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 2009 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 /* Get the sparc version of the relocation engine */ 31 #define DO_RELOC_LIBLD_SPARC 32 33 #include <string.h> 34 #include <stdio.h> 35 #include <sys/elf_SPARC.h> 36 #include <debug.h> 37 #include <reloc.h> 38 #include <sparc/machdep_sparc.h> 39 #include "msg.h" 40 #include "_libld.h" 41 #include "machsym.sparc.h" 42 43 /* Forward declarations */ 44 static Xword ld_calc_got_offset(Rel_desc *, Ofl_desc *); 45 static Gotndx *ld_find_gotndx(List *, Gotref, Ofl_desc *, Rel_desc *); 46 47 /* 48 * Local Variable Definitions 49 */ 50 static Sword neggotoffset = 0; /* off. of GOT table from GOT symbol */ 51 static Sword smlgotcnt = M_GOT_XNumber; /* no. of small GOT symbols */ 52 static Sword mixgotcnt = 0; /* # syms with both large/small GOT */ 53 54 static Word 55 ld_init_rel(Rel_desc *reld, void *reloc) 56 { 57 Rela * rela = (Rela *)reloc; 58 59 /* LINTED */ 60 reld->rel_rtype = (Word)ELF_R_TYPE(rela->r_info, M_MACH); 61 reld->rel_roffset = rela->r_offset; 62 reld->rel_raddend = rela->r_addend; 63 reld->rel_typedata = (Word)ELF_R_TYPE_DATA(rela->r_info); 64 65 reld->rel_flags |= FLG_REL_RELA; 66 67 return ((Word)ELF_R_SYM(rela->r_info)); 68 } 69 70 static void 71 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl) 72 { 73 Word eflags = ofl->ofl_dehdr->e_flags; 74 Word memopt1, memopt2; 75 static int firstpass; 76 77 /* 78 * If a *PLUS relocatable is included, the output object is type *PLUS. 79 */ 80 if ((ehdr->e_machine == EM_SPARC32PLUS) && 81 (ehdr->e_flags & EF_SPARC_32PLUS)) 82 ofl->ofl_dehdr->e_machine = EM_SPARC32PLUS; 83 84 /* 85 * On the first pass, we don't yet have a memory model to compare 86 * against, therefore the initial file becomes our baseline. Subsequent 87 * passes will do the comparison described below. 88 */ 89 if (firstpass == 0) { 90 ofl->ofl_dehdr->e_flags |= ehdr->e_flags; 91 firstpass++; 92 return; 93 } 94 95 /* 96 * Determine which memory model to mark the binary with. The options 97 * are (most restrictive to least): 98 * 99 * EF_SPARCV9_TSO 0x0 Total Store Order 100 * EF_SPARCV9_PSO 0x1 Partial Store Order 101 * EF_SPARCV9_RMO 0x2 Relaxed Memory Order 102 * 103 * Mark the binary with the most restrictive option encountered from a 104 * relocatable object included in the link. 105 */ 106 eflags |= (ehdr->e_flags & ~EF_SPARCV9_MM); 107 memopt1 = eflags & EF_SPARCV9_MM; 108 memopt2 = ehdr->e_flags & EF_SPARCV9_MM; 109 eflags &= ~EF_SPARCV9_MM; 110 111 if ((memopt1 == EF_SPARCV9_TSO) || (memopt2 == EF_SPARCV9_TSO)) 112 /* EMPTY */ 113 ; 114 else if ((memopt1 == EF_SPARCV9_PSO) || (memopt2 == EF_SPARCV9_PSO)) 115 eflags |= EF_SPARCV9_PSO; 116 else 117 eflags |= EF_SPARCV9_RMO; 118 119 ofl->ofl_dehdr->e_flags = eflags; 120 } 121 122 static void 123 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt) 124 { 125 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) { 126 /* 127 * Create this entry if we are going to create a PLT table. 128 */ 129 if (ofl->ofl_pltcnt) 130 (*cnt)++; /* DT_PLTGOT */ 131 } 132 } 133 134 static void 135 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn) 136 { 137 if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) { 138 (*dyn)->d_tag = DT_PLTGOT; 139 if (ofl->ofl_osplt) 140 (*dyn)->d_un.d_ptr = ofl->ofl_osplt->os_shdr->sh_addr; 141 else 142 (*dyn)->d_un.d_ptr = 0; 143 (*dyn)++; 144 } 145 } 146 147 #if defined(_ELF64) 148 149 static Xword 150 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 151 { 152 Xword value, pltndx, farpltndx; 153 154 pltndx = sdp->sd_aux->sa_PLTndx + M_PLT_XNumber - 1; 155 156 if ((pltndx) < M64_PLT_NEARPLTS) { 157 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 158 (pltndx * M_PLT_ENTSIZE); 159 return (value); 160 } 161 162 farpltndx = pltndx - M64_PLT_NEARPLTS; 163 164 /* 165 * pltoffset of a far plt is calculated by: 166 * 167 * <size of near plt table> + 168 * <size of preceding far plt blocks> + 169 * <blockndx * sizeof (far plt entsize)> 170 */ 171 value = 172 /* size of near plt table */ 173 (M64_PLT_NEARPLTS * M_PLT_ENTSIZE) + 174 /* size of preceding far plt blocks */ 175 ((farpltndx / M64_PLT_FBLKCNTS) * 176 ((M64_PLT_FENTSIZE + sizeof (Addr)) * 177 M64_PLT_FBLKCNTS)) + 178 /* pltblockendx * fentsize */ 179 ((farpltndx % M64_PLT_FBLKCNTS) * M64_PLT_FENTSIZE); 180 181 value += (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 182 return (value); 183 } 184 185 /* 186 * Instructions required for Far PLT's 187 */ 188 static uchar_t farplt_instrs[24] = { 189 0x8a, 0x10, 0x00, 0x0f, /* mov %o7, %g5 */ 190 0x40, 0x00, 0x00, 0x02, /* call . + 0x8 */ 191 0x01, 0x00, 0x00, 0x00, /* nop */ 192 0xc2, 0x5b, 0xe0, 0x00, /* ldx [%o7 + 0], %g1 */ 193 0x83, 0xc3, 0xc0, 0x01, /* jmpl %o7 + %g1, %g1 */ 194 0x9e, 0x10, 0x00, 0x05 /* mov %g5, %o7 */ 195 }; 196 197 /* 198 * Far PLT'S: 199 * 200 * Far PLT's are established in blocks of '160' at a time. These 201 * PLT's consist of 6 instructions (24 bytes) and 1 pointer (8 bytes). 202 * The instructions are collected together in blocks of 160 entries 203 * followed by 160 pointers. The last group of entries and pointers 204 * may contain less then 160 items. No padding is required. 205 * 206 * .PLT32768: 207 * mov %o7, %g5 208 * call . + 8 209 * nop 210 * ldx [%o7 + .PLTP32768 - (.PLT32768 + 4)], %g1 211 * jmpl %o7 + %g1, %g1 212 * mov %g5, %o7 213 * ................................ 214 * .PLT32927: 215 * mov %o7, %g5 216 * call . + 8 217 * nop 218 * ldx [%o7 + .PLTP32927 - (.PLT32927 + 4)], %g1 219 * jmpl %o7 + %g1, %g1 220 * mov %g5, %o7 221 * .PLTP32768: 222 * .xword .PLT0-(.PLT32768+4) 223 * ................................ 224 * .PLTP32927: 225 * .xword .PLT0-(.PLT32927+4) 226 * 227 */ 228 static void 229 plt_far_entry(Ofl_desc *ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 230 { 231 uint_t blockndx; /* # of far PLT blocks */ 232 uint_t farblkcnt; /* Index to far PLT block */ 233 Xword farpltndx; /* index of Far Plt */ 234 Xword farpltblkndx; /* index of PLT in BLOCK */ 235 uint32_t *pltent; /* ptr to plt instr. sequence */ 236 uint64_t *pltentptr; /* ptr to plt addr ptr */ 237 Sxword pltblockoff; /* offset to Far plt block */ 238 Sxword pltoff; /* offset to PLT instr. sequence */ 239 Sxword pltptroff; /* offset to PLT addr ptr */ 240 uchar_t *pltbuf; /* ptr to PLT's in file */ 241 242 243 farblkcnt = ((ofl->ofl_pltcnt - 1 + 244 M_PLT_XNumber - M64_PLT_NEARPLTS) / M64_PLT_FBLKCNTS); 245 246 /* 247 * Determine the 'Far' PLT index. 248 */ 249 farpltndx = pltndx - 1 + M_PLT_XNumber - M64_PLT_NEARPLTS; 250 farpltblkndx = farpltndx % M64_PLT_FBLKCNTS; 251 252 /* 253 * Determine what FPLT block this plt falls into. 254 */ 255 blockndx = (uint_t)(farpltndx / M64_PLT_FBLKCNTS); 256 257 /* 258 * Calculate the starting offset of the Far PLT block 259 * that this PLT is a member of. 260 */ 261 pltblockoff = (M64_PLT_NEARPLTS * M_PLT_ENTSIZE) + 262 (blockndx * M64_PLT_FBLOCKSZ); 263 264 pltoff = pltblockoff + 265 (farpltblkndx * M64_PLT_FENTSIZE); 266 267 pltptroff = pltblockoff; 268 269 270 if (farblkcnt > blockndx) { 271 /* 272 * If this is a full block - the 'pltptroffs' start 273 * after 160 fplts. 274 */ 275 pltptroff += (M64_PLT_FBLKCNTS * M64_PLT_FENTSIZE) + 276 (farpltblkndx * M64_PLT_PSIZE); 277 } else { 278 Xword lastblkpltndx; 279 /* 280 * If this is the last block - the the pltptr's start 281 * after the last FPLT instruction sequence. 282 */ 283 lastblkpltndx = (ofl->ofl_pltcnt - 1 + M_PLT_XNumber - 284 M64_PLT_NEARPLTS) % M64_PLT_FBLKCNTS; 285 pltptroff += ((lastblkpltndx + 1) * M64_PLT_FENTSIZE) + 286 (farpltblkndx * M64_PLT_PSIZE); 287 } 288 pltbuf = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 289 290 /* 291 * For far-plts, the Raddend and Roffset fields are defined 292 * to be: 293 * 294 * roffset: address of .PLTP# 295 * raddend: -(.PLT#+4) 296 */ 297 *roffset = pltptroff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 298 *raddend = -(pltoff + 4 + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr)); 299 300 /* LINTED */ 301 pltent = (uint32_t *)(pltbuf + pltoff); 302 /* LINTED */ 303 pltentptr = (uint64_t *)(pltbuf + pltptroff); 304 (void) memcpy(pltent, farplt_instrs, sizeof (farplt_instrs)); 305 306 /* 307 * update 308 * ldx [%o7 + 0], %g1 309 * to 310 * ldx [%o7 + .PLTP# - (.PLT# + 4)], %g1 311 */ 312 /* LINTED */ 313 pltent[3] |= (uint32_t)(pltptroff - (pltoff + 4)); 314 315 /* 316 * Store: 317 * .PLTP# 318 * .xword .PLT0 - .PLT# + 4 319 */ 320 *pltentptr = -(pltoff + 4); 321 } 322 323 /* 324 * Build a single V9 P.L.T. entry - code is: 325 * 326 * For Target Addresses +/- 4GB of the entry 327 * ----------------------------------------- 328 * sethi (. - .PLT0), %g1 329 * ba,a %xcc, .PLT1 330 * nop 331 * nop 332 * nop 333 * nop 334 * nop 335 * nop 336 * 337 * For Target Addresses +/- 2GB of the entry 338 * ----------------------------------------- 339 * 340 * .PLT0 is the address of the first entry in the P.L.T. 341 * This one is filled in by the run-time link editor. We just 342 * have to leave space for it. 343 */ 344 static void 345 plt_entry(Ofl_desc *ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 346 { 347 uchar_t *pltent; /* PLT entry being created. */ 348 Sxword pltoff; /* Offset of this entry from PLT top */ 349 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 350 351 /* 352 * The second part of the V9 ABI (sec. 5.2.4) 353 * applies to plt entries greater than 0x8000 (32,768). 