtype == R_SPARC_TLS_LDM_LO10)) && 1802 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSLD, 1803 ofl, rsp)) == 0)) { 1804 1805 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1806 FLG_REL_MTLS, rtype, M_R_DTPMOD, 0) == S_ERROR) 1807 return (S_ERROR); 1808 1809 } else if (((rtype == R_SPARC_TLS_GD_HI22) || 1810 (rtype == R_SPARC_TLS_GD_LO10)) && 1811 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1812 ofl, rsp)) == 0)) { 1813 1814 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1815 FLG_REL_DTLS, rtype, M_R_DTPMOD, M_R_DTPOFF) == S_ERROR) 1816 return (S_ERROR); 1817 } 1818 1819 /* 1820 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1821 * cause a call to __tls_get_addr(). Convert this relocation to that 1822 * symbol now, and prepare for the PLT magic. 1823 */ 1824 if ((rtype == R_SPARC_TLS_GD_CALL) || (rtype == R_SPARC_TLS_LDM_CALL)) { 1825 Sym_desc *tlsgetsym; 1826 1827 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_U), 1828 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1829 return (S_ERROR); 1830 1831 rsp->rel_sym = tlsgetsym; 1832 rsp->rel_sname = tlsgetsym->sd_name; 1833 rsp->rel_rtype = R_SPARC_WPLT30; 1834 1835 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1836 return (S_ERROR); 1837 1838 rsp->rel_sym = sdp; 1839 rsp->rel_sname = sdp->sd_name; 1840 rsp->rel_rtype = rtype; 1841 return (1); 1842 } 1843 1844 if (IS_TLS_LD(rtype)) 1845 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1846 1847 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1848 } 1849 1850 /* 1851 * ld_allocate_got: if a GOT is to be made, after the section is built this 1852 * function is called to allocate all the GOT slots. The allocation is 1853 * deferred until after all GOTs have been counted and sorted according 1854 * to their size, for only then will we know how to allocate them on 1855 * a processor like SPARC which has different models for addressing the 1856 * GOT. SPARC has two: small and large, small uses a signed 13-bit offset 1857 * into the GOT, whereas large uses an unsigned 32-bit offset. 1858 */ 1859 static Sword small_index; /* starting index for small GOT entries */ 1860 static Sword mixed_index; /* starting index for mixed GOT entries */ 1861 static Sword large_index; /* starting index for large GOT entries */ 1862 1863 static uintptr_t 1864 ld_assign_got(Ofl_desc *ofl, Sym_desc * sdp) 1865 { 1866 Listnode * lnp; 1867 Gotndx * gnp; 1868 1869 for (LIST_TRAVERSE(&sdp->sd_GOTndxs, lnp, gnp)) { 1870 uint_t gotents; 1871 Gotref gref; 1872 gref = gnp->gn_gotref; 1873 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1874 gotents = 2; 1875 else 1876 gotents = 1; 1877 1878 switch (gnp->gn_gotndx) { 1879 case M_GOT_SMALL: 1880 gnp->gn_gotndx = small_index; 1881 small_index += gotents; 1882 if (small_index == 0) 1883 small_index = M_GOT_XNumber; 1884 break; 1885 case M_GOT_MIXED: 1886 gnp->gn_gotndx = mixed_index; 1887 mixed_index += gotents; 1888 break; 1889 case M_GOT_LARGE: 1890 gnp->gn_gotndx = large_index; 1891 large_index += gotents; 1892 break; 1893 default: 1894 eprintf(ofl->ofl_lml, ERR_FATAL, 1895 MSG_INTL(MSG_REL_ASSIGNGOT), 1896 EC_XWORD(gnp->gn_gotndx), demangle(sdp->sd_name)); 1897 return (S_ERROR); 1898 } 1899 } 1900 return (1); 1901 } 1902 1903 /* 1904 * Search the GOT index list for a GOT entry with the proper addend. 