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 2007 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <string.h> 32 #include <stdio.h> 33 #include <sys/elf_SPARC.h> 34 #include <debug.h> 35 #include <reloc.h> 36 #include "msg.h" 37 #include "_libld.h" 38 39 /* 40 * Local Variable Definitions 41 */ 42 static Sword neggotoffset = 0; /* off. of GOT table from GOT symbol */ 43 static Sword smlgotcnt = M_GOT_XNumber; /* no. of small GOT symbols */ 44 static Sword mixgotcnt = 0; /* # syms with both large/small GOT */ 45 46 Word 47 ld_init_rel(Rel_desc *reld, void *reloc) 48 { 49 Rela * rela = (Rela *)reloc; 50 51 /* LINTED */ 52 reld->rel_rtype = (Word)ELF_R_TYPE(rela->r_info); 53 reld->rel_roffset = rela->r_offset; 54 reld->rel_raddend = rela->r_addend; 55 reld->rel_typedata = (Word)ELF_R_TYPE_DATA(rela->r_info); 56 57 reld->rel_flags |= FLG_REL_RELA; 58 59 return ((Word)ELF_R_SYM(rela->r_info)); 60 } 61 62 void 63 ld_mach_eflags(Ehdr *ehdr, Ofl_desc *ofl) 64 { 65 Word eflags = ofl->ofl_dehdr->e_flags; 66 Word memopt1, memopt2; 67 static int firstpass; 68 69 /* 70 * If a *PLUS relocatable is included, the output object is type *PLUS. 71 */ 72 if ((ehdr->e_machine == EM_SPARC32PLUS) && 73 (ehdr->e_flags & EF_SPARC_32PLUS)) 74 ofl->ofl_dehdr->e_machine = EM_SPARC32PLUS; 75 76 /* 77 * On the first pass, we don't yet have a memory model to compare 78 * against, therefore the initial file becomes our baseline. Subsequent 79 * passes will do the comparison described below. 80 */ 81 if (firstpass == 0) { 82 ofl->ofl_dehdr->e_flags |= ehdr->e_flags; 83 firstpass++; 84 return; 85 } 86 87 /* 88 * Determine which memory model to mark the binary with. The options 89 * are (most restrictive to least): 90 * 91 * EF_SPARCV9_TSO 0x0 Total Store Order 92 * EF_SPARCV9_PSO 0x1 Partial Store Order 93 * EF_SPARCV9_RMO 0x2 Relaxed Memory Order 94 * 95 * Mark the binary with the most restrictive option encountered from a 96 * relocatable object included in the link. 97 */ 98 eflags |= (ehdr->e_flags & ~EF_SPARCV9_MM); 99 memopt1 = eflags & EF_SPARCV9_MM; 100 memopt2 = ehdr->e_flags & EF_SPARCV9_MM; 101 eflags &= ~EF_SPARCV9_MM; 102 103 if ((memopt1 == EF_SPARCV9_TSO) || (memopt2 == EF_SPARCV9_TSO)) 104 /* EMPTY */ 105 ; 106 else if ((memopt1 == EF_SPARCV9_PSO) || (memopt2 == EF_SPARCV9_PSO)) 107 eflags |= EF_SPARCV9_PSO; 108 else 109 eflags |= EF_SPARCV9_RMO; 110 111 ofl->ofl_dehdr->e_flags = eflags; 112 } 113 114 void 115 ld_mach_make_dynamic(Ofl_desc *ofl, size_t *cnt) 116 { 117 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) { 118 /* 119 * Create this entry if we are going to create a PLT table. 120 */ 121 if (ofl->ofl_pltcnt) 122 (*cnt)++; /* DT_PLTGOT */ 123 } 124 } 125 126 void 127 ld_mach_update_odynamic(Ofl_desc *ofl, Dyn **dyn) 128 { 129 if (((ofl->ofl_flags & FLG_OF_RELOBJ) == 0) && ofl->ofl_pltcnt) { 130 (*dyn)->d_tag = DT_PLTGOT; 131 if (ofl->ofl_osplt) 132 (*dyn)->d_un.d_ptr = ofl->ofl_osplt->os_shdr->sh_addr; 133 else 134 (*dyn)->d_un.d_ptr = 0; 135 (*dyn)++; 136 } 137 } 138 139 #if defined(_ELF64) 140 141 Xword 142 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 143 { 144 Xword value, pltndx, farpltndx; 145 146 pltndx = sdp->sd_aux->sa_PLTndx + M_PLT_XNumber - 1; 147 148 if ((pltndx) < M64_PLT_NEARPLTS) { 149 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 150 (pltndx * M_PLT_ENTSIZE); 151 return (value); 152 } 153 154 farpltndx = pltndx - M64_PLT_NEARPLTS; 155 156 /* 157 * pltoffset of a far plt is calculated by: 158 * 159 * <size of near plt table> + 160 * <size of preceding far plt blocks> + 161 * <blockndx * sizeof (far plt entsize)> 162 */ 163 value = 164 /* size of near plt table */ 165 (M64_PLT_NEARPLTS * M_PLT_ENTSIZE) + 166 /* size of preceding far plt blocks */ 167 ((farpltndx / M64_PLT_FBLKCNTS) * 168 ((M64_PLT_FENTSIZE + sizeof (Addr)) * 169 M64_PLT_FBLKCNTS)) + 170 /* pltblockendx * fentsize */ 171 ((farpltndx % M64_PLT_FBLKCNTS) * M64_PLT_FENTSIZE); 172 173 value += (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 174 return (value); 175 } 176 177 /* 178 * Instructions required for Far PLT's 179 */ 180 static uint32_t farplt_instrs[6] = { 181 0x8a10000f, /* mov %o7, %g5 */ 182 0x40000002, /* call . + 0x8 */ 183 0x01000000, /* nop */ 184 0xc25be000, /* ldx [%o7 + 0], %g1 */ 185 0x83c3c001, /* jmpl %o7 + %g1, %g1 */ 186 0x9e100005 /* mov %g5, %o7 */ 187 }; 188 189 /* 190 * Far PLT'S: 191 * 192 * Far PLT's are established in blocks of '160' at a time. These 193 * PLT's consist of 6 instructions (24 bytes) and 1 pointer (8 bytes). 194 * The instructions are collected together in blocks of 160 entries 195 * followed by 160 pointers. The last group of entries and pointers 196 * may contain less then 160 items. No padding is required. 197 * 198 * .PLT32768: 199 * mov %o7, %g5 200 * call . + 8 201 * nop 202 * ldx [%o7 + .PLTP32768 - (.PLT32768 + 4)], %g1 203 * jmpl %o7 + %g1, %g1 204 * mov %g5, %o7 205 * ................................ 206 * .PLT32927: 207 * mov %o7, %g5 208 * call . + 8 209 * nop 210 * ldx [%o7 + .PLTP32927 - (.PLT32927 + 4)], %g1 211 * jmpl %o7 + %g1, %g1 212 * mov %g5, %o7 213 * .PLTP32768: 214 * .xword .PLT0-(.PLT32768+4) 215 * ................................ 216 * .PLTP32927: 217 * .xword .PLT0-(.PLT32927+4) 218 * 219 */ 220 void 221 plt_far_entry(Ofl_desc *ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 222 { 223 uint_t blockndx; /* # of far PLT blocks */ 224 uint_t farblkcnt; /* Index to far PLT block */ 225 Xword farpltndx; /* index of Far Plt */ 226 Xword farpltblkndx; /* index of PLT in BLOCK */ 227 uint32_t *pltent; /* ptr to plt instr. sequence */ 228 uint64_t *pltentptr; /* ptr to plt addr ptr */ 229 Sxword pltblockoff; /* offset to Far plt block */ 230 Sxword pltoff; /* offset to PLT instr. sequence */ 231 Sxword pltptroff; /* offset to PLT addr ptr */ 232 uchar_t *pltbuf; /* ptr to PLT's in file */ 233 234 235 farblkcnt = ((ofl->ofl_pltcnt - 1 + 236 M_PLT_XNumber - M64_PLT_NEARPLTS) / M64_PLT_FBLKCNTS); 237 238 /* 239 * Determine the 'Far' PLT index. 240 */ 241 farpltndx = pltndx - 1 + M_PLT_XNumber - M64_PLT_NEARPLTS; 242 farpltblkndx = farpltndx % M64_PLT_FBLKCNTS; 243 244 /* 245 * Determine what FPLT block this plt falls into. 246 */ 247 blockndx = (uint_t)(farpltndx / M64_PLT_FBLKCNTS); 248 249 /* 250 * Calculate the starting offset of the Far PLT block 251 * that this PLT is a member of. 252 */ 253 pltblockoff = (M64_PLT_NEARPLTS * M_PLT_ENTSIZE) + 254 (blockndx * M64_PLT_FBLOCKSZ); 255 256 pltoff = pltblockoff + 257 (farpltblkndx * M64_PLT_FENTSIZE); 258 259 pltptroff = pltblockoff; 260 261 262 if (farblkcnt > blockndx) { 263 /* 264 * If this is a full block - the 'pltptroffs' start 265 * after 160 fplts. 266 */ 267 pltptroff += (M64_PLT_FBLKCNTS * M64_PLT_FENTSIZE) + 268 (farpltblkndx * M64_PLT_PSIZE); 269 } else { 270 Xword lastblkpltndx; 271 /* 272 * If this is the last block - the the pltptr's start 273 * after the last FPLT instruction sequence. 