354 * This is handled in 'plt_far_entry()' 355 */ 356 if ((pltndx - 1 + M_PLT_XNumber) >= M64_PLT_NEARPLTS) { 357 plt_far_entry(ofl, pltndx, roffset, raddend); 358 return; 359 } 360 361 pltoff = M_PLT_RESERVSZ + (pltndx - 1) * M_PLT_ENTSIZE; 362 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf + pltoff; 363 364 *roffset = pltoff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 365 *raddend = 0; 366 367 /* 368 * PLT[0]: sethi %hi(. - .L0), %g1 369 */ 370 /* LINTED */ 371 *(Word *)pltent = M_SETHIG1 | pltoff; 372 if (bswap) 373 /* LINTED */ 374 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 375 376 /* 377 * PLT[1]: ba,a %xcc, .PLT1 (.PLT1 accessed as a 378 * PC-relative index of longwords). 379 */ 380 pltent += M_PLT_INSSIZE; 381 pltoff += M_PLT_INSSIZE; 382 pltoff = -pltoff; 383 /* LINTED */ 384 *(Word *)pltent = M_BA_A_XCC | 385 (((pltoff + M_PLT_ENTSIZE) >> 2) & S_MASK(19)); 386 if (bswap) 387 /* LINTED */ 388 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 389 390 /* 391 * PLT[2]: sethi 0, %g0 (NOP for delay slot of eventual CTI). 392 */ 393 pltent += M_PLT_INSSIZE; 394 /* LINTED */ 395 *(Word *)pltent = M_NOP; 396 if (bswap) 397 /* LINTED */ 398 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 399 400 /* 401 * PLT[3]: sethi 0, %g0 (NOP for PLT padding). 402 */ 403 pltent += M_PLT_INSSIZE; 404 /* LINTED */ 405 *(Word *)pltent = M_NOP; 406 if (bswap) 407 /* LINTED */ 408 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 409 410 /* 411 * PLT[4]: sethi 0, %g0 (NOP for PLT padding). 412 */ 413 pltent += M_PLT_INSSIZE; 414 /* LINTED */ 415 *(Word *)pltent = M_NOP; 416 if (bswap) 417 /* LINTED */ 418 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 419 420 /* 421 * PLT[5]: sethi 0, %g0 (NOP for PLT padding). 422 */ 423 pltent += M_PLT_INSSIZE; 424 /* LINTED */ 425 *(Word *)pltent = M_NOP; 426 if (bswap) 427 /* LINTED */ 428 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 429 430 /* 431 * PLT[6]: sethi 0, %g0 (NOP for PLT padding). 432 */ 433 pltent += M_PLT_INSSIZE; 434 /* LINTED */ 435 *(Word *)pltent = M_NOP; 436 if (bswap) 437 /* LINTED */ 438 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 439 440 /* 441 * PLT[7]: sethi 0, %g0 (NOP for PLT padding). 442 */ 443 pltent += M_PLT_INSSIZE; 444 /* LINTED */ 445 *(Word *)pltent = M_NOP; 446 if (bswap) 447 /* LINTED */ 448 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 449 } 450 451 452 #else /* Elf 32 */ 453 454 static Xword 455 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 456 { 457 Xword value, pltndx; 458 459 pltndx = sdp->sd_aux->sa_PLTndx + M_PLT_XNumber - 1; 460 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 461 (pltndx * M_PLT_ENTSIZE); 462 return (value); 463 } 464 465 466 /* 467 * Build a single P.L.T. entry - code is: 468 * 469 * sethi (. - .L0), %g1 470 * ba,a .L0 471 * sethi 0, %g0 (nop) 472 * 473 * .L0 is the address of the first entry in the P.L.T. 474 * This one is filled in by the run-time link editor. We just 475 * have to leave space for it. 476 */ 477 static void 478 plt_entry(Ofl_desc * ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 479 { 480 Byte * pltent; /* PLT entry being created. */ 481 Sxword pltoff; /* Offset of this entry from PLT top */ 482 int bswap = (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) != 0; 483 484 pltoff = M_PLT_RESERVSZ + (pltndx - 1) * M_PLT_ENTSIZE; 485 pltent = (Byte *)ofl->ofl_osplt->os_outdata->d_buf + pltoff; 486 487 *roffset = pltoff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 488 *raddend = 0; 489 490 /* 491 * PLT[0]: sethi %hi(. - .L0), %g1 492 */ 493 /* LINTED */ 494 *(Word *)pltent = M_SETHIG1 | pltoff; 495 if (bswap) 496 /* LINTED */ 497 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 498 499 /* 500 * PLT[1]: ba,a .L0 (.L0 accessed as a PC-relative index of longwords) 501 */ 502 pltent += M_PLT_INSSIZE; 503 pltoff += M_PLT_INSSIZE; 504 pltoff = -pltoff; 505 /* LINTED */ 506 *(Word *)pltent = M_BA_A | ((pltoff >> 2) & S_MASK(22)); 507 if (bswap) 508 /* LINTED */ 509 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 510 511 /* 512 * PLT[2]: sethi 0, %g0 (NOP for delay slot of eventual CTI). 513 */ 514 pltent += M_PLT_INSSIZE; 515 /* LINTED */ 516 *(Word *)pltent = M_SETHIG0; 517 if (bswap) 518 /* LINTED */ 519 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 520 521 /* 522 * PLT[3]: sethi 0, %g0 (NOP for PLT padding). 523 */ 524 pltent += M_PLT_INSSIZE; 525 /* LINTED */ 526 *(Word *)pltent = M_SETHIG0; 527 if (bswap) 528 /* LINTED */ 529 *(Word *)pltent = ld_bswap_Word(*(Word *)pltent); 530 } 531 532 #endif /* _ELF64 */ 533 534 static uintptr_t 535 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl) 536 { 537 Os_desc * relosp, * osp = 0; 538 Xword ndx, roffset, value; 539 Sxword raddend; 540 const Rel_entry *rep; 541 Rela rea; 542 char *relbits; 543 Sym_desc * sdp, * psym = (Sym_desc *)0; 544 int sectmoved = 0; 545 Word dtflags1 = ofl->ofl_dtflags_1; 546 ofl_flag_t flags = ofl->ofl_flags; 547 548 raddend = orsp->rel_raddend; 549 sdp = orsp->rel_sym; 550 551 /* 552 * Special case, a regsiter symbol associated with symbol 553 * index 0 is initialized (i.e. relocated) to a constant 554 * in the r_addend field rather than to a symbol value. 555 */ 556 if ((orsp->rel_rtype == M_R_REGISTER) && !sdp) { 557 relosp = ofl->ofl_osrel; 558 relbits = (char *)relosp->os_outdata->d_buf; 559 560 rea.r_info = ELF_R_INFO(0, 561 ELF_R_TYPE_INFO(orsp->rel_typedata, orsp->rel_rtype)); 562 rea.r_offset = orsp->rel_roffset; 563 rea.r_addend = raddend; 564 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, 565 relosp->os_name, orsp->rel_sname)); 566 567 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 568 (void) memcpy((relbits + relosp->os_szoutrels), 569 (char *)&rea, sizeof (Rela)); 570 relosp->os_szoutrels += (Xword)sizeof (Rela); 571 572 return (1); 573 } 574 575 /* 576 * If the section this relocation is against has been discarded 577 * (-zignore), then also discard (skip) the relocation itself. 578 */ 579 if (orsp->rel_isdesc && ((orsp->rel_flags & 580 (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) && 581 (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) { 582 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp)); 583 return (1); 584 } 585 586 /* 587 * If this is a relocation against a move table, or expanded move 588 * table, adjust the relocation entries. 589 */ 590 if (orsp->rel_move) 591 ld_adj_movereloc(ofl, orsp); 592 593 /* 594 * If this is a relocation against a section then we need to adjust the 595 * raddend field to compensate for the new position of the input section 596 * within the new output section. 597 */ 598 if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) { 599 if (ofl->ofl_parsym.head && 600 (sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 601 (psym = ld_am_I_partial(orsp, orsp->rel_raddend))) { 602 /* 603 * If the symbol is moved, adjust the value 604 */ 605 DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym)); 606 sectmoved = 1; 607 if (ofl->ofl_flags & FLG_OF_RELOBJ) 608 raddend = psym->sd_sym->st_value; 609 else 610 raddend = psym->sd_sym->st_value - 611 psym->sd_isc->is_osdesc->os_shdr->sh_addr; 612 /* LINTED */ 613 raddend += (Off)_elf_getxoff(psym->sd_isc->is_indata); 614 if (psym->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 615 raddend += 616 psym->sd_isc->is_osdesc->os_shdr->sh_addr; 617 } else { 618 /* LINTED */ 619 raddend += (Off)_elf_getxoff(sdp->sd_isc->is_indata); 620 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 621 raddend += 622 sdp->sd_isc->is_osdesc->os_shdr->sh_addr; 623 } 624 } 625 626 value = sdp->sd_sym->st_value; 627 628 if (orsp->rel_flags & FLG_REL_GOT) { 629 osp = ofl->ofl_osgot; 630 roffset = ld_calc_got_offset(orsp, ofl); 631 632 } else if (orsp->rel_flags & FLG_REL_PLT) { 633 osp = ofl->ofl_osplt; 634 plt_entry(ofl, sdp->sd_aux->sa_PLTndx, &roffset, &raddend); 635 } else if (orsp->rel_flags & FLG_REL_BSS) { 636 /* 637 * This must be a R_SPARC_COPY. For these set the roffset to 638 * point to the new symbols location. 