1905 */ 1906 static Gotndx * 1907 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1908 { 1909 Listnode * lnp; 1910 Gotndx * gnp; 1911 1912 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1913 return (ofl->ofl_tlsldgotndx); 1914 1915 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1916 if ((rdesc->rel_raddend == gnp->gn_addend) && 1917 (gref == gnp->gn_gotref)) 1918 return (gnp); 1919 } 1920 return ((Gotndx *)0); 1921 } 1922 1923 static Xword 1924 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1925 { 1926 Os_desc *osp = ofl->ofl_osgot; 1927 Sym_desc *sdp = rdesc->rel_sym; 1928 Xword gotndx; 1929 Gotref gref; 1930 Gotndx *gnp; 1931 1932 if (rdesc->rel_flags & FLG_REL_DTLS) 1933 gref = GOT_REF_TLSGD; 1934 else if (rdesc->rel_flags & FLG_REL_MTLS) 1935 gref = GOT_REF_TLSLD; 1936 else if (rdesc->rel_flags & FLG_REL_STLS) 1937 gref = GOT_REF_TLSIE; 1938 else 1939 gref = GOT_REF_GENERIC; 1940 1941 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, rdesc); 1942 assert(gnp); 1943 1944 gotndx = (Xword)gnp->gn_gotndx; 1945 1946 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1947 (rdesc->rel_rtype == M_R_DTPOFF)) 1948 gotndx++; 1949 1950 return ((Xword)((osp->os_shdr->sh_addr) + (gotndx * M_GOT_ENTSIZE) + 1951 (-neggotoffset * M_GOT_ENTSIZE))); 1952 } 1953 1954 static uintptr_t 1955 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1956 Rel_desc * rsp, Sym_desc * sdp) 1957 { 1958 Xword raddend; 1959 Gotndx * gnp, * _gnp; 1960 Listnode * lnp, * plnp; 1961 uint_t gotents; 1962 1963 /* Some TLS requires two relocations with two GOT entries */ 1964 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1965 gotents = 2; 1966 else 1967 gotents = 1; 1968 1969 raddend = rsp->rel_raddend; 1970 if (pgnp && (pgnp->gn_addend == raddend) && (pgnp->gn_gotref == gref)) { 1971 1972 /* 1973 * If an entry for this addend already exists, determine if it 1974 * has mixed mode GOT access (both PIC and pic). 1975 * 1976 * In order to be accessible by both large and small pic, 1977 * a mixed mode GOT must be located in the positive index 1978 * range above _GLOBAL_OFFSET_TABLE_, and in the range 1979 * reachable small pic. This is necessary because the large 1980 * PIC mode cannot use a negative offset. This implies that 1981 * there can be no more than (M_GOT_MAXSMALL/2 - M_GOT_XNumber) 1982 * such entries. 1983 */ 1984 switch (pgnp->gn_gotndx) { 1985 case M_GOT_SMALL: 1986 /* 1987 * This one was previously identified as a small 1988 * GOT. If this access is large, then convert 1989 * it to mixed. 1990 */ 1991 if (rsp->rel_rtype != R_SPARC_GOT13) { 1992 pgnp->gn_gotndx = M_GOT_MIXED; 1993 mixgotcnt += gotents; 1994 } 1995 break; 1996 1997 case M_GOT_LARGE: 1998 /* 1999 * This one was previously identified as a large 2000 * GOT. If this access is small, convert it to mixed. 