274 */ 275 lastblkpltndx = (ofl->ofl_pltcnt - 1 + M_PLT_XNumber - 276 M64_PLT_NEARPLTS) % M64_PLT_FBLKCNTS; 277 pltptroff += ((lastblkpltndx + 1) * M64_PLT_FENTSIZE) + 278 (farpltblkndx * M64_PLT_PSIZE); 279 } 280 pltbuf = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf; 281 282 /* 283 * For far-plts, the Raddend and Roffset fields are defined 284 * to be: 285 * 286 * roffset: address of .PLTP# 287 * raddend: -(.PLT#+4) 288 */ 289 *roffset = pltptroff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 290 *raddend = -(pltoff + 4 + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr)); 291 292 /* LINTED */ 293 pltent = (uint32_t *)(pltbuf + pltoff); 294 /* LINTED */ 295 pltentptr = (uint64_t *)(pltbuf + pltptroff); 296 (void) memcpy(pltent, farplt_instrs, sizeof (farplt_instrs)); 297 298 /* 299 * update 300 * ldx [%o7 + 0], %g1 301 * to 302 * ldx [%o7 + .PLTP# - (.PLT# + 4)], %g1 303 */ 304 /* LINTED */ 305 pltent[3] |= (uint32_t)(pltptroff - (pltoff + 4)); 306 307 /* 308 * Store: 309 * .PLTP# 310 * .xword .PLT0 - .PLT# + 4 311 */ 312 *pltentptr = -(pltoff + 4); 313 } 314 315 /* 316 * Build a single V9 P.L.T. entry - code is: 317 * 318 * For Target Addresses +/- 4GB of the entry 319 * ----------------------------------------- 320 * sethi (. - .PLT0), %g1 321 * ba,a %xcc, .PLT1 322 * nop 323 * nop 324 * nop 325 * nop 326 * nop 327 * nop 328 * 329 * For Target Addresses +/- 2GB of the entry 330 * ----------------------------------------- 331 * 332 * .PLT0 is the address of the first entry in the P.L.T. 333 * This one is filled in by the run-time link editor. We just 334 * have to leave space for it. 335 */ 336 static void 337 plt_entry(Ofl_desc *ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 338 { 339 uchar_t *pltent; /* PLT entry being created. */ 340 Sxword pltoff; /* Offset of this entry from PLT top */ 341 342 /* 343 * The second part of the V9 ABI (sec. 5.2.4) 344 * applies to plt entries greater than 0x8000 (32,768). 345 * This is handled in 'plt_far_entry()' 346 */ 347 if ((pltndx - 1 + M_PLT_XNumber) >= M64_PLT_NEARPLTS) { 348 plt_far_entry(ofl, pltndx, roffset, raddend); 349 return; 350 } 351 352 pltoff = M_PLT_RESERVSZ + (pltndx - 1) * M_PLT_ENTSIZE; 353 pltent = (uchar_t *)ofl->ofl_osplt->os_outdata->d_buf + pltoff; 354 355 *roffset = pltoff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 356 *raddend = 0; 357 358 /* 359 * PLT[0]: sethi %hi(. - .L0), %g1 360 */ 361 /* LINTED */ 362 *(Word *)pltent = M_SETHIG1 | pltoff; 363 364 /* 365 * PLT[1]: ba,a %xcc, .PLT1 (.PLT1 accessed as a 366 * PC-relative index of longwords). 367 */ 368 pltent += M_PLT_INSSIZE; 369 pltoff += M_PLT_INSSIZE; 370 pltoff = -pltoff; 371 /* LINTED */ 372 *(Word *)pltent = M_BA_A_XCC | 373 (((pltoff + M_PLT_ENTSIZE) >> 2) & S_MASK(19)); 374 375 /* 376 * PLT[2]: sethi 0, %g0 (NOP for delay slot of eventual CTI). 377 */ 378 pltent += M_PLT_INSSIZE; 379 /* LINTED */ 380 *(Word *)pltent = M_NOP; 381 382 /* 383 * PLT[3]: sethi 0, %g0 (NOP for PLT padding). 384 */ 385 pltent += M_PLT_INSSIZE; 386 /* LINTED */ 387 *(Word *)pltent = M_NOP; 388 389 /* 390 * PLT[4]: sethi 0, %g0 (NOP for PLT padding). 391 */ 392 pltent += M_PLT_INSSIZE; 393 /* LINTED */ 394 *(Word *)pltent = M_NOP; 395 396 /* 397 * PLT[5]: sethi 0, %g0 (NOP for PLT padding). 398 */ 399 pltent += M_PLT_INSSIZE; 400 /* LINTED */ 401 *(Word *)pltent = M_NOP; 402 403 /* 404 * PLT[6]: sethi 0, %g0 (NOP for PLT padding). 405 */ 406 pltent += M_PLT_INSSIZE; 407 /* LINTED */ 408 *(Word *)pltent = M_NOP; 409 410 /* 411 * PLT[7]: sethi 0, %g0 (NOP for PLT padding). 412 */ 413 pltent += M_PLT_INSSIZE; 414 /* LINTED */ 415 *(Word *)pltent = M_NOP; 416 } 417 418 419 #else /* Elf 32 */ 420 421 Xword 422 ld_calc_plt_addr(Sym_desc *sdp, Ofl_desc *ofl) 423 { 424 Xword value, pltndx; 425 426 pltndx = sdp->sd_aux->sa_PLTndx + M_PLT_XNumber - 1; 427 value = (Xword)(ofl->ofl_osplt->os_shdr->sh_addr) + 428 (pltndx * M_PLT_ENTSIZE); 429 return (value); 430 } 431 432 433 /* 434 * Build a single P.L.T. entry - code is: 435 * 436 * sethi (. - .L0), %g1 437 * ba,a .L0 438 * sethi 0, %g0 (nop) 439 * 440 * .L0 is the address of the first entry in the P.L.T. 441 * This one is filled in by the run-time link editor. We just 442 * have to leave space for it. 443 */ 444 static void 445 plt_entry(Ofl_desc * ofl, Xword pltndx, Xword *roffset, Sxword *raddend) 446 { 447 Byte * pltent; /* PLT entry being created. */ 448 Sxword pltoff; /* Offset of this entry from PLT top */ 449 450 pltoff = M_PLT_RESERVSZ + (pltndx - 1) * M_PLT_ENTSIZE; 451 pltent = (Byte *)ofl->ofl_osplt->os_outdata->d_buf + pltoff; 452 453 *roffset = pltoff + (Xword)(ofl->ofl_osplt->os_shdr->sh_addr); 454 *raddend = 0; 455 456 /* 457 * PLT[0]: sethi %hi(. - .L0), %g1 458 */ 459 /* LINTED */ 460 *(Word *)pltent = M_SETHIG1 | pltoff; 461 462 /* 463 * PLT[1]: ba,a .L0 (.L0 accessed as a PC-relative index of longwords) 464 */ 465 pltent += M_PLT_INSSIZE; 466 pltoff += M_PLT_INSSIZE; 467 pltoff = -pltoff; 468 /* LINTED */ 469 *(Word *)pltent = M_BA_A | ((pltoff >> 2) & S_MASK(22)); 470 471 /* 472 * PLT[2]: sethi 0, %g0 (NOP for delay slot of eventual CTI). 473 */ 474 pltent += M_PLT_INSSIZE; 475 /* LINTED */ 476 *(Word *)pltent = M_SETHIG0; 477 478 /* 479 * PLT[3]: sethi 0, %g0 (NOP for PLT padding). 480 */ 481 pltent += M_PLT_INSSIZE; 482 /* LINTED */ 483 *(Word *)pltent = M_SETHIG0; 484 } 485 486 #endif /* _ELF64 */ 487 488 uintptr_t 489 ld_perform_outreloc(Rel_desc * orsp, Ofl_desc * ofl) 490 { 491 Os_desc * relosp, * osp = 0; 492 Xword ndx, roffset, value; 493 Sxword raddend; 494 const Rel_entry * rep; 495 Rela rea; 496 char *relbits; 497 Sym_desc * sdp, * psym = (Sym_desc *)0; 498 int sectmoved = 0; 499 Word dtflags1 = ofl->ofl_dtflags_1; 500 Word flags = ofl->ofl_flags; 501 502 raddend = orsp->rel_raddend; 503 sdp = orsp->rel_sym; 504 505 /* 506 * Special case, a regsiter symbol associated with symbol 507 * index 0 is initialized (i.e. relocated) to a constant 508 * in the r_addend field rather than to a symbol value. 509 */ 510 if ((orsp->rel_rtype == M_R_REGISTER) && !sdp) { 511 relosp = ofl->ofl_osrel; 512 relbits = (char *)relosp->os_outdata->d_buf; 513 514 rea.r_info = ELF_R_INFO(0, 515 ELF_R_TYPE_INFO(orsp->rel_typedata, orsp->rel_rtype)); 516 rea.r_offset = orsp->rel_roffset; 517 rea.r_addend = raddend; 518 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, 519 relosp->os_name, orsp->rel_sname)); 520 521 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 522 (void) memcpy((relbits + relosp->os_szoutrels), 523 (char *)&rea, sizeof (Rela)); 524 relosp->os_szoutrels += (Xword)sizeof (Rela); 525 526 return (1); 527 } 528 529 /* 530 * If the section this relocation is against has been discarded 531 * (-zignore), then also discard (skip) the relocation itself. 532 */ 533 if (orsp->rel_isdesc && ((orsp->rel_flags & 534 (FLG_REL_GOT | FLG_REL_BSS | FLG_REL_PLT | FLG_REL_NOINFO)) == 0) && 535 (orsp->rel_isdesc->is_flags & FLG_IS_DISCARD)) { 536 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, M_MACH, orsp)); 537 return (1); 538 } 539 540 /* 541 * If this is a relocation against a move table, or expanded move 542 * table, adjust the relocation entries. 543 */ 544 if (orsp->rel_move) 545 ld_adj_movereloc(ofl, orsp); 546 547 /* 548 * If this is a relocation against a section then we need to adjust the 549 * raddend field to compensate for the new position of the input section 550 * within the new output section. 551 */ 552 if (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION) { 553 if (ofl->ofl_parsym.head && 554 (sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 555 (psym = ld_am_I_partial(orsp, orsp->rel_raddend))) { 556 /* 557 * If the symbol is moved, adjust the value 558 */ 559 DBG_CALL(Dbg_move_outsctadj(ofl->ofl_lml, psym)); 560 sectmoved = 1; 561 if (ofl->ofl_flags & FLG_OF_RELOBJ) 562 raddend = psym->sd_sym->st_value; 563 else 564 raddend = psym->sd_sym->st_value - 565 psym->sd_isc->is_osdesc->os_shdr->sh_addr; 566 /* LINTED */ 567 raddend += (Off)_elf_getxoff(psym->sd_isc->is_indata); 568 if (psym->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 569 raddend += 570 psym->sd_isc->is_osdesc->os_shdr->sh_addr; 571 } else { 572 /* LINTED */ 573 raddend += (Off)_elf_getxoff(sdp->sd_isc->is_indata); 574 if (sdp->sd_isc->is_shdr->sh_flags & SHF_ALLOC) 575 raddend += 576 sdp->sd_isc->is_osdesc->os_shdr->sh_addr; 577 } 578 } 579 580 value = sdp->sd_sym->st_value; 581 582 if (orsp->rel_flags & FLG_REL_GOT) { 583 osp = ofl->ofl_osgot; 584 roffset = ld_calc_got_offset(orsp, ofl); 585 586 } else if (orsp->rel_flags & FLG_REL_PLT) { 587 osp = ofl->ofl_osplt; 588 plt_entry(ofl, sdp->sd_aux->sa_PLTndx, &roffset, &raddend); 589 } else if (orsp->rel_flags & FLG_REL_BSS) { 590 /* 591 * This must be a R_SPARC_COPY. For these set the roffset to 592 * point to the new symbols location. 