639 */ 640 osp = ofl->ofl_isbss->is_osdesc; 641 roffset = (Xword)value; 642 643 /* 644 * The raddend doesn't mean anything in an R_SPARC_COPY 645 * relocation. Null it out because it can confuse people. 646 */ 647 raddend = 0; 648 } else if (orsp->rel_flags & FLG_REL_REG) { 649 /* 650 * The offsets of relocations against register symbols 651 * identifiy the register directly - so the offset 652 * does not need to be adjusted. 653 */ 654 roffset = orsp->rel_roffset; 655 } else { 656 osp = orsp->rel_osdesc; 657 658 /* 659 * Calculate virtual offset of reference point; equals offset 660 * into section + vaddr of section for loadable sections, or 661 * offset plus section displacement for nonloadable sections. 662 */ 663 roffset = orsp->rel_roffset + 664 (Off)_elf_getxoff(orsp->rel_isdesc->is_indata); 665 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) 666 roffset += orsp->rel_isdesc->is_osdesc-> 667 os_shdr->sh_addr; 668 } 669 670 if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0)) 671 relosp = ofl->ofl_osrel; 672 673 /* 674 * Verify that the output relocations offset meets the 675 * alignment requirements of the relocation being processed. 676 */ 677 rep = &reloc_table[orsp->rel_rtype]; 678 if (((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) && 679 !(rep->re_flags & FLG_RE_UNALIGN)) { 680 if (((rep->re_fsize == 2) && (roffset & 0x1)) || 681 ((rep->re_fsize == 4) && (roffset & 0x3)) || 682 ((rep->re_fsize == 8) && (roffset & 0x7))) { 683 Conv_inv_buf_t inv_buf; 684 685 eprintf(ofl->ofl_lml, ERR_FATAL, 686 MSG_INTL(MSG_REL_NONALIGN), 687 conv_reloc_SPARC_type(orsp->rel_rtype, 0, &inv_buf), 688 orsp->rel_isdesc->is_file->ifl_name, 689 demangle(orsp->rel_sname), EC_XWORD(roffset)); 690 return (S_ERROR); 691 } 692 } 693 694 /* 695 * Assign the symbols index for the output relocation. If the 696 * relocation refers to a SECTION symbol then it's index is based upon 697 * the output sections symbols index. Otherwise the index can be 698 * derived from the symbols index itself. 699 */ 700 if (orsp->rel_rtype == R_SPARC_RELATIVE) 701 ndx = STN_UNDEF; 702 else if ((orsp->rel_flags & FLG_REL_SCNNDX) || 703 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) { 704 if (sectmoved == 0) { 705 /* 706 * Check for a null input section. This can 707 * occur if this relocation references a symbol 708 * generated by sym_add_sym(). 709 */ 710 if ((sdp->sd_isc != 0) && 711 (sdp->sd_isc->is_osdesc != 0)) 712 ndx = sdp->sd_isc->is_osdesc->os_scnsymndx; 713 else 714 ndx = sdp->sd_shndx; 715 } else 716 ndx = ofl->ofl_parexpnndx; 717 } else 718 ndx = sdp->sd_symndx; 719 720 /* 721 * Add the symbols 'value' to the addend field. 722 */ 723 if (orsp->rel_flags & FLG_REL_ADVAL) 724 raddend += value; 725 726 /* 727 * The addend field for R_SPARC_TLS_DTPMOD32 and R_SPARC_TLS_DTPMOD64 728 * mean nothing. The addend is propagated in the corresponding 729 * R_SPARC_TLS_DTPOFF* relocations. 730 */ 731 if (orsp->rel_rtype == M_R_DTPMOD) 732 raddend = 0; 733 734 relbits = (char *)relosp->os_outdata->d_buf; 735 736 rea.r_info = ELF_R_INFO(ndx, ELF_R_TYPE_INFO(orsp->rel_typedata, 737 orsp->rel_rtype)); 738 rea.r_offset = roffset; 739 rea.r_addend = raddend; 740 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, relosp->os_name, 741 orsp->rel_sname)); 742 743 /* 744 * Assert we haven't walked off the end of our relocation table. 745 */ 746 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 747 748 (void) memcpy((relbits + relosp->os_szoutrels), 749 (char *)&rea, sizeof (Rela)); 750 relosp->os_szoutrels += (Xword)sizeof (Rela); 751 752 /* 753 * Determine if this relocation is against a non-writable, allocatable 754 * section. If so we may need to provide a text relocation diagnostic. 755 */ 756 ld_reloc_remain_entry(orsp, osp, ofl); 757 return (1); 758 } 759 760 761 /* 762 * Sparc Instructions for TLS processing 763 */ 764 #if defined(_ELF64) 765 #define TLS_GD_IE_LD 0xd0580000 /* ldx [%g0 + %g0], %o0 */ 766 #else 767 #define TLS_GD_IE_LD 0xd0000000 /* ld [%g0 + %g0], %o0 */ 768 #endif 769 #define TLS_GD_IE_ADD 0x9001c008 /* add %g7, %o0, %o0 */ 770 771 #define TLS_GD_LE_XOR 0x80182000 /* xor %g0, 0, %g0 */ 772 #define TLS_IE_LE_OR 0x80100000 /* or %g0, %o0, %o1 */ 773 /* synthetic: mov %g0, %g0 */ 774 775 #define TLS_LD_LE_CLRO0 0x90100000 /* clr %o0 */ 776 777 #define FM3_REG_MSK_RD (0x1f << 25) /* Formate (3) rd register mask */ 778 /* bits 25->29 */ 779 #define FM3_REG_MSK_RS1 (0x1f << 14) /* Formate (3) rs1 register mask */ 780 /* bits 14->18 */ 781 #define FM3_REG_MSK_RS2 0x1f /* Formate (3) rs2 register mask */ 782 /* bits 0->4 */ 783 784 #define REG_G7 7 /* %g7 register */ 785 786 static Fixupret 787 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp) 788 { 789 Sym_desc *sdp = arsp->rel_sym; 790 Word rtype = arsp->rel_rtype; 791 Word *offset, w; 792 int bswap = OFL_SWAP_RELOC_DATA(ofl, arsp); 793 794 795 offset = (Word *)((uintptr_t)arsp->rel_roffset + 796 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) + 797 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 798 799 if (sdp->sd_ref == REF_DYN_NEED) { 800 /* 801 * IE reference model 802 */ 803 switch (rtype) { 804 case R_SPARC_TLS_GD_HI22: 805 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 806 R_SPARC_TLS_IE_HI22, arsp)); 807 arsp->rel_rtype = R_SPARC_TLS_IE_HI22; 808 return (FIX_RELOC); 809 810 case R_SPARC_TLS_GD_LO10: 811 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 812 R_SPARC_TLS_IE_LO10, arsp)); 813 arsp->rel_rtype = R_SPARC_TLS_IE_LO10; 814 return (FIX_RELOC); 815 816 case R_SPARC_TLS_GD_ADD: 817 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 818 R_SPARC_NONE, arsp)); 819 w = bswap ? ld_bswap_Word(*offset) : *offset; 820 w = (TLS_GD_IE_LD | 821 (w & (FM3_REG_MSK_RS1 | FM3_REG_MSK_RS2))); 822 *offset = bswap ? ld_bswap_Word(w) : w; 823 return (FIX_DONE); 824 825 case R_SPARC_TLS_GD_CALL: 826 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 827 R_SPARC_NONE, arsp)); 828 *offset = TLS_GD_IE_ADD; 829 if (bswap) 830 *offset = ld_bswap_Word(*offset); 831 return (FIX_DONE); 832 } 833 return (FIX_RELOC); 834 } 835 836 /* 837 * LE reference model 838 */ 839 switch (rtype) { 840 case R_SPARC_TLS_IE_HI22: 841 case R_SPARC_TLS_GD_HI22: 842 case R_SPARC_TLS_LDO_HIX22: 843 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 844 R_SPARC_TLS_LE_HIX22, arsp)); 845 arsp->rel_rtype = R_SPARC_TLS_LE_HIX22; 846 return (FIX_RELOC); 847 848 case R_SPARC_TLS_LDO_LOX10: 849 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 850 R_SPARC_TLS_LE_LOX10, arsp)); 851 arsp->rel_rtype = R_SPARC_TLS_LE_LOX10; 852 return (FIX_RELOC); 853 854 case R_SPARC_TLS_IE_LO10: 855 case R_SPARC_TLS_GD_LO10: 856 /* 857 * Current instruction is: 858 * 859 * or r1, %lo(x), r2 860 * or 861 * add r1, %lo(x), r2 862 * 863 * 864 * Need to udpate this to: 865 * 866 * xor r1, %lox(x), r2 867 */ 868 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 869 R_SPARC_TLS_LE_LOX10, arsp)); 870 w = bswap ? ld_bswap_Word(*offset) : *offset; 871 w = TLS_GD_LE_XOR | 872 (w & (FM3_REG_MSK_RS1 | FM3_REG_MSK_RD)); 873 *offset = bswap ? ld_bswap_Word(w) : w; 874 arsp->rel_rtype = R_SPARC_TLS_LE_LOX10; 875 return (FIX_RELOC); 876 877 case R_SPARC_TLS_IE_LD: 878 case R_SPARC_TLS_IE_LDX: 879 /* 880 * Current instruction: 881 * ld{x} [r1 + r2], r3 882 * 883 * Need to update this to: 884 * 885 * mov r2, r3 (or %g0, r2, r3) 886 */ 887 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 888 R_SPARC_NONE, arsp)); 889 w = bswap ? ld_bswap_Word(*offset) : *offset; 890 w = (w & (FM3_REG_MSK_RS2 | FM3_REG_MSK_RD)) | TLS_IE_LE_OR; 891 *offset = bswap ? ld_bswap_Word(w) : w; 892 return (FIX_DONE); 893 894 case R_SPARC_TLS_LDO_ADD: 895 case R_SPARC_TLS_GD_ADD: 896 /* 897 * Current instruction is: 898 * 899 * add gptr_reg, r2, r3 900 * 901 * Need to updated this to: 902 * 903 * add %g7, r2, r3 904 */ 905 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 906 R_SPARC_NONE, arsp)); 907 w = bswap ? ld_bswap_Word(*offset) : *offset; 908 w = w & (~FM3_REG_MSK_RS1); 909 w = w | (REG_G7 << 14); 910 *offset = bswap ? ld_bswap_Word(w) : w; 911 return (FIX_DONE); 912 913 case R_SPARC_TLS_LDM_CALL: 