2001 */ 2002 if (rsp->rel_rtype == R_SPARC_GOT13) { 2003 smlgotcnt += gotents; 2004 mixgotcnt += gotents; 2005 pgnp->gn_gotndx = M_GOT_MIXED; 2006 sdp->sd_flags |= FLG_SY_SMGOT; 2007 } 2008 break; 2009 } 2010 return (1); 2011 } 2012 2013 plnp = 0; 2014 for (LIST_TRAVERSE(lst, lnp, _gnp)) { 2015 if (_gnp->gn_addend > raddend) 2016 break; 2017 plnp = lnp; 2018 } 2019 2020 /* 2021 * Allocate a new entry. 2022 */ 2023 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 2024 return (S_ERROR); 2025 gnp->gn_addend = raddend; 2026 gnp->gn_gotref = gref; 2027 ofl->ofl_gotcnt += gotents; 2028 2029 if (rsp->rel_rtype == R_SPARC_GOT13) { 2030 gnp->gn_gotndx = M_GOT_SMALL; 2031 smlgotcnt += gotents; 2032 sdp->sd_flags |= FLG_SY_SMGOT; 2033 } else { 2034 gnp->gn_gotndx = M_GOT_LARGE; 2035 } 2036 2037 if (gref == GOT_REF_TLSLD) { 2038 ofl->ofl_tlsldgotndx = gnp; 2039 return (1); 2040 } 2041 2042 if (plnp == 0) { 2043 /* 2044 * Insert at head of list 2045 */ 2046 if (list_prependc(lst, (void *)gnp) == 0) 2047 return (S_ERROR); 2048 } else if (_gnp->gn_addend > raddend) { 2049 /* 2050 * Insert in middle of lest 2051 */ 2052 if (list_insertc(lst, (void *)gnp, plnp) == 0) 2053 return (S_ERROR); 2054 } else { 2055 /* 2056 * Append to tail of list 2057 */ 2058 if (list_appendc(lst, (void *)gnp) == 0) 2059 return (S_ERROR); 2060 } 2061 return (1); 2062 } 2063 2064 static void 2065 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 2066 { 2067 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 2068 } 2069 2070 2071 static uintptr_t 2072 ld_allocate_got(Ofl_desc * ofl) 2073 { 2074 const Sword first_large_ndx = M_GOT_MAXSMALL / 2; 2075 Sym_desc * sdp; 2076 Addr addr; 2077 2078 /* 2079 * Sanity check -- is this going to fit at all? There are two 2080 * limits to be concerned about: 2081 * 1) There is a limit on the number of small pic GOT indices, 2082 * given by M_GOT_MAXSMALL. 2083 * 2) If there are more than (M_GOT_MAXSMALL/2 - M_GOT_XNumber) 2084 * small GOT indices, there will be items at negative 2085 * offsets from _GLOBAL_OFFSET_TABLE_. Items that are 2086 * accessed via large (PIC) code cannot reach these 2087 * negative slots, so mixed mode items must be in the 2088 * non-negative range. This implies a limit of 2089 * (M_GOT_MAXSMALL/2 - M_GOT_XNumber) mixed mode indices. 2090 */ 2091 if (smlgotcnt > M_GOT_MAXSMALL) { 2092 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_SMALLGOT), 2093 EC_WORD(smlgotcnt), M_GOT_MAXSMALL); 2094 return (S_ERROR); 2095 } 2096 if (mixgotcnt > (first_large_ndx - M_GOT_XNumber)) { 2097 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_MIXEDGOT), 2098 EC_WORD(mixgotcnt), first_large_ndx - M_GOT_XNumber); 2099 return (S_ERROR); 2100 } 2101 2102 /* 2103 * Set starting offset to be either 0, or a negative index into 2104 * the GOT based on the number of small symbols we've got. 2105 */ 2106 neggotoffset = ((smlgotcnt >= first_large_ndx) ? 2107 (first_large_ndx - smlgotcnt) : 0); 2108 2109 /* 2110 * Initialize the got offsets used by assign_got() to 2111 * locate GOT items: 2112 * small - Starting index of items referenced only 2113 * by small offsets (-Kpic). 