593 */ 594 osp = ofl->ofl_isbss->is_osdesc; 595 roffset = (Xword)value; 596 597 /* 598 * The raddend doesn't mean anything in an R_SPARC_COPY 599 * relocation. Null it out because it can confuse people. 600 */ 601 raddend = 0; 602 } else if (orsp->rel_flags & FLG_REL_REG) { 603 /* 604 * The offsets of relocations against register symbols 605 * identifiy the register directly - so the offset 606 * does not need to be adjusted. 607 */ 608 roffset = orsp->rel_roffset; 609 } else { 610 osp = orsp->rel_osdesc; 611 612 /* 613 * Calculate virtual offset of reference point; equals offset 614 * into section + vaddr of section for loadable sections, or 615 * offset plus section displacement for nonloadable sections. 616 */ 617 roffset = orsp->rel_roffset + 618 (Off)_elf_getxoff(orsp->rel_isdesc->is_indata); 619 if (!(ofl->ofl_flags & FLG_OF_RELOBJ)) 620 roffset += orsp->rel_isdesc->is_osdesc-> 621 os_shdr->sh_addr; 622 } 623 624 if ((osp == 0) || ((relosp = osp->os_relosdesc) == 0)) 625 relosp = ofl->ofl_osrel; 626 627 /* 628 * Verify that the output relocations offset meets the 629 * alignment requirements of the relocation being processed. 630 */ 631 rep = &reloc_table[orsp->rel_rtype]; 632 if (((flags & FLG_OF_RELOBJ) || !(dtflags1 & DF_1_NORELOC)) && 633 !(rep->re_flags & FLG_RE_UNALIGN)) { 634 if (((rep->re_fsize == 2) && (roffset & 0x1)) || 635 ((rep->re_fsize == 4) && (roffset & 0x3)) || 636 ((rep->re_fsize == 8) && (roffset & 0x7))) { 637 Conv_inv_buf_t inv_buf; 638 639 eprintf(ofl->ofl_lml, ERR_FATAL, 640 MSG_INTL(MSG_REL_NONALIGN), 641 conv_reloc_SPARC_type(orsp->rel_rtype, 0, &inv_buf), 642 orsp->rel_isdesc->is_file->ifl_name, 643 demangle(orsp->rel_sname), EC_XWORD(roffset)); 644 return (S_ERROR); 645 } 646 } 647 648 /* 649 * Assign the symbols index for the output relocation. If the 650 * relocation refers to a SECTION symbol then it's index is based upon 651 * the output sections symbols index. Otherwise the index can be 652 * derived from the symbols index itself. 653 */ 654 if (orsp->rel_rtype == R_SPARC_RELATIVE) 655 ndx = STN_UNDEF; 656 else if ((orsp->rel_flags & FLG_REL_SCNNDX) || 657 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION)) { 658 if (sectmoved == 0) { 659 /* 660 * Check for a null input section. This can 661 * occur if this relocation references a symbol 662 * generated by sym_add_sym(). 663 */ 664 if ((sdp->sd_isc != 0) && 665 (sdp->sd_isc->is_osdesc != 0)) 666 ndx = sdp->sd_isc->is_osdesc->os_scnsymndx; 667 else 668 ndx = sdp->sd_shndx; 669 } else 670 ndx = ofl->ofl_sunwdata1ndx; 671 } else 672 ndx = sdp->sd_symndx; 673 674 /* 675 * Add the symbols 'value' to the addend field. 676 */ 677 if (orsp->rel_flags & FLG_REL_ADVAL) 678 raddend += value; 679 680 /* 681 * The addend field for R_SPARC_TLS_DTPMOD32 and R_SPARC_TLS_DTPMOD64 682 * mean nothing. The addend is propagated in the corresponding 683 * R_SPARC_TLS_DTPOFF* relocations. 684 */ 685 if (orsp->rel_rtype == M_R_DTPMOD) 686 raddend = 0; 687 688 relbits = (char *)relosp->os_outdata->d_buf; 689 690 rea.r_info = ELF_R_INFO(ndx, ELF_R_TYPE_INFO(orsp->rel_typedata, 691 orsp->rel_rtype)); 692 rea.r_offset = roffset; 693 rea.r_addend = raddend; 694 DBG_CALL(Dbg_reloc_out(ofl, ELF_DBG_LD, SHT_RELA, &rea, relosp->os_name, 695 orsp->rel_sname)); 696 697 /* 698 * Assert we haven't walked off the end of our relocation table. 699 */ 700 assert(relosp->os_szoutrels <= relosp->os_shdr->sh_size); 701 702 (void) memcpy((relbits + relosp->os_szoutrels), 703 (char *)&rea, sizeof (Rela)); 704 relosp->os_szoutrels += (Xword)sizeof (Rela); 705 706 /* 707 * Determine if this relocation is against a non-writable, allocatable 708 * section. If so we may need to provide a text relocation diagnostic. 709 */ 710 ld_reloc_remain_entry(orsp, osp, ofl); 711 return (1); 712 } 713 714 715 /* 716 * Sparc Instructions for TLS processing 717 */ 718 #if defined(_ELF64) 719 #define TLS_GD_IE_LD 0xd0580000 /* ldx [%g0 + %g0], %o0 */ 720 #else 721 #define TLS_GD_IE_LD 0xd0000000 /* ld [%g0 + %g0], %o0 */ 722 #endif 723 #define TLS_GD_IE_ADD 0x9001c008 /* add %g7, %o0, %o0 */ 724 725 #define TLS_GD_LE_XOR 0x80182000 /* xor %g0, 0, %g0 */ 726 #define TLS_IE_LE_OR 0x80100000 /* or %g0, %o0, %o1 */ 727 /* synthetic: mov %g0, %g0 */ 728 729 #define TLS_LD_LE_CLRO0 0x90100000 /* clr %o0 */ 730 731 #define FM3_REG_MSK_RD (0x1f << 25) /* Formate (3) rd register mask */ 732 /* bits 25->29 */ 733 #define FM3_REG_MSK_RS1 (0x1f << 14) /* Formate (3) rs1 register mask */ 734 /* bits 14->18 */ 735 #define FM3_REG_MSK_RS2 0x1f /* Formate (3) rs2 register mask */ 736 /* bits 0->4 */ 737 738 #define REG_G7 7 /* %g7 register */ 739 740 static Fixupret 741 tls_fixups(Ofl_desc *ofl, Rel_desc *arsp) 742 { 743 Sym_desc *sdp = arsp->rel_sym; 744 Word rtype = arsp->rel_rtype; 745 uint_t *offset; 746 747 offset = (uint_t *)((uintptr_t)arsp->rel_roffset + 748 (uintptr_t)_elf_getxoff(arsp->rel_isdesc->is_indata) + 749 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 750 751 if (sdp->sd_ref == REF_DYN_NEED) { 752 /* 753 * IE reference model 754 */ 755 switch (rtype) { 756 case R_SPARC_TLS_GD_HI22: 757 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 758 R_SPARC_TLS_IE_HI22, arsp)); 759 arsp->rel_rtype = R_SPARC_TLS_IE_HI22; 760 return (FIX_RELOC); 761 762 case R_SPARC_TLS_GD_LO10: 763 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 764 R_SPARC_TLS_IE_LO10, arsp)); 765 arsp->rel_rtype = R_SPARC_TLS_IE_LO10; 766 return (FIX_RELOC); 767 768 case R_SPARC_TLS_GD_ADD: 769 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 770 R_SPARC_NONE, arsp)); 771 *offset = (TLS_GD_IE_LD | 772 (*offset & (FM3_REG_MSK_RS1 | FM3_REG_MSK_RS2))); 773 return (FIX_DONE); 774 775 case R_SPARC_TLS_GD_CALL: 776 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 777 R_SPARC_NONE, arsp)); 778 *offset = TLS_GD_IE_ADD; 779 return (FIX_DONE); 780 } 781 return (FIX_RELOC); 782 } 783 784 /* 785 * LE reference model 786 */ 787 switch (rtype) { 788 case R_SPARC_TLS_IE_HI22: 789 case R_SPARC_TLS_GD_HI22: 790 case R_SPARC_TLS_LDO_HIX22: 791 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 792 R_SPARC_TLS_LE_HIX22, arsp)); 793 arsp->rel_rtype = R_SPARC_TLS_LE_HIX22; 794 return (FIX_RELOC); 795 796 case R_SPARC_TLS_LDO_LOX10: 797 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 798 R_SPARC_TLS_LE_LOX10, arsp)); 799 arsp->rel_rtype = R_SPARC_TLS_LE_LOX10; 800 return (FIX_RELOC); 801 802 case R_SPARC_TLS_IE_LO10: 803 case R_SPARC_TLS_GD_LO10: 804 /* 805 * Current instruction is: 806 * 807 * or r1, %lo(x), r2 808 * or 809 * add r1, %lo(x), r2 810 * 811 * 812 * Need to udpate this to: 813 * 814 * xor r1, %lox(x), r2 815 */ 816 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 817 R_SPARC_TLS_LE_LOX10, arsp)); 818 *offset = TLS_GD_LE_XOR | 819 (*offset & (FM3_REG_MSK_RS1 | FM3_REG_MSK_RD)); 820 arsp->rel_rtype = R_SPARC_TLS_LE_LOX10; 821 return (FIX_RELOC); 822 823 case R_SPARC_TLS_IE_LD: 824 case R_SPARC_TLS_IE_LDX: 825 /* 