914 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 915 R_SPARC_NONE, arsp)); 916 *offset = TLS_LD_LE_CLRO0; 917 if (bswap) 918 *offset = ld_bswap_Word(*offset); 919 return (FIX_DONE); 920 921 case R_SPARC_TLS_LDM_HI22: 922 case R_SPARC_TLS_LDM_LO10: 923 case R_SPARC_TLS_LDM_ADD: 924 case R_SPARC_TLS_IE_ADD: 925 case R_SPARC_TLS_GD_CALL: 926 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 927 R_SPARC_NONE, arsp)); 928 *offset = M_NOP; 929 if (bswap) 930 *offset = ld_bswap_Word(*offset); 931 return (FIX_DONE); 932 } 933 return (FIX_RELOC); 934 } 935 936 #define GOTOP_ADDINST 0x80000000 /* add %g0, %g0, %g0 */ 937 938 static Fixupret 939 gotop_fixups(Ofl_desc *ofl, Rel_desc *arsp) 940 { 941 Word rtype = arsp->rel_rtype; 942 Word *offset, w; 943 const char *ifl_name; 944 Conv_inv_buf_t inv_buf; 945 int bswap; 946 947 switch (rtype) { 948 case R_SPARC_GOTDATA_OP_HIX22: 949 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 950 R_SPARC_GOTDATA_HIX22, arsp)); 951 arsp->rel_rtype = R_SPARC_GOTDATA_HIX22; 952 return (FIX_RELOC); 953 954 case R_SPARC_GOTDATA_OP_LOX10: 955 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 956 R_SPARC_GOTDATA_LOX10, arsp)); 957 arsp->rel_rtype = R_SPARC_GOTDATA_LOX10; 958 return (FIX_RELOC); 959 960 case R_SPARC_GOTDATA_OP: 961 /* 962 * Current instruction: 963 * ld{x} [r1 + r2], r3 964 * 965 * Need to update this to: 966 * 967 * add r1, r2, r3 968 */ 969 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 970 R_SPARC_NONE, arsp)); 971 offset = (Word *)(uintptr_t)(arsp->rel_roffset + 972 _elf_getxoff(arsp->rel_isdesc->is_indata) + 973 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 974 bswap = OFL_SWAP_RELOC_DATA(ofl, arsp); 975 w = bswap ? ld_bswap_Word(*offset) : *offset; 976 w = (w & (FM3_REG_MSK_RS1 | 977 FM3_REG_MSK_RS2 | FM3_REG_MSK_RD)) | GOTOP_ADDINST; 978 *offset = bswap ? ld_bswap_Word(w) : w; 979 return (FIX_DONE); 980 } 981 /* 982 * We should not get here 983 */ 984 if (arsp->rel_isdesc->is_file) 985 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 986 else 987 ifl_name = MSG_INTL(MSG_STR_NULL); 988 989 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_BADGOTFIX), 990 conv_reloc_SPARC_type(arsp->rel_rtype, 0, &inv_buf), 991 ifl_name, demangle(arsp->rel_sname)); 992 993 assert(0); 994 return (FIX_ERROR); 995 } 996 997 static uintptr_t 998 ld_do_activerelocs(Ofl_desc *ofl) 999 { 1000 Rel_desc *arsp; 1001 Rel_cache *rcp; 1002 Listnode *lnp; 1003 uintptr_t return_code = 1; 1004 ofl_flag_t flags = ofl->ofl_flags; 1005 1006 if (ofl->ofl_actrels.head) 1007 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 1008 1009 /* 1010 * Process active relocations. 1011 */ 1012 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 1013 /* LINTED */ 1014 for (arsp = (Rel_desc *)(rcp + 1); 1015 arsp < rcp->rc_free; arsp++) { 1016 uchar_t *addr; 1017 Xword value; 1018 Sym_desc *sdp; 1019 const char *ifl_name; 1020 Xword refaddr; 1021 1022 /* 1023 * If the section this relocation is against has been 1024 * discarded (-zignore), then discard (skip) the 1025 * relocation itself. 1026 */ 1027 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 1028 ((arsp->rel_flags & 1029 (FLG_REL_GOT | FLG_REL_BSS | 1030 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 1031 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 1032 M_MACH, arsp)); 1033 continue; 1034 } 1035 1036 /* 1037 * Perform any required TLS fixups. 1038 */ 1039 if (arsp->rel_flags & FLG_REL_TLSFIX) { 1040 Fixupret ret; 1041 1042 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 1043 return (S_ERROR); 1044 if (ret == FIX_DONE) 1045 continue; 1046 } 1047 1048 /* 1049 * Perform any required GOTOP fixups. 1050 */ 1051 if (arsp->rel_flags & FLG_REL_GOTFIX) { 1052 Fixupret ret; 1053 1054 if ((ret = 1055 gotop_fixups(ofl, arsp)) == FIX_ERROR) 1056 return (S_ERROR); 1057 if (ret == FIX_DONE) 1058 continue; 1059 } 1060 1061 /* 1062 * If this is a relocation against the move table, or 1063 * expanded move table, adjust the relocation entries. 1064 */ 1065 if (arsp->rel_move) 1066 ld_adj_movereloc(ofl, arsp); 1067 1068 sdp = arsp->rel_sym; 1069 refaddr = arsp->rel_roffset + 1070 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 1071 1072 if ((arsp->rel_flags & FLG_REL_CLVAL) || 1073 (arsp->rel_flags & FLG_REL_GOTCL)) 1074 value = 0; 1075 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 1076 STT_SECTION) { 1077 Sym_desc *sym; 1078 1079 /* 1080 * The value for a symbol pointing to a SECTION 1081 * is based off of that sections position. 1082 */ 1083 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 1084 (sym = ld_am_I_partial(arsp, 1085 arsp->rel_raddend))) { 1086 /* 1087 * The symbol was moved, so adjust 1088 * the value relative to the new 1089 * section. 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 1098 /* 1099 * The original raddend covers the 1100 * displacement from the section start 1101 * to the desired address. The value 1102 * computed above gets us from the 1103 * section start to the start of the 1104 * symbol range. Adjust the old raddend 1105 * to remove the offset from section 1106 * start to symbol start, leaving the 1107 * displacement within the range of 1108 * the symbol. 1109 */ 1110 arsp->rel_raddend -= 1111 sym->sd_osym->st_value; 1112 } else { 1113 value = _elf_getxoff( 1114 sdp->sd_isc->is_indata); 1115 if (sdp->sd_isc->is_shdr->sh_flags & 1116 SHF_ALLOC) 1117 value += sdp->sd_isc-> 1118 is_osdesc->os_shdr->sh_addr; 1119 } 1120 1121 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 1122 value -= ofl->ofl_tlsphdr->p_vaddr; 1123 1124 } else if (IS_SIZE(arsp->rel_rtype)) { 1125 /* 1126 * Size relocations require the symbols size. 1127 */ 1128 value = sdp->sd_sym->st_size; 1129 } else { 1130 /* 1131 * Else the value is the symbols value. 1132 */ 1133 value = sdp->sd_sym->st_value; 1134 } 1135 1136 /* 1137 * Relocation against the GLOBAL_OFFSET_TABLE. 1138 */ 1139 if (arsp->rel_flags & FLG_REL_GOT) 1140 arsp->rel_osdesc = ofl->ofl_osgot; 1141 1142 /* 1143 * If loadable and not producing a relocatable object 1144 * add the sections virtual address to the reference 1145 * address. 1146 */ 1147 if ((arsp->rel_flags & FLG_REL_LOAD) && 1148 ((flags & FLG_OF_RELOBJ) == 0)) 1149 refaddr += arsp->rel_isdesc->is_osdesc-> 1150 os_shdr->sh_addr; 1151 1152 /* 1153 * If this entry has a PLT assigned to it, it's 1154 * value is actually the address of the PLT (and 1155 * not the address of the function). 1156 */ 1157 if (IS_PLT(arsp->rel_rtype)) { 1158 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 1159 value = ld_calc_plt_addr(sdp, ofl); 1160 } 1161 1162 /* 1163 * Add relocations addend to value. Add extra 1164 * relocation addend if needed. 1165 */ 1166 value += arsp->rel_raddend; 1167 if (IS_EXTOFFSET(arsp->rel_rtype)) 1168 value += arsp->rel_typedata; 1169 1170 /* 1171 * Determine whether the value needs further adjustment. 1172 * Filter through the attributes of the relocation to 1173 * determine what adjustment is required. Note, many 1174 * of the following cases are only applicable when a 1175 * .got is present. As a .got is not generated when a 1176 * relocatable object is being built, any adjustments 1177 * that require a .got need to be skipped. 1178 */ 1179 if ((arsp->rel_flags & FLG_REL_GOT) && 1180 ((flags & FLG_OF_RELOBJ) == 0)) { 1181 Xword R1addr; 1182 uintptr_t R2addr; 1183 Sword gotndx; 1184 Gotndx *gnp; 1185 Gotref gref; 1186 1187 /* 1188 * Clear the GOT table entry, on SPARC we clear 1189 * the entry and the 'value' if needed is stored 1190 * in an output relocations addend. 1191 * 1192 * Calculate offset into GOT at which to apply 1193 * the relocation. 1194 */ 1195 if (arsp->rel_flags & FLG_REL_DTLS) 1196 gref = GOT_REF_TLSGD; 1197 else if (arsp->rel_flags & FLG_REL_MTLS) 1198 gref = GOT_REF_TLSLD; 1199 else if (arsp->rel_flags & FLG_REL_STLS) 1200 gref = GOT_REF_TLSIE; 1201 else 1202 gref = GOT_REF_GENERIC; 1203 1204 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 1205 ofl, arsp); 1206 assert(gnp); 1207 1208 if (arsp->rel_rtype == M_R_DTPOFF) 1209 gotndx = gnp->gn_gotndx + 1; 1210 else 1211 gotndx = gnp->gn_gotndx; 1212 1213 /* LINTED */ 1214 R1addr = (Xword)((-neggotoffset * 1215 M_GOT_ENTSIZE) + (gotndx * M_GOT_ENTSIZE)); 1216 1217 /* 1218 * Add the GOTs data's offset. 