2114 * mixed - Starting index of items referenced 2115 * by both large (-KPIC) and small (-Kpic). 2116 * large - Indexes referenced only by large (-KPIC) 2117 * 2118 * Small items can have negative indexes (i.e. lie below 2119 * _GLOBAL_OFFSET_TABLE_). Mixed and large items must have 2120 * non-negative offsets. 2121 */ 2122 small_index = (neggotoffset == 0) ? M_GOT_XNumber : neggotoffset; 2123 large_index = neggotoffset + smlgotcnt; 2124 mixed_index = large_index - mixgotcnt; 2125 2126 /* 2127 * Assign bias to GOT symbols. 2128 */ 2129 addr = -neggotoffset * M_GOT_ENTSIZE; 2130 if (sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL), SYM_NOHASH, 0, ofl)) 2131 sdp->sd_sym->st_value = addr; 2132 if (sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL_U), SYM_NOHASH, 0, ofl)) 2133 sdp->sd_sym->st_value = addr; 2134 2135 if (ofl->ofl_tlsldgotndx) { 2136 ofl->ofl_tlsldgotndx->gn_gotndx = large_index; 2137 large_index += 2; 2138 } 2139 return (1); 2140 } 2141 2142 /* 2143 * Initializes .got[0] with the _DYNAMIC symbol value. 2144 */ 2145 static uintptr_t 2146 ld_fillin_gotplt(Ofl_desc *ofl) 2147 { 2148 if (ofl->ofl_osgot) { 2149 Sym_desc *sdp; 2150 2151 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 2152 SYM_NOHASH, 0, ofl)) != NULL) { 2153 uchar_t *genptr; 2154 2155 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 2156 (-neggotoffset * M_GOT_ENTSIZE) + 2157 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 2158 /* LINTED */ 2159 *((Xword *)genptr) = sdp->sd_sym->st_value; 2160 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 2161 /* LINTED */ 2162 *((Xword *)genptr) = 2163 /* LINTED */ 2164 ld_bswap_Xword(*((Xword *)genptr)); 2165 } 2166 } 2167 return (1); 2168 } 2169 2170 2171 2172 /* 2173 * Template for generating "void (*)(void)" function 2174 */ 2175 static const uchar_t nullfunc_tmpl[] = { 2176 /* 0x00 */ 0x81, 0xc3, 0xe0, 0x08, /* retl */ 2177 /* 0x04 */ 0x01, 0x00, 0x00, 0x00 /* nop */ 2178 }; 2179 2180 2181 2182 /* 2183 * Return the ld_targ definition for this target. 2184 */ 2185 const Target * 2186 ld_targ_init_sparc(void) 2187 { 2188 static const Target _ld_targ = { 2189 { /* Target_mach */ 2190 M_MACH, /* m_mach */ 2191 M_MACHPLUS, /* m_machplus */ 2192 M_FLAGSPLUS, /* m_flagsplus */ 2193 M_CLASS, /* m_class */ 2194 M_DATA, /* m_data */ 2195 2196 M_SEGM_ALIGN, /* m_segm_align */ 2197 M_SEGM_ORIGIN, /* m_segm_origin */ 2198 M_DATASEG_PERM, /* m_dataseg_perm */ 2199 M_WORD_ALIGN, /* m_word_align */ 2200 /* m_def_interp */ 2201 #if defined(_ELF64) 2202 MSG_ORIG(MSG_PTH_RTLD_SPARCV9), 2203 #else 2204 MSG_ORIG(MSG_PTH_RTLD), 2205 #endif 2206 2207 /* Relocation type codes */ 2208 M_R_ARRAYADDR, /* m_r_arrayaddr */ 2209 M_R_COPY, /* m_r_copy */ 2210 M_R_GLOB_DAT, /* m_r_glob_dat */ 2211 M_R_JMP_SLOT, /* m_r_jmp_slot */ 2212 M_R_NUM, /* m_r_num */ 2213 M_R_NONE, /* m_r_none */ 2214 M_R_RELATIVE, /* m_r_relative */ 2215 M_R_REGISTER, /* m_r_register */ 2216 2217 /* Relocation related constants */ 2218 M_REL_DT_COUNT, /* m_rel_dt_count */ 