826 * Current instruction: 827 * ld{x} [r1 + r2], r3 828 * 829 * Need to update this to: 830 * 831 * mov r2, r3 (or %g0, r2, r3) 832 */ 833 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 834 R_SPARC_NONE, arsp)); 835 *offset = ((*offset) & (FM3_REG_MSK_RS2 | FM3_REG_MSK_RD)) | 836 TLS_IE_LE_OR; 837 return (FIX_DONE); 838 839 case R_SPARC_TLS_LDO_ADD: 840 case R_SPARC_TLS_GD_ADD: 841 /* 842 * Current instruction is: 843 * 844 * add gptr_reg, r2, r3 845 * 846 * Need to updated this to: 847 * 848 * add %g7, r2, r3 849 */ 850 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 851 R_SPARC_NONE, arsp)); 852 *offset = *offset & (~FM3_REG_MSK_RS1); 853 *offset = *offset | (REG_G7 << 14); 854 return (FIX_DONE); 855 856 case R_SPARC_TLS_LDM_CALL: 857 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 858 R_SPARC_NONE, arsp)); 859 *offset = TLS_LD_LE_CLRO0; 860 return (FIX_DONE); 861 862 case R_SPARC_TLS_LDM_HI22: 863 case R_SPARC_TLS_LDM_LO10: 864 case R_SPARC_TLS_LDM_ADD: 865 case R_SPARC_TLS_IE_ADD: 866 case R_SPARC_TLS_GD_CALL: 867 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 868 R_SPARC_NONE, arsp)); 869 *offset = M_NOP; 870 return (FIX_DONE); 871 } 872 return (FIX_RELOC); 873 } 874 875 #define GOTOP_ADDINST 0x80000000 /* add %g0, %g0, %g0 */ 876 877 static Fixupret 878 gotop_fixups(Ofl_desc *ofl, Rel_desc *arsp) 879 { 880 Word rtype = arsp->rel_rtype; 881 uint_t *offset; 882 const char *ifl_name; 883 Conv_inv_buf_t inv_buf; 884 885 switch (rtype) { 886 case R_SPARC_GOTDATA_OP_HIX22: 887 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 888 R_SPARC_GOTDATA_HIX22, arsp)); 889 arsp->rel_rtype = R_SPARC_GOTDATA_HIX22; 890 return (FIX_RELOC); 891 892 case R_SPARC_GOTDATA_OP_LOX10: 893 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 894 R_SPARC_GOTDATA_LOX10, arsp)); 895 arsp->rel_rtype = R_SPARC_GOTDATA_LOX10; 896 return (FIX_RELOC); 897 898 case R_SPARC_GOTDATA_OP: 899 /* 900 * Current instruction: 901 * ld{x} [r1 + r2], r3 902 * 903 * Need to update this to: 904 * 905 * add r1, r2, r3 906 */ 907 DBG_CALL(Dbg_reloc_transition(ofl->ofl_lml, M_MACH, 908 R_SPARC_NONE, arsp)); 909 offset = (uint_t *)(uintptr_t)(arsp->rel_roffset + 910 _elf_getxoff(arsp->rel_isdesc->is_indata) + 911 (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf); 912 913 *offset = ((*offset) & (FM3_REG_MSK_RS1 | 914 FM3_REG_MSK_RS2 | FM3_REG_MSK_RD)) | GOTOP_ADDINST; 915 return (FIX_DONE); 916 } 917 /* 918 * We should not get here 919 */ 920 if (arsp->rel_isdesc->is_file) 921 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 922 else 923 ifl_name = MSG_INTL(MSG_STR_NULL); 924 925 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_BADGOTFIX), 926 conv_reloc_SPARC_type(arsp->rel_rtype, 0, &inv_buf), 927 ifl_name, demangle(arsp->rel_sname)); 928 929 assert(0); 930 return (FIX_ERROR); 931 } 932 933 uintptr_t 934 ld_do_activerelocs(Ofl_desc *ofl) 935 { 936 Rel_desc *arsp; 937 Rel_cache *rcp; 938 Listnode *lnp; 939 uintptr_t return_code = 1; 940 Word flags = ofl->ofl_flags; 941 942 if (ofl->ofl_actrels.head) 943 DBG_CALL(Dbg_reloc_doact_title(ofl->ofl_lml)); 944 945 /* 946 * Process active relocations. 947 */ 948 for (LIST_TRAVERSE(&ofl->ofl_actrels, lnp, rcp)) { 949 /* LINTED */ 950 for (arsp = (Rel_desc *)(rcp + 1); 951 arsp < rcp->rc_free; arsp++) { 952 uchar_t *addr; 953 Xword value; 954 Sym_desc *sdp; 955 const char *ifl_name; 956 Xword refaddr; 957 958 /* 959 * If the section this relocation is against has been 960 * discarded (-zignore), then discard (skip) the 961 * relocation itself. 962 */ 963 if ((arsp->rel_isdesc->is_flags & FLG_IS_DISCARD) && 964 ((arsp->rel_flags & 965 (FLG_REL_GOT | FLG_REL_BSS | 966 FLG_REL_PLT | FLG_REL_NOINFO)) == 0)) { 967 DBG_CALL(Dbg_reloc_discard(ofl->ofl_lml, 968 M_MACH, arsp)); 969 continue; 970 } 971 972 /* 973 * Perform any required TLS fixups. 974 */ 975 if (arsp->rel_flags & FLG_REL_TLSFIX) { 976 Fixupret ret; 977 978 if ((ret = tls_fixups(ofl, arsp)) == FIX_ERROR) 979 return (S_ERROR); 980 if (ret == FIX_DONE) 981 continue; 982 } 983 984 /* 985 * Perform any required GOTOP fixups. 986 */ 987 if (arsp->rel_flags & FLG_REL_GOTFIX) { 988 Fixupret ret; 989 990 if ((ret = 991 gotop_fixups(ofl, arsp)) == FIX_ERROR) 992 return (S_ERROR); 993 if (ret == FIX_DONE) 994 continue; 995 } 996 997 /* 998 * If this is a relocation against the move table, or 999 * expanded move table, adjust the relocation entries. 1000 */ 1001 if (arsp->rel_move) 1002 ld_adj_movereloc(ofl, arsp); 1003 1004 sdp = arsp->rel_sym; 1005 refaddr = arsp->rel_roffset + 1006 (Off)_elf_getxoff(arsp->rel_isdesc->is_indata); 1007 1008 if ((arsp->rel_flags & FLG_REL_CLVAL) || 1009 (arsp->rel_flags & FLG_REL_GOTCL)) 1010 value = 0; 1011 else if (ELF_ST_TYPE(sdp->sd_sym->st_info) == 1012 STT_SECTION) { 1013 Sym_desc *sym; 1014 1015 /* 1016 * The value for a symbol pointing to a SECTION 1017 * is based off of that sections position. 1018 */ 1019 if ((sdp->sd_isc->is_flags & FLG_IS_RELUPD) && 1020 (sym = ld_am_I_partial(arsp, 1021 arsp->rel_roffset))) { 1022 /* 1023 * If the symbol is moved, 1024 * adjust the value 1025 */ 1026 value = _elf_getxoff( 1027 sym->sd_isc->is_indata); 1028 if (sym->sd_isc->is_shdr->sh_flags & 1029 SHF_ALLOC) 1030 value += sym->sd_isc-> 1031 is_osdesc->os_shdr->sh_addr; 1032 } else { 1033 value = _elf_getxoff( 1034 sdp->sd_isc->is_indata); 1035 if (sdp->sd_isc->is_shdr->sh_flags & 1036 SHF_ALLOC) 1037 value += sdp->sd_isc-> 1038 is_osdesc->os_shdr->sh_addr; 1039 } 1040 1041 if (sdp->sd_isc->is_shdr->sh_flags & SHF_TLS) 1042 value -= ofl->ofl_tlsphdr->p_vaddr; 1043 1044 } else if (IS_SIZE(arsp->rel_rtype)) { 1045 /* 1046 * Size relocations require the symbols size. 1047 */ 1048 value = sdp->sd_sym->st_size; 1049 } else { 1050 /* 1051 * Else the value is the symbols value. 1052 */ 1053 value = sdp->sd_sym->st_value; 1054 } 1055 1056 /* 1057 * Relocation against the GLOBAL_OFFSET_TABLE. 1058 */ 1059 if (arsp->rel_flags & FLG_REL_GOT) 1060 arsp->rel_osdesc = ofl->ofl_osgot; 1061 1062 /* 1063 * If loadable and not producing a relocatable object 1064 * add the sections virtual address to the reference 1065 * address. 1066 */ 1067 if ((arsp->rel_flags & FLG_REL_LOAD) && 1068 ((flags & FLG_OF_RELOBJ) == 0)) 1069 refaddr += arsp->rel_isdesc->is_osdesc-> 1070 os_shdr->sh_addr; 1071 1072 /* 1073 * If this entry has a PLT assigned to it, it's 1074 * value is actually the address of the PLT (and 1075 * not the address of the function). 1076 */ 1077 if (IS_PLT(arsp->rel_rtype)) { 1078 if (sdp->sd_aux && sdp->sd_aux->sa_PLTndx) 1079 value = ld_calc_plt_addr(sdp, ofl); 1080 } 1081 1082 /* 1083 * Add relocations addend to value. Add extra 1084 * relocation addend if needed. 1085 */ 1086 value += arsp->rel_raddend; 1087 if (IS_EXTOFFSET(arsp->rel_rtype)) 1088 value += arsp->rel_typedata; 1089 1090 /* 1091 * Determine whether the value needs further adjustment. 1092 * Filter through the attributes of the relocation to 1093 * determine what adjustment is required. Note, many 1094 * of the following cases are only applicable when a 1095 * .got is present. As a .got is not generated when a 1096 * relocatable object is being built, any adjustments 1097 * that require a .got need to be skipped. 1098 */ 1099 if ((arsp->rel_flags & FLG_REL_GOT) && 1100 ((flags & FLG_OF_RELOBJ) == 0)) { 1101 Xword R1addr; 1102 uintptr_t R2addr; 1103 Sword gotndx; 1104 Gotndx *gnp; 1105 Gotref gref; 1106 1107 /* 1108 * Clear the GOT table entry, on SPARC we clear 1109 * the entry and the 'value' if needed is stored 1110 * in an output relocations addend. 