1219 */ 1220 R2addr = R1addr + (uintptr_t) 1221 arsp->rel_osdesc->os_outdata->d_buf; 1222 1223 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 1224 ELF_DBG_LD, M_MACH, SHT_RELA, 1225 arsp->rel_rtype, R1addr, value, 1226 arsp->rel_sname, arsp->rel_osdesc)); 1227 1228 /* 1229 * And do it. 1230 */ 1231 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 1232 *(Xword *)R2addr = 1233 ld_bswap_Xword(value); 1234 else 1235 *(Xword *)R2addr = value; 1236 continue; 1237 1238 } else if (IS_GOT_BASED(arsp->rel_rtype) && 1239 ((flags & FLG_OF_RELOBJ) == 0)) { 1240 value -= (ofl->ofl_osgot->os_shdr->sh_addr + 1241 (-neggotoffset * M_GOT_ENTSIZE)); 1242 1243 } else if (IS_PC_RELATIVE(arsp->rel_rtype)) { 1244 value -= refaddr; 1245 1246 } else if (IS_TLS_INS(arsp->rel_rtype) && 1247 IS_GOT_RELATIVE(arsp->rel_rtype) && 1248 ((flags & FLG_OF_RELOBJ) == 0)) { 1249 Gotndx *gnp; 1250 Gotref gref; 1251 1252 if (arsp->rel_flags & FLG_REL_STLS) 1253 gref = GOT_REF_TLSIE; 1254 else if (arsp->rel_flags & FLG_REL_DTLS) 1255 gref = GOT_REF_TLSGD; 1256 else if (arsp->rel_flags & FLG_REL_MTLS) 1257 gref = GOT_REF_TLSLD; 1258 1259 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 1260 ofl, arsp); 1261 assert(gnp); 1262 1263 value = gnp->gn_gotndx * M_GOT_ENTSIZE; 1264 1265 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 1266 ((flags & FLG_OF_RELOBJ) == 0)) { 1267 Gotndx *gnp; 1268 1269 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1270 GOT_REF_GENERIC, ofl, arsp); 1271 assert(gnp); 1272 1273 value = gnp->gn_gotndx * M_GOT_ENTSIZE; 1274 1275 } else if ((arsp->rel_flags & FLG_REL_STLS) && 1276 ((flags & FLG_OF_RELOBJ) == 0)) { 1277 Xword tlsstatsize; 1278 1279 /* 1280 * This is the LE TLS 1281 * reference model. Static offset 1282 * is hard-coded, and negated so that 1283 * it can be added to the thread pointer (%g7) 1284 */ 1285 tlsstatsize = S_ROUND(ofl-> 1286 ofl_tlsphdr->p_memsz, M_TLSSTATALIGN); 1287 value = -(tlsstatsize - value); 1288 } 1289 1290 if (arsp->rel_isdesc->is_file) 1291 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 1292 else 1293 ifl_name = MSG_INTL(MSG_STR_NULL); 1294 1295 /* 1296 * Make sure we have data to relocate. Compiler and 1297 * assembler developers have been known to generate 1298 * relocations against invalid sections (normally .bss), 1299 * so for their benefit give them sufficient information 1300 * to help analyze the problem. End users should never 1301 * see this. 1302 */ 1303 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 1304 Conv_inv_buf_t inv_buf; 1305 1306 eprintf(ofl->ofl_lml, ERR_FATAL, 1307 MSG_INTL(MSG_REL_EMPTYSEC), 1308 conv_reloc_SPARC_type(arsp->rel_rtype, 1309 0, &inv_buf), ifl_name, 1310 demangle(arsp->rel_sname), 1311 arsp->rel_isdesc->is_name); 1312 return (S_ERROR); 1313 } 1314 1315 /* 1316 * Get the address of the data item we need to modify. 1317 */ 1318 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 1319 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 1320 is_indata)); 1321 1322 /*LINTED*/ 1323 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 1324 M_MACH, SHT_RELA, arsp->rel_rtype, EC_NATPTR(addr), 1325 value, arsp->rel_sname, arsp->rel_osdesc)); 1326 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 1327 1328 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 1329 ofl->ofl_size) || (arsp->rel_roffset > 1330 arsp->rel_osdesc->os_shdr->sh_size)) { 1331 Conv_inv_buf_t inv_buf; 1332 int class; 1333 1334 if (((uintptr_t)addr - 1335 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 1336 class = ERR_FATAL; 1337 else 1338 class = ERR_WARNING; 1339 1340 eprintf(ofl->ofl_lml, class, 1341 MSG_INTL(MSG_REL_INVALOFFSET), 1342 conv_reloc_SPARC_type(arsp->rel_rtype, 1343 0, &inv_buf), ifl_name, 1344 arsp->rel_isdesc->is_name, 1345 demangle(arsp->rel_sname), 1346 EC_ADDR((uintptr_t)addr - 1347 (uintptr_t)ofl->ofl_nehdr)); 1348 1349 if (class == ERR_FATAL) { 1350 return_code = S_ERROR; 1351 continue; 1352 } 1353 } 1354 1355 /* 1356 * If '-z noreloc' is specified - skip the do_reloc 1357 * stage. 1358 */ 1359 if (OFL_DO_RELOC(ofl)) { 1360 if (do_reloc_ld((uchar_t)arsp->rel_rtype, addr, 1361 &value, arsp->rel_sname, ifl_name, 1362 OFL_SWAP_RELOC_DATA(ofl, arsp), 1363 ofl->ofl_lml) == 0) 1364 return_code = S_ERROR; 1365 } 1366 } 1367 } 1368 return (return_code); 1369 } 1370 1371 static uintptr_t 1372 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1373 { 1374 Rel_desc *orsp; 1375 Rel_cache *rcp; 1376 Sym_desc *sdp = rsp->rel_sym; 1377 Conv_inv_buf_t inv_buf; 1378 1379 /* 1380 * Static executables *do not* want any relocations against them. 1381 * Since our engine still creates relocations against a WEAK UNDEFINED 1382 * symbol in a static executable, it's best to disable them here 1383 * instead of through out the relocation code. 1384 */ 1385 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 1386 (FLG_OF_STATIC | FLG_OF_EXEC)) 1387 return (1); 1388 1389 /* 1390 * Certain relocations do not make sense in a 64bit shared object, 1391 * if building a shared object do a sanity check on the output 1392 * relocations being created. 1393 */ 1394 if (ofl->ofl_flags & FLG_OF_SHAROBJ) { 1395 Word rtype = rsp->rel_rtype; 1396 /* 1397 * Because the R_SPARC_HIPLT22 & R_SPARC_LOPLT10 relocations 1398 * are not relative they make no sense to create in a shared 1399 * object - so emit the proper error message if that occurs. 1400 */ 1401 if ((rtype == R_SPARC_HIPLT22) || (rtype == R_SPARC_LOPLT10)) { 1402 eprintf(ofl->ofl_lml, ERR_FATAL, 1403 MSG_INTL(MSG_REL_UNRELREL), 1404 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1405 rsp->rel_isdesc->is_file->ifl_name, 1406 demangle(rsp->rel_sname)); 1407 return (S_ERROR); 1408 } 1409 #if defined(_ELF64) 1410 /* 1411 * Each of the following relocations requires that the 1412 * object being built be loaded in either the upper 32 or 1413 * 44 bit range of memory. Since shared libraries traditionally 1414 * are loaded in the lower range of memory - this isn't going 1415 * to work. 1416 */ 1417 if ((rtype == R_SPARC_H44) || (rtype == R_SPARC_M44) || 1418 (rtype == R_SPARC_L44)) { 1419 eprintf(ofl->ofl_lml, ERR_FATAL, 1420 MSG_INTL(MSG_REL_SHOBJABS44), 1421 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1422 rsp->rel_isdesc->is_file->ifl_name, 1423 demangle(rsp->rel_sname)); 1424 return (S_ERROR); 1425 } 1426 #endif 1427 } 1428 1429 /* 1430 * If no relocation cache structures are available allocate 1431 * a new one and link it into the cache list. 1432 */ 1433 if ((ofl->ofl_outrels.tail == 0) || 1434 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1435 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1436 static size_t nextsize = 0; 1437 size_t size; 1438 1439 /* 1440 * Output relocation numbers can vary considerably between 1441 * building executables or shared objects (pic vs. non-pic), 1442 * etc. But, they typically aren't very large, so for these 1443 * objects use a standard bucket size. For building relocatable 1444 * objects, typically there will be an output relocation for 1445 * every input relocation. 1446 */ 1447 if (nextsize == 0) { 1448 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1449 if ((size = ofl->ofl_relocincnt) == 0) 1450 size = REL_LOIDESCNO; 1451 if (size > REL_HOIDESCNO) 1452 nextsize = REL_HOIDESCNO; 1453 else 1454 nextsize = REL_LOIDESCNO; 1455 } else 1456 nextsize = size = REL_HOIDESCNO; 1457 } else 1458 size = nextsize; 1459 1460 size = size * sizeof (Rel_desc); 1461 1462 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1463 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1464 return (S_ERROR); 1465 1466 /* LINTED */ 1467 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1468 /* LINTED */ 1469 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1470 } 1471 1472 1473 /* 1474 * If we are adding a output relocation against a section 1475 * symbol (non-RELATIVE) then mark that section. These sections 1476 * will be added to the .dynsym symbol table. 1477 */ 1478 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1479 ((flags & FLG_REL_SCNNDX) || 1480 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1481 1482 /* 1483 * If this is a COMMON symbol - no output section 1484 * exists yet - (it's created as part of sym_validate()). 