2219 M_REL_DT_ENT, /* m_rel_dt_ent */ 2220 M_REL_DT_SIZE, /* m_rel_dt_size */ 2221 M_REL_DT_TYPE, /* m_rel_dt_type */ 2222 M_REL_SHT_TYPE, /* m_rel_sht_type */ 2223 2224 /* GOT related constants */ 2225 M_GOT_ENTSIZE, /* m_got_entsize */ 2226 M_GOT_XNumber, /* m_got_xnumber */ 2227 2228 /* PLT related constants */ 2229 M_PLT_ALIGN, /* m_plt_align */ 2230 M_PLT_ENTSIZE, /* m_plt_entsize */ 2231 M_PLT_RESERVSZ, /* m_plt_reservsz */ 2232 M_PLT_SHF_FLAGS, /* m_plt_shf_flags */ 2233 2234 M_DT_REGISTER, /* m_dt_register */ 2235 }, 2236 { /* Target_machid */ 2237 M_ID_ARRAY, /* id_array */ 2238 M_ID_BSS, /* id_bss */ 2239 M_ID_CAP, /* id_cap */ 2240 M_ID_DATA, /* id_data */ 2241 M_ID_DYNAMIC, /* id_dynamic */ 2242 M_ID_DYNSORT, /* id_dynsort */ 2243 M_ID_DYNSTR, /* id_dynstr */ 2244 M_ID_DYNSYM, /* id_dynsym */ 2245 M_ID_DYNSYM_NDX, /* id_dynsym_ndx */ 2246 M_ID_GOT, /* id_got */ 2247 M_ID_GOTDATA, /* id_gotdata */ 2248 M_ID_HASH, /* id_hash */ 2249 M_ID_INTERP, /* id_interp */ 2250 M_ID_UNKNOWN, /* id_lbss (unused) */ 2251 M_ID_LDYNSYM, /* id_ldynsym */ 2252 M_ID_NOTE, /* id_note */ 2253 M_ID_NULL, /* id_null */ 2254 M_ID_PLT, /* id_plt */ 2255 M_ID_REL, /* id_rel */ 2256 M_ID_STRTAB, /* id_strtab */ 2257 M_ID_SYMINFO, /* id_syminfo */ 2258 M_ID_SYMTAB, /* id_symtab */ 2259 M_ID_SYMTAB_NDX, /* id_symtab_ndx */ 2260 M_ID_TEXT, /* id_text */ 2261 M_ID_TLS, /* id_tls */ 2262 M_ID_TLSBSS, /* id_tlsbss */ 2263 M_ID_UNKNOWN, /* id_unknown */ 2264 M_ID_UNKNOWN, /* id_unwind (unused) */ 2265 M_ID_USER, /* id_user */ 2266 M_ID_VERSION, /* id_version */ 2267 }, 2268 { /* Target_nullfunc */ 2269 nullfunc_tmpl, /* nf_template */ 2270 sizeof (nullfunc_tmpl), /* nf_size */ 2271 }, 2272 { /* Target_machrel */ 2273 reloc_table, 2274 2275 ld_init_rel, /* mr_init_rel */ 2276 ld_mach_eflags, /* mr_mach_eflags */ 2277 ld_mach_make_dynamic, /* mr_mach_make_dynamic */ 2278 ld_mach_update_odynamic, /* mr_mach_update_odynamic */ 2279 ld_calc_plt_addr, /* mr_calc_plt_addr */ 2280 ld_perform_outreloc, /* mr_perform_outreloc */ 2281 ld_do_activerelocs, /* mr_do_activerelocs */ 2282 ld_add_outrel, /* mr_add_outrel */ 2283 ld_reloc_register, /* mr_reloc_register */ 2284 ld_reloc_local, /* mr_reloc_local */ 2285 ld_reloc_GOTOP, /* mr_reloc_GOTOP */ 2286 ld_reloc_TLS, /* mr_reloc_TLS */ 2287 ld_assign_got, /* mr_assign_got */ 2288 ld_find_gotndx, /* mr_find_gotndx */ 2289 ld_calc_got_offset, /* mr_calc_got_offset */ 2290 ld_assign_got_ndx, /* mr_assign_got_ndx */ 2291 ld_assign_plt_ndx, /* mr_assign_plt_ndx */ 2292 ld_allocate_got, /* mr_allocate_got */ 2293 ld_fillin_gotplt, /* mr_fillin_gotplt */ 2294 }, 2295 { /* Target_machsym */ 2296 ld_reg_check_sparc, /* ms_reg_check */ 2297 ld_mach_sym_typecheck_sparc, /* ms_mach_sym_typecheck */ 2298 ld_is_regsym_sparc, /* ms_is_regsym */ 2299 ld_reg_find_sparc, /* ms_reg_find */ 2300 ld_reg_enter_sparc /* ms_reg_enter */ 2301 }, 2302 { /* Target_unwind */ 2303 NULL, /* uw_make_unwindhdr */ 2304 NULL, /* uw_populate_unwindhdr */ 2305 NULL, /* uw_append_unwind */ 2306 } 2307 }; 2308 2309 return (&_ld_targ); 2310 } 2311