1111 * 1112 * Calculate offset into GOT at which to apply 1113 * the relocation. 1114 */ 1115 if (arsp->rel_flags & FLG_REL_DTLS) 1116 gref = GOT_REF_TLSGD; 1117 else if (arsp->rel_flags & FLG_REL_MTLS) 1118 gref = GOT_REF_TLSLD; 1119 else if (arsp->rel_flags & FLG_REL_STLS) 1120 gref = GOT_REF_TLSIE; 1121 else 1122 gref = GOT_REF_GENERIC; 1123 1124 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 1125 ofl, arsp); 1126 assert(gnp); 1127 1128 if (arsp->rel_rtype == M_R_DTPOFF) 1129 gotndx = gnp->gn_gotndx + 1; 1130 else 1131 gotndx = gnp->gn_gotndx; 1132 1133 /* LINTED */ 1134 R1addr = (Xword)((-neggotoffset * 1135 M_GOT_ENTSIZE) + (gotndx * M_GOT_ENTSIZE)); 1136 1137 /* 1138 * Add the GOTs data's offset. 1139 */ 1140 R2addr = R1addr + (uintptr_t) 1141 arsp->rel_osdesc->os_outdata->d_buf; 1142 1143 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, 1144 ELF_DBG_LD, M_MACH, SHT_RELA, 1145 arsp->rel_rtype, R1addr, value, 1146 arsp->rel_sname, arsp->rel_osdesc)); 1147 1148 /* 1149 * And do it. 1150 */ 1151 if (ofl->ofl_flags1 & FLG_OF1_ENCDIFF) 1152 *(Xword *)R2addr = 1153 ld_byteswap_Xword(value); 1154 else 1155 *(Xword *)R2addr = value; 1156 continue; 1157 1158 } else if (IS_GOT_BASED(arsp->rel_rtype) && 1159 ((flags & FLG_OF_RELOBJ) == 0)) { 1160 value -= (ofl->ofl_osgot->os_shdr->sh_addr + 1161 (-neggotoffset * M_GOT_ENTSIZE)); 1162 1163 } else if (IS_PC_RELATIVE(arsp->rel_rtype)) { 1164 value -= refaddr; 1165 1166 } else if (IS_TLS_INS(arsp->rel_rtype) && 1167 IS_GOT_RELATIVE(arsp->rel_rtype) && 1168 ((flags & FLG_OF_RELOBJ) == 0)) { 1169 Gotndx *gnp; 1170 Gotref gref; 1171 1172 if (arsp->rel_flags & FLG_REL_STLS) 1173 gref = GOT_REF_TLSIE; 1174 else if (arsp->rel_flags & FLG_REL_DTLS) 1175 gref = GOT_REF_TLSGD; 1176 else if (arsp->rel_flags & FLG_REL_MTLS) 1177 gref = GOT_REF_TLSLD; 1178 1179 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, 1180 ofl, arsp); 1181 assert(gnp); 1182 1183 value = gnp->gn_gotndx * M_GOT_ENTSIZE; 1184 1185 } else if (IS_GOT_RELATIVE(arsp->rel_rtype) && 1186 ((flags & FLG_OF_RELOBJ) == 0)) { 1187 Gotndx *gnp; 1188 1189 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1190 GOT_REF_GENERIC, ofl, arsp); 1191 assert(gnp); 1192 1193 value = gnp->gn_gotndx * M_GOT_ENTSIZE; 1194 1195 } else if ((arsp->rel_flags & FLG_REL_STLS) && 1196 ((flags & FLG_OF_RELOBJ) == 0)) { 1197 Xword tlsstatsize; 1198 1199 /* 1200 * This is the LE TLS 1201 * reference model. Static offset 1202 * is hard-coded, and negated so that 1203 * it can be added to the thread pointer (%g7) 1204 */ 1205 tlsstatsize = S_ROUND(ofl-> 1206 ofl_tlsphdr->p_memsz, M_TLSSTATALIGN); 1207 value = -(tlsstatsize - value); 1208 } 1209 1210 if (arsp->rel_isdesc->is_file) 1211 ifl_name = arsp->rel_isdesc->is_file->ifl_name; 1212 else 1213 ifl_name = MSG_INTL(MSG_STR_NULL); 1214 1215 /* 1216 * Make sure we have data to relocate. Compiler and 1217 * assembler developers have been known to generate 1218 * relocations against invalid sections (normally .bss), 1219 * so for their benefit give them sufficient information 1220 * to help analyze the problem. End users should never 1221 * see this. 1222 */ 1223 if (arsp->rel_isdesc->is_indata->d_buf == 0) { 1224 Conv_inv_buf_t inv_buf; 1225 1226 eprintf(ofl->ofl_lml, ERR_FATAL, 1227 MSG_INTL(MSG_REL_EMPTYSEC), 1228 conv_reloc_SPARC_type(arsp->rel_rtype, 1229 0, &inv_buf), ifl_name, 1230 demangle(arsp->rel_sname), 1231 arsp->rel_isdesc->is_name); 1232 return (S_ERROR); 1233 } 1234 1235 /* 1236 * Get the address of the data item we need to modify. 1237 */ 1238 addr = (uchar_t *)((uintptr_t)arsp->rel_roffset + 1239 (uintptr_t)_elf_getxoff(arsp->rel_isdesc-> 1240 is_indata)); 1241 1242 /*LINTED*/ 1243 DBG_CALL(Dbg_reloc_doact(ofl->ofl_lml, ELF_DBG_LD, 1244 M_MACH, SHT_RELA, arsp->rel_rtype, EC_NATPTR(addr), 1245 value, arsp->rel_sname, arsp->rel_osdesc)); 1246 addr += (uintptr_t)arsp->rel_osdesc->os_outdata->d_buf; 1247 1248 if ((((uintptr_t)addr - (uintptr_t)ofl->ofl_nehdr) > 1249 ofl->ofl_size) || (arsp->rel_roffset > 1250 arsp->rel_osdesc->os_shdr->sh_size)) { 1251 Conv_inv_buf_t inv_buf; 1252 int class; 1253 1254 if (((uintptr_t)addr - 1255 (uintptr_t)ofl->ofl_nehdr) > ofl->ofl_size) 1256 class = ERR_FATAL; 1257 else 1258 class = ERR_WARNING; 1259 1260 eprintf(ofl->ofl_lml, class, 1261 MSG_INTL(MSG_REL_INVALOFFSET), 1262 conv_reloc_SPARC_type(arsp->rel_rtype, 1263 0, &inv_buf), ifl_name, 1264 arsp->rel_isdesc->is_name, 1265 demangle(arsp->rel_sname), 1266 EC_ADDR((uintptr_t)addr - 1267 (uintptr_t)ofl->ofl_nehdr)); 1268 1269 if (class == ERR_FATAL) { 1270 return_code = S_ERROR; 1271 continue; 1272 } 1273 } 1274 1275 /* 1276 * If '-z noreloc' is specified - skip the do_reloc 1277 * stage. 1278 */ 1279 if (OFL_DO_RELOC(ofl)) { 1280 if (do_reloc_ld((uchar_t)arsp->rel_rtype, addr, 1281 &value, arsp->rel_sname, ifl_name, 1282 OFL_SWAP_RELOC_DATA(ofl, arsp), 1283 ofl->ofl_lml) == 0) 1284 return_code = S_ERROR; 1285 } 1286 } 1287 } 1288 return (return_code); 1289 } 1290 1291 uintptr_t 1292 ld_add_outrel(Word flags, Rel_desc *rsp, Ofl_desc *ofl) 1293 { 1294 Rel_desc *orsp; 1295 Rel_cache *rcp; 1296 Sym_desc *sdp = rsp->rel_sym; 1297 Conv_inv_buf_t inv_buf; 1298 1299 /* 1300 * Static executables *do not* want any relocations against them. 1301 * Since our engine still creates relocations against a WEAK UNDEFINED 1302 * symbol in a static executable, it's best to disable them here 1303 * instead of through out the relocation code. 1304 */ 1305 if ((ofl->ofl_flags & (FLG_OF_STATIC | FLG_OF_EXEC)) == 1306 (FLG_OF_STATIC | FLG_OF_EXEC)) 1307 return (1); 1308 1309 /* 1310 * Certain relocations do not make sense in a 64bit shared object, 1311 * if building a shared object do a sanity check on the output 1312 * relocations being created. 1313 */ 1314 if (ofl->ofl_flags & FLG_OF_SHAROBJ) { 1315 Word rtype = rsp->rel_rtype; 1316 /* 1317 * Because the R_SPARC_HIPLT22 & R_SPARC_LOPLT10 relocations 1318 * are not relative they make no sense to create in a shared 1319 * object - so emit the proper error message if that occurs. 1320 */ 1321 if ((rtype == R_SPARC_HIPLT22) || (rtype == R_SPARC_LOPLT10)) { 1322 eprintf(ofl->ofl_lml, ERR_FATAL, 1323 MSG_INTL(MSG_REL_UNRELREL), 1324 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1325 rsp->rel_isdesc->is_file->ifl_name, 1326 demangle(rsp->rel_sname)); 1327 return (S_ERROR); 1328 } 1329 #if defined(_ELF64) 1330 /* 1331 * Each of the following relocations requires that the 1332 * object being built be loaded in either the upper 32 or 1333 * 44 bit range of memory. Since shared libraries traditionally 1334 * are loaded in the lower range of memory - this isn't going 1335 * to work. 1336 */ 1337 if ((rtype == R_SPARC_H44) || (rtype == R_SPARC_M44) || 1338 (rtype == R_SPARC_L44)) { 1339 eprintf(ofl->ofl_lml, ERR_FATAL, 1340 MSG_INTL(MSG_REL_SHOBJABS44), 1341 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1342 rsp->rel_isdesc->is_file->ifl_name, 1343 demangle(rsp->rel_sname)); 1344 return (S_ERROR); 1345 } 1346 #endif 1347 } 1348 1349 /* 1350 * If no relocation cache structures are available allocate 1351 * a new one and link it into the cache list. 1352 */ 1353 if ((ofl->ofl_outrels.tail == 0) || 1354 ((rcp = (Rel_cache *)ofl->ofl_outrels.tail->data) == 0) || 1355 ((orsp = rcp->rc_free) == rcp->rc_end)) { 1356 static size_t nextsize = 0; 1357 size_t size; 1358 1359 /* 1360 * Output relocation numbers can vary considerably between 1361 * building executables or shared objects (pic vs. non-pic), 1362 * etc. But, they typically aren't very large, so for these 1363 * objects use a standard bucket size. For building relocatable 1364 * objects, typically there will be an output relocation for 1365 * every input relocation. 