1485 * So - we mark here that when it's created it should 1486 * be tagged with the FLG_OS_OUTREL flag. 1487 */ 1488 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1489 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1490 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1491 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1492 else 1493 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1494 } else { 1495 Os_desc *osp = sdp->sd_isc->is_osdesc; 1496 1497 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1498 ofl->ofl_dynshdrcnt++; 1499 osp->os_flags |= FLG_OS_OUTREL; 1500 } 1501 } 1502 } 1503 1504 *orsp = *rsp; 1505 orsp->rel_flags |= flags; 1506 1507 rcp->rc_free++; 1508 ofl->ofl_outrelscnt++; 1509 1510 if (flags & FLG_REL_GOT) 1511 ofl->ofl_relocgotsz += (Xword)sizeof (Rela); 1512 else if (flags & FLG_REL_PLT) 1513 ofl->ofl_relocpltsz += (Xword)sizeof (Rela); 1514 else if (flags & FLG_REL_BSS) 1515 ofl->ofl_relocbsssz += (Xword)sizeof (Rela); 1516 else if (flags & FLG_REL_NOINFO) 1517 ofl->ofl_relocrelsz += (Xword)sizeof (Rela); 1518 else 1519 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rela); 1520 1521 if (orsp->rel_rtype == M_R_RELATIVE) 1522 ofl->ofl_relocrelcnt++; 1523 1524 #if defined(_ELF64) 1525 /* 1526 * When building a 64-bit object any R_SPARC_WDISP30 relocation is given 1527 * a plt padding entry, unless we're building a relocatable object 1528 * (ld -r) or -b is in effect. 1529 */ 1530 if ((orsp->rel_rtype == R_SPARC_WDISP30) && 1531 ((ofl->ofl_flags & (FLG_OF_BFLAG | FLG_OF_RELOBJ)) == 0) && 1532 ((orsp->rel_sym->sd_flags & FLG_SY_PLTPAD) == 0)) { 1533 ofl->ofl_pltpad++; 1534 orsp->rel_sym->sd_flags |= FLG_SY_PLTPAD; 1535 } 1536 #endif 1537 /* 1538 * We don't perform sorting on PLT relocations because 1539 * they have already been assigned a PLT index and if we 1540 * were to sort them we would have to re-assign the plt indexes. 1541 */ 1542 if (!(flags & FLG_REL_PLT)) 1543 ofl->ofl_reloccnt++; 1544 1545 /* 1546 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1547 */ 1548 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1549 ofl->ofl_flags |= FLG_OF_BLDGOT; 1550 1551 /* 1552 * Identify and possibly warn of a displacement relocation. 1553 */ 1554 if (orsp->rel_flags & FLG_REL_DISP) { 1555 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1556 1557 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1558 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1559 } 1560 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_RELA, 1561 M_MACH, orsp)); 1562 return (1); 1563 } 1564 1565 /* 1566 * Process relocation against a register symbol. Note, of -z muldefs is in 1567 * effect there may have been multiple register definitions, which would have 1568 * been processed as non-fatal, with the first definition winning. But, we 1569 * will also process multiple relocations for these multiple definitions. In 1570 * this case we must only preserve the relocation for the definition that was 1571 * kept. The sad part is that register relocations don't typically specify 1572 * the register symbol with which they are associated, so we might have to 1573 * search the input files global symbols to determine if this relocation is 1574 * appropriate. 1575 */ 1576 static uintptr_t 1577 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1578 { 1579 if (ofl->ofl_flags & FLG_OF_MULDEFS) { 1580 Ifl_desc * ifl = isp->is_file; 1581 Sym_desc * sdp = rsp->rel_sym; 1582 1583 if (sdp == 0) { 1584 Xword offset = rsp->rel_roffset; 1585 Word ndx; 1586 1587 for (ndx = ifl->ifl_locscnt; 1588 ndx < ifl->ifl_symscnt; ndx++) { 1589 if (((sdp = ifl->ifl_oldndx[ndx]) != 0) && 1590 (sdp->sd_flags & FLG_SY_REGSYM) && 1591 (sdp->sd_sym->st_value == offset)) 1592 break; 1593 } 1594 } 1595 if (sdp && (sdp->sd_file != ifl)) 1596 return (1); 1597 } 1598 return (ld_add_outrel((rsp->rel_flags | FLG_REL_REG), rsp, ofl)); 1599 } 1600 1601 /* 1602 * process relocation for a LOCAL symbol 1603 */ 1604 static uintptr_t 1605 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1606 { 1607 ofl_flag_t flags = ofl->ofl_flags; 1608 Sym_desc *sdp = rsp->rel_sym; 1609 Word shndx = sdp->sd_sym->st_shndx; 1610 1611 /* 1612 * if ((shared object) and (not pc relative relocation) and 1613 * (not against ABS symbol)) 1614 * then 1615 * if (rtype != R_SPARC_32) 1616 * then 1617 * build relocation against section 1618 * else 1619 * build R_SPARC_RELATIVE 1620 * fi 1621 * fi 1622 */ 1623 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1624 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1625 !(IS_GOT_BASED(rsp->rel_rtype)) && 1626 !(rsp->rel_isdesc != NULL && 1627 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1628 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1629 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1630 Word ortype = rsp->rel_rtype; 1631 1632 if ((rsp->rel_rtype != R_SPARC_32) && 1633 (rsp->rel_rtype != R_SPARC_PLT32) && 1634 (rsp->rel_rtype != R_SPARC_64)) 1635 return (ld_add_outrel((FLG_REL_SCNNDX | FLG_REL_ADVAL), 1636 rsp, ofl)); 1637 1638 rsp->rel_rtype = R_SPARC_RELATIVE; 1639 if (ld_add_outrel(FLG_REL_ADVAL, rsp, ofl) == S_ERROR) 1640 return (S_ERROR); 1641 rsp->rel_rtype = ortype; 1642 return (1); 1643 } 1644 1645 /* 1646 * If the relocation is against a 'non-allocatable' section 1647 * and we can not resolve it now - then give a warning 1648 * message. 1649 * 1650 * We can not resolve the symbol if either: 1651 * a) it's undefined 1652 * b) it's defined in a shared library and a 1653 * COPY relocation hasn't moved it to the executable 1654 * 1655 * Note: because we process all of the relocations against the 1656 * text segment before any others - we know whether 1657 * or not a copy relocation will be generated before 1658 * we get here (see reloc_init()->reloc_segments()). 1659 */ 1660 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1661 ((shndx == SHN_UNDEF) || 1662 ((sdp->sd_ref == REF_DYN_NEED) && 1663 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1664 Conv_inv_buf_t inv_buf; 1665 1666 /* 1667 * If the relocation is against a SHT_SUNW_ANNOTATE 1668 * section - then silently ignore that the relocation 1669 * can not be resolved. 1670 */ 1671 if (rsp->rel_osdesc && 1672 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1673 return (0); 1674 (void) eprintf(ofl->ofl_lml, ERR_WARNING, 1675 MSG_INTL(MSG_REL_EXTERNSYM), 1676 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1677 rsp->rel_isdesc->is_file->ifl_name, 1678 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1679 return (1); 1680 } 1681 1682 /* 1683 * Perform relocation. 1684 */ 1685 return (ld_add_actrel(NULL, rsp, ofl)); 1686 } 1687 1688 /* 1689 * Establish a relocation transition. Note, at this point of input relocation 1690 * processing, we have no idea of the relocation value that will be used in 1691 * the eventual relocation calculation. This value is only known after the 1692 * initial image has been constructed. Therefore, there is a small chance 1693 * that a value can exceed the capabilities of the transitioned relocation. 1694 * One example might be the offset from the GOT to a symbol. 1695 * 1696 * The only instance of this failure discovered so far has been via the use of 1697 * ABS symbols to represent an external memory location. This situation is 1698 * rare, since ABS symbols aren't typically generated by the compilers. 1699 * Therefore, our solution is to excluded ABS symbols from the transition 1700 * relocation possibilities. As an additional safeguard, if an inappropriate 1701 * value is passed to the final relocation engine, a verification ("V") 1702 * relocation should trigger a fatal error condition. 1703 */ 1704 static uintptr_t 1705 ld_reloc_GOTOP(Boolean local, Rel_desc *rsp, Ofl_desc *ofl) 1706 { 1707 Word rtype = rsp->rel_rtype; 1708 1709 if (!local || (rsp->rel_sym->sd_sym->st_shndx == SHN_ABS)) { 1710 /* 1711 * When binding to a external symbol, no fixups are required 1712 * and the GOTDATA_OP relocation can be ignored. 1713 */ 1714 if (rtype == R_SPARC_GOTDATA_OP) 1715 return (1); 1716 return (ld_reloc_GOT_relative(local, rsp, ofl)); 1717 } 1718 1719 /* 1720 * When binding to a local symbol the relocations can be transitioned: 1721 * 1722 * R_*_GOTDATA_OP_HIX22 -> R_*_GOTDATA_HIX22 1723 * R_*_GOTDATA_OP_LOX10 -> R_*_GOTDATA_LOX10 1724 * R_*_GOTDATA_OP -> instruction fixup 1725 */ 1726 return (ld_add_actrel(FLG_REL_GOTFIX, rsp, ofl)); 1727 } 1728 1729 static uintptr_t 1730 ld_reloc_TLS(Boolean local, Rel_desc *rsp, Ofl_desc *ofl) 1731 { 1732 Word rtype = rsp->rel_rtype; 1733 Sym_desc *sdp = rsp->rel_sym; 1734 ofl_flag_t flags = ofl->ofl_flags; 1735 Gotndx *gnp; 1736 1737 /* 1738 * If we're building an executable - use either the IE or LE access 1739 * model. If we're building a shared object process any IE model. 1740 */ 1741 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1742 /* 1743 * Set the DF_STATIC_TLS flag. 1744 */ 1745 ofl->ofl_dtflags |= DF_STATIC_TLS; 1746 1747 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1748 /* 1749 * When processing static TLS - these relocations 1750 * can be ignored. 1751 */ 1752 if ((rtype == R_SPARC_TLS_IE_LD) || 1753 (rtype == R_SPARC_TLS_IE_LDX) || 1754 (rtype == R_SPARC_TLS_IE_ADD)) 1755 return (1); 1756 1757 /* 1758 * Assign a GOT entry for IE static TLS references. 1759 */ 1760 if (((rtype == R_SPARC_TLS_GD_HI22) || 1761 (rtype == R_SPARC_TLS_GD_LO10) || 1762 (rtype == R_SPARC_TLS_IE_HI22) || 1763 (rtype == R_SPARC_TLS_IE_LO10)) && 1764 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1765 GOT_REF_TLSIE, ofl, rsp)) == 0)) { 1766 1767 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1768 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1769 rtype, M_R_TPOFF, 0) == S_ERROR) 1770 return (S_ERROR); 1771 } 1772 1773 /* 1774 * IE access model. 1775 */ 1776 if (IS_TLS_IE(rtype)) 1777 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1778 1779 /* 1780 * Fixups are required for other executable models. 1781 */ 1782 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1783 rsp, ofl)); 1784 } 1785 1786 /* 1787 * LE access model. 1788 */ 1789 if (IS_TLS_LE(rtype)) 1790 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1791 1792 /* 1793 * When processing static TLS - these relocations can be 1794 * ignored. 1795 */ 1796 if (rtype == R_SPARC_TLS_IE_ADD) 1797 return (1); 1798 1799 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1800 rsp, ofl)); 1801 } 1802 1803 /* 1804 * Building a shared object. 1805 * 1806 * For dynamic TLS references, ADD relocations are ignored. 1807 */ 1808 if ((rtype == R_SPARC_TLS_GD_ADD) || (rtype == R_SPARC_TLS_LDM_ADD) || 1809 (rtype == R_SPARC_TLS_LDO_ADD)) 1810 return (1); 1811 1812 /* 1813 * Assign a GOT entry for a dynamic TLS reference. 1814 */ 1815 if (((rtype == R_SPARC_TLS_LDM_HI22) || 1816 (rtype == R_SPARC_TLS_LDM_LO10)) && 1817 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSLD, 1818 ofl, rsp)) == 0)) { 1819 1820 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1821 FLG_REL_MTLS, rtype, M_R_DTPMOD, 0) == S_ERROR) 1822 return (S_ERROR); 1823 1824 } else if (((rtype == R_SPARC_TLS_GD_HI22) || 1825 (rtype == R_SPARC_TLS_GD_LO10)) && 1826 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1827 ofl, rsp)) == 0)) { 1828 1829 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1830 FLG_REL_DTLS, rtype, M_R_DTPMOD, M_R_DTPOFF) == S_ERROR) 1831 return (S_ERROR); 1832 } 1833 1834 /* 1835 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1836 * cause a call to __tls_get_addr(). Convert this relocation to that 1837 * symbol now, and prepare for the PLT magic. 1838 */ 1839 if ((rtype == R_SPARC_TLS_GD_CALL) || (rtype == R_SPARC_TLS_LDM_CALL)) { 1840 Sym_desc *tlsgetsym; 1841 1842 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_U), 1843 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1844 return (S_ERROR); 1845 1846 rsp->rel_sym = tlsgetsym; 1847 rsp->rel_sname = tlsgetsym->sd_name; 1848 rsp->rel_rtype = R_SPARC_WPLT30; 1849 1850 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1851 return (S_ERROR); 1852 1853 rsp->rel_sym = sdp; 1854 rsp->rel_sname = sdp->sd_name; 1855 rsp->rel_rtype = rtype; 1856 return (1); 1857 } 1858 1859 if (IS_TLS_LD(rtype)) 1860 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1861 1862 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1863 } 1864 1865 /* 1866 * ld_allocate_got: if a GOT is to be made, after the section is built this 1867 * function is called to allocate all the GOT slots. The allocation is 1868 * deferred until after all GOTs have been counted and sorted according 1869 * to their size, for only then will we know how to allocate them on 1870 * a processor like SPARC which has different models for addressing the 1871 * GOT. SPARC has two: small and large, small uses a signed 13-bit offset 1872 * into the GOT, whereas large uses an unsigned 32-bit offset. 1873 */ 1874 static Sword small_index; /* starting index for small GOT entries */ 1875 static Sword mixed_index; /* starting index for mixed GOT entries */ 1876 static Sword large_index; /* starting index for large GOT entries */ 1877 1878 static uintptr_t 1879 ld_assign_got(Ofl_desc *ofl, Sym_desc * sdp) 1880 { 1881 Listnode * lnp; 1882 Gotndx * gnp; 1883 1884 for (LIST_TRAVERSE(&sdp->sd_GOTndxs, lnp, gnp)) { 1885 uint_t gotents; 1886 Gotref gref; 1887 gref = gnp->gn_gotref; 1888 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1889 gotents = 2; 1890 else 1891 gotents = 1; 1892 1893 switch (gnp->gn_gotndx) { 1894 case M_GOT_SMALL: 1895 gnp->gn_gotndx = small_index; 1896 small_index += gotents; 1897 if (small_index == 0) 1898 small_index = M_GOT_XNumber; 1899 break; 1900 case M_GOT_MIXED: 1901 gnp->gn_gotndx = mixed_index; 1902 mixed_index += gotents; 1903 break; 1904 case M_GOT_LARGE: 1905 gnp->gn_gotndx = large_index; 1906 large_index += gotents; 1907 break; 1908 default: 1909 eprintf(ofl->ofl_lml, ERR_FATAL, 1910 MSG_INTL(MSG_REL_ASSIGNGOT), 1911 EC_XWORD(gnp->gn_gotndx), demangle(sdp->sd_name)); 1912 return (S_ERROR); 1913 } 1914 } 1915 return (1); 1916 } 1917 1918 /* 1919 * Search the GOT index list for a GOT entry with the proper addend. 1920 */ 1921 static Gotndx * 1922 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1923 { 1924 Listnode * lnp; 1925 Gotndx * gnp; 1926 1927 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1928 return (ofl->ofl_tlsldgotndx); 1929 1930 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1931 if ((rdesc->rel_raddend == gnp->gn_addend) && 1932 (gref == gnp->gn_gotref)) 1933 return (gnp); 1934 } 1935 return ((Gotndx *)0); 1936 } 1937 1938 static Xword 1939 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1940 { 1941 Os_desc *osp = ofl->ofl_osgot; 1942 Sym_desc *sdp = rdesc->rel_sym; 1943 Xword gotndx; 1944 Gotref gref; 1945 Gotndx *gnp; 1946 1947 if (rdesc->rel_flags & FLG_REL_DTLS) 1948 gref = GOT_REF_TLSGD; 1949 else if (rdesc->rel_flags & FLG_REL_MTLS) 1950 gref = GOT_REF_TLSLD; 1951 else if (rdesc->rel_flags & FLG_REL_STLS) 1952 gref = GOT_REF_TLSIE; 1953 else 1954 gref = GOT_REF_GENERIC; 1955 1956 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, rdesc); 1957 assert(gnp); 1958 1959 gotndx = (Xword)gnp->gn_gotndx; 1960 1961 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1962 (rdesc->rel_rtype == M_R_DTPOFF)) 1963 gotndx++; 1964 1965 return ((Xword)((osp->os_shdr->sh_addr) + (gotndx * M_GOT_ENTSIZE) + 1966 (-neggotoffset * M_GOT_ENTSIZE))); 1967 } 1968 1969 static uintptr_t 1970 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1971 Rel_desc * rsp, Sym_desc * sdp) 1972 { 1973 Xword raddend; 1974 Gotndx * gnp, * _gnp; 1975 Listnode * lnp, * plnp; 1976 uint_t gotents; 1977 1978 /* Some TLS requires two relocations with two GOT entries */ 1979 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1980 gotents = 2; 1981 else 1982 gotents = 1; 1983 1984 raddend = rsp->rel_raddend; 1985 if (pgnp && (pgnp->gn_addend == raddend) && (pgnp->gn_gotref == gref)) { 1986 1987 /* 1988 * If an entry for this addend already exists, determine if it 1989 * has mixed mode GOT access (both PIC and pic). 1990 * 1991 * In order to be accessible by both large and small pic, 1992 * a mixed mode GOT must be located in the positive index 1993 * range above _GLOBAL_OFFSET_TABLE_, and in the range 1994 * reachable small pic. This is necessary because the large 1995 * PIC mode cannot use a negative offset. This implies that 1996 * there can be no more than (M_GOT_MAXSMALL/2 - M_GOT_XNumber) 1997 * such entries. 1998 */ 1999 switch (pgnp->gn_gotndx) { 2000 case M_GOT_SMALL: 2001 /* 2002 * This one was previously identified as a small 2003 * GOT. If this access is large, then convert 2004 * it to mixed. 2005 */ 2006 if (rsp->rel_rtype != R_SPARC_GOT13) { 2007 pgnp->gn_gotndx = M_GOT_MIXED; 2008 mixgotcnt += gotents; 2009 } 2010 break; 2011 2012 case M_GOT_LARGE: 2013 /* 2014 * This one was previously identified as a large 2015 * GOT. If this access is small, convert it to mixed. 2016 */ 2017 if (rsp->rel_rtype == R_SPARC_GOT13) { 2018 smlgotcnt += gotents; 2019 mixgotcnt += gotents; 2020 pgnp->gn_gotndx = M_GOT_MIXED; 2021 sdp->sd_flags |= FLG_SY_SMGOT; 2022 } 2023 break; 2024 } 2025 return (1); 2026 } 2027 2028 plnp = 0; 2029 for (LIST_TRAVERSE(lst, lnp, _gnp)) { 2030 if (_gnp->gn_addend > raddend) 2031 break; 2032 plnp = lnp; 2033 } 2034 2035 /* 2036 * Allocate a new entry. 