1366 */ 1367 if (nextsize == 0) { 1368 if (ofl->ofl_flags & FLG_OF_RELOBJ) { 1369 if ((size = ofl->ofl_relocincnt) == 0) 1370 size = REL_LOIDESCNO; 1371 if (size > REL_HOIDESCNO) 1372 nextsize = REL_HOIDESCNO; 1373 else 1374 nextsize = REL_LOIDESCNO; 1375 } else 1376 nextsize = size = REL_HOIDESCNO; 1377 } else 1378 size = nextsize; 1379 1380 size = size * sizeof (Rel_desc); 1381 1382 if (((rcp = libld_malloc(sizeof (Rel_cache) + size)) == 0) || 1383 (list_appendc(&ofl->ofl_outrels, rcp) == 0)) 1384 return (S_ERROR); 1385 1386 /* LINTED */ 1387 rcp->rc_free = orsp = (Rel_desc *)(rcp + 1); 1388 /* LINTED */ 1389 rcp->rc_end = (Rel_desc *)((char *)rcp->rc_free + size); 1390 } 1391 1392 1393 /* 1394 * If we are adding a output relocation against a section 1395 * symbol (non-RELATIVE) then mark that section. These sections 1396 * will be added to the .dynsym symbol table. 1397 */ 1398 if (sdp && (rsp->rel_rtype != M_R_RELATIVE) && 1399 ((flags & FLG_REL_SCNNDX) || 1400 (ELF_ST_TYPE(sdp->sd_sym->st_info) == STT_SECTION))) { 1401 1402 /* 1403 * If this is a COMMON symbol - no output section 1404 * exists yet - (it's created as part of sym_validate()). 1405 * So - we mark here that when it's created it should 1406 * be tagged with the FLG_OS_OUTREL flag. 1407 */ 1408 if ((sdp->sd_flags & FLG_SY_SPECSEC) && 1409 (sdp->sd_sym->st_shndx == SHN_COMMON)) { 1410 if (ELF_ST_TYPE(sdp->sd_sym->st_info) != STT_TLS) 1411 ofl->ofl_flags1 |= FLG_OF1_BSSOREL; 1412 else 1413 ofl->ofl_flags1 |= FLG_OF1_TLSOREL; 1414 } else { 1415 Os_desc *osp = sdp->sd_isc->is_osdesc; 1416 1417 if (osp && ((osp->os_flags & FLG_OS_OUTREL) == 0)) { 1418 ofl->ofl_dynshdrcnt++; 1419 osp->os_flags |= FLG_OS_OUTREL; 1420 } 1421 } 1422 } 1423 1424 *orsp = *rsp; 1425 orsp->rel_flags |= flags; 1426 1427 rcp->rc_free++; 1428 ofl->ofl_outrelscnt++; 1429 1430 if (flags & FLG_REL_GOT) 1431 ofl->ofl_relocgotsz += (Xword)sizeof (Rela); 1432 else if (flags & FLG_REL_PLT) 1433 ofl->ofl_relocpltsz += (Xword)sizeof (Rela); 1434 else if (flags & FLG_REL_BSS) 1435 ofl->ofl_relocbsssz += (Xword)sizeof (Rela); 1436 else if (flags & FLG_REL_NOINFO) 1437 ofl->ofl_relocrelsz += (Xword)sizeof (Rela); 1438 else 1439 orsp->rel_osdesc->os_szoutrels += (Xword)sizeof (Rela); 1440 1441 if (orsp->rel_rtype == M_R_RELATIVE) 1442 ofl->ofl_relocrelcnt++; 1443 1444 #if defined(_ELF64) 1445 /* 1446 * When building a 64-bit object any R_SPARC_WDISP30 relocation is given 1447 * a plt padding entry, unless we're building a relocatable object 1448 * (ld -r) or -b is in effect. 1449 */ 1450 if ((orsp->rel_rtype == R_SPARC_WDISP30) && 1451 ((ofl->ofl_flags & (FLG_OF_BFLAG | FLG_OF_RELOBJ)) == 0) && 1452 ((orsp->rel_sym->sd_flags & FLG_SY_PLTPAD) == 0)) { 1453 ofl->ofl_pltpad++; 1454 orsp->rel_sym->sd_flags |= FLG_SY_PLTPAD; 1455 } 1456 #endif 1457 /* 1458 * We don't perform sorting on PLT relocations because 1459 * they have already been assigned a PLT index and if we 1460 * were to sort them we would have to re-assign the plt indexes. 1461 */ 1462 if (!(flags & FLG_REL_PLT)) 1463 ofl->ofl_reloccnt++; 1464 1465 /* 1466 * Insure a GLOBAL_OFFSET_TABLE is generated if required. 1467 */ 1468 if (IS_GOT_REQUIRED(orsp->rel_rtype)) 1469 ofl->ofl_flags |= FLG_OF_BLDGOT; 1470 1471 /* 1472 * Identify and possibly warn of a displacement relocation. 1473 */ 1474 if (orsp->rel_flags & FLG_REL_DISP) { 1475 ofl->ofl_dtflags_1 |= DF_1_DISPRELPND; 1476 1477 if (ofl->ofl_flags & FLG_OF_VERBOSE) 1478 ld_disp_errmsg(MSG_INTL(MSG_REL_DISPREL4), orsp, ofl); 1479 } 1480 DBG_CALL(Dbg_reloc_ors_entry(ofl->ofl_lml, ELF_DBG_LD, SHT_RELA, 1481 M_MACH, orsp)); 1482 return (1); 1483 } 1484 1485 /* 1486 * Process relocation against a register symbol. Note, of -z muldefs is in 1487 * effect there may have been multiple register definitions, which would have 1488 * been processed as non-fatal, with the first definition winning. But, we 1489 * will also process multiple relocations for these multiple definitions. In 1490 * this case we must only preserve the relocation for the definition that was 1491 * kept. The sad part is that register relocations don't typically specify 1492 * the register symbol with which they are associated, so we might have to 1493 * search the input files global symbols to determine if this relocation is 1494 * appropriate. 1495 */ 1496 uintptr_t 1497 ld_reloc_register(Rel_desc * rsp, Is_desc * isp, Ofl_desc * ofl) 1498 { 1499 if (ofl->ofl_flags & FLG_OF_MULDEFS) { 1500 Ifl_desc * ifl = isp->is_file; 1501 Sym_desc * sdp = rsp->rel_sym; 1502 1503 if (sdp == 0) { 1504 Xword offset = rsp->rel_roffset; 1505 Word ndx; 1506 1507 for (ndx = ifl->ifl_locscnt; 1508 ndx < ifl->ifl_symscnt; ndx++) { 1509 if (((sdp = ifl->ifl_oldndx[ndx]) != 0) && 1510 (sdp->sd_flags & FLG_SY_REGSYM) && 1511 (sdp->sd_sym->st_value == offset)) 1512 break; 1513 } 1514 } 1515 if (sdp && (sdp->sd_file != ifl)) 1516 return (1); 1517 } 1518 return (ld_add_outrel((rsp->rel_flags | FLG_REL_REG), rsp, ofl)); 1519 } 1520 1521 /* 1522 * process relocation for a LOCAL symbol 1523 */ 1524 uintptr_t 1525 ld_reloc_local(Rel_desc * rsp, Ofl_desc * ofl) 1526 { 1527 Word flags = ofl->ofl_flags; 1528 Sym_desc *sdp = rsp->rel_sym; 1529 Word shndx = sdp->sd_sym->st_shndx; 1530 1531 /* 1532 * if ((shared object) and (not pc relative relocation) and 1533 * (not against ABS symbol)) 1534 * then 1535 * if (rtype != R_SPARC_32) 1536 * then 1537 * build relocation against section 1538 * else 1539 * build R_SPARC_RELATIVE 1540 * fi 1541 * fi 1542 */ 1543 if ((flags & FLG_OF_SHAROBJ) && (rsp->rel_flags & FLG_REL_LOAD) && 1544 !(IS_PC_RELATIVE(rsp->rel_rtype)) && !(IS_SIZE(rsp->rel_rtype)) && 1545 !(IS_GOT_BASED(rsp->rel_rtype)) && 1546 !(rsp->rel_isdesc != NULL && 1547 (rsp->rel_isdesc->is_shdr->sh_type == SHT_SUNW_dof)) && 1548 (((sdp->sd_flags & FLG_SY_SPECSEC) == 0) || 1549 (shndx != SHN_ABS) || (sdp->sd_aux && sdp->sd_aux->sa_symspec))) { 1550 Word ortype = rsp->rel_rtype; 1551 1552 if ((rsp->rel_rtype != R_SPARC_32) && 1553 (rsp->rel_rtype != R_SPARC_PLT32) && 1554 (rsp->rel_rtype != R_SPARC_64)) 1555 return (ld_add_outrel((FLG_REL_SCNNDX | FLG_REL_ADVAL), 1556 rsp, ofl)); 1557 1558 rsp->rel_rtype = R_SPARC_RELATIVE; 1559 if (ld_add_outrel(FLG_REL_ADVAL, rsp, ofl) == S_ERROR) 1560 return (S_ERROR); 1561 rsp->rel_rtype = ortype; 1562 return (1); 1563 } 1564 1565 /* 1566 * If the relocation is against a 'non-allocatable' section 1567 * and we can not resolve it now - then give a warning 1568 * message. 1569 * 1570 * We can not resolve the symbol if either: 1571 * a) it's undefined 1572 * b) it's defined in a shared library and a 1573 * COPY relocation hasn't moved it to the executable 1574 * 1575 * Note: because we process all of the relocations against the 1576 * text segment before any others - we know whether 1577 * or not a copy relocation will be generated before 1578 * we get here (see reloc_init()->reloc_segments()). 1579 */ 1580 if (!(rsp->rel_flags & FLG_REL_LOAD) && 1581 ((shndx == SHN_UNDEF) || 1582 ((sdp->sd_ref == REF_DYN_NEED) && 1583 ((sdp->sd_flags & FLG_SY_MVTOCOMM) == 0)))) { 1584 Conv_inv_buf_t inv_buf; 1585 1586 /* 1587 * If the relocation is against a SHT_SUNW_ANNOTATE 1588 * section - then silently ignore that the relocation 1589 * can not be resolved. 1590 */ 1591 if (rsp->rel_osdesc && 1592 (rsp->rel_osdesc->os_shdr->sh_type == SHT_SUNW_ANNOTATE)) 1593 return (0); 1594 (void) eprintf(ofl->ofl_lml, ERR_WARNING, 1595 MSG_INTL(MSG_REL_EXTERNSYM), 1596 conv_reloc_SPARC_type(rsp->rel_rtype, 0, &inv_buf), 1597 rsp->rel_isdesc->is_file->ifl_name, 1598 demangle(rsp->rel_sname), rsp->rel_osdesc->os_name); 1599 return (1); 1600 } 1601 1602 /* 1603 * Perform relocation. 1604 */ 1605 return (ld_add_actrel(NULL, rsp, ofl)); 1606 } 1607 1608 /* 1609 * Establish a relocation transition. Note, at this point of input relocation 1610 * processing, we have no idea of the relocation value that will be used in 1611 * the eventual relocation calculation. This value is only known after the 1612 * initial image has been constructed. Therefore, there is a small chance 1613 * that a value can exceed the capabilities of the transitioned relocation. 1614 * One example might be the offset from the GOT to a symbol. 1615 * 1616 * The only instance of this failure discovered so far has been via the use of 1617 * ABS symbols to represent an external memory location. This situation is 1618 * rare, since ABS symbols aren't typically generated by the compilers. 1619 * Therefore, our solution is to excluded ABS symbols from the transition 1620 * relocation possibilities. As an additional safeguard, if an inappropriate 1621 * value is passed to the final relocation engine, a verification ("V") 1622 * relocation should trigger a fatal error condition. 1623 */ 1624 uintptr_t 1625 ld_reloc_GOTOP(Boolean local, Rel_desc *rsp, Ofl_desc *ofl) 1626 { 1627 Word rtype = rsp->rel_rtype; 1628 1629 if (!local || (rsp->rel_sym->sd_sym->st_shndx == SHN_ABS)) { 1630 /* 1631 * When binding to a external symbol, no fixups are required 1632 * and the GOTDATA_OP relocation can be ignored. 1633 */ 1634 if (rtype == R_SPARC_GOTDATA_OP) 1635 return (1); 1636 return (ld_reloc_GOT_relative(local, rsp, ofl)); 1637 } 1638 1639 /* 1640 * When binding to a local symbol the relocations can be transitioned: 1641 * 1642 * R_*_GOTDATA_OP_HIX22 -> R_*_GOTDATA_HIX22 1643 * R_*_GOTDATA_OP_LOX10 -> R_*_GOTDATA_LOX10 1644 * R_*_GOTDATA_OP -> instruction fixup 1645 */ 1646 return (ld_add_actrel(FLG_REL_GOTFIX, rsp, ofl)); 1647 } 1648 1649 uintptr_t 1650 ld_reloc_TLS(Boolean local, Rel_desc *rsp, Ofl_desc *ofl) 1651 { 1652 Word rtype = rsp->rel_rtype; 1653 Sym_desc *sdp = rsp->rel_sym; 1654 Word flags = ofl->ofl_flags; 1655 Gotndx *gnp; 1656 1657 /* 1658 * If we're building an executable - use either the IE or LE access 1659 * model. If we're building a shared object process any IE model. 1660 */ 1661 if ((flags & FLG_OF_EXEC) || (IS_TLS_IE(rtype))) { 1662 /* 1663 * Set the DF_STATIC_TLS flag. 1664 */ 1665 ofl->ofl_dtflags |= DF_STATIC_TLS; 1666 1667 if (!local || ((flags & FLG_OF_EXEC) == 0)) { 1668 /* 1669 * When processing static TLS - these relocations 1670 * can be ignored. 1671 */ 1672 if ((rtype == R_SPARC_TLS_IE_LD) || 1673 (rtype == R_SPARC_TLS_IE_LDX) || 1674 (rtype == R_SPARC_TLS_IE_ADD)) 1675 return (1); 1676 1677 /* 1678 * Assign a GOT entry for IE static TLS references. 1679 */ 1680 if (((rtype == R_SPARC_TLS_GD_HI22) || 1681 (rtype == R_SPARC_TLS_GD_LO10) || 1682 (rtype == R_SPARC_TLS_IE_HI22) || 1683 (rtype == R_SPARC_TLS_IE_LO10)) && 1684 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), 1685 GOT_REF_TLSIE, ofl, rsp)) == 0)) { 1686 1687 if (ld_assign_got_TLS(local, rsp, ofl, sdp, 1688 gnp, GOT_REF_TLSIE, FLG_REL_STLS, 1689 rtype, M_R_TPOFF, 0) == S_ERROR) 1690 return (S_ERROR); 1691 } 1692 1693 /* 1694 * IE access model. 1695 */ 1696 if (IS_TLS_IE(rtype)) 1697 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1698 1699 /* 1700 * Fixups are required for other executable models. 1701 */ 1702 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1703 rsp, ofl)); 1704 } 1705 1706 /* 1707 * LE access model. 1708 */ 1709 if (IS_TLS_LE(rtype)) 1710 return (ld_add_actrel(FLG_REL_STLS, rsp, ofl)); 1711 1712 /* 1713 * When processing static TLS - these relocations can be 1714 * ignored. 1715 */ 1716 if (rtype == R_SPARC_TLS_IE_ADD) 1717 return (1); 1718 1719 return (ld_add_actrel((FLG_REL_TLSFIX | FLG_REL_STLS), 1720 rsp, ofl)); 1721 } 1722 1723 /* 1724 * Building a shared object. 1725 * 1726 * For dynamic TLS references, ADD relocations are ignored. 1727 */ 1728 if ((rtype == R_SPARC_TLS_GD_ADD) || (rtype == R_SPARC_TLS_LDM_ADD) || 1729 (rtype == R_SPARC_TLS_LDO_ADD)) 1730 return (1); 1731 1732 /* 1733 * Assign a GOT entry for a dynamic TLS reference. 1734 */ 1735 if (((rtype == R_SPARC_TLS_LDM_HI22) || 1736 (rtype == R_SPARC_TLS_LDM_LO10)) && 1737 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSLD, 1738 ofl, rsp)) == 0)) { 1739 1740 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSLD, 1741 FLG_REL_MTLS, rtype, M_R_DTPMOD, 0) == S_ERROR) 1742 return (S_ERROR); 1743 1744 } else if (((rtype == R_SPARC_TLS_GD_HI22) || 1745 (rtype == R_SPARC_TLS_GD_LO10)) && 1746 ((gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), GOT_REF_TLSGD, 1747 ofl, rsp)) == 0)) { 1748 1749 if (ld_assign_got_TLS(local, rsp, ofl, sdp, gnp, GOT_REF_TLSGD, 1750 FLG_REL_DTLS, rtype, M_R_DTPMOD, M_R_DTPOFF) == S_ERROR) 1751 return (S_ERROR); 1752 } 1753 1754 /* 1755 * For GD/LD TLS reference - TLS_{GD,LD}_CALL, this will eventually 1756 * cause a call to __tls_get_addr(). Convert this relocation to that 1757 * symbol now, and prepare for the PLT magic. 1758 */ 1759 if ((rtype == R_SPARC_TLS_GD_CALL) || (rtype == R_SPARC_TLS_LDM_CALL)) { 1760 Sym_desc *tlsgetsym; 1761 1762 if ((tlsgetsym = ld_sym_add_u(MSG_ORIG(MSG_SYM_TLSGETADDR_U), 1763 ofl, MSG_STR_TLSREL)) == (Sym_desc *)S_ERROR) 1764 return (S_ERROR); 1765 1766 rsp->rel_sym = tlsgetsym; 1767 rsp->rel_sname = tlsgetsym->sd_name; 1768 rsp->rel_rtype = R_SPARC_WPLT30; 1769 1770 if (ld_reloc_plt(rsp, ofl) == S_ERROR) 1771 return (S_ERROR); 1772 1773 rsp->rel_sym = sdp; 1774 rsp->rel_sname = sdp->sd_name; 1775 rsp->rel_rtype = rtype; 1776 return (1); 1777 } 1778 1779 if (IS_TLS_LD(rtype)) 1780 return (ld_add_actrel(FLG_REL_MTLS, rsp, ofl)); 1781 1782 return (ld_add_actrel(FLG_REL_DTLS, rsp, ofl)); 1783 } 1784 1785 /* 1786 * ld_allocate_got: if a GOT is to be made, after the section is built this 1787 * function is called to allocate all the GOT slots. The allocation is 1788 * deferred until after all GOTs have been counted and sorted according 1789 * to their size, for only then will we know how to allocate them on 1790 * a processor like SPARC which has different models for addressing the 1791 * GOT. SPARC has two: small and large, small uses a signed 13-bit offset 1792 * into the GOT, whereas large uses an unsigned 32-bit offset. 1793 */ 1794 static Sword small_index; /* starting index for small GOT entries */ 1795 static Sword mixed_index; /* starting index for mixed GOT entries */ 1796 static Sword large_index; /* starting index for large GOT entries */ 1797 1798 uintptr_t 1799 ld_assign_got(Ofl_desc *ofl, Sym_desc * sdp) 1800 { 1801 Listnode * lnp; 1802 Gotndx * gnp; 1803 1804 for (LIST_TRAVERSE(&sdp->sd_GOTndxs, lnp, gnp)) { 1805 uint_t gotents; 1806 Gotref gref; 1807 gref = gnp->gn_gotref; 1808 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1809 gotents = 2; 1810 else 1811 gotents = 1; 1812 1813 switch (gnp->gn_gotndx) { 1814 case M_GOT_SMALL: 1815 gnp->gn_gotndx = small_index; 1816 small_index += gotents; 1817 if (small_index == 0) 1818 small_index = M_GOT_XNumber; 1819 break; 1820 case M_GOT_MIXED: 1821 gnp->gn_gotndx = mixed_index; 1822 mixed_index += gotents; 1823 break; 1824 case M_GOT_LARGE: 1825 gnp->gn_gotndx = large_index; 1826 large_index += gotents; 1827 break; 1828 default: 1829 eprintf(ofl->ofl_lml, ERR_FATAL, 1830 MSG_INTL(MSG_REL_ASSIGNGOT), 1831 EC_XWORD(gnp->gn_gotndx), demangle(sdp->sd_name)); 1832 return (S_ERROR); 1833 } 1834 } 1835 return (1); 1836 } 1837 1838 /* 1839 * Search the GOT index list for a GOT entry with the proper addend. 