2037 */ 2038 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 2039 return (S_ERROR); 2040 gnp->gn_addend = raddend; 2041 gnp->gn_gotref = gref; 2042 ofl->ofl_gotcnt += gotents; 2043 2044 if (rsp->rel_rtype == R_SPARC_GOT13) { 2045 gnp->gn_gotndx = M_GOT_SMALL; 2046 smlgotcnt += gotents; 2047 sdp->sd_flags |= FLG_SY_SMGOT; 2048 } else { 2049 gnp->gn_gotndx = M_GOT_LARGE; 2050 } 2051 2052 if (gref == GOT_REF_TLSLD) { 2053 ofl->ofl_tlsldgotndx = gnp; 2054 return (1); 2055 } 2056 2057 if (plnp == 0) { 2058 /* 2059 * Insert at head of list 2060 */ 2061 if (list_prependc(lst, (void *)gnp) == 0) 2062 return (S_ERROR); 2063 } else if (_gnp->gn_addend > raddend) { 2064 /* 2065 * Insert in middle of lest 2066 */ 2067 if (list_insertc(lst, (void *)gnp, plnp) == 0) 2068 return (S_ERROR); 2069 } else { 2070 /* 2071 * Append to tail of list 2072 */ 2073 if (list_appendc(lst, (void *)gnp) == 0) 2074 return (S_ERROR); 2075 } 2076 return (1); 2077 } 2078 2079 static void 2080 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 2081 { 2082 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 2083 } 2084 2085 2086 static uintptr_t 2087 ld_allocate_got(Ofl_desc * ofl) 2088 { 2089 const Sword first_large_ndx = M_GOT_MAXSMALL / 2; 2090 Sym_desc * sdp; 2091 Addr addr; 2092 2093 /* 2094 * Sanity check -- is this going to fit at all? There are two 2095 * limits to be concerned about: 2096 * 1) There is a limit on the number of small pic GOT indices, 2097 * given by M_GOT_MAXSMALL. 2098 * 2) If there are more than (M_GOT_MAXSMALL/2 - M_GOT_XNumber) 2099 * small GOT indices, there will be items at negative 2100 * offsets from _GLOBAL_OFFSET_TABLE_. Items that are 2101 * accessed via large (PIC) code cannot reach these 2102 * negative slots, so mixed mode items must be in the 2103 * non-negative range. This implies a limit of 2104 * (M_GOT_MAXSMALL/2 - M_GOT_XNumber) mixed mode indices. 2105 */ 2106 if (smlgotcnt > M_GOT_MAXSMALL) { 2107 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_SMALLGOT), 2108 EC_WORD(smlgotcnt), M_GOT_MAXSMALL); 2109 return (S_ERROR); 2110 } 2111 if (mixgotcnt > (first_large_ndx - M_GOT_XNumber)) { 2112 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_MIXEDGOT), 2113 EC_WORD(mixgotcnt), first_large_ndx - M_GOT_XNumber); 2114 return (S_ERROR); 2115 } 2116 2117 /* 2118 * Set starting offset to be either 0, or a negative index into 2119 * the GOT based on the number of small symbols we've got. 2120 */ 2121 neggotoffset = ((smlgotcnt >= first_large_ndx) ? 2122 (first_large_ndx - smlgotcnt) : 0); 2123 2124 /* 2125 * Initialize the got offsets used by assign_got() to 2126 * locate GOT items: 2127 * small - Starting index of items referenced only 2128 * by small offsets (-Kpic). 2129 * mixed - Starting index of items referenced 2130 * by both large (-KPIC) and small (-Kpic). 2131 * large - Indexes referenced only by large (-KPIC) 2132 * 2133 * Small items can have negative indexes (i.e. lie below 2134 * _GLOBAL_OFFSET_TABLE_). Mixed and large items must have 2135 * non-negative offsets. 2136 */ 2137 small_index = (neggotoffset == 0) ? M_GOT_XNumber : neggotoffset; 2138 large_index = neggotoffset + smlgotcnt; 2139 mixed_index = large_index - mixgotcnt; 2140 2141 /* 2142 * Assign bias to GOT symbols. 2143 */ 2144 addr = -neggotoffset * M_GOT_ENTSIZE; 2145 if (sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL), SYM_NOHASH, 0, ofl)) 2146 sdp->sd_sym->st_value = addr; 2147 if (sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL_U), SYM_NOHASH, 0, ofl)) 2148 sdp->sd_sym->st_value = addr; 2149 2150 if (ofl->ofl_tlsldgotndx) { 2151 ofl->ofl_tlsldgotndx->gn_gotndx = large_index; 2152 large_index += 2; 2153 } 2154 return (1); 2155 } 2156 2157 /* 2158 * Initializes .got[0] with the _DYNAMIC symbol value. 2159 */ 2160 static uintptr_t 2161 ld_fillin_gotplt(Ofl_desc *ofl) 2162 { 2163 if (ofl->ofl_osgot) { 2164 Sym_desc *sdp; 2165 2166 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 2167 SYM_NOHASH, 0, ofl)) != NULL) { 2168 uchar_t *genptr; 2169 2170 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 2171 (-neggotoffset * M_GOT_ENTSIZE) + 2172 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 2173 /* LINTED */ 2174 *((Xword *)genptr) = sdp->sd_sym->st_value; 2175 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 2176 /* LINTED */ 2177 *((Xword *)genptr) = 2178 /* LINTED */ 2179 ld_bswap_Xword(*((Xword *)genptr)); 2180 } 2181 } 2182 return (1); 2183 } 2184 2185 2186 2187 /* 2188 * Template for generating "void (*)(void)" function 2189 */ 2190 static const uchar_t nullfunc_tmpl[] = { 2191 /* 0x00 */ 0x81, 0xc3, 0xe0, 0x08, /* retl */ 2192 /* 0x04 */ 0x01, 0x00, 0x00, 0x00 /* nop */ 2193 }; 2194 2195 2196 2197 /* 2198 * Return the ld_targ definition for this target. 2199 */ 2200 const Target * 2201 ld_targ_init_sparc(void) 2202 { 2203 static const Target _ld_targ = { 2204 { /* Target_mach */ 2205 M_MACH, /* m_mach */ 2206 M_MACHPLUS, /* m_machplus */ 2207 M_FLAGSPLUS, /* m_flagsplus */ 2208 M_CLASS, /* m_class */ 2209 M_DATA, /* m_data */ 2210 2211 M_SEGM_ALIGN, /* m_segm_align */ 2212 M_SEGM_ORIGIN, /* m_segm_origin */ 2213 M_SEGM_AORIGIN, /* m_segm_aorigin */ 2214 M_DATASEG_PERM, /* m_dataseg_perm */ 2215 M_WORD_ALIGN, /* m_word_align */ 2216 /* m_def_interp */ 2217 #if defined(_ELF64) 2218 MSG_ORIG(MSG_PTH_RTLD_SPARCV9), 2219 #else 2220 MSG_ORIG(MSG_PTH_RTLD), 2221 #endif 2222 2223 /* Relocation type codes */ 2224 M_R_ARRAYADDR, /* m_r_arrayaddr */ 2225 M_R_COPY, /* m_r_copy */ 2226 M_R_GLOB_DAT, /* m_r_glob_dat */ 2227 M_R_JMP_SLOT, /* m_r_jmp_slot */ 2228 M_R_NUM, /* m_r_num */ 2229 M_R_NONE, /* m_r_none */ 2230 M_R_RELATIVE, /* m_r_relative */ 2231 M_R_REGISTER, /* m_r_register */ 2232 2233 /* Relocation related constants */ 2234 M_REL_DT_COUNT, /* m_rel_dt_count */ 2235 M_REL_DT_ENT, /* m_rel_dt_ent */ 2236 M_REL_DT_SIZE, /* m_rel_dt_size */ 2237 M_REL_DT_TYPE, /* m_rel_dt_type */ 2238 M_REL_SHT_TYPE, /* m_rel_sht_type */ 2239 2240 /* GOT related constants */ 2241 M_GOT_ENTSIZE, /* m_got_entsize */ 2242 M_GOT_XNumber, /* m_got_xnumber */ 2243 2244 /* PLT related constants */ 2245 M_PLT_ALIGN, /* m_plt_align */ 2246 M_PLT_ENTSIZE, /* m_plt_entsize */ 2247 M_PLT_RESERVSZ, /* m_plt_reservsz */ 2248 M_PLT_SHF_FLAGS, /* m_plt_shf_flags */ 2249 2250 M_DT_REGISTER, /* m_dt_register */ 2251 }, 2252 { /* Target_machid */ 2253 M_ID_ARRAY, /* id_array */ 2254 M_ID_BSS, /* id_bss */ 2255 M_ID_CAP, /* id_cap */ 2256 M_ID_DATA, /* id_data */ 2257 M_ID_DYNAMIC, /* id_dynamic */ 2258 M_ID_DYNSORT, /* id_dynsort */ 2259 M_ID_DYNSTR, /* id_dynstr */ 2260 M_ID_DYNSYM, /* id_dynsym */ 2261 M_ID_DYNSYM_NDX, /* id_dynsym_ndx */ 2262 M_ID_GOT, /* id_got */ 2263 M_ID_GOTDATA, /* id_gotdata */ 2264 M_ID_HASH, /* id_hash */ 2265 M_ID_INTERP, /* id_interp */ 2266 M_ID_UNKNOWN, /* id_lbss (unused) */ 2267 M_ID_LDYNSYM, /* id_ldynsym */ 2268 M_ID_NOTE, /* id_note */ 2269 M_ID_NULL, /* id_null */ 2270 M_ID_PLT, /* id_plt */ 2271 M_ID_REL, /* id_rel */ 2272 M_ID_STRTAB, /* id_strtab */ 2273 M_ID_SYMINFO, /* id_syminfo */ 2274 M_ID_SYMTAB, /* id_symtab */ 2275 M_ID_SYMTAB_NDX, /* id_symtab_ndx */ 2276 M_ID_TEXT, /* id_text */ 2277 M_ID_TLS, /* id_tls */ 2278 M_ID_TLSBSS, /* id_tlsbss */ 2279 M_ID_UNKNOWN, /* id_unknown */ 2280 M_ID_UNKNOWN, /* id_unwind (unused) */ 2281 M_ID_USER, /* id_user */ 2282 M_ID_VERSION, /* id_version */ 2283 }, 2284 { /* Target_nullfunc */ 2285 nullfunc_tmpl, /* nf_template */ 2286 sizeof (nullfunc_tmpl), /* nf_size */ 2287 }, 2288 { /* Target_machrel */ 2289 reloc_table, 2290 2291 ld_init_rel, /* mr_init_rel */ 2292 ld_mach_eflags, /* mr_mach_eflags */ 2293 ld_mach_make_dynamic, /* mr_mach_make_dynamic */ 2294 ld_mach_update_odynamic, /* mr_mach_update_odynamic */ 2295 ld_calc_plt_addr, /* mr_calc_plt_addr */ 2296 ld_perform_outreloc, /* mr_perform_outreloc */ 2297 ld_do_activerelocs, /* mr_do_activerelocs */ 2298 ld_add_outrel, /* mr_add_outrel */ 2299 ld_reloc_register, /* mr_reloc_register */ 2300 ld_reloc_local, /* mr_reloc_local */ 2301 ld_reloc_GOTOP, /* mr_reloc_GOTOP */ 2302 ld_reloc_TLS, /* mr_reloc_TLS */ 2303 ld_assign_got, /* mr_assign_got */ 2304 ld_find_gotndx, /* mr_find_gotndx */ 2305 ld_calc_got_offset, /* mr_calc_got_offset */ 2306 ld_assign_got_ndx, /* mr_assign_got_ndx */ 2307 ld_assign_plt_ndx, /* mr_assign_plt_ndx */ 2308 ld_allocate_got, /* mr_allocate_got */ 2309 ld_fillin_gotplt, /* mr_fillin_gotplt */ 2310 }, 2311 { /* Target_machsym */ 2312 ld_reg_check_sparc, /* ms_reg_check */ 2313 ld_mach_sym_typecheck_sparc, /* ms_mach_sym_typecheck */ 2314 ld_is_regsym_sparc, /* ms_is_regsym */ 2315 ld_reg_find_sparc, /* ms_reg_find */ 2316 ld_reg_enter_sparc /* ms_reg_enter */ 2317 }, 2318 { /* Target_unwind */ 2319 NULL, /* uw_make_unwindhdr */ 2320 NULL, /* uw_populate_unwindhdr */ 2321 NULL, /* uw_append_unwind */ 2322 } 2323 }; 2324 2325 return (&_ld_targ); 2326 } 2327