1840 */ 1841 Gotndx * 1842 ld_find_gotndx(List * lst, Gotref gref, Ofl_desc * ofl, Rel_desc * rdesc) 1843 { 1844 Listnode * lnp; 1845 Gotndx * gnp; 1846 1847 if ((gref == GOT_REF_TLSLD) && ofl->ofl_tlsldgotndx) 1848 return (ofl->ofl_tlsldgotndx); 1849 1850 for (LIST_TRAVERSE(lst, lnp, gnp)) { 1851 if ((rdesc->rel_raddend == gnp->gn_addend) && 1852 (gref == gnp->gn_gotref)) 1853 return (gnp); 1854 } 1855 return ((Gotndx *)0); 1856 } 1857 1858 Xword 1859 ld_calc_got_offset(Rel_desc * rdesc, Ofl_desc * ofl) 1860 { 1861 Os_desc *osp = ofl->ofl_osgot; 1862 Sym_desc *sdp = rdesc->rel_sym; 1863 Xword gotndx; 1864 Gotref gref; 1865 Gotndx *gnp; 1866 1867 if (rdesc->rel_flags & FLG_REL_DTLS) 1868 gref = GOT_REF_TLSGD; 1869 else if (rdesc->rel_flags & FLG_REL_MTLS) 1870 gref = GOT_REF_TLSLD; 1871 else if (rdesc->rel_flags & FLG_REL_STLS) 1872 gref = GOT_REF_TLSIE; 1873 else 1874 gref = GOT_REF_GENERIC; 1875 1876 gnp = ld_find_gotndx(&(sdp->sd_GOTndxs), gref, ofl, rdesc); 1877 assert(gnp); 1878 1879 gotndx = (Xword)gnp->gn_gotndx; 1880 1881 if ((rdesc->rel_flags & FLG_REL_DTLS) && 1882 (rdesc->rel_rtype == M_R_DTPOFF)) 1883 gotndx++; 1884 1885 return ((Xword)((osp->os_shdr->sh_addr) + (gotndx * M_GOT_ENTSIZE) + 1886 (-neggotoffset * M_GOT_ENTSIZE))); 1887 } 1888 1889 uintptr_t 1890 ld_assign_got_ndx(List * lst, Gotndx * pgnp, Gotref gref, Ofl_desc * ofl, 1891 Rel_desc * rsp, Sym_desc * sdp) 1892 { 1893 Xword raddend; 1894 Gotndx * gnp, * _gnp; 1895 Listnode * lnp, * plnp; 1896 uint_t gotents; 1897 1898 /* Some TLS requires two relocations with two GOT entries */ 1899 if ((gref == GOT_REF_TLSGD) || (gref == GOT_REF_TLSLD)) 1900 gotents = 2; 1901 else 1902 gotents = 1; 1903 1904 raddend = rsp->rel_raddend; 1905 if (pgnp && (pgnp->gn_addend == raddend) && (pgnp->gn_gotref == gref)) { 1906 1907 /* 1908 * If an entry for this addend already exists, determine if it 1909 * has mixed mode GOT access (both PIC and pic). 1910 * 1911 * In order to be accessible by both large and small pic, 1912 * a mixed mode GOT must be located in the positive index 1913 * range above _GLOBAL_OFFSET_TABLE_, and in the range 1914 * reachable small pic. This is necessary because the large 1915 * PIC mode cannot use a negative offset. This implies that 1916 * there can be no more than (M_GOT_MAXSMALL/2 - M_GOT_XNumber) 1917 * such entries. 1918 */ 1919 switch (pgnp->gn_gotndx) { 1920 case M_GOT_SMALL: 1921 /* 1922 * This one was previously identified as a small 1923 * GOT. If this access is large, then convert 1924 * it to mixed. 1925 */ 1926 if (rsp->rel_rtype != R_SPARC_GOT13) { 1927 pgnp->gn_gotndx = M_GOT_MIXED; 1928 mixgotcnt += gotents; 1929 } 1930 break; 1931 1932 case M_GOT_LARGE: 1933 /* 1934 * This one was previously identified as a large 1935 * GOT. If this access is small, convert it to mixed. 1936 */ 1937 if (rsp->rel_rtype == R_SPARC_GOT13) { 1938 smlgotcnt += gotents; 1939 mixgotcnt += gotents; 1940 pgnp->gn_gotndx = M_GOT_MIXED; 1941 sdp->sd_flags |= FLG_SY_SMGOT; 1942 } 1943 break; 1944 } 1945 return (1); 1946 } 1947 1948 plnp = 0; 1949 for (LIST_TRAVERSE(lst, lnp, _gnp)) { 1950 if (_gnp->gn_addend > raddend) 1951 break; 1952 plnp = lnp; 1953 } 1954 1955 /* 1956 * Allocate a new entry. 1957 */ 1958 if ((gnp = libld_calloc(sizeof (Gotndx), 1)) == 0) 1959 return (S_ERROR); 1960 gnp->gn_addend = raddend; 1961 gnp->gn_gotref = gref; 1962 ofl->ofl_gotcnt += gotents; 1963 1964 if (rsp->rel_rtype == R_SPARC_GOT13) { 1965 gnp->gn_gotndx = M_GOT_SMALL; 1966 smlgotcnt += gotents; 1967 sdp->sd_flags |= FLG_SY_SMGOT; 1968 } else { 1969 gnp->gn_gotndx = M_GOT_LARGE; 1970 } 1971 1972 if (gref == GOT_REF_TLSLD) { 1973 ofl->ofl_tlsldgotndx = gnp; 1974 return (1); 1975 } 1976 1977 if (plnp == 0) { 1978 /* 1979 * Insert at head of list 1980 */ 1981 if (list_prependc(lst, (void *)gnp) == 0) 1982 return (S_ERROR); 1983 } else if (_gnp->gn_addend > raddend) { 1984 /* 1985 * Insert in middle of lest 1986 */ 1987 if (list_insertc(lst, (void *)gnp, plnp) == 0) 1988 return (S_ERROR); 1989 } else { 1990 /* 1991 * Append to tail of list 1992 */ 1993 if (list_appendc(lst, (void *)gnp) == 0) 1994 return (S_ERROR); 1995 } 1996 return (1); 1997 } 1998 1999 void 2000 ld_assign_plt_ndx(Sym_desc * sdp, Ofl_desc *ofl) 2001 { 2002 sdp->sd_aux->sa_PLTndx = 1 + ofl->ofl_pltcnt++; 2003 } 2004 2005 2006 uintptr_t 2007 ld_allocate_got(Ofl_desc * ofl) 2008 { 2009 const Sword first_large_ndx = M_GOT_MAXSMALL / 2; 2010 Sym_desc * sdp; 2011 Addr addr; 2012 2013 /* 2014 * Sanity check -- is this going to fit at all? There are two 2015 * limits to be concerned about: 2016 * 1) There is a limit on the number of small pic GOT indices, 2017 * given by M_GOT_MAXSMALL. 2018 * 2) If there are more than (M_GOT_MAXSMALL/2 - M_GOT_XNumber) 2019 * small GOT indices, there will be items at negative 2020 * offsets from _GLOBAL_OFFSET_TABLE_. Items that are 2021 * accessed via large (PIC) code cannot reach these 2022 * negative slots, so mixed mode items must be in the 2023 * non-negative range. This implies a limit of 2024 * (M_GOT_MAXSMALL/2 - M_GOT_XNumber) mixed mode indices. 2025 */ 2026 if (smlgotcnt > M_GOT_MAXSMALL) { 2027 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_SMALLGOT), 2028 EC_WORD(smlgotcnt), M_GOT_MAXSMALL); 2029 return (S_ERROR); 2030 } 2031 if (mixgotcnt > (first_large_ndx - M_GOT_XNumber)) { 2032 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REL_MIXEDGOT), 2033 EC_WORD(mixgotcnt), first_large_ndx - M_GOT_XNumber); 2034 return (S_ERROR); 2035 } 2036 2037 /* 2038 * Set starting offset to be either 0, or a negative index into 2039 * the GOT based on the number of small symbols we've got. 2040 */ 2041 neggotoffset = ((smlgotcnt >= first_large_ndx) ? 2042 (first_large_ndx - smlgotcnt) : 0); 2043 2044 /* 2045 * Initialize the got offsets used by assign_got() to 2046 * locate GOT items: 2047 * small - Starting index of items referenced only 2048 * by small offsets (-Kpic). 2049 * mixed - Starting index of items referenced 2050 * by both large (-KPIC) and small (-Kpic). 2051 * large - Indexes referenced only by large (-KPIC) 2052 * 2053 * Small items can have negative indexes (i.e. lie below 2054 * _GLOBAL_OFFSET_TABLE_). Mixed and large items must have 2055 * non-negative offsets. 2056 */ 2057 small_index = (neggotoffset == 0) ? M_GOT_XNumber : neggotoffset; 2058 large_index = neggotoffset + smlgotcnt; 2059 mixed_index = large_index - mixgotcnt; 2060 2061 /* 2062 * Assign bias to GOT symbols. 2063 */ 2064 addr = -neggotoffset * M_GOT_ENTSIZE; 2065 if (sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL), SYM_NOHASH, 0, ofl)) 2066 sdp->sd_sym->st_value = addr; 2067 if (sdp = ld_sym_find(MSG_ORIG(MSG_SYM_GOFTBL_U), SYM_NOHASH, 0, ofl)) 2068 sdp->sd_sym->st_value = addr; 2069 2070 if (ofl->ofl_tlsldgotndx) { 2071 ofl->ofl_tlsldgotndx->gn_gotndx = large_index; 2072 large_index += 2; 2073 } 2074 return (1); 2075 } 2076 2077 /* 2078 * Initializes .got[0] with the _DYNAMIC symbol value. 2079 */ 2080 uintptr_t 2081 ld_fillin_gotplt(Ofl_desc *ofl) 2082 { 2083 if (ofl->ofl_osgot) { 2084 Sym_desc *sdp; 2085 2086 if ((sdp = ld_sym_find(MSG_ORIG(MSG_SYM_DYNAMIC_U), 2087 SYM_NOHASH, 0, ofl)) != NULL) { 2088 uchar_t *genptr; 2089 2090 genptr = ((uchar_t *)ofl->ofl_osgot->os_outdata->d_buf + 2091 (-neggotoffset * M_GOT_ENTSIZE) + 2092 (M_GOT_XDYNAMIC * M_GOT_ENTSIZE)); 2093 /* LINTED */ 2094 *((Xword *)genptr) = sdp->sd_sym->st_value; 2095 } 2096 } 2097 return (1); 2098 } 2099